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Transactions of the American Institute of Electrical Engineers

Volume 50: 1931

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Displaying Results 1 - 25 of 72
  • Index of authors

    Publication Year: 1931, Page(s): 387
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  • Discussion

    Publication Year: 1931, Page(s): 386
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  • The Application of Hydrogen Cooling to Turbine Generators

    Publication Year: 1931, Page(s):381 - 386
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2878 KB)

    Hydrogen has many advantages over air when used as a cooling medium for rotating machines such as reduction of windage losses, increase in available output for a given amount of active materials and the absence of corona effects on the insulation in high-voltage machines. The paper describes a liquid sealing gland developed for use with turbine generators to prevent escape of gas along the shafts.... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s):379 - 380
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  • The Ohio Falls Hydroelectric Station at Louisville, Kentucky

    Publication Year: 1931, Page(s):370 - 379
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    This paper is a description of the Ohio Falls Hydroelectric Station at Louisville, Ky. The development is a low-head, run-of-river plant and a combined navigation and power dam. The dam is a part of the U. S. Government Ohio River canalization project. Eight units, with a total installed capacity of 105,000 hp. operate on a maximum head of 37 ft. and deliver power to the systems of the Louisville ... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s):367 - 369
    Cited by:  Papers (1)
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  • Governor Performance During System Disturbances

    Publication Year: 1931, Page(s):354 - 367
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3870 KB)

    This paper describes short-circuit tests which were made on a large power system under normal load conditions, in order to ascertain the operating characteristics of the system and the turbine governors during system disturbances. The introduction gives a brief description of the main features of the station and the connected System, a statement of the tests, and a list of the major conclusions. P... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s):352 - 353
    Cited by:  Papers (1)
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  • Power Transformer Noise Its Characteristics and Reduction

    Publication Year: 1931, Page(s):347 - 352
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1185 KB)

    Audibility characteristics of the ear and the units used for measuring noise are briefly discussed. A theoretical investigation was made to determine the different force components and other causes of transformer hum. Surface vibration measurements were made on transformer parts to determine the sources which cause noise in transformers and how these noise sources are afected by variations in oper... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s):342 - 346
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  • Theory of Abnormal Line-to-Neutral Transformer Voltages

    Publication Year: 1931, Page(s):328 - 342
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3386 KB)

    The abnormal voltages considered here are due to the occurrence of a large harmonic of fractional, even, or odd frequency in the line-to-neutral voltages of certain Y-connected transformer circuits. These phenomena were first described before the Institute in 1915, and other papers on the same subject have appeared since. The results of a detailed study of the instantaneous currents, voltages, and... View full abstract»

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  • Physical Nature of Neutral Instability

    Publication Year: 1931, Page(s):317 - 327
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7693 KB)

    Experience has established the fact that the neutral of a three-phase system may become subject to certain strange phenomena of instability under apparently normal conditions. The disturbances are of two distinct classes: (1) persistent shift or inversion of the neutral, resulting in unequal leg voltages; and, (2) persistent oscillation of the neutral (with equal effective voltage in all three leg... View full abstract»

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  • Experiences with Grounded-Neutral, Y-Connected Potential Transformers on Ungrounded Systems

    Publication Year: 1931, Page(s):299 - 316
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (13077 KB)

    The application of Y-connected transformers to three-phase, three-wire systems, in such a manner that the third and its multiple harmonics of the exciting currents would ordinarily be suppressed, is not in accordance with the best practise. However, such applications of grounded-neutral, Y-connected potential transformers, particularly to temporarily ungrounded systems, have been made for relaying... View full abstract»

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  • Lighting Airway Beacons Direct From High-Voltage Transmission Lines

    Publication Year: 1931, Page(s):294 - 298
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2061 KB)

    Airway beacons requiring from 1??2 to 2?? kw., may be lighted direct from low-voltage distribution lines, gas engine-driven generators or from high-voltage transmission lines. The latter requires a high potential transformer of very small capacity, although most standard high potential transformers are made only in ratings of 15 to 100 kv-a. The ``capacitap'' is a potentiometer device similar to t... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s): 293
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  • Operating Experience With Reactance Type Distance Relays

    Publication Year: 1931, Page(s):288 - 293
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1254 KB)

    In view of the fact that reactance type distance relays have been in service in this country less than a year, operating experience should be of general interest to the industry at this time. This paper presents the performance record during the 1930 lightning season of two new types of reactance relays. One of these types is a high-speed American built relay, using a stepped time-distance charact... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s): 287
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  • Lightning Investigation at Alcoa, Tenn.

    Publication Year: 1931, Page(s):284 - 287
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2711 KB)

    The cooperative lightning laboratories near Alcoa, Tenn., have been in operation since July, 1928. This paper outlines the purpose of the installation and describes the transmission line on which the studies are being conducted. A background is provided for a more complete appreciation of the technical data which appear from time to time. Conclusions drawn from an operating viewpoint are presented... View full abstract»

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  • Progress in the Design of the Single-Phase Series Motor

    Publication Year: 1931, Page(s):278 - 283
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1277 KB)

    The paper deals with the development of the design of the single-phase series motor and some of the main features in both electrical and mechanical proportions which determine the service capacity in the application of this type of motor to railway electrification. Intensive study and development begun in the early part of 1927 resulted in the production of a singe-phase series motor with more tha... View full abstract»

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  • Electric Power in the Lumber Industry

    Publication Year: 1931, Page(s):273 - 277
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    In the preparation of this article an attempt has been made to show the development or growth of the use of electric power transmission in the lumber industry. More particularly in that branch of the industry that is engaged in falling trees, hauling them to the mill and sawing these trees into lumber units of the size used by builders and manufacturers of finished articles in which wood is the ra... View full abstract»

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  • A Cooperative Electrolysis Survey in Louisville, Kentucky

    Publication Year: 1931, Page(s):269 - 272
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    A cooperative electrolysis survey in the city of Louisville, Kentucky, under the direction of an electrolysis committee is described. An analysis of a portion of the survey data and indicated mitigation measures are given as typical examples. The advantages of cooperative action in a general electrolysis survey are shown. View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s): 268
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  • The Modern Single-Phase Motor for Railroad Electrification

    Publication Year: 1931, Page(s):263 - 268
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2714 KB)

    The past three years have seen a great increase of activity in the field of alternating current electrification of steam railroads and, consequently, much attention has been given to the design of the single-phase traction motors upon which the success of this type of electrification chiefly depends. The object of this paper is to describe the up-to-date motors which have been developed to meet th... View full abstract»

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  • Discussion

    Publication Year: 1931, Page(s): 262
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  • Initiation of an Electrification Into Operation

    Publication Year: 1931, Page(s):259 - 262
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    This paper describes the energizing and putting into service of the Pennsylvania electrification project. The normal and desirable procedure of placing an electrification into service is cited, and the departure from it brought about by the difficulties encountered in actual railway operation are explained. The operating practise??functions of the power director, his assistants, substation operato... View full abstract»

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