Field services – Generators
Stator Maintenance
- On-site maintenance.
- Electrical tests (insulation resistance, ohmic resistance, IP, step voltage, HI-POT, corona probe, WTD, EL CID, power factor, RTD test, partial discharges).
- Visual and videoscopic inspection.
- Cleaning.
- Coating with glyptal.
- Drying treatment.
Minor maintenance on generator rotor
- Visual and videoscopic inspection.
- Electrical tests (insulation resistance, polarization index, ohmic resistance, pole balance, and impedance).
- Dimensional check of stubs.
- Non-destructive testing (NDT) check of retaining rings.
- Exterior cleaning.
- Low-speed balancing.
- Application of glyptal.
- Drying treatment.
- Electrical tests.
Major maintenance on generator rotor
- Initial electrical tests.
- Removal of retaining rings.
- Mechanical inspection.
- Cleaning, ultrasonic testing, and penetrant testing on retaining rings.
- Cleaning coil heads and tightening fasteners and spacer blocks between coil windings.
- General cleaning of the rotor, cooling ducts, and fans.
- Electroplating service for shock absorbers (where applicable).
- Electrical tests.
- Installation of retaining rings.
- Run-out.
- Final electrical tests.
- Application of glyptal.
- Drying treatment.
Generator rotor re-insulation
- Visual inspection upon arrival.
- Mechanical and electrical inspection.
- Run-out and balance verification.
- Remove fans, exciter, and retaining rings.
- Data collection from coils and distribution of spacer blocks.
- Remove wedges and coils.
- Manufacture of devices.
- Cutting and die-cutting of insulating paper between coils.
- Cutting and manufacturing studs.
- Cleaning and NDT of rings.
- Limpieza e inspección de cuñas.
- END y suavizado a cuñas.
- Fabricación de aislantes soportes axiales de bobinas.
- Reaislado e instalación de bobinas.
- Pruebas eléctricas del proceso «Prensado en Caliente».
- Pruebas eléctricas del proceso Run-out.
- Instalación de ventiladores.
- Pintura y tratamiento de secado.
- Pruebas eléctricas del proceso «Balanceo a baja Velocidad».
Stator rewinding
- Initial electrical tests.
- Data collection and winding recording.
- I remove wedges and spools.
- EL CID test.
- Cleaning and conditioning of the core.
- Manufacture of coils and insulation kit.
- Installation of coils and tying down.
- Solder and tape coil heads.
- Electrical tests.
- Install wedges.
- WTD.
- Connect and tape connections.
- Curing of coil heads, lines, and connection bridges.
- Line marking.
- Application and curing of resin and varnish.
- Exterior painting and final finish.
- Final tests.
