Stator Services

At a moment’s notice, Keystone’s staff of experienced generator specialists and technicians can mobilize to a site with state of the art equipment to affect a broad array of stator services. Whether the need is to test, inspect, evaluate the stator, re-stack iron, completely rewind and upgrade the stator coil support structure, Keystone provides customers with cost effective solutions to any stator problem that might be encountered.
Visual Inspections
- Core
- End-winding and support system
- Main and neutral leads
- Bushings
- Main and neutral lead box and enclosures
Mechanical testing
- Frequency response testing
- Digital wedge tightness evaluation
- Frame foot loading
- Pressure decay test
- Vacuum decay testing
- Helium leakage testing
Electrical testing
- Insulation Resistance/Polarization Index
- DC winding resistance
- RTD resistance measurements
- DC high potential testing
- Transportation testing
- Tube to tube resistance
- Vent tube/parallel ring flow testing
- Tube to copper resistance
- Electromagnetic Core Imperfection Detector Test (EL CID)
- Thermovision scan (loop test)
- Capacitance mapping
Repair services
- Rewind with new coils and class F insulation
- Rewinds with refurbished coils/ coil repair on site
- Core tightening
- Core lamination repairs
- Core lamination replacement
- End winding tightening
- Strand repairs
- Bushing repair and replacement
- Re-wedge
- Water box leak repair
- Epoxy
- Permanent mechanical repair
Modifications
- End winding support system decoupling
- Through bolt nut upgrade
- Stator coil design upgrade
- Flux probe installation
- PDA coupler installation
- Tagging compound installation