Table Of Phase Shifts - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

5 SETPOINTS
This table 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 sys-
tem with a phasor rotation of ACB, interchange all B (b) and C (c) designations.
Table 5–2: PHASE SHIFTS
PHASE INPUT OUTPUT
SHIFT PHASORS PHASORS
0°
30° lag
60° lag
90° lag
120° lag
150° lag
GE Power Management
PHASOR PHASE
TRANSFORM ATION SHIFT
a = A 180° lag
b = B
c = C
a = (A – C) / √3
210° lag
b = (B – A) / √3
c = (C – B) / √3
a = –C 240° lag
b = –A
c = –B
a = (B – C) / √3
270° lag
b = (C – A) / √3
c = (A – B) / √3
a = B 300° lag
b = C
c = A
a = (B – A) / √3
330° lag
b = (C – B) / √3
c = (A – C) / √3
745 Transformer Management Relay
5.2 AUTO-CONFIGURATION

5.2.8 TABLE OF PHASE SHIFTS

INPUT OUTPUT
PHASORS PHASORS TRANSFORM ATION
PHASOR
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
5
c = (B – A) / √3
a = –B
b = –C
c = –A
a = (A – B) / √3
b = (B – C) / √3
c = (C – A) / √3
5-23