P74x/EN PL/N
1, P742, P743
(PL) 7-
Relay
English Text Type Source Description
Local overcurrent phase C Trip confirmation for
87BB or 50BF (CU) trip order
1st Stage Earth Fault Start
Blocking of the 2
nd
stage earth fault time delay
1st Stage Earth Fault Trip
Fast external neutral fault criterion to block the
connected zone enabled
2nd Stage Earth Fault Start
Blocking of the 2
nd
stage earth fault time delay
2nd Stage Earth Fault Trip
Local overcurrent earth to block the 87BB on
external fault
Local overcurrent Trip confirmation for the
neutral
Logic input to block the 87BB trip when the fault
is detected by the earth fault element
Logic input to block the 87BB trip when the fault
is detected by the fault element
Can be created automatically by the PSL
Can be created automatically by the PSL
Retrip triphase due to a 87BB trip initiation (at
tBF1)
Triphase Trip (87BB, 50BF(CU), I>, IN> or
manual zone trip (CU)).
Trip command directly applied to relay 1, 2, 3
Assignment of signal to drive LED 1 Red.
Assignment of signal to drive LED 8 Red.
Circuit Breaker Failed to Close
(after a manual/operator close command)
Circuit Breaker Failed to Trip
(after a manual/operator trip command)
Circuit Breaker closing order (CB Control)
Circuit Breaker tripping order (CB Control)
Manual/operator Circuit Breaker trip command
Manual/operator Isolator 1 (switch) closing
command
Manual/operator Isolator 6 (switch) closing
command
Manual Trip Order of a zone, general
information common to all PUs, the PU can be
connected to an healthy zone
Maximum flux reached in the phase A CT
Maximum flux reached in the phase B CT
Maximum flux reached in the phase C CT
Offset current read by the Analog board Phase
A, B, C or N
To switch the PU in overhaul mode
Variation error phase A (derived current)
Variation error phase B (derived current)
Variation error phase C (derived current)
Virtual Signal 01 from the PU to the CU via the
fibre optic
Virtual Signal 16 from the PU to the CU via the
fibre optic
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