Note: Before starting this test, for easy calculation & to get correct readings In the relay configuration, Setting Group A, power system data 2 Address (1116-1119): setting for Zero Sequence Compensation Factors RE / RL =0 & XE / XL = 0, Also Zero Sequence Compensation Factors in the Tester setting should be Zero Inject the impedance ( Z ) = --- Ω with angle = ----o ( in Forward Side ) Calculate: R= Z x Φ , X= Z x SIN Φ Then read and record measurement the impedance ----- (Z) (Primary & Secondary) Inject the impedance (Z) = -------Ω with angle = ----- o (in Reverse Side) Calculate: R= Z x Φ , X= Z x SIN Φ Then read and record the measurement impedance ----- (Z) (Primary & Secondary) Note: [C.T ratio = ------] & [V.T ratio = -------- K.V] = ------- Φ = --o Φ = ---o Calculated Measured Z Calculated Measured Z Phase Impedance Z Z Primary Secondary Primary RL1 L1 - N XL1 RL2 L2 - N XL2 RL3 L3 - N XL3 RL12 L1 – L2 XL12 RL23 L2 – L3 XL23 RL31 L3 – L1 XL31 The Primary measured values = Secondary measured values * [V.T ratio / C.T ratio] = -----------
Note: Before starting this test, for easy calculation & to get correct readings In the relay configuration, Setting Group A, power system data 2 Address (1116-1119): setting for Zero Sequence Compensation Factors RE / RL =0 & XE / XL = 0, Also Zero Sequence Compensation Factors in the Tester setting should be Zero Inject the impedance ( Z ) = --- Ω with angle = ----o ( in Forward Side ) Calculate: R= Z x Φ , X= Z x SIN Φ Then read and record measurement the impedance ----- (Z) (Primary & Secondary) Inject the impedance (Z) = -------Ω with angle = ----- o (in Reverse Side) Calculate: R= Z x Φ , X= Z x SIN Φ Then read and record the measurement impedance ----- (Z) (Primary & Secondary) Phase Impedance Φ = --o Φ = ---o Calculated Z Measured Z Calculated Z Measured Z Primary Secondary Primary L1 - N RL1 XL1 L2 - N RL2 XL2 L3 - N RL3 XL3 L1 – L2 RL12 XL12 L2 – L3 RL23 XL23 L3 – L1 RL31 XL31 Note: [C.T ratio = ------] & [V.T ratio = -------- K.V] = ------- The Primary measured values = Secondary measured values * [V.T ratio / C.T ratio] = -----------