Effect of Degassing Treatments on Insulation Characteristics of High Voltage DC Cables

被引：0
|
作者：
Luo B. [1 ]
Meng F. [2 ]
Wang T. [1 ]
Jia L. [1 ]
Chen X. [2 ]
机构：
[1] State Key Laboratory of HVDC, Electric Power Research Institute, China Southern Power Grid, Guangzhou
[2] Zhejiang Provincial Key Laboratory of Electrical Machine Systems, College of Electrical Engineering, Zhejiang University, Hangzhou
来源：
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2021年 / 36卷
关键词：
Breakdown strength; Cross-linked polyethylene; Current density; Degassing process; High voltage direct current cable; Space charge;
D O I：
10.19595/j.cnki.1000-6753.tces.L90490
中图分类号：
学科分类号：
摘要：
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. © 2021, Electrical Technology Press Co. Ltd. All right reserved.
引用
收藏
页码：730 / 735
页数：5
相关论文
共 14 条
  • [1] Li Guochang, Wang Jiaxing, Wei Yanhui, Et al., Effect of material properties of XLPE/SIR and interface charge accumulation on electric field distribution of HVDC cable accessory, Transactions of China Electrotechnical Society, 36, 14, pp. 3081-3089, (2021)
  • [2] Li Rong, Zhou Kai, Wan Hang, Et al., Identification and location of local defects in power cable body based on input impedance spectroscopy, Transactions of China Electrotechnical Society, 36, 8, pp. 1743-1751, (2021)
  • [3] Zhu Yufeng, Xu Yongpeng, Chen Xiaoxin, Et al., Pattern recognition of partial discharges in DC XLPE cables based on convolutional neural network, Transactions of China Electrotechnical Society, 35, 3, pp. 659-668, (2020)
  • [4] Yin You, Zhou Kai, Li Shiyu, Et al., Interface polarization characteristics of water tree aged XLPE cables based on polarization and depolarization current method, Transactions of China Electrotechnical Society, 35, 12, pp. 2643-2651, (2020)
  • [5] Pan Wenlin, Ren Haiyang, Mei Wenjie, Et al., Study on degassing time of 525kV flexible DC submarine cable with extruded insulation, Insulating Materials, 51, 12, pp. 47-52, (2018)
  • [6] Tantipattarakul S, Vaughan A S, Andritsch T., On the influence of morphology and chemical defects on charge transport dynamics in polyethylene: thermal ageing and concentration gradient, Journal of Physics D: Applied Physics, 52, 39, (2019)
  • [7] Bergelin P, Jeroense M, Quist T, Et al., 640kV extruded HVDC cable system
  • [8] Zhang Zhenpeng, Hu Liexiang, Zhao Jiankang, Et al., Formation process and electrical tree characteristics of insulation recovery transition zone of factory joints in 500kV submarine cable, High Voltage Engineering, 45, 11, pp. 3413-3420, (2019)
  • [9] Chen Xiangrong, Dai Chao, Yu Linwei, Et al., Effect of thermal ageing on charge dynamics and material properties of 320kV HVDC XLPE, IEEE Transactions on Dielectrics and Electrical Insulation, 26, 6, pp. 1797-1804, (2019)
  • [10] Liu Zhiquian, Hao Jian, Liao Ruijin, Et al., Morphological, structural, and dielectric properties of thermally aged AC 500kV XLPE submarine cable insulation material and its deterioration condition assessment, IEEE Access, 7, pp. 5065-5075, (2019)
12