Western Electrician Volume 35

Western Electrician Volume 35

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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. 1904 edition. Excerpt: ...today used by the manufacturers for the insulation of coils and other portions of electrical machinery were actually subjected for periods up to nine months to a steady temperature of 150 C. without either electrical or mechanical deterioration. It has also been shown that the maximum temperature reached by the hottest part of the coils that are nowadays used can never reach a point more than 25 in excess of the average temperature of the coil obtained by percentage rise in the electrical resistance of the copper of the coil itself. It appears, therefore, that these materials may be exposed for great lengths of time to a temperature which when measured by rise in electrical resistance may be as high as 125 C., which corresponds to somewhat less than 150 C. at the hottest part of the coil. Our committee found that inanufacturers and users both attach great importance to clear standard definitions of what is meant by continuous and interinit--tent running. As regards the former, as it was generally admitted that the coils and hottest parts of generators and motors of modern type up to 100 kilowatts usually attain their maximum temperature within the limits of a six-hour full-load run, it was decided that a six-hour run should stand for the definition of continuous working; but as regards intermittent running, more especially in regard to crane and lift motors which work for short periods and stand so that their coils may cool down during the much longer periods between each rim, it was found very diflicult to settle on a simple and clearly understood definition of interniittency. Many firms and users considered that the only definition of intermittent running would be that the iiitermittency should be defined by the customer, who should lay...show more

Product details

  • Paperback | 1022 pages
  • 189 x 246 x 51mm | 1,783g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236819853
  • 9781236819857