7. Check the inverse time delay by injecting a voltage corresponding to 1.2 × U1>.8. Repeat the test to check the inverse time characteristic at different over-voltage levels.9. Repeat the above-described steps for Step 2 of the function.12.6.2.2 Extended testing GUID-BE4B4A36-CCEE-4020-B7DC-6A83A43D11F5 v21. The tests above can be repeated for2 out of 3 and for3 out of 3 operation mode.12.6.2.3 Completing the test M13806-43 v6Continue to test another function or end the test by changing theTestMode setting toOff.Restore connections and settings to their original values, if they were changed for testingpurposes.12.6.3 Two step residual overvoltage protection ROV2PTOV SEMOD54358-3 v6Prepare the IED for verification of settings as outlined in section "Requirements" andsection "Preparing for test" in this chapter.12.6.3.1 Verifying the settings SEMOD54358-35 v101. Apply a single-phase voltage either to a single-phase voltage input or to a residualvoltage input with the start value below the set valueU1>.2. Slowly increase the value until ST1 appears.3. Note the operate value and compare it with the set value.4. Decrease the voltage slowly and note the reset value.5. Set and apply a 20% higher voltage than the measured operate value for one phase.6. Measure the time delay for the TR1 signal and compare it with the set value.7. Check the inverse time delay by injecting a voltage corresponding to 1.2 × U1>.For example, if the inverse time curve A is selected, the trip signals TR1and TRIP operate after a time corresponding to the equation:t s kUU( ) => − 11 1IECEQUATION2429 V1 EN-US (Equation 99)where:t(s) Operate time in secondsk1 Settable time multiplier of the function for step 1U Measured voltageU1> Set start voltage for step 18. Repeat the test for Step 2 of the function.1MRK 502 067-UEN B Section 12Testing functionality by secondary injection185Commissioning manual
