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ABB Relion 650 Series Technical Manual page 132

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Section 7

Secondary system supervision

126

Fuse failure detection

Main logic

TEST

TEST ACTIVE

AND

BlocFuse = Yes

BLOCK

BLKTRIP

20 ms

AND

t

All UL < USealIn<

SealIn = On

Any UL < UsealIn<

FuseFailDetDUDI

AND

OpDUDI = On

FuseFailDetZeroSeq

AND

AND

FuseFailDetNegSeq

AND

UNsINs

UZsIZs

UZsIZs OR UNsINs

OpMode

UZsIZs AND UNsINs

OptimZsNs

CurrZeroSeq

a

a>b

CurrNegSeq

b

DeadLineDet1Ph

MCBOP

60 s

t

All UL > UsealIn<

VoltZeroSeq

VoltNegSeq

OR

AllCurrLow

CBCLOSED

DISCPOS

IEC10000033 V2 EN-US

Figure 52:

Simplified logic diagram for fuse failure supervision function, Main

logic

OR

100 ms

t

FusefailStarted

OR

AND

AND

5 s

OR

t

OR

OR

AND

AND

200 ms

AND

t

150 ms

t

OR

AND

5 s

t

1MRK 511 424-UEN B

intBlock

AND

AND

AND

OR

AND

OR

IEC10000033-2-en.vsd

Bay control REC650 2.2 IEC

Technical manual

OR

BLKZ

BLKU

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