Electric field regulation of polypropylene insulation for high voltage DC cables

Yu Bao-Qing; Xia Bing; Yang Xiao-Yan; Wan Bao-Quan; Zha Jun-Wei

doi:10.7498/aps.72.20222320

Abstract

High voltage cable is the key factor to determine the quality and capacity of power transmission. Polypropylene has widely attracted more attention because of its excellent heat resistance, insulation and green environmental protection, and it is used as cable material. Polypropylene insulation material for high voltage cable needs to bear pulsed voltage and the DC rated voltage, which can easily cause electric field to be distorted and lead the space charge to be accumulated. Meanwhile, the change of cable temperature will also affect the conductivity of insulating material and promote the accumulation of space charge, resulting in the distortion of internal electric field of insulating material and the initiation and growth of electric tree. Therefore, it is necessary to regulate the electric field of high voltage cable so as to suppress the deterioration phenomena such as electric field distortion, partial discharge and electrical demoralization. In this work, the theory and method of regulating DC electric field of polypropylene insulation of high voltage cable is first introduced. Then the main direction of electric field regulation is presented. Finally, the application prospect of polypropylene cable insulation is also put forward.

Keywords:

Authors and contacts

1.
Beijing Guodianfutong Science & Technology Development Co., Ltd., Beijing 100071, China
2.
Nari Group Corporation/State Grid Electric Power Research Institute, Nanjing 211106, China
3.
School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Corresponding author: Zha Jun-Wei, zhajw@ustb.edu.cn

Funds: Project supported by the Fundamental Research Funds for the Central Universities of China (Grant No. FRF-TP-20-02B2)

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References

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Cited By

图 1 (a) a-PP的分子结构; (b) s-PP的分子结构; (c) i-PP的分子结构

Figure 1. (a) Molecular structure of a-PP; (b) molecular structure of s-PP; (c) molecular structure of i-PP.

DownLoad: Full-Size Img PowerPoint

图 2 flc2hs的函数图^[26]

Figure 2. Function diagram of flc2hs ^[26].

DownLoad: Full-Size Img PowerPoint

图 3 (a) PP和PP-g-MAH的陷阱能级密度, 插图为热激电流谱; (b)介电常数与频率关系; (c)体积电阻率的温度依赖性; (d) PP-g-2%MAH空间电荷分布^[27]

Figure 3. (a) Trap level density of PP and PP-g-MAH; (b) relationship between dielectric constant and frequency; (c) temperature dependence of volume resistivity; (d) PP-g-2%MAH space charge distribution ^[27].

DownLoad: Full-Size Img PowerPoint

图 4 320 kV高压直流电缆的几何形状^[31]

Figure 4. Geometry of 320 kV high voltage direct current cables ^[31].

DownLoad: Full-Size Img PowerPoint

图 5 (a) 320 kV直流电缆典型结构; (b)电导率的函数模型; (c)绝缘层温度分布; (d)施加电压波形; (e)电导率与活化能的关系; (f)电导率与电场依赖系数的关系^[35]

Figure 5. (a) Typical structure of 320 kV DC cable; (b) functional model of conductivity; (c) insulation temperature distribution; (d) applied voltage waveform; (e) relationship between conductivity and activation energy; (f) relationship between conductivity and electric field dependence coefficient^[35].

DownLoad: Full-Size Img PowerPoint

图 6 高压直流电缆系统附件　(a)典型的高压直流预制接头设计, 没有现场分级材料(FGM)层; (b)典型的带FGM层的高压直流预制接头设计; (c)带FGM适配器的HVDC电缆终端的剖面图示意图^[36]

Figure 6. HVDC cable system accessories: (a) Typical HVDC prefabricated joint design without a field grading material (FGM) layer; (b) typical HVDC prefabricated joint design with a FGM layer; (c) schematic cut-away view of a HVDC cable termination with FGM adapters^[36].

DownLoad: Full-Size Img PowerPoint

图 7 (a)不同非线性材料长度的仿真结果; (b)绝缘外表面的电场强度; (c)不同厚度非线性材料的模拟结果; (d)绝缘外表面的电场强度^[42]

Figure 7. (a) Simulation results of different nonlinear material lengths; (b) electric field strength on the outer surface of insulation; (c) simulation results of nonlinear materials with different thickness; (d) electric field strength on the outer surface of insulation^[42].

DownLoad: Full-Size Img PowerPoint

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[8]	赵学风, 倪辉, 李旭, 林涛, 琚泽立, 蒲路, 范明豪, 邓军波, 张冠军 2018 高压电器 54 165 Google Scholar Zhao X F, Ni H, Li X, Lin T, Ju Z L, Pu L, Fan M H, Deng J B, Zhang G J 2018 High Volt. Appar. 54 165 Google Scholar
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[25]	Zha J W, Wang Y, Wang S J, Zheng M S, Bian X M, Dang Z M 2019 Appl. Phys. Lett. 114 252902 Google Scholar
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[30]	Zheng Y S, Huang H F, Zhong X Y, Serdyuk Y V 2021 J. Phys. D Appl. Phys. 54 235501 Google Scholar
[31]	Tian F Q, Zhang S T, Hou C Y 2021 Energies 14 1313 Google Scholar
[32]	Dai X Y, Tian F Q, Li F, Zhang S T, Xing Z L, Wu J B 2021 Energies 14 4722 Google Scholar
[33]	Zhou Y, Yuan C, Li C Y, Meng P F, Hu J, Li Q, He J L 2019 IEEE Trans. Dielectr. Electr. Insul. 26 1596 Google Scholar
[34]	郝艳捧, 陈云, 阳林, 邱伟豪, 傅明利, 侯帅 2017 高电压技术 43 3534 Google Scholar Hao Y P, Chen Y, Yang L, Qiu W H, Fu M L, Hou S 2017 High Volt. Eng. 43 3534 Google Scholar
[35]	李忠华, 刘乐乐, 郑欢, 梁斯婷 2016 中国电机工程学报 36 2563 Google Scholar Li Z H, Liu L L, Zheng H, Liang S T 2016 Proc. CSEE 36 2563 Google Scholar
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[37]	刘刚, 陈志娟 2012 高电压技术 38 678 Liu G, Chen Z Y 2012 High Volt. Eng. 38 678
[38]	Hannan M A, Hussin I, Ker P J, Hoque M M, Hossain L M S, Hussain A, Rahman M S A, Faizal C W M, Blaabjerg F 2018 IEEE Access 6 78352 Google Scholar
[39]	Amaru L, Gaillardon P E, Micheli G D 2014 IET Sci. Meas. Technol. 13 1074
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[41]	尹毅, 吴建东, 胡嘉磊, 张磊, 孙璐, 沈耀军 2018 电气工程学报 13 30 Yin Y, Wu J D, Hu J L, Zhang L, Sun L, Shen Y J 2018 Elec. Manuf. 13 30
[42]	Yang Q H, Hu J, Yuan Z K, Li J Z, Yin Y, Tang H 2021 International Conference on Electrical Materials and Power Equipment Chongqing, China, April 11–15, 2021 p978

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