Definition of high and low voltage power distribution equipment

Definition of high and low voltage power distribution equipment

Power distribution equipment refers to all kinds of complete equipment for power, power distribution and lighting in low-voltage power distribution systems of power plants, substations and factories and mines.

△ Common low-voltage power distribution equipment include: low-voltage power distribution panel, switch cabinet, switch board, lighting box, power box and motor control center.

△ Common high-voltage power distribution equipment include: high-voltage fuses, high-voltage disconnectors, high-voltage load switches, high-voltage circuit breakers, etc.

Isolation switch: It belongs to a special knife gate. There is no special arc extinguishing device. It cannot be used to connect and cut off the load current and short-circuit current. It can only be operated when the electrical circuit is cut off. Its main function is to isolate the power supply, so that there is an obvious disconnection point between the power supply and the power failure electrical equipment.

High-voltage circuit breaker: Not only can cut off or close the no-load current and load current in the high-voltage circuit, but also cut off the overload current and short-circuit current through the role of the relay protection device when the system fails, it has a fairly perfect arc extinguishing structure and Sufficient interruption capacity.

High-voltage load switch: A high-voltage load switch is an electrical appliance whose function is between a high-voltage circuit breaker and a high-voltage disconnector. It has a simple arc extinguishing device, so it can switch on and off a certain load current and overload current. However, it cannot cut off the short-circuit current, so it is generally used in series with a high-voltage fuse and uses the fuse to perform short-circuit protection.