x/EN PL/Na7
7-
MiCOM P74
Relay
English Text Type Source Description
Fault in the dead zone on a phase
Fault in the dead zone on the neutral
Valid Setting configuration
All the protections (CU & PU) disabled
External or internal Breaker failure trip order
request (50BF) Logical OR of DDB 122, 172
Logic input to block the 87BB trip when the fault
is detected by the fault element
Logic input to block the 87BB trip when the fault
is detected by the earth fault element
Logical OR of ddb 121 and 270
Manual Trip Order of the Circuit Breaker
Manual closing order of the Circuit Breaker
PU in 50BF blocked mode Alarm
To switch the PU in 50BF blocked mode
To switch the PU in overhaul mode
Overcurrent Local trip confirmation
Fast external phase fault criterion to block the
connected zone enabled
Fast external neutral fault criterion to block the
connected zone enabled
Change on topology or configuration
Isolator 1 closed (not (Q1 Aux. (89b) AND Q1
Aux. (89a)))
Isolator 1 discrepancy (Q1 Aux. (89b) = Q1
Aux. (89a) for too long
Isolator 6 closed (not (Q6 Aux. (89b) AND Q6
Aux. (89a)))
Isolator 6 discrepancy (Q6 Aux. (89b) = Q6
Aux. (89a) for too long
Circuit Breaker closed (not (CB Aux. (52b) AND
CB Aux. (52a)))
Isolator 1 status position forced open (by
default) or closed
Isolator 6 status position forced open (by
default) or closed
CB status position forced open (by default) or
closed
When the forced positions of the CB and the
Isolators are used (during commissioning test)
ddb 123 or Logical OR of ddb 125 and 127 and
129
ddb 124 or Logical AND of ddb 126 and 128
and 130
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