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 390
measuring a very heavy current. Method 2. — This method differs from Method 1 only in that the sec-ondary is short-circuited directly on itself, an ammeter being inserted in theprimary circuit. The diagram of connections is shown in Fig. 64. In con-necting up the voltmeter and the potential coil of… … Fig. 64. Impedance Test with Wattmeter.Having the readings of amperes, volts, and watts, we obtain from thefirst two the impedance of the transformer. This impedance is the geo-metrical sum of the resistance and reactance, and is expressed algebraicallyas follows : Z=ViJ2-+-(2B7lZ)8» where z =…
Electrical engineering
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