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Power Apparatus and Systems, IEEE Transactions on

Issue 2 • Date Feb. 1966

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  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1966 , Page(s): c1
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  • IEEE Power Group

    Publication Year: 1966 , Page(s): c2
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  • IEEE News

    Publication Year: 1966 , Page(s): 1a - 9a
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  • Calendar

    Publication Year: 1966 , Page(s): 10a
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  • Analytical Study of the Step Starting and Step Running of a 3-Phase Induction Motor I - Starting Torque with Step Voltage and Step Current

    Publication Year: 1966 , Page(s): 93 - 99
    Cited by:  Papers (1)
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    A new method called the step starting of induction motors has been analytically developed. Pairs of stator terminals are connected in sequence to a voltage or current pulse from a variable frequency source. The frequency of the voltage or current pulse is zero at standstill, and it is gradually increased to bring the rotor up to required speed. In this paper, it is shown that the starting torque with a rated current pulse is much greater than the starting torque with a voltage pulse, the magnitude of the voltage pulse being that required for steady-state rated peak current in the stator. Part II of the paper discusses the electromechanics of the method with current pulses fed to the stator. It is found that the torque developed is proportional to the square of the magnitude of the current pulse. Variations in torque at any running speed are obtained by varying the magnitude of the current pulse. Any desired speed-torque characteristic of the motor is obtained by properly controlling the current with a current-control mechanism. Low resistance increases the torque developed in starting as well as in running. This analysis holds good for an unsaturated machine. View full abstract»

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  • Analytical Study of the Step Starting and Step Running of a 3-Phase Induction Motor II - Step Running of the Induction Motor

    Publication Year: 1966 , Page(s): 99 - 105
    Cited by:  Papers (1)
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    A new method called the step starting and step running of induction motors has been analytically developed. Pairs of stator terminals are connected in sequence to a voltage or current pulse from a variable frequency source. The frequency of the voltage or current pulse is zero at standstill and is gradually increased to bring the rotor up to required speed against a given load. In part I of the paper it was shown that the starting torque with a rated current pulse is much greater than the starting torque with a voltage pulse; the magnitude of the voltage pulse being that required for steady-state rated peak current in the stator. This part of the paper discusses the electromechanics of the method with current pulses fed to the stator. It is found that torque developed is proportional to the square of the magnitude of the current pulse. Variations in torque at any running speed are obtained by varying the magnitude of the current pulse. Any desired speed-torque characteristic of the motor is obtained by properly controlling the current with a current-control mechanism. Low resistance of the rotor increases the average torque developed in step starting as well as running. The analysis holds good for an unsaturated machine. View full abstract»

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  • Forces on the End Winding of Turbine-Generators I - Determination of Flux Densities

    Publication Year: 1966 , Page(s): 105 - 113
    Cited by:  Papers (5)
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    Flux densities are determined at certain points of the end, coils (field points) of turbine-generators as a result of stator and rotor currents. Coils of the stator and rotor end windings are assumed to close through the air gap and all iron boundaries are present and assumed to have infinite permeability. Stator currents considered as sources are assumed to flow as sinusoidal current sheets on cylindrical rings and washers, replacing the conical surfaces of the two layers. This is accomplished by dividing the end winding in zones by means of equally spaced z = constant planes. Only one cylindrical ring is assigned to the rotor. The coils are represented by their center lines. The field points are determined by the intersections of these center lines with the central planes of each zone. View full abstract»

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  • Forces on the End Winding of Turbine-Generators II - Determination of Forces

    Publication Year: 1966 , Page(s): 114 - 122
    Cited by:  Papers (2)
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    Electromagnetic forces on the end coils of turbine-generators, following a 3-phase short circuit from no load, are determined for different positions of the rotor, ¿ts, in the first cycle. Forces are given by F = Il ×B. Cylindrical coordinates are used. Flux density on the field points on the coils will result from stator alternating and direct currents, rotor transient currents, and, indirectly, all currents which are induced in a nonmagnetic retaining ring. Flux densities interact with total current in each coil to give forces. The total torque on the end winding is calculated at different ¿ts, and its maximum is determined. Radial forces acting on both layers are analyzed. Hence, the most severe load on the supports is determined. The normal forces on the coils are calculated. View full abstract»

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  • Theory and Performance of a Twin Stator Induction Machine

    Publication Year: 1966 , Page(s): 123 - 131
    Cited by:  Papers (8)
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    An analysis of the performance to be expected of a 3-phase squirrel-cage induction motor which has two independent sets of stator windings is made and the conclusions verified by tests. View full abstract»

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  • The Theory of Contact-Layer Behavior under a Commutating Brush

    Publication Year: 1966 , Page(s): 132 - 140
    Cited by:  Papers (1)
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    In this paper, the authors explain the various phases of the conduction process taking place in the commutator brush contact. At light loads and low speeds, the voltage drop in the contact layer is low (in the order of 0.5 volt). At increased loads, however, the trailing-edge voltage suddenly increases; this is a case of breakdown in the contact layer. Statistically, this is attributed to the fast change of entropy, now defined as the ratio of the incremental energy destroyed in the contact layer to the contact-layer voltage. Since entropy is a function of state, this indicates that a change of conduction state has taken place, bringing about a voltage rise up to 3 volts. Experimental oscillographic studies clearly confirm the existence of this phenomenon, and it should be included in commutation calculations to assess accurately the effects of commutation. View full abstract»

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  • Inductances of a Practical Slip-Ring Primitive I - An Analytical Study

    Publication Year: 1966 , Page(s): 140 - 145
    Cited by:  Papers (13)  |  Patents (5)
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    Complete inductance expressions for the windings of practical slip-ring machines are derived in terms of air-gap magnetomotive force and air-gap specific permeance. These expressions are presented in a form which facilitates verification by experiment. Deviations between the inductances of the practical and the idealized slip-ring primitive machines are-noted for a variety of winding configurations. It is shown that the existence of a nonzero third harmonic of magnetomotive force plays a significant role in the form of the cylindrical-salient and cylindrical-cylindrical inductance expressions, especially with regard to similarities between the two. Moreover, it is demonstrated that, for conditions which result in zero third-harmonic magnetomotive force in the air gap, the inductance quantities just mentioned revert to a form which, for practical machines, is consistent with that of an ideal generalized machine. View full abstract»

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  • Inductances of a Practical Slip-Ring Primitive II - An Experimental Study

    Publication Year: 1966 , Page(s): 145 - 151
    Cited by:  Papers (2)
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    Inductance and specific permeance measurements which were taken on a 3-kW salient-pole machine are presented. These measurements support both the inductance ratios and the absolute magnitude resulting from the derivations given in Part I of the paper. Some of the inductance measurements are performed in what is believed to be an original application of the approach of Jones and of Prescott and El-Kharashi which allows a continuous analog read out of change of inductance as a function of change of position. Measurements of air-gap permeance suggest certain approximations may be made with reference to saturation and the equivalent field winding at the air gap. View full abstract»

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  • A Precision Torquemeter Based on Magnetic Stress Anisotropy

    Publication Year: 1966 , Page(s): 152 - 159
    Cited by:  Papers (6)  |  Patents (1)
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    The static behavior of torque meters, based on the principle of magnetic stress-anisotropy, has been thoroughly investigated for a device configuration suitable for incorporation in a rotating shaft without loss of accuracy. A design and operating procedure has been developed which will readily yield a device having a transfer characteristic which is reproducible and linear to within plus or minus 1 percent of its rated output. With relatively simple precautions this can be improved to plus or minus 0.2 percent, and the strong possibility of improvement to 0.1 percent is indicated. View full abstract»

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  • Direct Method of Liapunov Applied to Transient Power System Stability

    Publication Year: 1966 , Page(s): 159 - 168
    Cited by:  Papers (44)
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    The direct method of Liapunov is applied to the problem of power system stability. The method is first compared with the phase plane technique and equal-area criterion, with all three approaches giving identical results for the equivalent 1-machine system. A Liapunov function for the 3-machine system is developed, and conservative prediction of stability is possible if the machine velocities and angles are known at the time of final system disturbance. The method is easily extended to multimachine systems. Further work is needed in the area of easier determination of better Liapunov functions and the inclusion of such items as resistance, regulator action, governor action, and damping torques. View full abstract»

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  • Transient Stability Regions of Multimachine Power Systems

    Publication Year: 1966 , Page(s): 169 - 179
    Cited by:  Papers (93)
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    Analysis of the stability of power systems following a transient disturbance involves the study of a large set of nonlinear differential equations. A new approach to the quantitative study of the transient stability of large power systems is presented, using the second method of Liapunov. A region of asymptotic stability for the postfault system is obtained through Liapunov theorems. If the initial conditions of the postfault system at the time of switching to restore normal operation lie within this region, the system will be stable. The extreme value of the time at which the conditions of the system are at the boundary of the region of asymptotic stability gives the critical switching time. A general description of a digital computer program and the results of its application to a 4-machine system are given. View full abstract»

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  • Improvement of System Stability by Switched Series Capacitors

    Publication Year: 1966 , Page(s): 180 - 188
    Cited by:  Papers (73)  |  Patents (1)
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    Improvement of transient stability of a 2-circuit ac transmission link by use of switched series capacitors is analyzed by equal-area diagrams for two kinds of disturbances: 1) a permanent fault on one ac circuit, cleared by opening a section of that circuit, without reclosure and 2) a permanent fault on a dc line operating in parallel with the ac line. In both cases, the aggregate megavar rating of series capacitors required for a given transient stability limit is shown to be smaller if some capacitors are switched than if all are unswitched. Moreover, the scheme with switched capacitors reduces the angular swing of the machines and the fluctuation of load voltages during the swing. View full abstract»

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  • Contributors

    Publication Year: 1966 , Page(s): 189 - 190
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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