GE G60

GE Multilin G60 Generator Protection System 8-3
8 THEORY OF OPERATION 8.1 PHASE DISTANCE THROUGH POWER TRANSFORMERS
8
Table 8–2: PHASE DISTANCE INPUT SIGNALS FOR WYE-DELTA TRANSFORMERS
TRANSFORMER
CONNECTION
LOOP CURRENT
TRANSFORMATION
VOLTAGE
TRANSFORMATION
Yd1 AB
BC
CA
Yd3 AB
BC
CA
Yd5 AB
BC
CA
Yd7 AB
BC
CA
Yd9 AB
BC
CA
Yd11 AB
BC
CA
I
AB_21P
1
3
-------
2I
A
I
B
– I
C
–()=
V
AB_21P
3V
A
=
I
BC_21P
1
3
-------
2I
B
I
A
– I
C
–()=
V
BC_21P
3V
B
=
I
CA_21P
1
3
-------
2I
C
I
A
– I
B
–()=
V
CA_21P
3V
C
=
I
AB_21P
1
3
-------
I
A
I
B
2I
C
–+()=
V
AB_21P
3V
C
–=
I
BC_21P
1
3
-------
I
B
I
C
2I
A
–+()=
V
BC_21P
3V
A
–=
I
CA_21P
1
3
-------
I
A
I
C
2I
B
–+()=
V
CA_21P
3V
B
–=
I
AB_21P
1
3
-------
2I
B
I
A
– I
C
–()=
V
AB_21P
3V
B
=
I
BC_21P
1
3
-------
2I
C
I
A
– I
B
–()=
V
BC_21P
3V
C
=
I
CA_21P
1
3
-------
2I
A
I
B
– I
C
–()=
V
CA_21P
3V
A
=
I
AB_21P
1
3
-------
I
B
I
C
2I
A
–+()=
V
AB_21P
3V
A
–=
I
BC_21P
1
3
-------
I
A
I
C
2I
B
–+()=
V
BC_21P
3V
B
–=
I
CA_21P
1
3
-------
I
A
I
B
2I
C
–+()=
V
CA_21P
3V
C
–=
I
AB_21P
1
3
-------
2I
C
I
A
– I
B
–()=
V
AB_21P
3V
C
=
I
BC_21P
1
3
-------
2I
A
I
B
– I
C
–()=
V
BC_21P
3V
A
=
I
CA_21P
1
3
-------
2I
B
I
A
– I
C
–()=
V
CA_21P
3V
B
=
I
AB_21P
1
3
-------
I
A
I
C
2I
B
–+()=
V
AB_21P
3V
B
–=
I
BC_21P
1
3
-------
I
A
I
B
2I
C
–+()=
V
BC_21P
3V
C
–=
I
CA_21P
1
3
-------
I
B
I
C
2I
A
–+()=
V
CA_21P
3V
A
–=