Synchronous machine operation with cutout coils: Final report
Technical Report
·
OSTI ID:6979779
A project was undertaken to evaluate the performance of power plant three-phase synchronous motors and generators which have suffered stator winding failures and have then been restored to temporary service by cutting out and bypassing the failed coils. Both the circulating current within a multi-circuit phase and the changes in line current as a result of coil or circuit cutouts were analyzed in terms of machine impedance parameters. Cooperative effort with two major utilities indicated, however, that precise parameter and stator winding data would often not be on file for the failed machine. Therefore, numerical results are presented in this report based on a set of per unit values of impedances which are believed to be reasonably representative of typical power station synchronous machines now in service. Calculation procedures are provided to permit quick estimates of motor or generator current and temperature when the machine is operating with coils or complete circuits cut out. Examples are included. Recommendations are given for improving thermal or mechanical performance.
- Research Organization:
- Power Technologies, Inc., Schenectady, NY (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6979779
- Report Number(s):
- EPRI-EL-4983; ON: TI87920197
- Country of Publication:
- United States
- Language:
- English
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