Partial Discharge in Mass-Impregnated, Lapped PPLP Cables

2018 IEEE Electrical Insulation Conference (EIC) Pub Date : 2018-06-01 DOI:10.1109/EIC.2018.8481074

M. Praeger, Zhiqiang Xu, P. Lewin, George Chen

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引用次数: 1

Abstract

The work presented here tackles three key objectives: Firstly, a method of producing realistic models of lapped HVDC cables is devised and implemented. Secondly, the properties of poly propylene laminated paper (PPLP) as used in mass impregnated (MI), HVDC cables are investigated. Finally, partial discharge (PD) measurements are made under DC conditions in order to assess the suitability of this method for online condition monitoring of HVDC assets. In-house fabrication of model HVDC cables makes it possible to deliberately insert defects into the samples during manufacture. The PD behavior of mass impregnated samples is thereby compared with dry lapped ones and it is shown that dry samples (or dry regions within a cable) exhibit higher rates of PD but with decreased average PD charge. In addition, DC PD is measured for specimens that are subjected to bending. In this study no clear change in DC PD is observed due to bending (even up to the point of failure due to breakdown). Dissection of a sample that has broken down reveals the extensive damage caused by the bending. It is concluded that DC PD tests are relatively insensitive to cable bending defects and that fluid impregnant may further mask these. DC PD is, however, quite sensitive to incomplete impregnation and may be well suited to continuous monitoring where large data sets are available.

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大量浸渍、搭接的PPLP电缆的局部放电

本文提出了三个关键目标:首先，设计并实现了一种生成搭接高压直流电缆真实模型的方法。其次，研究了聚丙烯复合纸(PPLP)在大浸渍(MI)高压直流电缆中的性能。最后，对直流条件下的局部放电(PD)进行了测量，以评估该方法在高压直流资产在线状态监测中的适用性。内部制造模型HVDC电缆可以在制造过程中故意将缺陷插入样品中。因此，将质量浸渍样品的PD行为与干研磨样品进行比较，结果表明，干样品(或电缆内的干区域)表现出更高的PD率，但平均PD电荷降低。此外，直流PD测量试样受到弯曲。在这项研究中，没有观察到DC PD因弯曲而发生明显变化(即使达到击穿导致的失效点)。对破碎的样品进行解剖，发现弯曲造成了大面积的破坏。得出的结论是，直流PD测试对电缆弯曲缺陷相对不敏感，流体浸渍可能会进一步掩盖这些缺陷。然而，直流PD对不完全浸渍非常敏感，可能非常适合于有大量数据集的连续监测。

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 Electrical Insulation Conference (EIC)

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