Monitoring and Diagnosis Items Partial Discharge •Throughtheanalyzerinstalledinthefield,UHFsignal,generated when partial discharge occurs in GIS, is captured, and the PD magnitude (pC), cause, location, tendency, and risk are analyzed to provide reasonable data on the operating condition. •Monitoringtimeandservicelifecanbeforecast,andawarning(message) is issued and monitoring instructions are provided when the set limits are reached. Φ Φ •FeaturessuchasPRPD( -q-n), PRPS ( -q-t), and noise masking are offered selectively. •Externalnoisesensorfornoiseelimination(Optional) Lightning Arrester Degradation Monitoring •Thetotalleakagecurrentand3rdharmonicleakagecurrentofthe lightning arrester are monitored constantly, and at the same time the trend can be identified. •Whenthethresholdvaluearereached,awarning(message)is issued, and the information on monitoring time and remaining service life is provided. SF Gas Density 6 6 •Usinggasdensitysensors,thepressureofSF gas (GIS insulation medium) is monitored, and a sensor is mounted in each gas section to monitor the gas-tightness. •Duringinternalflashover,thoughveryrare,theinstantaneousriseinpressure is identified to locate where failure has occurred and to allow prompt maintenance. Operating Characteristics of CB The measurement of the current and operating time of trip coil, the current and operating time of close coil, the operating time of mechanical aux. contact and CB traveling curve are measured to find if there is any problem with the control circuit, control pressure or CB, if there is any delayed operation in the hook/pilot/main valve, any problems with CB due to abrasion/deformation. I 08 09 HiCMS Hyosung intelligent Condition Monitoring System