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Transactions of the American Institute of Electrical Engineers

Jan. 1925

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Displaying Results 1 - 25 of 114
  • Transactions of the American Institute of Electrical Engineers

    Publication Year: 1925, Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1925, Page(s): nil2
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    Freely Available from IEEE
  • Preface

    Publication Year: 1925, Page(s): nil3
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    Freely Available from IEEE
  • Power-Factor Correction

    Publication Year: 1925, Page(s):1 - 7
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1768 KB)

    Power-factor correction has become a commercial problem of major importance, and technical knowledge and corrective equipment are available to make correction a part of the activities of the electrical industry. Field studies on several properties show power-factor correction can be obtained without difficulty. Conditions can be improved by requiring all new business to be installed for high power... View full abstract»

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  • A New Alternating-Current General-Purpose Motor

    Publication Year: 1925, Page(s):7 - 39
    Cited by:  Papers (1)
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  • The Single-Phase Induction Motor

    Publication Year: 1925, Page(s):40 - 52
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2235 KB)

    The operation of the single-phase induction motor is presented according to the cross-field theory as distinguished from the theory of oppositely rotating fields. The mathematics used require only a knowledge of algebra and trigonometry and no factors, such as cross-field iron loss and cross-field magnetizing current, are neglected. In addition to the derivation of the vector diagram, its transfor... View full abstract»

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  • Effect of Full Voltage Starting on the Windings of Squirrel-Cage Induction Motors

    Publication Year: 1925, Page(s):53 - 63
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6246 KB)

    This paper discusses the effect on the windings when starting squirrel-cage induction motors withfull voltage. The data is presented in four groups: namely, (1) Special tests made with a vibrograph instrument on a 50-h. p. and a 500-h. p. induction motor: (2) Observation tests made on a number of motors when starting with full voltage: (3) The condition of some windings which failed in service: (4... View full abstract»

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  • Another New Self-Excited Synchronous Induction Motor

    Publication Year: 1925, Page(s):64 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1815 KB)

    One form of self-excited synchronous induction motor was described by the same author in a paper presented at the Spring Convention of the A. I. E. E., Birmingham, Ala., the present contribution describes a second form of such a motor. The starting, synchronizing, synchronous load and asynchronous overload periods are analyzed with special reference to the synchronizing torque, the automatic compo... View full abstract»

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  • Artificial Representation of Power Systems

    Publication Year: 1925, Page(s):72 - 79
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3647 KB)

    The size and complexity of present-day power systems have increased to the point where the prediction of the behavior of the system by analytical methods is more and more difficult. The solution of commercial networks by Kirchhoff's Laws or by cut and try methods, even with the help of star-delta transformations, leads to such involved equations that the need for simpler methods is keenly felt. In... View full abstract»

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  • Power System Transients

    Publication Year: 1925, Page(s):80 - 103
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7452 KB)

    The steady state load limits of a power network may be examined by familiar methods of analysis. However, the instability of a system with one or more elements working close to these limits sets lower values of power at which the system can be expected to give satisfactory operation under the sudden changes in load or connections which it must successfully sustain in operation. This paper presents... View full abstract»

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  • Testing High-Tension Impregnated Paper-Insulated, Lead-Covered Cable

    Publication Year: 1925, Page(s):104 - 129
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9649 KB)

    The increase in voltage rating of cables has necessitated that the tests to assure satisfactory cable be more adequate than as standardized at present. This has resulted in an intensive study of the tests previously standardized, development of new tests, and the design and manufacture of suitable testing equipment to meet the new testing requirements. Measurements are made upon cables to determin... View full abstract»

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  • Predicting Central Station Demand and Output

    Publication Year: 1925, Page(s):130 - 136
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1376 KB)

    For relatively long-term predictions of central station demand and output, of the order of one year or more, the use of constant (or approximately constant) yearly percentages of growth is common and well understood. This method is frequently applied by straight, or nearly straight, line projection of the plot of past data on semi-logarithmic paper. When the term of the prediction is less than one... View full abstract»

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  • The Thermal Time Constants of Dynamo-Electric Machines

    Publication Year: 1925, Page(s):137 - 154
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4124 KB)

    Considering the thermal behavior of a dynamo-electric machine intended for continuous service, its acceptance tests require, at present, only a limiting temperature elevation under a continuous rated load. For the intelligent operation of a machine after it has been put in service, additional information is desirable concerning its thermal behavior under changes of load. This subsidiary thermal in... View full abstract»

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  • Squirrel-Cage Induction-Motor Core Losses

    Publication Year: 1925, Page(s):155 - 163
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2539 KB)

    An experimental method is presented for segregating the various no-load losses of a squirrel-cage induction motor. It is shown that for insulated rotor bars the losses consist principally of stator fundamental-frequency losses, rotor surface losses and eddy-current losses in the rotor bars due to radial and tangential slot-leakage fluxes in the rotor slots caused by reluctance pulsations in the ai... View full abstract»

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  • Complete Synchronous Motor Excitation Characteristics

    Publication Year: 1925, Page(s):164 - 171
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1858 KB)

    Synchronous motor excitation characteristics published hitherto have been incomplete. If theoretically determined, while forming closed loops, some doubt as to their accuracy has been entertained. When determined experimentally, thay have not been complete, in that the so-called unstable portions of the curves have not been obtained, and generally speaking, the upper portions of the characteristic... View full abstract»

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  • Factors Affecting the Design of D-C. Motors for Locomotives

    Publication Year: 1925, Page(s):172 - 183
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3481 KB)

    The designer of motors for locomotive service is confronted with at least two limitations; space and weight. For large locomotives, the second limitation may not be of prime importance, but the first must be constantly in the mind of the designer. The paper gives a comparison between different types of motor mounting as regards the amount of power which may be developed in the available space with... View full abstract»

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  • A Study of Direct-Current Corona in Various Gases

    Publication Year: 1925, Page(s):184 - 192
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1769 KB)

    1. The critical corona intensities have been determined for helium, hydrogen, oxygen, nitrogen, air, and carbon dioxide for pressures ranging from 2 to 760 mm. 2. In each case the relattion E/P = A + B/??/P was found to hold approximately for pressures above 4 cm. 3. The values found for air agree well with those found by Whitehead and Isshiki from their investigation of alternating-current corona... View full abstract»

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  • Dielectric Properties of Fibrous Insulation As Affected by Repeated Voltage Application

    Publication Year: 1925, Page(s):193 - 210
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5453 KB)

    It is believed by many that the most plausible explanation of fibrous insulation failure is the pyro-electric theory. Under this theory as elaborated by Steinmetz, Wagner and others, insulation under stress is heated by the transformation of electric energy to thermal energy. Insulations are considered as of the nature of poor conductors and subject to the same characteristics. The transformation ... View full abstract»

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  • Corona in Oil

    Publication Year: 1925, Page(s):211 - 216
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1285 KB)

    Experiments were made to determine certain effects of high local voltage stresses in transformer oil. The resistivity of the oil was measured by a special method immediately following a period of voltage stress. The results were: 1. A greatly reduced resistivity when the stressing voltage was greater than that producing visible corona. 2. A gradual increase in resistivity following removal of stre... View full abstract»

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  • Mechanical Stresses in Busbar Supports During Short Circuits

    Publication Year: 1925, Page(s):217 - 237
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5264 KB)

    With the increased magnitudes of short-circuit current obtained in modern busbar circuits, it becomes a matter of great importance to determine the mechanical stresses imposed on busbar supports during short circuits. The stresses are due to the electromagnetic force produced by the current flowing in adjacent conductors in the bus structure. When usefully applied, the electromagnetic force propel... View full abstract»

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  • Electrical Measurement of Physical Values The Determination by Electrical and Magnetic Means of Quantities not in Themselves of an Electrical Nature

    Publication Year: 1925, Page(s):238 - 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8690 KB)

    This paper was prepared under instructions from the Committee on Instruments and Measurements, with a view to forming a basis for the Committee's work in connection with electrical measurements as applied outside of the strictly electrical field. The system of classification used is in accordance with the nature of the quantity under measurement, rather than with the principle involved; and the su... View full abstract»

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  • Use of an Oscillograph in Mechanical Measurements

    Publication Year: 1925, Page(s):264 - 274
    Cited by:  Papers (2)
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  • Temperature Errors in Induction Watthour Meters An Analysis and the Development of a Temperature-Sensitive Magnetic Material Suitable for Compensation

    Publication Year: 1925, Page(s):275 - 287
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3007 KB)

    This paper is presented in two principal divisions, Part I and Part II. The first deals with the general problem of small errors dute to temperature changes in watthour meters and describes methods of segregating the various components of these errors. It is shown that they may be divided into two principal groups, termed Class 1 and Class 2. Class 1 errors are operative at all power factors and a... View full abstract»

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  • Storage Battery Electrolytes

    Publication Year: 1925, Page(s):288 - 293
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1472 KB)

    Experimtents have been int progress at the Bureau of Standards to determine quantitatively the effect produced by a wide variety of impurities on the rate of sulphation of storage battery plates. The method for making the determinations involves measuring the changing weight of the plates suspended in the solution. The various impurities are classified according as they affect the negative plates,... View full abstract»

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  • The Theory of Probability and Some Applications to Engineering Problems

    Publication Year: 1925, Page(s):294 - 301
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1838 KB)

    The purpose of this paper is to encourage a wider recognition by engineers of a body of principles which in its mathematical form is a powerful instrument for the solution of practical problems. Some subjects in which the theory of probability has been used are recalled, the fundamental principles are stated and applied to three problems chosen from the field of telephone engineering. View full abstract»

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