The HVDC withstand voltage test can discover the defect of paper insulated cable efficiently, but it has limitation in discovering the defect of cross-linked polyethylene insulated power cable.

分析了高电压直流耐压试验可有效发现纸绝缘电缆缺陷，但在发现交联聚乙烯绝缘电力电缆缺陷方面有局限性。

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The DC test, which is an effective means for the diagnostics of oil impregnated paper insulated cable, is still used even now, but it is ineffective and harmful for the plastic insulated cable.

直流电压试验作为一种对油浸纸绝缘电缆非常有效的方法应用至今，但它对塑料绝缘电缆是无效而且有害的。

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Detection of furfurol content in transformer oil is an effective method to judge the aging degree of insulated paper in the transformer.

检测变压器油中糠醛含量是判断变压器绝缘纸老化程度的有效方法。

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Since a green paper was published in 2008, more than 1, 300 homes have been insulated through the Energy Efficiency Service.

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