Phase Shifts - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

5.2 AUTO-CONFIGURATION
The table below provides additional information about the Phase Shift column in Table 5–1: Transformer Types on page 5–
10 and represents an assumed ABC phasor rotation. For transformers connected to a system with a phasor rotation of
ACB, interchange all B (b) and C (c) designations.
Table 5–2: PHASE SHIFTS
PHASE INPUT
SHIFT PHASORS
0°
30° lag
60° lag
90° lag
5
120° lag
150° lag
5-22
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OUTPUT PHASOR
PHASORS TRANSFORMATION
a = A
b = B
c = C
a = (A – C) /
b = (B – A) /
c = (C – B) /
a = –C
b = –A
c = –B
a = (B – C) /
b = (C – A) /
c = (A – B) / 3
a = B
b = C
c = A
a = (B – A) /
b = (C – B) /
c = (A – C) /
745 Transformer Management Relay
PHASE INPUT
SHIFT PHASORS
180° lag
3
210° lag
3
3
240° lag
3
270° lag
3
300° lag
3
330° lag
3
3
5 SETPOINTS

5.2.7 PHASE SHIFTS

OUTPUT PHASOR
PHASORS TRANSFORMATION
a = –A
b = –B
c = –C
a = (C – A) / 3
b = (A – B) / 3
c = (B – C) / 3
a = C
b = A
c = B
a = (C – B) / 3
b = (A – C) / 3
c = (B – A) / 3
a = –B
b = –C
c = –A
a = (A – B) / 3
b = (B – C) / 3
c = (C – A) / 3
GE Multilin