Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 117
172. Fig. 171.—Connections for starting three-phase induction motor where the starting switchis external to the auto-transformer case. Rating: 300 amp. per phase up to 550 volts, 100amp. per phase above 2500 volts. Fig. 172.—Connections for starting any number of three-phase induction motors with… … Fig. 173.—Three-phase induction motor with wound secondary. The resistance, R,connected across the slip rings may be internal or external. It is left in circuit until the motorhas come up to speed, when it is short-circuited. When external to the motor, it is sometimesused to regulate the speed,…
Electric wiring
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