架空线—GIL混合系统短路电流分布特性研究  

Study on Short Circuit-current Distribution Characteristics of Overhead Transmission Line-GIL Hybrid Transmission System

作　　者：汤亮亮[1,2] 吕金煌 谭进 赵淳[1,2] 徐霞[1,2] 刘刚[1,2] TANG Liangliang;LYU Jinhuang;TAN Jin;ZHAO Chun;XU Xia;LIU Gang(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China;Quanzhou Yixing Electric Power Engineering Construction Co.,Ltd.,Fujian Quanzhou 362000,China)

机构地区：[1]南瑞集团公司(国网电力科学研究院),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]泉州亿兴电力工程建设有限公司,福建泉州362000

出　　处：《高压电器》2021年第9期34-42,共9页High Voltage Apparatus

基　　金：国家电网有限公司总部管理科技项目资助项目(5500-202126130A-0-0-00)。

摘　　要：由于采用管道密封绝缘输电,GIL系统受地形、天气和外界环境干扰较小,采用架空线—GIL混合系统输电会变得越来越普遍。当混合系统短路故障时,其电流分布将异于正常输电线路。为了明晰混合系统短路电流分流问题,文中首先建立了架空线—GIL混合输电系统模型,通过开关闭合操作模拟设置输电侧导线发生接地短路故障,GIL管廊内三相导线电流的增强倍数在1.01~2.08倍之间,且当发生三相接地短路故障时的电流增强倍数最高;设置GIL管廊内部导线发生接地短路故障,GIL管廊内三相导线电流的增强倍数在1.05~21.58倍之间,同样,当发生三相接地短路故障时的电流增强倍数最高,为GIL输电系统的安全性设计提供了技术支撑。GIL system is less disturbed by terrain,weather and external environment due to the adoption of pipe sealing insulation and transmission,therefore,the power transmission by the use of overhead line-GIL hybrid system will become more and more common. In case of short circuit fault of the hybrid system,its current distribution will be different from that of the normal transmission line. For clarifying short circuit current shunt of the hybrid system,the overhead line-GIL hybrid transmission system model is set up firstly in this paper. The current enhancement factor of three-phase conductor in GIL is between 1.01 and 2.08 through setting earth short circuit fault at the side of power transmission conductor by way of closing operation of the switch. The current enhancement factor in the case of threephase earthing short circuit fault is maximum. In case of setting the earthing short circuit fault of internal conductor of GIL,the current enhancement factor of three-phase conductor in the GIL is between 1.05 and 21.58. Similarly,the current enhancement factor in the case of three-phase earthing short circuit fault is maximum,which has provided technical support for the safe design of the GIL transmission system.

关 键 词：架空线—GIL混合系统 短路电流 电流分布 GIL本体导线 终端场 

分 类 号：TM75[电气工程—电力系统及自动化]