Vacuum down of vacuum circuit breaker and leakage of vacuum tube

Whether opening rebound or closing rebound will bring harm to operation: bellows subjected to forced vibration may crack, the interrupter circuit breaker contact leakage; high speed switching, the action at the end of greater impact, causing possible distortion and contact bounce, guide poles, and even cracks; vacuum circuit breaker with capacitor if bounce, also causes damage of capacitor.

It is currently part of harm of vacuum circuit breaker manufacturers have noticed vacuum breaker jumping caused, launched the so-called "no bounce" vacuum circuit breaker, by means of mechanical buffer, greatly reducing the mechanical impact breaker in closing the.

2, the impact of the buffer

Should carefully check the buffer travel, there should be no deformation damage or excessive compression, leaving the buffer margin. Part of the oil filled buffer should regularly check the buffer oil level, timely oil filling.

3, the influence of contact stroke

At present, all kinds of domestic 10kV vacuum circuit breaker arc extinguishing chamber, and its contact exceed 4mm according to the regulations, the distance is about 11mm. Vacuum circuit breaker in the installation or maintenance, should be measured accurately, in strict accordance with the requirements of product installation manual contact stroke adjusting rod, to prevent stroke and beyond, the vacuum circuit breaker in the annual overhaul, should carefully review the circuit breaker trip, travel and contact distance.

In the actual operation, there are many accidents caused by the over adjustment of the circuit breaker and the mechanical impact caused by the mechanical impact during the closing of the circuit breaker.

4, the operation capacity of the impact

The operating mechanism of vacuum circuit breaker is the main common CDlO type, CDl7 type, VSl type, based on the above models, and the transformation of operating mechanism to adapt to different installation space, in recent years, the domestic part of the circuit breaker is equipped with the "permanent magnet operating mechanism".

The operating mechanism of different types of configuration, installation or renovation, all should pay attention to operation of the transmission rod movement distance, if the capacity is too large, will have a serious impact on the interrupter, caused by damage of bellows vacuum interrupter, directly affect the service life of vacuum breaker, the breaker vacuum reducing speed.

5, the influence of closing speed

The switching speed of circuit breaker plays a certain role in the arc extinguishing of vacuum circuit breaker, and also determines the service life of vacuum circuit breaker. Therefore, the circuit breaker should be measured before and after the operation of the switching speed, can be found in time the quality of products and debugging problems. On the one hand, the speed of closing and closing is too large, and when the contact action of the breaker is finished, the mechanical impact is fierce, causing the arc extinguishing chamber to produce more serious vibration.

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