GE D60 Instruction Manual page 527

9 THEORY OF OPERATION
Table 9–10: PHASE DISTANCE INPUT SIGNALS FOR WYE-DELTA TRANSFORMERS
TRANSFORMER LOOP
CONNECTION
Yd1 AB
BC
CA
Yd3 AB
BC
CA
Yd5 AB
BC
CA
Yd7 AB
BC
CA
Yd9 AB
BC
CA
Yd11 AB
BC
CA
GE Multilin
9.2 PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
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
D60 Line Distance Protection System
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
9
9-13