Effect on relay protection of installing method of independent CT

Performances of relay protection is related to the primary winding's polarity of independent CT with its installing method closely.Incorrect installing method may cause different performances of relay protection,which maybe enlarge the influence of forced outage.Through analyzing and comparing with the influences to varying relay protection caused by different installing method of CT,correct installing method of CT are given,and at the same time some remedial measures with their defects are proposed.The ECT is commended to completely solve the influence caused by incorrect installing methods of independent CT to the relay protection,which has smart and convenient performances and different secondary theories.