IdUnre
IDL1MAG
2nd
Harmonic
5th
Harmonic
Wave
block
IDL1
AND
Cross Block
from L2 or L3
OpCrossBlock=On
OR
1
IBIAS
TRIPUNREL1
STL1
TRIPRESL1
BLK2HL1
BLKWAVL1
en06000545.vsd
a
b
b>a
OR
AND
Cross Block
to L2 or L3
AND
AND
AND
BLKUNRES
BLOCK
BLKRES
BLK5HL1
S
w
itc
h
o
n
to
f
au
lt
lo
gi
c
IEC06000545 V1 EN
Figure 39:
Transformer differential protection simplified logic diagram for Phase
L1
IEC05000167-TIFF V1 EN
Figure 40:
Transformer differential protection simplified logic diagram for
internal/external fault discriminator
1MRK 504 135-UEN A
Section 6
Differential protection
107
Technical manual
Summary of Contents for ret650
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