文章叙述了绝缘油在氧气、湿度、高温、阳光、强电场和杂质的作用下，性能逐渐变坏。必须定期对绝缘油进行各项试验，主要是电气击穿强度试验以及它的取样方法和试验操作步棸，最后对试验结果进行了分析。
Exposed to oxidation,humidity, high temperature, sunshine and strong electric field, the insulation capability of oil are deteriorated.Therefore, the oil insulator must be regular tested, wherein are consisted in resistance to electric shoch sampling direction and test proceeding.Finally, the test results were analyzed.
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