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Transactions of the American Institute of Electrical Engineers

Issue 3 • March 1941

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Displaying Results 1 - 12 of 12
  • A Power-System Governor Sensitive to Frequency and Load

    Publication Year: 1941, Page(s):89 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1666 KB)

    This paper describes a new electrical control system with which a standard power-system governor may be made sensitive to system load as well as frequency. A proposed scheme of application is presented which is believed to permit electrical control of a standard governor instead of mechanical control, without any sacrifice of reliability. View full abstract»

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  • Automatic Printing Ammeter

    Publication Year: 1941, Page(s):93 - 99
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3885 KB)

    A new instrument has been developed which will automatically read and record in numerals, at predetermined time intervals, the ampere loading on 50 different electric circuits. This instrument also adds the readings on groups of circuits and prints these totals in columns beside the ampere load readings. The paper outlines briefly the reasons for developing such a device. The paper also describes,... View full abstract»

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  • Calculation of Initial Breakdown Voltages in Air

    Publication Year: 1941, Page(s):99 - 104
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1376 KB)

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  • Picture Transmission by Submarine Cable

    Publication Year: 1941, Page(s):105 - 108
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2379 KB)

    The direct transmission of pictorial matter over transatlantic submarine cable has become practical through the development of some special types of networks and amplifiers. These are required because of the rapid increase of the circuit attenuation with frequency, and in order to override certain characteristic electrical interference to which the cable is subject. A summary is presented of the f... View full abstract»

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  • The Audio Noise of Transformers

    Publication Year: 1941, Page(s):109 - 112
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    When transformers arc installed near inhabited districts, their noise must be limited to unobjectionable values. Consequently, means of predetermining noise levels from the desin constants of the transformer and means of noise reduction become necessary. It has been determined that the audio noise of transformers originates in the change in dimensions (magnetostriction) produced in the core steel ... View full abstract»

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  • The electric strength of air at high pressure - II

    Publication Year: 1941, Page(s):112 - 115
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1809 KB)

    Results are given of an investigation of the electric strength of air at pressures up to 21 atmospheres. Sparking voltages are presented for air under pressure as measured with 60-cycle alternating voltage applied to sphere gaps. Deviation from the linear pressure-voltage relation that exists at low pressures is discussed, and certain characteristics of sparking in compressed air are noted. View full abstract»

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  • Negative Damping of Electrical Machinery

    Publication Year: 1941, Page(s):116 - 119
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (945 KB)

    This paper presents (1) a more nearly complete and exact criterion of instability or hunting of a synchronous machine as influenced by its armature or tie line resistance, (2) a general stability criterion which includes in one formula three previously separately treated cases: the usual steady state power limit, rotor hunt ing produced by armature resistance, and self-excitation produced by serie... View full abstract»

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  • Hollow Pipes of Relatively Small Dimensions

    Publication Year: 1941, Page(s):119 - 122
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (805 KB)

    SEVERAL cross sectional shapes for hollow-pipe transmission lines are described that provide lower operating frequencies for given outside dimensions than do the simple shapes heretofore proposed. The theory for one such line, the ``septate coaxial cable'' is derived, and experiments are reported. Cavity resonator embodying these principles are also described. View full abstract»

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  • Impulse and 60-Cycle Characteristics of Driven Grounds

    Publication Year: 1941, Page(s):123 - 128
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2178 KB)

    This investigation presents test data on the impulse and 60-cycle characteristics of common rods driven in natural soil (largely clay composition). It sums up and analyzes the results in the characteristic curve of the ratio of impulse to 60-cycle resistance for impulse currents that represent conditions ranging from a traveling surge to direct strokes of lightning. The basic reasons for the perfo... View full abstract»

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  • Minimum Insulation Level for Lightning Protection of Medium-Voltage Lines

    Publication Year: 1941, Page(s):128 - 132
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2138 KB)

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  • D-C Breakdown Strength of Air and of Freon in a Uniform Field at High Pressures

    Publication Year: 1941, Page(s):132 - 135
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1021 KB)

    D-c breakdown studies of air in a uniform field have been extended to 1,000 kv. D-c studies of Freon (CCl2F2) have been extended to over 350 kv and to 135 pounds, per square inch absolute. The departure from Paschen's law at the higher values of pressure times gap is noted. The mechanisms which account for the higher insulating strength of such gaseous compounds as CCl2<... View full abstract»

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  • A Five-Figure Table of the Bessel Function In(x)

    Publication Year: 1941, Page(s):135 - 136
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

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