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

  • Impulse generator circuit formulas

    Publication Year: 1934, Page(s):169 - 176
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1545 KB)

    With impulse voltage testing of electrical equipment becoming more widely used, it seems highly desirable to be able to calculate the circuit constants required to produce the desired test waves and to calculate the waves that any given circuit constants will give. In this paper the solution of the more commonly used impulse generator circuits is developed and summarized. Waves calculated by these... 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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  • Application of capacitors for power-factor improvement of induction motors

    Publication Year: 1945, Page(s):274 - 278
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2669 KB)

    POWER-FACTOR improvement of induction-motor loads by means of shunt capacitors has been a common practice for many years. Recently, the practice of connecting the capacitors directly at the motor terminals has developed in order to permit switching of the capacitors and motor as a unit. This will not result in adverse motor operation if the number of capacitors is selected properly. There is very ... View full abstract»

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  • High-frequency alternators

    Publication Year: 1954, Page(s):735 - 737
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (542 KB)

    High shaft speeds, which permit direct coupling of alternators to high-speed turbines, have made the largest contribution to the increased power ratings of alternators. Consequently, high-frequency alternators are becoming widely used in air-borne equipment. These alternators should find many other applications as in computer and telemetering systems, welding applications, and arc lighting. View full abstract»

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  • 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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  • 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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  • Effect of synchronous-machine transient rotor saliency

    Publication Year: 1955, Page(s): 123
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    IN most studies of power system disturbances made on the a-c network analyzer, the transient rotor saliency of the synchronous machines is neglected. The validity of this assumption is well established. However, in some cases it has been desirable to measure the variations in several of the bus voltages during the disturbance. When the bus is electrically near to a synchronous machine (in the limi... 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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  • Self-excitation of induction motors with series capacitors

    Publication Year: 1941, Page(s):1241 - 1247
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    INDUCTION motors with series capacitors connected in the supply circuit can under certain conditions become unstable. Upon application of the voltage the rotor will come up to partial speed and continue to rotate at this reduced speed. This phenomenon should not be confused with ferro-resonance which is accompanied by violent wave distortion, abnormally large magnetizing currents, and fluctuations... View full abstract»

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  • Steady-state stability of synchronous machines as affected by voltage-regulator characteristics

    Publication Year: 1944, Page(s):215 - 220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1414 KB)

    STEADY-STATE stability of synchronous machines is an old subject, and the fact that voltage regulators may on occasion increase the stability limit is more or less well known.1 The present paper, however, aims to contribute to the knowledge of the subject by: View full abstract»

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  • Iron and copper loss measurement in transformers

    Publication Year: 1958, Page(s): 402
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (289 KB)

    IT IS HIGHLY DESIRABLE to improve the accuracy of measurement of transformer iron and copper losses. Unless accurate measurements are available, it is difficult to evaluate the benefit of modifications in processes and constructions intended to reduce the winding eddy losses, stray losses in the tanks, and the iron loss. 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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  • 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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  • A high-performance elevator control system

    Publication Year: 1962, Page(s):187 - 193
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (18168 KB)

    The basic control loop for modern gearless high-speed elevators is discussed from the standpoint of a high-gain feedback control system. New transducers provide a rapid and smooth dynamic response. Accurate floor leveling is obtained by conversion from a velocity to a position-regulating system near the floor. Outstanding system performance has been demonstrated in tests of full-scale installation... View full abstract»

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  • Demonstration of the principles of the ultrasonic flowmeter

    Publication Year: 1954, Page(s):1082 - 1084
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1453 KB)

    By transmitting ultrasonic frequency both upstream and downstream between two fixed transducers, large volumes of a liquid can be measured with great sensitivity. The electronic apparatus used is not complicated and velocity of the liquid can be determined with a precision of one per cent. View full abstract»

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  • Control system synthesis by Root Locus method

    Publication Year: 1950, Page(s): 405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (301 KB)

    THE ROOT LOCUS method solves the problem of finding the roots of the characteristic equation by an extension of concepts now associated with the frequency-response method. The roots describe the natural response of the system, and knowing them permits a solution for any input. Consider a simple single-loop system, shown in Figure 1, for convenience in developing a physical picture. View full abstract»

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  • Powder metallurgy

    Publication Year: 1942, Page(s):468 - 475
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8002 KB)

    Modern powder metallurgy has two principal uses: the cheap and efficient mass production of machine parts that do not require high strength, and the creation of alloys with special properties. Both uses are described and the development of the process is reviewed. View full abstract»

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  • Steady state solution of saturated circuits

    Publication Year: 1935, Page(s):728 - 734
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1488 KB)

    Methods of steady state power calculation developed specifically for: (1) systems having more machines than can be handled conveniently by existing methods; and (2) systems consisting of a line with magnetically saturated synchronous machines at both ends are outlined in this paper. Two general methods are given: (1) that involving the use of equivalent reactance or impedance, and (2) that involvi... 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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  • Ultrahigh-frequency loop antennas

    Publication Year: 1940, Page(s):843 - 848
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1716 KB)

    ANTENNAS which are discussed in this paper were developed for two applications: (1) to serve as elements in radiating systems of localizers and radio ranges used to guide aircraft; (2) to act as receiving antennas carried by aircraft. View full abstract»

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  • An Application of operations research in the power field

    Publication Year: 1954, Page(s):655 - 658
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (710 KB)

    The science of operations research and the tremendous advances in machine computation are two recent developments which are being utilized effectively in an analysis of an economy loading study of hydro-thermal electric systems. This research program is being sponsored by the Bonneville Power Administration at the Massachusetts Institute of Technology. View full abstract»

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  • Detection of slot surface discharges in high-voltage machine stator windings

    Publication Year: 1952, Page(s):143 - 147
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3617 KB)

    Basic studies of the nature and method of detecting slot discharge phenomena in high-voltage stator windings show that the discharge is a result of loss of electric contact between conducting coil surfaces in the slot and the core. Several methods were studied for detecting and locating such discharges and the development of a slot discharge analyzer is described. 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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  • High-gain side-firing helical antennas

    Publication Year: 1954, Page(s): 896
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    THE ADVENT of ultrahigh-frequency television broadcasting has accelerated development of antennas in the 500-to 1,000-mc range which direct most of the radiated energy within a few degrees of the horizon. A helically wound coil and coaxial conducting cylindrical mast has been developed which will so radiate, while giving essentially uniform patterns in a horizontal plane. 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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  • Interlamination resistance

    Publication Year: 1944, Page(s):670 - 671
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    IN laminated-core structures for transformers and rotating machines the need for adequate interlamination resistance becomes more necessary as the core structure increases in size. Where considerable pressures are exerted on the core laminations, a safe value of interlamination resistance must be maintained to prevent the stray losses in the core from becoming excessive. A method for determination... View full abstract»

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  • New developments in potential-transformer design

    Publication Year: 1943, Page(s):483 - 487
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1155 KB)

    This paper describes certain design ideas applied to potential transformers to accomplish substantial reductions in volume and weight, with improved reliability and with better accuracy than the best requirements of the American Standards. The size of these units is such that they appear mostly as bushings. Perhaps the most striking feature of construction is the arrangement and the insulation of ... View full abstract»

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  • A portable instrument for measuring insulation resistance at high voltage

    Publication Year: 1945, Page(s):164 - 166
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2184 KB)

    THERE has been an increasing trend toward measuring insulation resistance of high-voltage machines and cables at or above their rated voltage by the use of direct current. The advantage of high voltage lies in its ability to detect leakage paths which do not occur at lower voltages.1 D-c tests are advantageous because of the elimination of capacitance-current effects. Since the resistan... View full abstract»

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  • Theory of hysteresis-motor torque

    Publication Year: 1940, Page(s):907 - 912
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1493 KB)

    THE object of this study is the development of a quantitative theory of hysteresis-motor torque, especially in relation to magnetic properties and dimensions. The theory is interpreted physically in an idealized case, and applied to a particular motor to verify the result experimentally. View full abstract»

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  • Automatic control for washing machines

    Publication Year: 1942, Page(s):89 - 92
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2563 KB)

    IN 1940 the American people spent $113,580,000 to buy 1,552,666 household washing machines. That is big business! But the only way the washing-machine industry could become a big business, and the only way it can remain a big business, is by supplying machines that fulfill the users' actual needs and desires. In practice, this means that the industry must anticipate by several years what features ... View full abstract»

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  • Magnetic ferrites: New materials for modern applications

    Publication Year: 1954, Page(s):726 - 729
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (667 KB)

    Ferrites are serving very effectively in the vanguard of communication developments. Their basic properties and methods of application are discussed which show how they have begun to revolutionize the design and manufacture of inductors and transformers. View full abstract»

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  • Tunnel diode operation and application

    Publication Year: 1960, Page(s):270 - 277
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5887 KB)

    The tunnel diode offers significant physical and electrical advantages over conventional semiconductor devices. Its impact on future transistor technology is evaluated in the light of these advantages. View full abstract»

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  • Radar interference to microwave communication services

    Publication Year: 1958, Page(s):916 - 921
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2296 KB)

    Interference between radar transmitters and microwave communication systems is a grewing problem complicated by the fact that the fermer use power outputs of megawatts, whereas microwave transmitters use power outputs of 10 watts or less. Urgent measures are required to permit these radio services to co-exist in the microwave spectrum. View full abstract»

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  • Heating of nonmagnetic electric conductors by magnetic induction — Longitudinal flux

    Publication Year: 1944, Page(s):273 - 278
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1532 KB)

    HEAT can be generated in a piece of metal or other conducting material by wrapping a coil around the piece, such as the cylinder shown in Figure 1, and causing a current of suitable magnitude and frequency to flow into the coil. This is called “induction heating.” The great advantage of this type of heating is that the heating can be accomplished without contacting the piece to be he... View full abstract»

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  • Resistance and capacitance relations between short cylindrical conductors

    Publication Year: 1945, Page(s):724 - 729
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1230 KB)

    THE CONVENTIONAL FORMULA for computing capacitance or conductance between parallel cylindrical conductors is derived on the assumption that the electrostatic or current flux between conductor surfaces is confined to paths lying in planes perpendicular to the axes of the conductors. 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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  • Closed-loop frequency response of nonlinear systems

    Publication Year: 1957, Page(s): 804
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    WHEN A NONLINEAR feedback control system includes saturation, the output of the system may oscillate with either the input frequency or the l/n order subharmonic of the input frequency, where n is a positive integer greater than l. When the frequency of the output is l/n times that of the input, the output oscillation is called the l/n order pure subharmonic oscillation. The possibility of the occ... View full abstract»

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  • Subtransient reactances of synchronous machines

    Publication Year: 1959, Page(s): 1183
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    THE THEORETICAL approach so far made in the development of formulas for the direct- and the quadrature-axis subtransient reactances is based on either proportioning the current in the pole-tip bar, depending on its permeance, or evolving an equivalent damper winding on the assumption of sinusoidal distribution of damper currents. Both these methods have their limitations when applied to the case o... 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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  • Arcing time of high-voltage air-break contactors

    Publication Year: 1953, Page(s): 589
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    A HIGH-VOLTAGE AIR-BREAK contactor must be able to interrupt the circuit to motor loads or static loads covering a wide current range. Considerable attention has been given to the ability of contactors to interrupt fault currents, but little has been published on the problem of obtaining satisfactory performance at low currents. The difficulty at low currents is one of getting acceptably short arc... View full abstract»

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  • Harmonic-current-restrained relays for transformer differential protection

    Publication Year: 1941, Page(s):377 - 382
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2000 KB)

    Differential protection, employing percentage-differential relays, has1 long been the accepted method of fault protection for large power transformers. This method, illustrated by the schematic diagram, figure 1, is quite satisfactory in most respects but is subject to false tripping on the transient magnetizing-inrush current which flows when the transformer is energized. This current,... View full abstract»

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  • Dielectric strength of mineral oils

    Publication Year: 1935, Page(s):50 - 55
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1298 KB)

    The correlation of the pressure and temperature effects in determining the dielectric strength of mineral insulating oils is considered in this paper. The effect which gas dissolved in the oil has on the dielectric strength of the oil is shown by experimental results of tests on the effect of temperature and pressure. Based upon these results, simple formulas for expressing the dielectric strength... View full abstract»

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  • Induction and dielectric heating

    Publication Year: 1948, Page(s): 847
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB)

    Induction and dielectric heating have assumed in recent years an important position in industrial heating; dielectric heating more recently than induction. These unique forms of heating, once responsible only for power losses in electric equipment and machinery, offer many advantages over conventional means of heating by convection, conduction, and radiation. The field of application is very broad... View full abstract»

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  • Grounding principles and practice III — Generator-neutral grounding devices

    Publication Year: 1945, Page(s):92 - 99
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2172 KB)

    Characteristics of devices for grounding the neutrals of synchronous generators and the conditions under which the various types of devices are used and their effect on associated equipment are discussed in this article, the third in a series of five based on lectures which were sponsored by the power and industrial group of the AIEE New York Section during the 1943–44 season. View full abstract»

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  • Approximating Potier Reactance

    Publication Year: 1937, Page(s):813 - 818
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1490 KB)

    POTIER REACTANCE is a somewhat fictitious reactance, because it is a combination of reactance, change of saturation, and change of flux form. Nevertheless, it is sometimes a rather useful fictions-cause it can be easily tested, and because it can be used to obtain full load field currents of synchronous machines when only the no-load saturation curve is available. It is also useful for determining... View full abstract»

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  • Léon charles thévenin: (1857–1926)

    Publication Year: 1949, Page(s):843 - 844
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2326 KB)

    Although Thévenin's theorem is used extensively, particularly by communication engineers, little is known of the man himself. This article, translated from the journal of the Administration of Posts, Telegraphs, and Telephones with which Thévenin was associated, outlines some of the highlights of his career. View full abstract»

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  • The wound-core distribution transformer

    Publication Year: 1938, Page(s):622 - 625
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (15895 KB)

    IN THE very early days of the development of a-c transformers, various methods were tried to produce cores which would have the necessary characteristics of low loss, low magnetizing current, and suitable mechanical arrangements. It was very soon found that the most practical form of raw material was thin iron or iron-alloy sheet which could be obtained with relatively low hysteresis loss, and cou... View full abstract»

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  • The use of multiwinding transformers with synchronous condensers for system voltage regulation

    Publication Year: 1940, Page(s):212 - 217
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3034 KB)

    THREE-WINDING transformer banks offer a convenient and economical means, and are frequently used, for operating synchronous condensers at step-down substations, particularly where the secondary voltage is too high for direct operation of the condenser. The usual function of the condenser in such cases is to regulate the secondary voltage, and the condenser regulator is controlled from that voltage... View full abstract»

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  • Electrical engineering aspects of nuclear reactor safety

    Publication Year: 1963, Page(s):374 - 381
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB)

    Nuclear reactor safety requirements are extremely rigorous and uncompromising. Strict reactor criteria can he satisfied only if the reactor power supply and control system meet a similar set of criteria. The problems arising in the electric network when these criteria are applied to a dual-purpose reactor supplying steam to a large electric power generating plant are discussed. The Hanford new pro... View full abstract»

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  • New devices and standards in packaging machinery viewed

    Publication Year: 1962, Page(s):569 - 570
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1382 KB)

    Rapid progress in electrical and electronic controls for packaging machinery and in the proposed standards that will govern their use was revealed to nearly 100 engineers from electrical and packaging industries at the technical conference of the AIEE Packaging Industry Subcommittee in Atlantic City, N. J., on May 7–8. 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