Internal/
External
Fault
discrimin
ator
t
PU_A
PU_B
PU_C
OR
AND
EXTFAULT
INTFAULT
TRNSSENS
TRNSUNR
en05000167_ansi.vsd
Constant
IBIAS
a
b
b>a
Neg.Seq. Diff
Current
Contributions
OpNegSeqDiff=On
AND
BLKNSSEN
BLKNSUNR
BLOCK
0
ANSI05000167 V1 EN
Figure 39:
Transformer differential protection simplified logic diagram for internal/
external fault discriminator
en05000278_ansi.vsd
TRIPRES_A
TRIPRES_B
TRIPRES_C
OR
TRIPRES
TRIPUNRE_A
TRIPUNRE_B
TRIPUNRE_C
OR
TRIPUNRE
OR
TRIP
TRNSUNR
TRNSSENS
ANSI05000278 V1 EN
Figure 40:
Transformer differential protection internal grouping of tripping signals
1MRK 502 048-UUS A
Section 6
Differential protection
115
Technical manual
Содержание 650 series
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