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Power Apparatus and Systems, IEEE Transactions on

Issue 1 • Date Jan. 1974

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Displaying Results 1 - 25 of 63
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1 - 456-b
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
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    Freely Available from IEEE
  • Membership Application IEEE Power Engineering Society

    Page(s): 1
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    Freely Available from IEEE
  • IEEE Publications at Low-Cost Member Rates [advertisement]

    Page(s): 2
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    Freely Available from IEEE
  • 1973 Power Industry Computer Application Conference

    Page(s): 3 - 30
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    Freely Available from IEEE
  • Subsurface Transformer Finish Systems

    Page(s): 31 - 39
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    A finish system providing corrosion protection for subsurface transformers is exposed to severe and variable environmental conditions. For example, it can be subjected to temperatures as high as 125 °C, wet and dry soils, and soils'containing fertilizer, salt, and other chemicals which affect the resistivity and pH of the soil. The coating can also be subjected to severe cathodic and anodic disbonding conditions that result from electrochemical reactions caused by the presence of copper groundings and zinc or magnesium anodes. The advantages and disadvantages of several finish systems used for subsurface transformers are reviewed in their relationship to these severe environments. View full abstract»

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  • Saturation Harmonics and Current Waveforms of Single-Phase Induction Motors

    Page(s): 40 - 44
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    The harmonics in the air gap magnetic field of saturated single-phase induction motors with uniform or nonuniform stator teeth and cores are analyzed using two-dimensional Fourier series. The analysis shows that when the fundamental backward-traveling and forward-traveling magnetic field waves are saturated they produce saturation harmonics having several different velocities, frequencies, and spatial harmonics. The saturation harmonics for an applied 60 Hz voltage can include 180 Hz and 300 Hz waves with spatial harmonics equal to the number of pole pairs, which create 180 Hz and 300 Hz components in the current drawn by the motor. Current waveforms are shown which demonstrate the saturation effects. View full abstract»

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  • Magnetic Field Distribution in Solid Metallic Structures in the Vicinity of Current Carrying Conductors, and Associated Eddy-Current Losses

    Page(s): 45 - 56
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    The analysis of the magnetic field distribution in conducting slabs in the presence of current carrying conductors and the calculation of eddy-current losses is presented. Integral expressions of field quantities have been developed for filamentary current sources and loss formulae established. A new approach to minimization and division of losses between composite shields is described. The equations are solved on a digital computer for different cases. Curves are plotted for several applications for practical use. An optimum thickness of shield for minimum power loss is also established. View full abstract»

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  • On the Statistics of Multi-Break Circuit Breakers-Thermal and Dielectric Regimes

    Page(s): 57 - 61
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    This paper studies the statistical performances of multi-break circuit-breakers. For the thermal reignition regime, a formal proof is given of the fact that under certain conditions (explicitly derived) the overall performance of a multi-break breaker is better than that expected from a proportional extrapolation of the results from a single break. For the dielectric regime, it is shown that the hitherto published formulas are conservative in the sense that they overestimate failure probabilities. Using these formulas, graphs are given which compare the failure probabilities of a four-break breaker in the dielectric regime with that of a single break under certain given fractions of the stress on the complete pole. Some general results of a statistical nature relating complete circuit breaker failure probabilities in the dielectric regime to a single break failure probability are also given. View full abstract»

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  • Finite-Element Solution of the Eddy-Current Problem in Magnetic Structures

    Page(s): 62 - 72
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    Analysis of the eddy-currentproblem in magnetic structures by the method of Finite-elements is presented. The linear diffusion equation representing the appropriate energy functional is described. The field region is discretised by triangular Finite-elements and the solution to the field problem is obtained by minimizing the energy functional with respect to each of the vertex values of the vector potential. Expressions for the magnetic field, electric field and eddy-current losses are presented. The method is applied to a few cases of engineering interest and compared with results of classical analysis and tests. View full abstract»

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  • Stepped-Field Induction Machines

    Page(s): 73 - 80
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    Stepped-field, thyristor-controlled induction machines combine the reliability of thyristors with the robustness of squirrel¿cage induction machines. View full abstract»

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  • The Use of Single-Phase Overhead Test Lines and Test Cages to Evaluate the Corona Effects of EHV and UHV Transmission Lines

    Page(s): 81 - 90
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    Economic considerations often limit the use of full-scale 3-phase test lines for the investigation of transmission-line corona effects. Testing of a large number of different conductor configurations can be more conveniently and efficiently carried out on comparatively short sections of conductors on single-phase test lines and in test cages. Techniques for measuring the single-phase corona performance of conductors are presented, along with a discussion of means by which the observed data can be used to determine the corona performance of 3-phase transmission lines. View full abstract»

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  • Distribution Transformer Load Characteristic Functions for Residential Central Air Conditioning

    Page(s): 91 - 99
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    For the first time, load quantities consisting of maximum demands, 1 diversified demands, coincidence factors, daily load factors, monthly load factors, annual load factors, loss versus load factor relationships, and responsibility factors are developed for distribution transformers serving residential central air conditioning customers. Weather information and over three million values of load versus time data were recorded on magnetic tape to be used as basic input information for the analysis. A non-linear multiple regression analysis program was created to generate the correlation equations and determine the index of multiple correlation, index of multiple determination and standard error of estimate for each load quantity. Weather sensitive variables, energy usage, number of customers, number of central air conditioning units, and customer living patterns are incorporated in the regression equations. View full abstract»

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  • Single-Pole Switching-A Comparison of Computer Studies with Field Test Results

    Page(s): 100 - 108
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    The electrical characteristics of a 150 km 500 kV transmission line during single-pole switching is simulated on a hybrid computer. A time dependent arc simulation aids in the study of the voltage occurring across the arc and the recovery voltage during single-pole switching. The accuracy of the simulation is verified by comparison with field tests. The simulation is also used to investigate the transient recovery voltage following a bolted, sudden release fault. This investigation reveals that the transient recovery voltage is markedly larger than the steady-state value and that, for a normal three cycle clearing, it is a function of the time that the fault occurs. The simulation of the transmission system established in this paper may be used to advantage in determining the dead time necessary to insure extinction of the secondary arc current. Moreover, the results set forth should serve as guides for engineers designing systems for single-pole switching. View full abstract»

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  • Ground Electrode Resistance Measurements in Non Uniform Soils

    Page(s): 109 - 115
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    Ground electrode resistance measurements are usually done by Fall of Potential method. The potential probe position (0.618 rule) has been calculated for homogeneous soil 1,2]. Theoretical computation and experimental verification of the potential probe position in non homogeneous soil is presented. The experimental work was carried out on a twin layer laboratory model [3,4,6]. View full abstract»

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  • Transient Behaviour of Damped Capacitive Voltage Dividers of Some Million Volts

    Page(s): 116 - 121
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    This paper describes the basic design of two types of damped capacitive voltage dividers. The impedance characteristic of the voltage divider and of the complete measuring circuit is discussed. The actual response characteristics of damped capacitive voltage dividers are surveyed and the possible application evaluated. View full abstract»

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  • Open Circuit Tooth Ripple Eddy Current loss in Smooth Laminated Poles

    Page(s): 122 - 129
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    This paper reports onaresearchofphenomenaassociated with core loss due to tooth ripple flux in smooth laminated poles for the open circuit condition in ac machines. A model for investigation of the phenomena is described, incorporating a calorimetric technique for determination of loss location. There is also described a method for evaluating losses by utililizing a mathematical model which encompasses materials characteristics of the lamination material. Loss prediction and experimental results are in excellent agreement. View full abstract»

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  • Ionization Tests on a Fourteen Year Old Hydrogeneretor Winding

    Page(s): 130 - 136
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    Recently a decision was made to rewind a 1OOMW, 13.8 kV hydrogenerator which had been in service for about fourteen years. The statqr insulation on this generator was an early version of "Thermalastic", a synthetic resin vacuum impregnated mica insulation. Prior to removing the coils from the machine a series of ionization probe and tangent delta measurements were made. Selected coils, including all coils from one parallel string of the winding Were then subjected to detailed laboratory investigations. In this paper, the relation between ionization probe readings and tangent delta tip-up values is demonstrated. The effect of time of voltage application on ionization probe readings, tangent delta, and capacitance is investigated, and the importance of standardizing the time of voltage application prior to these measurements ments is emphasized. In view of the length of service encountered, the condition of the; insulation was thought to be very satisfactory. View full abstract»

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  • Theory of the Bridge-Rectified Synchronous Generator with a large Number of Stator Phases - Part I

    Page(s): 137 - 145
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    In order to improve the characteristics of a bridge-rectified synchronous generator, the number of stator phases is increased. This paper discusses the basic theory of this machine, which turns out to be ati interesting cross link between the DC commutator and the AC synchronous machine. A mesh connected stator winding is found to be preferable to a star connection and the stator thus becomes the equivalent of a conventional DC armature with each previous commutator bar replaced by two diodes. Commutation is now initiated by the mainpole and the commutation zone changes in width and location as a function of load. Consequently, commutation has a major influence on the required excitation and the general characteristics of the machine. The theory presented is based on the general MMF distribution in the airgap and deals with actual non-sinusoidal quantities. The theory is also adaptable to brushless DC shunt and series motors with an optional compensating winding. Part II discusses a numerical example in detail. View full abstract»

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  • Theory of the Bridge-Rectified Synchronous Generator with a Large Number of Stator Phases - Part II

    Page(s): 146 - 148
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    The usefulness of the previously derived equations for commutation phenomenons and other related characteristics is demonstrated by means of a numerical example of the Salient Pole and Constant Airgap type machine. These two limiting cases bracket the characteristics of an actual Salient Pole type machine including the pole edge fringing flux. The results are discussed and commented upon in detail. View full abstract»

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  • Applications of Waste Processing Systems for Pressurized Water Reactors

    Page(s): 149 - 157
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    This paper provides an introduction in the application of Waste Processing Systems in the Westinghouse Pressurized Water Reactor plants. These systems employ the techniques of waste product concentration, long term storage, recycling and radiation monitoring in order to implement the basic philosophy governing radioactive releases established by national and international guidelines. In the United States, the limits of radioactive release are established by the Code of Federal Regulations of the Atomic Energy Commission. View full abstract»

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  • A consideration on measurement of voltage callapse during chopping in chopped impulse test of transformer

    Page(s): 158 - 166
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    In the chopped impulse test of a transformer, a steep voltage collapse appears across the terminals of the transformer to be tested. This paper clarifies the wave shape of the voltage collapse during chopping and the requirements of a device for measuring the voltage collapse. View full abstract»

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  • Modelling of controlled rectifiers in feedback systems

    Page(s): 167 - 175
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    Controlled rectifiers are often incorporated in closed-loop systems. To determine the small signal performance of such systems the rectifier must be appropriately modelled. The paper reviews the existing models and compares their step response performance, Nyquist plots and stability boundaries. It is shown that a recently developed discrete model that takes into account the commutation angle is in good agreement with experimental results. The rectifier transfer function is obtained and the large signal non-linear behaviour discussed. A rigorous mathematical dynamic model developed is capable of describing both the small and the large signal response of the system. View full abstract»

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  • The IREQ Ultra High Voltage Laboratory and Test Facilities

    Page(s): 176 - 186
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    The High Voltage Laboratory of Hydro-Quebec Institute of Research (IREQ) has been designed to cater for research and test requirements on equipment for future systems of up to 1,500 kV rms nominal transmission voltage. Some of the factors which were considered during the planning of the laboratory are described. A number of problems which required unusual solutions are mentioned, and in addition, descriptions of the major items of test equipment are given. View full abstract»

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  • Identification of Electrical Parameters in Large Earth Grids

    Page(s): 187 - 195
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    The conductors in the earth-grid of a large electric power station must withstand for the maximum fault duration, current due to the worst case unbalanced fault. The fault duration and the worst case fault current may be calculated by well known means. However, the division of fault current when it is injected into the earth grid is difficult to determine with confidence. The authors describe a scale modelling experimental technique, which can yield improved data on the division of fault return current within an earth grid. Some results are quoted taken on a 1 : 400 scale model of the earth grid of the Liddell power station of the Electricity Commission of New South Wales, Australia. 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