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

  • 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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  • 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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  • A symbolic analysis of relay and switching circuits

    Publication Year: 1938, Page(s):713 - 723
    Cited by:  Papers (3)
    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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  • 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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  • 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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  • Frequency changers — Characteristics, applications, and economics

    Publication Year: 1945, Page(s):351 - 358
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3105 KB)

    FREQUENCY CHANGERS have been discussed at various times during the past 20 years.1,2 At the 1944 AIEE summer technical meeting there was presented a thorough analysis of the design and operating characteristics of a new 20,000-kw electronic frequency changer.3–7 Its installation, together with increasing interest in railroad electrification for the immediate postwar pe... 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 (6)  |  Patents (1)
    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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  • Sliding contacts — A review of the literature

    Publication Year: 1953, Page(s):912 - 917
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1009 KB)

    The literature on sliding contacts is reviewed with emphasis placed on basic phenomena. The subject is covered under the headings of contact wear, contact configuration, contact resistance, generated noise, contact force, and contact surfaces. Each of these factors is evaluated in terms of its effect on sliding contacts. Recommendations for improving sliding contacts also are included. 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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  • Induction motor speed-torque-current curves

    Publication Year: 1954, Page(s): 705
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (190 KB)

    A METHOD OF ANALYZING the induction motor speed-torque-current curves as a function of voltage is presented in this article. It is shown that the current will vary differently from the first power of the voltage; and the torque differently from the square of the voltage. The results obtained from any individual test are applicable to a specific design and cannot be considered as the correct soluti... 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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  • Voltage notation conventions

    Publication Year: 1948, Page(s):41 - 48
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2078 KB)

    A critical analysis of voltage conventions and double subscript notations reveals that great confusion in electrical engineering literature is caused by the lack of uniformity in designating voltages and potential differences. A possible set of standards is offered for consideration. View full abstract»

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  • Modern trends in the design of vertical water wheel generators

    Publication Year: 1951, Page(s):887 - 892
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (5234 KB)

    Progress in water wheel generator design is marked by improved reliability, greater compactness, and easier maintenance. Both umbrella-type and enclosed generators are still widely used, while underground and outdoor stations are becoming increasingly popular. Some design and construction problems of these generators are discussed. 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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  • Electric power for jet-engine research

    Publication Year: 1952, Page(s):118 - 123
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (5052 KB)

    Jet-engine and rocket research facilities put some severe and unusual demands on the electric power supply system. The distribution system of the NACA's Lewis Flight Propulsion Laboratory, where several large wind tunnels and other heavy equipment must be supplied, is described in this article. 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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  • The delta-grounded transformer

    Publication Year: 1954, Page(s): 156
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (267 KB)

    MANY DISTRIBUTION SYSTEMS are fed essentially from one high-voltage system through transformation. It is sometimes desirable to ground both systems at the substation which is the main source of supply to the distribution system. This grounding problem may be solved by using either a Y-Y-delta transformer with a tertiary delta winding or a conventional Y-delta bank with a separate grounding transfo... View full abstract»

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  • Unsymmetrical short circuits on water-wheel generators under capacitive loading

    Publication Year: 1937, Page(s):1385 - 1395
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (12757 KB)

    WATER-WHEEL GENERATORS without damper windings under capacitive load may have abnormally high voltages developed across their terminals at limes of unsymmetrical short circuits. These voltages are due to 2 causes. First, the difference in permeance of the magnetic circuit in the direct and quadrature axes produces, under unsymmetrical short circuits, distorted voltages which have high peak values ... 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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  • Measurement of rotor displacement angle

    Publication Year: 1958, Page(s): 1019
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (229 KB)

    THE ROTOR DISPLACEMENT ANGLE plays an important role in the operation of a synchronous machine, because the power output and stability of the machine depends on it. This angle may be determined by calculation or measurement. The known methods of the direct measurement are applicable only during tests on synchronous machines. A new method for the measurement of the rotor displacement angle under no... View full abstract»

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  • The electric discharge of the electric EEL

    Publication Year: 1950, Page(s):145 - 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1424 KB)

    THE ELECTRIC EEL, Electrophorus electricus, delivers the most powerful electric discharge of any electric fish. In addition, it breathes air and can therefore be kept out of water for long periods of time. For these reasons it has proved ideally suitable for the pursuing study of “animal” electricity. View full abstract»

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  • Substation 1-line diagrams

    Publication Year: 1953, Page(s):998 - 1002
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (840 KB)

    The scope of this article was to investigate the basic primary circuit electrical configurations for transmission and distribution substations. This study was made broad because, until voltage ratings have been assigned to the circuits in a substation diagram, it represents equally well the lowest to the highest voltage circuits. View full abstract»

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  • Grounding principles and practice I — Fundamental considerations on ground currents

    Publication Year: 1945, Page(s):1 - 13
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3107 KB)

    This article is the first of five based on a series of lectures which was sponsored by the power and industrial group of the AIEE New York Section during the 1943–44 season. The behavior of currents flowing in the earth, as influenced by the resistivity of the soil, frequency of the current, and size and shape of electrodes, is analyzed here. 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 (6)
    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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  • Supermendur: A new rectangular-loop magnetic material

    Publication Year: 1957, Page(s):208 - 211
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3691 KB)

    Characteristics of Supermendur, a new vanadium-iron-cobalt alloy with exceptional magnetic properties, are discussed. Advantages include low coercive force, low hysteresis loss, high permeability, and high remanence. This material promises to be of value in telephone receiver diaphragms, miniaturization, high-temperature applications, and switching and memory devices. 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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  • Design of permanent-magnet alternators

    Publication Year: 1951, Page(s): 991
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (355 KB)

    PERMANENT-MAGNET alternators have been used for many years in small-sized units such as tachometer generators, governor frequency sources, and magnetos, but until recently have not been adopted widely as primary sources of power. With the development of dispersion-hardening alloys typified by the Alnico family and their application to rotating machinery, the permanent-magnet alternator has assumed... 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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  • Equivalent circuits of the shaded-pole motor

    Publication Year: 1951, Page(s): 506
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    EQUATIONS AND equivalent circuits are developed for the shaded-pole motor, including the space-harmonics introduced by the stator windings. Uneven air gap, also excitation on the shaded pole, are assumed, while the parameters include the angle of shift and the ratio of turns. The equations and equivalent circuits cover both the cross-field and the revolving-field theories. View full abstract»

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  • The direct- and quadrature-axis equivalent circuits of the synchronous machine

    Publication Year: 1945, Page(s):861 - 868
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (2608 KB)

    THE EQUIVALENT-CIRCUIT method of analysis is a tool of unquestioned competence in the solution of machine and system problems involving a number of simultaneous equations. Its efficacy in obtaining practical results has been demonstrated in many diverse applications. In particular, the complete equivalent circuit of the synchronous machine — complete in the sense that the field-winding circ... View full abstract»

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  • A 3-million-kva short-circuit generator

    Publication Year: 1963, Page(s):195 - 199
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3559 KB)

    The need for an additional 3 million kva of short-circuit capacity for a new circuit breaker laboratory was met by the construction of a 3,600-rpm generator with very low reactance. The general philosophy of designing for low reactance, which led to the two-pole design, is discussed and the various electrical and mechanical features of the generator are described View full abstract»

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  • The “thyratron” motor

    Publication Year: 1934, Page(s):1517 - 1523
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4148 KB)

    A new type of motor in which a scheme involving electronic tubes is used to perform a function similar to that of a commutator is described in this paper. The motor operates at variable speed and is supplied from a 3-phase power system. A 400-hp motor of this type has been built and is ready for commercial use. 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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  • Analysis of series capacitor application problems

    Publication Year: 1937, Page(s):975 - 988
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (4538 KB)

    IN THE past several years series capacitors for the compensation of line drop in power circuits have found increasing use,1–9 because improved and automatic voltage regulation can, in many cases, be obtained more economically by this method than by any other means. View full abstract»

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  • The brain computing machine

    Publication Year: 1949, Page(s):492 - 497
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3005 KB)

    The author, a medical doctor, employs electrical engineering terminology to show how the brain may be likened to a digital computing machine consisting of ten billion relays called neurons. To carry the analogy further, the performance of the brain is governed by inverse feedback, subsidiary networks secure invariants, or ideas, predictive filters enable us to move toward the place where the objec... View full abstract»

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  • Performance characteristics of speed governors

    Publication Year: 1949, Page(s): 198
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (538 KB)

    THE PERFORMANCE CHARACTERISTICS of speed governors on automatic extraction turbines as related to the performance characteristics of governors on straight condensing and noncondensing extraction turbines are affected by the characteristics of the turbines themselves. “Steady state regulation” and “overspeed” may require either special treatment or additional mechanism i... View full abstract»

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  • Electronic recording instruments: A brief history

    Publication Year: 1947, Page(s):36 - 37
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (327 KB)

    AUTOMATIC RECORDING of various phenomena is being used more and more each day and is spreading to all fields of industry. During the war, automatic recording and controlling methods were one of the main factors that enabled this country to far surpass the production efforts of all other nations. The atomic bomb would not have been possible without the recorders and controllers that were so essenti... View full abstract»

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  • Application of the ohm and mho principles to protective relays

    Publication Year: 1946, Page(s):378 - 385
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1692 KB)

    THE mho relay unit was first used 15 years ago as the directional unit for an early-type reactance relay. Thus it can be said that “mho” applied to relays is a new term applied to an old principle. The mathematical justification for the term has been given in a paper1 describing the use of the mho unit in a carrier-current relaying scheme. The mho unit in its present form ... View full abstract»

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  • Sag and tension calculations for cable and wire spans using catenary formulas

    Publication Year: 1945, Page(s):984 - 987
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1511 KB)

    Discussion and author's closure of paper 45–144 by John F. Nash and John F. Nash, Jr., published in AIEE TRANSACTIONS, 1945, October section, pages 685–92. View full abstract»

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  • Per-unit impedances of synchronous machines — II

    Publication Year: 1945, Page(s):839 - 841
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1086 KB)

    THE preceding part1 of this paper derived the generalized per-unit equations of the synchronous machine. The machine impedances were divided into two groups: those measurable from the stator terminals (xd, xd′, r, and so forth) called the definitive impedances, and those internal impedances which cannot be measured from the stator terminals (Xafd,... 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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  • 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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  • Two-phase A-C servo motor operation

    Publication Year: 1952, Page(s): 924
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (442 KB)

    MANY PRESENT-DAY servo systems employ the 2-phase induction motor as the electromechanical energy conversion member. Common practice is to supply one phase from a suitable constant-voltage source while the pertinent control information is carried in the form of the voltage magnitude variation impressed on the second or control winding. This voltage is maintained displaced at 90 degrees from the ma... View full abstract»

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  • Transmission line load impedance for maximum efficiency: Calculating transmission-line load impedance

    Publication Year: 1951, Page(s): 128
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (358 KB)

    THE ratio of sending-end to receiving-end power for a transmission line, or other 4-pole apparatus, is View full abstract»

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  • Some experiments with peltier effect

    Publication Year: 1951, Page(s):589 - 591
    Cited by:  Papers (1)
    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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  • On eddy currents in a rotating disk

    Publication Year: 1942, Page(s):681 - 684
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (994 KB)

    A DEVICE which often occurs in electric machines and instruments consists of a relatively thin conducting disk rotating between the pole pieces of a permanent magnet or electromagnet. The author has received inquiries as to the method of calculating the paths of the eddy currents and the torque in such cases. The following rather simple method, which is quite accurate for a permanent magnet, seems... View full abstract»

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  • I — Tesla's contribution to electric power

    Publication Year: 1943, Page(s):351 - 355
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1341 KB)

    FARADAY'S principle of electromagnetic induction discovered in 1831 after some 40 years of incubation resulted in practical forms of dynamo machines. Electricity from mechanical power (instead of costly batteries) stimulated invention of apparatus and the development of various methods or “systems” for distributing and utilizing the electric current. The evolution of “systems&... View full abstract»

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  • Theory of hysteresis-motor torque

    Publication Year: 1940, Page(s):907 - 912
    Cited by:  Papers (3)
    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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  • Ultrahigh-frequency loop antennas

    Publication Year: 1940, Page(s):843 - 848
    Cited by:  Papers (6)
    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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Aims & Scope

This Periodical ceased publication in 1963. The current retitled publication is IEEE Spectrum.

Full Aims & Scope