Proceedings of the Institution of Electrical Engineers Volume 50

Proceedings of the Institution of Electrical Engineers Volume 50

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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. 1913 edition. Excerpt: leading kilovolt-amperes. The right characteristic to get is the one shown, and that is quite easily obtained with a phase advancer provided with a field winding. When the motor is running light it is feeding a leading current of a certain amount. Perhaps an 8oo-h.p. motor could feed 300 k.v.a. leading into the mains, neutralizing the bad power factor of other motors in the vicinity; and as the load comes on (notwithstanding that the leading current increases slightly) the power factor becomes nearly unity. That characteristic is, I think, one that is to be aimed at in many cases, and it can be easily obtained by means of the right phase advancer, either of the Scherbius type or the British Westinghouse type. With regard to Mr. Ashton's remarks about condensers, I am very glad to hear that condensers can be built so cheaply, and that they can give such a good performance. He must not suppose for a moment that I am sorry to hear that he is in competition. I think there is room for everybody to deal with the question of the improvement of the power factor. He says that for a 5o-cycle circuit we can buy condensers at 2'8 per k.v.a. I think he must be taking the theoretical price at which they ought to be supplied. On the other hand he puts the price of a 3o-k.v.a. machine running at 490 revs. per minute at 250, surely a very high price. It is more than sufficient to cover the cost of the advancer and 60 per cent more copper in the rotor circuit (a matter of $$), which if put in would make the total losses in the motor some 20 per cent less than they are without the phase advancer. If this extra copper were added (and one is never pinched for room for copper in the rotor in the design of an induction motor) the saving in the...
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Product details

  • Paperback | 314 pages
  • 189 x 246 x 17mm | 562g
  • United States
  • English
  • black & white illustrations
  • 1236855590
  • 9781236855596