Study on the change tendency of electro-magnetic signal under different vacuum degree for 10kV vacuum chamber

Vacuum circuit breakers are widely used in low and medium electrical power system as a result of its simple structure, small volume, high dielectric breakdown strength, good breaking ability and long operating life. However, the vacuum degree will reduce for some complicated reasons during the practical operating process, which leads to a great influence on its breaking capacity and even lose its capacity. In order to address this issue, we develop an electromagnetic antenna technology. This paper presents the findings through the building of experiment test platform and the using of analysis method that the vacuum circuit breaker will launch different electromagnetic signals when the vacuum degree changes, then provides the supporting of experiment and theory to realize on-line vacuum monitoring of vacuum circuit breaker reliably and stably.