ABB REG670 - Page 624

SealIn = On
All UL < USealIn<
Any UL < UsealIn<
t
5 s
AND
3
P H
MCBOP
All UL > UsealIn<
t
60 s
CBCLOSED
BLOCK
AND
TEST
TEST ACTIVE
AND
BlocFuse = Yes
OpMode
AND
t
200 ms
AND
OR
DISCPOS
BLKU
BLKZ
AND
AND
FuseFailDetZeroSeq
UZsIZs OR UNsINs
UZsIZs AND UNsINs
UZsIZs
UNsINs
OptimZsNs
AND
FuseFailDetNegSeq
OR
AND
AND
CurrZeroSeq
CurrNegSeq
a
b
a>b
OR
AND
AND
AND
FuseFailDetDUDI
AND
OpDUDI = On
DeadLineDet1Ph
OR
OR
OR
OR
AND
VoltZeroSeq
VoltNegSeq
t
5 s
AllCurrLow
t
150 ms
intBlock
Fuse failure detection
Main logic
BLKTRIP
AND
t
100 ms
OR
t
20 ms
OR
IEC10000033-2-en.vsd
OR
FusefailStarted
IEC10000033 V2 EN
Figure 293: Simplified logic diagram for fuse failure supervision function, Main
logic
Section 13 1MRK502052-UEN B
Secondary system supervision
618
Technical manual