What are the components inside the high-voltage distribution cabinet?

As a key electrical equipment for receiving and distributing high-voltage electric energy in the power system, the high-voltage distribution cabinet plays an indispensable role in the safe and stable operation of the power system. There are many types of components in the cabinet, and each has a unique function. So, what are the components inside the high-voltage distribution cabinet? The following is an introduction to some of the main components of the high-voltage distribution cabinet.

Busbar

Busbar is a conductor responsible for collecting and distributing electric energy in a high-voltage distribution cabinet. Like blood vessels in the human body, it closely connects various electrical components in the distribution cabinet to achieve efficient transmission and distribution of electric energy. According to different materials, busbars are mainly divided into copper busbars and aluminum busbars. Copper busbars have excellent performance in power transmission due to their excellent conductivity and low resistivity, but their price is relatively high. Aluminum busbars have emerged with the advantages of light weight and low cost, but their conductivity is slightly inferior to copper busbars.

Circuit breaker

Circuit breaker is one of the core components of high-voltage power distribution cabinets. Its main function is to quickly cut off the circuit in an instant when the circuit encounters faults such as short circuit and overload. Like a loyal guard, it protects power equipment and lines from damage. It has a strong ability to carry and break current under abnormal circuit conditions within a specified time, and is the key to ensuring the safety of the power system. Common types of circuit breakers include vacuum circuit breakers and sulfur hexafluoride circuit breakers. Vacuum circuit breakers are popular for their strong arc extinguishing ability, long service life, and small size; sulfur hexafluoride circuit breakers play an important role in high-voltage and large-capacity power systems due to their large breaking capacity and good insulation performance.

Lightning arrester

In the power system, the lightning arrester is specially used to protect electrical equipment from lightning overvoltage. When the power system is unfortunately struck by lightning, the lightning arrester can quickly limit the lightning overvoltage to a safe range and guide the lightning current smoothly into the ground, which effectively protects other components and power equipment in the distribution cabinet. Common lightning arresters include valve type lightning arresters and zinc oxide lightning arresters. Among them, zinc oxide lightning arresters have been widely used in high-voltage distribution systems due to their significant advantages such as fast action, large current capacity, and low residual pressure.

Isolating switch

Isolating switches are mainly used to isolate power supply, completely disconnect high-voltage maintenance equipment from live equipment, form a clearly visible disconnection point, and provide solid protection for the personal safety of maintenance personnel. It should be noted that the isolating switch does not have an arc extinguishing device, so it cannot be used to cut off load current and short-circuit current. Its operation mode is usually divided into manual and electric, with a simple structure and low cost. In the actual operation of high-voltage distribution cabinets, isolating switches often work in conjunction with circuit breakers. The circuit breaker first cuts off the load current, and then the isolating switch isolates the power supply.

Isolating switch

Isolating switches are mainly used to isolate power supply, completely disconnect high-voltage maintenance equipment from live equipment, form a clearly visible disconnection point, and provide solid protection for the personal safety of maintenance personnel. It should be noted that the isolating switch does not have an arc extinguishing device, so it cannot be used to cut off load current and short-circuit current. Its operation mode is usually divided into manual and electric, with a simple structure and low cost. In the actual operation of high-voltage distribution cabinets, isolating switches often work in conjunction with circuit breakers. The circuit breaker first cuts off the load current, and then the isolating switch isolates the power supply.

Isolating switch

Isolating switches are mainly used to isolate power supply, completely disconnect high-voltage maintenance equipment from live equipment, form a clearly visible disconnection point, and provide solid protection for the personal safety of maintenance personnel. It should be noted that the isolating switch does not have an arc extinguishing device, so it cannot be used to cut off load current and short-circuit current. Its operation mode is usually divided into manual and electric, with a simple structure and low cost. In the actual operation of high-voltage distribution cabinets, isolating switches often work in conjunction with circuit breakers. The circuit breaker first cuts off the load current, and then the isolating switch isolates the power supply.

Operating mechanism

The operating mechanism is mainly used to operate circuit breakers, disconnectors and other components to achieve the closing and opening of the circuit. It can be operated manually or remotely controlled by electric, pneumatic and other means, which greatly improves the convenience and flexibility of operation. The operating mechanism is usually composed of an operating handle, a transmission mechanism, an energy storage mechanism and other parts. Among them, the energy storage mechanism can reserve enough energy for the operating mechanism before closing the circuit to ensure that the closing operation can be carried out smoothly.

The above-mentioned components cooperate with each other and work closely together to realize the all-round monitoring and protection of the distribution system, laying a solid foundation for the stable operation of the power system.