CN203376404U - Intelligent-type electric field abnormity safety alarming device - Google Patents

Abstract

The utility model relates to an intelligent electric field anomaly safety alarm device which can promptly remind inspectors to evacuate after the electric field changes, and is mainly used in electric field anomaly early warning and personal safety protection of key parts of power system substations and inspection channels. Its structure is that the power supply device provides power to other components through the voltage stabilizing device; the electromagnetic sensor group sends the read electromagnetic field strength signal in the space to the signal amplification device, and the signal amplification device converts the received signal into a current that can be recognized by the microprocessor The value is sent to the microprocessor; the microprocessor drives the buzzer or voice device to make a warning sound according to the induced potential in the space. The utility model is installed in the key area or on the inspection route, and can remind the personnel who want to enter the fault area to avoid risks in time, and provides a simple, effective and intelligent type for the operation, maintenance, test, protection and maintenance personnel of the power system. Advanced safety early warning protective gear to prevent or avoid personal injury accidents.

Description

Intelligent electric field abnormal safety alarm device

technical field

The utility model relates to a safety protection device capable of reminding inspectors after changes in the electric field, in particular to an intelligent electric field abnormality safety alarm device capable of timely reminding personnel to evacuate, which is mainly used in the electric field of key parts of power system substations and inspection channels Abnormal warning and personal safety protection.

Background technique

The power system requires personnel to conduct inspections, operations, maintenance, high-voltage tests, protection calibration, and measurement and debugging of equipment in substations. During inspection, inspection, maintenance and testing, electrical equipment in operation will suffer major faults such as overvoltage shock, system short circuit, equipment explosion and busbar grounding due to various reasons. After the fault, the ground around the fault point in the substation The potential rise exceeds the step voltage and contact voltage allowed by the safety standard. If people enter the above area by mistake, it will cause serious consequences such as injury or even death. According to the requirements of Article 2.2.4 of the "Electricity Safety Work Regulations" (substation part) issued by the State Grid Corporation: When the high-voltage equipment is grounded, the indoors are not allowed to approach the fault point within 4m, and the outdoors are not allowed to approach the fault point within 8m. In addition to wearing insulating boots, personnel should also wear insulating gloves when touching the shell and frame of the equipment. However, the scope of the fault point and the location of the fault need to be judged by the eyes and ears of the on-site personnel. At present, there is no intelligent alarm device that can give an early warning function for abnormal changes in the electric field in the substation. The influence of light and hearing will be affected by surrounding noise and other factors, resulting in misjudgment, which will pose a serious threat to the safety of personnel in the substation, and even cause unnecessary personal casualties. The personnel working in the substation are surrounded by a lot of live equipment and lines. In order to ensure personal safety, they need to know whether the distance between themselves and the location prone to failure exceeds the standard allowable value. Safety protection and alarm devices for equipment failure, short circuit grounding, and field strength changes in time. It can be seen that the intelligent electric field abnormal safety alarm device is one of the important protection devices to protect the safety of personnel entering the substation.

Utility model content

The utility model aims at the problems in the above-mentioned prior art, and provides an intelligent electric field abnormality safety alarm device, which solves the problem in the prior art that the abnormal change of the electric field in the substation cannot be alarmed in time and reminds personnel to pay attention.

In order to achieve the above object, the technical scheme of the utility model is as follows:

Including power supply device, voltage stabilizing device, microprocessor, electromagnetic sensor group, signal amplification device and buzzer or voice device; the power supply device provides power to other components through the voltage stabilizing device; the electromagnetic field strength in the space that the electromagnetic sensor group will read The signal is sent to the signal amplifying device, and the signal amplifying device converts the received signal into a current value recognizable by the microprocessor in proportion and then sends it to the microprocessor; the microprocessor drives the buzzer or voice according to the induced potential in the space The device makes a linear warning sound at this potential.

The power supply device is a solar battery and a storage battery, and the solar battery stores the collected energy through the storage battery.

The output end of the microprocessor is connected to a relay, and the normally closed contacts of the relay are connected in series between the solar cell and the storage battery, so as to control the connection between the storage battery and the solar cell when the storage battery is fully charged, and the voltage sampling circuit is connected to the storage battery and the microprocessor respectively. When the voltage sampling circuit detects that the voltage of the battery is low enough to be charged, the microprocessor controls the relay not to act to ensure that the solar battery can recharge the collected energy to the battery.

The electromagnetic sensor group is Hall sensor or optical fiber current sensor with magneto-optic effect.

The electromagnetic sensor group includes three groups.

The microprocessor is connected with the upper computer by wire or wirelessly.

The advantages and effects of the utility model are as follows:

Due to the adoption of the above scheme, in actual work, after a short circuit and ground fault occur on the busbar in the substation, before inspecting, repairing, testing and maintaining the dangerous area near the fault point, the intelligent electric field abnormal safety alarm fixed on the key part or inspection route in advance The device can send out a "beep-beep-" sound or a voice alarm according to the size of the potential in the space to remind personnel not to approach the area near the fault point. The device is installed in key areas or inspection routes, and can also remind other personnel who want to enter the fault area to avoid risks in time. , Effective and intelligent safety warning protective gear, so as to prevent or avoid the occurrence of personal injury or death accidents. In addition, the utility model has a light and handy shape, compact structure, good sealing performance, rainproof and dustproof, and is convenient for installation and debugging outdoors or at any interval between inspection equipment; after the application of solar cells and batteries, the power consumption of the device extremely low, so that the device can work uninterrupted for a long time.

Description of drawings

Fig. 1 is a schematic diagram of the installation position of the utility model in a substation.

Figure 2 is a schematic diagram of the electrical structure of the utility model.

In the figure, 1-solar battery and battery device, 2-voltage stabilizing device, 3-microprocessor, 4-electromagnetic sensor group, 5-signal amplification device, 6-buzzer or voice device, 7-relay, 8- Voltage sampling circuit, 9-upper computer PC. the

Detailed ways

The utility model will be further specifically described below in conjunction with specific embodiments with reference to the accompanying drawings.

Example

The site protection diagram of the utility model is shown in Figure 1. It can be seen from Figure 1 that the device can perceive the electromagnetic field conditions within its monitoring range no matter day or night, and emit a "beep-beep-" sound that is linearly related to the potential or send out other voices to warn maintenance personnel.

When in use, install the device in the key area or around the inspection line. It can be installed underground, on the equipment structure and on the side of the aisle around the inspection line. It can be connected according to the electrical installation diagram. The device is lightweight and compact. The structure has good sealing, rainproof and dustproof, which is convenient for installation and debugging outdoors or anywhere between inspection equipment; after the application of solar cells and batteries, the power consumption of the device is extremely low, so the device can be used continuously for a long time Work.

The schematic diagram of the electrical structure of the utility model is shown in Fig. 2 . It can be seen from the figure that the device includes a solar cell and storage battery device 1, a voltage stabilizing device 2, a microprocessor 3, an electromagnetic sensor group 4, a signal amplification device 5, a buzzer or a voice device 6, a relay 7, a voltage sampling circuit 8, Host computer (PC) 9; the main power supply of this device comes from solar cells and battery devices 1, and the input electric energy also needs to pass through the voltage stabilizing device 2 to provide stable power for each component of the device. The microprocessor 3 is the core of the whole device. All input and output signals must be analyzed and processed by the microprocessor 3 before corresponding actions can be taken. Under the control of the microprocessor 3, sensors with high sensitivity to the space electromagnetic field, such as Hall sensors or optical fiber current sensors with magneto-optic effects, etc., send the electromagnetic field strength signal in the read space to the signal amplification device 5, and the signal is amplified. The device 5 converts the received signal into a proportional current signal after processing, so that the microprocessor 3 can identify it, and the processor 3 transmits the information to the host computer (PC) 9 while analyzing and processing. The microprocessor 3 can locate the sensor closest to the fault point according to the maximum value detected by the three groups of sensors, and at the same time drive the buzzer or voice device 6 to make a linear "beep-beep-" sound at the highest frequency, that is, to issue a voice alarm , whether the distance between the warning staff and the fault point exceeds the limit, if within the normal range, this device controls the buzzer or the voice device 6 to not sound. The output terminal of the microprocessor 3 is connected to the relay 7, and the normally closed contact of the relay 7 is connected in series between the solar cell and the storage battery, so as to control the connection between the storage battery and the solar cell when the storage battery is fully charged, and the voltage sampling circuit is connected with the storage battery and the microprocessor When the voltage sampling circuit 8 detects that the battery voltage is as low as the charging voltage, the microprocessor 3 controls the relay 7 not to act, so as to ensure that the solar battery can recharge the collected energy to the battery. The service life of the storage battery will not be reduced due to overcharging and over-discharging. At the same time, the device can work continuously for a long time with extremely low power consumption. Under the control of the microprocessor 3, it can detect each The signals of the sensors are compared, and so on. The unique design reduces the installation volume, reduces the difficulty of installation, reduces the cost of users, and is more competitive in the market.

The utility model is based on the following principles:

(1) An N-type semiconductor sheet with a length of L, a width of S, and a thickness of d, in the direction perpendicular to the plane of the semiconductor sheet, a magnetic field with a magnetic induction intensity of B is applied, and if a current Ic is passed in the direction of the length, it will move The charge is affected by the Lorentz force, and the positive and negative charges will move to the two ends of the conductor in the direction perpendicular to the magnetic field and the current, respectively, and form a stable electromotive force U _H at the two ends of the conductor, which is the Hall electromotive force (or called This phenomenon is called the Hall effect. The magnitude of the Hall voltage U _H =R I B/d=K _H I _C B, where R is the Hall constant; K _H is the product sensitivity of the Hall element (K _H = R/d). It can be seen from the Hall voltage formula: for a formed Hall sensor, the product sensitivity K _H is a constant value, then U _H ∝ I _C B, as long as the size of U _H is measured by the measuring circuit, the two values of B and I _C Among the parameters, if one is known, the other can be obtained, so any unknown quantity that can be converted into B or J can be measured by Hall elements, and any unknown quantity that can be converted into the product of B and I can also be measured. The measurement of electrical parameters is realized according to this principle. If the control current I _C is constant, the magnetic induction B is proportional to the measured current, it can be made into a Hall current sensor to measure the current; if the magnetic induction B is constant, I _C is proportional to the measured voltage, it can be made into a voltage sensor Measuring voltage, using Hall voltage and current sensors to measure the power factor, electric power and frequency of alternating current. It can be known from U _H = KI _C B: If I _C is DC, and the current I _O that generates the magnetic field B is AC, U _H is AC; if I _O is also DC, the output is also DC. When I _C is AC and I _O is also DC, output AC with the same frequency as I _C and its amplitude is proportional to the measured DC I _O , change the direction of the measured current I _O , and output voltage U _H polarity Change accordingly. Therefore, the Hall sensor can be used to measure both the DC flow and the AC flow.

(2) The fiber optic current sensor utilizes the Faraday effect of magneto-optical materials. In an optically isotropic transparent medium, an external magnetic field H can rotate the polarization plane of plane polarized light propagating in the direction of the magnetic field in the medium. The polarizer can be determined. Therefore, using the magneto-optic crystal as the material and the optical fiber current sensor designed on the principle of the Faraday rotation optical effect, it can accurately measure the current of 32 kA under high voltage. Moreover, the device has simple structure, convenient use, and short response time, especially its good insulation performance, small size, low cost, wide frequency band, short response time, and can be used to measure DC, AC and pulsed large currents at the same time, so It is expected to be an ideal sensor for measuring large currents under high voltage.

From the above analysis, it can be concluded that the parameters of high voltage and high current can be measured by using Hall sensor and optical fiber current sensor, and the sensor group made of Faraday effect and Hall effect of magneto-optic material can be used for lightning shock, system Detect the abnormal changes of the electromagnetic field caused by faults such as short circuit, equipment burnout, and line disconnection. After comparing the detection values of each sensor by the microprocessor, the voltage value of each detection point is proportionally reflected, and the location of the fault point can be determined in time. Intuitively send out "beep-beep-" sound or voice alarm to remind personnel in the substation to evacuate from dangerous areas and ensure personnel safety.

The above-mentioned embodiments are only used for convenience of description, rather than to limit the utility model. Without going beyond the scope of the present idea, various simple deformations and modifications made by those skilled in the art should be included in the claims. in the range.

Claims (6)

1. intelligent electric field exception safety warning device, is characterized in that comprising supply unit, stable-pressure device, microprocessor, electromagnetic sensor group, signal amplifying apparatus and hummer or voice device; Supply unit provides power supply by stable-pressure device for other parts; The electromagnetic sensor group is delivered to signal amplifying apparatus by electromagnetic intensity signal in the space of reading, and signal amplifying apparatus sends microprocessor to after being converted to the discernible current value of microprocessor by the signal of reception is proportional; Microprocessor, according to space internal induction electromotive force situation, drives hummer or voice device to do linear caution sound with this electromotive force.

2. intelligent electric field exception safety warning device according to claim 1, is characterized in that described supply unit is solar cell and accumulator, and solar cell passes through accumulators store by the energy of collection.

3. intelligent electric field exception safety warning device according to claim 2, the output terminal that it is characterized in that described microprocessor connects relay, the relay normally closed contact is connected serially between solar cell and accumulator, be full of between rear shutoff accumulator and solar cell and be connected to control accumulator, voltage sampling circuit is connected with microprocessor with accumulator respectively, voltage sampling circuit detects battery tension and is low to moderate while needing charging voltage, the microprocessor pilot relay is failure to actuate, and guarantees that solar cell can fill accumulators again by the energy collected.

4. intelligent electric field exception safety warning device according to claim 1, is characterized in that the fibre optic current sensor that described electromagnetic sensor group is Hall element or magneto-optic effect.

5. intelligent electric field exception safety warning device according to claim 1, is characterized in that described electromagnetic sensor group comprises three groups.

6. intelligent electric field exception safety warning device according to claim 1, is characterized in that described microprocessor is connected with host computer by wired or wireless mode.

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