摘要
针对±800 kV宾金直流工程发生的＂7.13＂直流接地极线路烧毁故障,使用电力系统分析软件MATLAB Sim Power Systems建立电磁暂态仿真模型,对直流系统不同运行方式下高压侧接地引起的直流接地极线路内部过电压特征及分布进行了分析,量化了接地极线路内部过电压水平。分析表明特高压接地极线路内部过电压与接地极线路长度、直流系统运行方式、出线避雷器参数有关;宾金直流工程宜宾侧接地极线路最大内部过电压幅值为278 kV,金华侧接地线路最大内部过电压幅值为60 kV;宜宾侧接地极线路绝缘子并联间隙干弧距离设计为20 cm,在故障时刻绝缘配合失效是引起＂7.13＂故障的原因。
Taking the ＂7.13＂ fault of ± 800 kV Yibin-Jinhua DC project as an analysis object, we established a simulation model by using the power system analysis software MATLAB Sim Power Systems. The internal overvoltage characteristics and distribution of the grounding circuit of the UHVDC system were analyzed and the grounding line internal overvoltage level was quantitatively calculated. The analysis shows that the overvoltage inside the UHV grounding circuit depends on the grounding line length, system operation mode, and outgoing arrester parameters. The maximum internal overvoltage amplitude of grounding line is 278 kV on Yibin station side and 60 kV on Jinhua station side. The dry arc distance of grounding line shunt protective gap on Yibin station side was set to 20 cm, which causes failure of insulation coordination at ＂7.13＂ accident.
作者
刘守豹
皇甫成
余世峰
曾宏
雷潇
廖文龙
LIU Shoubao;HUANGFU Cheng;YU Shifeng;ZENG Hong;LEI Xiao;LIAO Wenlong(State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China;State Grid Jibei Electric Power Company Limited,Beijing 100053,China;State Grid Economic and Technological Research Institute Co.,Ltd,Beijing 102209,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第7期2410-2417,共8页
High Voltage Engineering
关键词
特高压直流
接地极线路
电磁暂态
内部过电压
避雷器
绝缘子并联间隙
UHVDC
grounding electrode line
electromagnetic transient
internal overvoltage
arrester
shunt protective gap
