6. Apply the fault and the initiate again. The value of current should be below the set
value Pickup_BlkCont.
7. Arrange disconnection of BC closed signal(s) well before set back-up trip time t2. It
simulates a correct CB tripping.
8. Verify that back-up trip is not achieved. Re-trip can appear for example, due to
selection "Re-trip without current check".
9. Disconnect injected AC and initiation of input signals.
6.3.10.8 Checking the phase current operate value,
Pickup_PH
Check the low set Pickup_PH current 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/CSPRBRF(50BF)/CSPRBRF:1.
1. Apply the fault condition, including pickup of CSPRBRP (50BF), with a current just
below set Pickup_PH.
2. Repeat the fault condition and increase the current in steps until trip appears.
3. Compare the result with the set Pickup_PH.
4. Disconnect AC and pickup input signals.
If NoIPickupcheck or Retrip off is set, only back-up trip can be used to
check set Pickup_PH.
6.3.10.9 Completing the test
Continue to test another function or end the testing by setting the parameter TestMode to
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is
tested, then set the parameter Blocked to No under Main menu/Tests/Function test
modes/Current/CSPRBRF(50BF)/CSPRBRF:1 for the function, or for each individual
function in a chain, to be tested next. Remember to set the parameter Blocked to Yes, for
each individual function that has been tested.
6.3.11 Stub protection STBPTOC (50STB)
Prepare the IED for verification of settings as outlined in
5.1 "Preparing the IED to verify
settings".
Logical signals for STBPTOC (50STB) protection are available on the local HMI
underMain menu/Tests/Function status/Current/STBPTOC(50STB)/STBPTOC:1/
Inputs or Outputs
Section 6 1MRK 505 293-UUS A
Testing functionality
68
Commissioning manual
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