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American Institute of Electrical Engineers, Proceedings of the

Issue 1 • Date Jan. 1911

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Displaying Results 1 - 23 of 23
  • Indes to volume

    Page(s): i - viii
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  • Index of subjects

    Page(s): i - vii
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  • Index of authors

    Page(s): vii - viii
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  • Institute meeting at Boston February 17, 1911

    Page(s): 1 - 2
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  • Institute meeting in New York December 9, 1910

    Page(s): 2 - 3
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  • Directors' meeting, December 9, 1910

    Page(s): 3
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  • Membership

    Page(s): 3 - 9
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  • Some fundamental principles of power plant design

    Page(s): 10
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  • The Necaxa development of the Mexican light and power company

    Page(s): 11
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  • Inventors' guild

    Page(s): 11 - 12
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  • Past section meetings

    Page(s): 12 - 18
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  • Past branch meetings

    Page(s): 18 - 22
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  • Personal

    Page(s): 22 - 25
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  • Library accession

    Page(s): 25 - 26
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  • Officers and Board of Directors, 1910–1911

    Page(s): 27 - 32
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  • Open atmosphere and dry transformer oil as high-voltage insulators

    Page(s): 1 - 76
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    I. Cause of the Great Dielectric Strength of Air Films on the Surface of a Conductor at High-potential a. By the method that employs a conductor of circular section mounted in the air at the center of a hollow conducting cylinder, the electric stresses at the conductor surface required to start corona were observed and reported to the Institute.∗ These observations are recharted, using kilovolts per inch, in lieu of coulombs per inch-cube, for the stresses, so as to locate the single curve, drawn in Figs. 1a and 1b. These data apply to the normal indoor atmosphere at a temperature of 70 deg. fahr., barometer of 29.5 in. (750 mm.) and an elevation of 850 ft. (259 m.) above sea level. The galvanized sheet iron cylinder was new and clean, 3 ft. (91.4 cm.) long, 15 in. (38 cm.) diameter and open at both ends. Approximate sine-wave, 133-cycle, high-voltage alternating e.m.fs. applied the electric stresses between the conductors and the cylinder. The maximum values of these e.m.fs. were checked by needle spark-gaps. The conductors were clean brass rods for the one quarter inch (6.35 mm.) and larger diameters, and clean copper wires for the smaller diameters. The work was done indoors and at night to facilitate visual observation of the complete corona-start. The size of the room employed was approximately 40 by 40 by 15 ft. (12.2 by 12.2 by 4.5 m.), and the air in it reasonably dust free due to ordinary settling. The ions and radioactivity present in the air were not observed because their existence and importance in corona formation were not understood at the time. View full abstract»

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  • High-voltage line loss tests made on the 100-kilovolt 60-cycle 180-mile transmission line of the Central Colorado power company

    Page(s): 77 - 85
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    Somewhat over a year ago, Mr. West then assistant general manager and now general manager of the Central Colorado Power Co. made a careful series of high-voltage line loss, wave-distortion and charging-current tests. He gave the writer copies of the results of these tests at the time they were obtained because of the wish on the part of the latter to make a study of the fundamental principles of their highly interesting characteristics. Mr. West has consented to the publication of the data referred to above in the following charts: View full abstract»

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  • Design, construction and test of an artificial transmission line

    Page(s): 87 - 98
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    A little over a year ago Dr. Steinmetz suggested the construction of an artificial transmission line or “slow-speed conductor” in the Electrical Laboratory at Union College. It was proposed to duplicate or reproduce as nearly as possible the conditions of a high-voltage long-distance transmission line in the laboratory in such a way that the various phenomena connected with a line of this sort might easily be investigated. It was not desired particularly to study the effects of very high voltage but rather to investigate and study the various transient and other phenomena in connection with switching, sudden change of load, etc. View full abstract»

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  • Tests of losses on high tension lines

    Page(s): 99 - 117
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    It is generally admitted that corona losses constitute the most serious objection to the use of higher voltages in transmission lines. For this reason a number of physicists and engineers have devoted and are devoting their attention to the study of corona phenomena. Their investigations can be divided into two classes. View full abstract»

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  • The temperature gradient in oil immersed transformers

    Page(s): 119 - 138
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    High temperatures are objectionable in transformers for several reasons. The first of these is their effect on the insulating materials, which are subject to gradual deterioration at temperatures of about 100 deg. cent. and to rapid destruction at temperatures greatly in excess of that figure. A second reason, which is not nearly so important, but nevertheless a valid objection, is their effect upon copper loss, which increases about 10 per cent with an increase of 25 deg. cent. in the temperature. Another reason, with oil-insulated transformers, lies in the effect of high temperatures upon some oils, in the deposition of solid hydrocarbons. This forms a coating on the surface of the coils and core, and clogs the ducts, thus increasing the temperature in the windings. The temperature at which this process begins depends upon the character of the oil used. A fourth objection to high temperatures existed formerly in the aging effect of temperatures exceeding about 70 deg. cent. upon the iron used in the core, thus increasing the core loss. This objection does not exist in connection with the present improved steel, which is non-aging. View full abstract»

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  • Hysteresis and eddy current exponents for silicon steel

    Page(s): 139 - 141
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    It is my intention to bring before the Institute as briefly as may be, the apparent changes in general direction of curves required for predetermining core losses of apparatus, especially transformers, in which silicon steel is used. View full abstract»

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  • Commercial problems of transformer design

    Page(s): 143 - 147
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    One of the most important problems confronting a designing engineer is the compromise between the design which, in his opinion, is best but too expensive for competition, and the design which can be built to barely meet guarantees and which can be sold for the lowest possible price. The designing engineer is at times compelled to cater to the idiosyncrasies of certain customers, whose special requirements, experience has proved, are unnecessary and detrimental to good construction, but which will be furnished by competitors who are less conscientious in this respect. View full abstract»

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Aims & Scope

This Magazine ceased publication in 1919. The current retitled publication is IEEE Spectrum.

Full Aims & Scope