Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 316
hin sheets of springcopper which contact edge-wise against solid copper ter-minal blocks. This instru-ment may be adjusted toopen the circuit which it pro-tects for any predeterminedcurrent strength between thelimits of 20 % less than, and50 % in excess of, the normalcurrent. When generators are… … Fig. 198. CENTRAL-STATION EQUIPMENT. 305 scribed, may be used for this purpose when provided witha relay ; or, better still, a circuit breaker equipped with twosolenoids may be used, one of which operates on the passageof an excessive current and the other on the flowing of areverse current. A…
Electric machinery
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