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Electrical Engineering

Issue 12  Part Supplement • Dec. 1941

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Displaying Results 1 - 25 of 114
  • [Front cover]

    Publication Year: 1941, Page(s): c1
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    Freely Available from IEEE
  • Contents

    Publication Year: 1941, Page(s): 1
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    Freely Available from IEEE
  • Contents

    Publication Year: 1941, Page(s): 1
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    Freely Available from IEEE
  • Stability limitations of long-distance A-C power-transmission systems

    Publication Year: 1941, Page(s):1051 - 1059
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (993 KB)

    Conventional methods of transmission are analyzed and discussed both for existing transmission distances up to about 300 miles and for greater distances up to a full wave length; also eight different methods that have been proposed for increasing the loading per circuit or distance to which a-c power can be transmitted are discussed. Of these methods, series compensation of the line reactance appe... View full abstract»

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  • System lower-harmonic voltages — Methods of calculation and control by capacitors

    Publication Year: 1941, Page(s):1060 - 1066
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (673 KB)

    A LARGE capacitor bank recently installed at Winchester, Virginia, is supplied with a series reactor to tune it to the fifth harmonic of the power frequency. This is the pioneer installation in the United States of this novel means of reducing the fifth harmonic voltage over a broad expanse of system — 33 kv in this case. The paper defines the field of application for this arrangement in co... View full abstract»

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  • A thyratron circuit for theater lighting

    Publication Year: 1941, Page(s):1067 - 1072
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB)

    AT present there is a definite need in small theaters, such as those in colleges and universities, for a flexible, highly advanced system of stage lighting control. During recent years such systems capable of supplying the relatively tremendous loads of the large muscial comedy houses — up to about 25 kilowatts individual circuit capacity — have been developed. However, little attent... View full abstract»

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  • Electric shock

    Publication Year: 1941, Page(s):1073 - 1078
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1549 KB)

    A REVIEW of the literature has revealed very little information regarding the effects of small 60-cycle electric currents on man. These currents are not sufficient to produce unconsciousness or death but they are sufficient to produce involuntary muscular contractions. The hazard to the public has been increased because of the recent development and application of electrical devices with exposed e... View full abstract»

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  • Rural automatic telephone networks

    Publication Year: 1941, Page(s):1079 - 1083
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1969 KB)

    THE communication problems of rural areas offer an unique opportunity for the application of automatic switching methods. In no other situation is the combination of factors so favorable. Automatic exchanges are particularly suited to rural needs, especially when they are installed as unattended units in connection with nearby attended exchanges. The principal benefit springs from the fact that in... View full abstract»

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  • Powerton-crawford 220-kv line-system operating features and terminal design

    Publication Year: 1941, Page(s):1084 - 1089
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1421 KB)

    A 220-kv line, 150 miles long has been constructed between Powerton Station near Peoria, Illinois, and Crawford Station in the city of Chicago. This line will probably operate continuously near the static stability limit and will deliver 150,000 kilowatts to the city from Powerton Station near the coal fields of southern Illinois. This line has the highest capacity of any in this area and includes... View full abstract»

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  • Television transmission over wire lines

    Publication Year: 1941, Page(s):1090 - 1096
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3485 KB)

    Intercity networks appear vital to the success of television broadcasting. Experiments with wire lines for this purpose and for local transmission of present-day television signals are reported herein. The design and construction of the equipment used are described and its performance characteristics given. The intercity lines discussed involve carrier transmission over coaxial cable with repeater... View full abstract»

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  • Prolonged inrush currents with parallel transformers affect differential relaying

    Publication Year: 1941, Page(s):1096 - 1101
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (643 KB)

    It has long been known that transient magnetizing inrush currents, sometimes reaching magnitudes as high as eight times full-load current, may flow in a transformer winding for a period following the moment when it is energized by connecting it to an electric power circuit.1 It has not been generally appreciated, however, that other transformers already connected to the power circuit ne... View full abstract»

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  • Basic principles of the varioplex telegraph

    Publication Year: 1941, Page(s):1102 - 1107
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (615 KB)

    A new kind of channel-sequencing system allots the full capacity of a telegraph circuit to the busy channels alone. A busy channel cuts itself out of its sequential position by becoming idle but may re-enter the sequence at will by offering one letter for transmission. Entry, mixing, and exit are accomplished by electromechanical control of standard start-stop and multiplex printing telegraph appa... View full abstract»

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  • Powerton-crawford 220-kv line — Design and construction features

    Publication Year: 1941, Page(s):1108 - 1120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6480 KB)

    THE placing in service of the 220-kv Powerton-Crawford transmission line of the Commonwealth Edison Company marks the completion of a project begun 12 years ago and subsequently dropped during the depression years. When work was suspended in 1932, most of the right-of-way had been secured, tower sites were located, the tower contracts had been let, typical towers had been built and tested, and som... View full abstract»

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  • Short-circuit calculating procedure for low-voltage A-C systems

    Publication Year: 1941, Page(s):1121 - 1135
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1514 KB)

    FAULT currents in electrical systems depend upon the impedance of the circuit for their intensity. Stresses, both thermal and mechanical, occur due to such currents and at various time intervals following initiation of the fault. Such stresses are of primary interest in system and equipment design. The possible amount of short-circuit current in any system equals the quotient of the voltage divide... View full abstract»

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  • Surge characteristics of two-winding transformers

    Publication Year: 1941, Page(s):1136 - 1144
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    THE object of this paper is to show the performance of transformers with two windings in the rapid-transient state when surges develop in their conductors. On the one hand, we will determine the characteristic constants for traveling waves, as surge-impedance and wave velocity, from the data of the transformer. On the other hand, we will consider the rapid interaction of the primary and secondary ... View full abstract»

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  • Methods of determining natural frequencies in coils and windings

    Publication Year: 1941, Page(s):1145 - 1150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A knowledge of the natural frequencies of transformer, reactor, and generator windings is essential for the determination of the transient response of such coils to lightning waves and switching surges, as well as for the calculation of the recovery characteristics of circuit breakers and expulsion gaps. Different testing methods have been employed to determine these natural frequencies, and it ha... View full abstract»

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  • Protection of low-voltage circuits by air circuit breakers in cascade arrangement

    Publication Year: 1941, Page(s):1151 - 1160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2944 KB)

    This paper deals with and outlines a new solution to the problem of providing adequate short circuit protection for low-voltage distribution systems and circuits operating at 600 volts or less. Recent tests and field experience have dispelled the illusion that protective devices of very limited interrupting ability will satisfactorily protect any low-voltage circuit. A recently published calculati... View full abstract»

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  • Diode rectifying circuits with capacitance filters

    Publication Year: 1941, Page(s):1161 - 1167
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (561 KB)

    This paper presents the results of an investigation of the half wave and full wave rectifier circuits with a simple capacitance filter and using either high vacuum or mercury vapor tubes. In the fore part of the paper an equivalent circuit is set up such that when the tube is conducting, a mercury vapor tube is represented by a constant voltage drop or a high vacuum tube by a constant resistance. ... View full abstract»

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  • D-C machine flashover and bus short-circuit protection

    Publication Year: 1941, Page(s):1168 - 1173
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2056 KB)

    The transient induced voltage across the interpole and compensating windings of d-c motors or generators on short circuit or flashover provide a quick and convenient means of actuating circuit breaker or other protective devices. Such means have made possible quicker tripping times than are obtained with the conventional series overload or reverse current protection. View full abstract»

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  • The incandescent lamp situation from the engineering point of view

    Publication Year: 1941, Page(s):1174 - 1180
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB)

    AT this time, when the incandescent electric lamp is perhaps at the zenith of its career, there is a certain propriety in recording its status, in appraising it as an illuminant, and in reviewing the circumstances surrounding its production and use. As an instrument in the advance of civilization, the lamp is highly important. In its technical and economic relationships it has been, and is, the su... View full abstract»

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  • New current transformer for bus differential protection

    Publication Year: 1941, Page(s):1180 - 1187
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2240 KB)

    Perfect current transformers would make all differential relaying simple, but such transformers would be of excessive size and cost. A new idea in current transformer design makes it possible to maintain a linear relation between primary and secondary currents in a transformer of reasonable size, even where high current values, completely offset, are encountered. Such a current transformer is part... View full abstract»

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  • Measurement and control of conductor vibration

    Publication Year: 1941, Page(s):1188 - 1193
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2993 KB)

    A method is outlined for determining the effectiveness of devices used for prevention of vibration fatigue in transmission conductors. Measuring equipment is described which provides records of conductor vibration in the quantitative form essential for such determinations. Vibration records obtained on typical constructions are analyzed and correlated with fatigue tests and operating experience to... View full abstract»

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  • Analytical methods of solving discrete nonlinear problems in electrical engineering

    Publication Year: 1941, Page(s):1194 - 1199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (587 KB)

    More often than not, the nonlinear problems of electrical engineering arise from discrete physical systems and are usually reducible mathematically to the solution of systems of non-linear total differential equations or to systems of nonlinear integral equations. Six independent methods of solving discrete non-linear problems are given in this paper. Each method is illustrated by means of an elec... View full abstract»

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  • Transient torques in squirrel-cage induction motors, with special reference to plugging

    Publication Year: 1941, Page(s):1200 - 1209
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    WHEN a squirrel-cage motor is switched in any way, whether while running or at rest, transient torques, which are usually several times the steady-state torque, occur and must be considered in design. It was desired to obtain a general semi-quantitative view of these torques by considering a limiting case which is accessible analytically with the expectation that a simple rule would be apparent fo... View full abstract»

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  • Electric locomotive application

    Publication Year: 1941, Page(s):1210 - 1214
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    ELECTRIC locomotives were first used for the movement of main-line traffic over 45 years ago. This early application was for tunnel work but it may be taken as the beginning of a new era in main-line transportation. In this era the steam locomotive has been transformed in appearance and characteristics. More recently the Diesel engine has been applied to passenger and freight trains. During all 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