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IEEE Transactions on Power Apparatus and Systems

Issue 2 • Date March 1971

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Displaying Results 1 - 25 of 64
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1971, Page(s): c1
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1971, Page(s): c2
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    Freely Available from IEEE
  • Meeting Tomorrow's Railroad Power Requirements

    Publication Year: 1971, Page(s):393 - 400
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3083 KB)

    This paper examines railroad electrification from the viewpoints of competitive position, load characteristic, service requirements and facility design. Summaries of foreign developments, railroad benefits, and railroad problems associated with electrified operation are presented. Potential electrified railway load magnitudes and characteristics are considered from individual system and national s... View full abstract»

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  • Corporate Models - A New Tool for Planning

    Publication Year: 1971, Page(s):401 - 408
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1461 KB)

    This paper discusses the role of corporate models in the planning of the growth and operation of electric utilities. This new tool is a major addition to the methods available to the engineer, financial analyst and business manager to use in the investigation of alternate courses of action for strategic planning, tactical planning and situations involving operational planning and control problems.... View full abstract»

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  • Analytical Models for Saturated Synchronous Machines

    Publication Year: 1971, Page(s):409 - 417
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2581 KB)

    Most equivalent circuit models for synchronous machines have either neglected saturation or used only one saturable reactance which was made a function of one or more machine variables. The approach of this paper is, first, to determine the regions of magnetic saturation and to identify the magnetic flux variable on which each depends. Analytical models are then developed in which each saturable r... View full abstract»

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  • Contribution to the Theory of Asynchronous Performance of Synchronous Machines with Salient Poles: Part II Analysis of MMF and Magnetic Field Angular Velocity. Power and Torque Equations

    Publication Year: 1971, Page(s):418 - 426
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2177 KB)

    The present work is a continuation of a study presented by one of the authors at the 1969 IEEE Winter Power Meeting in New York, N. Y. In that part of the paper the MMF and air gap magnetic field space variations, and the phase current time variations of a salient pole synchronous machine in asynchronous operation were analyzed. Here, the MMF and magnetic field angular velocity, as well as the pow... View full abstract»

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  • Series Capacitor Switching to Quench Electromechanical Transients in Power Systems

    Publication Year: 1971, Page(s):427 - 433
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2288 KB)

    A method of quenching transient oscillations of a generator feeding a load over long lines was implemented in the laboratory. A disturbance that caused instability was repeated with this control, and the system remained stable. View full abstract»

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  • Rotor Velocity Measurement from Power Balance Analog

    Publication Year: 1971, Page(s):434 - 440
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1503 KB)

    A new technique to obtain reliable and noise free signals proportional to the acceleration and to the deviation of the rotor angular velocity of a generator from the system synchronous angular velocity was implemented and tested. The signals thus obtained had considerably higher signal-to-noise ratio compared to the signals derived from a conventional tachometer (about 30 to 50 dB improvement) wit... View full abstract»

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  • Digital Analysis of Excitation Control for Interconnected Power Systems

    Publication Year: 1971, Page(s):441 - 447
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2007 KB)

    Excitation control by stabilizing signal taken from several locations in the system, together with the proper transfer function, has been investigated to satisfy the system stability from an overall performance view point, rather than one machine against an infinite bus. Several stabilizing signals have been tried from which the following signals have been found to have a great affect in increasin... View full abstract»

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  • Suboptimal Control to Target of Synchronous Generators

    Publication Year: 1971, Page(s):448 - 453
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1734 KB)

    In a power system, generators can oscillate following faults or line switching in the system. To reduce the size of these oscillations is highly desirable. View full abstract»

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  • Analysis of Turboalternator Magnetic Fields by Finite Elements

    Publication Year: 1971, Page(s):454 - 464
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3285 KB)

    The nonlinear quasi-Poisson equation that describes static magnetic fields in saturable iron is solved approximately by minimizing the corresponding nonlinear energy functional. The minimization is performed by means of the method of finite elements, using firstorder elements and a quadratically convergent iterative solution method. The method is applied to a turboalternator and used to predict al... View full abstract»

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  • End-Winding Leakage of High-Speed Alternators by Three-Dimensional Field Determination

    Publication Year: 1971, Page(s):465 - 477
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4487 KB)

    The rapid increase in electric and magnetic loadings of electrical machines demands improved methods of predicting the end zone field distribution. This paper presents a numerical method for the determination of end zone fields and for the calculation of end-leakage reactance of high-speed alternators. The method takes account of all boundaries, simplified in regard to their geometries and magneti... View full abstract»

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  • Interturn Short-Circuit Detector for Turbine-Generator Rotor Windings

    Publication Year: 1971, Page(s):478 - 483
    Cited by:  Papers (49)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4492 KB)

    An effective new method of detecting interturn short circuits on round rotor windings is described. The approach used is to measure the rate of change of the air-gap flux density wave when the rotor is at operating speed and excitation is applied to the field winding. The measurements are obtained by the use of a small stationary search coil positioned near the rotor surface. The voltage outputs a... View full abstract»

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  • Transient Analysis of Shaded Pole Motor

    Publication Year: 1971, Page(s):484 - 494
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3374 KB)

    Equations of performance of the shaded pole motor are written in terms of the two actual stator circuits and two equivalent rotor circuits for the squirrel cage. Transient performance under locked rotor and dynamic starting conditions is obtained by numerically solving the differential equations of performance. The equations are also used to obtain the steady state performance of the motor. Compar... View full abstract»

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  • Slip-Ring P. A. M. Induction Motors for Two Synchronous Speeds

    Publication Year: 1971, Page(s):495 - 499
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2097 KB)

    A great deal has already been published about change-speed squirrel-cage induction motors using the principle of pole-amplitude modulation (P.A.M.), but it was doubtful, in the earlier stages, whether the same techniques could be applied to slip-ring machines; and whether, even if they could, there would be many useful applications. In fact, it has now been found that the latest P.A.M. designs are... View full abstract»

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  • Speed Change of Induction Motors with Variable Frequency Supply

    Publication Year: 1971, Page(s):500 - 508
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2073 KB)

    Speed changing of induction motors fed from a variable frequency source is studied with a view to minimization of speed transition time. Step as well as linear changes in supply frequency are considered. Expressions for optimum rates of (linear) change of frequency have been obtained analytically and confirmed by model studies. The results apply primarily for large changes in speed. View full abstract»

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  • A Variable Speed Induction Motor Using Thyristors in the Secondary Circuit

    Publication Year: 1971, Page(s):509 - 514
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2029 KB)

    This paper describes a closed-loop control system for an ordinary wound-rotor induction motor, which makes use of thyristors on the secondary side as phase-controlled ac switches operating at slip-frequency. It is shown that such phase-controlled thyristors allow the torque of the machine to be varied from zero to values bounded by the normal torque/speed characteristic of the basic motor, and whe... View full abstract»

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  • The Analysis of Induction Motors with Voltage Control by Symmetrically Triggered Thyristors

    Publication Year: 1971, Page(s):515 - 525
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5542 KB)

    The application of thyristor switching to induction motor speed control has resulted in a number of unconventional supply systems. One such technique, which has been successfully employed in a number of applications, is variable voltage control by means of symmetrically triggered thyristors in the stator phases of a wye-connected machine. In this paper, an analytic method for predicting the steady... View full abstract»

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  • The Cycloconverter Driven Doubly-Fed Induction Motor

    Publication Year: 1971, Page(s):526 - 531
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1776 KB)

    A variable speed electric drive system has been developed in which the speed-torque characteristics of a dc series motor have been attained without the need for a commutator. Improved utilization of active material has been achieved by using series-connected polyphase ac windings on both the rotor and the stator of the rotating machine and by maintaining a favorable torque angle relationship betwe... View full abstract»

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  • A Method for Simulating Electric Machines

    Publication Year: 1971, Page(s):532 - 540
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2187 KB)

    In this paper a method is given to simulate electric machines on analog or digital computers. The windings in both axes of a generalized electric machine, considered as n coupled windings, are first transformed into Pi-equivalents, whose components are closely related to the actual magnetic circuits. The motional electromotive forces being then included, it is possible to draw a signal flow-graph ... View full abstract»

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  • Analysis Of Torque-Speed Curves Of Wound Secondary Couplings In The Nonlinear Region Of The Magnetization Curve

    Publication Year: 1971, Page(s):541 - 547
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1812 KB)

    This paper presents an analytical treatment to compute the torque-speed curve of a dc excited electromagnetic coupling considering magnetic saturation. The complete nonlinear magnetization curve is mathematically represented and the maximum torque is accurately predicted. The above approach being a generalized one can be applied to any electromagnetic apparatus working under saturation condition. ... View full abstract»

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  • Analysis Of Saturation And End-Effects In Variable Speed Solid Secondary Couplings

    Publication Year: 1971, Page(s):548 - 555
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1994 KB)

    In this paper Maxwell's field theory has been successfully applied to analyze the behaviour of dc excited electromagnetic couplings having solid iron in the secondary. New approaches have been developed to consider the saturation effect by the linear permeability ¿e, and the finite length effect by the end-effect factor Ke. A smooth variable speed drive that is quite competitive in many ways with... View full abstract»

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  • Losses In Squirrel-Cage Motors Due To Rotor Skew

    Publication Year: 1971, Page(s):556 - 563
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2144 KB)

    A discussion of the losses caused by skewing of a rotor with uninsulated bars is presented, giving full consideration to the distributed nature of the rotor parameters. At first, tooth pulsation and surface losses are reviewed briefly. Then an approximate method of calculation of losses due to iron cross currents in the rotor is presented and shown to yield experimentally acceptable results. The e... View full abstract»

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  • Waveshapes Of Flux Density In Polyphase Induction Motors Under Saturated Conditions

    Publication Year: 1971, Page(s):564 - 569
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1967 KB)

    An improved method is described for determining, by digital computation, the waveshape of air gap flux density in polyphase induction motors operating under saturated conditions. View full abstract»

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  • Optimization Of Pplyphase Induction Motor Design: A Nonlinear Programming Approach

    Publication Year: 1971, Page(s):570 - 578
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2194 KB)

    The problem of optimization of induction motor design is tackled as a nonlinear programming problem. The objective function or the cost function is formed taking only the material cost into account. The specifications like pull out torque, starting torque etc. are put as constraint functions. These functions are expressed in terms of important dimensions of the machine which are assumed to be cont... 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