GE D30 Instruction Manual page 331
Line distance
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8 THEORY OF OPERATION
Table 8–9: PHASE DISTANCE INPUT SIGNALS FOR DELTA-WYE TRANSFORMERS
TRANSFORMER
LOOP
CONNECTION
None
AB
BC
CA
Dy1
AB
BC
CA
Dy3
AB
BC
CA
Dy5
AB
BC
CA
Dy7
AB
BC
CA
Dy9
AB
BC
CA
Dy11
AB
BC
CA
GE Multilin
8.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
CURRENT
TRANSFORMATION
I
I
–
A
B
I
I
–
B
C
I
I
–
C
A
3I
A
3I
B
3I
C
I
3I
=
–
AB_21P
C
I
3I
=
–
BC_21P
A
I
3I
=
–
CA_21P
B
I
3I
=
–
AB_21P
B
I
3I
=
–
BC_21P
C
I
3I
=
–
CA_21P
A
I
3I
=
–
AB_21P
A
I
3I
=
–
BC_21P
B
I
3I
=
–
CA_21P
C
I
3I
=
–
AB_21P
C
I
3I
=
–
BC_21P
A
I
3I
=
–
CA_21P
B
I
3I
=
–
AB_21P
B
I
3I
=
–
BC_21P
C
I
3I
=
–
CA_21P
A
D30 Line Distance Relay
VOLTAGE
TRANSFORMATION
V
AB
V
BC
V
CA
1
------ - V
(
)
V
–
AB
CA
3
1
------ - V
(
)
V
–
BC
AB
3
1
------ - V
(
)
V
–
CA
BC
3
1
------ - V
(
)
V
V
=
–
AB_21P
BC
CA
3
1
------ - V
(
)
V
V
=
–
BC_21P
CA
AB
3
1
------ - V
(
)
V
V
=
–
CA_21P
AB
BC
3
1
------ - V
(
)
V
V
=
–
AB_21P
BC
AB
3
1
------ - V
(
)
V
V
=
–
BC_21P
CA
BC
3
1
V
------ - V
(
V
)
=
–
CA_21P
AB
CA
3
1
V
------ - V
(
V
)
=
–
AB_21P
CA
AB
3
1
V
------ - V
(
V
)
=
–
BC_21P
AB
BC
3
1
------ - V
V
(
V
)
=
–
CA_21P
BC
CA
3
1
------ - V
V
(
V
)
=
–
AB_21P
CA
BC
3
1
------ - V
(
)
V
V
=
–
BC_21P
AB
CA
3
1
------ - V
(
)
V
V
=
–
CA_21P
BC
AB
3
1
------ - V
(
)
V
V
=
–
AB_21P
AB
BC
3
1
------ - V
(
)
V
V
=
–
BC_21P
BC
CA
3
1
------ - V
(
)
V
V
=
–
CA_21P
CA
AB
3
8
8-11
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