The new generation of high-voltage vacuum circuit breakers generally use the principle of longitudinal magnetic field arc extinguishing and copper-chromium contact materials, the purpose of which is to reduce contact burnout and improve electrical service life. Improper adjustment of the concentricity of the conductive rod will make the sealing strength of longitudinal gas lines, ceramics, and Kovar-metal not stable enough, resulting in air leakage in the vacuum interrupter.

Most of the bellows of the vacuum interrupter are formed by hydraulic pressure of stainless steel with a thickness of 0.15mm. The pollution level, humidity and salt spray of the application environment of the high-voltage vacuum circuit breaker are not suitable. Harmful gases and condensation will cause pitting corrosion of the bellows, resulting in air leakage of the bellows, cover plate and sealing surface.

Guaranteeing the adjustment of the concentricity of the high-voltage vacuum circuit breaker and selecting the use and storage environment reasonably are important measures to solve the air leakage problem of the vacuum interrupter.