外部短路含非周期分量的变压器差流仿真计算  

The Simulation and Calculation of Transformer Protection Differential Current on Aperiodic Component in Short-circuit Current at Event Outside

作　　者：张兵海 张卫明 郭少飞 王心蕊 李铁成 ZHANG Binghai;ZHANG Weiming;GUO Shaofei;WANG Xinrui;LI Tiecheng(State Grid Hebei Electric Power Research Institute Shijazhuang 050021,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021

出　　处：《河北电力技术》2023年第2期82-85,94,共5页Hebei Electric Power

摘　　要：针对外部故障时变压器差动保护偶发误动的问题,通过对差动保护的差流进行相应工况的仿真计算,认为电流互感器对短路电流中的非周期分量的传变误差产生较大差流是导致保护误动的主要原因,提出了电流互感器参数选择和保护定值调整等防止保护误动的措施。Aiming at the problem of occasional misoperation of transformer differential protection in the case of external faults,this paper does research on the simulation and calculation of the differential current,and gives the views of that,the aperiodic component transformed error by the current transformer is the main cause of getting higher differential current,and gives measures to avoid the protection misopration by appropriate parameter of current transformer and the modification of the setting.

关 键 词：变压器 差动保护 差流 PSCAD 

分 类 号：TM712[电气工程—电力系统及自动化]