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Electrical Engineering

Issue 5 • Date May 1933

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Displaying Results 1 - 25 of 33
  • [Front cover]

    Publication Year: 1933 , Page(s): c1
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  • [Front inside cover]

    Publication Year: 1933 , Page(s): c2
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  • Contents

    Publication Year: 1933 , Page(s): 291 - 292
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  • The balancing of economic forces: Second progress report of American engineering council

    Publication Year: 1933 , Page(s): 293 - 303
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    The second progress report of Council is divided into 2 parts: (1) An analysis of 40 alleged causes of business instability, and (2) a selected group of 23 individual plans to prevent or minimize the effects of business recession. Part 1 of this second progress report is presented herewith in essentially full text, without comment, but with an open invitation for comments, criticisms, and suggestions. View full abstract»

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  • Neon tube characteristics

    Publication Year: 1933 , Page(s): 304 - 307
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    Information supplementing and confirming the studies of voltage and current waves in neon tubes published in a previous issue of ELECTRICAL ENGINEERING are presented herewith. It is shown that there is a peaked starting voltage at the beginning of each wave, the current is practically zero at this point, the time during which the current wave remains at zero is negligible for a properly processed tube, and flickering will occur if the current remains at zero for even one-third cycle. Information on transformer regulation also is given. View full abstract»

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  • Radio aids to air navigation

    Publication Year: 1933 , Page(s): 307 - 313
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  • The segregation of water power costs

    Publication Year: 1933 , Page(s): 313 - 318
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    An analysis of system power costs is of importance to system engineers as well as to the management, provided that the information is in a form readily usable for their particular problems. In the accompanying article is given a useful method of analysis. View full abstract»

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  • Power, power factor, and reactive volt-amperes

    Publication Year: 1933 , Page(s): 319 - 323
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    As part of the symposium on reactive power to be conducted at the Institute's Schenectady, N. Y., meeting, May 10–12, 1933, the following article discusses the relations between power, reactive volt-amperes, and power factor for sinusoidal and non-sinusoidal electromotive forces and currents. Vector equations for these relations are derived, and polyphase power and reactive volt-amperes are defined. Non-linear circuits are discussed. The method of symmetrical components is used for the analysis. View full abstract»

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  • The induction motor a versatile device

    Publication Year: 1933 , Page(s): 323 - 326
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    Formerly considered useful only for constant speed service, the induction motor is becoming a motor of almost universal application. This article describes how the general characteristics of the induction motor may be varied to meet the requirements of several typical applications, some of which would have been considered impossible a few years ago. View full abstract»

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  • Protection of polyphase motors

    Publication Year: 1933 , Page(s): 327 - 331
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    Standard squirrel cage motors of moderate size have been studied to determine the protection against overheating secured by standard control devices. The results of these tests on the heating of motor windings and the temperatures at which control devices function, are presented herewith in a manner easy to follow and not complicated by the more highly theoretical considerations. View full abstract»

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  • Transoceanic radio communication

    Publication Year: 1933 , Page(s): 331 - 337
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  • Equipment for electrical precipitation

    Publication Year: 1933 , Page(s): 337 - 340
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    Vacuum tube rectifiers have proved their superiority over mechanical rectifiers for supplying high voltage direct current for the precipitation of solids and liquids from gases by electrical means. In this article the general requirements for this service are outlined and a typical vacuum tube installation described. View full abstract»

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  • Abstracts of papers to be presented at the Schenectady district meeting

    Publication Year: 1933 , Page(s): 341
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  • The electrical characteristics of impregnated cable papers

    Publication Year: 1933 , Page(s): 341
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    IN CONNECTION with the investigation of ionization in impregnated paper insulated cables conducted at The Harvard Engineering School under auspices of the impregnated paper cable research committee of the National Electric Light Association, it was found necessary to determine over a considerable range of voltage gradient, temperature, and frequency, the electrical characteristics of cable paper impregnated with different cable oils and compounds. The impregnation was conducted under almost ideal laboratory conditions so that little if any gas was occluded. When the results of the measurements were rationalized and analyzed, it was found that to a remarkable degree they all conformed to the same general laws. These laws and the analyses of the electrical characteristics into components may appear to be only empirical. However, they are results of some fundamental causes, involving probably molecular and intramolecular reactions. Therefore, aside from any value which the results presented may have as engineering data, they may at some time be of value in confirming or in disproving some more fundamental theories of dielectrics. Moreover, it is found that actual cables when impregnated so thoroughly that they manifest no appreciable ionization, have electrical characteristics comparable to those obtained with these samples impregnated under almost ideal conditions. The conclusions presented in this paper are as follows: 1. An abrupt change in the slope of the cooling curves of some cable compounds occurs in the neighborhood of 50 deg C; this may indicate changes in the molecular structure. 2. It appears to be a general law that the power loss in cable compounds varies as a constant exponential power of the voltage gradient, the exponent usually being 2 at room temperature; at higher temperatures it may be greater or less than 2. 3. The power factor characteristics of cable compounds are exponential functions of the voltage gradient, the exponent being related to that- for the power characteristics. 4. The power-frequency characteristics are essentially linear, having a positive intercept at zero frequency. 5. The power factor-frequency characteristics are essentially rectangular hyperbolas. 6. The equivalent series resistivity-voltage gradient characteristic is the same type of function as the power factor-voltage gradient characteristic. 7. The equivalent parallel conductivity-voltage gradient characteristic is the same type of function as the power factor-voltage gradient characteristic. 8. The power-temperature characteristics for constant frequency and constant voltage gradient appear to consist of 2 terms, each of which is a constantexponential function of the temperature. (A.I.E.E. paper No. 33–58) View full abstract»

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  • Loss characteristics of silicon steel at 60 cycles with D-C excitation

    Publication Year: 1933 , Page(s): 341
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    CORE-LOSS and excitation characteristics of sheet steel subjected to combined alternating and direct magnetic fields, have been subjects of investigation for the past 20 years. Such combined fields occur in many types of electrical apparatus. This paper presents the results of a series of 60-cycle core-loss and excitation tests with superposed d-c excitation, which recently were made on silicon sheet steel. View full abstract»

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  • Design of resistance welder transformers

    Publication Year: 1933 , Page(s): 341
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    DUE TO increased production demands, the speed at which resistance welders operate has been stepped up as much as 4 to 5 times during the last few years. This has been made possible in a large degree, by the development of new switching mechanisms that will allow a current dwell of a fraction of a cycle on 60-cycles. View full abstract»

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  • Radio aids to air navigation

    Publication Year: 1933 , Page(s): 342
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  • Reactive and fictitious power

    Publication Year: 1933 , Page(s): 342
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  • Reactive power and power factor

    Publication Year: 1933 , Page(s): 342
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    GENERAL definitions exist for potential, current, and active and reactive power, that are independent of wave form and of circuit conditions. In order to use these quantities in circuit analysis when there are harmonics present, it is necessary to know their individual harmonic components. By definition, singlephase power factor is a blanket factor which covers and so disregards any deviation in wave form from the sinusoidal. Thus it is not a quantity that can be used in circuit analysis when there are harmonics present. If polyphase power factor is defined as the ratio of the power to the magnitude of the vector volt-amperes it is likewise a useless quantity in circuit analysis if there are harmonics present. Furthermore, this definition of polyphase power factor makes it a derived quantity which depends upon the active and reactive power. Even when there are no harmonics present so that power factor may be legitimately used, the circuit calculations are usually simpler if the loads are determined by their active and reactive powers rather than by their power factors. That is, as far as circuit analysis is concerned, power factor is a quantity whose retirement need scarcely be noted. View full abstract»

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  • Notes on the measurement of reactive volt-amperes

    Publication Year: 1933 , Page(s): 342
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    THE CHARACTER of the quantity known as reactive volt-amperes is first discussed and its dependence upon the assumption of a definite type of periodicity is brought out, this in contrast to certain other a-c quantities. It is pointed out that on account of the rather complicated relation that it bears to the flow of energy in an electric circuit, serious difficulties are met in its measurement except in the simpler conditions of balanced voltages, in a polyphase circuit, and sinusoidal waves. Two procedures are outlined which though they are not premised on balanced voltages have frequency and wave form limitations. View full abstract»

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  • Power, reactive volt-amperes, power factor

    Publication Year: 1933 , Page(s): 342
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  • Operating aspects of reactive power

    Publication Year: 1933 , Page(s): 342
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  • News of Institute and related activities: Summer convention to coincide with engineers week at Chicago

    Publication Year: 1933 , Page(s): 343 - 345
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  • 1893 — The Columbian exposition, Chicago world's fair

    Publication Year: 1933 , Page(s): 346 - 347
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  • A century of progress exposition, Chicago world's fair — 1933

    Publication Year: 1933 , Page(s): 347
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Aims & Scope

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

Full Aims & Scope