9.9.5 Current reversal and weak-end infeed logic for residualovercurrent protection ECRWPSCH M13936-2 v8Prepare the IED for verification of settings as outlined in section "Requirements"and section "Preparing for test" in this chapter.Values of the logical signals for ECRWPSCH are available on the Local HMIunder Main menu/Tests/Function status/Scheme communication/ECRWPSCH(85)/ECRWPSCH:1.The Signal Monitoring in PCM600 shows service values that are available on theLocal HMI as well.First, test the four step residual overcurrent protection function EF4PTOC and thenthe current reversal and weak-end infeed logic according to the correspondinginstructions. Then continue with the instructions below.9.9.5.1 Testing the current reversal logic M13936-9 v71. Inject the polarizing voltage 3U0 to 5% of UBase and the phase anglebetween voltage and current to 155°, the current leads the voltage.2. Inject current (180° — AngleRCA) in one phase to about 110% of the setoperating current of the four step residual overcurrent protection (IN>Dir).3. Check that the IRVL output is activated in the disturbance recorder after theset time tPickUpRev.4. Abruptly reverse the current to AngleRCA setting lagging the voltage, tooperate the forward directional element.5. Check that the IRVL output still is activated after the reversal with a timedelay that complies with the setting tDelayRev.6. Switch off the polarizing voltage and the current.9.9.5.2 Testing the weak-end infeed logic M13936-25 v2If settingWEI =Echo M13936-27 v81. Inject the polarizing voltage 3U0 to (180° — AngleRCA) of UBase and thephase angle between voltage and current to 155°, the current leads thevoltage.2. Inject current (180° — AngleRCA) in one phase to about 110% of the settingoperating current (IN>Dir).3. Activate the CRL binary input.No ECHO and CS should appear.1MRK 506 383-UEN A Section 9Testing functionality by secondary injectionLine distance protection REL650 2.2 IEC 155Commissioning manual
