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
.
Logical signals for STBPTOC (50STB) protection are available on the local HMI
under
Main menu/Tests/Function status/Current/STBPTOC(50STB)/STBPTOC:1/
Inputs or Outputs
Section 6
1MRK 505 293-UUS A
Testing functionality
68
Commissioning manual
