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 140
Fig. 2,322.—Differential relay transformer and reverse current circuit breaker discriminatingdevice. A differential relay is one whose electromagnet has two windings. In normalworking these oppose and neutralize one another. Should, however, either winding becomestronger or weaker than the other,…
Electrical engineering
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