ABB Relion Technical Manual page 153

1MRK 502 048-UUS A
Technical manual
BLKUNRES
a
IdUnre
b
IDMAG_A
IBIAS
BLOCK
BLKRES
Cross Block
from B or C
OpCrossBlock=Yes
ANSI07000020 V3 EN
Figure 57: Generator differential logic diagram 1.
Internal/
Neg.Seq. Diff
External
Current
Fault
discrimin
Contributions
ator
OpNegSeqDiff=On
IBIAS
a
b>a
b
Constant
BLKNSSEN
BLKNSUNR
BLOCK
PU_A
PU_B
PU_C
ANSI07000021 V2 EN
Figure 58: Generator differential logic diagram 2.
b>a
AND
OR
2nd and
5th
Harmonic
AND
AND
OR
Section 6
Differential protection
TRIPUNRE_A
AND
TRIPRES_A
AND
NOT
Cross Block
To B or C
AND
ANSI07000020-3-en.vsd
INTFAULT
TRNSSENS
AND
en07000021_ansi.vsd
PU_A
147