摘要
准确无误的电流互感器(CT)极性和保护方向是确保继电保护安全可靠运行的基础,大型发变组保护采用主后一体化的双重化配置模式,需要接入的CT电流回路较多,且部分CT电流回路同时供主保护、后备保护和异常运行保护共同使用,CT极性必须同时满足主保护、后备保护、异常运行保护的要求。由于大型发变组保护的配置及其二次回路的复杂性,导致CT极性和保护方向错误而引发的发变组保护误动或拒动的事情时有发生,严重影响了电网的安全稳定运行。根据传统人工带负荷检测CT极性和保护方向的"六角图理论",在发变组保护装置内构建了CT极性和保护方向自动检测的判据和功能,进一步提升了发变组保护的安全性和可靠性,具有很高的工程实用价值。
Accurate current transformer(CT)polarity and protection direction is the foundation to ensure the safe and reliable relay operation,and the large transformer unit protection adopts the main protection and backup protection integration,duplex configuration mode,which needs to access more CT current loops.And part of the CT current loop for protection within the main protection,backup protection and abnormal operation protect the common use,CT polarity must also meet the main protection,backup protection,abnormal operation protection requirements.Due to the protection of large transmission unit and the complexity of its secondary circuit,the CT polarity and protection of the wrong direction caused by the protection of the group to prevent malpractice or refusal to happen when things have seriously affected the safety and stability of the grid run.According to the hexagonal graph theory of detecting CT polarity and protection direction with traditional artificial load,the criterion and function of CT polarity and automatic detection of protection direction are constructed in the protection device of the transformer group,which further enhances the safety and reliability of generator protection group,and has high engineering practical value.
作者
李本瑜
陈海龙
刘志文
肖志刚
沈燕华
徐立明
Li Benyu;Chen Hailong;Liu Zhiwen;Xiao Zhigang;Shen Yanhua;Xu Liming(Yunnan Electric Power Dispatching and Controlling Center,Kunming 650011,China;XJ Electric Co.,Ltd.,Xuchang 461000,Henan,China)
出处
《电测与仪表》
北大核心
2018年第14期100-105,共6页
Electrical Measurement & Instrumentation
关键词
发电机差动保护
变压器差动保护
零序差动保护
CT极性
保护方向
自动检测
generator differential protection
transformer differential protection
zero sequence differential protection
CT polarity
protection direction
automatic detection
