Insulation Detection and Analysis of XLPE Medium-Voltage Cables

doi:10.11930/j.issn.1004-9649.2014.2.73.4

Abstract

Abstract: The high frequency component characteristics of depolarization current is associated with the length of the tested cables, so large difference between the standard cable length and the aged cable length will affect the judgment of cable’s aging status. The polarization- depolarization current (PDC) method is used to detect the insulation status of medium-voltage cables and the testing data are analyzed. The low frequency component of depolarization current, which is relatively less sensitive to the cable length, is used to overcome the impact of cable length. Cable aging status is determined through analyzing the value range of the depolarization current’s low frequency components, the average discharge rate and the impact of different polarization time. Finally, this method is applied in repaired cables and it is verified that the characteristics of the repaired cable is close to that of new cable with same length, which shows that the method can be used for identification of the cable’s aging status.

Key words: XLPE, medium-voltage cable, insulation detection, polarization and depolarization (PDC) method

CLC Number:

TM855

HUANG Hao, LEI Yong, YAN Jia-jun, LI Chen. Insulation Detection and Analysis of XLPE Medium-Voltage Cables[J]. Electric Power, 2014, 47(2): 73-77.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.2.73.4

https://www.electricpower.com.cn/EN/Y2014/V47/I2/73

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