Introduction to common sense of vacuum circuit breakers(1)

The vacuum circuit breaker is named because the arc extinguishing medium and the insulating medium of the contact gap after arc extinguishing are high vacuum.It has the advantages of small size, light weight, suitable for frequent operation, and no maintenance required for arc extinguishing，It is widely used in the distribution network。

The vacuum circuit breaker mainly includes three parts: vacuum interrupter, electromagnetic or spring operating mechanism, bracket and other components.

The life of vacuum circuit breakers includes three categories: vacuum life, mechanical life and electrical life。

Vacuum circuit breaker

1.Vacuum life:It is used to measure the date the vacuum interrupter leaves the factory,After transportation and storage.,During installation and operation, whether the internal vacuum degree is within the allowable working vacuum degree,Whether the vacuum life is over.It is mainly tested whether the vacuum pressure in the arc extinguishing chamber is above the maximum allowable working value.

2.Mechanical life:Refers to the number of mechanical actions of the circuit breaker since the day it leaves the factory. It is counted as one after the opening and closing operation is completed, and it can generally reach more than 10,000 times.The mechanical life mainly depends on the life of the stainless steel bellows,The end of the mechanical life is the rupture of the bellows.

3.Electrical life:Refers to the breaking times of the rated short-circuit current or the breaking times of the rated working current.Is the electrical life over?It can be determined by the allowable wear thickness of the contact,When the contact wear reaches the specified value, it means that the electrical life of the arc extinguishing chamber is over.

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