What Are The Differences Between High-voltage Circuit Breakers And High-voltage Disconnectors?

High-voltage circuit breakers are the main power control equipment in substations. They have arc extinguishing characteristics. When the system is operating normally, they can cut off and connect the no-load and load currents of lines and various electrical equipment; when a system failure occurs, they work with relay protection to quickly cut off the fault current to prevent the scope of the accident from expanding.

The isolating switch does not have an arc extinguishing device. Although the regulations stipulate that it can be operated in situations where the load current is less than 5A, it cannot be operated under load as a whole. However, the isolating switch has a simple structure, its operating status can be seen at a glance from the appearance, and there is an obvious disconnection point during maintenance.

Circuit breakers are referred to as "switches" in use, and disconnectors are referred to as "knife switches" in use. The two are often used together. The differences between high-voltage circuit breakers and disconnectors are as follows:

1. High-voltage load switches can be disconnected with load and have self-arc extinguishing function, but their breaking capacity is very small and limited.

2. High-voltage disconnectors generally cannot be disconnected with load. There is no arc extinguishing cover in the structure. There are also high-voltage disconnectors that can disconnect loads, but the structure is different from that of load switches and is relatively simple.

3. Both high-voltage load switches and high-voltage disconnectors can form obvious disconnection points. Most high-voltage circuit breakers do not have isolation function, and a few high-voltage circuit breakers have isolation function.

4. High-voltage disconnectors do not have protection function. The protection of high-voltage load switches is generally added with fuse protection, which only has quick break and overcurrent.

5. The breaking capacity of high-voltage circuit breakers can be made very high during the manufacturing process. It mainly relies on adding current transformers to cooperate with secondary equipment for protection. It can have short-circuit protection, overload protection, leakage protection and other functions.

The above is the difference between high-voltage circuit breakers and high-voltage isolating switches. If you have any technical questions, please feel free to communicate with us.