GRIP® Level-3

This rotor-out inspection is designed to fit in a Major Inspection turbine outage window (i.e. steam turbine valve, single cylinder inspection, gas turbine hot gas path inspection, or turbine majors).

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)
  • Electromagnetic Core Imperfection Detection (El CID) Testing utilizing an IRIS Power EVOLUTION™)
  • Wedge Tightness Mapping (utilizing an IRIS Power SWA™)
  • 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)
  • Recurrent Surge Oscillograph (RSO) Testing

  • 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 partial discharge activity and deterioration in windings, blocking and core tightness which were obstructed by a rotor-in examination.
  • 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 Service Based

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