| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系 === 104 === High voltage XLPE power cable is often used for power transmission and distribu-tion system in Taiwan. DC voltage insulation testing is commonly applied as withstand test or leakage current measurement technique to analyze the insulation of power cables. DC voltage insulation testing devices are portable and cost-effective, but it is a destruc-tive test. It is recommended to assess the insulation of high voltage XLPE power cable by simple withstand and tangent delta test with very low frequency (VLF: 0.01~0.1 Hz) sine wave voltage sources to overcome the weak point of the DC voltage insulation test-ing, and assess the insulation precisely. So far, the assessment criteria reported in the journal literature and IEEE standard are established by the cable system database in the North American region. In this research, we introduced a convenient cable insulation diagnostic system with VLF instrument in our field testing. Until now we have accumu-lated a lot of experience in the diagnostic system, and we established a new suitable as-sessment criterion by a cable system database in Taiwan. Thus, we can deduce possible causes of a defect in cable insulation from the condition assessment. In this way, the cost of resetting defective power cable systems can be reduced and the safety and quali-ty of electrical equipment can be improved.
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