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This paper deals with the discharge properties in low vacuum region of practical vacuum interrupter filled with SF6 gas. In field, the vacuum interrupter inside the cubicle-gas insulated switchgear is surrounded by SF6 gas. If the leakages occur, the surrounding gas may invade the vacuum interrupter and increase the internal pressure. Thus, the pressures are set at 1.3 Pa to 2.6 kPa to simulate the leakage. The measurement of discharge occurring inside the vacuum interrupter was performed with a photomultiplier tube. From the result of the experiment, it is found that the pressure of vacuum interrupter below and above 50 Pa can be distinguished on the basis of the rise time, peak intensity and width of the discharge light pulse. The result reveals that the discharge pulses at pressures below 50 Pa have the relatively larger rise time of 100ns order, and larger pulse width of 2μs order. While, for pressures above 50 Pa, the rise time have relatively smaller value of 10 ns and pulse width of 0.1μs order. The result also shows significant difference in discharge characteristics compared with those in low vacuum of vacuum interrupter filled with air that we have investigated previously.

Discharge Properties in Low Vacuum Region of Vacuum Interrupter Filled with SF6 Gas