x/EN PL/Na7
7-
MiCOM P74
1.7 Description of P741 logic nodes
1.7.1 Sorted by DDB number:
Relay
English Text Type Source Description
Signal
Setting Group Selector X1 (low bit)
SG1 is active DDB 104=0 & DDB 105=0
SG2 is active DDB 104=1 & DDB 105=0
Signal
Setting Group Selector 1X (high bit)
SG3 is active DDB 104=0 & DDB 105=1
SG4 is active DDB 104=1 & DDB 105=1
To Reset the Circuitry Fault
Starting Disturbance Recorder
To Block 87BB phase & Earth algorithms
Signal
Reset all indications (Led and relays latched in
PSL)
that includes the Led Alarm
To disable all the protections (CU & PU)
Virtual Signal 01 from the CU to all the PUs via
the fibre optic
Virtual Signal 16 from the CU to all the PUs via
the fibre optic
Communication error to at least 1 PU
Signal
Triggers User Alarm 1 message to be alarmed
on LCD display (self-resetting)
Signal
Triggers User Alarm 8 message to be alarmed
on LCD display (self-resetting)
PU error blocking of zone 8
PU error blocking of zone 1
Circuitry fault blocking of zone 8
Circuitry fault blocking of zone 1
Circuitry fault alarm in zone 8
Circuitry fault alarm in zone 1
Differential fault current in zone 8
Differential fault current in zone 1
Breaker failure trip (50BF) of zone 8
Breaker failure trip (50BF) of zone 1
PSL (87BB SEF
Busbar Protection)
87BB SEF protection algorithm blocking of zone
8 opto input
PSL (87BB SEF
Busbar Protection)
87BB SEF protection algorithm blocking of zone
1 opto input
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