Title :
Effects of system parameters and circuit breaker characteristics on switching large synchronous motors
Author_Institution :
ARAMCO, Dhahran, Saudi Arabia
fDate :
3/1/1988 12:00:00 AM
Abstract :
Interturn insulation breakdown in stator windings resulted in the failure of thirteen 21000 HP synchronous motors. To confirm if the failures were caused by steep-front voltage surges, field measurements were conducted during switching operation of one of the compressed air magnetic circuit breakers in one of the affected plants. The results indicate that the number of motors running in parallel with the one being switched affects the magnitude of the generated overvoltage. It is concluded that the failures occurred as a result of breaker tripping during aborted motor starts (while running-up to speed)
Keywords :
circuit breakers; electric breakdown of solids; machine insulation; stators; switching; synchronous motors; 21000 hp; circuit breaker characteristics; compressed air magnetic circuit breakers; interturn insulation breakdown; stator windings; steep-front voltage surges; switching; synchronous motors; system parameters; Circuit breakers; Electric breakdown; Insulation; Magnetic field measurement; Magnetic switching; Stator windings; Surges; Switching circuits; Synchronous motors; Voltage measurement;
Journal_Title :
Energy Conversion, IEEE Transactions on
