AC breakdown channel of PPLP multi-layer insulation for HTS cable

被引：0

作者：

Nguyen, Dung Van ^{[1
]}

Le, Truong Vinh ^{[1
]}

Kim, Sang Huyn ^{[2
]}

机构：

[1] Department of Electrical Engineering, Cantho University, Cantho city, Viet Nam

[2] Department of Electrical Engineering, Gyeosang National Univesity, Jinju city, Korea, Republic of

来源：

Cryogenics | 2020年 / 108卷

关键词：

Liquefied gases;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The AC breakdown channel of multi-layer insulation was investigated with samples laminated between spherical electrodes under high and low values of applied field stresses. Both samples with butt-gap and without butt-gap immersed in liquid nitrogen (LN2) were used. In addition, the breakdown strength and the voltage-time characteristics of both types of samples were also determined. It was found from the experimental data that the butt-gaps play a decision role in the shape and position of breakdown path as well as the magnitude of the breakdown strength and the lifetime index. However, creepage discharges at the interfaces between layers become more pronounced at a lower value of applied electric field stress. The degradation of insulation layers was found to depend on the value of the applied field stress as well as the sequence of layer in the multi-layer samples. Finally, the breakdown mechanism for multi-layer insulation was suggested. © 2020 Elsevier Ltd

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