Measurements of electrical resistances and investigations of factors affecting corrosion and breakages of shielding layers in extruded three-layer 6.6 kV XLPE cables

IF 0.4 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Electrical Engineering in Japan Pub Date : 2023-09-03 DOI:10.1002/eej.23447

Takashi Kurihara, Kenichi Kimura, Takuya Watanabe, Tomoyuki Sato

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引用次数: 0

Abstract

Corrosion and breakages of shielding layers are one of the factors for degradation of extruded three-layer (E-E type) 6.6 kV cross-linked polyethylene (XLPE) cables. Tohoku Electric Power Network has been measuring electrical resistances of shielding layers in E-E type 6.6 kV XLPE cables, and recently has found breakages of shielding layers. The authors performed an accelerated degradation test for shielding layers of E-E type 6.6 kV XLPE cables by taking account of aqueous solution, temperature, heat cycles, bending stress, frequency of an applied voltage, and water-proof layer in the test conditions, and investigated factors affecting corrosion and breakages of shielding layers. Corrosion, cracks, and breakages were found on shielding layers in the cables without water-proof layer, but no crack was found in the cables with water-proof layer, when heat cycles were applied to the cables, and shielding layers were supplied with artificial sea water. We investigated the suppressive effect of the cables with water-proof layer on cracks and breakages of shielding layers by measuring tensile strengths of copper tapes obtained from the shielding layers of the cables with and without water-proof layers.

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挤压三层6.6 kV交联聚乙烯电缆电阻测量及屏蔽层腐蚀破损影响因素研究

屏蔽层的腐蚀和断裂是6.6 kV交联聚乙烯(XLPE)挤压三层(E-E型)电缆劣化的因素之一。东北电网对E-E型6.6 kV交联聚乙烯电缆屏蔽层电阻进行了测量，最近发现屏蔽层有破损现象。针对E-E型6.6 kV交联聚乙烯电缆屏蔽层，在试验条件下考虑了水溶液、温度、热循环、弯曲应力、外加电压频率、防水层等因素，进行了屏蔽层的加速降解试验，研究了影响屏蔽层腐蚀和断裂的因素。不带防水层的电缆屏蔽层出现腐蚀、裂纹、断裂现象，带防水层的电缆加热循环后，屏蔽层用人工海水供给时，屏蔽层未出现裂纹现象。通过测量带和不带防水层电缆屏蔽层铜带的抗拉强度，研究了带防水层电缆对屏蔽层裂缝和断裂的抑制作用。

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来源期刊

Electrical Engineering in Japan 工程技术-工程：电子与电气

CiteScore

0.80

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Electrical Engineering in Japan (EEJ) is an official journal of the Institute of Electrical Engineers of Japan (IEEJ). This authoritative journal is a translation of the Transactions of the Institute of Electrical Engineers of Japan. It publishes 16 issues a year on original research findings in Electrical Engineering with special focus on the science, technology and applications of electric power, such as power generation, transmission and conversion, electric railways (including magnetic levitation devices), motors, switching, power economics.