水树在EPR电缆绝缘

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93) Pub Date : 1993-10-17 DOI:10.1109/CEIDP.1993.378899

J. Xu, A. Garton

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引用次数: 2

摘要

早期对使用年限的交联聚乙烯(XLPE)电缆绝缘中通水树羧酸盐离子的观察，扩展到实验室老化的XLPE的领结树，实验室老化的EPR(乙烯-丙烯橡胶)的领结树和通水树，以及在电解槽中老化的LDPE(低密度聚乙烯)薄膜的表面。EPR中领结树的起始位点经常含有过渡金属氧化物。EPR和实验室老化绝缘体中的水树与薄膜老化XLPE中更广泛研究的例子具有许多共同特征。离子物质(羧酸盐和金属离子)在树木中浓度很高。与未填充的XLPE相比，填充EPR中水树化学状态的共性暗示了一个共同的机制。

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Water trees in EPR cable insulation

An earlier observation of carboxylate ions in vented water trees in service-aged XLPE (cross-linked polyethylene) cable insulation is extended to bow-tie trees in lab-aged XLPE, to bow-tie and vented trees in lab-aged EPR (ethylene-propylene rubber) and to the surface of LDPE (low-density polyethylene) film aged in an electrolytic cell. The initiation sites for bow-tie trees in EPR frequently contain transition metal oxides. Water trees in EPR and lab-aged insulations are shown to share many common features with the more widely studied examples in film-aged XLPE. Ionic materials (carboxylates and metal ions) are present at high concentrations in the trees. The commonality of the chemical state of water trees in filled EPR compared to unfilled XLPE implies a common mechanism.<>

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Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP '93)

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