This special program is a complete and comprehensive rotor in situ generator assessment. Minimal disassembly of the generator is required; thus, the generator never becomes the critical path of the outage unless an outage is planned specifically to address major maintenance on the generator.
Features:
- Turbine Generator Stator (TGS) 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).
- Turbine Generator Stator (TGS) Electrical Testing:
- Armature Winding Copper Resistance Measurements.
- Armature Winding Insulation Resistance Testing.
- Armature Winding Polarization Index Testing.
- Armature Winding DC High Voltage Testing:
- Stepped Voltage Testing.
- 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 with corona camera examination.
- Electromagnetic Core Imperfection Detection (El CID) Testing utilizing the ARGIS robot and an IRIS Power EVOLUTION™).
- Wedge Tightness Mapping (utilizing the ARGIS robot and an IRIS Power SWA™).
- Stator Slot RTD Resistance Measurement.
- Stator Slot RTD Insulation Resistance Testing.
- Turbine Generator Rotor (TGR) 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).
- Turbine Generator Rotor (TGR) 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.
- Main Field Winding AC Pole Drop Testing (as accessible).
- Main Field Winding Recurrent Surge Oscillograph (RSO) Testing.
- Turbine Generator Exciter 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).
- Turbine Generator Exciter Electrical Testing:
- Brushless Exciter Armature Insulation Resistance Testing.
- Brushless Exciter Stationary Field Insulation Resistance Testing.
Benefits:
- Reveals partial discharge activity and deterioration in windings, blocking and stator wedge tightness condition, which would be otherwise obstructed with the rotor-in.
- Record of stator core lamination condition.
- Record of rotor retaining ring, wedge and rotor body condition.
- Essential documentation to establish a trend report to monitor future deterioration.
- Turn-Key and Field Based.
