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Power Apparatus and Systems, IEEE Transactions on

Issue 5 • Date Sept. 1972

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Displaying Results 1 - 25 of 70
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1 - 2254-b
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
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    Freely Available from IEEE
  • Algorithm for Formation of Loop Admittance Matrix

    Page(s): 1743 - 1749
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    This paper derives the algorithm for building the loop admittance matrix. The algorithm is found by obtaining the dual of the algorithm for the formation of the bus impedance matrix. An application of the algorithm is presented. View full abstract»

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  • Bibliography on Power Capacitors 1967-1970

    Page(s): 1750 - 1759
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    This report was prepared as an activity of the Working Group* of the Capacitor subcommittee of the IEEE Committee on Transmission and Distribution, to extend the existing bibliographies through the years 1967-1970. A total of 208 articles are referenced and classified, which includes both shunt and series capacitors, relative to economics, designs and applications. Many foreign language papers are listed. An index of Authors and a List of Periodicals are also included. View full abstract»

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  • Frequency-Modulated Fault Locator for Power Lines

    Page(s): 1760 - 1768
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    This paper describes the use of frequency-modulated radar techniques for accurate location of faults on power transmission lines. It includes the design of a prototype frequency-modulated fault location system. Test results of this system operating on a simulated transmission line are also included. View full abstract»

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  • Effect of Elevated Temperature Operation on the Strength of Aluminum Conductors

    Page(s): 1769 - 1772
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    The relationships between "remaining strength", time and temperature for conductors operated at elevated temperatures are presented as empirical models based on elevated temperature test results. The comparison between the remaining strength predicted from the models and the measured remaining strength is shown. Use of the models is explained and examples of their use are presented. View full abstract»

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  • Approach to Experimental Electric Power Engineering Education

    Page(s): 1773 - 1780
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    The development of a new electrical machines laboratory is discussed. The objectives and the underlying philosophy for achieving a physical understanding of machines are stated. The fractional-horsepower-size equipment newly developed and some typical experiments are described. View full abstract»

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  • A Generalized Symmetrical Component Transformation for Clyindrical Electrical Machines

    Page(s): 1781 - 1786
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    A generalized form of the conventional polyphase symmetrical component transformation is proposed. This includes time dependent phase shifts. It is applied directly to the dynamical equations of a polyphase induction machine and it is shown that the system differential equations are greatly simplified by appropriate choice of the phase shift functions. The physical meaning of the sequence components is explained in terms of machine mmf and flux harmonics. View full abstract»

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  • Analysis of Even Order MMF Harmonics in Squirrel Cage Induction Motors

    Page(s): 1787 - 1794
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    Even harmonics of mmf are produced whenever the excitations on the separate poles of a winding are unequal as in some starting connections used in single phase motors or in certain consequent pole windings. The analytical methods developed in this paper are applicable to any three-winding squirrel cage induction machine with arbitrary mmf distribution in all three windings. A center-tapped main winding single phase motor is used as an example and the reduction in performance caused by even harmonics is shown both analytically and experimentally. The theory is applicable to both steady state and dynamic performance and illustrative results for the transient performance of the sample motor are included. Application of the method to three phase machines is discussed. View full abstract»

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  • Determination of Waterwheel Alternator Transient Reactances from Flux Plots

    Page(s): 1795 - 1802
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    In the transient analysis of salient pole alternators, the reactances X'd and X'q are assumed to be constants. In saturated machines, however, these reactances are functions of the pre-transient load of the alternator. For more exact analyses saturated reactances should be used. The expression of rotor quantities in stator terms, or vice versa, at nonlinear condition is explained. The operational impedances Xd(p), Xq(p) and the various time constants of alternators without amortisseur windings are developed from leakage reactance concepts. After a first approximation of the transient reactances is obtained from the operational impedances, a step-by-step correction procedure is used for finding the operationally dependent direct transient reactance. This is obtained from a simulated dynamical test. Only a few step-by-step corrections are necessary to yield good values for the transient reactances. Since there is a slight difference between Xq and X'q, the analysis will concentrate only to X'd. Notations not explained here are the same as in Concordia [1]. The analysis is applied to a General Electric alternator with nameplate data 82.5 MVA, 16.5 kV, wye-connected, 40 poles and 60 Hz, described in [2]. View full abstract»

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  • Rotor Current and Magnetic Field Variations in Induction Motors with Skewed Rotors

    Page(s): 1803 - 1811
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    Published methods of calculating induction motors do not reflect the effect of skew on the magnetic field in the air gap. The rotor bar current as affected by skew alters the total mutual field. This paper determines the voltages induced in both the rotor bar and the primary winding as affected by the said modified field and provides equations to calculate its effect on performance. This paper also analyzes the field resulting from non-skewed stator conductors carrying line current and skewed rotor conductors carrying rotor bar current. Rotor current is calculated in terms of individual bar currents; present techniques use uniform current sheet distribution. Equations are given to calculate motor performance reflecting the effect of skew on the mutual field. View full abstract»

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  • Experimental Study of Solid-Rotor and Composite-Rotor Induction Motors

    Page(s): 1812 - 1820
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    Experimental results obtained from the tests made on a three-phase induction motor with different solidiron as well as composite rotors are presented in this paper. These are compared with the theoretical predicted characteristics based on existing analytical as well as numerical analyses. The limitations in applying different theories for prediction of performance are discussed. View full abstract»

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  • Slot Impedance of T-Shaped Conductor with Idle Bar

    Page(s): 1821 - 1826
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    A new equivalent circuit is given to simulate the slot impedance of a T-shaped conductor with idle-bar. Calculations are included for the evaluation of slot impedance with single-rectangular conductor, single rectangular conductor with idle-bar, T-shaped conductor and T-shaped conductor with idle-bar respectively. Good agreement was obtained with measured results. View full abstract»

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  • Interchange Capability and Contingency Evaluation by a Z-Matrix Method

    Page(s): 1827 - 1832
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    A technique is described that permits the determination of the amount of power which can be imported from (or exported to) neighboring companies, without overloading "limiting" lines during an emergency situation, when certain "key" lines are out of service. The method is a multiple contingency extention of a technique described earlier.[1] The advantage of the method is the reduction in computer running time, as compared to the time required to obtain the equivalent information by complete power flow solutions, for the several conditions to be studied. The program has been extensively used with good success.[2] View full abstract»

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  • Functional Optimization of Common-Flow Hydro-Thermal Systems

    Page(s): 1833 - 1839
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    A functional analytic optimization technique is applied to the Problem of optimum scheduling of hydro-thermal power systems. The power system considered contains two hydro-plants on the same stream. The time delay of flow between upstream and downstream plants is taken into consideration. The problem is formulated as an abstract minimum norm problem. The optimal solution found here satisfies the necessary conditions of variational calculus for control problems with delayed arguments. A generalized contraction mapping technique is applied to a sample system to illustrate the results obtained. View full abstract»

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  • Generalized Representation of Generator Excitation Power Requirements

    Page(s): 1840 - 1847
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    Generalized relations for generator excitation power requirements are given for steady-state excitation, transient field forcing, and power damping operations. These relations give the excitation power in per-unit, on the generator MVA base, as a function of the generator per-unit reactances and field time constant. The effect upon power damping of drawing the required excitation power from the main generator shaft is also investigated. It is found that, in general, the effect of powering the exciter from the main generator is to reduce the amount of damping that can be provided by excitation control. However, in the case of a topical conventional generator, the resultant reduction in damping is usually so slight (about 2%) as to be negligible. View full abstract»

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  • Brushless Thyristor Excitation Systems.

    Page(s): 1848 - 1854
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    This paper shows how brushless thyristor excitation systems for large synchronous generators are being evolved in the authors' organisation, outlines the electrical and mechanical advantages that accrue, and includes some results of a digital computer comparison of such systems with other forms of excitation. View full abstract»

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  • Test Analysis and Calculation of Polyphase Hysteresis Motors

    Page(s): 1855 - 1862
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    This paper presents a method of analyzing hysteresis motors for their parameters, gross power, losses and magnetizing ampere turns. A method is shown for calculating performance from either calculated or tested parameters. A synthesis method is given for determining rotor ring thickness. View full abstract»

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  • Current Considerations on the Seismic Design of Nuclear Power Station Equipment

    Page(s): 1863 - 1869
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    The introduction of seismic design criteria into specifications for nuclear power plant equipment has significantly complicated the role of the electrical equipment manufacturer. The intent of this paper is to explain a few of the basic concepts utilized in earthquake analysis and to illustrate how the seismic design criteria can be satisfied. View full abstract»

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  • Starting Transients in Induction Motors with Inertia Loads

    Page(s): 1870 - 1874
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    Direct-on-line starting of the polyphase induction motor coupled to a mechanically resonant load is studied by numerical integration of the nonlinear system equations and is shown to be capable of generating excessively large electromechanical torque peaks during transients. This study is supplemented by the modal approach which identifies the causes to be: (1) the excitation of the line frequency oscillating transient torque component which arises from the interaction of the line currents and the dominant mode currents and, (2) the possibility of mechanical amplification of this oscillating torque component when the resonant frequency of the shaft is close to the line frequency. View full abstract»

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  • Electrical Features of Raccoon Mountain Pumped-Storage Plant

    Page(s): 1875 - 1880
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    This paper describes unique features of the electrical equipment and some of the considerations involved in its selection for a 1,700-MVA underground pumped-storage project with four reversible pump/turbines. Considerations of cost and maintenance of the machines, transmission system, and powerhouse construction led to selection of generator/motors with direct water-cooled stator and rotor windings, static-converter synchronous starting of pumps with synchronous dynamic braking, use of generator circuit breakers, and underground main transformers with self-contained 161-kV single-section cables having 1,100-ft change in elevation. View full abstract»

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  • Measurements of Transient Skin Effect within Nonlinear Conductors

    Page(s): 1881 - 1886
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    An experimental study of transient current density distribution within a nonlinear conductor is presented. The study was performed by applying impulse currents to a model of the conductor. A new measuring method was developed which permits the recording of current density at chosen points within the conductor model. The method was verified on a linear conductor model and a compatible agreement between the measured and calculated results was obtained. View full abstract»

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  • Transient Recovery Voltages Associated With Power-System, Three-Phase Transformer Secondary Faults

    Page(s): 1887 - 1896
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    Measurements of power-system three-phase transformer resonant frequencies under fault conditions are analyzed and related to the transient recovery voltage appearing across a fault-interrupting device. Frequencies and time-to-peak values are derived that can be used to establish test standards for interrupting devices. View full abstract»

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  • Voltage Escalation in the Switching of the Motor Control Circuit by the Vacuum Contactor

    Page(s): 1897 - 1903
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    A turn-to-turn fault of a high-voltage motor which was controlled by a vacuum contactor prompted this study. The study revealed that a voltage escalation can certainly occur by the repetition of re-ignitions as indicated by recent several papers,1,2, but the cause of the escalation is different from that reported. This paper presents a new theory for the voltage escalation, makes clear the conditions for the occurrence of the escalation, and leads to the conclusion that protectors are indispensable in the application of the contactors to the motor control circuit. View full abstract»

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  • Bibliography of Switchgear Literature

    Page(s): 1904 - 1909
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    This bibliography was prepared for the IEEE Education, Recognition and Planning Subcommittee of the IEEE Switchgear Committee to be used as a reference for switchgear education. The references essentially cover the period of time from 1958 through 1968 with a few papers preceding this period. The last complete bibliography appeared in the AIEE Transactions, Vol. 61, pp. 1077-1100, 1942. It is expected that these references will be updated on a regular basis hereafter. 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