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-US
Figure 43: Transformer differential protection simplified logic diagram for external/internal
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-US
Figure 44: Transformer differential protection internal grouping of tripping signals
1MRK 502 066-UUS B
Section 6
Differential protection
141
Technical manual
Summary of Contents for Relion 670 series
Page 1: ... RELION 670 SERIES Generator protection REG670 Version 2 1 ANSI Technical manual ...
Page 2: ......
Page 48: ...42 ...
Page 62: ...56 ...
Page 182: ...176 ...
Page 692: ...686 ...
Page 726: ...720 ...
Page 1014: ...1008 ...
Page 1242: ...1236 ...
Page 1362: ...1356 ...
Page 1386: ...1380 ...
Page 1422: ...1416 ...
Page 1431: ...1425 ...