4. Apply two-phase currents with their rated value and zero voltages.5. Decrease the measured current in both phases until the DLD2PH signalappears.6. This is the point at which the dead line condition is detected. Check the valueof the decreased current with the set value IDLD< (IDLD< is in percent ofthe base current IBase).10.8.2.3 Checking the operation of the du/dt and di/dt based functionGUID-102B7334-0E33-45AE-A353-869ED527770A v2Check the operation of the du/dt and di/dt based function if included in the IED.1. Simulate normal operating conditions with the two-phase currents in phasewith their corresponding phase voltages and with all of them equal to theirrated values.2. Change the voltages and currents in all phases simultaneously.The voltage change must be higher than the set value DU> and the currentchange must be lower than the set value DI<.The BLKU and BLKZ signals appear without any time delay.3. Apply normal conditions as in step 1The BLKU and BLKZ signals should reset, if activated, see step 1 and 2.4. Change the voltages and currents in all phases simultaneously.The voltage change must be higher than the set value DU> and the currentchange must be higher than the set value DI<.The BLKU and BLKZ signals should not appear.5. Repeat step 2.6. Connect the rated voltages in all phases and feed a current below the operatelevel in all phases.7. Keep the current constant. Disconnect the voltage in both two phasessimultaneously.The BLKU and BLKZ signals should not appear.10.8.2.4 Completing the test GUID-E265B56C-4064-40DD-A39C-26CBE54F6227 v1Continue to test another function or end the test by changing the TestMode settingto Off. Restore connections and settings to their original values, if they werechanged for testing purposes.10.8.3 Voltage based delta supervision DELVSPVCGUID-FBFEC9C5-1B76-4688-A00D-9EEB33326966 v1Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".10.8.3.1 Verifying the signals and settings GUID-B05EE7E5-2360-4036-991A-00747C47A625 v2Make sure that the function is connected to SMAI function with U2P signal.Section 10 1MRK 506 377-UEN CTesting functionality by secondary injection126 Railway application RER670 2.2 IECCommissioning manual
