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 133
generatorand a sensitive reverse protection to prevent a return of energyfrom the line. 1,652 HAWKINS ELECTRICITY Reverse Phase Relays.—This type of relay is used chieflyto prevent damage in case of reversal of leads in re-connectingwiring to two or three phase motors. Time Element.—It is often… … Fig. 2,306.—Alternating current series reverse phase single pole, circuit closing, two contactrelay for 600 volts or less. This type of relay is used chiefly to open motor circuits fo.-elevators to prevent damage :n case of reversal of leads in reconnecting wiring to twoor three phase motors. The…
Electrical engineering
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