At the request of air-operation-less subsations, air-operated circuit breakers are going to be replaced to oli-operated or spring-operated circuit breakers recently. To apply a spring-actuater of lower operating energy, it is necessary to reduce the operating energy of interrupters.
The authors investigated a hybrid circuit breaker of series connection of thermal puffer gas interrupter and vacuum interrupter. The withstand-voltage ability of thermal puffer gas interruter, which requires small operating energy, is high, but high-
di/
dt or high-
dV/
dt interrupting ability is not so high. On the other hand, high-
di/
dt or high-
dV/
dt interrupting ability of vacuum circuit breaker is high, but its unit voltage is difficult to increase. So the authors invented to connect them is series. Its operating energy will be quite lower than that of conventional puffer type gas circuit breaker.
One of the subjects for developping the hybrid circuit breaker is to reduce the distribution of transient recovery voltage of vacuum interrupter during high current interruption. Interrupting characteristics were examined experimentally. As a result, interrupting ability of thermal puffer gas interrupter was improved by changing gas flow from single-flow to double-flow. The principle of voltage sharing of the hybrid circuit breaker were confirmed. This means that the hybrid circuit breaker of series connection of thermal puffer gas interrupter and vacuum interrupter will be realized as a quite low operating enegy pufferless circuit breaker.
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