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.
6.4.10.8
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)/1:CSPRBRF
.
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
.
6.4.10.9
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/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Current/CSPRBRF(50BF)/1:CSPRBRF
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.
6.4.11
Stub protection STBPTOC (50STB)
Prepare the IED for verification of settings as outlined in
Logical signals for STBPTOC (50STB) protection are available on the local HMI
under
Main menu/Tests/Function status/Current/STBPTOC(50STB)/1:STBPTOC/
Inputs or Outputs
Section 6
1MRK 506 331-UUS A
Testing functionality
84
Commissioning Manual
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