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CHAPTER 6: SETPOINTS
Transformer
Type
D/d300°
D/y150°
D/y330°
Y/z150°
Y/z330°
D/z60°
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Wdg. Connection
Voltage
Phase
Phasors
Shift
(Φ
1
DELTA (gnd 1/
300° lag
2)
2
DELTA (gnd 2/
0°
3) 300° lag
1
DELTA (gnd 1/
0°
2)
2
WYE (gnd 2/3)
210° lag
150° lag
1
DELTA (gnd 1/
0°
2)
2
WYE (gnd 2/3)
30° lag
330° lag
1
WYE (gnd 1/2)
150° lag
2
ZIG-ZAG (gnd
0°
2/3) 150° lag
1
WYE (gnd 1/2)
330° lag
2
ZIG-ZAG (gnd
0°
2/3) 330° lag
1
DELTA (gnd 1/
60° lag
2)
2
ZIG-ZAG (gnd
0°
2/3) 60° lag
Transformer
Wdg. Connection
Type
)
comp
D/y30°
1
DELTA (gnd 1/
2)
2
WYE (gnd 2/3)
30° lag
D/y210°
1
DELTA (gnd 1/
2)
2
WYE (gnd 2/3)
210° lag
Y/z30°
1
WYE (gnd 1/2)
2
ZIG-ZAG (gnd
2/3) 30° lag
Y/z210°
1
WYE (gnd 1/2)
2
ZIG-ZAG (gnd
2/3) 210° lag
D/z0°
1
DELTA (gnd 1/
2)
2
ZIG-ZAG (gnd
2/3) 0° lag
D/z120°
1
DELTA (gnd 1/
2)
2
ZIG-ZAG (gnd
2/3) 120° lag
S2 SYSTEM SETUP
Voltage
Phase
Phasors
Shift
(Φ
)
comp
0°
330° lag
0°
150° lag
30° lag
0°
210° lag
0°
0°
0°
120° lag
0°
6–57
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