Voltage behavior of vacuum circuit breaker in case of series connected

The vacuum circuit breaker is used as the single-break, and investigation is not conducted so much about the multi-break vacuum circuit breaker at present. So, we are investigating multi-break interrupters performance and the relation between the post arc current and the voltage distribution ratio in the double-break vacuum circuit breaker. In first investigation, performances of single, double and triple-break vacuum interrupter are measured to reveal their characteristics. In the results, multi-break vacuum interrupter has better breakdown characteristics than single-break vacuum interrupter. In second investigation, the post arc current and the voltage distribution ratio were measured in order to clarify the relation between the post arc current and voltage distribution ratio. Experiments are measurement of the post arc current which flows into one vacuum interrupter, and measurement of the voltage distribution ratio and post arc current of a double-break vacuum circuit breaker. The results of investigation showed that the bias of voltage distribution ratio occurs when the post arc current value which flows into each vacuum interrupter in a double-break vacuum circuit breaker became imbalanced. In addition, it turned out that the post arc current of spiral electrode is very scattering as compared with axial magnetic field electrode. It turned out that it is better to use the axial magnetic field electrode for a double-break vacuum circuit breaker.