Experimental Electrical Engineering and Manual for Electrical Testing for Engineers and for Students in Engineering Laboratories Volume 2
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Experimental Electrical Engineering and Manual for Electrical Testing for Engineers and for Students in Engineering Laboratories Volume 2

Experimental Electrical Engineering and Manual for Electrical Testing for Engineers and for Students in Engineering Laboratories Volume 2


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...cuts the secondary conductors at a rate proportional to (rii--712) when the rotor is revolving; with the armature locked the speed at which the conductors are cut by the flux is equal to n. The frequency of the secondary currents being thus greatly increased, the reactance of the secondary is thereby also increased the same number of times. By adding such an external resistance that the rotor resistance is increased n + (n--n2) times, the same current and the same electrical relations are obtained in the secondary, as with the rotor revolving; consequently, the primary current will have the same value and the same power factor. Varying O m Fig. 445. First proof of the circle diagram: the induction motor is reduced to an equivalent transformer. the external resistance is equivalent to varying a brake load with the armature revolving. In this way the induction motor is reduced to a stationary transformer, with an abnormal leakage and with a secondary load of non-inductive resistances, varying in value from zero to infinity. Such a transformer can be replaced by an equivalent resistance and an equivalent reactance (see 499), and the problem is reduced to merely this: A non-inductive load is connected to a constant-potential line, with some resistance and some inductance in series with it (Fig. 363). The locus of the current vector when the load changes from zero to infinity is to be determined. This problem is solved in Fig. 445. CD represents the vector of the line voltage, which is constant; CI is the current at a certain load. CF, in phase with the current, represents the resistance drop; FD, perpendicular to the current vector, represents the reactive drop. CD, the geometrical sum of CF and FD, is constant; as the latter two...


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Product Details
  • ISBN-13: 9781154911817
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 126
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1154911810
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 240 gr


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