Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 398
herdesired current in the secondary, as shown by the ammeter. The readingof the wattmeter will then show the total copper losses in the transformerand in the ammeter plus a very small and entirely negligible iron loss. Theammeter losses and that in the leads may be calculated by I2B. The smalliron… … FiG. 71. Dr. Sumpners Test for Copper Losses. The iron loss is proportional to (jy16 and (g, the magnetic density is pro-portional to the pressure at the terminals of the transformer, therefore theiron loss is equal to A.(glh where K is a constant and (ft the voltage. In theiron-loss test the (ft =…
Electrical engineering
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