GE 745 Instruction Manual page 120

AUTO-CONFIGURATION
5.2.7 Phase Shifts
5–24
The table below provides additional information about the Phase shift column in Table 5–
1: Transformer types on page 5–13 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 shift Input phasors Output phasors Phasor transformation
0°
30° lag
60° lag
90° lag
120° lag
150° lag
180° lag
210° lag
240° lag
270° lag
300° lag
330° lag
a = A
b = B
c = C
a = (A – C) /
b = (B – A) /
c = (C – B) /
3
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) /
a = –A
b = –B
c = –C
a = (C – A) /
b = (A – B) /
c = (B – C) /
3
a = C
b = A
c = B
a = (C – B) /
b = (A – C) /
c = (B – A) /
3
a = –B
b = –C
c = –A
a = (A – B) /
b = (B – C) /
c = (C – A) /
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
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