High-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation

Abstract

The utility model relates to a high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation. The high-voltage power distribution cabinet is characterized by comprising a monitoring chamber and a high-voltage chamber, an intelligent monitoring device and a microcomputer protection device are installed in the monitoring chamber, an instrument chamber is installed in the high-voltage chamber, and an incoming cable, a temperature sensor, a power voltage transformer, a current transformer, a partial discharge sensor, a vacuum circuit breaker and an outgoing cable are installed in the high-voltage chamber. The temperature sensor is installed on an incoming cable, and the temperature sensor is connected with the intelligent monitoring device and the microcomputer protection device to form a temperature monitoring circuit. The partial discharge sensor is connected to the main loop, and the partial discharge sensor is connected with the intelligent monitoring device and the microcomputer protection device to form a partial discharge monitoring circuit; the current transformer, the microcomputer protection device and the vacuum circuit breaker are connected to form a current monitoring loop, real-time monitoring protection is carried out on the temperature and insulativity of high-voltage power distribution cabinet equipment, the functions of voltage and current monitoring and overcurrent and voltage protection are achieved, the circuit is simplified, and safe operation is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of high-voltage side power distribution, in particular to a high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation. Background Art

[0002] High-voltage distribution cabinets play the role of switching, controlling or protecting in the power generation, transmission, distribution, power conversion and consumption of the power system. The electrical products with voltage levels of 3-35kV to 550kV mainly include high-voltage disconnectors and grounding switches, high-voltage load switches, high-voltage automatic reclosers and sectionalizers, high-voltage operating mechanisms, high-voltage switch cabinets, etc. High-voltage switch cabinets are indoor metal-clad center-mounted removable switchgear, and are three-phase AC 50Hz indoor complete power distribution devices. They are mainly used to receive and distribute 3-12 kV network power and implement control, protection and monitoring of circuits. High-voltage distribution cabinets are needed to control users. In the prior art, switch cabinets are configured for high-voltage side electrical equipment with an input power supply of 10kv. A high-voltage incoming line cabinet and a high-voltage outgoing line cabinet are generally used in combination to monitor the voltage and current of the main circuit of the high-voltage switch cabinet and to provide overcurrent and voltage protection. At the same time, there are also other faults in the high-voltage switch cabinet that may affect the safe operation of the user's power grid, such as line insulation status monitoring caused by excessive humidity in the cabinet, and temperature rise of electrical components and cables in the cabinet caused by long-term operation of the high-voltage switch cabinet. These are all problems that need to be effectively monitored and solved. Summary of the invention

[0003] The problem to be solved by the utility model is that the existing high-voltage switchgear of dedicated transformer users lacks the monitoring of the voltage and current of the main circuit of the high-voltage switchgear, which affects the safe operation of the power grid with overcurrent and voltage protection functions, as well as the insulation status of the lines in the cabinet and the temperature rise of the cables during long-term operation. A high-voltage power distribution cabinet with wireless temperature and insulation monitoring is provided. The intelligent monitoring device and microcomputer protection device monitor and protect the temperature and insulation of the high-voltage switchgear equipment in real time, monitor the voltage and current of the high-voltage power switchgear and the overcurrent and voltage protection functions, simplify the lines, and ensure safe operation.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation, mainly the cabinet includes a monitoring room and a high-voltage room;

[0005] The monitoring room is equipped with an intelligent monitoring device, a microcomputer protection device, and an instrument room, and the intelligent monitoring device is connected to the microcomputer protection device;

[0006] The high voltage room is equipped with an incoming cable, a temperature sensor, a power supply voltage transformer, a current transformer, a partial discharge sensor, a vacuum circuit breaker, and an outgoing cable;

[0007] The incoming cable, current transformer, vacuum circuit breaker and outgoing cable are connected by copper busbars to form a main circuit;

[0008] The temperature sensor is installed on the incoming cable, and the temperature sensor is connected with the intelligent monitoring device and the microcomputer protection device to form a temperature monitoring circuit;

[0009] The partial discharge sensor is connected to the main circuit copper busbar, and the partial discharge sensor is connected to the intelligent monitoring device and the microcomputer protection device to form a partial discharge monitoring circuit;

[0010] The intelligent monitoring device includes a receiving host and a wireless sensor; the microcomputer protection device includes a chip single chip microcomputer, a CPU and a relay.

[0011] Preferably, the current transformer, microcomputer protection device and vacuum circuit breaker are connected to form a current monitoring loop.

[0012] Preferably, the power supply voltage transformer is connected to the main circuit.

[0013] The advantages and positive effects of the utility model are:

[0014] 1. The utility model is a high-voltage power distribution cabinet that can wirelessly monitor temperature and insulation. Due to the installation of an intelligent monitoring device, the temperature sensor is installed on the incoming cable. The temperature sensor is connected with the intelligent monitoring device and a microcomputer protection device to form a temperature monitoring circuit. The partial discharge sensor is connected to the main circuit copper bus. The partial discharge sensor is connected with the intelligent monitoring device and a microcomputer protection device to form a partial discharge monitoring circuit. The intelligent monitoring device receives the sensor signal from the host and transmits it to the microcomputer protection device, displays the current cable temperature and the partial discharge of the main circuit in the cabinet, judges the current temperature and insulation status, so as to eliminate the faults of the components in the cabinet in time, realize the protection functions of temperature monitoring and insulation status monitoring of the line, and ensure the safe operation of the high-voltage switch cabinet.

[0015] 2. The utility model is a high-voltage power distribution cabinet that can wirelessly monitor temperature and insulation. Since the power supply voltage transformer is connected to the main circuit copper bus, the power supply voltage transformer converts the 10kV voltage of the power supply line into a 220V working voltage that can be used for the vacuum circuit breaker, intelligent monitoring device, microcomputer protection device, instrument room, etc. in the cabinet.

[0016] 3. The utility model is a high-voltage power distribution cabinet that can wirelessly monitor temperature and insulation. Since the current transformer is connected to the microcomputer protection device, the other end of the current transformer is connected to the high-voltage switch main circuit composed of the incoming cable, the metering current transformer, the vacuum circuit breaker, and the outgoing cable. The current transformer samples the current of the main circuit 10kv and monitors the change of the current. If the current exceeds the set specified value, a tripping command is issued to the vacuum circuit breaker to cut off the vacuum circuit breaker, so as to protect the electrical equipment after the outgoing end, simplify the line, and reduce labor costs.

[0017] 4. The utility model is a high-voltage power distribution cabinet that can wirelessly monitor temperature and insulation. Due to the use of intelligent monitoring devices and microcomputer protection devices, it performs dual functions of monitoring and protecting high-voltage switch cabinets and outgoing line equipment. The sampling current provided by the current transformer monitors that the current exceeds the set specified value, and the monitoring protection device sends a tripping command to the vacuum circuit breaker to cut off the vacuum circuit breaker. The temperature sensor exceeds the setting and is immediately fed back to the intelligent monitoring device. The local discharge of the local amplification sensor exceeds the set value and is immediately fed back to the intelligent monitoring device, thereby protecting high-voltage electrical equipment, simplifying lines, reducing labor costs, and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the internal structure circuit of a high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation.

[0019] 1- monitoring room, 2- intelligent monitoring device, 3- microcomputer protection device, 4- instrument room, 5- vacuum circuit breaker, 6- sensor, 7- live display, 8- outgoing cable, 9- temperature sensor, 10- incoming cable, 11- lightning arrester, 12- current transformer, 13- partial discharge sensor, 14- power supply voltage transformer, 15- high voltage room. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to specific embodiments.

[0021] like Figure 1 As shown, a high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation, wherein the cabinet body is divided into a monitoring room and a high-voltage room 15, wherein an instrument room 4 is installed in the monitoring room, and the monitoring room is arranged at the upper end of the front face of the cabinet body, and an observation window is provided in the cabinet door at the upper end of the front face of the cabinet body; the high-voltage room 15 is located behind and at the lower end of the monitoring room, and the monitoring room and the high-voltage room 15 are separated by a partition and both are kept grounded, and the outer shell and the partition of the switch cabinet are made of aluminum-zinc coated steel plates.

[0022] Monitoring room: Intelligent detection device 2, microcomputer protection device 3 and instrument room 4 are installed in the monitoring room.

[0023] The intelligent detection device 2 is composed of a receiving host and a wireless sensor. The microcomputer protection device 3 is composed of a chip single chip microcomputer, a CPU and a relay.

[0024] In the high-voltage chamber 15: a series of electrical components including an incoming cable 10, a temperature sensor 9, a power supply voltage transformer 14, a current transformer 12, a partial discharge sensor 13, a vacuum circuit breaker 5, a sensor 6, an outgoing cable 8, a lightning arrester 11, and a live display 7 are installed in the high-voltage chamber 15; the incoming cable 10 is connected to the lower end of the current transformer 12, the upper end of the current transformer 12 is connected to the upper end of the vacuum circuit breaker 5, and the lower end of the vacuum circuit breaker 5 is connected to the outgoing cable 8; the incoming cable 10, the current transformer 12, the vacuum circuit breaker 5, and the outgoing cable 8 are connected by copper busbars to form a main circuit; the upper end of the power supply voltage transformer 14 is connected to the main circuit copper busbar through a fuse; the sensor 6 is connected to the live display 7.

[0025] The current transformer 12 is connected to the microcomputer protection device 3, and the microcomputer protection device 3 is connected to the vacuum circuit breaker 5 to form a current monitoring loop.

[0026] The temperature sensor 9 is installed on the incoming cable 10, and the temperature sensor 9 is connected with the intelligent detection device 2 and the microcomputer protection device 3 to form a temperature monitoring circuit; the partial discharge sensor 13 is connected to the main circuit copper bar, and the partial discharge sensor 13 is connected with the intelligent detection device 2 and the microcomputer protection device 3 to form a partial discharge monitoring circuit. A door is provided on the instrument room 4, and a switch-on and switch-off button is installed on the door, and the switch-on and switch-off button is connected to the vacuum circuit breaker 5.

[0027] When the high-voltage distribution cabinet capable of wirelessly monitoring temperature and insulation is working, when the incoming cable 10 inputs the 10kV voltage main circuit of the power supply, the power voltage transformer 14 is connected to the main circuit copper busbar to convert the 10kV voltage of the power supply line into a 220V working voltage that can be used for the vacuum circuit breaker 5, indicator light, intelligent detection device 2, and microcomputer protection device 3 in the cabinet; the live display 7 determines whether the 10kV incoming line is energized by collecting the output voltage of the 10kV main circuit sensor 6, and the opening and closing indicator light displays the opening and closing status of the vacuum circuit breaker 5.

[0028] In the high-voltage chamber 15, the temperature sensor 9 sends the temperature signal of the incoming cable 10 to the intelligent detection device 2, and the intelligent detection device 2 receives the temperature signal received by the host and sends it to the microcomputer protection device 3 wirelessly, that is, the intelligent detection device 2 monitors the temperature of the cable in the high-voltage chamber 15 through the temperature sensor 9, and the chip microcomputer and CPU of the microcomputer protection device 3 receive and process the signal, and the monitoring temperature exceeds the set specified value, and the microcomputer protection device 3 issues a trip command to the vacuum circuit breaker 5 to cut off. The intelligent detection device 2 monitors the insulation of the main circuit copper bar through the partial discharge sensor 13, and sends it to the microcomputer protection device 3 wirelessly. The microcomputer protection device 3 receives and processes the signal, monitors the partial discharge exceeding the set specified value, and the microcomputer protection device 3 issues a trip command to the vacuum circuit breaker 5 to cut off. Through the sampling current provided by the current transformer 12, the microcomputer protection device 3 monitors that the current exceeds the set specified value, and the microcomputer protection device 3 issues a trip command to the vacuum circuit breaker 5 to cut off the vacuum circuit breaker 5. The intelligent detection device 2 and the microcomputer protection device 3 respectively perform real-time monitoring and protection on the temperature and insulation of the high-voltage switch cabinet and the outgoing line equipment.

[0029] The above embodiments of the utility model are described in detail, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the utility model should still fall within the scope of this patent.

Claims

1. A high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation, characterized in that: The cabinet includes a monitoring room and a high-voltage room; The monitoring room is equipped with an intelligent monitoring device, a microcomputer protection device, and an instrument room, and the intelligent monitoring device is connected to the microcomputer protection device; The high voltage room is equipped with an incoming cable, a temperature sensor, a power supply voltage transformer, a current transformer, a partial discharge sensor, a vacuum circuit breaker, and an outgoing cable; The incoming cable, current transformer, vacuum circuit breaker and outgoing cable are connected by copper busbars to form a main circuit; The temperature sensor is installed on the incoming cable, and the temperature sensor is connected with the intelligent monitoring device and the microcomputer protection device to form a temperature monitoring circuit; The partial discharge sensor is connected to the main circuit, and the partial discharge sensor is connected with the intelligent monitoring device and the microcomputer protection device to form a partial discharge monitoring circuit; The intelligent monitoring device includes a receiving host and a wireless sensor; the microcomputer protection device includes a chip single chip microcomputer, a CPU and a relay.

2. A high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation according to claim 1, characterized in that: The current transformer, microcomputer protection device and vacuum circuit breaker are connected to form a current monitoring loop.

3. A high-voltage power distribution cabinet capable of wirelessly monitoring temperature and insulation according to claim 1, characterized in that: The power supply voltage transformer is connected to the main circuit.

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