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输电线路瞬时性故障的恢复电压直流偏移特性研究
罗勋华1, 黄 纯1, 戴永梁1, 潘志敏2, 刘 琨2, 梁勇超2
1.湖南大学 电气与信息工程学院,湖南 长沙 410012;2.湖南省电力公司检修公司,湖南 长沙 410004
摘要:
针对不带并联电抗器的超高压输电线路上发生的瞬时单相接地故障,建立故障分析电路模型,推导故障相端电压在熄弧前、后的时域表达式,分析表明熄弧后恢复电压将出现直流偏移,ATP-EMTP仿真结果验证了理论分析的正确性。根据理论分析和仿真结果,提出了自适应重合闸判据:当故障相端电压直流分量与基波电压幅值之比大于0.9,且持续时间超过20 ms时,发出重合闸命令。
关键词:  超高压输电  线路  单相自适应重合闸  瞬时性故障  恢复电压  直流偏移  接地  继电保护  故障分析
DOI:
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基金项目:基金项目:国家电网公司研究开发项目(5216A313500N)
DC offset characteristics of recovery voltage for transient transmission line fault
LUO Xunhua1, HUANG Chun1, DAI Yongliang1, PAN Zhimin2, LIU Kun2, LIANG Yongchao2
1.College of Electrical and Information Engineering,Hunan University,Changsha 410012,China;2.Hunan Electric Power Overhauling Company,Changsha 410004,China
Abstract:
A circuit model of EHV transmission line without shunt reactor is built for analyzing its transient single-phase grounding fault. The time-domain expression of terminal voltage is deduced for the faulty phase before and after arc extinction and the theoretical analysis shows that DC offset appears in the recovery voltage after the arc extinction,which is verified by the simulation with ATP-EMTP. A criterion of adaptive reclosure is proposed according to the simulative and analytical results:the reclosure command is issued only when the ratio of the DC component of faulty terminal voltage to the fundamental voltage amplitude is larger than 0.9 for longer than 20 ms.
Key words:  EHV power transmission  electric lines  single-pole adaptive reclosure  transient fault  recovery voltage  DC offset  electric grounding  relay protection  failure analysis

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