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Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics

Issue 3 • July 1955

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Displaying Results 1 - 19 of 19
  • Significant factors in thermal aging tests on flexible sheet insulation

    Publication Year: 1955, Page(s):289 - 293
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1306 KB)

    THE revision of the present temperature classification of insulating materials as in AIEE Standard No. 11 seems increasingly necessary to accommodate insulation application practice and apparatus temperatures to the higher temperature at which some of the newer synthetic materials seem to be safely operable. It has been the goal of the Working Group on the Evaluation of the Thermal Stability of In... View full abstract»

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  • Functional evaluation of magnet wire insulation

    Publication Year: 1955, Page(s):293 - 297
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2619 KB)

    A procedure developed at the Naval Research Laboratory to evaluate the thermal aging properties of magnet wire is presented. The method adopts a coil specimen and subjects it to such stresses as are experienced by the insulation system of a motor. The various factors which influence the aging properties of magnet wire are investigated. Aging data collected by this procedure are presented for a num... View full abstract»

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  • An all-magnetic audio amplifier system

    Publication Year: 1955, Page(s):297 - 301
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1771 KB)

    ALTHOUGH magnetic amplifiers have been used as audio amplifiers, the necessity of generating the high carrier frequency has made their use impractical. The objection to the use of rotating machinery to produce this carrier is the mechanical problem introduced by moving parts, while the use of the vacuum-tube oscillator as a high-frequency source introduces the disadvantages of fragility, short lif... View full abstract»

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  • Empirical equations for the 60-cycle spark-over gradients in commercial oil

    Publication Year: 1955, Page(s):301 - 311
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2630 KB)

    INTENSIVE experimental work on dielectric phenomena in liquids has been done during the last 40 years. There is considerable interest on the engineer's part in obtaining reliable information about the dielectric properties of liquids, especially of commercial oil, used as insulation and as a cooling medium for transformers, circuit breakers and much other electrical apparatus. Many valuable experi... View full abstract»

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  • Gas and moisture equilibriums in transformer oil

    Publication Year: 1955, Page(s):312 - 318
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1773 KB)

    OIL IS the major electrical insulation component of large high-voltage transformers. It must withstand, free of corona, the severe short-time electrical stresses imposed during factory test or abnormal service conditions, as well as the less severe normal-service stresses of long duration. It follows that best insulation design demands precise knowledge not only of the stresses imposed on the oil ... View full abstract»

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  • Some electrical and thermal characteristics of helium and sulfur-hexafluoride mixtures

    Publication Year: 1955, Page(s):318 - 321
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1767 KB)

    The results are presented of a study of some of the electrical and thermal properties of mixtures of helium and sulfur-hexafluoride which are compared with the pure gases: air, hydrogen, helium, and sulfur-hexafluoride. It is shown that the addition of relatively small amounts of sulfur-hexafluoride to helium will result in an electric strength greater than that of air and of hydrogen. The thermal... View full abstract»

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  • A switching transistor D-C to A-C converter having an output frequency proportional to the D-C input voltage

    Publication Year: 1955, Page(s):322 - 326
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1193 KB)

    THE combination of transistors and transformers constructed of square hysteresis loop material has produced much useful circuitry outside of the realm of magnetic amplifiers per se. In this paper a highly efficient and extremely precise converter for transforming direct to alternating current, yielding a square-wave output whose frequency is proportional to the d-c input voltage, will be described... View full abstract»

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  • Magnetic-amplifier control of D-C motors

    Publication Year: 1955, Page(s):326 - 333
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1818 KB)

    ALTHOUGH considerable work has been done on the operation of adjustable-speed d-c motors with armature power supplied by thyratrons1 and by metallic rectifiers controlled with adjustable transformers,2,3 there is little information available on the use of magnetic amplifiers for this purpose. For this reason, an analytical and experimental study was made of the steady-state operation of a d-c moto... View full abstract»

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  • Equations for the inductance and short-circuit forces of 3-phase busses comprised of 120-degree angles

    Publication Year: 1955, Page(s):334 - 339
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1540 KB)

    THREE-PHASE busses comprised of 120-degree-angle conductors, as shown in Fig. 1, possess certain very desirable electrical-mechanical characteristics. Thus, they can be closely nested to the end that the reactance per unit length of bus, and thus the voltage drop per unit length of bus, are much smaller than on other shaped busses of similar current-carrying capacity. Again, 120-degree-angle condu... View full abstract»

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  • An elliptical polarization synthesizer

    Publication Year: 1955, Page(s):339 - 343
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2314 KB)

    An electronic instrument is described which automatically determines the resultant polarization of two superimposed elliptically polarized waves when the polarization of the individual components is known. In addition, a study of the effect of ground pulse contamination on polarization data obtained by sounding the ionosphere is presented. The study serves to demonstrate the usefulness of the inst... View full abstract»

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  • Surface and volume dielectric losses

    Publication Year: 1955, Page(s):343 - 349
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5971 KB)

    A RELIABLE and convenient system has been devised for measuring large numbers of specimens to detect changes in dielectric constant and dissipation factor due to exposure to controlled conditions of temperature and humidity. A group of four plastic materials consisting of a molded mica-filled phenolic (MFE), a glass silicone laminate (GSG), polytetrafluoroethylene (PF) and polyethylene (PE), were ... View full abstract»

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  • Dielectric failure of volume and surface types

    Publication Year: 1955, Page(s):349 - 356
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6786 KB)

    IN THIS investigation, an attempt is made to obtain an interpretation of phenomena and also to serve practical ends. Since laboratory tests are preferably simple and of a controlled nature, the results are very limited when weighed against the multitudinous considerations of field applications. After earlier exploration, in which both materials and techniques were given careful scrutiny, four soli... View full abstract»

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  • A variable frequency magnetic-coupled multivibrator

    Publication Year: 1955, Page(s):356 - 361
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2706 KB)

    IN THE last decade, the technology of magnetic core materials has advanced such that magnetic cores are being used in many electronic applications over and above conventional use in transformers. Take, for example, magnetic amplifiers, computers, television components, to mention a few. View full abstract»

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  • A continuous-flow moisture detector

    Publication Year: 1955, Page(s):361 - 367
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1808 KB)

    MOISTURE is one of the main foes of electric apparatus. In liquid-filled apparatus such as transformers, excessive moisture in the liquid can be a reflection of a similar situation in the solid insulation. The problem of detecting accurately these minute quantities of water in the liquid is an extremely important one and has received considerable attention in the past. View full abstract»

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  • A new test board for portable watt-hour meter standards

    Publication Year: 1955, Page(s):367 - 373
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3130 KB)

    THE Central Laboratory of the New England Power Service Company maintains the watt-hour standards for the New England Electric System. Until very recently, the methods and equipment used were similar to those found in many utility laboratories. Primary standards were standard cells, which, through potentiometers, volt boxes and shunts, established the calibration of laboratory standard wattmeters.... View full abstract»

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  • A fully selective telemetering system employing telegraph facilities

    Publication Year: 1955, Page(s):373 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3004 KB)

    IN APRIL of 1953 the Mississippi Valley Gas Company, whose headquarters are located in Jackson, Miss., approached commercial representatives of the Southern Bell Telephone and Telegraph Company concerning the provision of a telemetering system between their dispatcher's office in Jackson and 17 points in the central and northwestern section of the state to which natural gas was being furnished thr... View full abstract»

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  • Shielding of communication cables

    Publication Year: 1955, Page(s):378 - 387
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2268 KB)

    IN THE course of designing and manufacturing electric cables, the need for shielding frequently arises, sometimes because of inductive interference and sometimes because of high-voltage considerations. This discussion is confined to relatively low-voltage cables where inductive interference is the problem. View full abstract»

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  • Progress in the evaluation of solid-core high-voltage bushings

    Publication Year: 1955, Page(s):387 - 394
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3194 KB)

    A HIGH-VOLTAGE bushing which successfully sustains repeated application of 60-cycle and impulse test voltages may not be adequate for prolonged operation at rated line-to-ground voltage. Methods to evaluate bushings at voltages slightly in excess of operating voltages have therefore been devised. The techniques developed have been used to evaluate the life characteristics of the solid compound cor... View full abstract»

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  • Improving field analogues through conformal mapping

    Publication Year: 1955, Page(s):395 - 400
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3037 KB)

    Conformal mapping leads to improved models for the electrolytic tank and similar analogues of fields encountered in engineering problems. The effect of tank boundaries can be eliminated and regions of special interest can be greatly magnified. Conformal mapping has a validity more general than is commonly realized. It can, for example, be applied to the construction of models of rotationally symme... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1963. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope