一次特殊的高压直流输电线路故障分析及线路保护优化  

Analysis of an HVDC Transmission Line Fault and Line Protection Optimization

作　　者：杨建明[1] 徐斌[1] 王杨正[1] 陈乐[1] 唐俊[1] 卢宇[1] 

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力工程技术》2017年第5期136-142,共7页Electric Power Engineering Technology

摘　　要：本文对国内某高压直流输电工程极一线路故障的波形进行分析,得出此次直流线路保护动作是雷电引起的结论。在对雷电资料进行检索和分析的基础上,对线路重启过程中极一产生-535 k V电压可能存在的原因进行逐一排除,最终总结出极一直流线路电压从+500 k V下降到-535 k V是由于雷电提供了整流侧逆变运行所需要的能量导致的。根据雷电反击和雷电绕击特性的不同提出了行波保护和电压突变量保护的优化策略,以防止雷电反击直流线路时造成行波保护和电压突变量保护的误动。The DC line fault waveform of a high voltage DC transmission project is analyzed in this paper, and the conclusion that the lightning strike was the action reason of DC line protection is drawn. Based on the retrieval and analysis of lightning data, all the potential causes that can lead the voltage of pole 1 to -535 kV are eliminated one by one. In the meantime, the lightning is also considered to provide the energy which was the reason of voltage variation from ＋500 kV to -535 kV. At last, optimization strategy of travelling wave protection and voltage derivative protection is proposed based on the characteristics of the lightning back flashover and the lightning shielding failure to prevent the two protection malfunction.

关 键 词：直流线路故障 雷电反击 雷电绕击 行波保护 电压突变量保护 优化策略 

分 类 号：TM773[电气工程—电力系统及自动化]