GE D90 Plus - Page 653

CHAPTER 15: THEORY OF OPERATION PHASE DISTANCE APPLIED TO POWER TRANSFORMERS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 643
Figure 554: Applications of the phase distance transformer settings
NOTE
NOTE:
In the following tables, the suffix “_21P” indicates current or voltage inputs to the phase
distance (ANSI 21P) element.
Table 24: Phase distance input signals for delta-wye transformers
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Transformer
connection
Loop Current transformation Voltage transformation
None AB
BC
CA
Dy1 AB
BC
CA
Dy3 AB
BC
CA
BAAB
III -=_21P
ABAB
VV =_21P
BAAB
III -=_21P
BCBC
VV =_21P
ACCA
III -=_21P
CACA
VV =_21P
AA
II 3_21P =
()
CAABAB
VVV -=
3
1
_21P
BB
II 3_21P =
()
ABBCBC
VVV -=
3
1
_21P
CC
II 3_21P =
()
BCCACA
VVV -=
3
1
_21P
CAB
II 3_21P -=
()
CA
BC
AB
VVV -=
3
1
_21P
ABC
II 3_21P -=
()
AB
CA
BC
VVV -=
3
1
_21P
BCA
II 3_21P -=
()
BC
AB
CA
VVV -=
3
1
_21P