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Power Apparatus and Systems, IEEE Transactions on

Issue 7 • Date Sept. 1970

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Displaying Results 1 - 25 of 44
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1970 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Power Group

    Publication Year: 1970 , Page(s): c2
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    Freely Available from IEEE
  • Diakoptics and Piecewise Methods

    Publication Year: 1970 , Page(s): 1373 - 1382
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1682 KB)  

    Limitations on both high-speed core available and computer running time required for solving large-scale power system problems are very serious restrictions that continually confront the power system analyst. Piecewise methods, or methods of tearing as they are also called, hold much promise for the solution of such large scale problems. In this paper, new piecewise methods and algorithms are derived. Variations of these algorithms for practical applications are developed. Both boundary iteration as well as diakoptic methods are described. The major emphasis of this paper is placed on the latter method. The use of elimination and triangular factorization techniques within the piecewise methods is also indicated. View full abstract»

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  • The Systems Concept in Generating High-Voltage Impulses

    Publication Year: 1970 , Page(s): 1383 - 1387
    Cited by:  Papers (5)
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    The interaction of the measuring system with an impulse -generating system is analyzed. The analysis shows that impulses of simple form cannot be obtained because of the generator impedance. The distortion of the impulse has significant effects on the measurement. View full abstract»

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  • Transient Impedance of High-Voltage Impulse Generating Systems

    Publication Year: 1970 , Page(s): 1387 - 1393
    Cited by:  Papers (7)
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    The interaction between an impulse generating system and an impulse measuring system is dependent on the reflections that occur at the generator and divider ends of the measuring system lead. In this paper the impedances that cause these reflections are studied and discussed. The effects of the interactions are illustrated with sample oscillograms. View full abstract»

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  • Calibration and Checking Methods of Rapid High-Voltage Impulse Measuring Circuits

    Publication Year: 1970 , Page(s): 1393 - 1403
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2230 KB)  

    Errors in high-voltage impulse measurements are classified as scale factor errors and errors due to limitations in response characteristics. Running work within the International Electrotechnical Commission (IEC) gives tentative requirements intended to keep the mentioned errors within reasonable limits. The theoretical basis of these requirements is presented and checked against some practical cases. View full abstract»

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  • A Capacitive Voltage Divider for UHV Outdoor Testing

    Publication Year: 1970 , Page(s): 1404 - 1412
    Cited by:  Papers (1)
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    A design for a UHV capacitive voltage divider for outdoor use, suitable for full-wave and switching-surge impulse voltage measurements, is described. Model studies, mechanical features and design of the low-voltage arm of the divider are examined. A calibration procedure is outlined, and the results of this are given. Results of tests under working conditions show that a satisfactory design has been achieved, giving a very short rise time and a high, voltage ratioaccuracy. View full abstract»

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  • Dynamic Measurements of Arc Temperature Distribution, Radius, and Current in a Pulsed Coaxial Plasma

    Publication Year: 1970 , Page(s): 1413 - 1419
    Cited by:  Papers (3)
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    Spectroscopic techniques, in synchronization with a high-speed rotating mirror arrangement, have been employed to determine the dynamic response characteristics of a well-stabilized coaxial arc plasma subjected to a step pulse in voltage; data acquisition time is about 5 ¿s. Experiments were conducted in argon at 1.1 atmospheres pressure with mass flows of 0.107, 0.157, and 0.206 grams per second. Radial distributions of temperature were obtained at various times during the transient. The timewise variation of arc radius was also determined. View full abstract»

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  • Aging of Oil-Filled Cable Dielectrics

    Publication Year: 1970 , Page(s): 1420 - 1428
    Cited by:  Papers (1)
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    A description of aging stability for self-contained oil- filled cable dielectrics is given. The power factor of oil-filled cable dielectrics over an extended period and the dielectric properties of low-pressure self-contained oil-filled cable withdrawn from service were studied in the laboratory. From the test results, the authors suggest that the increase in the power factor of oil-filled cable after long use is mostly attributable to the deterioration of the mineral insulating oil. This conclusion clearly differs from the results reported in [1] and [6]. View full abstract»

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  • A Power-Cable Temperature Monitoring System

    Publication Year: 1970 , Page(s): 1429 - 1433
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3256 KB)  

    A novel device capable of monitoring the sheath temperature of underground power cables and indicating isolated hot spots is described. The novelty is in the hot-spot detecting principle, which is based on the use of a thin liquid-filled coaxial sensing cable attached to the power cable. A hot spot causes the liquid within the sensing cable to boil, forming a vapour bubble, the latter being detected by means of a pulse-echo radar method. Design features of the device and a trial installation are described, indicating the maximum operating range to be 1400 feet and the nominal response temperature 75°C. View full abstract»

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  • Hydraulic Method for Locating Oil Leaks in Underground Cables

    Publication Year: 1970 , Page(s): 1434 - 1439
    Cited by:  Papers (4)
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    The development and use of a hydraulic method for locating oil leaks in underground cables is described. The method is applicable at cable terminals, and its overall accuracy in determining the distance to the leak is estimated to be within ±2 percent of the cable length between reservoirs or between a reservior and the nearest stop joint. View full abstract»

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  • Location of Leaks in Gas-Filled Underground Cables

    Publication Year: 1970 , Page(s): 1440 - 1443
    Cited by:  Papers (1)
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    A new halogen detector having excellent sensitivity and selectivity has been developed for the purpose of locating leaks in gas-filled underground cables. This detector has been in field use for about four years and a number of gas leaks have been located without difficulties. View full abstract»

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  • Operation of Lightning Arresters on Abnormal Power Frequency Voltages

    Publication Year: 1970 , Page(s): 1444 - 1454
    Cited by:  Papers (8)
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    Lightning arresters have historically been restricted in usage to operating voltages which are equal to or less than the arrester rated voltage as determined by the standard duty cycle test. This results in application limits which are unnecessarily conservative when considering the modern current-limiting gap station arrester.1 The current-limiting gap arrester has inherent overvoltage capability, and, through specific tests, it is possible to evolve application rules which allow use of these specific arresters on transient power frequency voltages above the standard arrester voltage rating. View full abstract»

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  • Estimating the Switching-Surge Performance of Transmission Lines

    Publication Year: 1970 , Page(s): 1455 - 1469
    Cited by:  Papers (21)
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    From the results of an ANACOM study to investigate the frequency function of the occurrence of a switching surge, a simplified method to estimate the switching-surge flashover probability of a transmission line is developed and presented in a series of curves. View full abstract»

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  • A Comparison Between Two Different Designs of Bare Single-Layer Steel-Reinforced Aluminum Conductor

    Publication Year: 1970 , Page(s): 1470 - 1474
    Cited by:  Papers (3)
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    Two different designs of bare single-layer steel- reinforced aluminum conductor are examined both by theoretical techniques and by experimental methods. An approximate model is developed which uses a new approach for solution for impedances of such conductors. A comparison between two different commercial designs is effected with the aid of the model, and the results are evaluated in the light of experimental evidence. Suggestions are made for comparing conductor designs and also for the improvement of designs. View full abstract»

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  • Estimate of Forces Exerted Against Spacers When Faulty Condition Occurs

    Publication Year: 1970 , Page(s): 1475 - 1484
    Cited by:  Papers (2)
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    Certain problems exist concerning spacers in bundle transmission lines. The issues involve forces caused by fault current, hybrid fluttering (galloping) of the bundle, vibration, etc.; other problems such as the wear, fatigue, and relaxation of the materials used over a period also arise due to these forces. Because the existing literature on forces exerted during a fault event are concerned only with specific conditions, it is difficult to predict the force applied for an entirely different condition. The summarized analysis described here has been developed to predict forces exerted against spacers caused by fault conditions by using common basic calculations; experimental data, including those of the author, are provided for comparison to support the estimates made. View full abstract»

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  • Determination of Transmission Line Ampacities by Probability and Numerical Methods

    Publication Year: 1970 , Page(s): 1485 - 1492
    Cited by:  Papers (11)
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    The determination of transmission line ampacities using a statistical approach has been studied at the University of Saskatchewan [6]. This paper describes a method of statistically representing the weather elements by the method of moments and the Pearson family of curves. A digital method of determining the permanent loss of tensile strength due to annealing is also described. These two methods are combined and used to determine the conductor ampacity for selected assumed load patterns. View full abstract»

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  • Transient Current Capacity of Aluminum-Clad Steel Ground Wires

    Publication Year: 1970 , Page(s): 1493 - 1498
    Cited by:  Papers (2)
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    In transmission systems in which a large inducing current flows into the overhead ground wires during short-circuit faults, it is essential that these wires have high conductivity. Aluminum alloy conductors, steel reinforced, have been used in the past. However, it has been shown in comparative tests that thick aluminum-clad AS strands have less deterioration of their properties due to short-circuit faults and are much better suited for use as over- head ground wires. Finally, the transient current capacities are given for various types of widely used AS ground wires. View full abstract»

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  • Optimal Static Capacitor Allocation by Discrete Programming: Development of Theory

    Publication Year: 1970 , Page(s): 1499 - 1503
    Cited by:  Papers (7)
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    Shunt static capacitor banks are frequently an economical means of maintaining voltage levels under conditions of heavy load or transformer, line, and generation outages. This paper treats the allocation of capacitor banks as a discrete programming problem in which the objective is to minimize capital outlay for the banks required to control voltages under all anticipated contingencies. View full abstract»

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  • Self-Excited Oscillations in a Transmission System Using Series Capacitors

    Publication Year: 1970 , Page(s): 1504 - 1512
    Cited by:  Papers (20)
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    Self-excitation can result from using series capacitors in EHV transmission circuits if the series compensation is large and the circuit resistance small. Such a condition can be realized in a highly compensated transmission line using bundle conductors. An analytical approach to solve for the borderline conditions between stability and instability is presented. The analysis presented is suitable for the simultaneous consideration of both electromechanical (hunting) and primarily electrical (self-excitation) oscillations using lumped circuit constants, or for cases of distributed circuit parameters (long lines and/or solid-rotor generators). Numerical examples are included. View full abstract»

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  • Outdoor 2550-Bil Shielded Precision Gas Capacitor

    Publication Year: 1970 , Page(s): 1513 - 1521
    Cited by:  Papers (3)
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    A new, SF6 insulated 1500/¿3-kV, precision capacitor for outdoor operation is described. The capacitance of the unit is 5OpF, the dissipation factor is less than 0.001%, and BIL is 2550-kV. This design could be applicable to other high-voltage apparatus, such as instrument transformers or bushings. View full abstract»

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  • 700/765-kV AC Substation Design Criteria: Summary of Industry Practices

    Publication Year: 1970 , Page(s): 1521 - 1524
    Cited by:  Papers (2)
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    In order to determine major trends in substation design practices above 700 kV, a survey was made of three major electric utility systems in the United States and Canada. These findings are presented in tabular form for easy comparison of design features and are basically the criteria in use as of June 1, 1969. Some significant variationg in data are explained in the accompanying notes. This informnation should be valuable to companies planning systems in this voltage range and will also serve to be a permanent record of the state of the art at this point in time. View full abstract»

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  • Field Pattern and Associated Losses in Aluminum Sheet in Presence of Strip Bus Bars

    Publication Year: 1970 , Page(s): 1525 - 1539
    Cited by:  Papers (8)
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    The calculation of eddy-current losses in aluminum sheets of definite and infinite thickness in the presence of bus bars carrying heavy currents is presented. The expression for losses has been developed; a digital computer has been used to calculate the losses for several particular cases. Various curves are plotted to make the results readily available for practical use. The investigation indicates a thickness of conductor sheet in proximity to a bus bar which causes minimum loss due to eddy currents induced in it. View full abstract»

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  • A New Equivalent Circuit for Double-Cage Induction Motors

    Publication Year: 1970 , Page(s): 1540 - 1545
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    This paper suggests a new equivalent circuit for double- cage induction motors. The circuit parameters were calculated using well-established procedures, and the predicted results were verified from the test results available for commercial machines of various sizes and outputs. A modified approach has also been suggested to represent iron losses. View full abstract»

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  • Nonlinear Magnetic Field Analysis of DC Machines, Part I: Theoretical Fundamentals

    Publication Year: 1970 , Page(s): 1546 - 1554
    Cited by:  Papers (21)
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    Improvements in the method of determining the magnetic fields of nonlinear dc machines are introduced in part I of the paper. A modified, successive line overrelaxation technique to satisfy boundary conditions is developed. A novel block relaxation technique, the additive acceleration of convergence, is explained. The improved method also takes care of relative position changes between field and armature. In part II [8] the improved method is applied to a large dc machine. A new computer flux plotting procedure is developed in part III [9]. View full abstract»

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Aims & Scope

This Transactions ceased production in 1985. The current retitled publication is IEEE Transactions on Energy Conversion and IEEE Transactions on Power Delivery, and IEEE Transactions on Power Systems.

Full Aims & Scope