隧道中GIL载流量解析计算方法研究  

Research on Analytical Calculation Method of GIL Ampacity in Tunnel

作　　者：岳浩 李健 罗楚军 吴庆华 YUE Hao;LI Jian;LUO Chujun;WU Qinghua(Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China;HVDC Technology Department of China Energy Engineering Group Engineering Institute,Wuhan 430071,China)

机构地区：[1]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [2]中国能建工程研究院高压直流技术研究所,湖北武汉430071

出　　处：《电力勘测设计》2023年第6期16-22,共7页Electric Power Survey & Design

摘　　要：气体绝缘线路(gas insulated line,GIL)因其输送容量大、可靠性高、损耗小、使用寿命长、节约线路走廊等优点,在国内获得广泛应用。目前多采用数值仿真方法计算GIL载流量,国内尚无GIL载流量解析计算方法的规程规范。文章根据GIL结构及热回路特点,对比GIL与电缆的热回路差异,提出了GIL载流量解析计算方法,对GIL导体及外壳交流电阻、绝缘气体热阻及GIL外部介质热阻计算公式进行了详细分析,并通过计算分析了隧道内GIL载流量影响因素。结果表明,增加隧道通风风速、降低导体及外壳电阻率、适当增大气体压强可以提高GIL载流量,隧道埋深、隧道周围土壤电阻率及GIL相间距离对GIL载流量无明显影响。Gas insulated line(GIL) has been widely used in China due to its advantages of large transmission capacity,high reliability,low loss,long life,and saving line corridors.The calculation of GIL ampacity method is numerical simulation method now.There is no specification for analytical calculation method of GIL ampacity.According to the GIL structure and thermal circuit characteristics,the analytical calculation method of GIL ampacity is proposed comparing the differences between the GIL and the cable.The calculation formula of GIL conductor and shell AC resistance,insulation gas thermal resistance and GIL external medium thermal resistance is analyzed in detail.The factors affecting the GIL ampacity in the tunnel are calculated and analyzed.The research results show that the GIL ampacity can be increased by increasing the tunnel ventilation wind speed,reducing the conductor and shell resistivity,and increasing the gas pressure properly.The buried depth of the tunnel,the soil resistivity around the tunnel and the distance between GIL phases has no significant impact on the GIL ampacity.

关 键 词：气体绝缘线路 载流量 热阻 

分 类 号：TM751[电气工程—电力系统及自动化]