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.
15.6.8.9 Completing the test
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
15.6.9 Pole discordance protection CCRPLD
Prepare the IED for verification of settings outlined in section "Overview" and
section "Preparing for test" in this chapter.
15.6.9.1 Verifying the settings
1. External detection logic, Contact function selection = ContSel setting equals
CCRPLD signal from CB. Activate the EXTPDIND binary input, and
measure the operating time of CCRPLD.
Use the TRIP signal from the configured binary output to stop the timer.
2. Compare the measured time with the set value tTrip.
3. Reset the EXTPDIND input.
4. Activate the BLKDBYAR binary input.
This test should be performed together with Autorecloser SMBRREC.
5. Activate the EXTPDIND binary input.
No TRIP signal should appear.
6. Reset both BLKDBYAR and EXTPDIND binary inputs.
7. Activate the BLOCK binary input.
8. Activate EXTPDIND binary input.
NO TRIP signal should appear.
9. Reset both BLOCK and EXTPDIND binary inputs.
10. If Internal detection logic Contact function selection = ContSel setting equals
Pole position from auxiliary contacts. Then set inputs
POLE1OPN...POLE3CL in a status that activates the pole discordance logic
and repeats step 2 to step
6.
11. Unsymmetrical current detection with CB monitoring: Set measured current
in one phase to 110% of current release level. Activate CLOSECMD and
measure the operating time of the CCRPLD protection.
Use the TRIP signal from the configured binary out put stop the timer.
12. 12. Deactivate the CLOSECMD: Set measured current in one phase to 90%
of Current Release level. Activate CLOSECMD.
NO TRIP signal should appear.
1MRK 502 029-UEN A Section 15
Verifying settings by secondary injection
185
Installation and commissioning manual
To Next Page
Loading...
