Correlation between Partial Discharge Inception Voltage and Breakdown Voltage Characteristics of Butt-gap in HVDC Mass Impregnated PPLP Cable

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2018-10-01 DOI:10.1109/CEIDP.2018.8544729

D. Oh, Ho-young Lee, Sun-Jin Kim, Bang-wook Lee

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引用次数: 3

Abstract

The voids are formed inside the butt-gap in the HVDC Mass Impregnated PPLP (MI PPLP) cable since the thermal contraction of the mass is about ten times larger than PPLP. When the DC voltage applied to the MI PPLP cable is above partial discharge inception voltage (PDIV), partial discharge occurs in the void. The continued partial discharge accelerates electrical ageing and breakdown may occur as a result. Hence, it is necessary to study the correlation between partial discharge inception and breakdown in DC steady state. Partial discharge and breakdown in the DC steady state are affected by the temperature and the polarity of the applied voltage. Therefore, in this paper, to analyze the correlation between PDIV and Breakdown Voltage (BDV) of butt-gap in HVDC MI PPLP cable, BDV and PDIV measurement were performed according to temperatures of the specimen and polarities of the applied voltage. From the experimental results, The BDV of the butt-gap in the MI PPLP was found to be inversely proportional to the conductivity and proportional to PDIV. Also, PDIV and BDV were higher at negative voltage compared to positive polarity voltage. Consequently, BDV can be predicted through the temperature of the MI-PPLP and PDIV.

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高压直流质量浸渍PPLP电缆对接间隙局部放电起始电压与击穿电压特性的关系

在高压直流质量浸渍PPLP (MI PPLP)电缆中，由于质量的热收缩约为PPLP的十倍，因此在对接间隙内形成空隙。当施加在MI PPLP电缆上的直流电压高于局部放电起始电压PDIV (partial discharge inception voltage)时，在空隙中发生局部放电。持续的局部放电加速了电气老化，可能导致击穿。因此，有必要研究直流稳态下局部放电起始与击穿的关系。直流稳态下的局部放电和击穿受温度和外加电压极性的影响。因此，本文为分析HVDC MI PPLP电缆对接间隙PDIV与击穿电压(BDV)的相关性，根据试样温度和外加电压极性进行BDV和PDIV测量。从实验结果来看，MI - PPLP中对接间隙的BDV与电导率成反比，与PDIV成正比。PDIV和BDV在负极性电压下均高于正极性电压。因此，可以通过MI-PPLP和PDIV的温度来预测BDV。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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