Rotor Services

  • Brushless exciter test, inspection and complete overhaul
  • Field ground detector troubleshooting for both RF and Optical systems
  • Retaining Ring inspection, removal & replacement
  • Non-destructive testing (NDT) of retaining rings
  • Collector ring repair, replace, and machining
  • Complete rotor rewind
  • Post-rewind high speed balancing
  • Radial hydrogen seal replacement
  • Wedge replacement
  • Repair turn shorts
  • Terminal Stud repair & replacement
  • Endwind blocking
  • Creepage blocks

Rotor Testing

  • Insulation resistance & polarization index (“megger & P.I.”)
  • DC resistance testing
  • AC impedance test
  • Pole balance test
  • Recurring Surge Oscillography (RSO) test for shorted turns
  • Hydrogen seal pressure test for leaks
  • Borescope visual inspection

Additional Capabilities

  • Consultant services
  • Root cause analysis
  • Silver plating (electro-plating) bus work mating surfaces

Stator Services

  • End winding resonance detection and repairs “bump test”
  • Connection ring / parallel ring re-blocking & re-tying
  • End winding, re-blocking, & re-tying based on bump test & visual inspection results
  • End winding stiffening treatment
  • Corona and partial discharge activity abatement
  • Stator re-wedging
  • Flux probe installation
  • Dry ice “CO2” blasting excessively contaminated stators
  • High voltage bushing replacement
  • Temporary High voltage bushing & terminal plate leak repairs (“damming”)
  • Replacement of stand-off insulators
  • Stator core iron repairs

Stator Testing

  • Insulation resistance & polarization index (“megger & P.I.”)
  • DC Leakage test and Hi Pot
  • ELCID testing for core faults
  • Digital wedge mapping
  • Ripple / PSDS spring depth gage testing for wedge tightness
  • DC resistance testing of each phase
  • Bump test / modal analysis of end windings & connection rings
  • Corona camera
  • Doble / Tan-Delta / Power Factor testing
  • Thermographic detection of high resistance connections
  • Westinghouse / MHI inner-cooled unit testing including:
    • Transposition Testing
    • Tube to tube resistance test
    • Tube to copper resistance test
    • Core through bolt & building bolt torque checks & re-tightening
    • Megger of through bolts
    • Parallel ring flow testing