Transactions of the American Institute of Electrical Engineers Volume N . 23

Transactions of the American Institute of Electrical Engineers Volume N . 23

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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. 1905 edition. Excerpt: ...the synchronous converters. While operating the three 550-volt synchronous converters from the same bank of transformers it was necessary to use great care in adjusting their field rheostats so as to keep the load equally divided among the synchronous converters. If one synchronous converter was given a weak field and the other two a strong field, pumping would commence and soon become serious if the proper adjustment were not made. We had all three synchronous converters thrown out of synchronism several times from improper adjustment of their field currents. While operating under this condition it was found that a dirty commutator or too much oil applied to a commutator for the purpose of lubrication would cause serious trouble, and on one or two occasions threw all machines out of synchronism. Shifting the brushes to find the neutral point was also a prolific source of trouble. After these causes of trouble had been discovered we got fairly good results, but only by the most careful attention to the machines. Experience with these rotaries operating from one bank of transformers leads the writer to believe that a worse combination cannot be had, and is something that should never be done except as a makeshift. After running under this condition for two months a separate bank of transformers was installed for each synchronous converter, each bank consisting of two 300-kw. transformers, transforming from 2200 to 340 volts, tiiese transformers in turn being connected to a single bank, transforming from 30 000 to 2200 volts, both transformations being made on the Scott two-phase to three-phase system. This change in no way affected the results of an attempt to operate on a single transmission line, but the troubles experienced from operating more

Product details

  • Paperback | 210 pages
  • 189 x 246 x 11mm | 386g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236640586
  • 9781236640581