超高压输电线路风偏故障原因分析  

作　　者：张立明 马立 曹铖 

机构地区：[1]国网湖北省电力有限公司超高压公司,湖北宜昌443002

出　　处：《科技创新与应用》2023年第36期141-144,共4页Technology Innovation and Application

摘　　要：超高压输电线路所处地理环境复杂,极易受到风、覆冰等自然因素的影响,特别是强风天气下可能会发生风偏闪络故障,对输电线路的安全稳定运行造成极大的威胁。该文针对湖北省发生的一起500 kV输电线路风偏闪络故障,通过对输电铁塔结构、天气实际数据及现场故障状况进行分析,总结故障发生的原因,为线路整改措施制定提供参考。经计算该线路绝缘子串在原设计气象条件下实际摇摆角为53.3°,小于允许摇摆角54.58°,而在故障期间短时风速31.8 m/s下的风偏角超过允许摇摆角,导致电气间隙不满足安全距离,产生风偏放电现象。The geographical environment of EHV transmission lines is complex,which is easily affected by wind,icing and other natural factors,especially wind flashover faults may occur in strong wind weather,which poses a great threat to the safe and stable operation of transmission lines.In view of a 500 kV transmission line wind bias flashover fault occurred in Hubei Province,this paper summarizes the causes of the fault by analyzing the structure of the transmission tower,the actual weather data and the field fault condition,so as to provide reference for the formulation of line rectification measures.It is calculated that the actual swing angle of the insulator string of the line is 53.3°under the original design weather conditions,which is less than the allowable swing angle of 54.58°.During the fault,the wind deflection angle under the short-term wind speed of 31.8 m/s exceeds the allowable swing angle,resulting in the electrical gap does not meet the safe distance,resulting in the phenomenon of wind bias discharge.

关 键 词：超高压输电线路 闪络放电 故障分析 风偏计算 摇摆角 

分 类 号：TM752[电气工程—电力系统及自动化]