Minor inspection with generator rotor in place

 

Major inspection (rotor out) with limited testing

 

Major inspection with extensive testing

 

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