Electrical Engineer generator service engineering studies, NERC compliance, unplanned outage fault diagnosis.Įffects of Flex Operation on Turbine Generators – Alejandro Felix, Manager of the Generator Service Engineering Visual inspection along with other tests remain a valuable part of any winding insulation evaluation.ĥ years with Siemens.All testing requires a precheck of the insulation by measurement of insulation resistance and polarization index.DC testing includes dielectric absorption curves up to a high potential level which also provides stator winding diagnostic information.AC testing includes power factor and partial discharge which provide stator winding insulation diagnostic information.
Siemens supports both an ac and a dc test regimens.Generators are increasingly being operated in peaking modes to adapt for an increasing use of renewable technologies, which adds new or accelerated maintenance needs.With innovations in monitoring, third harmonic neutral voltage may potentially allow a user to detect a generator issue before a forced outage occurs.Adequate protection of the stator winding should include a third harmonic protection scheme.Third harmonic neutral voltage is a useful and versatile parameter for detection of generator faults.
What does that mean? This presentation answers that question with discussion on ac and dc testing regimens that are used by Siemens throughout the world and a discussion on other testing during outages to verify the integrity of the generator stator windings.
The Siemens-energy generator inspection lists call for a dielectric evaluation. This presentation discusses the trends observed in recent years to operate generators with more frequent start-stop and load swings as well as some of the effects this has on different generator components. Included will be a discussion of the basic physics principles of third harmonic neutral voltage, the most common strategies for ground fault protection utilizing this voltage, and a few case studies of ground faults where third harmonic voltage was a critical indicator.Įffects of Flex Operation on Turbine Generators The presentation will give an overview of third harmonic stator ground protection. THURSDAY, DECEM 3pm EST/12pm PST Presentation Synopsis Third Harmonic Stator Ground Protection, Effects of Flex Operation on Turbine Generators, and Hipot Testing Philosophy
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