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A Laboratory Manual of Alternating Currents

A Laboratory Manual of Alternating Currents


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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. 1912 Excerpt: ...(If an incandescent lamp load is used a wattmeter is not needed. If arcs are used for load, a wattmeter will be necessary.) A potential transformer will probably be necessary for the voltmeter on the secondary circuit. After adjusting the counterweights so that rated current flows in secondary at full load, vary the load from zero to full load in about eight steps, reading all instruments and height of secondary coil. Take two other runs, with the secondary underbalanced and overbalanced, to see how the transformer will regulate for other than rated current. Only secondary-current, position and secondary E.M.F. need be read for these two tests. Construct a vector diagram of the E.M.F.'s in the two circuits for 0, J, 5,1 and full load on secondary. Construct curves (with watts load as abscissse) of efficiency, power factor, secondary E.M.F. and secondary current and position of secondary coil. On another sheet plot the curves of secondary current and position for the two conditions of incorrect counterbalancing. How will the different losses in such a transformer vary with the load and why? As the transformer efficiency is not very high and the power factor is very low at low values of secondary voltage, it is customary to use, on commercial circuits, transformers having several taps on the secondary coil, so that the transformer may be operated at high power factor on different circuits, having different numbers of lamps; the low voltage tap is used for a circuit having few lamps, etc. EXPERIMENT XXIII. PARALLEL OPERATION OF TWO CONSTANT-POTENTIAL TRANSFORMERS. The conditions which affect the parallel operation of alternators, i.e., wave form, equality of voltage and phase, are also present to affect the operation of two transformers in parallel. In the cas...


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Product Details
  • ISBN-13: 9781151490834
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 70
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1151490830
  • Publisher Date: 09 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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