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 152
of oil absorbs considerable heat,so that the rise of temperature is retarded. Hence, for moderate periods 1,410 HAWKINS ELECTRICITY of operation, say 3 or 4 hours, the average lighting period, the maximurntemperature would not be reached. Ques. In what other capacities except that of coolingagent,… … Fig. 1.96S.—Wagner 300 leva, 4,400 volt three phase oil cooled transformer. Tn this type oftransformer the case is filled with oil and fluted so as to increase the cooling surface, an oildrain valve is screwed to a wrought iron nipple cast into the base, the duct to which is in sucha position as to…
Electrical engineering
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