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Section 11
Testing functionality by secondary injection
11.5.11.3
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.5.12
Pole discordance protection CCPDSC
Prepare the IED for verification of settings as outlined in section
section
11.5.12.1
Verifying the settings
1.
External detection logic, Contact function selection = ContSel setting equals CCPDSC signal
from CB. Activate the EXTPDIND binary input, and measure the operating time of CCPDSC.
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
CCPDSC protection.
Use the TRIP signal from the configured binary output to stop the timer.
12.
Deactivate the CLOSECMD: Set measured current in one phase to 90% of Current Release
level. Activate CLOSECMD.
NO TRIP signal should appear.
13.
Repeat the previous two steps using OPENCMD instead of CLOSECMD. Asymmetry current
detection with CB monitoring: Set all three currents to 110% of Current Release level. Activate
CLOSECMD.
NO TRIP signal should appear due to symmetrical condition.
14.
Deactivate the CLOSECMD. Decrease one current with 120% of the current unsymmetrical
level compared to the other two phases. Activate CLOSECMD and measure the operating time
of the CCPDSC protection.
Use the TRIP signal from the configured binary output to stop the timer.
15.
Deactivate the CLOSECMD. Decrease one current with 80% of the current unsymmetrical level
compared to the other two phases. Activate CLOSECMD.
NO TRIP signal should appear.
11.5.12.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
178
"Preparing for test"
in this chapter.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 504 165-UEN Rev. K
"Requirements"
and
Transformer protection RET670
Commissioning manual
M14922-50 v4
SEMOD55625-59 v6
SEMOD55625-63 v8
SEMOD55625-106 v4
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