ABB RELION 620 Series Technical Manual page 630

Section 6
Supervision functions
6.7.5
624
PickUpNoTripC in the monitored data is set to "True". Once the fault is detected in
phase B or phase C, the corresponding fault count SCB or SCC is incremented.
If the AdapPhPu setting is set to "True", the threshold setting value PhPu is adaptively
calculated for each phase separately. The adaptive threshold value set equal to the average
of the phase current over the 2
rd
Until the 3 cycle, the set value PhPu is used for detecting the self-clearing fault. After the
rd
3 cycle, the adaptively calculated threshold value for each phase is used for detecting the
self-clearing fault.
This adaptive threshold implementation for each phase is considered only if the average
of the phase current over the 2
Otherwise, the set value PhPu is considered for the corresponding phase fault detection.
SCFD decision
If the self-clearing fault is detected in at least one phase, the PICKUP and TRIP outputs
are set to "True". Also SCDetect in the monitored data is set to "True".
When one phase detects a fault, the algorithm waits for one cycle time and during this
period if the other two phases have detected a fault, the event is considered a three-phase
event and the Event3Ph in the monitored data is set to "True".
Activation of the BLOCK input deactivates all the binary outputs.
Signals
Table 449: CFD Input signals
Name Type
I_A SIGNAL
I_B SIGNAL
I_C SIGNAL
BLOCK BOOLEAN
Table 450: CFD Output signals
Name Type
TRIP BOOLEAN
PICKUP BOOLEAN
nd rd
and 3 cycle after the AdapPhPu setting is set to "True".
nd rd
and 3 cycle is greater than setting AbsMinLoad.
Default Description
0 Phase A current
0 Phase B current
0 Phase C current
0=False Block overall functions
Description
Trip
Pickup
1MAC504801-IB E
620 series ANSI
Technical Manual