What does a high voltage circuit breaker do? What is the function of a high voltage circuit breaker

The role of the high-voltage circuit breaker:

The electrical energy can be reasonably distributed, and the electric equipment can be started to protect the current. However, when the current load is too large or a short circuit occurs, the current is automatically cut off to reduce the fault range. In addition, after the fault current is cut off, there is no need to replace the parts, which is more convenient to use.

The high-voltage circuit breaker can not only cut off and turn on the no-load current and load current in the high-voltage circuit under normal conditions, but also cooperate with the protection device and automatic device in the event of a system failure, quickly cut off the fault power supply, prevent the accident from expanding, and ensure the safe operation of the system.

The main function of the circuit breaker is to break and turn on the circuit (including breaking and turning on the normal current and breaking the short-circuit current).

The circuit breaker can not only turn on and off the normal load current, but also withstand the short-circuit current for a certain period of time (several times or even dozens of times the normal working current), and can cut off the short-circuit current and cut off the faulty lines and equipment.

Protect the safety of the use of electrical equipment behind the circuit breaker.

The place where the vacuum circuit breaker is used will inevitably use the microcomputer protection device, the microcomputer protection device is the relay protection composed of the microcomputer, is the development direction of the relay protection of the power system, it has high reliability, high selectivity, high sensitivity, the microcomputer protection device hardware includes the microprocessor (single-chip microcomputer) as the core, with input, output channels, man-machine interface and communication interface. The system is widely used in electric power, petrochemical, mining and smelting, railways and civil buildings.

Merit. 1) Microcomputer protection device [3] is a high-tech product of power automation that integrates measurement, control, monitoring, protection, communication and other functions, and is an ideal electrical unit that constitutes an intelligent switchgear.

2) The high integration of multiple functions, flexible configuration, and friendly man-machine interface make the general-purpose microcomputer comprehensive protection device can be used as the protection and measurement and control of various types of electrical equipment and lines of various electrical equipment and lines of 35kV and below voltage levels of 35kV and below, small resistance grounding system, arc suppression coil grounding system, and direct grounding system, and can also be used as the protection and measurement and control of the voltage and current of the system in some 66kV and 110kV voltage levels.

3) The 32-bit digital signal processor (DSP) has the advantages of advanced core structure, high-speed computing power and real-time signal processing.

4) Support conventional RS485 bus and CAN (DeviceNet) fieldbus communication, CAN bus has error correction mechanisms such as automatic retransmission of wrong posts and automatic detachment of fault nodes to protect the implementation and reliability of information.

5) Perfect self-check ability, automatic alarm when the device is found to be abnormal; It has the ability of self-protection, which can effectively prevent permanent damage to the device caused by wiring errors and abnormal operation; The maintenance-free design does not require the sampling accuracy to be adjusted in the field, and the measurement accuracy will not increase due to environmental changes and long-term operation.

The high-voltage circuit breaker is the most important control and protection equipment in power plants, substations and power systems

1) Control effect. According to the needs of the operation of the power system, part or all of the electrical equipment, as well as part or all of the lines, will be put into operation or withdrawn.

2) Protective. When a certain part of the power system fails, it cooperates with the protection device and automatic device to quickly remove the fault part from the system, reduce the scope of power failure, prevent the expansion of accidents, protect all kinds of electrical equipment in the system from damage, and ensure the safe operation of the trouble-free part of the system.

3) Arc extinguishing. The high-voltage circuit breaker can not only reliably interrupt the no-load current and load current, but also reliably interrupt the short-circuit current.

In the high-voltage circuit, during normal operation, the cut-off of the load current and the cut-off of the short-circuit current in the event of a fault play a role in control and protection. Due to the high working voltage and large current, the arc is generally not easy to extinguish, and it must be completed with a high-voltage circuit breaker.

The role of the high-voltage circuit breaker:

The function of the circuit breaker is to cut off and turn on the load circuit, as well as cut off the fault circuit, to prevent the expansion of the accident and ensure safe operation. The high-voltage punch wide circuit breaker should break the arc of 1500V and the current is 1500-2000A, and these arcs can be stretched to 2m and continue to burn without extinguishing.

When there is a short circuit, the magnetic field generated by the high current (generally 10 to 12 times) overcomes the reaction spring, the tripper pulls the operating mechanism to act, and the switch trips instantaneously. When overloaded, the current becomes larger, the heat generation intensifies, and the bimetal sheet deforms to a certain extent to push the mechanism to act (the larger the current, the shorter the action time).

Therefore, the high-voltage circuit breaker can play a protective role in the power system.

The role of the high-voltage circuit breaker:

1) Control effect. Depending on the needs of the power system, part or all of the electrical equipment, as well as part or all of the lines, will be put into operation or withdrawn from operation.

2) Protective. When a certain part of the power system fails, it cooperates with the protection device and automatic device to quickly remove the fault part from the system, reduce the scope of power failure, prevent the expansion of the accident, protect all kinds of electrical equipment in the system from damage, and ensure the safe operation of the fault-free part of the system.

General principles for the selection of high-voltage circuit breakers.

In order to ensure the safety of high-voltage electrical appliances in normal operation, maintenance, short circuit and overvoltage, high-voltage electrical appliances should be selected according to the following conditions:

1. According to the normal working conditions, including voltage, current, frequency, mechanical load, etc.

2. According to the short-circuit conditions, including short-time withstand current, peak withstand current, closing and breaking current, etc.

3. According to environmental conditions, including temperature, humidity, altitude, etc.

4. According to the registered Li Zheng's voltage capacity, including the level of insulation, etc.

5. According to the different characteristics of various high-voltage electrical appliances, including the operation performance of the switch, the protection characteristics of the fuse, the load and accuracy level of the transformer, etc.

The above content refers to Encyclopedia - High Voltage Circuit Breaker.

For ordinary people, because they have not been in contact with the construction problems of high-voltage lines, they do not know much about high-voltage circuit breakers, in fact, high-voltage circuit breakers are very important in high-voltage lines. So what exactly is a high-voltage circuit breaker? What does it do?

Today, I will take you to really understand the definition of high-voltage circuit breaker.

1. What is a high-voltage circuit breaker?

The main function of the high-voltage circuit breaker is to cut off the load current in the high-voltage line, for example, when the high-voltage line fails, the high-voltage circuit breaker will automatically cut off the power, which can play a protective role to avoid the phenomenon of burning the high-voltage line.

Second, how to buy a high-voltage circuit breaker.

1. Select according to voltage, current, frequency and load.

2. Select according to the conditions of short circuit, such as the withstand current and the breaking current.

3. Choose according to temperature, humidity and height.

4. Select according to voltage bearing capacity and insulating material.

3. What are the characteristics of high-voltage circuit breakers?

1. When operating, it can be operated by electric or manual.

2. It is very suitable for voltage below 500 kilowatts.

3. It is very convenient to wiring, the wiring process is relatively simple, and there are a lot of data that can be saved in the later stage, which can reach 50 groups.

4. When working, you can have a dialogue with the man and machine through the prompts of Chinese characters.

5. The high-voltage circuit breaker is equipped with a clock, so it can display the current year, month, day, hour, minute, and second.

Fourth, what are the uses of high-voltage circuit breakers?

First of all, when the line is loaded, the fault of the line can be eliminated; secondly, when the line is at high temperature, it can play a role in control and protection; In addition, according to the needs of the power system, the equipment can be put into operation or withdrawn from operation.

Summary: Now most of the high-voltage circuit breakers can implement automatic and fast closing operation, and after encountering faults, they can eliminate faults in a relatively short time to ensure that the line can be restored to normal operation.