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Power Apparatus and Systems, IEEE Transactions on

Issue 11 • Date Nov. 1982

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

    Publication Year: 1982 , Page(s): c1 - 4440-b
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1982 , Page(s): c2
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    Freely Available from IEEE
  • Saturated Transformer Inductances Determined By Energy Perturbation Techniques

    Publication Year: 1982 , Page(s): 4185 - 4193
    Cited by:  Papers (4)
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    The effect of perturbation of currents of multi-winding transformers, on the stored magnetic energy in the magnetic field associated with these apparatus is used to calculate the saturated incremental, apparent and effective self and mutual winding inductances. The method is applied here to single phase and three phase transformers. A finite element magnetic field model is used to calculate the energy stored in the magnetic field associated with such transformers. The numerically calculated inductances are in good agreement with those obtained from test. The results of this work reveal that in three phase transformers various winding self and mutual inductances cannot be considered constant or independent of time and level of excitation, throughout an ac cycle of operation. This method, enables one to determine incremental values of transformer inductances during the design stage. Knowing such parameters before construction of hardware is most significant in the dynamic analysis and design of static solid state power conversion equipment, and may help avoid costly design modifications of such apparatus. View full abstract»

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  • Torque And Force Distribution in the Superconducting Alternator

    Publication Year: 1982 , Page(s): 4194 - 4203
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    The study of the torque and force distributions in a superconducting alternator shows that certain combinations of stiffness and inertia constant of the rotor screens can cause very large resonance torques and forces. The free outer rotor can also resonate. An effective means of avoiding the resonance is suggested and discussed. A method of transferring oscillating torques from the weaker member to the stronger one, without loss of adequate screening, is also presented. View full abstract»

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  • Digital Protection of Power Transformer Based on Weighted Least Square Algorithm

    Publication Year: 1982 , Page(s): 4204 - 4210
    Cited by:  Papers (13)  |  Patents (1)
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    The paper presents a new weighted leastsquare scheme for differential protection of power transformers using digital techniques. The differential current waveform is modelled as a sum of decaying dc, fundamental and selected higher harmonic components. The model coefficients are established by using a least-square filtering technique for the sampled data. A root mean square error criterion is established to select the proper harmonic orders, data window, weighting matrix and sampling rate for fast detection of internal faults and high restraint against energising transients in transformers. A variety of simulated waveforms is presented to highlight the important features of this algorithm. The results clearly demonstrate the efficacy and weakness of the weighted least square model. View full abstract»

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  • High-Response Excitation Systems on Turbine-Generators: A Stability Assessment

    Publication Year: 1982 , Page(s): 4211 - 4221
    Cited by:  Papers (7)
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    This paper provides the power system designer with some guidelines concerning what measure of stability improvement can be expected with highresponse vs. normal response excitation systems for turbine-generators. Transient and oscillatory stability study results are illustrated showing how critical fault clearing time (CFCT) and unit damping performance vary as a function of excitation system response characteristics. The results show CFCT gains under most conditions to be quite small. View full abstract»

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  • Solution of Eddy Current Problems Using Three Dimensional Finite Element Complex Magnetic Vector Potential

    Publication Year: 1982 , Page(s): 4222 - 4229
    Cited by:  Papers (5)
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    The three dimensional finite element formulation of eddy current problems with ac sinusoidally time varying excitations is given using magnetic vector potential and complex phasor representation. First order tetrahedral elements are utilized. In this formulation, magnetic saturation is neglected. Three values of magnetic reluctivity, vx, vy and vz, are defined within each tetrahedral element, while it is assumed that in tetrahedrals laying in conducting material one value of electrical conductivity,¿, is valied in the x, y and z directions. The method was applied to the calculation of the eddy current losses at 60 Hz in a finite length aluminum bar of square cross-section, which was excited by a surrounding coil with considerable three dimensional end effects. These losses under identical conditions were determined in the laboratory, and the results of calculation and measurement are in substantial agreement. This confirms the validity of use of this method for more complex applications including calculation of induced eddy current losses in metalic structures surrounded by three dimensional fields, such as in structures near power transformer windings, and similar situations. View full abstract»

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  • The Calculation of Overpressure in Metal-Enclosed Switchgear Due to Internal Arcing

    Publication Year: 1982 , Page(s): 4230 - 4236
    Cited by:  Papers (8)
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    The mechanical stress of metal-enclosed switchgear installations due to fault arcs can be predicted by means of pressure calculation. In this paper a number of calculation methods is discussed. The results of pressure calculation are compared with pressure measurements performed in model switchgear cubicles. It is shown, that simplifying assumptions in some calculation methods lead to inaccurate results. Pressure calculation for switchgear cubicles with effective pressure relief openings should take into account the spatial limitation of arc energy input. View full abstract»

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  • Development and Field Experience of Digital Protection and Control Equipment in Power Systems

    Publication Year: 1982 , Page(s): 4237 - 4244
    Cited by:  Patents (1)
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    In applying microelectronic techniques to protective and control equipment in the power system, there is an important subject to be solved, which is the assurerance of long-term reliability. From this viewpoint, countermeasures against environmental conditions, for example temperature rise, electro-magnetic interference and dust are reconsidered. View full abstract»

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  • A Local Control Strategy For Power Systems in Transient Emergency State Part I: Functional Design

    Publication Year: 1982 , Page(s): 4245 - 4253
    Cited by:  Papers (6)
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    This paper is concerned with the investigation of a systematic corrective control approach for the transient emergency state problem of the power system. The proposed new control framework involves distributing the task of system transient stability margin improvement among several local facilities dedicated to the various subsystems comprising the power system. The functional design of the various local controllers to undertake local information processing and provide appropriate closed-loop stabilizing control action during severe transient disturbance is presented. An illustrative example is included to demonstrate the effectiveness of the proposed local control framework. View full abstract»

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  • A Local Control Strategy Power Systems in Transient Emergency State Part II: Implementation and test Results by Simulation

    Publication Year: 1982 , Page(s): 4254 - 4262
    Cited by:  Papers (4)
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    The functional design of a local control strategy considered suitable for bulk power system disturbed into transient emergency state was set forth in the companion paper [1]. It utilized a particular control procedure based on an adaptively specified angle- velocity threshold limit criteria. In order to consolidate the validity of the strategy, this paper describes its algorithmic implementation and discusses two extensive test results. The design philosophy and implementation of the proposed control framework are based on the hierachical control approach. View full abstract»

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  • System Restoration - Deploying the Plan

    Publication Year: 1982 , Page(s): 4263 - 4271
    Cited by:  Papers (2)
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    This paper is one of a series prepared for use in Current Operational Problems (COPs) forums with the goal of focusing the attention of the industry on high priority problems faced by those who are involved in the actual operation of power systems. View full abstract»

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  • Suppression of Static Electrification of Insulating Oil for Large Power Transformers

    Publication Year: 1982 , Page(s): 4272 - 4280
    Cited by:  Papers (8)
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    Streaming electrification of large power transformers is discussed here from the standpoint of characteristics of insulating oils used in them. View full abstract»

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  • Nonlinear Frequency Dependent Transformer Model for Electromagnetic Transient Studies in Power Systems

    Publication Year: 1982 , Page(s): 4281 - 4288
    Cited by:  Papers (24)
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    Transformer models for system studies derived without taking into account the frequency dependency of its magnetizing branch are not adequate for representing the transformer performance over a wide range of frequencies and operating conditions. This paper describes a procedure for taking into account the frequency dependent characteristics of the transformer based on an analysis of the electromagnetic field distribution within the laminations of the transformer core. A one dimension linear diffusion problem is analyzed. A simple linear equivalent circuit of the Norton type is synthetized. This circuit is an exact representation of the transformer at any frequency and for any type of excitation. View full abstract»

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  • Bibliography of gas insulated substations

    Publication Year: 1982 , Page(s): 4289 - 4315
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    This bibliography was prepared for Working Group 70.1 on Gas Insulated Substations of the IEEE Substation Committee. Certain entries were published in the IEEE Transactions on Power Appatatus and Systems Vol. PAS-94, No. 4, July/August 1975, pp. 1425-35; Vol. PAS-96, No. 4, July/August 1977, pp. 1280-87; and Vol. PAS-99, No. 1, January/February 1980, pp. 389-401. Due to the growth of research undertaken and application of gas insulated equipment with comensurate increase in volume of source material and subjects treated, the entries are presented in 24 categories and are updated to include over 200 new articles. The 770 entries are arranged in three main groups and each is further divided into more specialized categories. They are presented in chronological order for each category. Indexes of authors and source publications are provided for easier reference. In order td conserve space, each entry is listed under one category only, even though most papers do overlap and cover more than one subject. The reorganizati6n of subjects and updating of entries was made by R. Matulic. View full abstract»

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  • AC Fog Withstand Test on Contaminated Insulators by Steam Fog

    Publication Year: 1982 , Page(s): 4316 - 4323
    Cited by:  Papers (3)
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    This paper describes the results of an investigation into how steam fog parameters affect the withstand voltage of artificially contaminated insualtors by the fog withstand method. We established the correlation between the steam flow rate and liquid water content of the fog. The fog withstand voltage showed a lower value with little dispersion at about 3 to 10 g/m3 of the maximum liquid water content. The minimum fog withstand voltage agreed well with the minimum flashover voltage obtained under natural conditions. We suggest that, for the fog withstand test using steam fog, the ideal fog condition would be about 3 to 7 g/m3 of the maximum liquid water content of the fog. View full abstract»

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  • Computer Graphics Production of Switchgear Engineering Drawings

    Publication Year: 1982 , Page(s): 4324 - 4332
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    The opportunities for applying coomputer graphics and com puter-aided design (CAD/CAM) to switchgear engineering drawings are examined in a case study of one switchgear manufacturer's computer system. This system is of unusual interest because it is particularly strong in two features which are seldom achieved: 1) flexibility in drawing layout and content, and 2) greater computer assistance in most steps in producing engineering drawings. An explanation of the choices, and capabilities in computer- aided design systems for switchgear is presented. In addition, guidelines in designing or choosing a system that allows flexibility and maximum computer assistance in producing the drawings are noted. View full abstract»

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  • Optimal Expansion of Transformer Substations

    Publication Year: 1982 , Page(s): 4333 - 4340
    Cited by:  Papers (1)
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    Due to the increasing demand for electrical energy, the transmission capacity of existing power transformer substations must be correspondingly increased to prevent their overloading. This paper represents a new method for the optimal expansion for such substations. The optimized objective function includes the total annual cost of both the original already existing power transformers and the new parallel connected additional transformer. The independant variables for the optimization process are the power rating and the main geometrical dimensions of the new transformer. These variables affect not only the electrical parameters of the new transformer, but also govern the load sharing between the original transformers and the new one. Any condition yielding overloading of either of them is to be excluded. The results will strongly depend on the electrical and magnetic loadings assumed. It is shown that for a certain value of the new transformer core flux density, an absolute minimum for the total substation annual cost exists, whereas increasing the current density will result a monotonous decrease of the objective cost function. The new method is applied to a practical example, and several checks for its validity are given. View full abstract»

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  • Development of 77 KV 40 MVA Gas-Vapor Cooled Transformer

    Publication Year: 1982 , Page(s): 4341 - 4349
    Cited by:  Papers (3)
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    A 77 KV 40 MVA gas-vapor cooled transformer has been developed as a prototype of substation transformers, which is directed to nonflammable and lightweight properties. To examine the operating reliability of the transformer, the reliability test has continued since July, 1981 at the Hokusetsu substation of KEPCO (Kansai Electric Power Co., Inc.). This report will cover the development work on thermal stability of materials, electrical fault test, insulation characteristics, cooling of model transformer, flow-induced static electrification, protection system and the prototype unit which is being built based upon these developments. View full abstract»

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  • Transmission Line Tower Analysis and Design in Review

    Publication Year: 1982 , Page(s): 4350 - 4357
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    This paper presents a review of the state of the art and practice of transmission line tower design with specific attention to structure loading conditions, comparison of results using different tower analysis techniques and a comnentary on some criteria of the ASCE Manual 52 "Guide Ebr Design of Steel Transmission Towers." View full abstract»

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  • High Field DC Conduction Current and Spectroscopy of Aged Transformer Oil

    Publication Year: 1982 , Page(s): 4358 - 4360
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    This paper studies the experimental results of the quasi-state high field dc conduction current, and changes occuring in the molecular structure of aged transformer oil, sampled from EHV transformer operating for the last five years. Aged oil was compared with fresh transformer oil and liquid paraffin. It was found that aged oil exhibits higher conduction than both of the other oils through 600 seconds of field application. However, no molecular changes were detected using different techniques of spectroscopy such as GC; UV; IR and NMR. Metallic impurities were found to be of the same order but the acidity increased manifolds to that of fresh oil. View full abstract»

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  • Investigation of Conductor Swinging by Wind and its Application for Design of Compact Transmission Line

    Publication Year: 1982 , Page(s): 4361 - 4369
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    In Japan it has recently become necessary to shorten the interphase spacing in overhead transmission lines because of land limitations and economical considerations. In this connection, the authors have attempted to analyse, in-depth, the possibilities of shortened interphase spacing via conductor swinging caused by wind effects: one of the important factors in the design of more compact overhead lines. View full abstract»

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  • Computer Simulation of the Initial Stages of the Lightning Protection Mechanism

    Publication Year: 1982 , Page(s): 4370 - 4377
    Cited by:  Papers (4)
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    This paper describes a computer program developed for the study of the growth of corona streamers from a lightning rod. The basic physical processes of electrical discharge are applied in the model. From results of computer studies, it was found that the determination of striking distance cannot rely solely on the state of growth of the upward streanier. The attractive effect of the lightning rod should be measured in terms of the rate of descent of the leader stroke with respect to the growth of the upward streamer. Additional studies were also made to determine the effect of structure height on striking distance. View full abstract»

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  • Heavy-Duty Insulator Assemblies for 500-kV Bulk Power Transmission Line with Large diameter Octagonal-Bundled Conductor

    Publication Year: 1982 , Page(s): 4378 - 4386
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    This paper describes the design prodedure and the results of field tests on mechanical performances of insulator assemblies newly developed to support octagonal-bundled conductors for 500-kV bulk power transmission. Taking account of conductor-motion-induced peak tensile load, fatigue, torsional torque and others, a successful design has been achieved in two prototype assemblies for such heavy mechanical duties as encountered during conductor galloping or swing. This has been proved throughout three years of the field tests. View full abstract»

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  • Test and Service Experience of BNC Impregnated Power Capacitors

    Publication Year: 1982 , Page(s): 4387 - 4391
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    Experience from various kinds of tests as well as from service of BNC impregnated power capacitors produced during a 4 year period is reviewed. 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