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Transactions of the American Institute of Electrical Engineers

Jan. 1924

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  • Transactions of the American Institute of Electrical Engineers

    Publication Year: 1924, Page(s): nil1
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    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 1924, Page(s): nil2
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  • Preface

    Publication Year: 1924, Page(s): nil3
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  • Superpower Transmission Economies and Limitations of the Transmission System of Extraordinary Length

    Publication Year: 1924, Page(s):1 - 15
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3519 KB)

    This paper is a study of the transmission of very large blocks of power for extraordinary distances and has for its purpose the bringing out of the major operating characteristics of such a system, the characteristics which it possesses which are different from those of shorter transmissions and the duties imposed upon generators, transformers, synchronous condensers, switches, etc., primarily as ... View full abstract»

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  • Some Theoretical Considerations of Power Transmission

    Publication Year: 1924, Page(s):16 - 23
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1740 KB)

    The following points are developed in the paper: 1. A proof of the circle diagram maintaining therein the idea of the angle between the generator and receiver voltages. 2. It is shown how the characteristics of the synchronous condenser limit the maximum power that can be transmitted over a line. 3. The effect of character of load on stability. 4. Comparison of 500-mile straightaway line with 500-... View full abstract»

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  • Power Transmission

    Publication Year: 1924, Page(s):24 - 25
    Cited by:  Papers (3)
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  • Power Limitations of Transmission Systems

    Publication Year: 1924, Page(s):26 - 38
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2626 KB)

    Several independent studies have been made recently to determine the economies of a large, uniform power system. The two studies of more general interest were those conducted by the Department of the Interior, under the direction of W. S. Murray, for the Superpower Zone, and by F. G. Baum for the United States. Both of these investigations are available in published form. During the progress of th... View full abstract»

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  • Experimental Analysis of Stability and Power Limitations

    Publication Year: 1924, Page(s):39 - 58
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5443 KB)

    A method of determining the power and voltage stability limit of a transmission system taking into account the characteristics of the synchronous condenser and load in conjunction with the characteristics of the line is described. The power limit of a straight 500-mile transmission line is calculated by this method. The power limit is also calculated for the same line with a synchronous condenser ... View full abstract»

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  • The Limitations of Output of a Power System Involving Long Transmission Lines

    Publication Year: 1924, Page(s):59 - 103
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (12740 KB)

    The conditions of stability of a system are discussed and it is pointed out that while the various transmission line diagrams as used at present implicitly assume the terminal voltage at the two ends to be constant the degree of voltage regulation as determined by load conditions is an important factor in the determination of the limit of output. A type of combined diagram is proposed whereby this... View full abstract»

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  • Fortieth Anniversary Celebration of the A.I.E.E.

    Publication Year: 1924, Page(s):104 - 115
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    Freely Available from IEEE
  • Gaseous Ionization in Built-up Insulation---II

    Publication Year: 1924, Page(s):116 - 126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2878 KB)

    It has been suggested frequently that the failure of high-voltage armature bars might be due to deterioration caused by gaseous ionization in entrapped air spaces. In an earlier paper a series of tests on a number of 6600-voltage mica folium armature bars made up with different degrees of mica content was described. The variations of the dielectric losses with voltage and with temperature were stu... View full abstract»

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  • Overdamped Condenser Oscillations

    Publication Year: 1924, Page(s):126 - 130
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1387 KB)

    In the classical equations of the discharge of a condenser of capacity C into an external circuit of resistance r and inductance L, it is found that the discharge is oscillatory if r ≪ ??4L/C, and is impulsive if r ≫ ??4L/C. As the perfect condenser can never be realized in practise, it is the purpose of this paper to show the effect of the condenser leakage on the discharge wave. Th... View full abstract»

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  • Free Convection of Heat in Gases and Liquids-II

    Publication Year: 1924, Page(s):131 - 144
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2967 KB)

    The present paper is an extension of my earlier work which was found necessary in order to account for the observed convection for both large-and small temperature differences. General expressions are developed, by the method of dimensions, which enable us to calculate the convection from any system of similar bodies when the three undetermined constants K, m, and n have been experimentally determ... View full abstract»

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  • The Magnetic Properties of the Ternary Alloys Fe-Si-C

    Publication Year: 1924, Page(s):145 - 175
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8347 KB)

    The variations in the magnetic properties of iron and iron-alloys, even of supposedly constant composition, has been puzzling to the users and investigators of ferro-magnetic materials ever since the introduction of such materials for electrical apparatus. The author started to investigate this problem over ten years ago at the University of Illinois, and has continued it at the Westinghouse Resea... View full abstract»

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  • Alkali Vapor Detector Tubes

    Publication Year: 1924, Page(s):175 - 182
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    This paper describes unusual and very desirable results that are obtained on priming tungsten filament three-electrode vacuum tubes with an alloy of potassium and sodium when such tubes are used as detectors of radio frequency currents in receiving circuits. The method of preparing the tubes and of introducing the alloy is described in some detail. Data obtained for these alkali vapor tubes are sh... View full abstract»

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  • Transient Performance of Electric Elevators

    Publication Year: 1924, Page(s):183 - 198
    Cited by:  Papers (1)
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    The investigation of transient conditions is vitally important in elevator engineering, both electrical and mechanical. In no other method of human transportation are traveled distances so short and speeds and loads so frequently varied. Passengers mutst be hoisted and lowered safely and expeditiously. Landings must be accurately made. The elevator is consequently a machine that is very sensitive ... View full abstract»

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  • Variable Voltage Control Systems as Applied To Electric Elevators

    Publication Year: 1924, Page(s):199 - 219
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6762 KB)

    Low-speed electric elevators, using d-c. motors, came into use about 18.90. Later, a-c. motors were employed, but on account of the difficulty of speed control could not be used for the high speeds necessary in tall buildings. Since the height of buildings is dependent upon the elevator system, and in many districts only a-c. is available, the need for high-speed equipments that can be operated fr... View full abstract»

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  • A Novel Alternating-Current Voltmeter

    Publication Year: 1924, Page(s):220 - 223
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1562 KB)

    This paper describes an improved thermo-voltmeter, which may be used at all frequencies up to and including 1,000,000 cycles. This meter retains the usual high sensitivity of thermovoltmeters so that it requires a very small current??for full scale deflection about 2 milliamperes. At present it is made in ranges from 1 to 20 volts inclusive. Higher voltage ranges can be made but probably at the ex... View full abstract»

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  • Oscillographic Study of the Current and Voltage in a Permeameter Circuit

    Publication Year: 1924, Page(s):224 - 230
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    The purpose of the investigation was to study the form of the voltage-time and current-time curves, existing in a permeameter circuit, and to reduce the time required for the reversal of the magnetizing current. The permeameters used in the investigation were of the U-shaped yoke type. Oscillograms were taken of the current and of the induced voltage during the opening and also during the reversal... View full abstract»

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  • Power Plant Auxiliaries and Their Relation to Heat Balance

    Publication Year: 1924, Page(s):230 - 235
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1643 KB)

    In the larger central station steam plants, efforts to increase the over-all economy and ease of operation were responsible for the use of motor-driven auxiliaries receiving their power from auxiliary turbogenerators, called house turbines, the exhaust from which is used for heating feed water. This scheme is reliable and economical. It is handicapped by the fact that over a considerable range of ... View full abstract»

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  • Shaft Currents in Electric Machines

    Publication Year: 1924, Page(s):235 - 245
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5965 KB)

    This paper describes the causes of, and remedies for, the existence of ``shaft currents'' or ``bearing currents'' which sometimes flow across the rubbing surfaces of the bearings of electric machinery, thereby gradually damaging the shaft and bearings. Up to the present time the only cause of shaft currents that has attracted any particular attention has been the use of sectionalized stators, and ... View full abstract»

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  • Eddy Current Losses in Armature Conductors

    Publication Year: 1924, Page(s):246 - 251
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1329 KB)

    This paper is an extension to the author's paper in Vo. XXXIX Pages 997 to 1047 on Eddy Current Losses in Armature Conductors. In this present paper additional formulas are given for the cases where transposed coils are used and also methods given for quickly estimating the increased loss due to eddy currents. View full abstract»

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  • Tooth Pulsation in Rotating Machines

    Publication Year: 1924, Page(s):252 - 261
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2013 KB)

    1. An experimental method is presented of checking the magnitude of flux pulsations in the teeth of rotating machines where both members are slotted. The method consists in using metallic electrodes shaped like the teeth of a machine and an electrolyte or mercury to represent the air. Voltage is applied between the two members and the current through the tooth under consideration is measured. The ... View full abstract»

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  • Surface Iron Losses With Reference to Laminated Materials

    Publication Year: 1924, Page(s):262 - 281
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4564 KB)

    Surfaces or pole-face losses are assumed to be governed by ten factors and the influence of each on the resulting losses is considered. After reviewing the work of the previous investigators an account is given of some rather extensive tests recently completed by the writers. These tests cover results obtained on an experimental salient pole machine and an experimental 3-phase induction motor. Dat... View full abstract»

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  • Methods for Testing Current Transformers

    Publication Year: 1924, Page(s):282 - 297
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3928 KB)

    In the sale of electric power especially in large amounts at high voltages, current transformers are universally used to operate the meters from the readings of which the bills are made out. While the secondary currents of such transformers reproduce fairly faithifully on a smaller scale the conditions of current strength and phase existing in their primary circuits, meter engineers are realizing ... View full abstract»

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