Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 41
the oil-switch trip-coil circuit, being arranged togive instantaneous action; they may be eitherthree single-core relays, one for each phase,or one triple-core type as shown. The chief methods of balancing are byopposing equal emf (as in illustration), andby employing the balance current to… … Merz-Price Automatic Balanced Protective System A, Trip-coil switch. E, Three-pole relay. 0, Three-core, pilot cable. D, Three-phaae ht feeder cable.F, Current transformer with non-inductive shunt. O, Oil switch. E, Earth. relay is connected. The emf balance is foundbest for feeder-cable…
Electrical engineering
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