Differential protection,as the main protection of electrical equipment,plays a key role,so it is important to prevent the false operation and rejection of protection.Although the anti-saturation performance of current transformer(CT)is improving day by day at this stage,CT saturation is still a factor that interferes greatly with differential protection.Due to the different transmission characteristics of CT,especially when it is saturated,the current involved in the calculation of differential protection will be distorted,and the difference between the differential current and the actual situation of the primary side will be deviated,which may cause the differential protection to misoperate.A case of differential protection misoperation caused by the saturation of CT due to the short circuit outside the region is analyzed,and some suggestions for rectification is given.
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