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Section 6
Testing functionality
6.4.9.1
6.4.9.2
6.4.9.3
76
To verify the settings in the most common back-up trip mode 1 out of 3, it is sufficient
to test phase-to-ground faults.
At mode 2 out of 4 the phase current setting, Pickup_PH can be checked by single-
phase injection where the return current is connected to the summated current input.
The value of residual (ground fault) current IN set lower than Pickup_PH is easiest
checked in back-up trip mode 1 out of 4.
Checking the phase current operate value,
Check the current level IP> where setting FunctionMode=Current and setting
BuTripMode=1 out of 3 or 2 out of 4 as set under Main menu/Settings/IED Settings/
Current/CCRBRF(50BF)/1:CCRBRF.
1.
Apply the fault condition, including INITIATION of CCRBRF (50BF), with a
current below set Pickup_PH.
2.
Repeat the fault condition and increase the current in steps until a trip occurs.
3.
Compare the result with the set Pickup_PH.
4.
Disconnect AC and INITIATE input signals.
Note! If NoIPickupcheck or Retrip off is set, only back-up trip can
be used to check set Pickup_PH.
Checking the residual (ground fault) current operate value
Pickup_PH
below
Check the low set Pickup_N current where setting FunctionMode = Current and setting
BuTripMode = 1 out of 4 as set under Main menu/Settings/IED Settings/Current/
CCRBRF(50BF)/1:CCRBRF.
1.
Apply the fault condition, including INITIATION of CCRBRF (50BF), with a
current just below set IN>Pickup_N.
2.
Repeat the fault condition and increase the current in steps until trip appears.
3.
Compare the result with the set Pickup_N.
4.
Disconnect AC and INITIATION input signals.
Checking the re-trip and back-up times
The check of the set times can be made in connection with the check of operate values
above.
1MRK 506 331-UUS A
Pickup_PH
Pickup_N set
Commissioning Manual
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