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Power Apparatus and Systems, IEEE Transactions on

Issue 6 • Date Nov. 1974

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Displaying Results 1 - 25 of 26
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1
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  • IEEE Power Engineering Society

    Page(s): c2
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  • Abstracts

    Page(s): 1729 - 1746
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  • Diameter and Current Density of Single and Multiple Cathode Discharges in Vacuum

    Page(s): 1747 - 1757
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    The diameter of craters formed by a vacuum discharge on a copper cathode was determined for single and multiple discharges in the current range of 4-230 A. For a fixed current the crater diameter has values according a lognormal distribution solely determined by the current. Current chopping is characterized by the, forming of craters having one specific diameter (3,6 ¿m). After splitting of a discharge the current is on the average equally divided over the partial discharges. The surface geometry influences the movement of the metal vapour discharge over the cathode, it does not affect the distribution of cratersizes. The most probable current density in the cathode plane is a function of the current and is in the order of 108 A/cm2. View full abstract»

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  • Calculation of Losses in Steel Enclosures of Three Phase Bus or Cables

    Page(s): 1758 - 1767
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    This paper derives a method of calculating losses in steel enclosures that contain three equilaterally spaced balanced three phase conductors. Results are presented in a series of graphs which can be used for design purposes. Experimental data on a 30 inch (76cm) steel sheath confirmed the theoretical calculations. View full abstract»

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  • Current Limiting Device - A Utility's Need

    Page(s): 1768 - 1775
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    Dramatic growth of today's utility systems is causing fault currents to exceed circuit breaker capabilities at existing major stations. Moreover, mathematical projections indicate that this trend will continue at an accelerated rate. Development of a device to limit the instantaneous magnitude of the fault currents to predetermined levels is actively being pursued. This paper discusses the need and application of such a current limiting device. View full abstract»

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  • Analysis of an Alternator with Two Displaced Stator Windings

    Page(s): 1776 - 1786
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    To improve efficiency and alleviate certain limitations in large generators, two separate stator windings have been suggested. The behavior of an alternator with two 3-phase stator windings displaced by an angle e;, is analyzed by means of an orthogonal transformation of the a, b, c; A, B, C; and fd variables into a new set: dl, ql, 01; d2, q2, 02; and fd. For balanced operating conditions the differential equations with the new variables have time-indenendent coefficients. Thus a phasor diagram can be drawn using self and mutual reactances Xd, Xqv X12d and X12q, determined from flux linkages. The latter are based on flux plots obtained bysolving the quasi-Poissoniandifferentialequation. The characteristic parameters for a specific operating condition are calculated for a 1200 MVA, 24 kV, 60 Hz, two-pole turbogenerator, and test data are presented covering single circuit operation on a 2-circuit generator with 600 belts connected as an alternate pole and alternate belt type double winding machine. View full abstract»

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  • Spectral Characteristics of Acoustic Noise from Metallic Protrusions and Water Droplets in High Electric Fields

    Page(s): 1787 - 1796
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    The spectral properties of acoustic noise generated by corona at imperfections and water droplets on high voltage transmission lines are studied by means of single site corona sources in a coaxial geometry. The steady state noise as generated by these metallic imperfections or spitters and by single, flow rate dependent, sites of water emission is recorded and analyzed by means of a high fidelity microphone and a recording wave analyzer. To insure isolation from ambient noise, the entire electrode structure used to generate the corona is contained in an anechoic chamber. View full abstract»

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  • A Low Voltage Arm for EHV Impulse Dividers

    Page(s): 1797 - 1804
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    Parameters of the low voltage arm for damped capacitive dividers operating in the multi-megavolt region are analyzed. The influence of the residual inductance of the capacitive and resistive elements of this arm on the overall divider performance is examined experimentally through application of a new measuring technique. The desirable low inductance of these elements is in contradiction to the required dielectric strength and thermal capacity. A new optimized design of the low voltage arm is presented which can be manufactured in a normal high voltage laboratory workshop. View full abstract»

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  • Current Expectations for Fusion Power from Toroidal Machines

    Page(s): 1805 - 1809
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    The rapidly increasing effort to solve the problems of the controlled release of nuclear fusion energy has been stimulated by recent maturation of the science of plasma physics, especially in one area -- the confinement of plasma in closed magnetic fields. At the same time, significant experimental progress has been achieved with magnetic mirror machines, and a large toroidal theta pinch is under construction at Los Alamos. Enthusiasm is running high in groups working on laser-ignited fusion. Perhaps all of these approaches will lead to viable power systems. It seems to be generally accepted, however, that toroidal magnetic machines have the greatest probabilit-y of being first if not the only approach to succeed, and this paper restricts its attention to that category. Current theories correspond to experimental results in the laboratory, and predictions of these theories imply the possibility of successful thermonuclear reactors. At the same time increasingly more realistic studies of hypothetical fusion power stations carried out by laboratory, university, utility, and manufacturing personnel make them appear to be potentially of great economic interest. Serious problems still remain, but increasing government support leads many to expect a scientific feasibility experiment and a demonstration of thermonuclear burning of deuterium-tritium fuel before 1980. View full abstract»

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  • Three Phase Transformer Transients

    Page(s): 1810 - 1819
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    This paper describes an electromaanetic circuit model of three ohase transformers capable of includina ferromacanetic non-linear effects includinga hvsteresis, suitable for anv number of windinas with a variety of interphase connections and applicable to any magnetic circuit confiauration. In particular, three of the common types of magnetic circuits are considered i. e. (1) bank of sinqle phase cores (2) three limbb core and (3) five limmb core. The model is applied to tne solution of the inrush currents in a variety of situations and the results are shown to compare favourably with experimental results. View full abstract»

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  • Anomalous Breakdown in Uniform Field Gaps in SF6

    Page(s): 1820 - 1826
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    Experiments showing anomalously low breakdown voltages in uniform field gaps in SF6 are discussed. A generalized quantitative criterion suitable for computer calculations of breakdown voltages in known fields in SF6 and other strongly electronegative gases is described, and it is shown that the anomaly in the uniform field gap breakdown voltages can be satisfactorily accounted for. Similar anomalies can occur in other field geometries and in other gases; it is shown how to avoid such breakdowns. View full abstract»

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  • Generalized Derivation of Fields, and Impedance Correction Factors of Lossy Transmission Lines Part I. Lossy conductors Above Lossless Ground

    Page(s): 1827 - 1831
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    After a brief historical review, integral equations are developed for the electromagnetic field vectors in space for a lossless system. The application of simple boundary conditions is demonstrated. This is an introduction to the generalized integral wave solution in Part II. 1 It is shown that the lossless ground plane can be replaced by image conductors. The effect of conductor losses on the electromagnetic field of the plane waves and the aspect of modal attennation are briefly discussed. View full abstract»

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  • Generalized Derivation of Fields, and Impedance Correction Factors of Lossy Transmission Lines Part II. Lossy Conductors Above Lossy Ground

    Page(s): 1832 - 1841
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    A step by step solution of fields in the air and resistive soil for a single-conductor line is presented. Expression for the total line series impedance is derived. Fourier transform technique is applied to provide solution in a generalized integral form. Numerical method is suggested and a suitable computer programming is appended. The single-conductor line solution is extended to multiconductor system above earth with arbitrary dielectric constant and permeability. Various methods developed by other authors are reviewed. View full abstract»

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  • Complex Root Compensator A New Concept for Dynamic Stability Improvement

    Page(s): 1842 - 1848
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    The theoretical background for a new method of extending the dynamic stability limit is presented in this paper. Analysis of the transfer function of a synchronous machine, connected to an infinite bus through a reactance, reveals important characteristics of the machine when it is operating at large torque angles. View full abstract»

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  • Shunt Capacitor Switching EMI Voltages, Their Reduction in Bonneville Power Administration Substations

    Page(s): 1849 - 1860
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    Back to back switching of grounded Wye shunt capacitors cause high frequency, high magnitude current flow in overhead bus and ground mat conductors. Measurements of induced voltages on control cables and receptacles, transverse voltages on fuse blown PT secondaries and personnel intercept voltages are reported. BPA methods of confining transients to capacitor areas and shielding techniques are reviewed. View full abstract»

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  • Curvilinear Finite Elements for Two-Dimensional Saturable Magnetic Fields

    Page(s): 1861 - 1870
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    A family of finite elements with curved sides is described. Both flux density an: permeability may vary in a complex manner within each element. These elements are well suited t. the Newton-Raphson iteration process, yielding asymptotically quadratic convergence. They are compatible with the well known simple triangular element. Computational trials show the new elements to be capable of improved accuracy for a given computing time, and to have much greater geometric flexibility than triangles. View full abstract»

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  • Nonlinear Salient Pole Alternator Subtrannsient Reactances and Damper Winding Currents

    Page(s): 1871 - 1892
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    In the subtransient analysis of salient pole alternators the reactances X11d and X11q are generally assumed to be constants. In saturated alternators these reactances are in reality functions of the pre-transient load and saturationix This gaper is an extension of former papers by Fuchs, et it dealing with steady state, and transient reactances. The methods used are the same as in [1] and [2] with the addition of damper windings effects. Notations not explained here are those of Concordia4 and of Fuchs3. The analysis is applied to a G. E. alternator with the following name-plate data: 82.5 MVA, 16.5 kV, wye-connected, 40 poles and 60 Hz, described in [1]. View full abstract»

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  • Load Cycle Test on 154kV Cross-Linked Pe Insulated Cable

    Page(s): 1893 - 1901
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    This paper contains the results of load cycle tests conducted on 154 kV cross-linked polyethylene (XLPE) insulated cable. The purpose of such tests was to obtain the necessary technical data te determine the practicality of utilizing XLPE insulated cable as power transmission lines. To accomplish this task, two types of cables with different insulation thicknesses were manufactured and tested, together with the accessories of out door type terminals and molded joints. View full abstract»

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  • Toroidal Winding Geometry for High Voltage Superconducting Alternators

    Page(s): 1902 - 1908
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    A modification of the Gramme-Ring armature winding is proposed-for possible use in high voltage alternators. The geometry of a toroidal winding permits good management of both eectric and magnetic fields within a machine. Design formulae for a superconducting alternator with atoroidally wound armature are presented, and a comparison is made between an armature designed on this principle and an existing armature for the MIT-EEI superconducting alternator. View full abstract»

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  • The Detection of Partial Discharges in High Voltage Potential Transformers in Service

    Page(s): 1909 - 1916
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    This paper describes a test technique which has been developed for use in the field to detect internal partial discharges which may occur in high voltage potential transformers. The first stage consists of. detecting ultrasonic signals caused by the discharges. This is done while the equipment is still energized by the system. The second stage consists of removinj from service the transformers found to be producing high ultrasonic signal levels and then subjecting those transformers to tests to measure the partial discharge level. View full abstract»

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  • Sensor Coil for Internal Fault Protection of Shunt Reactors

    Page(s): 1917 - 1926
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    In shunt reactors of modern day construction the required inductance is realized with coil turns numbering in thousands. When a turn to turn fault develops the conventional relaying schemes and protections are not adequate to sense a fault in its incipient stage until it has progressed through a-major section of the winding. In this paper the authors have described a fault sensing technique for detecting a turn to turn fault instantaneously within a reactor winding. An analytical description of the sensor coil is presented and the performance of the protective system as proven on an EHV shunt reactor is described. View full abstract»

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  • Order Form for IEEE Publications

    Page(s): 1927
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  • Membership Application IEEE Power Engineering Society

    Page(s): 1928
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  • Contributors

    Page(s): 1929 - 1932
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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