. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. be encountered. This condition existsin a line where power is supplied to induction motors, transformers or other inductiveapparatus. The tvpe here shown is built in sizes from 37? 2 kw. to 200 kw., 60 cycles, twoor three phases and voltages of 240, 4S0, 600, 1,150 or 2,300 volts. They may be operatedas single phase alternators bv using two of the phases an
. Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise. be encountered. This condition existsin a line where power is supplied to induction motors, transformers or other inductiveapparatus. The tvpe here shown is built in sizes from 37? 2 kw. to 200 kw., 60 cycles, twoor three phases and voltages of 240, 4S0, 600, 1,150 or 2,300 volts. They may be operatedas single phase alternators bv using two of the phases and may then be rated at 70 per the polyphase rating. The field is excited by direct current at a pressure of 125 alternators may be used as synchronous motors and for this duty are fitted withamortisseur winding in the pole faces which does not interfere with their use as alternators. Single Phase Reactions.—Unlike three phase currents, a singlephase current in an alternator armature produces a periodic disturbanceof the flux through the machine. In the magnet system this disturbanceis of twice the normal frequency, while in the armature core it is the HAWKIXS ELECTRICITY *c 2 £~ = ? T = = - £S4 2.
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