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Power Apparatus and Systems, IEEE Transactions on

Issue 8 • Date Aug. 1981

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Displaying Results 1 - 25 of 51
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1981 , Page(s): c1 - 4123-c
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1981 , Page(s): c2
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    Freely Available from IEEE
  • A Rate Type Constitutive Equation for the Description of the Corona Effect

    Publication Year: 1981 , Page(s): 3681 - 3685
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1005 KB)  

    A rate type model for the description of the corona effect is proposed. It includes the relaxation properties of an electric line due to the presence of the corona effect. Any perturbation propagates with a constant speed-a characteristic of the line. The constants of the model may be determined from the experimental data [1,2,3]. The model may be used to study wave attenuation due to corona discharges. This attenuation is caused by both the electric "viscosity" of the dielectric and the tail of the wave. View full abstract»

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  • The Complex Ground Return Plane a Simplified Model for Homogeneous and Multi-Layer Earth Return

    Publication Year: 1981 , Page(s): 3686 - 3693
    Cited by:  Papers (118)
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    For modelling current return in homogeneous ground, the paper introduces the concept of an ideal (superconducting) current return plane placed below the ground surface at a complex distance p equal to the complex penetration depth for plane waves. This "complex" plane appears as a mirroring surface, so that conductor images can be used to derive very simple formulae for self and mutual impedances under ground return conditions. Such equations, without proofs, were originally proposed by Dubanton and published by Gary.1 In this paper, plausibility arguments serve to initially justify the procedure, then the equations are analytically related to those of Carson and, finally, the errors, which in most cases are less than a few percent, are numerically evaluated. The ideal return plane at complex depth can also be used for multi-layer earth return. View full abstract»

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  • Particle-Initiated Breakdowns in Compressed Gas Insulation Under Time-Varying Voltages

    Publication Year: 1981 , Page(s): 3694 - 3702
    Cited by:  Papers (16)
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    The need is growing for an analytical model to describe the performance of particle-contaminated compressed gas insulation. The model should take into account the wide practical variety of particle shapes and sizes, insulation configurations, applied voltage magnitudes and wave forms, and gas pressure. This work introduces 'Breakdown Voltage Profile' as an attempt in that direction. The profile offers a description of the instantaneous breakdown voltage as a function of the location of a given particle within the gaseous insulation. The profile explains and, in turn, predicts such characteristics as critical particle position and free-particle and fixed-particle breakdown voltages. When properly combined with the particle moving trajectory under a transient (impulse) or steady state voltage, the profile enables the determination of the critical voltage magnitudes. View full abstract»

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  • System Restoration Plan Development for a Metropolitan Electric System

    Publication Year: 1981 , Page(s): 3703 - 3713
    Cited by:  Papers (40)
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    The extended duration of recent major power system disturbances have indicated the need for development of system restoration plans (SRP), which would minimize the time required for restoration of service. This paper presents an efficient approach to SRP, from a complete collapse under peak-and light-load conditions, developed at Potomac Electric Power Company (PEPCo). The method is based on: (a) the combined effort of operating personnel and system analysts, (b) the access to data available from the on-line computer facilities, and (c) the use of an interactive load flow program. The SRP development procedure and the results described in this paper are of general interest in that they can be adopted and applied to the other electric systems. View full abstract»

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  • Two Stage Solution of Three Dimensional Electrostatic Fields by Finite Differences and Finite Elements

    Publication Year: 1981 , Page(s): 3714 - 3721
    Cited by:  Papers (1)
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    Normal confi. gurations and accuracy requirements can easily result in an excessive number of nodes in a three dimensional grid. A computer program is described, which circumvents this problem by a two stage solution. The first stage employs a fairly coarse three dimensional grid. This initial calculation is only used to provide boundary potentials for a final two dimensional calculation, near the most highly stressed electrode. View full abstract»

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  • A Two-Level Static State Estimator for Electric Power Systems

    Publication Year: 1981 , Page(s): 3722 - 3732
    Cited by:  Papers (39)
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    A hierarchical concept is used to solve the static state estimation problem for large-scale composite power systems. The solution is obtained by performing a two-level calculation. In the lower level, a conventional state estimation is carried out simultaneously for all subsystems. The coordination of these local estimations is realized in the upper level. One of the main contributions of the paper lies in the construction of an appropriate second-level algorithm. Its suitability and also the main features of the overall procedure are then explored and illustrated on the basis of the Belgian 380-220-150 kV transmission network. Comparisons with the standard "integrated" state estimation are also performed. View full abstract»

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  • Flashover Voltage Characteristics of Contaminated Bushing Shells for UHV Transmission Systems

    Publication Year: 1981 , Page(s): 3733 - 3743
    Cited by:  Papers (2)
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    This paper describes the power frequency withstand voltage test results of contaminated bushing shells for UHV transmission systems up to 15 m under fog condition. Described first are the facilities for testing such tall bushing shells of a large diameter. The test results show a linearity in relationship between effective length and withstand voltage both by the fog withstand method and the equivalent fog method. Assessment of 20 different shed shapes is made. The relation between average diameter and withstand voltage can be expressed in a quadratic curve. View full abstract»

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  • Analysis of Conductor Galloping Field Observations - Single Conductors

    Publication Year: 1981 , Page(s): 3744 - 3753
    Cited by:  Papers (3)
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    Phase-to-phase clearances often are increased in the design of overhead lines to minimize flashovers caused by galloping of ice-coated conductors in regions where that occurs. A collection of reports of the observed galloping behavior of operating lines has been analyzed with the objective of formulating improved guides for selection of increased clearances. Results of the analysis show the effects on galloping amplitudes of such line design parameters as span length and tension. View full abstract»

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  • Explicit Load Flow Series and Functions

    Publication Year: 1981 , Page(s): 3754 - 3763
    Cited by:  Papers (4)
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    When expressed in rectangular coordinates, the basic load flow equations consist of n quadratic equations for power in: terms of n voltage variables. In this paper, a series reversion technique is employed to express the-n voltage variables as an explicit-power series in the power variables. Two different series are presented. The first is a Taylor series for voltage in terms of power while the second has a fixed point iteration origin with near Newton properties. The series have the potential to generate explicit load flow functions which can evaluate alternate loading conditions very rapidly. View full abstract»

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  • An Accelerated Life Test for Evaluating Power Cable Insulation

    Publication Year: 1981 , Page(s): 3764 - 3774
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6263 KB)  

    For many years, the power cable industry has sought an accelerated test that would quantitatively evaluate the life of polyethylene insulation for high voltage cables. This paper describes preliminary results leading to development of such a test. This test employs full size cables with accelerating factors such as temperature, water, electrical stress, frequency and mechanical stress. Times-to-failure for thernnplastic and crosslinked polyethylene insulation materials are canpared at different temperatures and the effect of water in the strand is illustrated. Data are presented showing the performance differences of two peroxide comipounds in crosslinked polyethylene. The influence of a tree-retardant additive to thermo-plastic polyethylene is described. General observations are made of the failure mode and nature of tree formation in test specimens. View full abstract»

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  • On-Line Algorithms for Forecasting Hourly Loads of an Electric Utility

    Publication Year: 1981 , Page(s): 3775 - 3784
    Cited by:  Papers (44)
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    A method which lends itself to online forecasting of hourly electric loads is presented and the results of its use are compared to models developed using the Box-Jenkins method. The method consits of processing the historical hourly loads with a sequential least-squares estimator to identify a finite order autoregressive model which in turn is used to obtain a parsimnious autoregressive-moving average model. View full abstract»

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  • Accurate Calculation of Asymmetrical Fault Currents in Comples Power Systems

    Publication Year: 1981 , Page(s): 3785 - 3790
    Cited by:  Papers (2)
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    This paper describes an efficient method for accurate calculation of system asymmetrical short circuit currents for both balanced and unbalanced faults. The method uses a Fourier transform technique to calculate the unidirectional component of the short circuit current and a transient stability program to compute the alternating component. The proposed method is validated by comparing its results with those of a detailed time domain simulation. View full abstract»

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  • An Orthogonal Row Processing Algorithm for Power System Sequential State Estimation

    Publication Year: 1981 , Page(s): 3791 - 3800
    Cited by:  Papers (43)
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    In this paper a sequential algorithm for power system state estimation based on the use of Givens rotations is investigated. The fact that the rotations are orthogonal transformations assures the numerical stability of the algorithm. The Jacobian matrix is processed one row at a time, and sparsity can be easily exploited. Also, the method presents some features which are advantageous from the point of view of bad data detection, identification and elimination. Both the description and the implementation of a fast version of the Givens rotations are presented. The method is applied to three different power systems, including real size networks, and the results are used to assess its performance. View full abstract»

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  • SLF Innterruption by a Gas Circuit Breaker Without Puffer Action

    Publication Year: 1981 , Page(s): 3801 - 3810
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5439 KB)  

    A full size model gas circuit breaker without puffer has been built and tested based on a new arc quenching principle of self-flow generation. The breaker generates the flow around current zero due to the pressure rise in the cylinder by positive utilization of nozzle clogging phenomenon. The test was carried out on BTF and SLF conditions prescribed in IEC standards. The breaker successfully interrupted 40 kA for BTF and SLF respectively at 84 kV. Based on the test results and the theoretical analysis of the self-flow generating behavior, it is remarked that the new arc quenching principle is more effective to get higher fault clearing capability compared with the puffer principle. View full abstract»

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  • Large-Scale Implementation of Modal Dynamic Equivalents

    Publication Year: 1981 , Page(s): 3811 - 3817
    Cited by:  Papers (1)
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    Earlier work has shown that unreduced modal dynamic equivalents can produce significant savings in power system transient stability computation time with acceptable accuracy. However, all prior work on modal equivalents has been based on relatively small test systems. The extension of this technique to large-scale systems is a necessary step to prove its usefulness in practical power system analyses. View full abstract»

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  • Load Response Coefficients Monitoring System : Theory and Field Experience

    Publication Year: 1981 , Page(s): 3818 - 3827
    Cited by:  Papers (16)
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    The active and reactive powers, at a high voltage bus level, have generally been modelled either as functions of the time of the day or as load response functions of voltage and frequency changes (at a given time). The study of the dependence of these load response coefficients on time and weather has not been possible until now, since the determination of these coefficients required test perturbations. A mobile mini-computer based load response coefficient monitoring system has been conceived and tested, based on an estimation procedure requiring no test perturbations. Results, including the load response coefficients at about 6-minute intervals, from the operation of the system, at two Hydro-Quebec 120 kV substations, are also presented. View full abstract»

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  • Practical Use of "Siolap" Insulated Oil-Filled Cables

    Publication Year: 1981 , Page(s): 3828 - 3838
    Cited by:  Papers (2)
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    SIOLAP is the laminated paper composed of high density crosslinked polyethelene film and kraft paper. Using this SIOLAP as insulating paper 275kV self-contained oil-filled cable (OF cable) has been manufactured and also its physical, dielectric and mechanical performance has been examined for practical use. Furthermore, a long term field test of the cable and its accessories has been carried out. As the result of the test, the firm prospect of practical use of the cable and its accessories has been obtained. In addition, we have now gained a hopeful outlook for practicability of SIOLAP insulated 500kV OF cables. View full abstract»

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  • Ground Switch Interrupting Duty and Total Ground Current Imposed by Induction from Parallel Transmission Lines

    Publication Year: 1981 , Page(s): 3839 - 3845
    Cited by:  Papers (7)
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    Induction from parallel energized circuits imposes an interrupting duty on ground switches and causes the injection of currents in the ground at switch locations. Both the electrostatic and the electromagnetic induction levels are given for the different voltage class combinations between the energized and the de-energized circuits in the range 69 kV to 1150 kV. A comprehensive study of the factors affecting the induction levels is included. The electromagnetic induction levels are shown to be much higher than the electrostatic induction levels. It is also shown that the maximum ground switch interrupting duties exceed the capabilities of many existing installations. View full abstract»

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  • Appendix-Summary of Reference (1) Ground Switch Interrupting Duty and Total Ground Current Imposed by Induction from Parallel Transmission Lines Part I-Theoretical Analysis

    Publication Year: 1981 , Page(s): 3846 - 3849
    Cited by:  Papers (5)
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    First Page of the Article
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  • The Calculation Magnetic Coupling from Overhead Transmission Lines

    Publication Year: 1981 , Page(s): 3850 - 3860
    Cited by:  Papers (6)
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    Magnetic coupling to buried conductors, such as pipelines, on the right-of-way is a function of the transmission line's longitudinal electrical field (LEF) which is proportional to the phase current. A rigorous solution for the LEF uses Carson's series and requires the use of a computer or programmable calculator. View full abstract»

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  • Dielectric Strenght of N2-He Mixtures and Comparison with N2-SF6 and CO2-SF6 Mixtures

    Publication Year: 1981 , Page(s): 3861 - 3869
    Cited by:  Papers (5)
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    The N2-He gas mixture has been studied in order to validate and extend Olivier' s5 equation to gas mixtures. Normalized curves were drawn and have permitted us to check the independance of the relation betwen the breakdown voltage U and the gas ratio n1/n from the test conditions for the N2-He, SF6-N2 and SF6-CO2 gas mixtures. Finally, results from several authors were reported to confirm our results and to verify the relation introduced in this paper. View full abstract»

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  • Station Originated Multiple Outages in the Reliability Analysis of a Composite Generation and Transmission System

    Publication Year: 1981 , Page(s): 3870 - 3878
    Cited by:  Papers (14)
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    Station originated outages resulting in line and/or generating unit outages can occur in a power system because of faults on breakers, stuck breaker conditions, bus faults, etc. They are normally of short duration but can result in multiple circuit and/or generating unit outages. The effect of such outages on reliability indices of a composite generation and transmission system can be significant. View full abstract»

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  • Coordinated Multi-Machine Stabilizer Settings Without Eigenvalue Drift

    Publication Year: 1981 , Page(s): 3879 - 3887
    Cited by:  Papers (11)
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    The stabilizing requirements for various mechanical mode oscillation frequencies are explored for a thermal unit, anuclear unit and a hydro unit of a portion of an operating system by means of a complex frequency method. The dynamic interaction effects between various modes of the machines are found to have significant influence on the stabilizer settings of the machines, and are therefore included in the computation of the mechanical mode eigenvalues of the machines as equivalent damping and synchronizing torque coefficients. 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