CN201402286Y - Voltage drop detection device for secondary circuit of voltage transformer - Google Patents
Voltage drop detection device for secondary circuit of voltage transformer Download PDFInfo
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- CN201402286Y CN201402286Y CN 200920142349 CN200920142349U CN201402286Y CN 201402286 Y CN201402286 Y CN 201402286Y CN 200920142349 CN200920142349 CN 200920142349 CN 200920142349 U CN200920142349 U CN 200920142349U CN 201402286 Y CN201402286 Y CN 201402286Y
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Abstract
本实用新型涉及一种电压互感器二次回路压降检测装置，包括位于电能表端的主机、位于电压互感器端的辅机，主机和辅机分别包括控制模块、测量模块、人机接口模块，它还包括受控于控制模块用于向测量模块输出同步采样频率的GPS同步模块、与控制模块进行数据交互的通信模块、掌上电脑，各通信模块具有与掌上电脑进行数据通信的通信接口，本实用新型借助掌上电脑对辅机和主机分别同步测量的数据进行传送，从而省去连接在电能表侧和PT端之间的临时电缆，从测量手段上杜绝了因拉设电缆可能引起的电网事故，保持电网的安全稳定运行的同时，提高了电能计量的准确性。
The utility model relates to a secondary circuit voltage drop detection device of a voltage transformer, which comprises a main machine located at the end of the electric energy meter and an auxiliary machine located at the end of the voltage transformer. The main machine and the auxiliary machine respectively include a control module, a measurement module and a man-machine interface module. It also includes a GPS synchronization module controlled by the control module for outputting synchronous sampling frequency to the measurement module, a communication module for data interaction with the control module, and a handheld computer. Each communication module has a communication interface for data communication with the handheld computer. The new model transmits the synchronously measured data of the auxiliary machine and the main machine with the help of a handheld computer, thereby eliminating the need for a temporary cable connected between the power meter side and the PT end, and preventing the grid accident that may be caused by pulling the cable from the measurement method. While maintaining the safe and stable operation of the power grid, the accuracy of electric energy measurement is improved.
Description
Technical field
The utility model relates to a kind of electric energy metrical detecting instrument, relates in particular to a kind of device that is used to detect the voltage transformer secondary loop pressure drop.
Background technology
The accuracy of electric energy metrical is the important indicator that is related to power supply and electricity consumption sectional interests, reduces electric energy metering error, and the accuracy that improves metering is the common requirement of each side.Electric energy metrical generally has measurement on the spot and strange land to measure two kinds, and for the mode of measuring on the spot, the distance of electric energy meter and mutual inductor is very near, and intermediate link is few, so there is not the problem of voltage transformer secondary loop pressure drop in this metering system.And for the strange land metering system, this metering system is especially general in China, generally is mutual inductor at outdoor, electric energy meter in the pulpit, connects by tens meters leads to hundreds of rice therebetween, and also have fuse, switch and connection terminal etc. in lead.Fig. 1 has provided the wiring schematic diagram of voltage transformer (VT) and current transformer, among the figure, PT is a voltage transformer (VT), the secondary endpiece is received on the potential winding of electric energy meter by high-speed switch K, fuse S, CT is a current transformer, its secondary endpiece is received on the current coil of electric energy meter, and the electric weight of electric energy meter indication be multiply by the no-load voltage ratio coefficient of PT and CT, is user's actual electric weight.Therefore, as seen from Figure 1, electric energy metering error is made up of the resultant error of mutual inductor, the error of electric energy meter and the error that the voltage transformer pt secondary voltage drop causes.In these factors, the influence of PT secondary voltage drop is often comparatively serious.
Voltage transformer (VT) in electric power meter distance common and electric energy meter is far away, and bigger secondary load electric current and secondary circuit impedance cause the amplitude and the phase place of PT secondary terminals voltage and electric power meter end voltage inconsistent, influence the accurate, just of electric energy metrical.The PT secondary voltage drop is subjected to extensive concern as a part that constitutes error in dipping, and strict monitoring, control criterion are all arranged both at home and abroad.Regulation among the industry standard of China---the DL/T448-2000 " electric power meter technical management rules ": the voltage transformer secondary loop voltage that I, II class are used for the electric power meter of trade settlement is fallen and should be not more than 0.2% of its rated secondary voltage, and voltage transformer secondary electricity loop pressure drop should be not more than 0.5% of its rated secondary voltage in other electric power meters; Reply voltage transformer secondary loop pressure drop in service regularly detects, and the general provision sense cycle is 2 years.Therefore, need a kind of pick-up unit that can be used to detect the PT secondary circuit voltage drop accurately, safely, efficiently.
Existing P T secondary circuit voltage drop pick-up unit generally includes main and auxiliaries, main frame is positioned at electric power meter end, subsidiary engine is positioned at the voltage transformer (VT) end, main and auxiliaries comprises control module respectively, measurement module and human-machine interface module, control module is mainly controller, as CPU or MCU etc., measurement module is mainly by filtering circuit, shaping circuit, compositions such as A/D converter, human-machine interface module is connected with the control module output terminal, be used for showing measurement result of calculation, ratio as secondary circuit, angular difference and voltage drop value etc., when carrying out in-site measurement, need lay tens meters cables from voltage transformer (VT) and electric energy meter to hundreds of rice, the detection that is this secondary circuit voltage drop is undertaken by wired mode, because cable need be walked around various obstacles when laying, and time-consuming effort again, and the power grid accident that might cause, influence the safe and stable operation of electrical network.
The utility model content
The utility model purpose is exactly but that a kind of pick-up unit that saves cable and synchro measure voltage transformer secondary loop pressure drop is provided in order to overcome the deficiencies in the prior art.
In order to reach the foregoing invention purpose, the technical solution of the utility model is: a kind of voltage transformer secondary loop pressure drop pick-up unit, it is used to measure the secondary circuit voltage drop between electric energy meter and the voltage transformer (VT), comprise the main frame that is positioned at electric power meter end, be positioned at the subsidiary engine of voltage transformer (VT) end, described main and auxiliaries comprises control module respectively, gather the measurement module of the voltage signal of electric energy meter and voltage transformer (VT) with described control module being used to of being electrically connected, be electrically connected with control module one output terminal and be used for the human-machine interface module that information shows, described each measurement module has the voltage input end mouth that is connected with voltage transformer (VT) with corresponding electric energy meter, it comprises that also being controlled by described control module is used for GPS synchronization module to described measurement module output synchronized sampling frequency, the communication module of carrying out data interaction with described control module, palm PC, described each communication module has the communication interface of carrying out data communication with described palm PC, in working order, the GPS synchronization module that the control module of main frame and the control module of subsidiary engine start is respectively separately sampled to the voltage of corresponding electric energy meter and voltage transformer (VT) with the control survey module, the sampled data of subsidiary engine is stored in earlier on its communication module, by palm PC data are sent to its control module by the communication module of main frame successively again, the control module of main frame is calculated the ratio of secondary circuit, angular difference and voltage drop value, and show by human-machine interface module.
Further, the sampling pulse generator that described GPS synchronization module comprises gps receiver, is electrically connected with the output terminal of described gps receiver, described gps receiver is used to export synchronous low frequency pulse signal, described sampling pulse generator is used to produce the required high frequency sampling pulse of described measurement module, and described high frequency sampling pulse in per second, be forced to the low frequency pulse signal of gps receiver output synchronously at least once.
Described GPS synchronization module also comprises pulse per second (PPS) detecting device, crystal oscillating circuit, described pulse per second (PPS) detecting device is connected electrically between described gps receiver output terminal and the crystal oscillating circuit output terminal, and the output terminal of described pulse per second (PPS) detecting device and described sampling pulse generator input end are electrically connected.
The clocking error of described gps receiver is less than 200ns.
The voltage input end mouth of described measurement module comprises phase three-wire three and two kinds of modes of connection of three-phase and four-line.
Thereby also having to be used for being electrically connected with described voltage transformer (VT), the measurement module of described subsidiary engine measures the electric current access interface of loop load to gather current signal on the voltage transformer (VT).
Because the utilization of technique scheme, the utility model compared with prior art has following advantage: the utility model by palm PC to subsidiary engine and main frame respectively the data of synchro measure transmit, thereby save the temporary cable that is connected between electric energy meter side and the PT end, stopped to establish the power grid accident that cable may cause from measurement means because of drawing, when keeping the safe and stable operation of electrical network, improved the accuracy of electric energy metrical.
Description of drawings
Accompanying drawing 1 is a wiring schematic diagram between voltage transformer (VT) and the electric energy meter;
Accompanying drawing 2 is the utility model pick-up unit functional schematic block diagram;
Accompanying drawing 3 is the theory diagram that the utility model pick-up unit main frame is further realized;
Accompanying drawing 4 is the theory diagram that the utility model pick-up unit subsidiary engine is further realized;
Wherein: 1, main frame; 11, control module; 12, measurement module; 13, human-machine interface module; 14, communication module; 15, GPS synchronization module;
2, subsidiary engine; 21, control module; 22, measurement module; 23, human-machine interface module; 24, communication module; 25, GPS synchronization module;
15, GPS synchronization module; 151, gps receiver; 152, sampling pulse generator; 153, pulse per second (PPS) detecting device; 154, crystal oscillating circuit;
25, GPS synchronization module; 251, gps receiver; 252, sampling pulse generator; 253, pulse per second (PPS) detecting device; 254, crystal oscillating circuit;
3, palm PC.
Embodiment
Below in conjunction with accompanying drawing the utility model preferred embodiment is elaborated:
Voltage transformer secondary loop pressure drop pick-up unit as shown in Figure 2, it comprises main frame 1, subsidiary engine 2 and the palm PC 3 that is used for Data transmission between main frame 1 and subsidiary engine 2 are formed, when using at the scene, main frame 1 is positioned at electric power meter end (Wh end), subsidiary engine 2 is positioned at the voltage transformer pt end, main frame 1 is measured and is stored with 2 pairs of corresponding input voltages of subsidiary engine, the data that subsidiary engine 2 records send main frame 1 to by palm PC 3, main frame 1 calculates data that both survey, thereby draw the information such as pressure drop of secondary circuit, the existing at first function of main frame 1 and subsidiary engine 2 is realized and principle of work specifies as follows:
Described main frame 1 mainly is made up of control module 11, measurement module 12, human-machine interface module 13, communication module 14 and GPS synchronization module 15, and as shown in Figure 3, control module 11 is a nucleus module, is mainly realized by a CPU; Measurement module 12 comprises filtering shaping circuit, sampling hold circuit S/H, the A/D converter composition that output terminal is electrically connected successively, the CPU input end of the output of A/D converter and control module 11 is electrically connected, measurement module 12 has the voltage input end mouth, this voltage input end mouth is used to connect the voltage terminal of electric power meter end, it has three-phase and four-line and two kinds of modes of connection of phase three-wire three, and the input signal cable of port should be corresponding one by one with the sign of terminal; The output terminal of human-machine interface module 13 input ends and control module 11 is electrically connected, it mainly is made of display circuit and display thereof, in the present embodiment, display can adopt LCDs, resolution is chosen in 640*480, it can show full menu in Chinese and operation indicating, and can show voltage and other measurement of correlation information that ratio, angular difference, pressure drop, resultant error, PT end and Wh hold by a screen; Communication module 14 and control module 11 mutually two-way connections, and described communication module 14 has and palm PC 3 communication interface of data transmission mutually; GPS synchronization module 15 also is an integrated circuit modules, its sampling pulse generator 152 that mainly is electrically connected by the pulse per second (PPS) detecting device 153 between the output terminal of gps receiver 151, crystal oscillating circuit 154, the output terminal that is connected electrically in described gps receiver 151 and crystal oscillating circuit 154, with described pulse per second (PPS) detecting device 153 output terminals is formed, and gps receiver 151 outputs have two kinds of time signals usually: the one, and the pulse signal (1pps) of interval 1s; The 2nd, the universal time corresponding and the date code (year, month, day, hour, min, second) of serial ports output with pulse front edge.Multiple gps receiver is arranged on the existing market,, generally require the gps clock error, select the special-purpose GPS receiver module of producing by motorola inc in the present embodiment for use less than 200ns because the accuracy of PT secondary voltage drop measurement requirement is higher.Because the influence of bad or some interference of satellite-signal, the 1pps pulse may not meet the demands, and the reply pulse quality detects, and therefore, is provided with pulse per second (PPS) detecting device 153 in the present embodiment, detects and just exports to Synchronous Sampling Pulses Gremerator 152 after qualified.The 1pps pulse of gps receiver 151 being exported by the high-frequency impulse counting that adopts quartz crystal oscillator circuit 154 to produce detects, and this detection not only can detect pulse width, can also detect rising edge of a pulse, negative edge, high level, low level width.Because gps receiver 151 outputs is the low frequency pulse per second (PPS), can not be directly as the sampling control signal of the ADC of measurement module 12, therefore require to be provided with sampling pulse generator 152 and produce the higher sampling pulse of frequency, and make its per second be forced to the 1pps impulsive synchronization once, control ADC in per second, carry out uniformly-spaced, synchronized sampling.Synchronous Sampling Pulses Gremerator 152 can adopt the phase locking frequency multiplying circuit to realize.
Above-mentioned functional structure to main frame 1 is introduced, the functional structure of subsidiary engine 2 and main frame 1 are basic identical, it mainly comprises control module 21, measurement module 22, human-machine interface module 23, communication module 24 and GPS synchronization module 25 are formed, above-mentioned control module 21, measurement module 22, communication module 24, the hardware implementation mode of GPS synchronization module 25 and main frame 1 are basic identical, wherein, GPS synchronization module 25 also is an integrated circuit modules, it is mainly by gps receiver 251, crystal oscillating circuit 254, be connected electrically in the pulse per second (PPS) detecting device 253 between the output terminal of the output terminal of described gps receiver 251 and crystal oscillating circuit 254, form with the sampling pulse generator 252 that described pulse per second (PPS) detecting device 253 output terminals are electrically connected, as shown in Figure 4, do not repeat them here.Need to prove that the voltage input end mouth of measurement module 22 is used to connect the voltage terminal of voltage transformer (VT), it also has three-phase and four-line and two kinds of modes of connection of phase three-wire three, and the input signal cable of port should be corresponding one by one with the sign of terminal.Man-machine construction module 23 also adopts the mode of LCDs, and it is used for showing information such as GPS state, the mode of connection, metering system, battery information, time, voltage effective value, frequency when measuring.Simultaneously, thereby the measurement module 22 of subsidiary engine 2 also has and is used for the external impressed current mutual inductor to obtain the electric current input interface that the transformer secondary circuit electric current carries out the loop load measurement, and it also has three-phase and four-line and two kinds of modes of connection of phase three-wire three.
Now the course of work of the present utility model is briefly introduced: the measurement pattern of pick-up unit of the present utility model is single-ended measurement, promptly in measuring process, there is not data communication channel between main frame 1 and the subsidiary engine 2, when just measuring, the voltage measurement of the voltage measurement of 1 pair of electric energy meter of main frame and 2 pairs of voltage transformer (VT) of subsidiary engine is independently to carry out, in measuring process, measurement data is stored in earlier in separately the communication module, the measurement back that finishes is passed to the measured data of main frame and main frame by palm PC with the measurement data of subsidiary engine and is synthesized calculating, thereby obtain pressure drop information, the concrete course of work is: start main frame 1 at first respectively and measure (be more or less the same start-up time and be advisable in 25 seconds) with subsidiary engine 2, each GPS synchronization module output synchronizing pulse is to control each measurement module 12,22 sample frequency, thereby guarantee the sample-synchronous of main frame 1 and subsidiary engine 2, measure the gained data storage in this locality, measurement finishes data transfer that the back surveys subsidiary engine by palm PC 3 to main frame, thereby the data that the control module 11 of main frame 1 records with himself after receiving the measurement data of subsidiary engine are calculated, thereby draw the ratio of PT secondary circuit, information such as angular difference and pressure drop, and by its human-machine interface module 13 The above results is shown, output or preservation.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920142349 CN201402286Y (en) | 2009-04-03 | 2009-04-03 | Voltage drop detection device for secondary circuit of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200920142349 CN201402286Y (en) | 2009-04-03 | 2009-04-03 | Voltage drop detection device for secondary circuit of voltage transformer |
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| CN201402286Y true CN201402286Y (en) | 2010-02-10 |
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| CN 200920142349 Expired - Lifetime CN201402286Y (en) | 2009-04-03 | 2009-04-03 | Voltage drop detection device for secondary circuit of voltage transformer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130501A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | Wireless synchronous data acquisition device for checking direct current transformer of direct current converter station |
| CN103513221A (en) * | 2013-10-14 | 2014-01-15 | 国家电网公司 | Secondary voltage drop/secondary load on-line monitoring device and system and monitoring method thereof |
| CN104267374A (en) * | 2014-10-17 | 2015-01-07 | 成都思晗科技有限公司 | Online detecting and state assessing system of metering device |
| CN104316746A (en) * | 2014-10-14 | 2015-01-28 | 钱坤 | Smart measurement and computational analysis method of PT secondary circuit voltage and pressure drop |
| CN106154026A (en) * | 2016-06-27 | 2016-11-23 | 国网河南省电力公司南阳供电公司 | A kind of Novel secondary pressure drop tester |
| CN107153133A (en) * | 2017-04-24 | 2017-09-12 | 祝曙光 | Secondary voltage drop/load on-line monitoring system |
| CN112034698A (en) * | 2020-08-31 | 2020-12-04 | 天津津航计算技术研究所 | Universal time service and timing method |
| CN113820632A (en) * | 2020-06-18 | 2021-12-21 | 杭州普安科技有限公司 | Passive power secondary circuit wiring checking system and method |
| CN114325241A (en) * | 2022-01-04 | 2022-04-12 | 国网上海市电力公司 | An online monitoring model method for abnormal state of metering secondary circuit |
-
2009
- 2009-04-03 CN CN 200920142349 patent/CN201402286Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130501A (en) * | 2011-01-19 | 2011-07-20 | 四川电力科学研究院 | Wireless synchronous data acquisition device for checking direct current transformer of direct current converter station |
| CN103513221A (en) * | 2013-10-14 | 2014-01-15 | 国家电网公司 | Secondary voltage drop/secondary load on-line monitoring device and system and monitoring method thereof |
| CN103513221B (en) * | 2013-10-14 | 2016-06-29 | 国家电网公司 | Secondary voltage drop/secondary load on-Line Monitor Device and system and monitoring method thereof |
| CN104316746A (en) * | 2014-10-14 | 2015-01-28 | 钱坤 | Smart measurement and computational analysis method of PT secondary circuit voltage and pressure drop |
| CN104267374A (en) * | 2014-10-17 | 2015-01-07 | 成都思晗科技有限公司 | Online detecting and state assessing system of metering device |
| CN104267374B (en) * | 2014-10-17 | 2017-09-26 | 成都思晗科技股份有限公司 | Metering device on-line checking and status assessing system |
| CN106154026B (en) * | 2016-06-27 | 2018-09-18 | 国网河南省电力公司南阳供电公司 | A kind of secondary pressure drop tester |
| CN106154026A (en) * | 2016-06-27 | 2016-11-23 | 国网河南省电力公司南阳供电公司 | A kind of Novel secondary pressure drop tester |
| CN107153133A (en) * | 2017-04-24 | 2017-09-12 | 祝曙光 | Secondary voltage drop/load on-line monitoring system |
| CN113820632A (en) * | 2020-06-18 | 2021-12-21 | 杭州普安科技有限公司 | Passive power secondary circuit wiring checking system and method |
| CN112034698A (en) * | 2020-08-31 | 2020-12-04 | 天津津航计算技术研究所 | Universal time service and timing method |
| CN112034698B (en) * | 2020-08-31 | 2021-07-02 | 天津津航计算技术研究所 | Universal time service and timing method |
| CN114325241A (en) * | 2022-01-04 | 2022-04-12 | 国网上海市电力公司 | An online monitoring model method for abnormal state of metering secondary circuit |
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