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.
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)
出处
《河北电力技术》
2023年第2期82-85,94,共5页
Hebei Electric Power
关键词
变压器
差动保护
差流
PSCAD
transformer
differential protection
differential current
PSCAD
