1. Connect the test set for three-phase voltage injection (L1, L2, L3) or residual
voltage injection (N) to the appropriate IED terminals. This depends on how the
IED is fed from the VT.
2. Increase the injected zero sequence voltage and note the operated value (start
value) of the studied step of the function.
3. Decrease the voltage slowly and note the reset value.
4. Connect a trip output contact to a timer.
5. Set the injected voltage to 110% of the operate level in the tested stage, switch
on the current and check the time delay.
6. Check that all trip and start contacts operate according to the configuration
(signal matrices).
7. Finally check that start and trip information is stored in the event memory.
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.
10.11.7.7 Negative sequence overcurrent protection LCNSPTOC
Prepare the IED for verification of settings as outlined in section
"Requirements" and
section "Preparing for test" in this chapter.
I E D T E S T S E T
IL 1
IL 2
IL 3
IL 1
IL 2
IL 3
IED
IEC10000013-1-en.vsd
IEC10000013 V1 EN
Figure 46: Connection of test equipment to the IED
1MRK 506 355-UEN A Section 10
Testing functionality by secondary injection
Line distance protection REL670 2.1 IEC 227
Commissioning manual
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