基于体表电场的110 kV电缆终端绝缘子带电作业方式选择研究  

Live Working Mode Selection of 110 kV Cable Terminal Insulator Based on Body Surface Electric Field

作　　者：何光华[1] 王兴宇 徐骏 吴田 黎鹏 HE Guanghua;WANG Xingyu;XU Jun;WU Tian;LI Peng(State Grid Wuxi Power Supply Company,Wuxi 214000,China;School of Electrical and New Energy,Three Gorges University,Yichang 443002,China)

机构地区：[1]国网无锡供电公司,江苏无锡214000 [2]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电瓷避雷器》2022年第5期186-191,198,共7页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:51567014);甘肃省科技计划项目(编号:17CX2JA022)。

摘　　要：110 kV高压电缆终端的结构紧凑且电场分布复杂,而带电作业人员的体表电场分布是制定安全防护和作业方式的重要依据。针对典型的110 kV电缆户外终端,建立带电作业人员在地电位、中间电位和等电位3种作业方式下的电场仿真模型。分析结果表明:A相地电位作业时,作业人员体表电场随着靠近电缆终端而增大,在肩部与电缆终端平台平行时增加到77.91 kV/m;A相等电位作业,水平方向远离电缆终端电场减小,超过0.3 m时,体表电场会出现一个最大值;B相中间电位作业,人体头、手、脚3个部位畸变场强较大,竖直方向移动时,每向上移动0.1 m,电场约上升2.2 kV/m。在110 kV电缆终端附近作业时,等电位作业时体表电场最大且短接空气间隙最多,宜采用地电位或中间电位作业。The structure of 110 kV high-voltage cable terminal is compact and the distribution of electric field is complex. The magnitude and distribution characteristics of electric field on body surface of live line workers are an important basis for formulating the safety protection and operation methods. In aim to attain the distribution of electric field on body surface of live-line workers under different working conditions, combined with typical 110 kV cable outdoor terminal, the analysis model of the surface electric field of human body under different station positions was established with three working conditions, namely earth potential, middle potential and equal potential. Analysis results show that: When live working at ground potential of A phase, the higher the vertical direction, the higher the electric field of the human body will be. The maximum value is 77.91 kV/m when the shoulder is parallel to the independent platform of the cable terminal. When live working at equal potential of A phase, the farther the distance of workers and the cable terminal in the horizontal direction, the smaller the electric field will be, when the distance exceeds 0.3 m, there will be a maximum surface electric field. When live working at intermediate potential of B phase, The distortion field intensity of head, hands and feet is relatively large. When workers accesse to equal potential in vertical direction, electric field rises about 2.2 kV/m for each upward movement of 0.1 m. When operating near the 110 kV cable terminal, the surface electric field is the largest and the short air gap is the largest during the equal potential operation, so the ground potential or intermediate potential working can be given priority.

关 键 词：电缆终端 体表电场 电场分布 带电消缺 

分 类 号：TM75[电气工程—电力系统及自动化] TM84