GIL管廊接地系统环流特性及影响因素  

Circulation Characteristics and Influencing Factors of GIL Grounding System

作　　者：汤亮亮 蔡炜 王琼芳[3] 赵淳 徐霞 文习山[4] TANG Liangliang;CAI Wei;WANG Qiongfang;ZHAO Chun;XU Xia;WEN Xishan(NARI Group Limited Corporation(State Grid Electric Power Research Institute Limited Company),Nanjing 211106,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China;Schoool of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)

机构地区：[1]南瑞集团有限公司(国网电力科学研究院有限公司),南京211106 [2]国网电力科学研究院武汉南瑞有限责任公司,武汉430074 [3]中国电力工程顾问集团中南电力设计院有限公司,武汉430071 [4]武汉大学电气与自动化学院,武汉430072

出　　处：《高电压技术》2020年第6期2098-2105,共8页High Voltage Engineering

摘　　要：为了掌握气体绝缘金属封闭输电线路(gasinsulatedtransmission line,GIL)管廊接地系统的环流特性以及环流特性的影响因素,对GIL管廊系统进行了理论性仿真研究。建立500k VGIL接地系统和壳体环流模型,分析了环流系统的自阻抗、相间互感等参数,计算得到GIL三相导线外壳的环流值约为导线电流的75%;对比ATP-EMTP程序的解耦模型和MATLAB程序计算的不解耦模型计算结果,验证了计算结果的可靠性。对GIL管廊沿线外壳电位规律进行分析研究,外壳电位呈现出中间低、端部高的U字形分布,人在管廊内部的接触电压符合规程要求。最后,分析相间短接排对环流特性和外壳电位的影响,发现短接排的增加会使端部的入地电流减小,同时也会使外壳感应电压降低,理论研究建议每隔80 m在铝合金外壳上加装短接排。In order to grasp the circular current characteristics of gas insulated transmission line(GIL)pipe corridor grounding system and the influencing factors of circulation characteristics,theoretical simulation research was carried out for GIL pipe corridor grounding system.The 500 kV GIL grounding system and the shell circular current model were established,and the parameters of self-impedance and phase-phase mutual inductance were analyzed.The results show that the shell circular current value of GIL is about 75%of conductor current.The reliability of calculation results was verified by comparing the decoupling model calculation of ATP-EMTP program with the decoupling model calculation of MATLAB program.And then,the shell potential distribution rule along the GIL corridor was studied.The calculation results show that the shell potential present a U-type distribution,the maximum touch potential difference inside the GIL pipe corridor meet the requirements of the regulations.At last,short circuit connection bar was studied,which shows that the bars can reduce the ground current at the end of the shell significantly.As the number of short circuit connection bar increases,the grounding current at the end of the shell and the shell potential will decrease gradually.The short circuit connection bar can be installed on the aluminum alloy shell at every 80 m.

关 键 词：GIL 环流 接地系统 壳体电位 相间短接排 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM75