摘要
通过分析变压器纵差保护在保护变压器单相接地故障时灵敏度的不足,论述了变压器配置零序差动保护的必要性。但由于人为原因,比如零序电流互感器极性接线错误、定值误整定、零序电流互感器选型错误等,变压器零序差动保护误动事故时有发生。这些零序差动保护的错误无法通过正常负荷电流进行校验,因而限制了零序差动保护的推广应用。通过为零序差动保护配置自校验功能,利用变压器空投励磁涌流校验零序差动保护回路的正确性,并通过动模测试和验证试验证明了自校验功能的正确性。自校验功能不需要人工参与且可靠实用,可防范人为错误导致的零差保护误动事故。
Because of insufficient sensitivity of the transformer differential protection in protecting the single-phase ground fault,the necessity of the zero-sequence differential protection of the transformer is discussed.However,due to human factors,such as zero-sequence current transformer wiring error,protection setting error,zero-sequence current transformer selecting error,and so on,zero-sequence differential protection incorrect action accidents often occur.These errors of zero-sequence differential protection cannot be verified by the normal load current,which limit the application of zero-sequence differential protection.In this paper,the zero-sequence differential protection is configured with self-checking function,which uses the magnetizing inrush current to verify the correctness of zero-sequence protection circuit,and is proved to be correct by dynamic simulation and experiment test.The self-checking function does not require manual participation,is reliable and practical,and can effectively prevent incorrect action of zero sequence protection caused by human error.
作者
陆明
薛磊
余江
兀鹏越
郭霞
LU Ming;XUE Lei;YU Jiang;WU Pengyue;GUO Xia(Power Grid Power Dispatching Control Center,CSG,Guangzhou 510663,China;Xi an Thermal Power Research Institute Co.,Ltd.,Xi an 710054,China)
出处
《南方电网技术》
北大核心
2018年第10期35-40,共6页
Southern Power System Technology
关键词
变压器
零序差动保护
自校验技术
transformer
zero sequence differential protection
self checking technology
