Rotor Services
Be it a forced or planned outage, Keystone responds to customer needs for rotor services in a swift, effective manner. Inspections, Electrical testing, Rewinds, Mechanical repairs and Retaining ring replacements are but of few of the tasks Keystone’s experienced staff provides customers for generator rotors.
Visual inspections
- Inspection of tooth tops and wedges for stress cracking
- Inspection for loose wedges and/or balance weights
- Inspection of retaining ring fit for arcing or burning
- Inspection of collector rings for discoloration or wear
- Journal inspections
- Inspection of cooling passages for blockage
- Radial lead inspection
- Visual inspection of blower assemblies
Mechanical Testing
- Rotor bore pressure test to check radial lead seals
- Boroscopic inspections
- Journal dimensions and run outs
NDE
- UT & PT retaining rings/zone rings
- UT & PT blower hubs/couplings/shaft ends
- Boresonic inspections
- Tooth top inspections
Electrical testing
- RSO testing of rotor winding
- Short and/or ground locations
- Step impedance/pole balance
- DC resistance measurement
- Insulation Resistance
Repairs
- Complete rotor rewinds with class F insulation including high or low speed balance
- Retaining ring replacement
- Journal machining on or off site
- Collector ring changeout
- Radial/axial lead refurbishment/replacement
- Repair top turn migration and/or cracking (GE)
- J-strap and/or coil crossover replacement (GE)
- Pole crossover replacement (WH)
- Repairs of turn-to-turn shorts and/or grounds