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 (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 194
umns are supported on substantial cast ironblocks on wooden bases. Ques. How are choke coils cooled? Ans. By air, or by oil. Ques. For what service are oil cooled choke coils used? Ans. On circuits of pressures above 25,000 volts, chokecoils immersed in o;l, as are transformer coils, have… … Fig. 2,412.—Westinghouse air cooled choke coil, for voltages of from 2,200 to 110,000. Inconstruction, the coils are made of aluminum rod wound into a helix of about 15 inchesin diameter and having 20 turns. The helix is supported on two insulators. For me-chanical reasons it is necessary to have…
Electrical engineering
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