ABB Relion 670 series - Page 170

IdUnre
IDMAG_A
2nd and
5th
Harmonic
I D
_ A
AND
Cross Block
from B or C
OpCrossBlock=Yes
OR
NOT
IBIAS
TRIPUNRE_A
PU_A
TRIPRES_A
B
L K H
ANSI07000020-3-en.vsd
a
b
b>a
AND
AND
AND
AND
BLKUNRES
BLOCK
BLKRES
Cross Block
To B or C
ANSI07000020 V3 EN-US
Figure 58: Generator differential logic diagram 1
Internal/
External
Fault
discrimin
ator
PU_A
PU_B
PU_C
OR
AND
E
X
T
F
A U
L
T
INTFAULT
TRNSSENS
T R N S U N R
en07000021_ansi.vsd
Constant
IBIAS
a
b
b>a
Neg.Seq. Diff
Current
Contributions
OpNegSeqDiff=On
AND
BLKNSSEN
BLKNSUNR
BLOCK
ANSI07000021 V2 EN-US
Figure 59: Generator differential logic diagram 2
Section 6 1MRK 502 066-UUS B
Differential protection
164
Technical manual