GE D30 Instruction Manual page 332
Line distance
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8.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
Table 8–10: PHASE DISTANCE INPUT SIGNALS FOR WYE-DELTA TRANSFORMERS
TRANSFORMER
LOOP
CONNECTION
Yd1
AB
8
BC
CA
Yd3
AB
BC
CA
Yd5
AB
BC
CA
Yd7
AB
BC
CA
Yd9
AB
BC
CA
Yd11
AB
BC
CA
8-12
CURRENT
TRANSFORMATION
1
------ - 2I
(
)
I
I
I
=
–
–
AB_21P
A
B
C
3
1
------ - 2I
(
)
I
I
I
=
–
–
BC_21P
B
A
C
3
1
------ - 2I
(
)
I
I
I
=
–
–
CA_21P
C
A
B
3
1
------ - I
(
)
I
I
2I
=
+
–
AB_21P
A
B
C
3
1
------ - I
(
)
I
I
2I
=
+
–
BC_21P
B
C
A
3
1
------ - I
(
)
I
I
2I
=
+
–
CA_21P
A
C
B
3
1
------ - 2I
(
)
I
I
I
=
–
–
AB_21P
B
A
C
3
1
I
------ - 2I
(
I
I
)
=
–
–
BC_21P
C
A
B
3
1
I
------ - 2I
(
I
I
)
=
–
–
CA_21P
A
B
C
3
1
I
------ - I
(
I
2I
)
=
+
–
AB_21P
B
C
A
3
1
------ - I
I
(
I
2I
)
=
+
–
BC_21P
A
C
B
3
1
------ - I
I
(
I
2I
)
=
+
–
CA_21P
A
B
C
3
1
------ - 2I
(
)
I
I
I
=
–
–
AB_21P
C
A
B
3
1
------ - 2I
(
)
I
I
I
=
–
–
BC_21P
A
B
C
3
1
------ - 2I
(
)
I
I
I
=
–
–
CA_21P
B
A
C
3
1
------ - I
(
)
I
I
2I
=
+
–
AB_21P
A
C
B
3
1
------ - I
(
)
I
I
2I
=
+
–
BC_21P
A
B
C
3
1
------ - I
(
)
I
I
2I
=
+
–
CA_21P
B
C
A
3
D30 Line Distance Relay
8 THEORY OF OPERATION
VOLTAGE
TRANSFORMATION
V
3V
=
AB_21P
A
V
3V
=
BC_21P
B
V
3V
=
CA_21P
C
V
3V
=
–
AB_21P
C
V
3V
=
–
BC_21P
A
V
3V
=
–
CA_21P
B
V
3V
=
AB_21P
B
V
3V
=
BC_21P
C
V
3V
=
CA_21P
A
V
3V
=
–
AB_21P
A
V
3V
=
–
BC_21P
B
V
3V
=
–
CA_21P
C
V
3V
=
AB_21P
C
V
3V
=
BC_21P
A
V
3V
=
CA_21P
B
V
3V
=
–
AB_21P
B
V
3V
=
–
BC_21P
C
V
3V
=
–
CA_21P
A
GE Multilin
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