Table 88:
Fuse failure output control
Fuse failure detection criterion
Conditions and function response
Negative-sequence criterion
If a fuse is detected based on the negative-
sequence criterion, the
FUSEF_U
output is
activated.
The
FUSEF_U
output signal is also activated if all
the phase voltages are above the
Seal in Voltage
setting for more than 60 seconds and at the same
time the negative-sequence voltage is above
Neg
Seq Voltage Lev for more than 5 seconds, all the
phase currents are below the
Current Dead Lin Val
setting and the circuit breaker is closed, that is,
FF_CBCLOSED
is TRUE.
Current and voltage delta function criterion
If the current and voltage delta criterion detects a
fuse failure condition, but all the voltages are not
below the
Seal in Voltage setting, only the
FUSEF_U
output is activated.
External fuse failure detection
The
FF_DISCONOPEN
input signal is supposed to
be connected through a protection relay binary
input to the N.C. auxiliary contact of the line
disconnector. The
FF_DISCONOPEN
signal sets
the
FUSEF_U
output signal to block the voltage-
related functions when the line disconnector is in
the open state.
It is recommended to always set
Enable Seal
in to "True". This secures
that the blocked protection functions remain blocked until normal
voltage conditions are restored if the fuse failure has been active for 5
seconds, that is, the fuse failure outputs are deactivated when the
normal voltage conditions are restored.
Signals
Table 89:
SEQSPVC Input signals
Name
Type
Default
Description
IA
SIGNAL
0
Phase A current
IB
SIGNAL
0
Phase B current
IC
SIGNAL
0
Phase C current
I
2
SIGNAL
0
Negative-sequence
current
U_A
SIGNAL
0
Phase A voltage
U_B
SIGNAL
0
Phase B voltage
U_C
SIGNAL
0
Phase C voltage
U2
SIGNAL
0
Negative phase
sequence voltage
FF_CBCLOSED
BOOLEAN
0 = False
Active when circuit
breaker is closed
FF_DISCONOPEN
BOOLEAN
0 = False
Active when line
disconnector is open
Section 6
1MRS757488 H
Commissioning
142
RIO600
Installation and Commissioning Manual
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