This rotor-in inspection program is designed to fit in a 3-4 day turbine outage window (i.e. steam turbine valve inspection, gas turbine combustion inspection, or hot gas path inspection).
Features:
- Turbine Generator Stator (TGS) Inspection:
- 59-Point Visual and Borescope Inspection (as accessible)
- TGS Frame (for indications of arcing, oxidation, weld cracks, and other evidence of accelerated aging or damage)
- TGS Connection Ring Assembly (for indications of mechanical dusting or greasing, loose or missing blocks, corona activity, and other evidence of accelerated aging or damage)
- TGS End Windings (for indications of contamination, mechanical dusting or greasing, loose or missing blocks, corona activity, and other evidence of accelerated aging or damage)
- TGS Core Iron (for indications of “fretting”, movement of core bolts, lamination looseness, or any other evidence of accelerated aging or damage)
- TGS Slot Wedge System (for indications of mechanical dusting or greasing, loose and migrating wedges and/or slot fillers, or any other evidence of accelerated aging or damage)
- Electrical Testing:
- Armature Winding Copper Resistance Measurements
- Armature Winding Insulation Resistance Testing
- Armature Winding Polarization Index Testing
- Armature Winding High Voltage Testing:
- DC Stepped Voltage Testing
- DC Maintenance Proof Testing (test voltage to be determined by findings of low voltage testing and approved by customer)
- Power Factor Dissipation and Tip-Up Testing
- Corona Camera Examination (as accessible)
- Stator Slot RTD Resistance Measurement
- Stator Slot RTD Insulation Resistance Testing
- Turbine Generator Rotor (TGR) Inspection:
- 36-Point Visual and Borescope Inspection (as accessible):
- Retaining Rings (for indications of surface pitting, oxidation, and/or cracks, movement or fretting against fits, electrical arcing, or any other evidence of accelerated aging or damage)
- Main Field End Windings (for indications of contamination, copper elongation, deformation, or cracking, migration or turn or ground insulation components, or any other evidence of accelerated aging or damage)
- Rotor Body Wedges (for indications of looseness and/or fretting, electrical arcing, or any other evidence of accelerated aging or damage)
- Rotor Body Forging (for indications of cracking, arcing, overheating, or any other evidence of accelerated aging or damage)
- Coupling(s) and Journals (for indications a significant wear, galling, wiping, stress fractures, or any other evidence of accelerated aging or damage)
- Electrical Testing:
- Main Field Winding Copper Resistance Measurement
- Main Field Winding Insulation Resistance Testing
- Main Field Winding Polarization Index Testing
- Main Field Winding AC Impedance Testing
- AC Pole Drop Testing (as accessible)
- Turbine Generator Exciter (TGE) Inspection:
- 14-Point Visual and Borescope Inspection (as accessible)
- Exciter Windings (for indications of contamination, armature band condition, overheating, or any other evidence of accelerated aging or damage)
- Collector Ring Assembly or Brushless Exciter Assembly (for indications of contamination, looseness and/or fretting, arcing and/or burning, excessive wear, or any other evidence of accelerated aging or damage)
- Brush assembly (for indications of contamination, worn insulators, carbon brush condition, or any other evidence of accelerated aging or damage)
- Electrical Testing:
- Brushless Exciter Armature Insulation Resistance Testing
- Brushless Exciter Stationary Field Insulation Resistance Testing
Benefits:
- Reveals additional data on armature winding insulation integrity to more accurately assess life and future maintenance requirements
- Reveals assessment of end winding stability (resonance conditions can be immediately corrected to avoid premature winding deterioration)
- Record of core tightness
More complete documentation for planning future maintenance.
