12.5.8.8 Verifying the function mode
Current&Contact
To be made only when FunctionMode = Current&Contact is selected. It is suggested
to make the tests in one phase only, or at three-phase trip applications for just three-
phase tripping.
Checking the case with fault current above set value
IP>
The operation shall be as in FunctionMode = Current.
1. Set FunctionMode = Current&Contact.
2. Leave the inputs for CB close inactivated. These signals should not influence.
3. Apply the fault condition, including the start of CCRBRF, with the current above
the set IP> value.
4. Check that the re-trip, if selected, and back-up trip commands are achieved.
Checking the case with fault current below set value
I>BlkCont
The case shall simulate a case where the fault current is very low and operation will
depend on CB position signal from CB auxiliary contact. It is suggested that re-trip
without current check is used, setting RetripMode = No CBPos Check.
1. Set FunctionMode = Current&Contact.
2. Apply input signal for CB closed to the relevant input or inputs CBCLDL1 (2 or
3).
3. Apply the fault condition with input signal(s) for start of CCRBRF. The value of
current should be below the set value I>BlkCont.
4. Verify that phase selection re-trip (if selected) and back-up trip are achieved
after set times. Failure to trip is simulated by keeping the signal(s) CB closed
activated.
5. Disconnect the input signal 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”.
12.5.8.9 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off. Restore connections and settings to their original values, if they were changed for
testing purposes.
12.5.9 Pole discordance protection CCPDSC
Prepare the IED for verification of settings outlined in section
"Requirements" and
section "Preparing for test" in this chapter.
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
164 Generator protection REG670 2.0 IEC
Commissioning manual
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