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 126
ble forenergizing the trip coil. CURRENT AND PRESSURE LIMITING DEVICES 1,645 Ques. What is the objection to alternating currenttrip coils? Ans. They have relatively high impedance and impose aheavy volt ampere load on the transformers. Circuit Closing Relays.—The duty of a circuit closingrelay is… … Figs. 2,283 to 2,291.—General Electric instantaneous overload circuit opening relays,coversremoved. Circuit opening rela\-s are used chiefly in those cases where direct current forthe tripping circuit is not available. Alternating current trip coils have relatively highimpedance and impose a heavy…
Electrical engineering
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