主变方向过流保护拒动原因分析  

Analysis of Transformer Directional Over Current Protection Refuse to Operate

作　　者：曹举 顾沈卉 魏李程 刘熹 CAO Ju;GU Shenhui;WEI Licheng;LIU Xi(Changqing Water and Power Supply Department,Xi′an 710201,China)

机构地区：[1]长庆油田水电厂,陕西西安710201

出　　处：《电工技术》2021年第17期87-88,共2页Electric Engineering

摘　　要：针对某变电站主变10 kV方向过流保护拒动情况,从保护原理、现场接线、定值设置等方面,分析电流互感器的极性选择及方向元件控制字的设置对短路功率方向的影响,提出规范二次接线、合理设置控制字等防止保护拒动和误动的相关措施,确保方向过流保护动作的正确性。According to the situation of 10 kV directional over-current protection refuse to operate,the influence of current transformer polarity selection and direction element control word setting on short-circuit power direction is analyzed from the aspects of protection principle,field wiring and setting of setting value.To ensure the correctness of directional over-current protection action,the relevant measures such as standardizing the secondary wiring and reasonably setting the control word are proposed to prevent the protection from refusing to operate and maloperation.

关 键 词：过流保护 方向元件 拒动 

分 类 号：TM07[电气工程—电工理论与新技术]