5.
Disconnect the AC and the START signal(s). Keep the CB closed signal(s).
6.
Apply the fault and the start again. The value of current should be below the
set value
I>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 START input signals.
6.4.6.8
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Off
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/CCRBRF(50BF)/X:CCRBRF
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.
6.4.7
Pole discordance protection CCRPLD
Prepare the IED for verification of settings as outlined in
Values of the logical signals for CCRPLD are available on the local HMI under
Main menu/Tests/Function status/Current/CCRPLD(52PD)/X:CCRPLD
. The
Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
6.4.7.1
Verifying the settings
1.
When CCRPLD is set for external, set setting
ContSel
to
On
under
Main
menu/Settings/IED Settings/Current/CCRPLD/1:CCRPLD
to activate the
logic that detects pole discordance when external pole discordance signaling
is used (input EXTPDIND) in the application configuration.
2.
Activate the input EXTPDIND on CCRPLD function block, and measure the
operating time of CCRPLD.
3.
Compare the measured time with the set value
tTrip
.
4.
Reset the EXTPDIND input.
5.
When CCRPLD is set for unsymmetrical current detection with CB
monitoring, set setting
CurrSel
under
Main menu/Settings/IED Settings/
Current/CCRPLD/1:CCRPLD
to
On
.
Use the TRIP signal from the configured binary output to stop the timer.
6.
Repeat point 4 and 5 using OPENCMD instead of CLOSECMD. Set all three
currents to 110% of
CurrRelLevel
. Activate CLOSECMD.
NO TRIP signal should appear due to symmetrical condition.
Section 6
1MRK 504 126-UEN -
Testing functionality
54
Commissioning Manual