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 123
t. Regulative Relays.—This class of relay is used to controlthe condition of a main circuit through control devices operatedby a secondary circuit. 1,642 HAWKINS ELECTRICITY Ques. For what service are relays of this class em-ployed ? Ans. They are used as feeder circuit or generator… … FlG. 2,280.—Diagram showing a railway synchronous converter protected by a single pole ovei-load circuit breaker with low voltage release attachment and bell alarm switch. Thelow voltage attachment trips the breaker on failure of direct current voltage also whenspeed limit device closes. Internal…
Electrical engineering
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