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Periodically, all hydroelectric generators require a major overhaul. The extent of the work required during an overhaul will depend a great deal on operating conditions such as water quality and how the unit was loaded. In order for the overhaul to proceed smoothly and to accomplish all the work required, planning should start well before the overhaul starts. Maintenance records, One of the best sources of information in planning a major overhaul should be the maintenance records for the unit or units involved. Inspection, The inspection should include, but not be limited, to the following items: Turbine runner. Unwater the unit and install draft tube scaffolding to allow the inspection of the underside of the runner. Check each bucket carefully for cavitation damage and cracks. Draft tube. Check condition of coating on draft tube liner’ Look for any cavitation damage, Spiral case and penstock. Check condition of interior coating and exterior coating of exposed portions of penstock. Bearings. Check condition and dimensions of all spare guide and thrust bearings. Have bearings rebabbitted if necessary. Generator rotor. Thoroughly inspect all stress carrying parts of rotor for cracks. Pay particular attention to welds on the rotor spider. Generator air coolers. Check for any leaks. If possible, inspect interior of tubes for scale buildup or corrosion. If spare coolers are available, make sure they are ready for installation. INSPECTION AND REPAIR OF UNIT COMPONENTS, REASSEMBLY, Torque or stretch of bolts, Wicket gate adjustment. Final inspection, Visual inspection of generator housing and spiral case, Bearing and PMG insulation.
Tags : thrust bearings, wicket gate, hydroelectric generators, air coolers, mechanical overhaul, draft tube, overhaul procedures, interior coating, maintenance records, scaffolding, rotor, cavitation damage, sources of information, leaks, corrosion
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