Determining relay settings for motor protection using published and empirical data
Conference
·
· Proceedings of the American Power Conference; (USA)
OSTI ID:7085940
- Virginia Power Co., Richmond, VA (USA)
- Westinghouse ABB Power T and D Co., Protective Relay Div., Allentown, PA (US)
This paper describes the relation between the thermal limit curves and the published parameters of an induction motor and how this data is used to determine relay settings for thermal and fault protection of stator and rotor. This is done using the high inertia drive example of a 6000 HP induced draft fan motor. The application example includes the input data, method, and results of a complete motor starting study which determines the temperature rise in the motor during starting. The study is carried out using a PC application program which was written to calculate and plot starting current, speed, torque and rotor temperature versus time. The plot provides the same information as an oscillograph of an actual starting condition. This data is then used to compare the application method and effectiveness of a conventional overcurrent relay scheme requiring underimpedance supervision with microprocessor based protection employing rotor and stator thermal models.
- OSTI ID:
- 7085940
- Report Number(s):
- CONF-890425--
- Conference Information:
- Journal Name: Proceedings of the American Power Conference; (USA) Journal Volume: 51
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
24 POWER TRANSMISSION AND DISTRIBUTION
240100 -- Power Systems-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
CALCULATION METHODS
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
ELECTRIC GENERATORS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
INDUCTION GENERATORS
MICROCOMPUTERS
OVERCURRENT
PARAMETRIC ANALYSIS
PERSONAL COMPUTERS
RELAYS
ROTORS
TORQUE
200104* -- Fossil-Fueled Power Plants-- Components
24 POWER TRANSMISSION AND DISTRIBUTION
240100 -- Power Systems-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
CALCULATION METHODS
COMPUTERIZED CONTROL SYSTEMS
COMPUTERS
CONTROL SYSTEMS
DIGITAL COMPUTERS
ELECTRIC GENERATORS
ELECTRICAL EQUIPMENT
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
INDUCTION GENERATORS
MICROCOMPUTERS
OVERCURRENT
PARAMETRIC ANALYSIS
PERSONAL COMPUTERS
RELAYS
ROTORS
TORQUE