Differential Relay Current Measurement (for Digital relays) Phase DIFF Relay Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B Sensitivity Test by swapping CT Terminals : Secondary measurements Diff. ( side) Diff. relay (HV side) Side HV Side Phase I (mA) T.B. I (mA) I sec. (mA) I pri. (A) I sec. (mA) T.B. I pri. (A) R Y B N Differential Relay Current Measurement (for Digital relays) Phase DIFF Relay Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B
Transformer differential stability and sensitivity test for tap no ------ stability test Primary measurements Source V&I B-R Y-B R-Y N B Y R V (V) I (A) Secondary measurements Diff. relay ( side) Diff. relay (HV side) Side HV Side Phase I (mA) T.B. I (mA) T.B. I sec. (mA) T.B. I pri. (A) I sec. (mA) I pri. (A) R Y B N Differential Current Measurement(for Digital relays) Phase DIFF Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B Sensitivity Test by swapping CT Terminals :
Secondary measurements Diff. relay ( side) Diff. relay (HV side) Side HV Side I (mA) T.B. I (mA) T.B. I sec. (mA) T.B. I pri. (A) I sec. (mA) T.B. I pri. (A) R Y B N Differential Relay Current Measurement(for Digital relays) Phase DIFF Relay Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B Transformer differential stability and sensitivity test for tap no ------
stability test Primary measurements : Source V&I B-R Y-B R-Y N B Y R V (V) I (A) Secondary measurements: Diff. ( side) Diff. relay (HV side) Side HV Side Phase I (mA) T.B. I (mA) T.B. I sec. (mA) I pri. (A) I sec. (mA) I pri. (A) R Y B N Differential Relay Current Measurement (for Digital relays) Phase DIFF Relay Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B Sensitivity Test by swapping CT Terminals : Secondary measurements
Diff. relay ( side) Diff. relay (HV side) Side HV Side Phase I (mA) T.B. I (mA) T.B. I sec. (mA) T.B. I pri. (A) I sec. (mA) T.B. I pri. (A) R Y B N Differential Relay Current Measurement (for Digital relays) DIFF Relay Measurement HV side current A DIFF Relay Measurement side current A DIFF Current Id mA Restrain Current IR mA R Y B Stability And Sensitivity Of REF HV Side At Tap No ---- Stability test VRN= _______ VYN= _______ VBN= _______ Connected Supply to Phase I primary (A) Measured I secondary REF relay Wire From neutral CT Wire From CT's sum I (mA) V (V) I (mA) I(mA) T.B. No R-N Y-N B-N Sensitivity Test by Swapping CT Terminals : Connected Supply to Phase Measured I secondary REF relay Wire From neutral CT Wire From CT's sum
I primary (A) I (mA) I (mA) T.B. No R-N Y-N B-N Stability and sensitivity of REF HV Side at Tap No ---- Stability and sensitivity of REF HV Side at Tap No ---- VRN= _______ VYN= _______ VBN= _______ Connected Supply to I primary (A) Measured I secondary REF Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N Sensitivity Test by Swapping CT Terminals : Connected Supply to Phase I primary (A) Measured I secondary REF relay Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N Stability and sensitivity of REF HV Side at Tap No ---- Stability and sensitivity of REF HV Side at Tap No ---- VRN= _______ VYN= _______ VBN= _______
Connected Supply to I primary (A) Measured I secondary REF relay Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N Sensitivity Test by Swapping CT Terminals : Connected Supply to Phase I primary (A) Measured I secondary REF relay Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N Stability and sensitivity of REF Side at Tap No ---- Stability and sensitivity of REF HV Side at Tap No ---- VRN= _______ VYN= _______ VBN= _______ Measured I secondary REF
Connected Supply to Phase I primary (A) Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N Sensitivity Test by Swapping CT Terminals : Connected Supply to Phase I primary (A) Measured I secondary REF relay Wire From neutral CT Wire From CT's sum I (mA) V (V) I(mA) I(mA) T.B. No R-N Y-N B-N