. 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. ture al-ternator, designed for use insmall power plants and isolatedlighting plants where inductiveloads are encountered. Builtfor pressures of 120, 240. 480,and 600 volts. These voltageshave been recommended by theAmerican Institute of Electri-cal Engineers, and will cover theneeds of any set of conditionsordinarily met with. Thesestandard voltages not onl
. 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. ture al-ternator, designed for use insmall power plants and isolatedlighting plants where inductiveloads are encountered. Builtfor pressures of 120, 240. 480,and 600 volts. These voltageshave been recommended by theAmerican Institute of Electri-cal Engineers, and will cover theneeds of any set of conditionsordinarily met with. Thesestandard voltages not only per-miteconomical distribution, butthey are such that no trans-formers are necessary to re-duce the line pressure for ordi-nary cases. For transrrittingpower relatively long distances,600volt,= is usually there is a demand for480 volt service, a 480 volt al-ternator should be selected andif lower voltages arealso desiredan auto-transformer may befurnished by means of which 240 volts can be obtained. When 120 volt circuits are necessarv for lighting, etc., the240 volt pressure can be still further reduced to 120 volts bv means of another auto-transformer. However, this double reduction will rarelv be found Fig. —Western Electric station-ary armature. In this type ofarmature, the core upon which thewinding is placed, is built into theframe as shown, the core teeth pro-jecting inwardly like internal gearteeth, forming a cylindrical cham-ber for the revolving field. The coreis built up of iron, laminated andjapanned to prevent eddy currentsand hysteresis losses. The lamina-tions are rigidly bolted betweentwo heavy end plates. The arma-ture coils are of copper bar im-pregnated with insulating com-pound. They are held in the slotsby wedges which allow their readyremoval for inspection or repairs. HAWKIXS ELECTRICITY --
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