アークモデルを用いたCO₂遮断器のSLF遮断性能評価

抄録

This paper shows the simulation of SLF interrupting performances for CO₂ gas circuit breakers. In the SLF interruption tests using 72kV-CO₂ gas model circuit breakers, very large post arc currents were measured. This point is obviously difference between CO₂ circuit breaker and SF₆ one.
To simulate the SLF interrupting performances for the SF₆ gas circuit breakers, serially connected 3 arc models were developed. In the arc model, Cassie arc model and two Mayr arc models were serially connected. It was tried to use the arc model to simulate the SLF interrupting performances for CO₂ circuit breaker.
As a result, it was good agreement with the measurements and simulations. The large post arc currents could be simulated by the arc model. It was shown that the SLF interrupting performance of the CO₂ circuit breaker was dependent on the Mayr model simulated around voltage extinction peak. On the other hand, the performance of the SF₆ gas circuit breaker was dependent on the Mayr model simulated around current zero. From the result, it proved that most severe SLF condition for the CO₂ gas circuit breaker was L75 or L80.