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ABB RET650 Technical Manual page 259

Relion 650 series transformer protection

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1MRK 504 135-UEN A

Technical manual

Fuse failure detection

Main logic

TEST

TEST ACTIVE

AND

BlocFuse = Yes

BLOCK

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 sec

t

All UL > UsealIn<

VoltZeroSeq

OR

VoltNegSeq

AllCurrLow

CBCLOSED

DISCPOS

IEC10000041 V1 EN

Figure 114:

Simplified logic diagram for fuse failure supervision function, Main

logic

Secondary system supervision

OR

OR

AND

AND

5 s

OR

t

OR

OR

AND

AND

200 ms

AND

t

150 ms

t

OR

AND

5 sec

t

Section 11

intBlock

AND

AND

AND

OR

AND

OR

IEC10000041-1-en.vsd

BLKZ

BLKU

253

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