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Electrical Engineering

Issue 12  Part Supplement • Date Dec. 1946

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Displaying Results 1 - 25 of 97
  • [Front cover]

    Publication Year: 1946, Page(s): c1
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    Freely Available from IEEE
  • Contents

    Publication Year: 1946, Page(s): 1
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    Freely Available from IEEE
  • Radio telemetering for testing aircraft in flight

    Publication Year: 1946, Page(s):861 - 870
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2368 KB)

    A brief résumé is given of the factors which necessitated the development of thoroughly practicable and reliable telemetering equipment for dynamic testing of high-speed aircraft in flight. An outline of a radio telemetering system is presented which was developed under contract and accepted as suitable for structural flight testing by the United States Navy Bureau of Aeronautics in ... View full abstract»

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  • Negative resistance effects in saturable reactor circuits

    Publication Year: 1946, Page(s):870 - 881
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2345 KB)

    Sustained oscillations exhibiting many of the properties of free oscillations are found in saturable reactor circuits under appropriate conditions. The frequencies of such oscillations are classified in relation to that of the driving source as 1. Incommensurable. 2. Subharmonic, and multiples thereof. 3. Harmonic. View full abstract»

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  • Rotating electric machine time constants at low speeds

    Publication Year: 1946, Page(s):882 - 886
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1090 KB)

    THE use of the concept of time constants in the analysis of a-c rotating electric machine transients is well known.1 It is also well known that the short-circuit time constants of machines running at normal speed are not at all like those of the same machines at rest. The purposes of this paper are to show the continuous nature of the variation of the machine characteristics in the rang... View full abstract»

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  • Design of induction heating coils for cylindrical magnetic loads

    Publication Year: 1946, Page(s):887 - 892
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1382 KB)

    Equations are presented whereby the authors' previous paper1 is extended to the design of coils for heating magnetic loads, where the load remains in a fixed position relative to the coil during the heat. In heating magnetic materials, there is considerable variation in impedance of the coil circuit as the load temperature changes. The present paper first develops certain general princi... View full abstract»

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  • Formulas for calculating the inductance of channels located back to back

    Publication Year: 1946, Page(s):893 - 899
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1457 KB)

    IN 1937 Arnold1 published an analytic procedure enabling the designer of a single-phase 2-conductor bus to determine combinations of conductor spacing and cross section that render proximity and skin effects (a-c resistance, eddy-current losses, and current density distortion) a minimum. For explicit details the reader is referred to Arnold's paper. For our purpose it suffices to remark... View full abstract»

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  • Improvements in performance of hydroelectric generating units on the 2,000,000-horsepower saguenay system

    Publication Year: 1946, Page(s):900 - 910
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2669 KB)

    THE large number of similar high-capacity hydroelectric generating units in the power plants of the Saguenay system have afforded an unusual opportunity to effect improvements in efficiency, reliability, and output of such units. Well organized operating records, thorough engineering studies and experimentation, and farsighted management all have contributed to this result. View full abstract»

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  • The electrical performance of ceramic dielectrics at elevated temperatures

    Publication Year: 1946, Page(s):911 - 919
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2057 KB)

    Some recent developments have emphasized the need for information concerning the temperature at which dielectrics can be operated without electrical breakdown. This paper deals primarily with porcelain, but some data are included on the performance of steatite, glass, and zircon compositions. Data are presented on the variation in resistivity of the materials with varying temperature and also with... View full abstract»

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  • Tennessee Valley authority hydroelectric stations — Electrical and mechanical design

    Publication Year: 1946, Page(s):920 - 930
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3056 KB)

    Design policies have been developed and established during the building and operating of 14 major hydroelectric generating stations since 1934. Turbines, governors, generators, transformers, switchgear, and other major equipment have been selected generally in accordance with normal manufacturers' designs except in specific cases where operating experience has indicated a definite need for improve... View full abstract»

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  • Electronic control of frequency converter sets for testing aircraft models

    Publication Year: 1946, Page(s):931 - 939
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2189 KB)

    THE TESTING of airplane scale models in wind tunnels has brought about a demand for variable frequency a-c power for controlling the speed of power model motors used to drive the propellers of the plane models. To obtain aerodynamic data on the plane model which are equivalent to the expected performance of the actual plane, it is necessary to drive the model propellers at speeds greatly in excess... View full abstract»

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  • Modern excitation systems for large synchronous machines

    Publication Year: 1946, Page(s):939 - 945
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1929 KB)

    AN EXCITATION SYSTEM consists essentially of an exciter and means for its regulation. Originally, manual control of voltage was used widely. With the development of power systems using modern apparatus, automatic control, in general, has come to play an important part in the progress of the electric power industry. Therefore, it is in keeping with this progress that voltage regulators have been us... View full abstract»

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  • High vacuum leak testing with the mass spectrometer

    Publication Year: 1946, Page(s):946 - 955
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2184 KB)

    THE DETECTION of small leaks in large all-metal vacuum systems has long been a troublesome manufacturing problem for which there was no satisfactory solution. All of the generally used techniques of leak detection are cumbersome or have serious limitations such as lack of sensitivity, lack of selectivity, poor response, dependence upon vacuum conditions, uncertainty of interpretation of response, ... View full abstract»

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  • Current and torque of D-C machines on short circuit

    Publication Year: 1946, Page(s):956 - 965
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1959 KB)

    This paper presents formulas, in terms of easily evaluated coefficients, for the armature current, field current, and torque of d-c machines on short circuit. The method of the paper makes it unnecessary to calculate the mutual inductance between the armature and field windings. Heretofore, this mutual inductance (between the two windings which normally are in quadrature with each other) has made ... View full abstract»

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  • Temperature limits for short-time overloads for oil-insulated neutral grounding reactors and transformers — II

    Publication Year: 1946, Page(s):966 - 973
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1406 KB)

    In part I, published in 1938,1 the principal question considered was the effect of ventilating coils on temperature limits for ground faults greater than one minute, for which it was assumed that 160 degrees centigrade based on all heat stored in copper was the correct limit. View full abstract»

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  • Long-distance power transmission as influenced by excitation systems

    Publication Year: 1946, Page(s):974 - 986
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1945 KB)

    THE renewed attention now being given to transmission of power from hydroelectric sites located at moderate and long distances from their load areas requires a re-evaluation of some of the factors affecting power system stability. This paper shows that the electrical loadings of long distance transmission systems may be increased a significant amount by the use of automatically controlled excitati... View full abstract»

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  • Functional analysis of measurements

    Publication Year: 1946, Page(s):987 - 994
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1798 KB)

    HISTORY tells us that measurement has been one of the principal foundations upon which the material progress of mankind has been based. It is only by carefully comparing or measuring the unknown in terms of some known quantity or unit that real knowledge is advanced. As our modern way of living increases in complexity and as our knowledge of science and technology expands, measurements and measuri... View full abstract»

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  • Simplicity in protective relaying

    Publication Year: 1946, Page(s):995 - 999
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1437 KB)

    SIMPLICITY is of paramount importance when designing and laying out protective relay circuits. These circuits are called upon to operate so infrequently that they should be more reliable than the apparatus or lines they protect. Certain limiting conditions and requirements requested by circuit designers generally cause false tripping and make the circuits less reliable. A simple protective system ... View full abstract»

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  • Electromechanical transient performance of induction motors

    Publication Year: 1946, Page(s):1000 - 1009
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1770 KB)

    This paper is the result of a differential analyzer study of the starting characteristics of 2-phase induction motors. The prototype of the motors investigated is the small 2-phase machine commonly used in closed cycle control systems. The performance equations of the induction motor are solved, and summary curves based upon the conclusions reached are presented in a form useful to motor designers... View full abstract»

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  • Oscillations of a high-voltage secondary winding

    Publication Year: 1946, Page(s):1010 - 1019
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1948 KB)

    THE PHYSICAL THEORY of the characteristic oscillations of a high-voltage winding as a primary, that is, when the voltage disturbances are impressed directly across its terminals, is now well known.1 However its behavior as a secondary with respect to the disturbances is not as well known. Although papers2–4 have been published on this latter subject, this paper present... View full abstract»

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  • The development of modern excitation systems for synchronous condensers and generators

    Publication Year: 1946, Page(s):1020 - 1027
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2221 KB)

    DURING the past 15 years and particularly in the past ten years, there have been many major developments in excitation systems for synchronous condensers and generators. These changes and improvements were stimulated in 1928 by the introduction of the hydrogen-cooled synchronous condenser which necessitated a reconsideration of the excitation arrangement and brought about a change from a direct-co... View full abstract»

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  • Performance criteria for current-limiting power fuses — I

    Publication Year: 1946, Page(s):1028 - 1034
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2640 KB)

    POWER fuses are used at many locations on transmission and industrial power systems to insure the prompt interruption of serious short-circuit currents, An engineer making such an application primarily desires assurance that the fuses will be capable of safely interrupting all magnitudes of short-circuit current up to the maximum the system can produce. View full abstract»

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  • Performance criteria for current-limiting power fuses — II

    Publication Year: 1946, Page(s):1034 - 1044
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2328 KB)

    THIS PAPER is part of an analytical study conducted for the purpose of establishing a sound fundamental interpretation of observed performance characteristics of high interrupting-capacity power fuses of the current-limiting type. Some of the more important conclusions, which have been verified by a study of test performance, are presented and discussed in the foregoing part of this paper by C. L.... View full abstract»

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  • The use of business machines in determining the distribution of load and reactive components in power line networks

    Publication Year: 1946, Page(s):1045 - 1046
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (705 KB)

    THE ANALYZER BOARDS available at various points in the United States have afforded welcome relief from the tedious calculations which are ordinarily necessary in determining the distribution of load and reactive component in electric power networks. Since, however, they frequently are located inconveniently, power engineers still have to use longhand methods on their current problems and often hav... View full abstract»

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  • Dielectric strength of station and line insulation to switching surges

    Publication Year: 1946, Page(s):1047 - 1053
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1942 KB)

    THE STRIDES achieved since the early thirties in the field of system-insulation rationalization are well known in recent technical literature1–7 and need not be reviewed here. However, a point to emphasize is that further progress in this industry-wide problem can be attained only through continued research and studies directed particularly to the remaining major questions. In th... View full abstract»

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Aims & Scope

This Periodical ceased publication in 1963. The current retitled publication is IEEE Spectrum.

Full Aims & Scope