To test the insulation can be restored. And failed to restore the insulation after the breakdown [5] to test pressure impulse was given size of 15 times if a breakdown or Park Social discharge no more than two times. the insulation will be tested
, thereby testing the durability of the high voltage capacitor. Pressure impulse lightning waveform standard 1.2 / 50 μs full-wave circuit voltage impulse in the laboratory of high voltage, size 140 kV anode 15 times, each time apart 10 seconds. for example, the waveform of the test Figure 4-1 and 4-2.
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