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Journal of the American Institute of Electrical Engineers

Issue 6 • June 1920

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Displaying Results 1 - 25 of 59
  • Characteristics and performance of arc welding machinery

    Publication Year: 1920, Page(s):531 - 533
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2548 KB)

    THIS paper deals rather briefly at first with the earlier history of arc welding apparatus discussing the increased efficiency of the constant-potential welding circuit and decreased size and cost of the apparatus by changing the generated circuit potential from 75 to 60 volts. Curves are given showing the efficiency increase and also the disadvantages attending any material decrease of the circui... View full abstract»

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  • Recent developments in electro-percussive welding

    Publication Year: 1920, Page(s):533 - 535
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1944 KB)

    FOLLOWING the original experiments of Mr. L. W. Chubb in 1905, machines were built for welding wires by the electro-percussive process and these have been used in a limited way for lamp leads, copper terminals on aluminum coils and similar applications. View full abstract»

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  • Arc welding machinery of the U. S. Light & Heat corporation

    Publication Year: 1920, Page(s):535 - 536
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB)

    THE U. S. Light & Heat Corporation produces only the single-circuit or single-operator type of arc welding machine, wherein control of the current accompanying inverse changes in arc voltage and length is accomplished by inherent action of the machine windings, unaided by interposed circuit resistors. View full abstract»

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  • Automatic arc welding apparatus

    Publication Year: 1920, Page(s):536 - 537
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    AMONG the requirements which must be met by arc welding equipments are simplicity and reliability. Their importance is increased by the fact that in a great many cases these equipments are installed and operated in locations where no trained electrical help is available. A new type of arc welding generator is described which inherently possesses the electrical characteristics desirable for single ... View full abstract»

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  • Power factor in polyphase circuits: Preliminary report of special joint committee

    Publication Year: 1920, Page(s): 538
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    Freely Available from IEEE
  • Polyphase power factor

    Publication Year: 1920, Page(s):538 - 540
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (645 KB)

    IN a single-phase circuit the various factors relating to power and energy are very clearly defined. For example, power is defined as the rate of energy transfer; apparent power is defined as the product of the r. m. s. value of voltage across the circuit by the value of the current in the circuit. View full abstract»

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  • Measurement of power factor on unbalanced polyphase circuits

    Publication Year: 1920, Page(s):540 - 541
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    THE object of this paper is two-fold, first, to give a scientific definition of power factor, and, second, to describe devices for measuring power factor and devices for measuring unbalance of a polyphase system. View full abstract»

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  • Polyphase power factor

    Publication Year: 1920, Page(s):541 - 542
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    THE Special Joint Committee on Determination of Power Factor in Polyphase Circuits has formulated two definitions for this factor. View full abstract»

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  • Power factor in polyphase systems

    Publication Year: 1920, Page(s):542 - 543
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    THE use of a number of different definitions of “power factor” as applied to unbalance polyphase system has led to much confusion. The present paper points out the mutual relations of a number of possible definitions and their relative merits for specific types of circuits. View full abstract»

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  • Polyphase power representation by means of symmetrical coordinates

    Publication Year: 1920, Page(s):543 - 544
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    THIS paper is a more complete presentation of the subject of power representation by means of symmetrical coordinates, which was briefly outlined in the author's paper on Symmetrical Co-ordinates presented at the 30th Annual Convention, 1918. View full abstract»

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  • Polyphase power factors and unbalanced loads

    Publication Year: 1920, Page(s):544 - 545
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    DEFINITION No. 1 in the Committee's report gives a numerical relation applicable to any polyphase circuit, which is also intended to give a measure, as a general average, of the greater outlay of apparatus and plant that the supply of unbalanced loads entails. Without attempting to state whether such numerical averaging gives a fair compromise measure of the added economical burden of carrying unb... View full abstract»

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  • Power factor and unbalance on a polyphase system

    Publication Year: 1920, Page(s):545 - 546
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    In a single-phase or balanced polyphase circuit, the two factors which are contributory to power factors less than unity are wave distortion and phase displacement between current and voltage. In the paper the influence of wave shape is not considered, since in most large modern systems the wave form is nearly sinusoidal. The paper covers balanced and unbalanced polyphase systems without neutral c... View full abstract»

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  • Eddy current losses in armature conductors

    Publication Year: 1920, Page(s): 547
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (243 KB)

    THIS paper covers the development of formulas and curve data which permit of the ready calculation of the eddy current losses in armature conductors. View full abstract»

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  • Temperatures in large alternating current generators

    Publication Year: 1920, Page(s):547 - 548
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    THE general public undoubtedly thinks of the size of a machine in terms of its physical dimensions or the work it can do. To the engineer, largeness involves the difficulties inherent in the design and construction. To him, a 5000 kv-a. generator at 3600 revs. per min. is large, while a 20,000 kv-a. generator at 100 revolutions is not large if considered strictly with reference to the temperature ... View full abstract»

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  • Classification of large steam turbo generator failures

    Publication Year: 1920, Page(s): 548
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (249 KB)

    The writer classifies fifty-five generator failures of which he has a record or report. The machines are installed in different parts of this country. Their capacities range from 5000 to 30,000, the smaller size dating back from twelve to sixteen years, and the larger being of more recent manufacture. View full abstract»

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  • Ventilation and temperature problems in turbo generators

    Publication Year: 1920, Page(s):548 - 549
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (463 KB)

    THERE are four effective materials concerned in turbo-generator operation, namely, the iron for magnetic purposes, the copper in the windings, the insulation encasing the windings and the ventilating air. As the iron and copper have long since been carried to their practical limits, it follows that the major part of recent developments has been in the insulation and the ventilation. In fact, it ma... View full abstract»

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  • Some practical experience with embedded temperature detectors

    Publication Year: 1920, Page(s):549 - 550
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    ENGINEERS are interested in the maximum armature coil temperatures and in the average temperature of the embedded portion of the coil. Only the former are discussed at length in the paper, and test data are submitted to bear out the statements; in general the test data include temperature measurements on the bare copper. View full abstract»

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  • Calculation of magnetic force on disconnecting switches

    Publication Year: 1920, Page(s):550 - 552
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (533 KB)

    THE practical problem of calculating the magnetic force tending to open a disconnecting switch is a useful one to solve. The result is expressed in concise form in formulas (20) and (21) and curves are also given in Figs. 3 and 4 from which the force may be found without using the formulas. View full abstract»

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  • Voltage stresses in reactors in service

    Publication Year: 1920, Page(s):552 - 554
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    THE authors have presented experimental data together with a physical explanation of the phenomena revealed. They have endeavored as far as possible to abstain from mathematics and obstruse theoretical considerations. View full abstract»

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  • Stability of high-power generating stations

    Publication Year: 1920, Page(s):554 - 556
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (686 KB)

    WITH the increasing use of electric power, the size of electric generating systems has steadily increased, from the small high-frequency stations of the early days, to the huge metropolitan systems of today. This created the problem of limiting the destructiveness of the power which can accidently be concentrated at any point of the system. View full abstract»

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  • Considerations which determine the selection and general design of an exciter system

    Publication Year: 1920, Page(s):556 - 557
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB)

    IT is the purpose of this paper (a) to discuss the factors which determine the selection of an exciter system for a generating station and (b) to discuss other general design features of excitation systems. No attempt is made to recommend any particular system for general application but rather to present a method analyzing the problem for a particular case. View full abstract»

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  • Factors in excitation systems of large central station steam plants

    Publication Year: 1920, Page(s): 558
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (255 KB)

    REALIZING that the excitation system is an important factor in successful operation of a large turbo-generator plant, careful attention should be given to the design of a most practical scheme. Underlying principles like simplicity, measured reliability, limited flexibility should not be lost sight of. Probabilities, rather than all possibilities should be carefully weighed and provisions made to ... View full abstract»

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  • Exciters and systems of excitation

    Publication Year: 1920, Page(s):559 - 560
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    IN laying out excitation systems for central power stations continuity of service is the primary requirement. First cost and economy in operation are secondary requirments which must be given due weight. View full abstract»

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  • Application of D-C. generators to exciter service

    Publication Year: 1920, Page(s):560 - 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB)

    THE purpose of the paper is to discuss some of the problems which arise in connection with the use of d-c. machines as exciters; such as choice, range and stability of exciter voltage, stability of parallel operation, responsiveness, use of main rheostats, and use of compound field windings. View full abstract»

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  • Exciter practise in the Northwest

    Publication Year: 1920, Page(s): 561
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    EXCITER practise in existing Pacific Coast plants is indicated in a table giving the number and size of generators, the number and size of exciters with their drive, the manner of connection and whether a regulator is used or not, for the largest or newest hydroelectric plant of each large power company in British Columbia, Washington, Oregon and California. View full abstract»

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Aims & Scope

This Magazine ceased publication in 1923. The current retitled publication is IEEE Spectrum.

Full Aims & Scope