Transactions of the American Institute of Electrical Engineers

Jan. 1927

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  • Transactions of the American Institute of Electrical Engineers

    Publication Year: 1927, Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1927, Page(s): nil2
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  • Preface

    Publication Year: 1927, Page(s): nil3
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  • Synchronous Machines-III Torque-Angle Characteristics Under Transient Conditions

    Publication Year: 1927, Page(s):1 - 18
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3559 KB)

    This is the third part of a series of papers on the subject of synchronous machines. The first two were: I. An Extension of Blondel's Two-Reaction Theory, II. Steady State Power-Angle Characteristics. The present paper deals with the power-angle, or torque-angle, characteristics under transient conditions, namely, A. Cyclic variation of impressed torque, B. Sudden angular displacement, C. Synchron... View full abstract»

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  • The M. M. F. Wave of Polyphase Windings With Special Reference to Sub-Synchronous Harmonics

    Publication Year: 1927, Page(s):19 - 29
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2069 KB)

    The m. m. f. waves of fractional slot windings or other irregular windings are found to contain harmonic components having wavelengths greater than two pole pitches. These are designated as sub-synchronous harmonics since their harmonic order is lower than that of the synchronously rotating wave. They induce currents in the damper windings of synchronous machines which may produce noticeable loss.... View full abstract»

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  • Transverse Reaction in Synchronous Machines

    Publication Year: 1927, Page(s):30 - 38
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2362 KB)

    The confusion existing at present in the theory of synchronous machines is shown to be due to insufficient experimental evidence of the behavior of this type of machine under transverse magnetizing (cross magnetizing) conditions. A method of testing which yields the needed data is described. The results of these tests on a particular machine are given and analyzed. It is proved, for the machine te... View full abstract»

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  • Starting Performance of Synchronous Motors

    Publication Year: 1927, Page(s):39 - 59
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3790 KB)

    This paper deals with the theory underlying the starting performance of the salient-pole synchronous motor equipped with damper windings. The theory, while involving some approximations, is accurate enough for practical engineering calculations. Formulas are developed for the starting torque, pull-in torque and inrush. A method is also given for calculating the speed torque curve from stand still ... View full abstract»

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  • The Synchronous Converter Theory and Calculations

    Publication Year: 1927, Page(s):60 - 76
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2921 KB)

    The first part of this paper is devoted to the purpose of presenting a clear conception of the internal voltages, currents, heating, and armature reactions as related to the physical structure of the simple converter and as related to the passage of time. These may be styled ``space'' and ``time'' relations. ``Space'' relations are indicated by means of diagrams representing as nearly as possible ... View full abstract»

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  • Constant-Current Regulating Transformer Characteristics Special Tests Show Radical Differences From Conventional Assumptions

    Publication Year: 1927, Page(s):77 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2503 KB)

    It has generally been assumed that the total losses of a constant-current regulating transformer remain practically constant for all loads. Performance and test calculations have accordingly heretofore been made according to well-known conventional methods from the segregated losses determined from test or design data, assuming total losses constant. Extensive tests described in the paper show, ho... View full abstract»

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  • Additional Losses of Synchronous Machines

    Publication Year: 1927, Page(s):84 - 100
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4847 KB)

    In the case of high-speed turbine generators, the cost reliable means of determining the losses under actual operating conditions is to measure the weight and temperature rise of the cooling medium and to estimate the small part of the losses which is dissipated from the frame to the surrounding medium. The temperature rise of the cooling medium can be obtained by means of temperature detectors lo... View full abstract»

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  • Reduction of Armature Copper Losses The Inverted Turn Transposition for the Reduction of Losses Due to Non-uniform Current Distribution in the Armature Conductors of Large A-C. Machines

    Publication Year: 1927, Page(s):101 - 111
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2762 KB)

    A new method of reduction of armature copper losses is described, which consists in the inversion of the conductors of a multi-turn barrel type coil at one or more places in the end portions of the coil. Previous writers have described methods of transposing the conductors in the slot and of carrying insulated strands through successive positions in successive coils, but the new method now describ... View full abstract»

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  • Graphical Determination of Magnetic Fields Theoretical Considerations

    Publication Year: 1927, Page(s):112 - 135
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3911 KB)

    Three papers on the general subject, ``Graphical Determination of Magnetic Fields,'' are being presented simultaneously to cover three phases of the subject: 1. Theoretical Considerations, 2. Comparison of Calculations and Tests, by E. E. Johnson and C. H. Green, 3. Practical Applications to Salient-Pole Synchronous Machine Design, by R. W. Wieseman. In the following paper, which is the first of t... View full abstract»

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  • Graphical Determination of Magnetic Fields Comparison of Calculations and Tests

    Publication Year: 1927, Page(s):136 - 140
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2189 KB)

    This paper, which deals with the experimental determination of magnetic fields, is presented as a verification of some of the results described by Messrs. A. R. Stevenson, Jr., and R. H. Park in a companion paper, ``Graphical Determination of Magnetic Fields??Theoretical Considerations,'' and to introduce new and convenient methods of determining the flux distributions in air spaces and in regions... View full abstract»

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  • Graphical Determination of Magnetic Fields Practical Applications to Salient-Pole Synchronous Machine Design

    Publication Year: 1927, Page(s):141 - 154
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5847 KB)

    There are three methods of obtaining the flux distribution in a magnetic field. First: By test. Templets or models can be made of the field to be explored and the flux distribution can be obtained by test as described in a companion paper ``Graphical Determination of Magnetic Fields??Comparison of Calculations and Tests'' by Messrs. E. E. Johnson and C. H. Green. Second: By mathematical analysis. ... View full abstract»

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  • Design of Reactances and Transformers Which Carry Direct Current

    Publication Year: 1927, Page(s):155 - 160
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1025 KB)

    It is usually necessary to place an air-gap in the core of a reactance or transformer which carries direct current in order to secure the greatest inductance. The work here reported points out a direct method of designing such reactances or transformers including the determination of the best value of the air-gap. View full abstract»

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  • Voltage Standardization of A-C. Systems From the Viewpoint of the Electrical Manufacturer

    Publication Year: 1927, Page(s):161 - 172
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2952 KB)

    In outlining the history of voltage standardization, it is observed that there has been separate standardization of voltages of various types of apparatus, rather than standardization of a complete operating system. The results of a questionnaire answered by 22 operating companies are analyzed and the conclusion is drawn that the use of the old standard transformer voltages involved, in many cases... View full abstract»

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  • Voltage Standardization From a Consulting Engineer's Point of View

    Publication Year: 1927, Page(s):172 - 174
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (617 KB)

    The author points out certain reasons why specifications for purchased equipment have not followed the manufacturers' existing standards and recommends certain changes in standards for system and apparatus voltages. The importance of having transformers interchangeable as step-up and step-down units is pointed out and, by means of five per cent taps above and below rated voltages in both windings,... View full abstract»

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  • Standardization of Voltage Ratings For Power Systems and Equipment

    Publication Year: 1927, Page(s):175 - 184
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2051 KB)

    This paper undertakes to analyze the voltage practises and requirements of alternating current power systems with the aim of arriving at voltage standards that adequately correct and extend present standards. Utilization, or receiving terminals, is taken as the point of reference and for designation of system, circuit, and equipment voltages. For this analysis and development of voltage standards ... View full abstract»

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  • Voltage Standards for Electrical Distribution

    Publication Year: 1927, Page(s):185 - 186
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    This paper discusses the necessity for standardizing voltages and advocates the utilization voltage as the most logical reference base. It suggests that the ratios adopted should be uniform at all voltages. It also proposes that there should be a recognized standard for transformers in which the direction of energy flow is subject to change. View full abstract»

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  • Voltage Standardization Its Relation to the Interconnected Power Companies of the Southeast

    Publication Year: 1927, Page(s):187 - 194
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1921 KB)

    Voltage standardization has long been recognized as desirable, and to date no definite standards have been accepted and applied. An attempt is now being made to coordinate the recommendations of the different power companies and manufacturers with a view towards adopting definite voltage standards for all apparatus. A proposal has recently been submitted by the manufacturers which is not applicabl... View full abstract»

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  • Suggested Transformer Voltage Standards Their Relationship to Pacific Coast Practise

    Publication Year: 1927, Page(s):195 - 199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1195 KB)

    Explanation of authorship and basis of paper. General discussion of the proposed system voltage standards and the principles underlying them. Listing of transformer voltages and kv-a. connected now in use by P. C. E. A. Companies. Detailed discussion of changes in proposed standards to bring them into conformity with Pacific Coast practise. Summary and conclusion. View full abstract»

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  • Voltage Standardization

    Publication Year: 1927, Page(s):199 - 215
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4670 KB)

    A review of the points of view which in general influence standardization of voltages and a number of proposals of certain standards are given in this paper. The discussion pertains to classes of voltages, three-phase systems, d-c. systems, and nominal voltages. A plea is made for the use of the ratio of 1/ ??3 for working voltages. View full abstract»

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  • Combined Light and Power Systems For A-C. Secondary Networks

    Publication Year: 1927, Page(s):216 - 239
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5909 KB)

    If the situation being created by the extensive use of combined light and power systems for secondary distribution is to be squarely met, widespread discussion is necessary. The increase of alternating-current low-voltage network systems employing automatic sectionalizing equipment has been very rapid. This move has been attended by a diversity of choice of combined light and power schemes for the... View full abstract»

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  • A New 132,000-Volt Cable Joint

    Publication Year: 1927, Page(s):240 - 247
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2945 KB)

    This paper describes what is believed to be a new form of high-voltage joint. The main novelties in the joint are that the metallic union of the conductors is insulated by wrapping on a single sheet of wide, impregnated paper by machine. The ends of the cable insulation are cut into a series of steps, or a taper, and knives on the machine cut the wide sheet of paper exactly to fit the steps or tap... View full abstract»

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  • Oil Breakdown at Large Spacings

    Publication Year: 1927, Page(s):248 - 259
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4470 KB)

    Much work has been done on the breakdown of insulating oil at small spacings between electrodes. Information for electrode separations of several inches is not as complete. It has been found that sources of ionization external to the gap influence the gap breakdown, so that the design of electrode supports and parts is of great importance. Data on several sizes of spherically terminated rods or cy... View full abstract»

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