CN212646903U - Online calibration device of gas density relay - Google Patents
Online calibration device of gas density relay Download PDFInfo
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- CN212646903U CN212646903U CN202020686057.2U CN202020686057U CN212646903U CN 212646903 U CN212646903 U CN 212646903U CN 202020686057 U CN202020686057 U CN 202020686057U CN 212646903 U CN212646903 U CN 212646903U
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Abstract
The application provides a gas density relay online calibration device, includes: the intelligent control system comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generation unit, an online check contact signal sampling unit and an intelligent control unit; through normally open valve, normally closed valve, the gas pressure lift is realized to the unit that takes place for the air supply, make gas density relay take place the contact signal action, the contact signal action is transmitted to the intelligence through online check-up contact signal sampling unit and is controlled the unit, density value when the intelligence is controlled the unit and is moved according to the contact signal, detect out gas density relay's contact signal action value and/or return value, need not the maintainer to the check-up work that just can accomplish gas density relay to the scene, the reliability of electric wire netting has been improved, the efficiency is improved, the cost is reduced. Meanwhile, in the whole checking process, the gas of the electrical equipment is not needed to be used for checking, and the gas source required by checking is provided through the gas source generating unit, so that the device is environment-friendly, safe and economical.
Description
Technical Field
The utility model relates to an electric power tech field, concretely relates to use gas density relay on-line calibration equipment on high pressure, middling pressure electrical equipment.
Background
The SF6 gas plays a role in arc extinction and insulation in high-voltage electrical equipment, and the safe operation of the SF6 high-voltage electrical equipment is seriously influenced if the density of the SF6 gas in the high-voltage electrical equipment is reduced and the micro water content is exceeded: 1) The reduction of SF6 gas density to some extent will result in loss of insulation and arc extinguishing properties. 2) Under the participation of some metal substances, SF6 gas can generate hydrolysis reaction with water at the high temperature of more than 200 ℃ to generate active HF and SOF2The insulation and metal parts are corroded and generate a large amount of heat, so that the pressure of the gas chamber is increased. 3) When the temperature is reduced, excessive moisture may form condensed water, so that the surface insulation strength of the insulation part is remarkably reduced, and even flashover occurs, thereby causing serious harm. Grid operating regulations therefore mandate that the density and moisture content of SF6 gas must be periodically checked both before and during operation of the equipment.
With the continuous and vigorous development of the intelligent power grid in China, intelligent high-voltage electrical equipment is used as an important component and a key node of an intelligent substation, and plays a significant role in improving the safety of the intelligent power grid. At present, most of high-voltage electrical equipment is SF6 gas insulation equipment, and if the gas density is reduced (caused by leakage and the like), the electrical performance of the equipment is seriously influenced, and serious hidden danger is caused to safe operation. At present, the online monitoring of the gas density value in the SF6 high-voltage electrical equipment is very common, and for this reason, the application of a gas density monitoring system (gas density relay) is developed vigorously. The prior art gas density monitoring systems (gas density relays) are basically: 1) The remote transmission type SF6 gas density relay is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density; 2) the gas density transmitter is used for realizing the acquisition and uploading of density, pressure and temperature and realizing the online monitoring of the gas density. The SF6 gas density relay is the core and key component. However, because the environment for the field operation of the high-voltage substation is severe, especially the electromagnetic interference is very strong, in the currently used gas density monitoring system (gas density relay), the remote transmission type SF6 gas density relay is composed of a mechanical density relay and an electronic remote transmission part; in addition, the traditional mechanical density relay is reserved in a power grid system applying the gas density transmitter. The mechanical density relay is provided with one group, two groups or three groups of mechanical contacts, and can transmit information to a target equipment terminal through a contact connecting circuit in time when pressure reaches an alarm, locking or overpressure state, so that the safe operation of the equipment is ensured. Meanwhile, the monitoring system is also provided with a safe and reliable circuit transmission function, an effective platform is established for realizing real-time data remote data reading and information monitoring, and information such as pressure, temperature, density and the like can be transmitted to target equipment (generally a computer terminal) in time to realize online monitoring.
The periodic inspection of the gas density relay on the electrical equipment is a necessary measure for preventing the trouble in the bud and ensuring the safe and reliable operation of the electrical equipment. The 'electric power preventive test regulations' and the 'twenty-five key requirements for preventing serious accidents in electric power production' both require that the gas density relay be periodically checked. From the actual operation condition, the periodic verification of the gas density relay is one of the necessary means for ensuring the safe and reliable operation of the power equipment. Therefore, the calibration of the gas density relay has been regarded and popularized in the power system, and various power supply companies, power plants and large-scale industrial and mining enterprises have been implemented. And power supply companies, power plants and large-scale industrial and mining enterprises need to be equipped with testers, equipment vehicles and high-value SF6 gas for completing the field verification and detection work of the gas density relay. Including power failure and business loss during detection, the detection cost of each high-voltage switch station, which is allocated every year, is about tens of thousands to tens of thousands yuan. In addition, if the field check of the detection personnel is not standard in operation, potential safety hazards also exist. Therefore, it is necessary to innovate the existing gas density self-checking gas density relay, especially the gas density on-line self-checking gas density relay or system, so that the gas density relay for realizing the on-line gas density monitoring or the monitoring system formed by the gas density relay also has the checking function of the gas density relay, thereby completing the regular checking work of the (mechanical) gas density relay, and simultaneously realizing the checking without using the gas of electrical equipment in the whole checking process, thereby being environment-friendly, safe and economical, and having no need of maintainers to arrive at the site.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an online calibration equipment of gas density relay to solve the problem that provides in the above-mentioned technical background.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an on-line calibration device for a gas density relay, comprising: the intelligent control system comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generation unit, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the multi-way joint;
the multi-way joint is provided with a first interface, a second interface, a third interface and a fourth interface which are communicated with each other, wherein the first interface is connected with the gas density relay;
one end of the normally open valve is provided with an interface communicated with electrical equipment, and the other end of the normally open valve is communicated with a second interface of the multi-way connector; the normally open valve is configured to close or open the gas path of the electrical equipment, and the closing of the gas path of the electrical equipment is completed;
the gas path of the gas source generating unit is communicated with the third interface of the multi-way connector; the gas source generating unit is configured to provide a gas source when the gas density relay is checked on line;
one end of the normally-closed valve is communicated with the fourth interface of the multi-way connector, and the other end of the normally-closed valve is communicated with the atmosphere; the normally-closed valve is configured to close or open an air passage of a gas density relay connected with the multi-way connector, so that the gas density relay generates contact point signal action;
the online checking contact signal sampling unit is connected with the online checking gas density relay and is configured to sample a contact signal of the gas density relay;
the intelligent control unit is respectively connected with the normally open valve, the normally closed valve, the gas density detection sensor and the online check contact signal sampling unit, and is configured to control the normally open valve to be closed or opened, control the normally closed valve to be closed or opened, control pressure value collection and temperature value collection and/or gas density value collection, and detect a contact signal action value and/or a contact signal return value of the gas density relay;
wherein the contact signal comprises an alarm, and/or a latch.
Preferably, the normally open valve or the normally closed valve is an electric valve, an electromagnetic valve, a piezoelectric valve, a temperature-controlled valve, or a novel valve which is made of an intelligent memory material and is opened or closed by electric heating.
Preferably, the normally open valve is in communication with the electrical device through an electrical device connection fitting.
Preferably, one side of the normally open valve close to the electrical device is further provided with a second pressure sensor, and the second pressure sensor is connected with the intelligent control unit and configured to monitor the gas pressure value of the electrical device.
Preferably, the normally closed and/or open valves are sealed within a chamber or housing.
Preferably, the device further comprises a flow controller, wherein the flow controller is communicated with the other end of the normally-closed valve; or the flow controller is arranged between the multi-way joint and the normally-closed valve; the flow controller is configured to control a flow rate of the gas.
Preferably, the gas source generating unit comprises one of a compressor, an air pump, a pressure-generating pump, a booster pump, an electric air pump and an electromagnetic air pump.
Preferably, the device further comprises an air source normally-closed valve, and the air source normally-closed valve is arranged between the multi-way joint and the air source generating unit.
Preferably, the filter element is arranged on an air path connected with a normally open valve, a normally closed valve, a multi-way joint or an air source generating unit.
Preferably, the device further comprises a moisture treatment agent, wherein the moisture treatment agent is arranged on the multi-way joint or the air source generating unit; preferably, the moisture treatment agent includes one of an adsorbent and a desiccant.
Preferably, still include gas leakage warning contact, gas leakage warning contact is established ties or is connected in parallel on the warning contact of the gas density relay that will check up on line, gas leakage warning contact still is connected with the intelligent control unit.
Specifically, within a set time period, the normally open valve is closed under the control of the intelligent control unit, and the intelligent control unit monitors the gas density value P through the gas density detection sensor20The gas density value P is found through calculation processing20The intelligent control unit gradually becomes smaller and sends out air leakage alarm contact signals or/and information through the air leakage alarm contact; or the intelligent control unit monitors the gas pressure value P through the gas density detection sensor, finds that the gas pressure value P is gradually reduced through calculation and processing, and sends a gas leakage alarm contact signal or/and information through the gas leakage alarm contact.
Preferably, the device further comprises a pressure adjusting mechanism, wherein the pressure adjusting mechanism is communicated with the other end of the normally-closed valve; the pressure adjustment mechanism is configured to adjust a pressure rise and fall of the gas.
More preferably, during verification, the pressure adjusting mechanism is a closed air chamber, the closed air chamber is communicated with the normally-closed valve, a heating element and/or a refrigerating element is arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay verified on the line is lifted; or,
the pressure adjusting mechanism is a cavity with an opening at one end, the other end of the cavity is communicated with the normally-closed valve, a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber which is communicated with the normally-closed valve, a piston is arranged in the closed air chamber and is in sealing contact with the inner wall of the closed air chamber, and a driving part is arranged outside the closed air chamber and pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the normally-closed valve; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the normally-closed valve, and the other end of the corrugated pipe stretches under the driving of the driving part;
wherein, the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism and a pneumatic element.
Preferably, the gas density detection sensor is provided on a multi-way joint; or the gas density detection sensor is arranged on a gas density relay for on-line verification.
Preferably, the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.
More preferably, the pressure sensor is mounted on a gas path of an online-check gas density relay.
More preferably, the temperature sensor is installed on or outside the gas path of the gas density relay for on-line verification, or installed in the gas density relay for on-line verification, or installed outside the gas density relay for on-line verification.
More preferably, the temperature sensor may be a thermocouple, a thermistor, a semiconductor type; can be a contact type and a non-contact type; can be a thermal resistor and a thermocouple.
More preferably, at least one temperature sensor is arranged near or on or integrated in a temperature compensation element of the gas density relay for online verification; preferably, at least one temperature sensor is arranged at one end of the pressure detector of the gas density relay checked on line, which is close to the temperature compensation element.
More preferably, the pressure sensor includes, but is not limited to, a relative pressure sensor, and/or an absolute pressure sensor.
Further, when the pressure sensor is an absolute pressure sensor, the absolute pressure value is used for representing the pressure sensor, the calibration result is the corresponding absolute pressure value at 20 ℃, the relative pressure value is used for representing the calibration result, and the calibration result is converted into the corresponding relative pressure value at 20 ℃;
when the pressure sensor is a relative pressure sensor, the relative pressure value is used for representing, the verification result is the corresponding relative pressure value at 20 ℃, the absolute pressure value is used for representing, and the verification result is converted into the corresponding absolute pressure value at 20 ℃;
the conversion relation between the absolute pressure value and the relative pressure value is as follows:
Pabsolute pressure＝PRelative pressure+PStandard atmospheric pressure。
Further, the pressure sensor may also be a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure sensor with an induction coil in the bawden tube), a resistive pressure sensor (e.g., a pressure sensor with a slide wire resistor in the bawden tube); the pressure sensor can be an analog pressure sensor or a digital pressure sensor.
Preferably, the online verification contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a normally open valve or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from a contact signal of the gas density relay on a circuit through an isolation sampling element; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay through an isolation sampling element, and connects the contact of the gas density relay with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a microswitch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
More preferably, the online verification contact signal sampling unit comprises a first connection circuit and a second connection circuit, the first connection circuit is connected with the contact of the gas density relay and the contact signal control loop, and the second connection circuit is connected with the contact of the gas density relay and the intelligent control unit; in a non-verification state, the second connection circuit is opened, and the first connection circuit is closed; under the check-up state, online check-up contact signal sampling unit cuts off first connecting circuit, intercommunication second connecting circuit will gas density relay's contact with the intelligence is controlled the unit and is connected.
Preferably, the online check joint signal sampling unit and the intelligent control unit are arranged together.
More preferably, the online verification contact signal sampling unit and the intelligent control unit are sealed in a cavity or a shell.
Preferably, the online verification contact signal sampling unit samples contact signals of the online verified gas density relay, and the sampling requirements are as follows:
the online check joint signal sampling unit is provided with at least one group of independent sampling joints, can automatically complete check on at least one joint simultaneously, and continuously measures without changing the joint or reselecting the joint; wherein,
the contacts include, but are not limited to, one of an alarm contact, an alarm contact + latching 1 contact + latching 2 contact, an alarm contact + latching contact + overpressure contact.
Preferably, the online verification contact signal sampling unit is used for testing the contact signal action value or the switching value of the contact signal action value of the online verified gas density relay to be not lower than 24V, namely, during verification, a voltage of not lower than 24V is applied between corresponding terminals of the contact signal.
Preferably, the gas density relay further comprises a gas density relay, wherein the gas density relay comprises a shell, and a base, a pressure detector, a temperature compensation element and at least one signal generator which are arranged in the shell; the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
More preferably, the gas density detection sensor is provided on a multi-way joint; alternatively, the gas density detection sensor is provided on the gas density relay.
More preferably, the gas density relay and the gas density detection sensor are of an integrated structure; or the gas density relay and the gas density detection sensor are a remote transmission type gas density relay with an integrated structure.
More preferably, the online check contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor; or the intelligent control unit acquires the pressure value and the temperature value acquired by the gas density detection sensor, and the online monitoring of the gas density of the monitored electrical equipment is completed.
More preferably, the intelligent control unit calculates the gas density value by using an average method (averaging method), wherein the average method is as follows: setting acquisition frequency in a set time interval, and carrying out average value calculation processing on N gas density values of different acquired time points to obtain the gas density values; or setting a temperature interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different temperature values acquired in the whole temperature range to obtain a gas density value; or setting a pressure interval step length in a set time interval, and carrying out average value calculation processing on density values corresponding to N different pressure values acquired in the whole pressure variation range to obtain a gas density value; wherein N is a positive integer greater than or equal to 1.
Preferably, the intelligent control unit acquires a gas density value acquired by the gas density detection sensor when the gas density relay to be verified on line performs contact signal action or switching, so as to complete online verification of the gas density relay; or, the intelligence accuse unit acquires the gas density relay of the online check-up of wanting when taking place contact signal action or switching the pressure value and the temperature value that gas density detection sensor gathered to according to the pressure value that gas pressure-temperature characteristic conversion becomes corresponding 20 ℃, gas density value promptly, accomplish the online check-up of gas density relay.
Preferably, the intelligent control unit acquires the gas density value P acquired by the gas density detection sensor20If the gas density value P20The intelligent control unit controls and opens the normally closed valve when the pressure is not lower than the preset threshold value, and simultaneously sends an abnormal signal and/or information of over-high pressure; or,
the unit is controlled to the intelligence acquires the gas pressure value P that gas density detection sensor gathered, if pressure value P is greater than or equal to the preset threshold value, the unit control is controlled and open normally closed valve to the intelligence, and simultaneously, the unit is controlled to the intelligence sends the too high abnormal signal of pressure and/or information.
Preferably, the intelligent control unit automatically controls the whole verification process based on an embedded algorithm and a control program of an embedded system of the microprocessor, and comprises all peripherals, logic and input and output.
More preferably, the intelligent control unit automatically controls the whole verification process based on embedded algorithms and control programs such as a general-purpose computer, an industrial personal computer, an ARM chip, an AI chip, a CPU, an MCU, an FPGA, a PLC and the like, an industrial control main board, an embedded main control board and the like, and includes all peripherals, logics, input and output.
Preferably, the intelligent control unit is provided with an electrical interface, and the electrical interface completes test data storage, and/or test data export, and/or test data printing, and/or data communication with an upper computer, and/or analog quantity and digital quantity information input.
Preferably, the intelligent control unit further comprises a communication module for transmitting the test data and/or the verification result in a long distance.
More preferably, the communication mode of the communication module is a wired communication mode or a wireless communication mode.
Further, the wired communication mode includes, but is not limited to, one or more of an RS232 BUS, an RS485 BUS, a CAN-BUS BUS, 4-20mA, Hart, IIC, SPI, Wire, a coaxial cable, a PLC power carrier and a cable.
Further, the wireless communication mode includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication and sonar.
Preferably, a clock is further arranged on the intelligent control unit, and the clock is configured to be used for regularly setting the verification time of the gas density relay, or recording the test time, or recording the event time.
Preferably, the control of the intelligent control unit is controlled through a field control and/or a background control.
More preferably, the online calibration device for the gas density relay completes online calibration of the online-calibrated gas density relay according to the setting or the instruction of the background; or, completing the online verification of the online verified gas density relay according to the set verification time of the gas density relay.
More preferably, the gas circuit of the normally-closed valve is communicated with the online verified gas density relay through the first connecting pipe; and a first interface of the multi-way connector is communicated to the part of the first connecting pipe between the gas density relay for on-line verification and the normally-closed valve.
Preferably, the electric equipment further comprises a self-sealing valve, wherein the self-sealing valve is arranged between the electric equipment and the normally open valve; alternatively, the normally open valve is installed between the electrical device and the self-sealing valve.
Preferably, the air supply device further comprises an air supply interface, wherein the air supply interface is arranged on the electrical equipment; or the air supply interface is arranged between the electrical equipment and the normally open valve; or the air supplementing interface is arranged on a second connecting pipe, and the second connecting pipe is communicated with the normally open valve and the air passage of the multi-way connector, or the second connecting pipe is communicated with the normally open valve and the gas density relay for online verification.
Preferably, the intelligent control system further comprises a display interface for human-computer interaction, the display interface is connected with the intelligent control unit, current verification data is displayed in real time, and/or data input is supported.
Preferably, the intelligent control unit further comprises a contact resistance detection unit, and the contact resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the online checking gas density relay is isolated from a control loop of the online checking gas density relay, and when the contact signal of the online checking gas density relay acts and/or receives an instruction of detecting contact resistance of the contact, the contact resistance detection unit can detect the contact resistance value of the contact of the online checking gas density relay.
Preferably, the intelligent control unit further comprises an insulation resistance detection unit, and the insulation resistance detection unit is connected with the contact signal or directly connected with the signal generator; under the control of the online checking contact signal sampling unit, the contact signal of the online checking gas density relay is isolated from a control loop of the online checking gas density relay, and when the contact signal of the online checking gas density relay acts and/or receives an instruction for detecting the contact insulation resistance, the insulation resistance detecting unit can detect the contact insulation resistance value of the online checking gas density relay.
Preferably, the gas density relay to be verified online includes, but is not limited to, a bimetal compensated gas density relay, a gas compensated gas density relay, a bimetal and gas compensated hybrid gas density relay; a fully mechanical gas density relay, a digital gas density relay, a mechanical and digital combined gas density relay; the gas density relay with pointer display, the digital display type gas density relay and the gas density switch without display or indication; SF6 gas density relay, SF6 mixed gas density relay, N2 gas density relay.
Preferably, the electrical equipment comprises SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment.
Specifically, the electrical equipment comprises a GIS, a GIL, a PASS, a circuit breaker, a current transformer, a voltage transformer, a transformer, an inflatable cabinet and a ring main unit.
Preferably, still include little water sensor, little water sensor respectively with lead to connect with the many ways with the unit is controlled to the intelligence is connected.
More preferably, still include gas circulation mechanism, gas circulation mechanism respectively with the gas density relay of online verification with the unit is controlled to the intelligence is connected, gas circulation mechanism includes capillary, sealed chamber and heating element.
Further, the micro water sensor can be installed in a sealed chamber of the gas circulation mechanism, in a capillary, at a capillary port, and outside the capillary.
Preferably, the intelligent control system further comprises a decomposition product sensor, and the decomposition product sensor is respectively connected with the multi-way connector and the intelligent control unit.
Preferably, the online gas density relay checking device further comprises a camera for monitoring.
Compared with the prior art, the technical scheme of the utility model following beneficial effect has:
the application provides a gas density relay online calibration device for high pressure, middling pressure electrical equipment, including gas density detection sensor, normally open valve, normally closed valve, lead to joint, air supply generation unit, online calibration contact signal sampling unit and intelligence accuse unit more. Through normally open valve, normally closed valve, the unit realization gas pressure's lift is taken place to the air supply, make gas density relay take place the contact signal action, the contact signal action transmits the intelligence through online check-up contact signal sampling unit and controls the unit, density value when the intelligence is controlled the unit and is moved according to the contact signal, detect out gas density relay's warning and/or shutting contact signal action value and/or return value, need not maintainer to the check-up work that just can accomplish gas density relay to the scene, realize non-maintaining, the reliability of electric wire netting has been improved greatly, and the work efficiency is improved, and the operation maintenance cost is reduced. This application is at whole verification process, through the required air supply of air supply generating unit provide the check-up, and need not to use electrical equipment's SF6 gas to verify, not only environmental protection but also safe economy, especially this application can also realize pressure sensor's zero-bit check-up diagnosis to and when monitoring pressure too high, can prevent the serious problem that pressure too high leads to appearing through release pressure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an online checking device of a gas density relay according to a first embodiment;
FIG. 2 is a schematic circuit control diagram of the gas density relay on-line verification apparatus according to the first embodiment;
FIG. 3 is a schematic structural diagram of an online calibration device for a gas density relay according to a second embodiment;
FIG. 4 is a schematic structural diagram of an online calibration device of a gas density relay according to a third embodiment;
FIG. 5 is a schematic structural diagram of an online calibration device of a gas density relay according to a fourth embodiment;
FIG. 6 is a schematic structural diagram of an online calibration device of a gas density relay according to a fifth embodiment;
fig. 7 is a schematic structural diagram of an online calibration device for a gas density relay according to a sixth embodiment.
Illustration of the drawings:
1. a gas density relay to be checked online; 2. a pressure sensor; 3. a temperature sensor; 4. a normally open valve; 41. a normally open valve sealing housing; 42. a normally open valve lead wire seal; 5. a gas source generating unit; 501. A gas source sealing shell; 502. a gas source lead wire sealing member; 6. an online check contact signal sampling unit; 7. an intelligent control unit; 8. an electrical device; 9. a multi-way joint; 901. a first interface of the multi-way joint; 902. a second interface of the multi-way joint; 903. a third interface of the multi-way joint; 904. a fourth interface of the multi-way joint; 905. a fifth interface of the multi-way joint; 10. a gas source normally closed valve; 101. the air source normally-closed valve seals the shell; 102. the leading-out wire sealing element of the air source normally-closed valve; 11. normally closing the valve; 1101. a normally closed valve seal housing; 1102. a normally closed valve lead wire seal; 12. a flow controller; 1201. a flow controller seal housing; 1202. a flow controller outlet wire seal; 13. a pressure adjusting mechanism; 1301. a pressure adjustment mechanism housing; 1302. a cavity; 1303. A piston; 1304. a drive member; 1305. adjusting a rod; 1306. a seal member; 1307. an air bag; 1308. A push rod; 14. a filter member; 15. a moisture treating agent; 16. a second filter element.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The first embodiment is as follows:
as shown in fig. 1, an online calibration device for a gas density relay includes: pressure sensor 2, temperature sensor 3, normally open valve 4, air supply generating unit 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many-way joint 9, normally closed valve 11, flow controller 12, filter piece 14, moisture treating agent 15. The multi-way joint 9 is provided with a first interface 901, a second interface 902, a third interface 903, a fourth interface 904 and a fifth interface 905 which are communicated with each other. The pressure sensor 2 of the gas density detection sensor is communicated with the fifth interface 905 of the multi-way joint 9. The gas path of the gas density relay 1 to be verified is communicated with the first interface 901 of the multi-way joint 9. One end of the normally open valve 4 is provided with an interface communicated with the electrical equipment 8, the other end of the normally open valve 4 is communicated with the second interface 902 of the multi-way connector 9, and the normally open valve 4 is configured to close or open the air path of the electrical equipment 8, so as to complete the closing of the air path of the electrical equipment 8. The air passage of the air source generating unit 5 is communicated with the third interface 903 of the multi-passage joint 9 through a filter element 14, and the air source generating unit 5 is configured to provide an air source when the gas density relay 1 is verified on line. One end of the normally-closed valve 11 is connected with one end of a flow controller 12, the other end of the flow controller 12 is communicated with the fourth interface 904 of the multi-way connector 9, the other end of the normally-closed valve 11 is communicated with the atmosphere, and the normally-closed valve 11 is configured to close or open the air path of the gas density relay 1 to be verified, which is connected with the multi-way connector 9, so that the gas density relay 1 to be verified generates a contact signal action. The online verification contact signal sampling unit 6 is connected with the gas density relay 1 to be verified and the intelligent control unit 7, and is configured to sample the contact signal of the gas density relay 1 to be verified. Intelligence accuse unit 7, respectively with normally open valve 4, normally closed valve 11, gas density detection sensor (pressure sensor 2, temperature sensor 3), flow controller 12 (can online control regulation flow, or set for need not adjust flow) with online check contact signal sampling unit 6 is connected, is configured to control closing or opening of normally open valve 4, control closing or opening of normally closed valve 11, pressure value collection and temperature value collection and/or gas density value collection to and detect contact signal action value and/or contact signal return value when the contact of the gas density relay 1 of online check takes place the action. In this case, the air source generating unit 5 is one of an air compressor (compressor), an air pump, a pressure-generating pump, a booster pump, an electric air pump, or an electromagnetic air pump. In the above embodiment, the normally open valve 4 and the normally closed valve 11 may be various, and a shut-off valve, such as a ball valve, a butterfly valve, a gate valve, a stop valve, a plug valve, a butterfly valve, a needle valve, or a diaphragm valve, may be used. If the ball valve is used, the rotating self-sealing valve core can drive the ball valve to close the air passage of the switch device, and the ball valve can be flexibly designed according to actual needs. The normally open valve 4 and the normally closed valve 11 are automatic, and can be verified manually or semi-manually. For better sealing, the air source generating unit 5 is sealed in an air source sealing shell 501 and is connected with the intelligent control unit 7 through an air source outgoing line sealing piece 502; the flow controller 12 is sealed inside the flow controller sealing case 1201, and is connected to the intelligent control unit 7 through the flow controller lead wire sealing member 1202. The manifold 9 is also provided with a moisture treatment agent 15.
The checking and monitoring working principle of the gas density relay on-line checking device of the embodiment is as follows:
as shown in fig. 1 and fig. 2, during the normal working condition, the normally open valve 4 of the online calibration device is in the open state, the normally closed valve 11 is in the closed state, the gas source generating unit 5 is in the non-working mode, the online gas density value of the calibrated gas density relay 1 in the electrical equipment 8 is monitored, and meanwhile, the online calibration device monitors the gas density value of the calibrated gas density in the electrical equipment 8 through the gas density detecting sensor and the intelligent control unit 7. The intelligent control unit 7 monitors the gas pressure and temperature of the electrical equipment 8 according to the pressure sensor 2 and the temperature sensor 3 to obtain a corresponding 20 ℃ pressure value P20(i.e., gas density value).
When it is necessary to verify the gas density relay 1, if the gas density value P is present20Not less than set safety check density value PSThe online checking device or the background sends an instruction, the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and the online checking contact signal sampling unit 6 cuts off the contact signal control of the gas density relay 1 in the checking stateAnd a control loop for connecting the contact of the gas density relay 1 to the intelligent control unit 7. Combine fig. 2 to show, close normally open valve 4 through intelligence accuse unit 7, the unit 5 takes place for the unit 5 is controlled to the rethread intelligence accuse unit 7, makes the air supply takes place for unit 5 and opens mode, provides the required air supply of online check-up. When the gas pressure of the gas source reaches a preset threshold value, the intelligent control unit 7 controls the gas source generating unit 5 to enable the gas source generating unit 5 to be in a stop working mode. Then, open normally closed valve 11 through intelligence accuse unit 7 to control flow controller 12, make gas pressure slowly descend, make the gas density relay 1 of online check-up take place the contact signal action, the contact signal action transmits to intelligence accuse unit 7 through online check-up contact signal sampling unit 6, pressure value, the temperature value that the intelligence accuse unit 7 surveyed when according to the contact signal action convert into according to the gas characteristic and correspond pressure value P when 20 ℃ into20That is, the gas density value, or the contact signal operation value P of the gas density relay 1 verified on line by directly obtaining the gas density valueD20And the checking work of the contact signal action value of the gas density relay 1 is completed.
After the contact action values of the alarm and/or locking signals of the gas density relay 1 are all detected, the normally closed valve 11 is closed through the intelligent control unit 7, and the air source generating unit 5 is controlled through the intelligent control unit 7, so that the air source generating unit 5 starts the working mode to slowly increase the air pressure, so that the online verified gas density relay 1 generates contact signal reset, the contact signal reset is transmitted to the intelligent control unit 7 through the online verified contact signal sampling unit 6, the intelligent control unit 7 obtains a gas density value according to a pressure value and a temperature value when the contact signal is reset, or directly obtaining the gas density value, detecting the return value of the alarm and/or locking contact signal of the gas density relay 1 verified on line, and completing the verification work of the contact signal return value of the gas density relay 1 verified on line. The verification is repeated for a plurality of times (for example, 2 to 3 times), and then the average value is calculated, so that the verification work of the gas density relay 1 is completed.
Then, the intelligent control unit 7 is controlled to resume running to a normal working state: the gas source generating unit 5 is in a stop working mode; the normally-closed valve 11 is in a closed state; the normally open valve 4 is opened through the intelligent control unit 7, so that the gas density relay 1 is communicated with the electrical equipment 8 on a gas path; meanwhile, the intelligent control unit 7 adjusts the online checking contact signal sampling unit 6 to be in a working state, the contact signal control loop of the online checked gas density relay 1 recovers to run to a normal working state, the density monitoring loop of the gas density relay 1 works normally, and the gas density of the gas density relay 1 safely monitors the gas density of the electrical equipment 8, so that the gas equipment 8 works safely and reliably. Therefore, the online checking work of the gas density relay 1 can be conveniently completed, and the safe operation of the electrical equipment can not be influenced when the gas density relay 1 is checked online.
Because the gas density relay 1 has already performed the gas density value P before the start of the calibration20Not less than set safety check density value PSThe gas of the electrical equipment 8 is in a safe operation range, and the gas leakage is a slow process and is safe during verification.
As shown in fig. 2, the online verification device further includes an air leakage alarm contact 17. Within a set time period, for example 2h (hours), the normally open valve 4 is closed under the control of the intelligent control unit 7, and the intelligent control unit 7 monitors the gas density value P through the gas density detection sensors (the pressure sensor 2 and the temperature sensor 3)20And when the gas density value is found to be gradually reduced through calculation and processing, the intelligent control unit 7 sends out a gas leakage alarm contact signal or/and information, and meanwhile, the intelligent control unit 7 uploads the gas leakage alarm contact signal or/and information to a background. The gas leakage alarm contact 17 is connected in parallel to an alarm contact (when the density is normal, the contact is a normally open type gas density relay) of the gas density relay 1 checked on the line; alternatively, the leakage alarm contact 17 is connected in series to an alarm contact (when the density is normal, the contact is a normally closed gas density relay) of the gas density relay 1 in the on-line verification. By way of example, the leakage alarm contact 17 is connected in parallel to an alarm contact PJ of a gas density relay (for normal density, the contact is a normally open gas density relay) checked on the line, and on a certain day, the leakage alarm contact is connected in parallel to the alarm contact PJ of the gas density relay8 o 'clock morning, the online calibration equipment of gas density relay closes normally open valve 4 under its intelligence control unit 7's control, then intelligence control unit 7 detects gas density value P that sensor (pressure sensor 2, temperature sensor 3) monitored through gas density20Is 0.622 MPa. After one hour, namely 9 o' clock in the morning, the intelligent control unit 7 monitors the gas density value P through the gas density detection sensors (the pressure sensor 2 and the temperature sensor 3)20For 0.612MPa, the unit 7 is controlled to intelligence through calculation and processing discovers that gas density value has diminished 0.01MPa in an hour, and the change of gas density value has surpassed preset threshold value, and the unit 7 is controlled to intelligence just drives gas leakage warning contact 17 closed (this case is closed, also can break off), and then sends gas leakage warning contact signal or/and information to pass through the unit 7 teletransmission backstage to gas leakage information of the online verifying attachment of gas density relay simultaneously, then, open normally open valve 4 again under the control of unit 7 is controlled to intelligence. Therefore, the gas density relay online calibration device has a gas leakage self-diagnosis function, and can find the gas leakage problem in time, so that the gas density relay online calibration device can be more suitable for field application, and the power grid is more reliable and safer. In addition, the intelligent control unit 7 can find that the gas pressure value is gradually reduced through calculation processing according to the gas pressure value P monitored by the gas density detection sensor, and the intelligent control unit 7 sends out a gas leakage alarm contact signal or/and information.
When check-up gas density relay (or during pressure sensor zero-bit check), unit 7 is controlled to the intelligence when confirming normally open valve 4 is in the closed condition, and this moment (or through) unit 7 has been controlled to the check-up state to online check-up contact signal sampling unit 6 adjustment to the intelligence, and promptly under the check-up state, unit 7 control is controlled and open normally closed valve 11 to the intelligence, when making the gas pressure of the gas circuit of many-way articulate slowly drop to the zero-bit, this moment unit 7 is controlled to the intelligence receives pressure signal P that pressure sensor 2 gathered0If the pressure difference | P0And-0 | ≧ a preset threshold value, the intelligent control unit 7 sends a signal and/or information of the pressure sensor zero offset abnormality.
The intelligent control unit 7 acquires the gas density value P acquired by the gas density detection sensor20If the density value P20The intelligent control unit 7 controls and opens the normally closed valve 11 to reduce the gas pressure, so that serious accidents such as explosion and the like caused by overhigh pressure of the electrical equipment 8 are prevented, and the intelligent control unit 7 sends an overhigh pressure abnormal signal and/or information; for example, the intelligent control unit 7 can transmit the abnormal signal with over-high pressure to the background through the alarm signal loop of the density relay, so that the operation and maintenance personnel can know the abnormal signal and can timely handle the problem and prevent the problem from being enlarged. Or, unit 7 is controlled to intelligence acquires the gas pressure value P that gas density detection sensor gathered, if pressure value P is greater than or equal to the default threshold value, unit 7 control is controlled to intelligence and open normally closed valve 11, makes gas pressure descend, prevents serious accidents such as electric equipment 8 explosion from appearing, and unit 7 is controlled to intelligence sends out too high abnormal signal of pressure and/or information, makes fortune dimension personnel in time discover the accident and handle the accident, ensures the electric wire netting safe and reliable operation.
In this embodiment, the multi-way joint 9 is further provided with a moisture treatment agent 15, the moisture treatment agent 15 is disposed in the cavity of the multi-way joint 9, and preferably, the moisture treatment agent 15 is selected from one of an adsorbent and a desiccant. For example, an alumina molecular sieve (also called as an activated alumina desiccant) can be adopted, so that the moisture of the online checking device is very small, and the moisture of the electrical equipment 8 is ensured not to be increased or exceed the standard in the online checking process, but also to be reduced. The design principle of the moisture treatment agent 15 is that the moisture treatment agent 15 is convenient to replace on site, a cavity (a hole with a proper size) can be arranged on the multi-way connector 9, then the moisture treatment agent 15 is fixed on a closed connector, and the moisture treatment agent 15 is fixed in the cavity of the multi-way connector 9 through the closed connector, so that timely replacement in a certain period can be realized. In this embodiment, the air path of the air source generating unit 5 is communicated with the third interface 903 of the multi-way connector 9 through a filtering member 14, and the filtering member 14 may be one of a filter screen, a filter element, and a filter. In the case, the filter screen is adopted, so that the gas of the electrical equipment 8 is prevented from being polluted in the online checking process, and the safe and reliable operation of the electrical equipment 8 is ensured.
The types of pressure sensors 2 described above include absolute pressure sensors, relative pressure sensors, or absolute pressure sensors and relative pressure sensors, and the number may be several. The pressure sensor can be in the form of a diffused silicon pressure sensor, a MEMS pressure sensor, a chip pressure sensor, a coil-induced pressure sensor (e.g., a pressure measurement sensor with induction coil attached to a bawden tube), or a resistive pressure sensor (e.g., a pressure measurement sensor with slide wire resistance attached to a bawden tube). The pressure sensor can be an analog pressure sensor or a digital pressure sensor. The pressure sensor is a pressure sensor, a pressure transmitter, and other pressure-sensitive elements, such as diffused silicon, sapphire, piezoelectric, and strain gauge (resistance strain gauge, ceramic strain gauge).
The temperature sensor 3 may be a thermocouple, a thermistor, or a semiconductor type; can be a contact type and a non-contact type; can be a thermal resistor and a thermocouple. In short, the temperature acquisition can be realized by various temperature sensing elements such as a temperature sensor, a temperature transmitter and the like.
The online check contact signal sampling unit 6 mainly completes contact signal sampling of the gas density relay 1. Namely, the basic requirements or functions of the online verification contact signal sampling unit 6 are as follows: 1) the safe operation of the electrical equipment is not influenced during the verification, namely the safe operation of the electrical equipment is not influenced when the contact signal of the gas density relay 1 acts during the verification; 2) the contact signal control loop of the gas density relay 1 does not influence the performance of the gas density relay, particularly does not influence the performance of the intelligent control unit 7, and does not cause the gas density relay to be damaged or influence the test work.
The basic requirements or functions of the above-mentioned intelligent control unit 7 are: the control and signal acquisition of the normally open valve 4, the normally closed valve 11, the air source generating unit 5 and the flow controller 12 are completed through the intelligent control unit 7. The realization is as follows: the pressure value and the temperature value when the contact signal of the gas density relay 1 is detected to act can be converted into the corresponding pressure value P at 20 DEG C20(density value), that is, contact operating value P of gas density relay 1 can be detectedD20And the checking work of the gas density relay 1 is completed. Alternatively, the gas density can be directly detectedDensity value P of electric appliance 1 when contact signal is actuatedD20And the checking work of the gas density relay 1 is completed. Meanwhile, the self-checking work among the gas density relay 1, the pressure sensor 2 and the temperature sensor 3 can be completed through the test of the rated pressure value of the gas density relay 1, and the maintenance-free operation is realized. Of course, the intelligent control unit 7 can also realize: completing test data storage; and/or test data derivation; and/or the test data may be printed; and/or can be in data communication with an upper computer; and/or analog quantity and digital quantity information can be input. The intelligent control unit 7 further comprises a communication module, and the information such as test data and/or verification results is transmitted in a long distance through the communication module; when the rated pressure value of the gas density relay 1 outputs a signal, the intelligent control unit 7 simultaneously collects the current density value, and the calibration of the rated pressure value of the gas density relay 1 is completed.
Electrical equipment including SF6 gas electrical equipment, SF6 mixed gas electrical equipment, environmentally friendly gas electrical equipment, or other insulated gas electrical equipment. Specifically, the electrical equipment includes GIS, GIL, PASS, circuit breakers, current transformers, voltage transformers, gas insulated cabinets, ring main units, and the like.
The gas density detection sensor, the normally open valve 4, the normally closed valve 11, the gas source generation unit 5, the flow controller 12, the online check contact signal sampling unit 6 and the intelligent control unit 7 can be flexibly arranged as required. For example, the pressure sensor 2 and the temperature sensor 3 may be provided together; the pressure sensor 2, the temperature sensor 3, the online check joint signal sampling unit 6 and the intelligent control unit 7 can be arranged together. In short, the arrangement between them can be flexibly arranged and combined.
After the gas density relay 1 completes the checking work, the on-line checking device judges and can inform the detection result. The mode is flexible, and particularly can be as follows: 1) the online verification device may be annunciated locally, such as by indicator lights, digital or liquid crystal displays, etc.; 2) or the online checking device can upload the data in an online remote transmission communication mode, for example, the data can be uploaded to a background of an online monitoring system; 3) or uploading the data to a specific terminal through wireless uploading, for example, a mobile phone can be uploaded wirelessly; 4) or uploaded by another route; 5) or the abnormal result is uploaded through an alarm signal line or a special signal line; 6) uploading alone or in combination with other signals. In a word, after the online verification device completes the online verification work of the gas density relay, if an abnormality occurs, an alarm can be automatically sent out, and the alarm can be uploaded to a remote end or can be sent to a designated receiver, for example, a mobile phone. Or, after the online calibration device completes the calibration work of the gas density relay, if the online calibration device is abnormal, the intelligent control unit 7 can upload the alarm contact signal of the gas density relay 1 to a remote end (a monitoring room, a background monitoring platform and the like) and can display the notice on site. The simple gas density relay is used for on-line calibration, and the result of abnormal calibration can be uploaded through an alarm signal line. The alarm signal can be uploaded according to a certain rule, for example, when the alarm signal is abnormal, a contact is connected in parallel with an alarm signal contact and is regularly closed and opened, and the condition can be obtained through analysis; or through a separate verification signal line. The intelligent mobile phone can be uploaded in good state or in problem, or can be uploaded through remote density on-line monitoring, or can upload a verification result through a single verification signal line, or can be uploaded through on-site display, on-site alarm or wireless uploading and can be uploaded through the internet with the intelligent mobile phone. The communication mode is wired or wireless, and the wired communication mode CAN be industrial buses such as RS232, RS485, CAN-BUS and the like, optical fiber Ethernet, 4-20mA, Hart, IIC, SPI, Wire, coaxial cables, PLC power carrier and the like; the wireless communication mode can be 2G/3G/4G/5G, WIFI, Bluetooth, Lora, Lorawan, Zigbee, infrared, ultrasonic wave, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module with a built-in sensor (such as NB-IOT) and the like. In a word, the reliable performance of the gas density relay can be fully ensured in multiple modes and various combinations.
The on-line checking device has a safety protection function, and particularly, when the on-line checking device is lower than a set value, the on-line checking device automatically does not check the density relay on line any more and sends out a notification signal. For example, when the gas density value of the electrical equipment is less than the set value PSIn time, no on-line verification is performed, only if the electrical equipmentAnd when the gas density value is more than or equal to (the alarm pressure value is plus 0.02MPa), the online verification can be carried out.
The online checking device can check repeatedly for multiple times (for example, 2-3 times), and the average value of the checking device is calculated according to the checking result of each time. When necessary, the gas density relay can be checked on line at any time.
Meanwhile, the online checking device can also monitor the gas density value, and/or the pressure value, and/or the temperature value of the electrical equipment on line, and upload the gas density value, and/or the pressure value, and/or the temperature value to the target equipment to realize online monitoring.
Example two:
as shown in fig. 3, an online calibration device for a gas density relay includes: pressure sensor 2, temperature sensor 3, normally open valve 4, air supply generating unit 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many-way joint 9, air supply normally closed valve 10, normally closed valve 11, flow controller 12, filter 14, moisture treatment agent 15. The difference of this embodiment from the first embodiment is: an air source normally-closed valve 10 and a filter element 14 are additionally arranged between the air source generating unit 5 and the multi-way connector 9, the air source normally-closed valve 10 is sealed in an air source normally-closed valve sealing shell 101, and the air source normally-closed valve outgoing line sealing element 102 is connected with the intelligent control unit 7; the normally open valve 4 is sealed in the normally open valve sealing shell 41 and is connected with the intelligent control unit 7 through a normally open valve outgoing line sealing piece 42; the normally-closed valve 11 is sealed in a normally-closed valve sealing housing 1101 and is connected with the intelligent control unit 7 through a normally-closed valve lead wire sealing member 1102.
The working principle of the verification and monitoring of the embodiment is as follows: referring to the first embodiment, in a normal working state, the normally open valve 4 of the online calibration device is in an open state, the normally closed valve 11 is in a closed state, and the online calibration device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) and the intelligent control unit 7; the gas density relay 1 verified on-line monitors the gas density value inside the electrical equipment 8. The online checking device is used for checking the gas density relay according to a set checking time or/and a checking instruction and the gas density value condition under the condition that the gas density relay is allowed to be checked: the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online checking contact signal sampling unit 6 cuts off a contact signal control loop of the online checked gas density relay 1 and connects the contact of the online checked gas density relay 1 to the intelligent control unit; the normally open valve 4 is closed through the intelligent control unit 7; the air source normally-closed valve 10 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the air source generating unit 5 again, the air source generating unit 5 is enabled to be in a working mode, an air source required by online verification is provided, when the air pressure of the air source reaches a preset threshold value, the intelligent control unit 7 closes the air source normally-closed valve 10, and the intelligent control unit 7 controls the air source generating unit 5 again, so that the air source generating unit 5 is in a working stop mode; then, open normally closed valve 11 through intelligence accuse unit 7, owing to there has been the effect of flow controller 12 (also can set up in the left side of normally closed valve 11), make gas pressure slowly descend, make the gas density relay 1 of online check-up take place the contact signal action, the contact signal action passes through online check-up contact signal sampling unit 6 and transmits intelligence accuse unit 7, intelligence accuse unit 7 obtains the gas density value according to the pressure value when the contact signal action, the temperature value, or directly obtains the gas density value, detect out the contact signal action value of the gas density relay 1 of online check-up, accomplish the check-up work of the contact signal action value of gas density relay 1. Then, control unit 7 through the intelligence and close normally closed valve 11, the unit 7 is controlled to the rethread intelligence and open air supply normally closed valve 10, the unit 7 is controlled again to the intelligence accuse air supply and takes place unit 5, make the air supply takes place unit 5 and opens the mode, make gas pressure rise slowly, make the gas density relay 1 that the online institute verified take place the contact signal and reset, the contact signal resets and transmits the intelligence through online check-up contact signal sampling unit 6 and controls unit 7, pressure value when the intelligence accuse unit 7 resets according to the contact signal, the temperature value obtains the gas density value, or directly obtains the gas density value, detect out the contact signal return value of the gas density relay 1 that the online institute verified, accomplish the check-up work of the contact signal return value of the gas density relay 1 that the online institute verified. After all contact signal check-up work is accomplished, resume operation to normal operating condition through the control of intelligent control unit 7: the air source generating unit 5 is in a stop working mode, the air source normally-closed valve 10 and the normally-closed valve 11 are both in a closed state, and the normally-opened valve 4 is in an open state; meanwhile, the intelligent control unit 7 adjusts the online checking contact signal sampling unit 6 to be in a working state, and a contact signal control loop of the online checked gas density relay 1 recovers to run to be in a normal working state.
Example three:
as shown in fig. 4, an online calibration device for a gas density relay includes: gas density relay 1, pressure sensor 2, temperature sensor 3, normally open valve 4, air supply generating unit 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many joints 9, air supply normally closed valve 10, normally closed valve 11, flow controller 12, filter piece 14, moisture treatment agent 15, second filter piece 16. The difference between the first embodiment and the second embodiment is as follows: this embodiment online calibration equipment still includes gas density relay 1, and pressure sensor 2, temperature sensor 3, online calibration contact signal sampling unit 6, intelligent control unit 7 all set up on gas density relay 1. The second filtering element 16 is also provided in this embodiment, and the second filtering element 16 is disposed on the air path between the multi-way joint 9 and the normally-closed valve 11 to ensure the cleanness of the air.
The gas density relay 1 comprises a shell, and a base, an end seat, a pressure detector, a temperature compensation element, a plurality of signal generators, a machine core, a pointer and a dial which are arranged in the shell. One end of the pressure detector is fixed on the base and communicated with the base, the other end of the pressure detector is connected with one end of the temperature compensation element through the end seat, the other end of the temperature compensation element is provided with a beam, and the beam is provided with an adjusting piece which pushes the signal generator and enables a contact of the signal generator to be connected or disconnected. The movement is fixed on the base; the other end of the temperature compensation element is also connected with the machine core through a connecting rod or directly connected with the machine core; the pointer is installed on the movement and is arranged in front of the dial, and the pointer is combined with the dial to display the gas density value. The gas density relay 1 may also comprise a digital device with a display or a liquid crystal device. The gas density relay 1 outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell. The gas density relay of the present application may further include: an oil-filled type density relay, an oil-free type density relay, a gas density meter, a gas density switch, or a gas pressure gauge. Since this part belongs to the prior art, detailed description is omitted. The working principle is the same as that of the second embodiment, and is not described herein again.
Example four:
as shown in fig. 5, an online calibration device for a gas density relay includes: the device comprises a gas density relay 1, a pressure sensor 2, a temperature sensor 3, a normally-open valve 4, a gas source generating unit 5, an online checking contact signal sampling unit 6, an intelligent control unit 7, a multi-way connector 9, a normally-closed valve 11 and a flow controller 12. The same as the embodiment, the online calibration apparatus of the embodiment also includes a gas density relay 1; the difference is that the pressure sensor 2 and the temperature sensor 3 are arranged on the gas density relay 1, and the online check contact signal sampling unit 6 and the intelligent control unit 7 are separately arranged together. The working principle of the method can refer to the third embodiment, and details are not repeated herein.
Example five:
as shown in fig. 6, an online calibration device for a gas density relay includes: pressure sensor 2, temperature sensor 3, normally open valve 4, air supply generating unit 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many-way joint 9, air supply normally closed valve 10, normally closed valve 11, pressure adjustment mechanism 13. The biggest difference between the first embodiment and the second embodiment is as follows: the online checking device further comprises a pressure adjusting mechanism 13, and the pressure adjusting mechanism 13 is connected with the multi-way connector 9 through a normally-closed valve 11. The pressure adjustment mechanism 13 mainly includes a pressure adjustment mechanism housing 1301, a cavity 1302, a piston 1303, a driving member 1304, an adjustment rod 1305, and a sealing member 1306. Specifically, the pressure adjusting mechanism 13 is a cavity 1302 with an open end, and the other end of the cavity 1302 is communicated with the normally-closed valve 11; a piston 1303 is arranged in the cavity 1302, one end of the piston 1303 is connected with an adjusting rod 1305, the outer end of the adjusting rod 1305 is connected with a driving part 1304, the other end of the piston 1303 extends into the opening and is in sealing contact with the inner wall of the cavity 1302 through a sealing part 1306, and the driving part 1304 drives the adjusting rod 1305 to drive the piston 1303 to move in the cavity 1302, so that the volume of the cavity 1302 is changed, and the pressure is adjusted to rise and fall.
The working principle of the verification and monitoring of the embodiment is as follows: referring to the first embodiment, in a normal working state, the normally open valve 4 of the online calibration device is in an open state, the normally closed valve 11 is in a closed state, and the online calibration device monitors the gas density value in the electrical equipment 8 on line through the gas density detection sensor (the pressure sensor 2 and the temperature sensor 3) and the intelligent control unit 7; the gas density relay 1 verified on-line monitors the gas density value inside the electrical equipment 8. The online checking device is used for checking the gas density relay according to a set checking time or/and a checking instruction and the gas density value condition under the condition that the gas density relay is allowed to be checked: the online checking contact signal sampling unit 6 is adjusted to a checking state through the intelligent control unit 7, and in the checking state, the online checking contact signal sampling unit 6 cuts off a contact signal control loop of the online checked gas density relay 1 and connects the contact of the online checked gas density relay 1 to the intelligent control unit 7; the normally open valve 4 is closed through the intelligent control unit 7; the air source normally-closed valve 10 is opened through the intelligent control unit 7, the intelligent control unit 7 controls the air source generating unit 5 again, the air source generating unit 5 is enabled to be in a working mode, an air source required by online verification is provided, when the air pressure of the air source reaches a preset threshold value, the intelligent control unit 7 closes the air source normally-closed valve 10, and the intelligent control unit 7 controls the air source generating unit 5 again, so that the air source generating unit 5 is in a working stop mode; then, open normally closed valve 11 through intelligence accuse unit 7, intelligence accuse unit 7 is the control pressure adjustment mechanism 13 again, through the drive part 1304 drive adjust the pole 1305 and then drive the piston 1303 is in remove in the cavity 1302, make the volume of cavity 1302 change, make gas pressure slowly descend, make the gas density relay 1 of online institute check take place the contact signal action, the contact signal action transmits intelligence accuse unit 7 through online check contact signal sampling unit 6, pressure value, temperature value when intelligence accuse unit 7 moves according to the contact signal obtain the gas density value, or directly obtain the gas density value, detect out the contact signal action value of the gas density relay 1 of online institute check, accomplish the check-up work of the contact signal action value of gas density relay 1. Then, intelligence accuse unit 7 is the pressure adjustment mechanism 13 of control again, through drive part 1304 drives adjust pole 1305 and then drive piston 1303 is in remove in the cavity 1302, make the volume of cavity 1302 change, make gas pressure rise slowly, make online gas density relay 1 that verifies take place the contact signal and reset, the contact signal resets and transmits intelligence accuse unit 7 through online check contact signal sampling unit 6, intelligence accuse unit 7 obtains gas density value according to pressure value, temperature value when the contact signal resets, or directly obtains gas density value, detect out online gas density relay 1's that verifies contact signal return value, accomplish the check-up work of online gas density relay 1's contact signal return value. After all contact signal check-up work is accomplished, resume operation to normal operating condition through the control of intelligent control unit 7: the air source generating unit 5 and the pressure regulating mechanism 13 are in a stop working mode, the air source normally-closed valve 10 and the normally-closed valve 11 are both in a closed state, and the normally-opened valve 4 is in an open state; meanwhile, the intelligent control unit 7 adjusts the online checking contact signal sampling unit 6 to be in a working state, and a contact signal control loop of the online checked gas density relay 1 recovers to run to be in a normal working state.
Example six:
as shown in fig. 7, an online calibration device for a gas density relay includes: pressure sensor 2, temperature sensor 3, normally open valve 4, air supply generating unit 5, online check-up contact signal sampling unit 6, intelligent control unit 7, many-way joint 9, normally closed valve 11, pressure adjustment mechanism 13. The biggest difference between this embodiment and the fifth embodiment is: the pressure adjustment mechanism 13 of the online verification apparatus described in this embodiment mainly includes a pressure adjustment mechanism housing 1301, a driving component 1304, an air bag 1307, and a push rod 1308. Specifically, the pressure adjusting mechanism is an air bag 1307 with one end connected with a driving part, the air bag 1307 generates volume change under the driving of the driving part 1304 and a push rod 1308, and the air bag 1307 is communicated with the multi-way joint 9 and the gas density relay 1. The working principle of the method can refer to the fifth embodiment, and details are not described herein.
In a preferred embodiment, the online checking device may have a plurality of pressure sensors and temperature sensors, pressure values obtained by monitoring the plurality of pressure sensors may be compared and checked with each other, temperature values obtained by the plurality of temperature sensors may be compared and checked with each other, and corresponding plurality of gas density values obtained by monitoring the plurality of pressure sensors and the plurality of temperature sensors may be compared and checked with each other.
In another preferred embodiment, the online verification device may further comprise a gas density relay 1.
To sum up, the gas density relay on-line calibration device that this application provided carries out online calibration measurement to the contact signal (the pressure value when warning/shutting action) of gas density relay under ambient temperature to the corresponding pressure value when automatic conversion 20 ℃ of into realizes the performance detection to the contact (warning and shutting) value of gas density relay on line. The mounting positions of the gas density relay, the pressure sensor, the temperature sensor, the normally open valve, the normally closed valve, the online checking contact signal sampling unit and the intelligent control unit can be flexibly combined. For example: the gas density relay, the pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together, integrally designed and also can be designed in a split mode; can be arranged on the shell or on the multi-way joint, and can also be connected together through a connecting pipe. The normally open valve can be directly connected with electrical equipment, and can also be connected through a self-sealing valve or an air pipe. The pressure sensor, the temperature sensor, the online check contact signal sampling unit and the intelligent control unit can be combined together and are designed integrally; or a pressure sensor and a temperature sensor can be combined together to be designed integrally; and the contact signal sampling unit and the intelligent control unit can be verified on line and integrated. In short, the structure is not limited. The multi-way joint is provided with a first interface, a second interface, a third interface and a fourth interface which are communicated with each other, and two or more of the interfaces can be combined to simplify and flexibly design.
The online verification device may perform online verification according to a set time, or may perform online verification according to a set temperature (e.g., a high limit temperature, a high temperature, a low limit temperature, a low temperature, a normal temperature, 20 degrees, etc.). When the environment temperature of high temperature, low temperature, normal temperature and 20 ℃ is checked on line, the error judgment requirements are different, for example, when the environment temperature of 20 ℃ is checked, the accuracy requirement of the gas density relay can be 1.0 level or 1.6 level, and when the environment temperature is high, the accuracy requirement can be 2.5 level. The method can be implemented according to the relevant standard according to the temperature requirement. For example, according to 4.8 temperature compensation performance regulations in DL/T259 sulfur hexafluoride gas density relay calibration code, the accuracy requirement corresponding to each temperature value is met. The online checking device can compare the error performance of the density relay at different temperatures and different time periods. Namely, the performances of the gas density relay and the electrical equipment are judged by comparing the temperature ranges in different periods. The comparison of each period with history and the comparison of the history and the present are carried out. The density relay can also be subjected to physical examination. When necessary, the density relay contact signals can be checked at any time; the density value of the monitored electric equipment is judged whether to be normal or not by the gas density relay. The density value of the electrical equipment, the gas density relay, the pressure sensor and the temperature sensor can be judged, analyzed and compared normally and abnormally, and further the states of the electrical equipment, such as gas density monitoring, the density relay and the like, can be judged, compared and analyzed; the contact signal state of the gas density relay can be monitored and remotely transmitted. The contact signal state of the gas density relay can be known in the background: the system is opened or closed, so that one more layer of monitoring is provided, and the reliability is improved; the temperature compensation performance of the gas density relay can be detected, or detected and judged; the contact resistance of the contact point of the gas density relay can be detected or detected and judged; the insulating property of the gas density relay can be detected, or detected and judged. In addition, for the SF6 gas, a specific conversion method of the pressure-temperature characteristic of the SF6 gas can be calculated according to the Betty-Bridgman equation; for the SF6 mixed gas, a specific conversion method of the pressure-temperature characteristic of the SF6 mixed gas can be calculated according to a Dalton partial pressure law, a Betty-Bridgman equation and an ideal gas state equation.
This application structural arrangement is compact, reasonable, and each part has good rust-resistant, shock-proof ability, and the installation is firm, uses reliably, and the connection of each pipeline, dismouting are easily operated, and equipment and convenient maintenance of part. The gas density relay calibration device can complete the calibration work of the gas density relay without a maintainer going to the site, greatly improves the reliability of a power grid, improves the efficiency and reduces the cost. Meanwhile, in the whole verification process, the gas source required by verification is provided through the gas source generating unit, and the SF6 gas of the electrical equipment is not required for verification, so that the method is environment-friendly, safe and economical. The product of the technical scheme can also be applied to on-site frequent on-line verification of the gas density relay, the performance of gas density diagnosis, particularly zero verification diagnosis of the pressure sensor can be realized, and when the monitoring pressure is too high, the pressure can be released, so that serious problems caused by too high pressure are prevented.
The above detailed description of the embodiments of the present invention is only for exemplary purposes, and the present invention is not limited to the above described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, variations and modifications in equivalents may be made without departing from the spirit and scope of the invention, which is intended to be covered by the following claims.
Claims (17)
1. The utility model provides a gas density relay online calibration equipment which characterized in that includes: the intelligent control system comprises a gas density detection sensor, a normally open valve, a normally closed valve, a multi-way connector, a gas source generation unit, an online check contact signal sampling unit and an intelligent control unit;
the gas density detection sensor is communicated with the multi-way joint;
the multi-way joint is provided with a first interface, a second interface, a third interface and a fourth interface which are communicated with each other, wherein the first interface is connected with the gas density relay;
one end of the normally open valve is provided with an interface communicated with electrical equipment, and the other end of the normally open valve is communicated with a second interface of the multi-way connector; the normally open valve is configured to close or open the gas path of the electrical equipment, and the closing of the gas path of the electrical equipment is completed;
the gas path of the gas source generating unit is communicated with the third interface of the multi-way connector; the gas source generating unit is configured to provide a gas source when the gas density relay is checked on line;
one end of the normally-closed valve is communicated with the fourth interface of the multi-way connector, and the other end of the normally-closed valve is communicated with the atmosphere; the normally-closed valve is configured to close or open an air passage of a gas density relay connected with the multi-way connector, so that the gas density relay generates contact point signal action;
the online checking contact signal sampling unit is connected with the online checking gas density relay and is configured to sample a contact signal of the gas density relay;
the intelligent control unit is respectively connected with the normally open valve, the normally closed valve, the gas density detection sensor and the online check contact signal sampling unit, and is configured to control the normally open valve to be closed or opened, control the normally closed valve to be closed or opened, control pressure value collection and temperature value collection and/or gas density value collection, and detect a contact signal action value and/or a contact signal return value of the gas density relay;
wherein the contact signal comprises an alarm, and/or a latch.
2. The gas density relay online verification device of claim 1, wherein: the normally closed valve and/or normally open valve is sealed within a chamber or housing.
3. The gas density relay online verification device of claim 1, wherein: the flow controller is communicated with the other end of the normally-closed valve; or the flow controller is arranged between the multi-way joint and the normally-closed valve; the flow controller is configured to control a flow rate of the gas.
4. The gas density relay online verification device of claim 1, wherein: the air source generating unit comprises one of a compressor, an air pump, a pressure-generating pump, a booster pump, an electric air pump and an electromagnetic air pump.
5. The gas density relay online verification device of claim 1, wherein: the device also comprises an air source normally-closed valve, wherein the air source normally-closed valve is arranged between the multi-way connector and the air source generating unit.
6. The gas density relay online verification device of claim 1, wherein: the filter element is arranged on an air path connected with the normally open valve, the normally closed valve, the multi-way joint or the air source generating unit.
7. The gas density relay online verification device of claim 1, wherein: the multi-way connector or the air source generating unit is arranged on the base, and the multi-way connector or the air source generating unit is arranged on the base; the moisture treatment agent comprises one of an adsorbent and a drying agent.
8. The gas density relay online verification device of claim 1, wherein: still include gas leakage warning contact, gas leakage warning contact is established ties or is parallelly connected on the warning contact of the gas density relay of the online check-up of wanting, gas leakage warning contact still is connected with the intelligence accuse unit.
9. The gas density relay online verification device of claim 1, wherein: the pressure regulating mechanism is communicated with the other end of the normally-closed valve; the pressure adjustment mechanism is configured to adjust a pressure rise and fall of the gas.
10. The gas density relay online verification device of claim 9, wherein: during checking, the pressure adjusting mechanism is a closed air chamber which is communicated with the normally-closed valve, a heating element and/or a refrigerating element are arranged outside or inside the closed air chamber, and the temperature of the gas in the closed air chamber is changed by heating the heating element and/or refrigerating through the refrigerating element, so that the pressure of the gas density relay checked on the line is lifted; or,
the pressure adjusting mechanism is a cavity with an opening at one end, the other end of the cavity is communicated with the normally-closed valve, a piston is arranged in the cavity, one end of the piston is connected with an adjusting rod, the outer end of the adjusting rod is connected with a driving part, the other end of the piston extends into the opening and is in sealing contact with the inner wall of the cavity, and the driving part drives the adjusting rod to further drive the piston to move in the cavity; or,
the pressure adjusting mechanism is a closed air chamber which is communicated with the normally-closed valve, a piston is arranged in the closed air chamber and is in sealing contact with the inner wall of the closed air chamber, and a driving part is arranged outside the closed air chamber and pushes the piston to move in the cavity through electromagnetic force; or,
the pressure adjusting mechanism is an air bag with one end connected with a driving part, the air bag generates volume change under the driving of the driving part, and the air bag is communicated with the normally-closed valve; or,
the pressure adjusting mechanism is a corrugated pipe, one end of the corrugated pipe is communicated with the normally-closed valve, and the other end of the corrugated pipe stretches under the driving of the driving part;
wherein, the driving part comprises one of a magnetic force, a motor, a reciprocating mechanism, a Carnot cycle mechanism and a pneumatic element.
11. The gas density relay online verification device of claim 1, wherein: the gas density detection sensor is arranged on the multi-way joint; or the gas density detection sensor is arranged on a gas density relay for on-line verification.
12. The gas density relay online verification device of claim 1, wherein: the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or, a gas density transmitter consisting of a pressure sensor and a temperature sensor is adopted; alternatively, a density detection sensor using quartz tuning fork technology.
13. The gas density relay online verification device of claim 1, wherein: the online check contact signal sampling unit comprises an isolation sampling element, and the isolation sampling element is controlled by a normally open valve or an intelligent control unit; in a non-checking state, the online checking contact signal sampling unit is relatively isolated from a contact signal of the gas density relay on a circuit through an isolation sampling element; in a checking state, the online checking contact signal sampling unit cuts off a contact signal control loop of the gas density relay through an isolation sampling element, and connects the contact of the gas density relay with the intelligent control unit; the isolation sampling element comprises one of a travel switch, a microswitch, a button, an electric switch, a displacement switch, an electromagnetic relay, an optical coupler and a silicon controlled rectifier.
14. The gas density relay online verification device of claim 1, wherein: the gas density relay comprises a shell, and a base, a pressure detector, a temperature compensation element and at least one signal generator which are arranged in the shell; the gas density relay outputs a contact signal through the signal generator; the pressure detector comprises a bourdon tube or a bellows; the temperature compensation element adopts a temperature compensation sheet or gas sealed in the shell.
15. The gas density relay online verification device of claim 14, wherein: the gas density detection sensor is arranged on the multi-way joint; alternatively, the gas density detection sensor is provided on the gas density relay.
16. The gas density relay online verification device of claim 14, wherein: the online checking contact signal sampling unit and the intelligent control unit are arranged on the gas density relay.
17. The gas density relay online verification device of claim 1, wherein: the intelligent control unit further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wired communication mode or a wireless communication mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115128027A (en) * | 2022-07-29 | 2022-09-30 | 中煤科工集团沈阳研究院有限公司 | A structure and method for environmental pressure compensation of ultraviolet differential spectrum gas sensor |
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| CN115128027A (en) * | 2022-07-29 | 2022-09-30 | 中煤科工集团沈阳研究院有限公司 | A structure and method for environmental pressure compensation of ultraviolet differential spectrum gas sensor |
| CN115128027B (en) * | 2022-07-29 | 2023-09-19 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet spectrum-splitting gas sensor environment pressure compensation structure and method |
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