直流输电线路雷击情况下行波保护误动分析  

Maloperation Analysis of Travelling Wave Protection under Lightning Strike of DC Transmission Line

作　　者：范其丽[1] 郑晓茜[1] 王璞 冯越 

机构地区：[1]郑州职业技术学院,郑州450121 [2]国网驻马店供电公司,河南驻马店463000

出　　处：《电瓷避雷器》2017年第6期161-165,171,共6页Insulators and Surge Arresters

摘　　要：在直流工程运行中,存在直流线路受雷电的干扰,从而导致直流线路行波保护发生误动的案例。为此,基于实际运行中某直流工程的EMTDC/PSCAD仿真模型,对雷电流以及雷击线路的不同方式进行了准确建模。在此基础上,详细分析了直流线路在雷击情况下发生非故障性绕击、故障性绕击以及反击时的暂态过程,并对行波保护3个判据d U/dt、ΔU、ΔI的动态响应特性进行了分析。结合行波保护的动作结果,提出在雷电干扰下行波保护误动的原因是由于直流线路间强烈的电磁耦合导致特征量发生突变,从而错误地满足了其门槛值,为提高直流线路行波保护的可靠性提供参考。In the practical running of the HVDC, it is risked that if a lightning current attacks, the traveling ,save protection may be maloperation. Based on a practical HVDC model in EMTDC/PSCAD, the paper builds a correct lightning model and the model of different ways about lightning current attacks. The paper analyzes transient process of voltage when non-fault shielding failure, fault shielding failure and back flashover occurs, and studies the dynamic response of three protection criteria： dU/dt, AU, AI under lightning. Comparing response of travelling wave protection, The analysis shows that when a line has been struck by lightning, there will be a drastic fluctuation in electrical quantities made by electro- magnetic coupling between circuits and will cause the response of protection criteria exactly satisfies a set time series, which is an important reason in the traveling wave maloperation. Therefore, the paper put for- ward an reference to improve the reliability of traveling wave protection.

关 键 词：高压直流输电 雷击线路 行波保护误动 

分 类 号：TM863[电气工程—高电压与绝缘技术]