ABB RET650 Technical Manual page 113
Relion 650 series
transformer protection
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Also See for RET650:
- Applications manual (392 pages) ,
- Commissioning manual (112 pages) ,
- Product manual (70 pages)
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1MRK 504 135-UEN A
Technical manual
BLKUNRES
a
IdUnre
b
IDL1MAG
IBIAS
BLOCK
BLKRES
IDL1
2nd
Harmonic
Wave
block
5th
Harmonic
Cross Block
from L2 or L3
OpCrossBlock=On
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
b>a
AND
OR
AND
Section 6
Differential protection
TRIPUNREL1
AND
TRIPRESL1
AND
1
Cross Block
to L2 or L3
AND
OR
en06000545.vsd
STL1
BLK2HL1
BLKWAVL1
BLK5HL1
107
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