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李殷雄,金宗謙 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2
In recent year, vacuum circuit breakers (VCB) have been widely used as the power supply breaker of high voltage motors, to enhance the efficiency and to make the maintenance of waterworks equipments easy. Poweful surge voltage, a repetitive phenomenon of reignition, occured when the VCB is switching between on and off, and is transmitted to the stator winding of motor through the cable. This surge voltage is repeated several times, though the action of the circuit breaker (CB) is not completed, and if the suge voltage is culmulated, the motor becomes burned by owing to breakdown of winding at the end. In this study, the surge voltage occuring at the opening and closing of the VCB was analyzed as the transient phenomenon by circuit parameters. By examining the variances of peak value, duration of wave-front, and duration of wave-tail under the variances of length and capacity of the cable, we could expect to protect the breakdown of winding with parallel connection of suitable capacitance in the motor.