Abstract
The post-arc dielectric recovery process is an important stage of current interruption in a vacuum circuit breaker. The post-arc current is an important macroscopic electric characteristic of the post-arc dielectric recovery process, which has caused a lot of concerns in the past few decades. The post-arc currents of vacuum circuit breakers with different types of contacts, such as butt contacts, and axial magnetic field (AMF) contacts and transverse magnetic field (TMF) contacts with different materials, are measured with a high-resolution current-zero diagnostic system. Besides, the vacuum arcs are also recorded by a high-speed camera. The experimental results present that the contact structures and materials show an obvious effect on the post-arc current especially when they interrupt a high current. Besides, the relationship between the vacuum arc and the post-arc current is analyzed.
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