The HVDC withstand voltage test can discover the defect of paperinsulated 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。
2
The DC test, which is an effective means for the diagnostics of oil impregnated paperinsulated 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。
3
Detection of furfurol content in transformer oil is an effective method to judge the aging degree of insulatedpaper in the transformer.