By Topic

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • Design and calculation of induction heating coils

    Publication Year: 1957, Page(s): 149
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    WHEN ALTERNATING CURRENT flows in the coil turns of a typical induction heating load, such as shown in Fig. 1, three components of magnetic flux are established, i.e. (1) in the workpiece, (2) in the air gap, and (3) in the copper of the coil turns. This is characteristic of any induction heating load regardless of shape, size, or frequency, and a general equation can be written for total flux lin... View full abstract»

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  • Tertiary windings in autotransformers

    Publication Year: 1961, Page(s): 359
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    AUTOTRANSFORMERS in power systems are usually Y-connected and commonly have delta-connected tertiary windings. Is the tertiary winding needed? If needed, what should be its size? These are two questions to consider when applying an autotransformer. View full abstract»

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  • Characteristics of smooth bundled conductors

    Publication Year: 1956, Page(s): 598
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    POWER TRANSMISSION at 330 kv is now an accomplished fact in the United States and it seems quite likely that still higher voltage lines may be needed in the near future. Although several of the present 330-kv lines use a single 1.75-inch diameter conductor, it is anticipated higher voltage lines may be built with bundled conductors. View full abstract»

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  • A symbolic analysis of relay and switching circuits

    Publication Year: 1938, Page(s):713 - 723
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2664 KB)

    IN THE CONTROL and protective circuits of complex electrical systems it is frequently necessary to make intricate interconnections of relay contacts and switches. Examples of these circuits occur in automatic telephone exchanges, industrial motor-control equipment, and in almost any circuits designed to perform complex operations automatically. In this paper a mathematical analysis of certain of t... View full abstract»

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  • Three-phase systems with unbalanced wye-connected loads

    Publication Year: 1941, Page(s):80 - 85
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1175 KB)

    The various methods of solving three-phase unbalanced wye circuits, usually found separately in engineering literature, have been brought together here; each is illustrated by a specific example View full abstract»

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  • Overvoltages during power-system faults

    Publication Year: 1939, Page(s):377 - 385
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1709 KB)

    OVERVOLTAGES may be produced by lightning, switching surges, faults, both solid and arcing, and the overspeeding of machines due to loss of load. The effect of circuit and machine characteristics on the duration and magnitude of these overvoltages has received considerable attention.1–10 Furthermore, field tests have been made in order to determine the effectiveness of different ... View full abstract»

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  • Applications of Thevenin's theorem

    Publication Year: 1945, Page(s):103 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (999 KB)

    In the solution of electric-circuit problems, little advantage has been taken except in communication work of the help that may be obtained by the application of Thevenin's theorem. Statements and proof of the theorem and examples of its use are given in this article. View full abstract»

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  • The magnetic fluid clutch

    Publication Year: 1948, Page(s): 1167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (565 KB)

    A new type of magnetic fluid and several classes of new devices utilizing this fluid have been developed at the National Bureau of Standards. One application of this fluid has been in electromagnetic clutches, but the electro-magnetically controlled mixture offers promise for other uses also. View full abstract»

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  • Performance of traveling waves in coils and windings

    Publication Year: 1940, Page(s):1031 - 1040
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2072 KB)

    THE reaction of coils and windings to traveling waves which impinge upon their terminals is an ever-important problem in electric power systems from both the practical and the scientific point of view. Transformers as well as alternators are used at increasingly higher voltages and their insulation is thus subjected to switching and lightning surges of ever-increasing severity. A simplified but ne... View full abstract»

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  • The capacitance of a parallel-plate capacitor by the Schwartz-Christoffel transformation

    Publication Year: 1937, Page(s):363 - 368
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1368 KB)

    AN EXACT method of calculating the capacitance of a parallel-plate air condenser, taking into account its fringing effect, has been suggested by J. J. Thomson1 and more completely worked out by A. E. H. Love.2 The purpose of this paper is to promote familiarity with this mathematical technique by making it more readily accessible to American engineers. In addition to the exac... View full abstract»

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  • Transformer magnetizing inrush currents

    Publication Year: 1951, Page(s): 324
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    THERE ARE formulas available by which it is possible to calculate the peak of the first cycle of magnetizing inrush current for a transformer. There have been no convenient formulas available for determining the maximum values of successive cycles of current. The usual approach has been to use a step-by-step process of mechanical integration that is quite time-consuming and usually is not worth th... 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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  • A special dynamometer for testing small motors

    Publication Year: 1952, Page(s):549 - 551
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1324 KB)

    Based on the principle that output torque is equal and opposite to the reaction on the motor frame regardless of the source of external shaft loading, this dynamometer can make accurate measurements on the performance of motors too small to be tested by the usual methods. View full abstract»

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  • Equivalent circuits for power-flow studies

    Publication Year: 1949, Page(s): 794
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    NETWORK ANALYZER STUDIES of power-flow conditions on large interconnected systems frequently require preliminary simplification and reduction of the network because of the limited number of analyzer circuits and sources available. Even in smaller systems which do not exceed the capacity of the analyzer being used, it is sometimes desirable to represent in detail only a portion of the system, simpl... View full abstract»

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  • Capacitive current switching with circuit breakers

    Publication Year: 1952, Page(s): 595
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    ALTHOUGH POWER circuit breakers are designed primarily to interrupt heavy inductive short-circuit currents, system growth in recent years has produced a greatly increased requirement of interrupting relatively lighter currents associated with the switching of capacitive kilovolt-amperes. This capacitive kilovolt-ampere requirement has manifested itself in long-distance high-voltage transmission li... View full abstract»

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  • II — Tesla's contribution to high frequency

    Publication Year: 1943, Page(s):355 - 357
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB)

    DURING the early part of the last decade of the 19th century the attention of the whole scientific world was challenged by Nikola Tesla's public demonstrations of the effects of high-frequency alternating currents. It was then very early in the commercial age of electricity. The incandescent light had not yet become commonplace, electric traction was just being introduced, and the controversy over... View full abstract»

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  • Semiconductor materials for thermoelectric power generation up to 700 C

    Publication Year: 1960, Page(s):450 - 459
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4013 KB)

    An investigation into the thermoelectric properties of semiconductor materials to uncover the feasibility of power-generating efficiencies at temperatures from 25 to 700 C. Discussion is centered on general considerations of efficiency factors leading to materials selection and some preliminary results in the evaluation of compound semiconductors and their solid-solution alloys. 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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  • Some experiments with peltier effect

    Publication Year: 1951, Page(s):589 - 591
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB)

    The Peltier effect has long been neglected by electrical engineers. Lately, however, experiments have been made on new alloys to determine the practicability of using the Peltier effect in a thermoelectric power generator. View full abstract»

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  • Percentage-differential transformer protection

    Publication Year: 1931, Page(s):361 - 363
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (415 KB)

    Three-winding transformers present difficult problems for the protection engineer. Differential relays which operate on the phase difference between the currents in the different windings are particularly adapted to meet the requirements. View full abstract»

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  • Applied solar energy library now in operation

    Publication Year: 1956, Page(s):769 - 770
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2473 KB)

    A library devoted exclusively to solar energy is now in operation at headquarters of the Association for Applied Solar Energy, 204 Heard Building, Phoenix, Ariz. View full abstract»

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  • Calculation of resistances to ground

    Publication Year: 1936, Page(s):1319 - 1328
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1988 KB)

    Formulas for practical use in the calculation of the resistances from grounding conductors of various forms to the earth are given in this paper and their use illustrated by examples. The accuracy of the formulas varies considerably, as discussed in the paper, but is sufficiently good that the methods should be helpful to those whose work involves problems of grounding. View full abstract»

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  • Methods to the prediction of phase behavior: Predicting phase behavior with digital computers

    Publication Year: 1951, Page(s): 047
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (298 KB)

    COMMERCIALLY AVAILABLE digital computing equipment of the punch-card type1,2 permits the expeditious direct application of relatively complex analytical expressions to the evaluation of the conventional thermodynamic properties of pure substances and mixtures. In the case of hydrocarbons, the Benedict equation3,4 is of particular utility in describing the effect of pressure, ... View full abstract»

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  • Power-system transients caused by switching and faults

    Publication Year: 1939, Page(s):386 - 396
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3725 KB)

    This paper summarizes the results of an investigation of transient voltages on power systems caused by switching and faults. The transient voltages on power systems as measured by the “klydonograph” are reviewed and compared with the flash-over values of transmission-line insulation. It is shown that the higher values of transient voltages are produced by intermittent arcs. In part I... View full abstract»

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  • Distribution transformer loading

    Publication Year: 1963, Page(s):136 - 139
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (819 KB)

    Load demand estimated from kilowatt-hour energy data has been adopted as the principle guide for installation or change-out of distribution transformers serving residential load at a large utility in Oregon. This article discusses the special problems connected with transformer loading, the technical considerations of a low-cost test program, and the step-by-step development of a kilowatt-hour gui... View full abstract»

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  • The audio noise of transformers

    Publication Year: 1941, Page(s):109 - 111
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    When transformers are installed near inhabited districts, their noise must be limited to unobjectionable values. Consequently, means of predetermining noise levels from the design constants of the transformer and means of noise reduction become necessary. It has been determined that the audio noise of transformers originates in the change in dimensions (magnetostriction) produced in the core steel... View full abstract»

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  • Effect of frequency on let-go currents

    Publication Year: 1943, Page(s):745 - 749
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (603 KB)

    This paper on electric shock covers the subject of sine-wave let-go currents for both men and women and contains an analysis which permits improved accuracy in predicting the response for large groups based on experiments made on a relatively small number of subjects. It should be of especial interest to persons who have had accidents in which they barely escaped “freezing” to an ele... View full abstract»

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  • Geometric mean distances for rectangular conductors

    Publication Year: 1946, Page(s):536 - 538
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (622 KB)

    THE USE of geometric mean distance for calculating reactance of parallel conductors is increasing, so much so that the self geometric mean distance often is tabulated in catalogs of heavy conductors along with other characteristics, such as resistance, current capacity, and weight. View full abstract»

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  • Dynamic braking of squirrel-cage induction motors

    Publication Year: 1954, Page(s): 162
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (274 KB)

    THE APPLICATION OF direct current to the stator of a 3-phase induction motor long has been recognized as a means of producing a retarding torque on the moving rotor. Methods have been given for evaluating the average braking torque, but a simple means for determining the complete speed torque curve during braking will be of value for the control engineer. View full abstract»

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  • Power-factor testing of transformer insulation

    Publication Year: 1941, Page(s):28 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (613 KB)

    This paper points out a method for analyzing the results obtained from dissipation-factor tests of transformer insulation. Experimental data, obtained both from transformer tests, extending over the past three years, and from tests of sample insulation, indicate a definite relation between resistance and capacitance, with varying conditions of temperature and moisture. This relation furnishes an a... View full abstract»

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  • Operating experience with Petersen coils on 66-kv system of Metropolitan Edison company

    Publication Year: 1939, Page(s):568 - 575
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5390 KB)

    THE Metropolitan Edison Company, operating in the eastern part of Pennsylvania, has a total of 264 miles of 66,000-volt overhead transmission lines, to which interconnections at this voltage with the systems of the Pennsylvania Water and Power Company and the Pennsylvania Power and Light Company add 59 miles, making a total of 323 circuit miles. A single-line diagram of this system is shown in fig... View full abstract»

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  • Electrical resistance to earth of a tree

    Publication Year: 1956, Page(s): 629
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (317 KB)

    LIVE TREES are frequently struck by lightning with varying degrees of injury, from bark wounds that may heal so well in a few years that unnoticeable scars are left — to splitting and shattering of the trunk or extreme blasting of the bark, that results in early death of the tree. It is well known in high-voltage laboratories that extremely dry wood is none too reliable for use in surge vol... View full abstract»

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  • Transactions: Papers and discussions comprising pages 663–712 of the 1938 volume: System analysis for Petersen-coil application

    Publication Year: 1938, Page(s):663 - 676
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4001 KB)

    Careful analysis of the characteristics of a power system has been found to be necessary before applying Petersen coils to a system which has been operating either with the neutral isolated or grounded. In these two companion papers on Petersen coils, accent has been placed on the analysis of system characteristics in order to determine whether or not the application of Petersen coils will be sati... View full abstract»

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  • Transformerreactance and losses with nonuniform windings

    Publication Year: 1934, Page(s):346 - 349
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2604 KB)

    A simplified method of calculating the reactance and eddy current losses of transformers with nonuniformly distributed windings is presented in this paper. The method has been in use for several years and has yielded highly satisfactory results. View full abstract»

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  • Electric circuit models of partial differential equations

    Publication Year: 1948, Page(s):672 - 684
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7735 KB)

    Electrical models of linear partial differential equations may serve several practical purposes: 1. If the networks are physically constructed, they actually may solve the equations within an accuracy of, say, one to five per cent, which is acceptable in many engineering applications. 2. If the networks are constructed only on paper, they supply a visualizable schedule of operations for the numeri... View full abstract»

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  • High-voltage testing techniques

    Publication Year: 1959, Page(s):589 - 595
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6182 KB)

    NUMEROUS TECHNIQUES for use in acceptance testing of apparatus have been developed over the past 25 years. It is not possible to cover, because of lack of space, the various devices that may be used in high-voltage laboratories for development work, except in a very general way. At the end of this article, a list of papers most easily accessible to American readers is included. In addition, rather... View full abstract»

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  • Per-unit impedances of synchronous machines

    Publication Year: 1945, Page(s):569 - 573
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1713 KB)

    THE ANALYSIS of synchronous machinery is dependent upon a correct and complete knowledge of the machine impedances. The progress of synchronous-machine analysis has been characterized by the recognition of an increasing number of rotor circuits and by an accompanying need for accurate numerical data on the impedances of these additional rotor circuits. The modern equivalent-circuit method of analy... View full abstract»

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  • Two-reaction theory of synchronous machines — Part II

    Publication Year: 1933, Page(s):44 - 45
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    RESULTS of certain mathematical investigations which have been found to be of practical use in the analysis of problems involving the transient behavior of interconnected machines are presented in this paper. View full abstract»

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  • Current-carrying capacity of acsr

    Publication Year: 1958, Page(s): 719
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    THE CONTINUOUS current-carrying capacity of transmission lines is dependent upon the allowable temperature of operation of the conductors. A great deal of test work has been performed in the investigation of this problem on ACSR (aluminum cable, steel reinforced). However, two factors—the effect of the sun and of the altitude of the line—have not received consideration heretofore. View full abstract»

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  • Dynamic strain measurement

    Publication Year: 1951, Page(s):675 - 678
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    Dynamic strain measurements are becoming increasingly important as the gap between safety and economy grows smaller in modern engineering design. The electrical methods described here are used for strain measurement under actual operating conditions. View full abstract»

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  • The rating and application of motors for refrigeration and air conditioning

    Publication Year: 1939, Page(s):519 - 527
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1901 KB)

    This paper describes the procedure and practical results to date in applying single-phase motors to refrigeration compressors. The applications are primarily torque applications, temperature considerations being of secondary importance. A line of high-torque motors has been developed to meet the high starting and accelerating torques demanded by the compressors. Utilization of these torques result... View full abstract»

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  • Electronic protective relays

    Publication Year: 1949, Page(s):122 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8893 KB)

    Although electromagnetic protective relays are adequate for present requirements, the ever-increasing demand for higher speeds and greater accuracy and dependability seems likely to exceed the capabilities of relays now available. However, the trend toward electronic control circuits in other branches of electrical engineering, coupled with the recent improvements in the design and manufacture of ... View full abstract»

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  • The electrostatic unbalance of transmission lines and its effect on the application of Petersen coils

    Publication Year: 1939, Page(s):107 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1428 KB)

    RECENTLY three Petersen coils were installed on the 66-kv transmission system of the Metropolitan Edison Company of Pennsylvania. These Petersen coils provide service protection to approximately 320 miles of overhead transmission lines against outages and voltage dips which would otherwise result when single phase-to-ground flashovers occur on the system. Much of the 66-kv transmission system cons... View full abstract»

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  • First report of power system stability

    Publication Year: 1937, Page(s):261 - 282
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4730 KB)

    The AIEE subcommittee on interconnection and stability factors∗ presents herein the first comprehensive review by an AIEE committee of the subject of stability, or successful parallel operation of a-c machines transmitting large blocks of power without loss of synchronism. A summary of principal installations made during the past 10 years which gives data on the various stability... View full abstract»

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  • Transformer magnetizing inrush currents and influence on system operation

    Publication Year: 1944, Page(s):366 - 374
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3710 KB)

    WHEN a transformer is energized, a transient current, known as magnetizing inrush current, generally flows for a short period of time until normal flux conditions are established. Under most practical system conditions, this current transient is of little consequence. However, in very rare cases a combination of circumstances may be obtained which results in this inrush being of such consequence a... View full abstract»

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  • New developments in current-transformer design

    Publication Year: 1940, Page(s):835 - 842
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5977 KB)

    VERY noteworthy progress has been made in recent years in the design of current transformers for medium and high voltages. Previously most current transformers were designed and built according to the same general practices as a small power transformer, and its size, weight, and general appearance was that of a conventional transformer. The latest current transformers, described below, scarcely re... View full abstract»

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  • Skin-effect bars of squirrel-cage rotors

    Publication Year: 1954, Page(s): 504
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    IN ORDER TO INCREASE the starting torque, larger induction motors are built usually with skin-effect bars in their rotor. Fig. 1 shows various types of skin-effect bars. Types A, B, and C, mostly type C, are used in induction motors; type D is used in synchronous motors. The analytical investigation of the increase of resistance and decrease of slot-leakage reactance of the skin-effect bars is pos... View full abstract»

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  • Starting performance of salient-pole synchronous motors

    Publication Year: 1940, Page(s):913 - 919
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1486 KB)

    IN recent years, two papers on the subject of salient-pole synchronous motors have been published in which practical methods for calculating the starting performance are derived on the basis of considerations that take into account all the unsymmetrics of this type of machine; the authors of these two papers are respectively H. V. Putman and T. M. Linville. Application of the Putman method gives a... View full abstract»

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  • Analysis of equivalent circuits

    Publication Year: 1932, Page(s):555 - 558
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1094 KB)

    Analysis of various circuit problems may be facilitated by the substitution of equivalent circuits which reduce the complexity and permit the replacing of magnetic coupling with simple impedance links so that the calculating board may be used for solution. In this article, general methods of solving the transformer, network, and zero phase sequence problems are presented along with useful diagrams... View full abstract»

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  • Skin-effect in bars of squirrel-cage rotors

    Publication Year: 1955, Page(s): 781
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (210 KB)

    BAR SHAPES are used in rotors of squirrel-cage motors for which a straightforward mathematical determination of the skin-effect is not possible. The solutions obtained for bar shapes, for which a straightforward mathematical solution is possible, indicate that the skin-effect is not affected by the actual width of the bar. This leads to the assumption that the “depth of penetration” ... 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