融冰绝缘地线架设对变电站接地网的安全影响分析  

Analysis of Ice-Melting Insulated Ground Wire Influence on Substation Grounding Safety

作　　者：陈奎[1] 吴广宁[1] 曹晓斌[1] 李瑞芳[1] 易志兴 罗蜀彩 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031 [2]四川省电力公司检修公司,四川省成都市610041

出　　处：《电网技术》2015年第12期3656-3662,共7页Power System Technology

基　　金：铁道部重大专项课题(2011T008);中央高校基本科研业务费专项资金资助(2682014CX022)~~

摘　　要：为对地线进行直流融冰,地线进行了融冰绝缘化改造。地线绝缘化改造将会影响短路电流在变电站地网和地线中的分配,从而影响变电站接地网的安全。利用ATP-EMTP软件建立地线融冰绝缘化改造的变电站短路模型,研究了融冰绝缘地线架设对变电站地网安全的影响,并提出改进地网安全的措施。研究结果表明：融冰绝缘架设地线将会导致变电站地网分流系数增大,从而影响变电站的接地安全;融冰绝缘架设地线的地网分流系数变化主要受变电站接地电阻和输电线路进出回路数影响;对于地网分流系数设计小于50%的变电站,应重新校验地线绝缘化后的跨步电压和接触电压;变电站附近杆塔的地线接地可有效提高变电站地网安全性能,最佳接地杆塔基数为6~8基。In order to directly melt ice accumulated on ground wire with direct current（DC）, ground wire shall be transformed into insulated one. Erection mode of ice-melting insulated ground wire changing distribution of short-circuit current among substation grounding net has effect on substation grounding safety. Model of substation with insulated ground wire under short-circuit fault is built using ATP-EMTP simulation software. Influence of erection mode of ice-melting insulated ground wire on substation grounding safety is investigated, and improvement measures for substation grounding safety is recommended. Research results show that erection mode of ice-melting insulated ground wire will cause increase of grounding net shunt coefficient, and affect substation grounding safety. Grounding net shunt coefficient is affected mainly by substation grounding resistance and number of transmission lines coming in and out of the substation. For substations with grounding net shunt coefficient less than 50%, after erection of ice-melting insulated ground wire, step voltage and touch voltage of grounding net should be checked again. Safety performance of grounding net is improved due to insulated ground wire near substation grounding, and optimal number of grounding towers are 6 to 8.

关 键 词：直流融冰 融冰绝缘地线 变电站 短路故障 分流系数 跨步电压 

分 类 号：TM86[电气工程—高电压与绝缘技术]