9.9.3.2 Completing the test M11758-57 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.9.9.4 Scheme communication logic for residual overcurrentprotection ECPSCH M13926-2 v6Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".Before testing the communication logic for residual overcurrent protection functionECPSCH, the four step residual overcurrent protection function EF4PTOC has tobe tested according to the corresponding instruction. Once this is done, continuewith the instructions below.If the current reversal and weak-end infeed logic for earth-fault protection isincluded, proceed with the testing according to the corresponding instruction aftertesting the communication logic for residual overcurrent protection. The currentreversal and weak-end-infeed functions shall be tested together with the permissivescheme.9.9.4.1 Testing the directional comparison logic function M13926-7 v2Blocking scheme M13926-9 v61. Inject the polarizing voltage at 5% of UBase (EF4PTOC) where the current islagging the voltage by 65°.2. Inject current (65° lagging the voltage) in one phase at about 110% of the setoperating current, and switch the current off with the switch.3. Switch the fault current on and measure the operating time of thecommunication logic.Use the TRIP signal from the configured binary output to stop the timer.4. Compare the measured time with the set value tCoord.5. Activate the CR binary input.6. Check that the CRL output is activated when the CR input is activated.7. Switch the fault current on (110% of the set operating current) and waitlonger than the set value tCoord.No TRIP signal should appear.8. Switch the fault current off.9. Reset the CR binary input.10. Activate the BLOCK digital input.1MRK 506 383-UEN A Section 9Testing functionality by secondary injectionLine distance protection REL650 2.2 IEC 153Commissioning manual
