11.11.4 Local acceleration logic ZCLCPSCH M11758-32 v5Prepare the IED for verification of settings outlined in Section "Preparing the IEDto verify settings".The logic is checked during the secondary injection test of the impedancemeasuring zones.11.11.4.1 Verifying the settings M11758-37 v41. Provide the IED with conditions equivalent to normal load for at least twoseconds.2. Deactivate the conditions for accelerated function.3. Apply a phase-to-earth fault at 100% of line impedance.4. Check that the fault is tripped with the second zone time delay.5. Provide the IED with conditions equivalent to normal load for at least twoseconds.6. Activate the condition for accelerated function either by the autorecloser orby the loss-of-load.7. Apply a phase-to-earth fault at 100% of line impedance.8. Check that the fault is tripped instantaneously.11.11.4.2 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.11.11.5 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.11.11.5.1 Testing the directional comparison logic function M13926-7 v21MRK 505 378-UEN A Section 11Testing functionality by secondary injectionLine differential protection RED670 2.2 IEC 243Commissioning manual
