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| Effect of Degassing Treatments on Insulation Characteristics of High Voltage DC Cables |
| Luo Bing1, Meng Fanbo2, Wang Tingting1, Jia Lei1, Chen Xiangrong2 |
1. State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou 510663 China;
2. Zhejiang Provincial Key Laboratory of Electrical Machine Systems College of Electrical Engineering Zhejiang University Hangzhou 310027 China |
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Abstract In order to study the effect of different degassing time on the insulation properties of high-voltage DC cables, in this paper, ultra-pure cross-linked polyethylene (XLPE) cable material is used to prepare samples by flat-plate hot pressing. Four samples with different degassing time of 0h, 12h, 36h and 90h were obtained by degassing treatment at 70℃ and normal pressure. Through the current density, space charge, DC breakdown, and XRD test, the change rule of the insulation characteristics of the XLPE sample before and after degassing was studied. The results show that the space charge distribution is significantly improved after 12h of degassing, and there is almost no space charge accumulation near the electrode; The experiment after 36h of degassing has the best electrical performance, the current density is significantly reduced, and the breakdown field strength is increased by about 18kV/mm; After degassing for 90h, the crystallinity characteristic of the sample changed significantly, the crystallinity is decreased by about 11%, and the crystal diffraction peak intensity is decreased by about 62%. The above results indicate that the degassing treatment contributes to the volatilization of cross-linking by-products in the XLPE sample and the improvement of its insulating properties, and the insulation performance of the material can be improved by optimizing the degassing time, thereby reducing the production and time costs of the enterprises.
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Received: 11 July 2020
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2021, Vol. 36 
