CN105116203A - A high-voltage charged display device by monitoring the leakage current of high-voltage equipment - Google Patents

Abstract

The invention discloses a high-voltage live display device for monitoring leakage current of high-voltage equipment, which comprises a three-phase current sensor, a TVS (transient voltage suppressor), a three-phase amplifying and filtering circuit, a main control MCU (microprogrammed control unit), an LED circuit and a locking circuit, wherein the LED circuit comprises an LED driving circuit and an LED main circuit, the locking circuit comprises a locking driving circuit, the output end of the three-phase current sensor is connected with the input end of the TVS tube and the input end of the three-phase amplification filter circuit respectively, the output end of the three-phase amplification filter circuit is connected with the input end of the master control MCU, the output end of the master control MCU is connected with the input end of the LED drive circuit and the input end of the locking drive circuit respectively, the output end of the LED drive circuit is connected with the input end of the LED main circuit, and the output end of the locking drive circuit is connected with the input end of the electromagnetic lock main circuit and the input end of the computer key main circuit respectively. The high-voltage equipment can realize the installation and maintenance of the high-voltage live display device without power failure.

Description

A high-voltage charged display device by monitoring the leakage current of high-voltage equipment

technical field

The invention relates to a high-voltage charged display device which monitors the leakage current of high-voltage equipment.

Background technique

With the development of society, electricity plays an irreplaceable role in human production and life. Therefore, it is particularly important to ensure the safety and stability of substation operating equipment. When the high-voltage electrical equipment (line) needs to be operated and overhauled, the staff needs to know whether the high-voltage equipment (line) has been powered off, so as to start the overhaul. For this reason, the emergence of the high-voltage live display, which interfaces with the anti-mistake device, incorporates the information of whether it is live or not into the anti-mistake logic judgment and forcibly locks it, thereby effectively preventing misoperation accidents.

At present, the existing conventional high-voltage live display devices on the market need to be installed and maintained in a power failure, which can no longer meet the production requirements of the power system.

Contents of the invention

The problem to be solved by the present invention is to provide a high-voltage electrified display device that monitors the leakage current of high-voltage equipment and does not require power-off installation and maintenance.

In order to solve the above technical problems, the present invention adopts the following technical scheme: a high-voltage charged display device that monitors the leakage current of high-voltage equipment, and the high-voltage charged display device includes a three-phase current sensor, a TVS tube, a three-phase amplifier filter circuit, and a main MCU, LED circuit and locking circuit, described LED circuit comprises LED driving circuit and LED main circuit, described locking circuit comprises locking driving circuit, electromagnetic lock main circuit and computer key main circuit, the output terminal of described three-phase current sensor is respectively It is connected with the input end of the TVS tube and the input end of the three-phase amplifying filter circuit, the output end of the three-phase amplifying filter circuit is connected with the input end of the main control MCU, and the output end of the main control MCU is connected with the LED drive circuit respectively. The input end and the input end of the lock drive circuit are connected, the output end of the LED drive circuit is connected with the input end of the LED main circuit, and the output end of the lock drive circuit is connected with the input end of the electromagnetic lock main circuit and the computer key main circuit respectively. input connection. The three-phase current sensor collects the leakage current signal of the three-phase high-voltage equipment, and the TVS tube clamps the potential at a certain voltage value when the overvoltage (overcurrent) is struck by lightning to prevent damage to the three-phase current sensor, which can effectively improve the anti-interference ability in harsh environments , the three-phase amplification and filtering circuit amplifies and filters the signals collected by the three-phase current sensor, and the main control MCU collects, stores, calculates and analyzes the signals. When the leakage current signal of the high-voltage equipment is higher than the safety threshold preset by the main control MCU , the main control MCU lights up the corresponding LED lights through the LED drive circuit, indicating that the circuit is in a charged state, and at the same time through the locking drive circuit, the main circuit of the electromagnetic lock and the main circuit of the computer key are in a power-off state, the electromagnetic lock is locked, and the computer key is tested for electricity. If the leakage current signal of the high-voltage equipment is lower than the preset safety threshold of the main control MCU, the main control MCU lights up the corresponding LED light through the LED drive circuit to indicate that the line is in a power failure state, and at the same time, the main control MCU makes the electromagnetic lock main The circuit and the main circuit of the computer key are in the energized state, the electromagnetic lock is unlocked, and the computer key passes the electric test. The high-voltage equipment can realize the installation and maintenance of the high-voltage live display device without power failure.

As an improvement, the high-voltage live display device includes a cabinet, the cabinet includes a cabinet body and a door, the front of the cabinet body is open, and the door is hinged on the cabinet body and can cover the opening, so After the cover of the machine door is opened, it is sealed with the cabinet body, and the TVS tube, three-phase amplifying and filtering circuit, main control MCU, LED driving circuit and locking auxiliary circuit are all installed in the cabinet. Protective components.

As an improvement, the high-voltage charged display device includes a temperature and humidity sensor and a temperature and humidity adjustment circuit, the temperature and humidity adjustment circuit includes a temperature and humidity adjustment drive circuit and a temperature and humidity adjustment main circuit, and the output terminal of the temperature and humidity sensor is connected to the main control MCU The input end of the main control MCU is connected to the input end of the temperature and humidity adjustment drive circuit, and the output end of the temperature and humidity adjustment drive circuit is connected to the input end of the temperature and humidity adjustment main circuit. The temperature and humidity sensor collects the temperature signal and humidity signal in the cabinet, and the main control MCU collects, stores, calculates and analyzes the signal. When the temperature in the cabinet is too high, the temperature and humidity adjustment main circuit cools it. When the humidity is low or/and the humidity is too high, the temperature and humidity adjustment main circuit will heat it.

As an improvement, the main circuit for temperature and humidity adjustment includes a semiconductor cooling chip, the semiconductor cooling chip is arranged in the cabinet, and one end of the semiconductor cooling chip is fixed on the outer wall of the cabinet, and the other end faces the inside of the cabinet, and the main control MCU receives and According to the signal of the temperature and humidity sensor, the switching of the current direction on the semiconductor refrigeration chip is controlled. The main control MCU controls the end of the semiconductor cooling sheet facing the inside of the cabinet to cool or heat. When the temperature in the cabinet is too high, the semiconductor cooling sheet is cooling toward the end of the inside of the cabinet. When the temperature in the cabinet is too low or/and the humidity is too high, the semiconductor cooling sheet The end of the cooling fin facing the inside of the cabinet generates heat.

As an improvement, one end of the semiconductor cooling fin fixed on the cabinet is provided with a cooling fin. A heat sink is installed on the semiconductor cooling sheet to accelerate heat exchange, so that the end of the semiconductor cooling sheet facing the inside of the cabinet can achieve a significant cooling effect when the temperature of the cabinet is too high.

As an improvement, an opening is provided on the outer wall of the cabinet, the heat sink is fixed on the outer wall of the opening, the semiconductor cooling fin is arranged in the opening, and one end of the semiconductor cooling fin fixed on the cabinet is attached to the cooling fin. Through the cooperation of the cooling fins and the openings, the semiconductor cooling fins are fixed in the outer wall of the cabinet.

Beneficial effect:

After adopting the above-mentioned technical scheme, the invention discloses a high-voltage charged display device that monitors the leakage current of high-voltage equipment. The three-phase current sensor collects the leakage current signal of the three-phase high-voltage equipment, and the TVS tube clamps the potential at the time of lightning overvoltage (overcurrent). A certain voltage value prevents damage to the three-phase current sensor, which can effectively improve the anti-interference ability in harsh environments. The three-phase amplification and filter circuit amplifies and filters the signals collected by the three-phase current sensor, and the main control MCU collects and stores the signals. , calculation and analysis, when the leakage current signal of the high-voltage equipment is higher than the preset safety threshold of the main control MCU, the main control MCU lights up the corresponding LED light through the LED drive circuit, indicating that the line is in a live state, and at the same time through the locking drive circuit to make the electromagnetic The main circuit of the lock and the main circuit of the computer key are in the power-off state, the electromagnetic lock is locked, and the electric test of the computer key fails. Light up the corresponding LED lights to indicate that the circuit is in a power failure state. At the same time, the main circuit of the electromagnetic lock and the main circuit of the computer key are in the power-on state through the locking drive circuit. Realize the installation and maintenance of high-voltage live display devices.

Description of drawings

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of a high-voltage charged display device by monitoring the leakage current of high-voltage equipment;

FIG. 2 is a schematic structural diagram of the cabinet.

Detailed ways

As shown in Figure 1, a high-voltage charged display device monitors the leakage current of high-voltage equipment. The high-voltage charged display device includes a three-phase current sensor 1, a TVS tube 2, a three-phase amplification filter circuit 3, a main control MCU 4, and an LED drive circuit 51. , a locking drive circuit 61, a temperature and humidity sensor 7 and a temperature and humidity adjustment circuit, the three-phase current sensor 1 is a through-hole current sensor, and the lower lead wire of the high-voltage equipment passes through the middle of the three-phase current sensor 1, avoiding adjacent cables Influenced by the electric field, it can reliably and accurately indicate the electrified state of the measured line or equipment, and eliminate misoperation and refusal to operate. The LED circuit includes an LED drive circuit 51 and an LED main circuit 52. The main circuit 62 and the computer key main circuit 63, the temperature and humidity adjustment circuit includes a temperature and humidity adjustment drive circuit 81 and a temperature and humidity adjustment main circuit 82, the output end of the three-phase current sensor 1 is connected to the input end of the TVS tube 2, and the three-phase amplification filter The input end of the circuit 3 is connected, the output end of the three-phase amplifying filter circuit 3, the output end of the temperature and humidity sensor 7 are respectively connected with the input end of the main control MCU4, and the output end of the main control MCU4 is respectively connected with the input end of the LED drive circuit 51, The input end of the lock drive circuit 61 is connected with the temperature and humidity adjustment drive circuit 81, the output end of the LED drive circuit 51 is connected with the input end of the LED main circuit 52, and the output end of the lock drive circuit 61 is connected with the input end of the electromagnetic lock main circuit 62 respectively. 1. The input end of the computer key main circuit 63 is connected, and the output end of the humidity adjustment drive circuit is connected with the input end of the temperature and humidity adjustment main circuit 82. The temperature and humidity adjustment main circuit 82 includes a semiconductor cooling chip 821, and the main control MCU4 receives and controls the temperature and humidity according to the temperature and humidity. The signal from the sensor 7 controls the switching of the current direction on the peltier 821 .

As shown in Figure 2, the high-voltage live display device includes a cabinet, the cabinet includes a cabinet body 91 and a door 92, the front of the cabinet body 91 is open, and the door 92 is hinged on the cabinet body 91 and can cover the opening. After the door 92 is covered and opened, it is sealed and matched with the cabinet body 91. The inner side of the door 92 is provided with a sealing ring. , three-phase amplifying filter circuit 3, main control MCU 4, LED circuit, locking drive circuit 61, temperature and humidity sensor 7 and temperature and humidity adjustment circuit are all installed in the cabinet. The semiconductor cooling plate 821 is arranged in the cabinet and one end of the semiconductor cooling plate 821 is fixed on the outer wall of the cabinet, and the other end faces the inside of the cabinet. Opening, the cooling fin 822 is fixed on the outer wall of the opening, the semiconductor cooling fin 821 is arranged in the opening and the end of the semiconductor cooling fin 821 fixed on the cabinet is attached to the cooling fin 822 .

Except above-mentioned preferred embodiment, the present invention also has other embodiments, and those skilled in the art can make various changes and deformations according to the present invention, as long as they do not depart from the spirit of the present invention, all should belong to the scope defined in the appended claims of the present invention scope.

Claims (6)

1. A high-voltage charged display device by monitoring the leakage current of high-voltage equipment, characterized in that: the high-voltage charged display device includes a three-phase current sensor, a TVS tube, a three-phase amplification filter circuit, a main control MCU, an LED circuit and a locking circuit , the LED circuit includes an LED driver circuit and an LED main circuit, the locking circuit includes a locking driver circuit, an electromagnetic lock main circuit and a computer key main circuit, and the output terminals of the three-phase current sensor are respectively connected to the input terminals of the TVS tube, The input end of the three-phase amplifying and filtering circuit is connected, the output end of the three-phase amplifying and filtering circuit is connected with the input end of the main control MCU, and the output end of the main control MCU is respectively connected with the input end of the LED driving circuit and the locking driving circuit. The input end is connected, the output end of the LED driving circuit is connected with the input end of the LED main circuit, and the output end of the locking driving circuit is respectively connected with the input end of the electromagnetic lock main circuit and the input end of the computer key main circuit. 2. A high-voltage live display device for monitoring the leakage current of high-voltage equipment according to claim 1, wherein the high-voltage live display device includes a cabinet, and the cabinet includes a cabinet body and a door, and the cabinet body The front part of the cabinet is open, the door is hinged on the cabinet body and can cover the opening, the door cover is sealed with the cabinet body after being opened, the TVS tube, three-phase amplifying filter circuit, main The control MCU, LED circuit and locking drive circuit are all installed in the cabinet. 3. A high-voltage charged display device for monitoring the leakage current of high-voltage equipment according to claim 2, wherein the high-voltage charged display device includes a temperature and humidity sensor and a temperature and humidity adjustment circuit, and the temperature and humidity adjustment circuit includes The temperature and humidity adjustment drive circuit and the temperature and humidity adjustment main circuit, the output end of the temperature and humidity sensor is connected to the input end of the main control MCU, the output end of the main control MCU is connected to the input end of the temperature and humidity adjustment drive circuit, and the The output end of the temperature and humidity adjustment driving circuit is connected with the input end of the temperature and humidity adjustment main circuit. 4. A high-voltage charged display device for monitoring the leakage current of high-voltage equipment according to claim 3, characterized in that: the temperature and humidity adjustment main circuit includes a semiconductor cooling chip, the semiconductor cooling chip is arranged in the cabinet and the semiconductor cooling chip One end of the refrigerating sheet is fixed on the outer wall of the cabinet, and the other end faces the inside of the cabinet. The main control MCU receives and controls the switching of the current direction on the semiconductor refrigerating sheet according to the signal of the temperature and humidity sensor. 5. A high-voltage charged display device for monitoring the leakage current of high-voltage equipment according to claim 4, characterized in that: the end of the semiconductor cooling plate fixed on the cabinet is provided with a heat sink. 6. A high-voltage charged display device for monitoring the leakage current of high-voltage equipment according to claim 5, characterized in that: the outer wall of the cabinet is provided with an opening, and the heat sink is fixed on the outer wall of the opening, so that The semiconductor refrigerating sheet is arranged in the opening, and one end of the semiconductor refrigerating sheet fixed on the cabinet is attached to the heat sink.