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绝缘物质在电场的作用下发生剧烈放电或导电的现象叫击穿。
1、正常的情况下耐压试验本身就是一种破坏性试验，不到关键时刻是不做这种实验的；
2、该实验电压是为设备或材料或器材绝缘耐受电压的三倍或运行电压的三倍。前者为设备或材料或器材交接试验电压标准，后者为在用的设备或材料或器材试验电压标准；
3、如果实验前已知设备或材料或器材绝缘已经老化，则在实验时，缓慢升压。一旦出现泄漏电流达到标准值的0.75倍时，所施加的试验电压也达到或超过额定试验电压值的0.75倍时，应暂停实验。
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