CALCULATED VALUE MEASURED VALUE APPLIED APPLIED IN CURRENT(A) CURRENT(A) PHASE % I DIFF I BIAS I DIFF I BIAS HV SIDE LV SIDE 1.5 R 2.0 1.5 Y 2.0 1.5 B 2.0 K1-30% Is1-0.4 * Pick-up: formula ±5% * Drop-off: 95% of formula ±5% (see technical manual P64×_112 page no: 40) SLOPE = (ID2-ID1)/ (IB2-IB1) ID----I DIFF IB----IBIASE B- Upper Slope Test: - IS2: Basic Diff Current Threshold Setting. - : High Percentage Bias Setting. - Id Calculated = I diff> K1 * Is2 + K2 ( Ibias Is2 ) – CALCULATED VALUE MEASURED APPLIED APPLIED PHASE CURRENT CURRENT (A) HV (A) LV SIDE SLOPE I DIFF I BIAS I DIFF I BIAS SIDE IN % R Y B Differential Setting (Is1=0.4 , Is2=2 , K1= 30%, K2=60%). K1-30% * Pick-up: formula ±5% * Drop-off: 95% of formula ±5% (see technical manual P64×_112 page no: 40) HARMONICS CHECK
PHASE APPLIED CURRENT(A) HV SIDE APPLIED CURRENT(A) LV SIDE CALCULATED VALUE MEASURED VALUE IN % I DIFF I BIAS I DIFF I BIAS R 1.5 2.0 Y 1.5 2.0 B 1.5 2.0 K1-30% Is1-0.4 * Pick-up: formula ±5% * Drop-off: 95% of formula ±5% (see technical manual P64×_112 page no: 40) ID----I DIFF IB----IBIASE SLOPE = (ID2-ID1)/ (IB2-IB1) B- Upper Slope Test: - IS2: Basic Diff Current Threshold Setting. - : High Percentage Bias Setting. - Id Calculated = I diff> K1 * Is2 + K2 ( Ibias – Is2 ) PHASE APPLIED CURRENT (A) HV SIDE APPLIED CURRENT (A) LV SIDE CALCULATED VALUE MEASURED SLOPE IN % I DIFF I BIAS I DIFF I BIAS R Y B Differential Setting (Is1=0.4 , Is2=2 , K1= 30%, K2=60%). K1-30% * Pick-up: formula ±5% * Drop-off: 95% of formula ±5% (see technical manual P64×_112 page no: 40) HARMONICS CHECK
transformer_diff_-_p643.docx