07 SEP-602A_Fuse Failure

7/31/2019 07 SEP-602A_Fuse Failure

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2007-10-03 Substation Automation and Protection Training

REL 670 Line DistanceProtection IED

Fuse failure

Substation Automation andProtection Training

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AB,

2007


FUSE FAILURE the problem


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FUSE FAILURE the idea

Fuse failure function detects the loss of signal from VTs.

This information is used to block distance protection function and any other voltagerelated function.

ZM01ZM02ZM03ZM04ZM05

To Block Voltagerelated functions

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FSD the algorithms

Detection of Fuse Failure:

high value of zero sequence voltage (3Uo>)

absence of zero sequence current (3Io)absence of negative sequence current (3I2


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ABBAB,

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FSD the algorithms

INFORMATION FROM BUILT-INDEAD PHASE DETECTION

U> and I> check:

The line had normal operating conditions for at least 200 msbefore the fuse failure was activated

Dead phase detection prevents activation of fuse failure duringsingle pole A/R (when temporary unbalance in the primarysystem could cause unwanted activation of fuse failure signal)

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ABB

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Detection of Fuse (MCB) Failure:

Auxiliary contact from the MCB connected to a

binary input of the terminal

MCB trips generally three phase (3-phase fuse failure)

All the three voltages are missing atthe same time

It is impossible to detect

a negative sequence voltageor a zero sequence voltage.

FSD the algorithms


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FSD Presence of line Disconnector


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In this situation FUSE should also operate:

Delta U and Delta I algorithm:

The delta current and delta voltagealgorithm, detects a fuse failure if asufficient negative change in voltageamplitude without a sufficient change incurrent amplitude is detected.

This algorithm only operates if the circuitbreaker is closed.

I/t

U/t

FSD Busbar switching (or 3-phase fuse failure)

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FSD (RFUF) Settings

What happens in case of real fuse failure?3Io or 3I2 is more or less very small, so which algorithm will be choosen?

Actually it does not matter which one will be chosen because they bothwork well in case of real fuse failure. This algorithm has been done toincrease the security during network unbalances (single phase opening,faults etc.).


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FSD Settings

Settings for >> and


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FSD Settings

Settings for Dead Phase detection

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FSD Settings

Settings for Locking (seal-in) FUSE FAILUREdetection in the non-volatile memoryand for its automatic reset at line energization(see next page for state diagram)


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FSD (RFUF) - State diagram

Normal

Load

Condition

0,0,0

Block

U functions

0,1,0

Block

U, Z functions

0,1,1

Fusefailuredetected

AND

DEADPHASE

FuseFailuredetecte

dmore

than5s

ANDSEALIN=ON

FuseFailureDetected

FuseFa

ilure

moretha

n5s

AND

SEALIN=O

N

Block U, Z functions

1,1,1

Linede-energized

STORE

non-volatile memory

NoFuseFailure

detected

NoFuse

Failurede

tected

(Fuserep

aired)

Switch-on

andSwitch-off

theterminal

Lineenergized

FUSE

Lineen

ergized

ANDn

oFuse

Failure

Detect

ed

(fusere

paired

)

0,1,1

Block

U, Z functions

Internal Latch

x,y,z = output status = FSD1-3PH, FSD1-BLKU, FSD1-BLKZ

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Normal

Load

Condition

0,0,0

DISC(opendisconn

ector)

MCBTrip

Disconnector close

d

Block

U functions

by disconnector0,1,0

Block

U, Z functions

by MCB trip

0,1,1

MCBrepaired




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Normal

Load

Condition

0,0,0

Block

U functions

0,1,0

Block

U, Z functions

0,1,1

FUSE+DEADPHASE FUSEmorethan5

s

FUSE

FUSE

more

than

5s

Block U, Z functions

1,1,1

Linede-energized

STORE

non-volatile memory

NoFUSE

NoFUSE

(Fuserep

aired)

Switch-on

andSwitch-off

theterminal

Lineenergized

FUSE

Lineenergiz

ed

noFUS

E(fuse

repaired)

0,1,1

Block

U, Z functions

InternalLatch

Block

U functions

by disconnector

0,1,0

Block

U, Z functions

by MCB trip

0,1,1

DISCo

pen

DISC

closed

MC

BTr i

p

MC B

r e

p a i r

e d


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FSD (RFUF) Configuration


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07 SEP-602A_Fuse Failure