GE D30 Instruction Manual page 464

PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
Table 9-9: Phase distance input signals for delta-wye transformers
Transformer
connection
None
Dy1
Dy3
9
9-12
Figure 9-4: Applications of the "PHS DIST XF MR VOL/CUR CONNECTION" settings
(a)
delta wye, 330
Z3
Z3 XFRM VOL CONNECTION = None
Z3 XFRM CUR CONNECTION = None
Z1
Z1 XFRM VOL CONNECTION = Dy11
Z1 XFRM CUR CONNECTION = Dy11
(c)
delta wye, 330
Z3
Z3 XFRM VOL CONNECTION = None
Z3 XFRM CUR CONNECTION = Yd1
Z1
Z1 XFRM VOL CONNECTION = Dy11
Z1 XFRM CUR CONNECTION = None
Loop Current transformation
I I
AB
–
A B
I I
BC
–
B C
I I
CA
–
C A
3I
AB
A
3I
BC
B
3I
CA
C
I = 3I
AB
–
AB_21P
I = 3I
BC
–
BC_21P
I = 3I
CA
–
CA_21P
(b)
o
lag
Z3 XFRM VOL CONNECTION = Yd1
Z3 XFRM CUR CONNECTION = None
Z1 XFRM VOL CONNECTION = None
Z1 XFRM CUR CONNECTION = Dy11
(e)
o
lag
L
1
Zone 3
Z
L1
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
C
V = ----- - V
AB_21P
1
A
V = ----- - V
BC_21P
1
B
V = ----- - V
CA_21P
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 9: THEORY OF OPERATION
o
delta wye, 330 lag
Z3
Z1
L
2
Zone 1
Z Z
T L2
830717A1.CDR
)
)
)
( V )
–
BC CA
3
( V )
–
CA AB
3
( V )
–
AB BC
3