preventive test of insulation
preventive test of insulation
绝缘预防性试验
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The judgment of transformer insulation condition, which is based on preventive test and DGA, has played an important role of accident prevention for a long time.
长期以来，根据预防性试验和油中溶解气体的气相色谱分析结果判断变压器的绝缘状况，对防止事故的发生起到了很大作用。
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