standards / manuals / guidelines for small hydro development - AHEC

Sl.No.Assembly Item Check Point Method Remark & RemedialMeasures18. Rotor Shaft Slipring and Dial gauge Check for run out atvibration couplingslipring and turbinecoupling and readjust iffound more than thespecified value.VibrationRebalance if necessaryBracketvibration19. Rotor pole DampersystemstructureInterconnectionbetween polesSupportingstructure forpropertightnessBalancingequipmentVisualBy tappingBy shakingTighten and lockproperly if supportingstructure found loose.20. Top shaft Currentcarryingleads21. GeneratorAuxiliaries22. Cooling watervalves23. Over speeddeviceCheck forproperoperationCheck forproperoperationPlunger &contactmechanismInsulationprovide onsupportingTightness ofclamps GeneralconditionVisualRectify if founddamaged.Visual Repair insulation iffound damagedClean that these are ingood workingconditionClean & replace glandswhere needed.Proper operation4.2.4 Capital Maintenance of HydrogeneratorDismantling:- Decouple generator shaft and turbine shaft after recording guide bearing clearances air gapsbetween stator & rotor air gaps of main, pilot exciter & PMG etc if mounted on shaft.- Dismantling other components one by one in proper sequence till rotor is free to be lifted.- Rotor should be taken out very carefully and kept in rotor assembly pit duly bolted with baseplat. Rotor rim to be supported by block and jacks all around the circumference.- All stator air coolers are to be dismantled and kept for testing and repair.- Braking & jacking units to be dismantled- All cares are to be taken during dismantling to ensure safety of all components, fastners, pinsetc.- Prior arrangement of proper T&P, special T&P, slings, D-shackles etc, is also necessary.Maintenance of Stator:- Stator FrameAHEC/MNRE/SHP Standards/ E&M Works – Guidelines for Operation and Maintenance of Small Hydropower Station 41