13.5.8.1 Checking the phase current trip value,
Pickup_PH
M12104-23 v13
The check of the Pickup_PH current level is best made in FunctionMode = Current
and BuTripMode = 1 out of 3 or 2 out of 4.
1. Apply the fault condition, including BFI_3P 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 BFI_3P input signals.
If No CBPos Check or Retrip off is set, only back-up trip can be used to
check set IP>.
13.5.8.2 Checking the residual (ground fault) current trip value
Pickup_N
set
below
Pickup_PH
M12104-80 v9
Check the low set Pickup_N current where setting FunctionMode = Current and setting
BuTripMode = 1 out of 4
1. Apply the fault condition, including BFI_3P of CCRBRF (50BF), with a current
just below set 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 BFI_3P input signals.
13.5.8.3 Checking the re-trip and back-up times
M12104-93 v11
The check of the set times can be made in connection with the check of trip values
above.
Choose the applicable function and trip mode, such as FunctionMode = Current and
RetripMode = CB Pos Check .
1. Apply the fault condition, including initiation of CCRBRF (50BF), well above
the set current value. Measure time from BFI_3P of CCRBRF (50BF).
2. Check the re-trip t1 and back-up trip times t2 and t3.
In applicable cases, the back-up trip for multi-phase pickupt2MPh and back-up
trip 2, t2 and t3 can also be checked. To check t2MPh, a two-phase or three-phase
initiation shall be applied.
3. Disconnect AC and BFI_3P input signals.
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
202 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
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