9.4.4 Four step residual overcurrent protection, (Zero sequenceor negative sequence directionality) EF4PTOC SEMOD53296-3 v9Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".Values of the logical signals for D2PTOC are available on the local HMI underMain menu/Tests/Function status/Current protection/ResidualOverCurr4Step(51N_67N,4(IN>))/EF4PTOC(51N_67N;4(IN>)):x,where x = instance number.The Signal Monitoring in PCM600 shows the same signals that are available on thelocal HMI.9.4.4.1 Four step directional earth fault protection SEMOD53296-208 v71. Connect the test set for single current injection to the appropriate IEDterminals.Connect the injection current to terminals L1 and neutral.2. Set the injected polarizing voltage slightly larger than the set minimumpolarizing voltage (5% of Ur) and set the injection current to lag the voltageby an angle equal to the set reference characteristic angle (AngleRCA), if theforward directional function is selected.If reverse directional function is selected, set the injection current to lag thepolarizing voltage by an angle equal to RCA+ 180°.3. Increase the injected current and note the value at which the studied step ofthe function operates.4. Decrease the current slowly and note the reset value.5. If the test has been performed by injection of current in phase L1, repeat thetest, injecting current into terminals L2 and L3 with a polarizing voltageconnected to terminals L2, respectively L3.6. Block lower set steps when testing higher set steps according to theinstructions that follow.7. Connect a trip output contact to a timer.8. Set the injected current to 200% of the operate level of the tested step, switchon the current and check the time delay.For inverse time curves, check the operate time at a current equal to 110% ofthe operate current for txMin.9. Check that all operate and start contacts operate according to theconfiguration (signal matrixes)10. Reverse the direction of the injected current and check that the step does notoperate.11. Check that the protection does not operate when the polarizing voltage iszero.12. Repeat the above described tests for the higher set steps.13. Finally, check that start and trip information is stored in the event menu.Section 9 1MRK 506 383-UEN ATesting functionality by secondary injection106 Line distance protection REL650 2.2 IECCommissioning manual
