ABB REG650 Technical Manual page 119

1MRK 502 034-UEN -
Technical Manual
BLKUNRES
IdUnre
IDL1MAG
IBIAS
BLOCK
BLKRES
INTFAULT
Cross Block
from L2 or L3
OpCrossBlock=On
IEC07000020 V2 EN
Figure 54: Generator differential logic diagram 1.
Internal/
Neg.Seq. Diff
External
Current
Fault
discrimin
Contributions
OpNegSeqDiff=On
IBIAS
a
b>a
b
Constant
BLKNSSEN
BLKNSUNR
BLOCK
STL1
STL2
STL3
IEC07000021 V2 EN
Figure 55: Generator differential logic diagram 2.
a
b>a
b
AND
OR
2nd and
5th
Harmonic
AND
ator
AND
OR
Section 5
Differential protection
TRIPUNREL1
AND
TRIPRESL1
AND
1
AND
en07000020.vsd
INTFAULT
TRNSSENS
AND
en07000021.vsd
STL1
113