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Theory and Operation of Direct-Current Machinery

Theory and Operation of Direct-Current Machinery


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...same current and there is no current flowing to or from the generators through the neutral, the load is said to be balanced. It will be noted from the above that in order to have a balanced load it is not necessary to have the lamps of the same rating, neither is it necessary to have the same number of lamps on each side of the neutral; the only requirement being that the lamps in operation on each side of the neutral take the same current. Unbalanced Load.--It can not be expected that a balanced load, such as has been described above, will always exist, in fact, it seldom exists. In case the load is unbalanced, that is, equal currents are not required by the lamps on each side of the neutral, the neutral will carry the difference in currents. In Fig. 103 if only lamp 1 is turned on, the current will flow out through the upper wire and back to the generator through the neutral. If only lamp 2 is turned on the current will flow out through the neutral and back to the generator through the lower wire. In the first case, only generator A will be supplying current, and in the second case, only generator B will be supplying current. In Fig. 104 if lamps Nos. 1, 2, and 3 each requiring 1 ampere are turned on, 2 amperes will flow to the lamps through the upper wire; the current will then divide and go through lamps 1 and 3 and will come together again at E where it will again divide, half of it going to lamp 2 and the other half returning through the neutral to the generator. 110. Voltage Drop in Three-wire Systems.--The voltage at the lamps in a three-wire system is not the same as at the generators. When the load is balanced, there is a voltage drop in the two outside conductors and the pressure across both lamps is diminished by this voltage drop. The pressures...


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Product Details
  • ISBN-13: 9781159648961
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 74
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1159648964
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 150 gr


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