Analysis of Aging Insulation Performance of Cable Accessories of 110kV Cable Under Long-Term Operation
[Purposes]Power cables accessories that have exceeded their designed service life still have good electrical and mechanical properties.Currently,there is a lack of effective methods to evaluate the service life of cables accessories based on their status.Therefore,in-depth analysis of the performance of retired cables can comprehensively diagnose problems that exist in the long-term operation of cables.[Methods]This paper analyzes the aging performance of cables accessories under long-term operation,uses cable slices to test the electrical insulation status,surface resistivity and volume resistivity of the cables,and tests their charge trap density through electrostatic potential measurement.[Findings]The results show that the breakdown voltage of retired cables is around 30kV at 63.2%,indicating a high con-sistency of the electrical strength of cable accessories.However,the surface resistivity and volume resis-tivity of the samples are significantly different,and the charge trap density test results show that there are differences in their trap energy levels,which further illustrates their different charge dissipation rates.[Conclusions]By analyzing the electrical characteristics of decommissioned cables,timely troubleshoot-ing and early warning of operating cable faults can be achieved,providing important reference value for cable status diagnosis.
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万方数据
