What is the overtravel of VS1 vacuum circuit breaker?

In the previous article, we talked about the opening distance of the VS1 vacuum circuit breaker, which is one of the important indicators of mechanical characteristics. In this article, we talked about the over travel of the VS1 vacuum circuit breaker, which is also one of the important indicators of the mechanical characteristics. So what is the over travel of VS1 vacuum breaker? What does it do? What is its range value?

What is the VS1 vacuum circuit breaker: The rated over travel is the distance that the dynamic or static contacts of the vs1 vacuum circuit breaker can move after the contacts of the vs1 vacuum circuit breaker are completely closed. Appropriate over travel can ensure that the contacts can still maintain a certain contact pressure after electrical wear and improve the safety factor of long-term operation;

What does it do? It can effectively reduce closing bounce and reduce contact welding when closing short-circuit current; it can increase a certain rigid separation speed, reduce arcing time, increase dielectric field strength recovery speed, and improve short-circuit current breaking capability. . If the over travel is too small, the closing contact pressure cannot be guaranteed after the contacts are burned out, which affects the ability to carry short-circuit current, the dynamic and thermal stability performance decreases accordingly, and even reclosing spring vibration occurs. If the over travel is too large, it will increase the closing power of the operating mechanism, making the closing extremely unreliable, and even cause air leakage in the vacuum interrupter.

Its value range? The over travel of vs1 vacuum circuit breaker is usually about 15%~40% of the rated opening distance, and the over travel of 12 kV vs1 vacuum circuit breaker is generally 3~4 mm.

To sum up, if we want the vacuum circuit breaker to have a longer life, we need to adjust it according to the specifications when adjusting the vacuum circuit breaker.