Temporary operation of motors with cut-out coils. Final report
Technical Report
·
OSTI ID:5571499
A project was undertaken to evaluate the performance of auxiliary power plant induction motors which have suffered stator winding failures and have then been restored to temporary service by cutting out and by-passing the failed coils. Both the circulating current within a multi-circuit phase and the changes in phase current as a result of coil cutouts were analyzed in terms of motor impedance parameters. Cooperative effort with a major utility indicated, however, that precise parameter and stator winding data would not usually be on file for the failed auxiliary motor. Therefore it was decided to present numerical results in this report based on a set of per unit values of motor impedances which are believed to be representative of typical power station auxiliary induction motors now in service. Calculation procedures are provided to permit quick estimates of motor current and temperature when the motor is operating with coils or complete circuits cut out. Examples are included to illustrate the use of the calculation procedures for various types of stator winding failures. In addition, recommendations are given for improving thermal or mechanical performance in certain cases.
- Research Organization:
- Technology Assessment Group, Inc., Schenectady, NY (USA)
- OSTI ID:
- 5571499
- Report Number(s):
- EPRI-EL-4059; ON: TI85920713
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
AUXILIARY SYSTEMS
AVAILABILITY
DESIGN
DOCUMENT TYPES
ELECTRIC COILS
ELECTRIC GENERATORS
ELECTRIC IMPEDANCE
ELECTRIC MOTORS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
IMPEDANCE
INDUCTION GENERATORS
MAINTENANCE
MANUALS
MOTORS
OPERATION
OUTAGES
PERFORMANCE
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
200104* -- Fossil-Fueled Power Plants-- Components
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
AUXILIARY SYSTEMS
AVAILABILITY
DESIGN
DOCUMENT TYPES
ELECTRIC COILS
ELECTRIC GENERATORS
ELECTRIC IMPEDANCE
ELECTRIC MOTORS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
EQUIPMENT
IMPEDANCE
INDUCTION GENERATORS
MAINTENANCE
MANUALS
MOTORS
OPERATION
OUTAGES
PERFORMANCE
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS