Transactions of the American Institute of Electrical Engineers

Issue 2 • April 1928

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Displaying Results 1 - 25 of 56
  • Table of contents

    Publication Year: 1928, Page(s): nil1
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  • Surge Impulse Breakdown of Air

    Publication Year: 1928, Page(s):349 - 355
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3960 KB)

    This paper describes a phenomenon which is used as a method of studying the development of high-voltage sparkover. It has been found that if a voltage which rises very rapidly to a value more than sufficient to cause breakdown if continuously applied is impressed upon a sphere-gap, and this is very quickly reduced to a low value, luminous streamers are produced instead of the usual intense spark. ... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):355 - 360
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  • Approximate Solution for Electrical Networks When These are Highly Oscillatory

    Publication Year: 1928, Page(s):361 - 365
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    The general solution to the slightly damped network is expressed in terms of the undamped solution by means of series expansions. The first part of the paper gives a method for evaluating the complex roots of the determinantal equation, and the second part shows how the expansions of the first part may be correlated with the Heaviside formula to form the complete approximate solution. An example i... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s): 365
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  • The Boltzmann-Hopkinson Principle of Superposition as Applied to Dielectrics

    Publication Year: 1928, Page(s):366 - 368
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (674 KB)

    The principle of superposition, discussed first for dielectrics by Hopkinson, has been shown for a long time in experiment. However, its validity for the several theories which have been advanced for dielectric behavior has been shown in only a few cases. One of the exceptions is the important theory of Maxwell.2 This paper shows that the principle of superposition is a necessary conseq... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):368 - 371
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  • Symposium on Interconnection Conowingo Hydroelectric Project with Particular Reference to Interconnection

    Publication Year: 1928, Page(s):372 - 381
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3635 KB)

    This paper discusses the interconnection between three of the leading power supply companies in the eastern part of the country, the Philadelphia Electric Co., the Pennsylvania Power & Light Co., and the Public Service Electric & Gas Co. It outlines the physical aspects of the tie-in between the companies which is a 220-kv. ring of high-load capacity, triangular in shape with sides respect... View full abstract»

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  • Progress and Problems From Interconnection in Southeastern States

    Publication Year: 1928, Page(s):382 - 392
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2555 KB)

    Great progress has been made. Interconnection between independent systems is primarily a protective measure. The greatest economic benefits have been realized when the interconnections have been made by subsidiary companies of one holding company. The capacity of tie lines and the amount of power interchanged has increased greatly. The size of generating units has increased, as has the size of pow... View full abstract»

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  • Some Aspects of Pacific Coast Interconnections

    Publication Year: 1928, Page(s):393 - 398
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1518 KB)

    This paper tells in general of the reasons for, and the advontages of, interconnection between poower supply systems. It enumerates five essential factors which. must be considered in successful operation of interconnected systems; namely, (1) dependoable communication; (2) centralized authority and control over operations; (3) location and isolation of trouble; (4) voltage regulation and control ... View full abstract»

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  • Interconnection and Power Development in Chicago and the Middle West

    Publication Year: 1928, Page(s):399 - 408
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2426 KB)

    The development of power stations in the Chicago District is described, showing how small stations have been replaced, and the energy supply for light, power, and traction consolidated by the use of high-voltage lines. The interconnections between stations and the developments of recent years and for the immediate future are outlined. This includes cables at 66,000 and 132,000 volts, with circuit ... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):408 - 422
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  • Saturation Permeameter

    Publication Year: 1928, Page(s):423 - 427
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1762 KB)

    The saturation permeameter is a device for speedy and accurate measurement of saturation value of magnetic material; that is, for measurement of the limiting value of intrinsic induction (ß) characteristic of that material. The permeameter in its present form is of the well-known bar-yoke type, with a magnetizing coil capable of producing a magnetizing force of H = 4500 g. without excessive heati... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):427 - 428
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  • Compressed Powdered Permalloy Manufacture and Magnetic Properties

    Publication Year: 1928, Page(s):429 - 436
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5581 KB)

    The paper gives a brief description of the manufacture of magnetic cores of compressed permalloy powder followed by information covering their magnetic properties with particular reference to their, use in loading coils. Production of the powder, and its insulation, pressing, and annealing are discussed. Under magnetic properties, permeability, core loss, and modulation are treated. Curves are giv... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):436 - 437
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  • The Effect of Humidity on the Dry Flashover Potential of Pin-Type Insulators

    Publication Year: 1928, Page(s):438 - 441
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1687 KB)

    This paper shows that humidity affects considerably the flashover voltages of porcelain and Pyrex insulators. The flashover potential rises as the humidity is increased. The tests were made on pin-type insulators and on rods. The results show that this rising characteristic is a surface effect which varies with the absolute water content of the surrounding atmosphere. View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):441 - 445
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  • The Cathode Oscillograph as Used in the Study of Lightning and Other Surges on Transmission Lines

    Publication Year: 1928, Page(s):446 - 455
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5349 KB)

    Visible records of the effects of lightning surges and transients on transmission lines are described in this paper, which explains the operation of a specially constructed cathoderay oscillograph. The outstanding feature of this oscillograph is its ability to record phenomena of a microsecond in duration, while at the same time the instrument is maintained in an exposed position for as much as a ... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):455 - 456
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  • Synchronous MachinesߞIV

    Publication Year: 1928, Page(s):457 - 487
    Cited by:  Papers (59)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (12014 KB)

    The special case of cylindrical rotor machines has been treated previously by Boucherot and others. The present paper solves the general case, including salient pole machines. The cylindrical rotor type thus becomes merely a limiting case. The principal assumption which distinguishes the present theory from the extensively studied cylindrical rotor theory is that the total armature self-inductance... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):487 - 492
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  • The Calculation of the Armature Reactance of Synchronous Machines

    Publication Year: 1928, Page(s):493 - 512
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4061 KB)

    This paper presents new and simplified formulas for the armature leakage reactance of synchronous machines, and compares the results obtained with tests on 100 machines of varied types. The new formulas are characterized by novel expressions for the end leakage and for the ``air-gap'' or ``differential leakage'' reactances. Formulas for zero phase-sequence reactances are also given. The definition... View full abstract»

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  • Discussion

    Publication Year: 1928, Page(s):512 - 513
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  • The Reactances of Synchronous Machines

    Publication Year: 1928, Page(s):514 - 535
    Cited by:  Papers (59)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5694 KB)

    Until somewhat recently, synchronous machine theory has been satisfied with a relatively few characteristic constants, or reactances, in terms of which the behavior of machines has been calculated. Present theory, however, requires many more coefficients. There are now generally recognized two values each of leakage, synchronous, and transient reactance which correspond to the two symmetrical axes... View full abstract»

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