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Characterizing HV XLPE cables by electrical, chemical and microstructural measurements on cable peeling: effects of surface roughness, thermal treatment and peeling location

机译：通过电气，化学和微观结构测量来表征HV XLPE电缆对电缆的剥落：表面粗糙度，热处理和剥落位置的影响

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摘要

Characterization of the electrical, chemical, and microstructural properties of high voltage cables was the first step of the European project “ARTEMIS”, which has the aim of investigating degradation processes and constructing aging models for the diagnosis of cross-linked polyethylene (XLPE) cables. Cables produced by two different manufacturers were subjected to a large number of electrical, microstructural, and chemical characterizations, using cable peelings, instead of lengths of whole cables, as specimens for the measurements. Here the effect of surface deformation and roughness due to peeling and the relevance and significance of thermal pre-treatment prior to electrical and other measurements is discussed. Special emphasis is put on space charge, conduction current and luminescence measurements. We also consider the dependence of these properties on the spatial position of the specimen within the cable. It is shown that even though the two faces of the cable peel specimens have different roughness, the low-field electrical properties seem quite insensitive to surface roughness, while significant differences are detectable at high fields. Thermal pre-treatment is required to stabilize the insulating material to enable us to obtain reproducible results and reliable inter-comparisons throughout the whole project. The spatial position of the specimens along the cable radius can also have a non-negligible influence on the measured properties, due to differential microstructure and chemical composition.
机译：高压电缆的电，化学和微结构特性的表征是欧洲项目“ ARTEMIS”的第一步，该项目旨在研究降解过程并构建老化模型以诊断交联聚乙烯（XLPE）电缆。由两个不同制造商生产的电缆经过大量的电气，微观结构和化学表征，使用电缆剥皮代替整个电缆的长度作为测量样本。此处讨论了由于剥离引起的表面变形和粗糙度的影响，以及在进行电气和其他测量之前进行热处理的相关性和重要性。特别强调空间电荷，传导电流和发光测量。我们还考虑了这些属性对电缆内样本空间位置的依赖性。结果表明，即使电缆剥皮试样的两个表面具有不同的粗糙度，低场电性能似乎对表面粗糙度也不敏感，而在高场下则可以检测到显着差异。需要进行热预处理来稳定绝缘材料，以使我们能够在整个项目中获得可重复的结果和可靠的内部比较。由于微结构和化学成分的差异，沿电缆半径的样本空间位置对测量的性能也有不可忽略的影响。

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