Tag: vacuum circuit breaker

A breaker which used vacuum as an arc extinction medium is called a vacuum circuit breaker (vcb breaker). In this circuit breaker, the fixed and moving contact is enclosed in a permanently sealed vacuum interrupter. The arc is extinct as the contacts are separated in high vacuum. It is mainly used for medium voltage ranging from 11 kV to 40 kV. In this article, we will introduce the routine maintenance of vcb circuit breaker.

Vacuum circuit breakers are used for switching purposes in high voltage (HV) applications. Vacuum circuit breakers are more efficient, smaller and less expensive. VCB breakers have a much longer lifespan than conventional circuit breakers and require little maintenance. VCB (Vacuum circuit breakers) are ideal for typical utility and industrial applications.

Vacuum circuit breaker is an internal power distribution device in three-phase AC system with voltage of 3-10kV and frequency of 50Hz. In industrial and mining organizations, power plants and substations can be used to protect and control electrical equipment. The vcb circuit breaker can be configured in the middle cabinet, double-layer cabinet and fixed cabinet to manage and protect the high-voltage electrical equipment in the maintenance and frequent operation area.

With new improvements in vacuum breaker design, vacuum circuit breakers are becoming more common at the lower voltage ranges of transmission networks. When choosing a vacuum circuit breaker, we need to consider many factors. But the most important thing is to know about vacuum circuit breakers before you can make a choice. The following brief introduction hopes to help you choose the right one.

Vacuum contactor is a device that can withstand multiple operations (strong mechanical life). It can cut off the load current at the same time, but can not break the short-circuit current. The vacuum contactor has two contacts, normally open and normally closed, and does not have the function of short-circuit current protection. When a given signal is received, it can perform separation and hold actions. Analogus to ordinary home circuit, VCB is like a circuit breaker at home inside a panel and VC is a relay in our any of instruments at home.

The advantages of indoor high voltage vacuum circuit breaker are not only oil-free equipment, but also long electrical life. It has mechanical life, large breaking insulation capacity, strong continuous breaking capacity, small volume, light weight, frequent operation, fire free, less operation and maintenance, etc. And they are quickly recognized by the operation, maintenance and technical personnel of the power department. The quality of some high voltage vacuum circuit breakers is not stable enough, the current carrying voltage is on the high side during operation and some vacuum interrupters still have air leakage. With the wide application of vacuum circuit breaker, faults also occur from time to time. The author analyzes the common faults of vacuum circuit breaker and gives treatment methods.