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Power Apparatus and Systems, IEEE Transactions on

Issue 1 • Date Jan. 1975

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Page(s): c1
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    Freely Available from IEEE
  • Eddy current losses due to alternating current strips

    Page(s): 1 - 9
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    A two dimensional solution for the vector potential and eddy current loss in a plurality of conducting regions due to a plurality of current sources is presented. The solution is applicable to those problems with boundaries which may be aligned with the coordinate surfaces of an orthogonal system of separable coordinates. The vector potential solution and current sources are represented by a series of eigenfunctions and the boundary conditions for the fields are applied such that numerical techniques can be used in solving for the coefficients of the series solution and then the eddy current losses. The method is applied to the problem of currents parallel to conducting plates in rectangular coordinates and the results are compared to those of previous investigations. View full abstract»

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  • Experimental evaluation of a high speed double sided linear induction motor

    Page(s): 10 - 17
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    Design details and performance testing of a high speed linear induction motor and test facility are described. The motor is double sided and of sector shape with radial slots. It has 4 poles, is 3 feet in length and is loaded by reaction with an 80 inch diameter rotating disc facility. Performance testing including efficiency, power factor, thrust, and normal force and moment are reported for operation over a speed range up to 300 MPH. A breakdown of losses, including end effects, and measurements of air gap flux density over the length of the motor are also reported. A description of instrumentation, the data Acquisition system and the load loop is given. The results are expected to be used to increase the understanding of LIM behavior and design and to provide a data base for the verification of new designs and new theoretical models. View full abstract»

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  • Equivalent two-phase representation of an n-m phase salient-pole machine

    Page(s): 18 - 26
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    This paper presents a generalized analysis for an n-m phase salient-pole electrical machine. The mathematical models of this machine are formulated in the symmetrical components, the two-phase, and the d-q reference frame. Regardless of the number of phases, it is found that the analysis of such a machine is remarkably simplified through its replacement by an equivalent two-phase commutator machine. The paper also presents a sound per-unit system suitable for the transformations used. In addition, the case of a 6- phase salient-pole synchronous generator is considered as a specific practical application of this generalized analysis. View full abstract»

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  • Common mode failure analysis

    Page(s): 27 - 30
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    Standard Reliability analysis techniques have demonstrated the capability to evaluate system vulnerability to random component failures. Recently, in the nuclear power industry, interest has been developing in methods to consider systematic, nonrandom, so-called "Common-mode" failures which are not tractable in quantitative terms using the usual fault tree or reliability block diagram approaches. This paper summarizes the state of the art as reliability engineers seek to extend the techniques to include multiple failures from a common cause (or in a common mode). Qualitative extensions of both the fault tree and the reliability block diagrams have been used to evaluate the adequacy of reactor protection circuitry for commercial power reactors. View full abstract»

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  • Sound power level determination for large steam turbine generators

    Page(s): 31 - 36
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    A technique is presented for calculating the approximate total sound power level (PWL) of large steam turbine-generators as well as the PWL of individual turbine-generator components. A near field approximation is used which is similar in structure to the new IEEE test code 85. Modifications are introduced in the test code procedure to reduce the effect of component flanking noise, and noise contributed by extraneous sources. The overall turbine room PWL is also calculated by a reverberant field technique and compared to PWL as calculated by free field methods. Measurements were made around ten large steam turbine generator units ranging in name plate rating from 390 to 1050 MVA. PWL's of turbine-generators were found to increase by approximately 3.5db for each doubling of unit rated MVA. PWL's calculated from indoor near field approximation show a 3 dbA increase over PWL's of outdoor units of equivalent rating. This difference is an indication of the need for further development of methods for determining sound power level. View full abstract»

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  • Field installation and test of an EHV current transducer

    Page(s): 37 - 44
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    Upon the successful development and laboratory testing of the EHV current transducer as described in a companion paper, the design was deemed satisfactory and ready for extensive field evaluation. This paper describes the installation, field testing, and performance evaluation of these transducers and a compatible low energy relaying scheme on the EHV power system of Commonwealth Edison Co. of Chicago. View full abstract»

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  • Flashovers of insulators under natural pollution and HVDC

    Page(s): 45 - 50
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    In the Dossenwald test station, near Mannheim, an insulator testfield for more than 30 test objects was constructed, fed by a stiff d.c. voltage source and controlled by an automatic test program installation. The tested types, 7 post insulators (porcelain) and 3 suspension insulators (porcelain, glass, silicone rubber), two specimen of each type in parallel, were continuously under 400 kV d.c. voltage, positive polarity, for more than 8000 h. Flashovers during that time were analysed. View full abstract»

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  • Staged fault and laboratory tests on a cable pair protection system designed to serve power stations

    Page(s): 51 - 57
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    Cable pairs entering power stations may be subjected to ground potential rise (GPR) and/or induction of several thousand volts during power system faults. A cable protection system designed to give a high degree of reliability is described, and the results of staged fault and laboratory tests are discussed. An analysis of neutralizing transformer transient performance shows how the transformer's behavior during fault conditions is determined by its volt-time capability. View full abstract»

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  • Guide for application of insulators to withstand swithching surges

    Page(s): 58 - 67
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    The switching surge strength of transmission line insulation is discussed. A guide to evaluate the importance of different variables influencing insulation strength and their impact on line insulation design is reviewed, and curves showing the line flashover rate for different insulation characteristics are presented. View full abstract»

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  • Concepts in system testing of dielectrics in capacitors

    Page(s): 68 - 71
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    This paper deals with system testing of dielectrics and their relation to power-factor-correction capacitors. The interaction of the various components in an electrical system are complex and extremely difficult to evaluate using ordinary analytical techniques. The major problems associated with analytical methods are overcome by using the systems approach. Evaluations which have been conducted with systems have yielded design information, processing data, and reliability characteristics which have previously been unobtainable even with large capacitors. View full abstract»

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  • Transverse edge effects of sheet guideways in magnetic levitation

    Page(s): 72 - 80
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    Calculations of electrodynamic forces of conducting sheet suspensions for preliminary design studies of magnetically levitated high speed guided ground transport have usually considered sheets of infinite width. Economic considerations necessitate a limited sheet width, and to the designer a knowledge of the effect of finite width on suspension forces becomes important. Edge effects of sheet guideways are studied here by boundary matching of the three-dimensional magnetic fields to the guideway current modes and to the current excitations in the flat rectangular superconducting coils. The double Fourier series approach is used. Theoretical predictions correlate with experimental measurements simulating the high speed limit of the suspension. Design guidelines are given. View full abstract»

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  • Experimental analysis of a fast acting circuit breaker mechanismߞElectrical aspects

    Page(s): 89 - 96
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    An experimental analysis of a fast electromagnetic circuit breaker driving mechanism has been performed. The device utilizes the repulsion force produced on a metal disc subjected to a transient magnetic field The spatial distribution, in the disc, of the driving field was determined using magnetic probes located at the surface of the disc or imbedded within. The acceleration of the disc was also measured using a piezo-electric aceelerometer. A pulsed power supply circuit with or without crow-bar energizes the magnet coil. The experimental results are found to agree very well with a more refined theoretical analysis presented in this paper. Some recommendations are made with regard to the optimization of both the geometry of the driving mechanism and the characteristics of the power supply used to energize this driving mechanism. View full abstract»

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  • The failure modes and effects analysis as a design tool for nuclear safety systems

    Page(s): 97 - 103
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    The activities of nuclear power plant designers are monitored by government and industry to an unprecendented degree. This involves not only rigid design and quality assurance criteria, but extensive documentation and reporting. The failure modes and effects analysis (FMEA) is a technique for checking designs and assuring quality. Included in the FMEA is a system of documentation. A simplified example of the reactor protective system (RPS) is used to illustrate the method. View full abstract»

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  • Fast calculation of gradients of a three-phase bundle conductor line with any number of subconductorsߞPart II: Gradients calculation for the side-phase

    Page(s): 104 - 107
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    A very fast method to calculate maximum gradients for the center-phase of a bundle-conductor line in flat arrangement has been given in a previous paper. The present contribution extends this method for the calculation of the maximum gradient of a side phase, again for bundles with any number of subconductors. View full abstract»

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  • Voltage-time characteristic of electrical breakdown in SF6

    Page(s): 108 - 115
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    V-t characteristic of impulse and switching surge breakdown in SF6is studied on various gaps. The characteristic is categorized into three patterns depending on the configuration of the gap and gas pressure. The properties of the V-t characteristic in these patterns are generalized as a semi-empirical formula which will be useful in the quantitative evaluation of the insulation coordination and the abnormal voltage protection of SF6gas insulated power equipments. The gap conditions in which those patterns of V-t characteristic are observed are also discussed in the Appendices. View full abstract»

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  • Methods for estimating transient performance of practical current transformers for relaying

    Page(s): 116 - 122
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    Since engineers learned, about 50 years ago, that a current transformer has real difficulty with an initially fully offset transient current, they have written many papers about the difficulty without finding a solution for most practical relay problems. This paper offers new data and methods which are intended to lead the relay engineer to solutions to many problems and to give him a better insight toward proper action in cases where there is still no simple solution. The emphasis is on practical problem solving. Some of the assumptions which are made can be defended on the basis that the solution, however much in error, errs on the safe side, and that the solution is a most valuable guide to the relay engineer. View full abstract»

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  • Liquid analogs of electrical machines

    Page(s): 123 - 127
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    General modeling criteria are presented for constructing liquid metal analogs for conducting paths in electrical machines. The use of mercury is specifically discussed as a convenient analog for solid copper and aluminum secondaries, and molten metal in electric furnaces. The construction of probes to measure flux and current density is presented, as are applications of the technique to bus bars, linear induction motors, and channel furnaces. View full abstract»

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  • Current-driven, corona-terminated water jets as sources of charged droplets and audible noise

    Page(s): 128 - 136
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    Single flow-rate-dependent sites of water emission and corona discharge are experimentally investigated with the dual objectives of furthering the understanding of audible noise generation from high-voltage transmission lines in foul weather, and engineering electrically-driven sources of charged droplets for use in particulate pollution control devices. Three distinct modes of behavior are mapped as functions of flow rate and potential gradient for ac and dc excitations of both polarities. Each is characterized in terms of physical appearance, current, visual corona, and nature of audible noise. Detailed treatment is given to the high-flow-rate, high-gradient mode which consists of an electrohydrodynamic jet terminated in a corona discharge followed by a spray of charged droplets. In terms of noise generated, this mode is efficient in removing water from a high-voltage transmission line. It appears also to be practical as a source of charged droplets. The salient features of this mode are given a basic explanation by using an experiment to control the potential distribution around the site in such a way that the electrohydrodynamics of the jet formation, as well as the electrical discharge, can be quantitatively described. For the first time, the corona discharge is identified as a trigger mechanism for breakup of a current-driven jet. Estimates are given of the drop size and charge, and the electrical power requirement for atomization from an array of sites. View full abstract»

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  • Top 20 electric power engineering graduate schools and the selection parameters

    Page(s): 137 - 160
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    This paper utilizes data from the PEEC 1971-72 Survey and other related information to demonstrate a feasible system of criteria for identifying schools which have developed substantial electric power engineering programs. Recommendations are made for refining and extending the concept to establish an official list of outstanding electric power engineering curricula. A proposal is also made that the Power Engineering Education Committee of the Power Engineering Society should establish a sub-committee to periodically name a limited number of schools which have developed outstanding power programs. View full abstract»

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  • The technical and economic feasibility of superconducting power transmission: A case study

    Page(s): 161 - 170
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    The long-range plans of the Long Island Lighting Company include the installation of 4600 MW of generation capacity at nuclear sites on eastern Long Island by the 1990's. A single site, Shoreham, was chosen for this study which would require transmission facilities to the Ruland Road substation, 43 miles away. Conventional 345 kV overhead and underground circuits are planned for this service. For the case study three superconducting cable schemes have been investigated which reflect various technical options. The superconducting cables have been designed to meet acceptable normal and contingency load flow conditions and to withstand maximum short circuit faults. A cost analysis has been made of the complete installation, providing a valuable comparison of the estimated cost of this new technology with conventional methods. The most favorable cost comparison is a two-circuit 345 kV superconducting system, which appears to be about one-half the cost of an all underground 345 kV high pressure oil-filled cable system. No reactive compensation will be required for the superconducting system, whereas extensive compensation is required for HPOF cables over the same distance. The cost estimate for the two-circuit superconducting system is about twice that of 345 kV overhead transmission, which would consist of two double circuits and one single circuit, assuming right-of-way could be obtained. View full abstract»

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  • [Back cover]

    Page(s): c4
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    Freely Available from IEEE

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