Posted on June 12, 2020 at 3:49am
Test Procedure for knee point Voltage calculation of CT :
1.Disconnect the CT from all external connection
2.Note down the knee point voltage of CT ( as per datasheet of the CT).
3. Apply 5-10 % voltage of the knee point voltage to the secondary of the
CT by auto-transformer. Note down the secondary current.
4.Increase the voltage gradually to 20,30,40,50,60,70,80,90 % of the
rated knee point of the CT and note down the secondary current.
5. Now increase… Continue