GE D30 Instruction Manual page 424

9.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
Table 9–9: 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
9
Dy11 AB
BC
CA
9-12
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 Protection System
9 THEORY OF OPERATION
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
GE Multilin