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Power Apparatus and Systems, IEEE Transactions on

Issue 11 • Date Nov. 1969

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Displaying Results 1 - 22 of 22
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1
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    Freely Available from IEEE
  • IEEE Power Group

    Page(s): c2
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    Freely Available from IEEE
  • Unbalanced Operations of Three-Phase Machines with Damper Circuits

    Page(s): 1585 - 1593
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    A study on unbalanced short circuits of three-phase machines with additional field circuits is discussed, and a detailed solution for the case of a double-line-to-ground short circuit of a salient-pole synchrenous machine is offered. By mathematical analysis, new and complete transient solutions for short-circuit currents, torque, and open-phase voltage are derived for ready uses. View full abstract»

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  • Recommended Phasor Diagram for Synchronous Machines

    Page(s): 1593 - 1610
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    A phasor diagram for excited-field synchronous machines is recommended for adoption by USASI and IEC. The diagram and the choice of direct and quadrature axes are defined so that the laws of induced voltages are expressed in "natural" form. The recommended diagram overcomes certain apparent inconsistencies in the phasor diagram in USASI Standard C42.10-1957. View full abstract»

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  • Calculation and Testing of Damper-Winding Current Distribution in a Synchronous Machine with Salient Poles

    Page(s): 1611 - 1619
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    Damper-bar currents of a synchronous machine induced during transient asynchronous operation are studied in this paper. Experimental and mathematical methods are used in analyzing an actual synchronous machine. Results of calculations and measurements are presented and compared. All analyses are carried out both for the synchronous machine with a squirrel cage and with a grill (open end rings). View full abstract»

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  • The Quadrature-Axis Equivalent Circuit of the Synchronous Machine with a Grill

    Page(s): 1620 - 1624
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    The complete equivalent circuits of a synchronous machine with a grill (open end rings) are analyzed. Because the direct-axis equivalent circuits for both the squirrel-cage and the grill machines are the same and are well known, the paper develops only the quadrature-axis equivalent circuit for a machine with a grill. View full abstract»

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  • A Digital Model for Three-Phase Induction Machines

    Page(s): 1624 - 1634
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    A digital model for a three-phase induction machine is developed, which is particularly adapted for studying its dynamic performance when fed from an inverter. Conventionally, the induction motor is analyzed in terms of its d-q variables, while the operation of the inverter generally needs continuous monitoring of the state of its phase quantities. Thus in a study of the composite inverter-induction-machine system, one is faced with the problem of matching the two sets of variables. The proposed model overcomes this problem by describing the machine behavior directly in terms of the stator phase variables, at the same time retaining a computational simplicity comparable to that of the d-q equations. Furthermore, it is shown that the machine equations, expressed in terms of the stator terminal variables, can conveniently handle the various terminal conditions, like open phases, that may arise when the machine is fed from an inverter. Detailed equations in a form suitable for digital solution are also presented for possible terminal constraints of this nature, with or without the machine neutral connected to supply. View full abstract»

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  • Method of Multiple Reference Frames Applied to the Analysis of a Rectifier - Inverter Induction Motor Drive

    Page(s): 1635 - 1641
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    The method of multiple reference frames and the equations of transformation of the inverter are employed to establish a method of calculating the inverter current in a rectifier - inverter drive system. Since the method of multiple reference frames does not use phasors or complex impedances, the calculation of the inverter current is simple and direct. Also presented is a method of approximating the 6th harmonic variation in the capacitor voltage of the filter, connected between the rectifier and the inverter. This method permits a simplified means of rapidly obtaining a first- order approximation of the variation in the capacitor voltage. The analysis establishes a straightforward method of calculating variables in a rectifier - inverter drive system, which are difficult to determine by conventional methods of analysis. View full abstract»

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  • Double-Armature Polyphase Synchronous Generator with Capacitive Excitation

    Page(s): 1642 - 1646
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    An experimental study of a capacitively excited synchronous machine having armature windings on both rotor and stator is discussed. Voltage regulation, efficiency, and power output data show the machine to be a compact, high-energy density, low-impedance source of electric energy. Effects of unbalanced resistive load and magnetic saturation are illustrated. Voltage regulation of 10 percent and electromagnetic efficiency of 84 percent have been realized, with the machine operating in the manner of a self-excited dc shunt generator without a voltage regulator. View full abstract»

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  • Magnetic Fields, Eddy Currents, and Losses, Taking the Variable Permeability into Account

    Page(s): 1646 - 1657
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    An analog method is described in which a network, consisting of semiconductor diodes, capacitors, and resistors, is used to solve the partial differential equations. The magnetization curves of electrical sheet steels and solid iron are simulated to a high degree of accuracy by specially selected silicon zener diodes. With constant permeability any two-dimensional region, consisting of solid or laminated iron, copper, brass, air, etc., may be considered. With variable permeability, the one-dimensional case has been treated for three different boundary conditions. The equations necessary for the determination of the quantities flux, power, force, etc. are derived and transient phenomena are also considered. As a numerical example, the distribution of current and flux density in time and space in the interior of a solid iron plate is determined for different boundary conditions, and the eddy current losses are calculated. Due to the variable permeability, a discretization error appears in the form of a peculiar high-frequency ripple with sharp peaks. This represents a considerable obstacle if relaxation methods are attempted. View full abstract»

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  • A Probability Simulation Method for Determining the Reliability of Switching Stations

    Page(s): 1657 - 1664
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    A useful treatment of as broad a class of such reliability problems of switching stations and substations as can be treated by the theory of Markov processes is covered. The mechanics of failure and repair effects are discussed by means of mathematical models, and basic members with memory, fluctuating failure, and repair rates are evaluated. The system is assumed to operate under normal and stormy-weather conditions. The nonrandomness of special events are involved. In addition, a Monte Carlo method of computer simulation is presented for determining the reliability of stations. View full abstract»

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  • Generalization of the Normalization (Per-Unit) Technique

    Page(s): 1665 - 1672
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    This paper presents a generalization of the normalization (per-unit) technique. The introduction of a region graph with its associated tree and cotree, a form of network equations designated as a primary system and some properties of matrix triple products, makes it possible to develop this normalization theory in a broad and mathematically rigorous form. Particular attention is paid to nominal normalization and the restrictions it imposes on the inter- relations of the normalization constants. A particularly significant result of this normalization theory is that it produces a normalized network identical with its prototype except for altered values of network parameters. The development organizes the normalization portion of the mathematical model for vast power networks into an effective structure, one which is particularly suitable for further theoretical development, digital computer calculations, and tutorial purposes. View full abstract»

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  • Effect of Conductor Imbalance on Flexible Transmission Structures

    Page(s): 1672 - 1678
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    Methods of determining longitudinal tensions to be supported by flexible transmission structures, such as tubular steel poles, A frames, H frames, and similar two-dimensional structures, as a result of phase severance, or similar imbalance in one span of a series, are outlined. Tension reduction caused by insulator displacement plus the consequent structure deflection is determined. View full abstract»

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  • Dynamic Strain Distribution on Loaded Stranded Cables

    Page(s): 1678 - 1690
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    The correlation which exists between the dynamic strains occurring in span and those occurring at the rigidly clamped extremities on vibrating taut circular beams is shown. The way wire slippage, occurring on real loaded stranded cables, will reduce the dynamic strains and contribute to the cable's internal damping is also illustrated. View full abstract»

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  • Creep Studies of Aluminum Conductor Alloys

    Page(s): 1690 - 1695
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    The results of a comprehensive laboratory test program on the creep characteristics of EC-H19, 5005-H19, and 6201- T81 aluminum alloy conductor wires are presented. Creep curves for those alloys are illustrated over a stress range of 15 to 25 percent minimum average strengths and a temperature range of 25 to 100°C. The importance of creep history as a function of total creep at any time and temperature is presented. A correlation is made between wire creep and the creep of conductors made from the wire. A projection is made that creep data presented in this paper will be used to predict total creep of conductors over their service life when reasonable estimates of operating conditions are made. View full abstract»

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  • Effects of Axial Slits on the Performance of Induction Machines with Solid Iron Rotors

    Page(s): 1695 - 1709
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    The paper deals with the improvement in the performance of an induction machine with a solid iron rotor slitted axially. The improvement is observed mainly in the full-load slip, the power factor, and the starting torque. In this paper, a one- dimensional model of a slitted rotor is presented based on the original and novel concept that the tooth and slit profile is a flux line. Based on this, the field distribution inside the iron is obtained from 1) a linear theory and 2) a limiting nonlinear theory. The results of the analyses based on these theories are found in better agreement than those based on the composite permeability theory. View full abstract»

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  • Stability Analysis of a Symmetrical Induction Machine

    Page(s): 1710 - 1717
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    A stability study of an induction machine is performed by applying the root-locus criterion to the equations which describe the behavior of the machine during small displacements about a steady-state operating point. This investigation reveals that a symmetrical induction machine may become unstable at low speeds (low frequencies) even though balanced, constant amplitude, sinusoidal voltages are applied to the stator terminals. Regions of machine instability are established from the results of a digital computer study. The results of an analog computer study are included to illustrate the modes of operation which occur within these regions. Regions of instability for changes of system parameters are presented and discussed. Also, it is shown that the root- locus criterion can be utilized to identify regions of lightly damped operation. View full abstract»

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  • Design Aspects of Three-Phase Inductor Alternators

    Page(s): 1718 - 1724
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    A design procedure for the three-phase heteropolar type of inductor alternator has been worked out. Expressions for open-circuit-voltage direct- and quadrature-axis reactances of arnature reaction, short-circuit characteristic, and the power output of this type of alternator have also been developed. The stator leakage reactance, which is an important parameter in the design and operation of such alternators has been reviewed. The design procedure has been applied to a typical alternator of this type and test results confirm the procedure. View full abstract»

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  • Inductance Coefficients of Three-Phase Inductor Alternators: Part I - Analytical Study

    Page(s): 1725 - 1730
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    The paper develops expressions for various inductance coefficients of three-phase inductor alternators on the basis of a harmonic permeance distribution in the air gap. These expressions involve harmonics in the MMF distribution of the armature windings and also harmonics in the permeance distribution due to the non- uniform air gap. The analysis shows that, when the armature carries current, both odd and even harmonic voltages are induced in it. However, a certain group of harmonics can be eliminated by suitably choosing the number of rotor teeth and stator teeth and number of coils per phase. It is also shown in the analysis that inductor alternators having an odd number of rotor teeth are superior to those with an even number of rotor teeth. Performance equations of both types of alternators are also established. View full abstract»

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  • Inductance Coefficients of Three-Phase Inductor Alternators: Part II - Numerical and Experimental Results

    Page(s): 1731 - 1736
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    In this paper, the various inductance coefficients of three-phase inductor alternators have been theoretically calculated and compared with the results obtained from a test performed on the alternator. The results obtained from the test show a general agreement with the theory derived in [1]. The inductor alternators with an odd number of rotor teeth are found to be similar to ordinary synchronous alternators in respect to their inductance coefficients, but the inductor alternators with an even number of rotor teeth are quite dissimilar as shown in the simplified expressions developed here. The equations developed are also useful in analyzing these alternators under transient conditions. View full abstract»

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  • Startup of San Onofre

    Page(s): 1736 - 1738
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    The startup activities of the San Onofre Nuclear Generating Station, Unit, 1 are covered. The tests during startup reveal component design deficiencies, system design deficiencies, and discrepancies in plant operating instructions. Resolution of these deficiencies are important to the proper operation of this plant and the design of future plants. View full abstract»

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  • Contributors

    Page(s): 1739 - 1740
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    Freely Available from IEEE

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