10.4.4.1 Completing the test SEMOD53296-122 v4Continue 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.10.4.5 Thermal overload protection, two time constants TRPTTRSEMOD53632-3 v5Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".10.4.5.1 Checking operate and reset values SEMOD53632-11 v71. Connect symmetrical three-phase currents to the appropriate current terminalsof the IED.2. Set the Time constant 1 (Tau1) and Time Constant 2 (Tau2) temporarily to 1minute.3. Set the three-phase injection currents slightly lower than the set operate valueof stage IBase1, increase the current in phase L1 until stage IBase1operatesand note the operate value.Observe the maximum permitted overloading of the currentcircuits in the IED.4. Decrease the current slowly and note the reset value.Check, in the same way, the operate and reset values of IBase1 for phases L2and L3.5. Activate the cooling input signal, thus switching to base current IBase2.6. Check the operate and reset values (for all three phases) for IBase2 in thesame way as described above for stage IBase1.7. Deactivate the input signal for stage IBase2.8. Set the time constant for IBase1 in accordance with the setting plan.9. Set the injection current for phase L1 to 1.50 · IBase1.10. Connect a trip output contact to the timer and monitor the output of contactsALARM1 and ALARM2 to digital inputs in test equipment.Read the heat content in the thermal protection from the local HMI and waituntil the content is zero.11. Switch on the injection current and check that ALARM1 and ALARM2contacts operate at the set percentage level and that the operate time fortripping is in accordance with the set Time Constant 1 (Tau1).With setting Itr = 101%IBase1 and injection current 1.50 · IBase1, the triptime from zero content in the memory shall be 0.60 · Time Constant 1 (Tau1).12. Check that all trip and alarm contacts operate according to the configurationlogic.1MRK 505 372-UEN A Section 10Testing functionality by secondary injectionBusbar protection REB670 2.2 IEC 95Commissioning manual
