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Partial discharges (PDs) in the void filled with SF6 gas were investigated under IEC60060-3 standard aperiodic switching impulse (SI) and oscillating switching impulse (OSI). Some single discharges and discharge sequences with different characteristics were detected. A theoretic voltage-time lag (V-t) curve of the first discharges was proposed and proved to be effective in analyzing the occurrences...
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