Make sure that CS and TRIP output signals appear after the time delays tCS.3. Switch the operation of the zone 1 distance protection function on and fulfillall the conditions for single-pole autoreclosing.4. Simulate a single phase-to-earth fault within the reach of zone 1 and bothpower-swing zones.The fault should cause a single-pole tripping with the normal operating timeof zone 1.5. Repeat the fault within the dead time of single-pole autoreclosing.Make sure, that PSLPSCH generates a BLKZMUR signal and no CS andTRIP.11.4.10.3 Checking the underreaching zone M14946-49 v3Procedure1. Set the operation of all normal distance protection zones to On.2. Simulate a fault without fault resistance in the middle of distance protectionzone 1.Make sure that the trip appears within the operate time for the distanceprotection zone 1 and no BLKZMOR output signal appears.3. Switch off the fault and prepare a new fault without fault resistance within thenormal distance protection zone 2 operate area, but outside the zone 1 operatearea.4. Switch on the fault and move it into the zone 1 operate area with a time delaylonger than the time set on the tDZ timer and faster than the time set on timertZL.5. Observe the operate time, which must be equal to the operate time of zone 1,after the measured impedance enters its operate area.No delayed operation of zone 1 must be observed.6. Configure the STPSD functional input to connect to the START functionaloutput and repeat the previous fault.Fast trip, caused by the operation of zone 1 must appear with a time delay,which is equal to the set time delay on the timer tZL plus zone 1 normaloperate time. Also, observe the BLKZMOR functional output signal, whichmust appear for a short time.7. Be sure to establish the original configuration of the IED and the originalsettings of all setting parameters.11.4.10.4 Completing the test M14946-70 v2Continue to test another function or end the test by changing the TESTMODEsetting to Off. Restore connections and settings to their original values, if they werechanged for testing purposes.Section 11 1MRK 505 378-UEN ATesting functionality by secondary injection146 Line differential protection RED670 2.2 IECCommissioning manual
