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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