Observe: Do not exceed the maximum permitted overloading ofthe current circuits in the IED.5. Compare the measured operating current with the set value.6. Set the operation mode to 2 out of 3 and inject current into one of the phases.Check - no operation.10.4.1.2 Completing the testContinue to test another function or end the test by changing the TestMode setting toOff. Restore connections and settings to their original values, if they were changed fortesting purposes.10.4.2 Four step phase overcurrent protection 3-phase outputOC4PTOCPrepare the IED for verification of settings outlined in section "Preparing the IED toverify settings".10.4.2.1 Verifying the settingsVerification of the non-directional phase overcurrent function is doneas instructed below, without applying any polarizing voltage.1. Connect the test set for current injection to the appropriate IED phases.If there is any configuration logic that is used to enable or block any of the fouravailable overcurrent steps, make sure that the step under test is enabled (forexample, end fault protection).If 1 out of 3 currents for operation is chosen: Connect the injection current tophases L1 and neutral.If 2 out of 3 currents for operation is chosen: Connect the injection current intophase L1 and out from phase L2.If 3 out of 3 currents for operation is chosen: Connect the symmetrical three-phase injection current into phases L1, L2 and L3.2. Connect the test set for the appropriate three-phase voltage injection to the IEDphases L1, L2 and L3. The protection shall be fed with a symmetrical three-phase voltage.3. Block higher set stages when testing lower set stages by following the proceduredescribed below:3.1. Set the injected polarizing voltage slightly larger than the set minimumpolarizing voltage (default is 5% of UBase) and set the injection current tolag the appropriate voltage by an angle of about 80° if forward directionalfunction is selected.1MRK 511 360-UEN A Section 10Testing functionality by secondary injectionBay control REC670 2.1 IEC 87Commissioning manual
