Download book Transactions of the American Institute of Electrical Engineers Volume 39, PT. 2

Transactions of the American Institute of Electrical Engineers Volume 39, PT. 2. American Institute of Engineers

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Author: American Institute of Engineers
Page Count: 292 pages
Published Date: 19 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781236222992
File size: 29 Mb
File Name: Transactions.of.the.American.Institute.of.Electrical.Engineers.Volume.39,.PT..2.pdf
Download Link: Transactions of the American Institute of Electrical Engineers Volume 39, PT. 2
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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. 1920 Excerpt: ... curve, so that good stability is obtained. But when the alternator excitation is controlled by varying the exciter voltage, the factors of voltage range and stability require consideration. In alternators of modern design the range of exciting current required at unity power factor is approximately 14 to one; and about two to one at 80 per cent, power factor. This means a range in exciting voltage of about to one at 80 per cent power factor; and in more exceptional cases the range in exciting voltage may reach three to one. A still greater range in exciting voltage may be required by generators or synchronous condensers which have to supply charging currents to transmission lines at light load. Here a range in exciting voltage down to the residual voltage of the exciter may be required. Standard regulators of the Tirril type are usually arranged for a voltage range of two to one or 2 Yi to one. This is the range over which the d-c. control magnet and the rheostat shunting relays function properly. If the regulator has an a-c. vibrating magnet in place of the d-c. control magnet, and a source other than the exciter is available for energizing the shunting relays, the range over which the regulator is operative extends down to residual voltage. Attention should be given to the performance of the exciter over a range somewhat exceeding that for which the regulator is designed. When operating near the "full field" or maximum voltage point of the exciter, the time during which the field rheostat is cut in is very small compared to the time during which it is short-circuited. This means that the shunting relays are open a very small proportion of the time, and unsatisfactory operation is the result. As a consequence it is the practise to leave a certai...

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