High-voltage switch cabinet capable of being monitored

Abstract

The utility model relates to a monitorable high-voltage switch cabinet. The monitorable high-voltage switch cabinet is characterized by comprising a metering chamber and a high-voltage chamber, a microcomputer protection device, a terminal, an electric energy meter and an opening button are arranged in the metering chamber; a power mutual inductor, a sensor, a metering current mutual inductor, a metering voltage mutual inductor and a vacuum circuit breaker are arranged in the high-voltage chamber; the vacuum circuit breaker is connected with a microcomputer protection device, a terminal, a terminal and an opening button; one end of the power transformer is connected to the vacuum circuit breaker, and the other end of the power transformer is connected to the microcomputer protection device and the electromagnetic lock; one end of the metering voltage transformer is connected to the vacuum circuit breaker, and the other end of the metering voltage transformer is connected to the electric energy meter and the terminal to form a monitoring voltage line; one end of the metering current transformer is connected to the vacuum circuit breaker, and the other end of the metering current transformer is connected to the microcomputer protection device and the electric energy meter to form a current monitoring circuit; according to the high-voltage switch cabinet, the monitoring and protecting functions of the high-voltage switch cabinet are achieved, lines are simplified, labor cost is reduced, and operation is safe.

Description

Technical Field

[0001] The utility model belongs to the field of high - voltage side power distribution, and particularly relates to a high - voltage switch cabinet that can be monitored. Background Art

[0002] High - voltage switch cabinets play roles such as switching on and off, controlling, or protecting in the processes of power generation, power transmission, power distribution, power conversion, and power consumption in the power system. Electrical products with voltage levels from 3 - 35 kV to 550 kV mainly include high - voltage disconnectors and earthing switches, high - voltage load switches, high - voltage automatic reclosing and sectionalizers, high - voltage operating mechanisms, high - voltage switch cabinets, etc. The indoor metal - clad medium - placed withdrawable switchgear for high - voltage side electrical equipment is a three - phase AC 50 Hz indoor complete power distribution device, mainly used for receiving and distributing network electric energy of 3 - 12 kV and implementing control, protection, and monitoring of the circuit. A large number of high - voltage switch cabinets are required to control users. In the prior art, for the switch cabinets configured for high - voltage side electrical equipment with an input voltage of 10 kV, a series of components are generally installed on the door of the instrument room. All are manual operations of knobs, indicator lights, ammeter circuits, etc. The components are scattered and the wiring is complex, wasting labor and being troublesome to install. Especially, there are defect problems in the control and use functions of high - voltage switch cabinets, lacking voltage and current monitoring of the main circuit of high - voltage switch cabinets and over - current and over - voltage protection functions, which are likely to cause high - voltage cabinet failures and affect the safe operation of the power grid. These are all problems that need to be solved urgently. Summary of the Invention

[0003] The problems to be solved by the utility model are that the switch cabinets configured for high - voltage electrical equipment of existing special transformer users have complex circuits, waste labor and costs, lack voltage and current monitoring, over - current, and over - voltage protection functions, and user - side failures affect the safe operation of the power grid, etc. The utility model provides a high - voltage switch cabinet that can be monitored, simplifies the high - voltage electrical switch cabinet equipment, realizes the protection function of monitoring the high - voltage switch cabinet, simplifies the circuit, reduces labor costs, and operates safely.

[0004] To solve the above - mentioned technical problems, the technical solution adopted by the utility model is: a high - voltage switch cabinet that can be monitored, mainly including a metering room and a high - voltage room;

[0005] A microcomputer protection device, a terminal, an electric energy meter, and a tripping button are installed in the metering room; the microcomputer protection device includes a chip single - chip microcomputer, a CPU, and a relay;

[0006] A power supply transformer, a sensor, a metering current transformer, a metering voltage transformer, a vacuum circuit breaker, and a live display are installed in the high - voltage room;

[0007] The vacuum circuit breaker is connected to the microcomputer protection device, the terminal, and the tripping button;

[0008] One end of the power transformer is connected to the vacuum circuit breaker, and the other end of the power transformer is connected to the microcomputer protection device and the electromagnetic lock;

[0009] One end of the metering voltage transformer is connected to the vacuum circuit breaker, and the other end of the metering voltage transformer is connected to the electric energy meter and the terminal to form a monitoring voltage line;

[0010] One end of the metering current transformer is connected to the vacuum circuit breaker, and the other end of the metering current transformer is connected to the microcomputer protection device and the electric energy meter to form a monitoring current line;

[0011] The incoming cable, the metering current transformer, the vacuum circuit breaker, and the outgoing cable are connected to form the main circuit of the high-voltage switch.

[0012] Preferably, the sensor is connected to the live display.

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

[0014] 1. Since the present utility model is a high-voltage switch cabinet that can be monitored, a monitoring voltage line formed by connecting a metering voltage transformer to an electric energy meter and a terminal is adopted, and it is connected to the main circuit of the high-voltage switch formed by the incoming cable, the metering current transformer, the vacuum circuit breaker, and the outgoing cable. The metering voltage transformer converts the 10 kV voltage of the power supply line into 100 V voltage that can be used by the electric energy meter and the terminal. The electric energy meter measures the load current and voltage at the user's incoming line end to obtain the user's power and electricity consumption. When overloaded or excessive, the 10 kV line can be cut off, and the vacuum circuit breaker controls the opening and closing buttons to prevent the user-side fault from affecting the safe operation of the power grid.

[0015] 2. Since the present utility model is a high-voltage switch cabinet that can be monitored, a monitoring current circuit formed by connecting a metering current transformer to a microcomputer protection device and an electric energy meter is adopted, and it is connected to the main circuit of the high-voltage switch formed by the incoming cable, the metering current transformer, the vacuum circuit breaker, and the outgoing cable. The metering current transformer samples the current of the 10 kV main circuit and monitors the change of the current. When it exceeds the set specified value, a tripping command is sent to the vacuum circuit breaker to cut off the vacuum circuit breaker, so as to protect the electrical equipment after the outgoing line end, simplify the circuit, and reduce the labor cost.

[0016] 3. Since the present utility model is a high-voltage switch cabinet that can be monitored, a main circuit monitoring line of the vacuum circuit breaker, the microcomputer protection device and the terminal is adopted to protect the equipment at the outgoing line end. Through the sampled current provided by the metering current transformer, when the monitored current exceeds the set specified value, the monitoring and protection device sends a tripping command to the vacuum circuit breaker to cut off the vacuum circuit breaker to protect the electrical equipment at the outgoing line end.

[0017] 4. The high-voltage switch cabinet with monitoring function of the present utility model adopts a power transformer, which can convert the 10kV voltage of the main power supply line into a 220V working voltage, providing power for the vacuum circuit breaker, indicator light, electromagnetic lock, and microcomputer protection device inside the cabinet, simplifying the circuit, reducing labor costs, and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Side view schematic diagram of the structural circuit of a high-voltage switch cabinet with monitoring function of the present utility model;

[0019] Figure 2 Front view schematic diagram of a high-voltage switch cabinet with monitoring function of the present utility model.

[0020] 1 - Metering room, 2 - Electric energy meter, 3 - Terminal, 4 - Microcomputer protection device, 5 - Shutdown button, 6 - Vacuum circuit breaker, 7 - Electromagnetic lock, 8 - Live display, 9 - Sensor, 10 - Metering current transformer, 11 - Fuse, 12 - Metering voltage transformer, 13 - Power transformer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described in detail below in conjunction with specific embodiments.

[0022] As Figure 1 , 2 shown, a high-voltage switch cabinet with monitoring function, the cabinet body is divided into a metering room 1 and a high-voltage room. The metering room 1 is arranged at the upper end of the front of the cabinet body, and an observation window is opened on the cabinet door at the upper end of the front of the cabinet body; the back and lower end of the metering room 1 are the high-voltage room. The metering room 1 and the high-voltage room are separated by a partition board and are both grounded. The shell and partition board of the switch cabinet are made of aluminized zinc steel plates.

[0023] A microcomputer protection device 4, a terminal 3, and an electric energy meter 2 are installed in the metering room 1; the microcomputer protection device 4 is mainly composed of a chip microcontroller, a CPU, a relay, etc.

[0024] The incoming cable enters the high-voltage chamber from the lower end of the cabinet. In the high-voltage chamber, sensors 9, metering current transformers 10, metering voltage transformers 12, power transformers 13, vacuum circuit breakers 6, and live-line indicators 8 are installed. The incoming cable is connected to the metering current transformer 10, vacuum circuit breaker 6, and outgoing cable to form the main circuit of the high-voltage switch. The outgoing cable exits the high-voltage chamber. One end of the metering voltage transformer 12 is connected to the vacuum circuit breaker 6 through a fuse 11, and the other end of the metering voltage transformer 12 is connected to the watt-hour meter 2 and the terminal 3 to form a monitoring voltage line; one end of the metering current transformer 10 is connected to the vacuum circuit breaker 6, and the other end of the metering current transformer 10 is connected to the microcomputer protection device 4 and the watt-hour meter 2 to form a monitoring current line. One end of the power transformer 13 is connected to the vacuum circuit breaker 6 through a fuse 11, and the other end of the power transformer 13 is connected to the microcomputer protection device 4 and the electromagnetic lock 7. The vacuum circuit breaker 6 is connected to the terminal 3 and the opening button 5; the sensor 9 is connected to the live-line indicator 8.

[0025] When the high-voltage switchgear is working and the incoming cable inputs a 10 kV supply voltage to the main circuit, the power transformer 13 converts the 10 kV supply voltage of the supply line into a 220 V working voltage for the vacuum circuit breaker 6, indicator lights, electromagnetic lock 7, and microcomputer protection device 4 inside the cabinet to operate; after the 10 kV incoming cable is energized, the sensor 9 outputs 24 V to the live-line indicator 8, and the power indicator light on the live-line indicator 8 lights up to indicate that the incoming cable is energized.

[0026] On the main circuit, the sensor 9 converts the 10 kV supply voltage of the supply line into a 24 V working voltage for the live-line indicator 8 inside the cabinet; the metering current transformer 10 on the main circuit provides sampling current for the watt-hour meter 2 and the microcomputer protection device 4. The microcomputer protection device 4 monitors the change of the sampling current. The chip and integrated circuit of the microcomputer protection device 4 are pre-set with a current set value, and the sampling current value fluctuates within a range. When it exceeds the set value, a tripping command is sent to the vacuum circuit breaker 6 on the main circuit. The vacuum circuit breaker 6 will cut off the 10 kV line to protect the equipment at the outgoing end, and it is used in combination with the microcomputer protection device 4, the negative control terminal 3, and the opening button 5 on the door.

[0027] At the same time, the metering voltage transformer 12 converts the 10 kV supply voltage of the supply line into a 100 V voltage for the watt-hour meter and the terminal 3 to use. The watt-hour meter 2 detects the electrical energy and calculates the power, and the 100 V voltage terminal on the terminal 3. The terminal 3 collects the data of the metering watt-hour meter 2 and sends the data to the monitoring platform of the power company to monitor the load at the user's outgoing end. When overloaded, the monitoring platform directly sends a tripping command to the terminal 3, and the terminal 3 controls the vacuum circuit breaker 6 to trip; when the 10 kV line is over-voltage, the lightning arrester provides over-voltage protection for this cabinet; the watt-hour meter 2 calculates the user's power and electricity consumption by measuring the load current and voltage at the user's incoming end. The power company charges the user's electricity bill based on the electricity consumption of the user on the watt-hour meter 2.

[0028] The embodiments of the present utility model have been described in detail above, but the above content is only the preferred embodiments of the present utility model and should not be considered as limiting the scope of implementation of the present utility model. Any equivalent changes and improvements made within the scope of the present utility model should still fall within the scope covered by this patent.

Claims

1. A monitorable high-voltage switch cabinet, characterized in that: The high-voltage switchgear includes a metering room, a high-voltage room, an incoming cable, and an outgoing cable; The metering room is equipped with a microcomputer protection device, a terminal, an electric energy meter, and a trip button; the microcomputer protection device includes a chip single chip microcomputer, a CPU, and a relay; The high voltage room is equipped with power transformer, sensor, metering current transformer, metering voltage transformer, vacuum circuit breaker and live display; The vacuum circuit breaker is connected to a microcomputer protection device, a terminal, and a trip button; One end of the power transformer is connected to a vacuum circuit breaker, and the other end of the power transformer is connected to a microcomputer protection device and an electromagnetic lock; One end of the metering voltage transformer is connected to the vacuum circuit breaker, and the other end of the metering voltage transformer is connected to the electric energy meter and the terminal to form a monitoring voltage circuit; One end of the metering current transformer is connected to the vacuum circuit breaker, and the other end of the metering current transformer is connected to the microcomputer protection device and the electric energy meter to form a monitoring current circuit; The incoming cable, the metering current transformer, the vacuum circuit breaker and the outgoing cable are connected to form a main circuit of the high-voltage switch.

2. A monitorable high-voltage switch cabinet according to claim 1, characterized in that: The sensor is connected to a power display.

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