Cross-linking polyethylene (XLPE) power cables are widely used as an excellent insulation material for high-voltage direct current (HVDC) transmission. For the design and operation of HVDC-based power cables, the conduction properties of XLPE insulation must be obtained. This study aimed to establish a highly reliable conductivity-measurement system that can diagnose the XLPE insulation of cables before and after aging by evaluating the repeatability of their conductivity. In this study, a conductivity-measurement circuit was constructed using the polarization-and-depolarization-current technique. Conductivity was measured according to the conductor temperature by using an applied electric field, and then the repeatability of the measured conductivity was evaluated using a statistical method. The experimental results show that the minimum repeatability was 6%, thereby demonstrating the establishment of a reliable conductivity-measurement system.

中文翻译：

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HVDC XLPE 模型电缆直流电导率测量的重复性评估

交联聚乙烯（XLPE）电力电缆被广泛用作高压直流（HVDC）传输的优良绝缘材料。对于基于高压直流的电力电缆的设计和运行，必须获得交联聚乙烯绝缘的导电性能。本研究旨在建立一个高度可靠的电导率测量系统，通过评估其电导率的可重复性来诊断电缆老化前后的 XLPE 绝缘。在这项研究中，使用极化和去极化电流技术构建了电导率测量电路。通过使用外加电场根据导体温度测量电导率，然后使用统计方法评估测量的电导率的可重复性。