Partial Discharge Measurement for Condition Assessment of High Voltage Cables in Power System

2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2019-12-01 DOI:10.1109/APPEEC45492.2019.8994368

K.L. Wu, W.M. Lee CEng, K.L. Ir. So

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引用次数: 3

Abstract

To achieve high supply reliability in power system, ensuring high voltage cables in healthy and operational condition in transmission system is a prerequisite. Assessing the health condition of high voltage cables is a crucial task to prevent system fault. Traditionally, the sound condition of high voltage cables is proven by high voltage testing before commissioning. However, high voltage testing may not reveal all defects on the cable or even developing new defect. Various condition monitoring methodologies have been implemented on power transformer and gas-insulated switchgear for real time condition monitoring. Nevertheless, condition monitoring on cross-linked polyethylene (XLPE) cables is still challenging. We have developed a solution to assess the insulation condition of energised XLPE cable by partial discharge (PD) measurement using high frequency current transformer (HFCT) through link-boxes. The insulation condition can be diagnosed by (phase-resolved PD) PRPD pattern, and source of PD can be traced from the frequency of PD impulse. The effectiveness of PD measurement by HFCT is demonstrated by real cases.

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电力系统高压电缆状态评定中的局部放电测量

要实现电力系统的高供电可靠性，保证输电系统高压电缆处于健康运行状态是前提。对高压电缆的健康状况进行评估是防止系统故障发生的一项重要任务。传统上，高压电缆的良好状态是通过调试前的高压测试来验证的。然而，高压测试可能无法揭示电缆上的所有缺陷，甚至可能产生新的缺陷。为了实现对电力变压器和气体绝缘开关柜的实时状态监测，各种状态监测方法已被应用于电力变压器和气体绝缘开关柜。然而，交联聚乙烯(XLPE)电缆的状态监测仍然具有挑战性。我们开发了一种解决方案，通过链接盒使用高频电流互感器(HFCT)通过局部放电(PD)测量来评估通电XLPE电缆的绝缘状况。利用(相位分辨PD) PRPD图可诊断绝缘状态，并可根据PD脉冲的频率跟踪PD源。通过实例验证了HFCT测量PD的有效性。

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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2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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