GE Generator Rotor Design, Operational Issues, and Refurbishment Options

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GE Generator Rotor Design, Operational Issues, and Refurbishment Options
Table of Contents

  • Overview. . .1
  • Function of a Generator Rotor. . .1
  • Types of Generator Rotors . . .4
  • Conventional Windings. . .4
  • Generator Rotors with Aluminum Alloy Windings. . .5
  • Direct-Cooled Windings . . .5
  • Radial Flow Cooling . . .5
  • Radial-Axial-Radial Cooling . . .6
  • Diagonal Flow Cooling . . .7
  • Laminated Rotors. . .7
  • Current 4-Pole Salient Pole Rotors. . .8
  • Problems Encountered with Generator Rotors . . .8
  • Shorted Turns and Field Grounds . . .8
  • Thermal Sensitivity. . .10
  • Contamination. . .11
  • Collector, Bore Copper and Connection Problems. . .12
  • Copper Distortion. . .12
  • Forging Concerns. . .12
  • Retaining Ring Concerns. . .13
  • Misoperation . . .15
  • Generator Rotor Reliability and Life Expectancy. . .15
  • Generator Rotor Life . . .15
  • Generator Experience. . .16
  • Generator Rotor Refurbishment and Replacement. . .16
  • Generator Rotor Rewind. . .16
  • Reasons for Rewinding. . .16
  • Types of Insulation. . .17
  • Generator Rotor Modifications, Upgrades and Uprates . . .18
  • Impact on Other Components. . .19
  • Generator Rotor Replacement . . .20
  • Exchange Field . . .20
  • New Field . . .20
  • GE Generator Rotor Design, Operational Issues, and Refurbishment Options
  • Rewind, Refurbishment and Replacement Recommendations Versus Risk . . .20
  • New Replacement Rotor . . .20
  • Exchange Field . . .20
  • Rewind with New Copper. . .21
  • Rewind Reusing Old Copper . . .21
  • High Speed Balancing. . .21
  • High Speed Balance . . .21
  • Flux Probe Test . . .21
  • Thermal Sensitivity Test. . .22
  • Conclusion . . .22
  • Frequently Asked Questions . . .22
  • List of Figures . . .24
  • List of Tables. . .24
Download GE Generator Rotor Design, Operational Issues, and Refurbishment Options pdf from www.gepower.com, 28 pages, 924.57KB.
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