4. Switch the current infeed injection off. The function shall reset. Turn the currenton with the values corresponding to Test #3 and measure the time to activationof signal TRZ2. This time shall be compared to tZ2.5. Feed the IED with current and voltage corresponding to the apparent impedance:Test #4, as shown in figure 12. Read the analog outputs for R and X and checkthat this reading corresponds to the injected impedance. The signals START,STZ2 and STZ1 shall be activated instantaneously and the signals TRIP, TRZ2and TRZ1 shall be activated after the different set time delays.6. Switch the current infeed injection off. The function shall reset. Turn the currenton with the values corresponding to Test #4 and measure the time to activationof signal TRZ1. This time shall be compared to tZ1.IEC06000513-2-en.vsdRXUnderexcitation ProtectionRestrain areaZ1, Fast zoneZ2, Slow zoneTest #1Test #2Test #3Test #4IEC06000513 V2 ENFigure 12: Testing current and voltage corresponding to the apparentimpedance6.4.3.2 Completing the testContinue to test another function or end the testing by setting the parameter TestModeto Off under Main menu/Tests/IED test mode/TESTMODE:1. If another functionis tested, then set the parameter Blocked to No under Main menu/Tests/Function testmodes/Impedance/LEXPDIS(40)/LEXPDIS:1 for the function, or for eachindividual function in a chain, to be tested next. Remember to set the parameterBlocked to Yes, for each individual function that has been tested.Section 6 1MRK 502 049-UEN ATesting functionality54Commissioning manual
