GE 745 Instruction Manual page 109

CHAPTER 5: SETPOINTS
5.2.6 Transformer Types
Transformer Wdg. Connection
type
2W External 1
Correction
2
Y/y180° 1
2
Y/d150° 1
2
Y/d330° 1
2
D/d60° 1
2
D/d180° 1
2
D/d300° 1
2
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
A complete table of transformer types is shown below.
Table 5–1: Transformer types (Sheet 1 of 11)
Voltage Phase
phasors shift
WYE
(gnd 1/2)
WYE
(gnd 2/3)
0°
WYE 180°
(gnd 1/2)
WYE
(gnd 2/3)
180° lag
WYE 150°
(gnd 1/2)
DELTA
(gnd 2/3)
150° lag
WYE 330°
(gnd 1/2)
DELTA
(gnd 2/3)
330° lag
DELTA
(gnd 1/2)
DELTA
(gnd 2/3)
60° lag
DELTA 180°
(gnd 1/2)
DELTA
(gnd 2/3)
180° lag
DELTA 300°
(gnd 1/2)
DELTA
(gnd 2/3)
300° lag
Transformer Wdg.
type
0° Y/y0°
0°
Y/d30°
lag
0°
Y/d210°
lag
0°
D/d0°
lag
0°
60° D/d120°
lag
0°
D/d240°
lag
0°
D/y30°
lag
0°
AUTO-CONFIGURATION
Connection Voltage
phasors
1 WYE
(gnd 1/2)
2 WYE
(gnd 2/3)
0°
1 WYE
(gnd 1/2)
2 DELTA
(gnd 2/3)
30° lag
1 WYE
(gnd 1/2)
2 DELTA
(gnd 2/3)
210° lag
1 DELTA
(gnd 1/2)
2 DELTA
(gnd 2/3)
0°
1 DELTA
(gnd 1/2)
2 DELTA
(gnd 2/3)
120° lag
1 DELTA
(gnd 1/2)
2 DELTA
(gnd 2/3)
240° lag
1 DELTA
(gnd 1/2)
2 WYE
(gnd 2/3)
30° lag
Phase
shift
0°
0°
30° lag
0°
210°
lag
0°
0°
0°
120°
lag
0°
240°
lag
0°
0°
330°
lag
5–13