架空输电线路雷电绕击与反击的识别.pdf

架空输电线路雷电绕击与反击的识别.pdf第卷第冢高电压技术 V0140No92885-2893
2014930 Voltage Engineering September ,
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架空输电线路雷电绕击与反击的识别
杜 1寰律偾,罗涛罱
.重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆;
拇ㄊ〉缌镜缌蒲а芯吭海啥
摘要:为准确辨识输电线路雷击故障,分析了雷电绕击和反击的发生机理,并基于狤⒘
输电线路杆塔多波阻抗模型及雷击仿真模型进行仿真。结果表明:雷击杆塔塔顶或绕击导线时,绝缘子串两端电
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效值作为识别判据,对雷击故障及未故障条件下的雷击类型进行辨识。
关键词:反击:绕击;故障识别;输电线路;绝缘子串电位差;杆塔入地电流
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chanism and shielding failurewesimulated and studied 1 multiwave
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insulator voltage differs between shielding failure and . there insulator flashover,the voltage
insulator decreases zeroandafter the transient process lightning endsthevoltage insulator
ers decreases . there flashover,the direction insulator voltage tower .
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and tower current are the 琣 their direction and effective ale the
for lightning .
Key 簊 failurebackstrikingfailure籶 lineinsulatorpotential ;
tower grounding current
对雷击故障类型进行辨识可以为防雷设计提供依
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据,有针对性地采取防雷措施,可提高线路防雷水平。
输电线路是电力系统的重要组成部分。运行经目前,已有学者针对雷击故障识别开展了相关
验表明,由雷击引起的线路跳闸在线路故障总数中研究,取得了一定成果。文献】提出利用故障暂态
j量零模和线模比值上的差异,区分感应雷过电压和
证电力系统安全稳定运行有重要意义。雷电绕击和短路故障,但未系统解决如何识别直击雷的问题。
反击所采取的防护手段不同:反击主要靠提高线路文献【以故障发生后一段时间内零