Vacuum interrupter is the key component of vacuum circuit breaker, it is made of glass or ceramic as support and sealing, internal moving, static contacts and shielding cover, indoor negative pressure, vacuum degree of 133×109133×lOJPa, to ensure its arc extinguishing performance and insulation level when breaking. When the vacuum degree is reduced, its breaking performance is significantly reduced, so the vacuum interrupter shall not be affected by any external force collision, it is strictly forbidden to knock, hand pat, and no force when moving and maintaining o It is forbidden to put anything on the vacuum circuit breaker to prevent damage to the vacuum interrupter when falling. Before leaving the factory, the vacuum circuit breaker has undergone strict parallelism inspection and assembly, and the bolts of the arc extinguishing chamber should be tightened during maintenance to ensure that its force is uniform. DC high voltage generator

Vacuum circuit breaker in the vacuum arc extinguishing chamber to break the current and arc extinguishing, and the vacuum circuit breaker itself does not have a qualitative, quantitative monitoring of vacuum degree characteristics of the device, so the vacuum degree reduction fault is a hidden fault, at the same time, vacuum degree reduction will seriously affect the vacuum circuit breaker breaking overcurrent ability, and lead to a sharp drop in the service life of the circuit breaker will cause switch explosion when serious.

In summary, the main problem of vacuum interrupters is that the vacuum degree is reduced. The main reasons for the reduction in vacuum level are as follows.

(1) Vacuum circuit breaker is a relatively delicate component, after the tube factory leaves the factory, after many transportation bumps, installation vibration, accidental collision, etc., there may be leakage of glass or ceramic sealing.

(2) There are problems in the material or production process of the vacuum interrupter, and leakage points occur after multiple operations.

(3) Split vacuum circuit breaker, such as the use of electromagnetic operating mechanism, during operation, due to the relatively large distance of the operation linkage, directly affect the characteristics of the switch at the same time, bounce, overstroke and other characteristics to accelerate the reduction of vacuum. DC high voltage generator

Treatment method of vacuum reduction of vacuum interrupter chamber:

Frequently observe the vacuum interrupter and regularly use the vacuum switch vacuum tester to measure the vacuum degree of the vacuum extinguishing chamber to ensure that the vacuum degree of the vacuum extinguishing chamber is within the specified range; When the vacuum degree decreases, the vacuum interrupter must be replaced, and the characteristic tests such as stroke, contemporaneity, and bounce must be done.