6.1. Make sure that it is correctly measured.6.2. Try to change the Viewed quantity to Fault resistance as 10kΩ isrelatively small.You should be able to measure approximately 10kΩ here. If you choose toview fault conductance, the measurement corresponds to approximately1×10-4 Mho.7. Apply another known fault, say 1kΏ and verify that it is measured correctly.8. Apply a short circuit and monitor the measurement: the measured resistance shallbe close to 0Ω; the value of this measurement is an offset that will affect allperformed measurements. If this value deviates from zero more than 10% of theTrip setting, a new calibration shall be performed with a better calibrationresistance at the second step: that may increase the accuracy of measurements.9. When you are completely sure that the function measures correctly, stop themeasurements and remove any applied faults.Previously it was verified that the function measures correctly by applying knownfaults and observing the graph during monitoring. Besides measuring the faultsize a trip indication is required when a large fault is measured to prevent that adamage to the generator occurs. To allow the specific function to issue a tripindication, it must first be enabled:9.1. Select the Enable Function Tripping button in the ICT toolbar.9.2. Choose Yes in the pop-up message.ICT now writes this to IED.9.3. By default the trip level is set to 1kΩ. In other words, if the fault resistanceis lower, then the function issue trips.10. Verify the measurements by applying various faults.Trip indication shall be visible in the ICT toolbar.11. Verify that TRIP and ALARM signals are connected to tripping/alarming/signaling/communication in accordance with the scheme design.It is very important that the Function Tripping is Enabled under thefollowing situations:• After completion of the calibration step• Before leaving the ICT Tool6.7 Auditing GUID-70137BAD-6BD5-4835-964E-B6ADAE522A15 v1During installations, calibrations and commissions the ICT generates reports for eachof the steps and collects them under the Auditing tab. See the procedures below on howto view and delete reports as well as generate logs from reports.Section 6 1MRK 502 073-UUS ACalibrating injection based sensitive rotor earth fault protection74 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062Commissioning manual
