American Electrician; A Journal of Practical Electrical and Steam Engineering Volume 9

American Electrician; A Journal of Practical Electrical and Steam Engineering Volume 9

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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. 1897-01 edition. Excerpt: ... 3, can be taken withinafew To Motor, Lamps or Transformer ing from 300 volts to 3000. VVith the multiplier in circuit, the wattmeter reading must be multiplied by a factor to get the actual number of watts, this factor being the ratio of the capacity in volts with multiplier to the capacity without multiplier. When we come to measure alternating currents we find that it is not as simple From Generator From Generator 5.---WAT'I'METER CONNECTIONS FOR TIIRIE-PHASE CIRCUIT. seconds of each othcr, and will be sufficiently accurate for all practical purposes. Several readings should, of course, be taken in order to get a fair average. In Fig. 4a a a and a' a' a' are the jaws of a triple-pole, double-throw switch; b b and b' b' are the jaws of single-throw switches (single pole); 9 P are the ter minals of the pressure coil of the wattmeter; s s the terminals of the series coil; A an ammeter, and V a voltmeter. Before taking a reading the single-pole switches should, of course, be closed. In order to take readings on left-hand circuit, throw the triple-pole switch to jaws a a a, and open the single-pole switch b b. Take readings and close switch b b. To take readings on right-hand side, throw the triple-pole switch to jaws a' a' a' and open the single-pole switch b' b' and take readings. Three-Phase Circuit.s.--In order to measure the power in a three-phase circuit, the following connections can be used (Fig. 4). In this case the total true watts are the sum of the two wattmeter readings. If the power factor is less than 50 per cent., the readings of one of the wattmeters will be negative. The connections to this meter (either the series or the pressure connections) will have to be...show more

Product details

  • Paperback | 508 pages
  • 189 x 246 x 26mm | 898g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236818032
  • 9781236818034