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Popular Articles (June 2016)

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  • 1. Lagoon of nations display

    Publication Year: 1940, Page(s):185 - 195
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  • 2. Inspection and tests of explosion proof motors

    Publication Year: 1936, Page(s):151 - 158
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4045 KB)

    Standards for inspection and test of electrical equipment for use in hazardous locations have been developed by the Underwriters' Laboratories. As the result of extensive research, considerable information has been made available on the explosion proof characteristics of motors and other electrical equipment in locations where there are highly flammable gases, volatile liquids, or other substances... View full abstract»

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  • 3. 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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  • 4. Two-reaction theory of synchronous machines — Part II

    Publication Year: 1933, Page(s):44 - 45
    Cited by:  Papers (2)
    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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  • 5. 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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  • 6. The role of HVDC in the electrical development of Canada

    Publication Year: 1963, Page(s):602 - 609
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5557 KB)

    The development of high-voltage converting equipment has spurred interest within the last decade in the technical and economic aspects of HVDC (high-voltage d-c) transmission. This article examines the economics of power transmission and those areas of electrical development in Canada where transmission by HVDC is a possible economic choice. The discussion requires some rather general groupings of... View full abstract»

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  • 7. Lightning strokes in field and laboratory — III

    Publication Year: 1941, Page(s):1248 - 1256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3460 KB)

    LIGHTNING research is classified here for convenience into three main divisions. First, there are the meteorological and physical processes which give rise to the lightning stroke proper. Second, we have the characteristics of the lightning stroke as these appear at the point of incidence of the stroke to electric lines, to protective systems, and to earth. And third, comes that branch of the art ... View full abstract»

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  • 8. Equivalent circuits for power-flow studies

    Publication Year: 1949, Page(s): 794
    Cited by:  Papers (7)
    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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  • 9. 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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  • 10. Effective resistance to alternating currents of multilayer windings

    Publication Year: 1940, Page(s):1010 - 1016
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3311 KB)

    IN any multilayer winding carrying an alternating current, such as the windings illustrated in figures 1, 2, and 3, each layer of copper lies in the alternating magnetic field set up by the current in all the other layers. Eddy currents are set up in each layer in a direction to partly neutralize the magnetic intensities in the interior of the copper wire in each layer. As a result of the eddy-cur... View full abstract»

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  • 11. 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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  • 12. 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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  • 13. 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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  • 14. Theory of hysteresis-motor torque

    Publication Year: 1940, Page(s):907 - 912
    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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  • 15. Axial magnetic forces on induction-motor rotors

    Publication Year: 1953, Page(s): 599
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (498 KB)

    IN AN APPLICATION where an induction motor is the driving unit, the electromagnetic force on the induction-motor rotor is a component of axial shaft thrust. The various factors which determine this force are discussed qualitatively and, with one exception, are evaluated in this article. View full abstract»

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  • 16. Ultrahigh-frequency loop antennas

    Publication Year: 1940, Page(s):843 - 848
    Cited by:  Papers (4)
    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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  • 17. Linear couplers for bus protection

    Publication Year: 1942, Page(s):241 - 248
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3210 KB)

    THE linear coupler transformer is a constant mutual reactance connecting the primary circuit to the relay. It introduces a new principle into the protective relaying art, a principle that is fundamentally sound and that eliminates completely, at its source, the most troublesome problem that has been standing in the way of simple high-speed bus protection. That problem is saturat... View full abstract»

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  • 18. Tensor analysis of rotating machinery

    Publication Year: 1933, Page(s): 51
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    IN ANALYZING the transient or steady state performance of any rotating machine a system of linear equations is set up for finding the currents, another system is set up for the torque, etc. The setting up of the equations is usually laborious and due to the accidental steps made in their solutions the final results are in a form that is difficult to interpret physically. A method is shown by which... View full abstract»

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  • 19. Hot-spot temperatures in dry-type transformer windings (44–103): Design and operating characteristics of modern dry-type air-cooled transformers (44–171)

    Publication Year: 1944, Page(s):1445 - 1448
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1418 KB)

    V. M. Montsinger (General Electric Company, Pittsfield, Mass.): The paper, “The Design and Operating Characteristics of Modern Dry-Type Air-Cooled Transformers,” is interesting and timely, and should be of value to the industry in that it gives some service tests and operating experience on the use of a high-temperature insulation in dry-type transformers having temperatures above 13... View full abstract»

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  • 20. Field investigations of lightning

    Publication Year: 1941, Page(s):1222 - 1229
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3005 KB)

    In the investigation described in this paper, measurements have been made and statistical data obtained on the multiple character and wave shape of the currents in direct strokes and the currents discharged by lightning arresters. These data, in conjunction with other data on the field performance of arresters, have revealed definite differences between the nature of direct strokes and the current... View full abstract»

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  • 21. 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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  • 22. 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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  • 23. The parallel type “inverter”

    Publication Year: 1932, Page(s): 263
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB)

    THE DEVELOPMENT of the thyratron or three-element hot-cathode gas-filled tube with grid-controlled arc has given electrical engineeing a new tool. Many interesting and valuable applications have been devised, among the most interesting of these being the “inverter.” Its purpose is the inversion or changing of direct current to alternating current, the reverse process of the more usua... View full abstract»

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

    Publication Year: 1937, Page(s):363 - 368
    Cited by:  Papers (1)
    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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  • 25. Grounding principles and practice I — Fundamental considerations on ground currents

    Publication Year: 1945, Page(s):1 - 13
    Cited by:  Papers (26)
    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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  • 26. 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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  • 27. 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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  • 28. 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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  • 29. Self-excitation of induction motors

    Publication Year: 1939, Page(s):47 - 51
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1643 KB)

    It has been known for some time that an induction machine whose rotor is driven mechanically may become self-excited if capacitors are connected across its terminals. The present paper is concerned with the predetermination of the machine characteristics when operating under such conditions. The frequency of excitation is very close to the synchronous frequency corresponding to the speed of the ro... View full abstract»

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  • 30. Processing mica paper for electrical insulation

    Publication Year: 1952, Page(s):463 - 465
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1297 KB)

    For more than a half century various improvements have been made in built-up mica insulation — splitting mica into thin films and cementing them together to form large sheets. A significant advance in micaceous insulation is the new continuous mica sheet described herein. View full abstract»

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  • 31. Abnormal voltage conditions in three-phase systems produced by single-phase switching

    Publication Year: 1941, Page(s):618 - 621
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (479 KB)

    Discussion and authors' closure of paper 40–105 by Edith Clarke, H. A. Peterson, and P. H. Light, presented at the AIEE summer convention, Swampscott, Mass., June 24–28, 1940, and published in AIEE TRANSACTIONS, 1941, pages 329–39. View full abstract»

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  • 32. Voltage notation conventions

    Publication Year: 1948, Page(s):41 - 48
    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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  • 33. 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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  • 34. Charging-current limitations in cable lines

    Publication Year: 1956, Page(s): 511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB)

    THE CAPABILITY of high-voltage cable lines to deliver power diminishes rapidly as the length of line increases. This is shown in Fig. 1 which is valid for the cable sizes commonly used for operation at 132 kilovolts and higher voltages. Rough approximations for general use may also be taken from these curves for 66-kv cables, but new curves would have to be prepared for greater than 15-per-cent ac... View full abstract»

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  • 35. Cell construction for current limiting reactors

    Publication Year: 1958, Page(s): 413
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (250 KB)

    FOR MANY YEARS, current-limiting reactor manufacturers have been showing on outline drawings dimensions for distance to magnetic materials. Instruction leaflets define magnetic materials as “… I-beams, channels, plates, and other steel structures hidden or exposed. Steel reinforcing rods not over 3/4 inch in diameter which do not form a complete electric circuit are not considered ma... View full abstract»

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  • 36. The philosophy of codes of ethics

    Publication Year: 1955, Page(s):916 - 918
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    The engineer's role in maintaining the integrity and efficiency of the productive process may seem so obvious a goal as not to require special representation by any profession. At the same time the engineer must be aware of the hidden subtleties of his mission and of its relationship to that of other callings. View full abstract»

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  • 37. Detection and measurement of nuclear radiation

    Publication Year: 1948, Page(s):325 - 332
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4006 KB)

    Methods of measuring nuclear radiation have been described meticulously in technical literature as they were developed. This summation should provide a good basis for the understanding of current and future literature describing specific instruments, newer refinements of the measurement technique, and nucleonics research. This is the fourth in a series of articles developed by the AIEE nucleonics ... View full abstract»

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  • 38. A distributed power amplifier

    Publication Year: 1950, Page(s):893 - 898
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (845 KB)

    FOR YEARS, a goal of the designer has been to increase the frequency response of vacuum-tube amplifiers. Considerable success has been achieved, with the design of the video amplifiers, in obtaining a frequency response from 30 or 40 cycles up to 4 or 5 megacycles. This is adequate for present-day television video requirements, but amplifiers with greater bandwidth are needed for many applications... View full abstract»

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  • 39. The growing importance of ethics to engineers

    Publication Year: 1958, Page(s):42 - 45
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1059 KB)

    Ethical standards change with the times, thus guiding the widely different ideals and needs of people into channels beneficial to all. Ethical conduct is the necessary middle road between man's natural inner pressure of selfishness and society's outer pressure for unselfish behavior. View full abstract»

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  • 40. Field disturbances produced by lightning

    Publication Year: 1943, Page(s):345 - 357
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2732 KB)

    THE present knowledge of the mechanism of natural lightning permits more accurate calculation of its electric and magnetic fields than has hitherto been possible. In a previous paper,1 the electric ground gradients for nearby strokes to earth were treated principally for the determination of the voltages induced on transmission lines by indirect strokes. In this paper the study is exten... View full abstract»

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  • 41. Insulator surface and radio effects

    Publication Year: 1934, Page(s):1213 - 1220
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4294 KB)

    Because of the rapid extension of police radio systems, and because both electric power lines and police cars occupy the highways, the problem of power line radio influence has acquired an added importance. Insulators coated with dirt, moisture, and hygroscopic salts have been found to cause radio disturbances at voltages much less than those for clean insulators. View full abstract»

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  • 42. Lightning phenomena: I — General characteristics

    Publication Year: 1941, Page(s):374 - 384
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4679 KB)

    Although Franklin conducted his famous lightning experiments about the middle of the 18th century, little more was learned until about a generation ago when lightning outages on expanding electric-power systems made an intensive study of the phenomena imperative. Many investigators in different parts of the world have studied lightning during that period, many special instruments have been devised... View full abstract»

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

    Publication Year: 1945, Page(s):92 - 99
    Cited by:  Papers (7)
    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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  • 44. Open-delta transformer banks — Analysis of circuit

    Publication Year: 1943, Page(s):292 - 296
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (418 KB)

    WHEN a three-phase transformer bank is operated in open delta, an unbalanced secondary voltage results, and the transformers themselves may be overloaded. The unbalanced voltage will cause a circulating current to flow which may cause overheating of the equipment in the secondary circuit to an extent depending upon the amount of the voltage unbalance and the load being carried. Wolf and Mattison View full abstract»

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  • 45. Permanent-magnet fields for synchronous machines — I

    Publication Year: 1953, Page(s): 246
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    PERMANENT-MAGNET generators have been built with ratings ranging from a few watts up to many kilowatts. Figure 1 shows a 0.1-kw rotor suspended from a 75-kva unit and even larger capacities and higher speeds are possible. The armature of permanent magnet alternators may be of conventional design, but the field structure is inherently different and in the last 6 years a rotor structure has been dev... View full abstract»

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  • 46. The doubly fed machine

    Publication Year: 1942, Page(s):286 - 289
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (818 KB)

    SYNCHRONOUS machines, operating with a-c excitation on both stator and rotor are used in many applications, for example, as induction frequency converters, as power and instrument Selsyn drives, and as variable speed power drives. Reference 1 has mentioned particularly the variable speed fan drive, and presented equations for the small oscillations of one such doubly fed machine. Reference 2 has a... View full abstract»

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  • 47. 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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  • 48. 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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  • 49. 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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  • 50. 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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Aims & Scope

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

Full Aims & Scope