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Power Apparatus and Systems, IEEE Transactions on

Issue 4 • Date April 1983

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Displaying Results 1 - 25 of 36
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Publication Year: 1983 , Page(s): c1 - 1024-b
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1983 , Page(s): c2
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    Freely Available from IEEE
  • On The Exact, Carson and Image Theories for Wires at or Above the Earth's Interface

    Publication Year: 1983 , Page(s): 769 - 778
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3060 KB)  

    The relation between the exact theory and Carson's theory for the fields of straight wires above a homogeneous earth is derived. Sufficient conditions for the validity of Carson's equations are given. Cases for which Carson's theory is not valid are discussed. In addition, an image theory useful for magnetic induction problems is given and discussed. View full abstract»

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  • Transient Calculations on Crossbonded Cables

    Publication Year: 1983 , Page(s): 779 - 787
    Cited by:  Papers (9)
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    The present paper describes accurate and approximate methods of calculating transients on a crossbonded cable. Calculated results are compared with field test results, and the accuracy of the calculation, which has never been discussed in the previous publications, is proved. It is characteristic to a crossbonded cable that the sheath overvoltage is much greater than that on a noncrossbonded cable. This overvoltage is due to the reflection of a traveling-wave from the crossbonded points. The approximate method of a calculation shows satisfactory results with much smaller computation time in comparison with the accurate method if the number of crossbonding is large. View full abstract»

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  • Stabilizing an AC Link by Using Static Phase Shifters

    Publication Year: 1983 , Page(s): 788 - 796
    Cited by:  Papers (1)
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    The paper presents a Hybrid-computer simulation study of the damping effectiveness of static phase shifters. Control strategies based on tie line power and frequency deviations feedback and utilizing fast acting static phase shifters to modulate tie line power flow are effective in damping power and frequency excursions. Implementing static phase shifters as a stability-enhancement technique could improve dynamic stability, hence, increase tie line power capacity. View full abstract»

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  • A New Artificial Line For Testing High-Voltage Circuit Breakers

    Publication Year: 1983 , Page(s): 797 - 804
    Cited by:  Papers (1)
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    In a high-power laboratory, artificial lines are used for short-line fault testing on high-voltage circuit breakers. Over the years, several different configurations of artificial lines have been designed and used in testing laboratories. This article describes an artificial line for testing circuit breakers with current ratings up to 100 kArms. The artificial line combines constructional advantages with good practical results and has been successfully in use in KEMA's High-Power Laboratory since 1978. View full abstract»

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  • Performance of 115 kV Fiberglass Transmission Crossarms in Wet and Salt Fog Environments

    Publication Year: 1983 , Page(s): 805 - 811
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    This paper discusses 60 Hz-dielectric tests performed on 115 kV solid fiberglass transmission crossarm-insulator asserblies to evaluate their performance in wet and salt fog envirorents. Testing included the following variables: (1) wet and dry conditions, (2) new and used crossarms and insulators, (3) type and number of insulators, and (4) salt fog salinity. Analysis of test results shows that the surface coating of fiberglass insulation is susceptible to degradation in a salt fog enviroment. Once this coating is eroded and the glass fibers are exposed, carbonized tracking develops. The fiberglass crossarm thus loses its electrical strength. View full abstract»

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  • Use of Optical Cables in Power Transmission Lines

    Publication Year: 1983 , Page(s): 812 - 816
    Cited by:  Papers (1)
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    The design problems of an optical fiber cable suitable for installation in high power transmission lines are analyzed. Installation problems and repeater constraints are discussed and an experimental link to be installed in a 400 KV power line in México, as well as cable to be used are described. View full abstract»

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  • Calculation of Maximum Harmonic Currents and Voltages on Transmission Lines

    Publication Year: 1983 , Page(s): 817 - 821
    Cited by:  Papers (8)
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    This paper presents a method for calculating the location and magnitude of the maximum harmonic currents and voltages on a transmission line, given calculated or measured terminal values. This information is normally unavailable. However, as the number of harmonic sources on the system increases, the location and magnitude of these harmonic maximums will be of increasing importance. View full abstract»

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  • Switching Impulse Strength of Compacted Transmission Line Flat and Delta Configurations

    Publication Year: 1983 , Page(s): 822 - 831
    Cited by:  Papers (1)
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    Five transmission line phase configurations suitable for phase compaction were simulated and tested in a large portal testing tower to establish phase-to-phase and phase-to-tower switching surge insulation requirements for 765 kV systems. Using these results and other data available from the literature, clearances for 345, 500, and 1100 kV systems also were developed. View full abstract»

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  • A New Algorithm for Real-Time Optimal Dispatch of Active and Reactive Power Generation Retaining Nonlinearity

    Publication Year: 1983 , Page(s): 832 - 842
    Cited by:  Papers (2)
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    This paper presents a new method for optimal dispatch of real and reactive power generation which is based on cartesian coordinate formulation of economic dispatch problem and reclassification of state and control variables associated with generator buses. The voltage and power at these buses are classified as parametric and functional inequality constraints, and are handled by reduced gradient technique and penalty factor approach respectively. The advantage of this classification is the reduction in the size of the equality constraint model, leading to less storage requirement. The rectangular coordinate formulation results in an exact equality constraint model in which the coefficient matrix is real, sparse, diagonally dominant, smaller in size and need be computed and factorized once only in each gradient step. In addition, Lagragian multipliers are calculated using a new efficient procedure. A natural outcome of these features is the solution of the economic dispatch problem, faster than other methods available to date in the literature. Rapid and reliable convergence is an additional desirable characteristic of the method. Digital simulation results are presented on several IEEE test systems to illustrate the range of application of the method vis- à-vis the popular Dommel-Tinney (DT) procedure. It is found that the proposed method is more reliable, 3-4 times faster and requires 20-30 percent less storage compared to the DT algorithm, while being just as general. View full abstract»

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  • Experiences in the Internal Inspection and Maintenance Works on Gas Insulated Equipment in the Field

    Publication Year: 1983 , Page(s): 843 - 851
    Cited by:  Papers (2)
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    Data have been collected through the internal inspections and maintenance works on the gas insulated equipment working in the field. Wearing of contact of circuit breakers by repetitive interruptions of current is the determining factor for internal maintenance. Factors like the quality of sealings, conditions of absorbent, deteriorative influence of arc decomposition products etc. are not the factors that require internal inspections. Practical problems in the works inside the enclosure while the neighboring part of the substation is in operation are discussed basing on the experiences in the field. View full abstract»

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  • Transient Stability of Synchronous Generators with Two-Axis Slip Frequency Excitation

    Publication Year: 1983 , Page(s): 852 - 859
    Cited by:  Papers (5)
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    Investigations have indicated the possibility of operating two-axis synchronous generators (a machine which has two identical field windings: one on the d-axis and the other on the q-axis) asynchronously when the field windings are excited by slip frequency alternating currents. Such generators are free from the conventional steady-state stability limitations of the conventional synchronous machines and retain the advantage of reactive power control. View full abstract»

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  • Effects of Internal Conductor to Enclosure Arcs on SF6 Gas Insulated Transmission Lines

    Publication Year: 1983 , Page(s): 860 - 869
    Cited by:  Papers (5)
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    The effects of internal conductor to enclosure arcs on SF6 gas insulated transmission lines (GIL) were tested using 154 kV and 275 kV cables. Tests were conducted on the 154 kV cable with arc currents of 1 KA RMS and 2 KA RMS for durations of 1 ~ 4 seconds, and on the 275 kV cable with an arc current of 50 KA RMS for durations of 0.1 ~ 0.4 seconds. Various characteristics of these cables were measured, such as the velocity of arc travel, melting trends of the enclosure wall, the decomposition of SF6 gas, the pressure and temperature curves, damage to cable components, and the residual performance capability of damaged components. The data, from these measurements, the findings of these tests, contribute to the improved design and maintenance of GIL systems. View full abstract»

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  • A Method of Supressing Fault Currents and Improving the Ground level Electric Field in a Novel Six-Phase Power Transmission system

    Publication Year: 1983 , Page(s): 870 - 880
    Cited by:  Papers (1)
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    In this paper, it is shown that the maxnuma electric field under the six-phase line with a modified phase arrangement becomes as low as that under the three-phase double-circuit ( conventional ) line. Then, a method is proposed for limiting line-to-ground fault currents and short-circuit currents without causing the fall in unfaulted phase voltages in the six- phase system with its neutrals solidly grounded. The fault analysis and the experimental result demanstrate that for a single line-to-ground fault at the sending end, the fault current in the proposed system is half that in the conventional system. As for the three-phase short-circuit fault at the sending end, the fault current in the proposed system is about 60% of that in the conventional system. It is concluded that the proposed six-phase system is superior in the system transient stability to the conventional system. View full abstract»

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  • Indentification and Ranking of Critical Contingencies in Dependent Variable Space

    Publication Year: 1983 , Page(s): 881 - 892
    Cited by:  Papers (10)
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    Working in dependent-variable space, reliable yet simple computational procedures are presented for the purpose of identifying and ranking line outages which result in the violation of various limits related to power system security. Security limits defined in terms of real-power line flows, generator reactive powers and demand-bus voltage magnitudes are considered in normalised subspaces wherein critical contingencies are identified by a filtering algorithm using the infinite norm as a performance index. Critical contingencies are then ranked using performance indices which are defined in accordance with the subspace of interest. In the case of real-power line flows, ranking is based on a measure related to distance from the center of the corresponding security region whereas, in the case of generator reactive powers and demand-bus voltage magnitudes, ranking is based on measures related to distances from the boundaries of the corresponding regions. Furthermore, an operating point's violation of limits associated with generator reactive powers and demand-bus voltage magnitudes is measured in combined form form with due consideration being given to the relationships between these reactive powers and voltage magnitudes. View full abstract»

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  • Forecasting Distribution system Loads Using Curve Shape Clustering

    Publication Year: 1983 , Page(s): 893 - 901
    Cited by:  Papers (5)
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    Trending using curve fitting to past small area load growth is an economical but not highly accurate method of forecasting loads for distribution planning. A new trending method uses clustering of historical load at the small area level as the forecast algorithm. This new method has significant performance advantages over normal curve fit methods and can be implemented in 16 bit integer arithmetic on most computers. The method and test results are discussed in detail. View full abstract»

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  • Implementation of a Computer Model to Include the Effects of Corona in Transient Overvoltage Calculations

    Publication Year: 1983 , Page(s): 902 - 910
    Cited by:  Papers (6)
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    By means of a previously developed model, the effects of corona on transient overvoltage calculations are presented. The development of a suitable current source model for insertion at critical points along the line and the effects of corona as predicted by the model on 3 phase lines are also demonstrated. Comparison is made with energization studies on EHV lines. View full abstract»

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  • Influence of Humidity on Variation of Ion Mobility with Life Time in Atmospheric Air

    Publication Year: 1983 , Page(s): 911 - 917
    Cited by:  Papers (4)
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    Using the time of flight method, the variations of ion mobility with both life time and atmospheric humidity were measured. At higher absolute humidity, mobility of the positive ion starts to decrease and saturate at a certain value in a shorter life time. Meanwhile, mobility of the negative ion is independent of life time and the value of it decreases as absolute humidity increases. Applying the experimental data to the coaxial cylinders in corona, the distributions of effective field and space charge density were calculated in different absolute humidity. View full abstract»

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  • Revolving-Field Analysis of a Shaded-Pole Motor

    Publication Year: 1983 , Page(s): 918 - 927
    Cited by:  Papers (1)
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    The revolving-field theory as applied to singlephase induction motors is extended to develop a concise, yet comprehensive, theory for shaded-pole motors with single shading coil. The analysis can, however, be easily extended for motors with multiple shading coils. The novel features of this development are that it provides means to properly account for the magnetic saturation, space harmonics and the core loss. The analysis is based upon the concept that a winding can be simulated by a pair of mutually perpendicular windings. Based upon this concept and the revolving-field theory, an equivalent circuit for a shaded-pole motor is proposed. Performance equations are then presented and a step by step procedure is outlined to effectively utilize these equations. The accuracy of the development was confirmed by actual measurements on shaded pole motors with various horsepower ratings. To show that the present development yields better correlation, comparisons between actual test results and computed data using the present model, as well as other existing models are also given. View full abstract»

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  • Development of a Collector Ring Monitor for Sparking Detection on Generators

    Publication Year: 1983 , Page(s): 928 - 933
    Cited by:  Patents (3)
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    Continuous monitoring techniques are described for sparking detection of collector rings on generators. View full abstract»

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  • Measurement Ion Current Density at Ground Level in the Vicinity of High Voltage DC Transmission Lines

    Publication Year: 1983 , Page(s): 934 - 941
    Cited by:  Papers (8)
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    Sensors for measuring vertical current density at ground level near high voltage dc (HVDC) transmission lines are subject to error when the sensor is not in the ground plane. The magnitude of this error, for guarded and unguarded sensors, has been investigated using hoth dc electric fields with space charge and ac electric fields in a parallel plate facility. For conditions like those expected under HVDC transmission lines, the results obtained using ac and dc methods agreed to within experimental uncertainty. The measuired errors are as large as 25 percent for guarded sensors and significantly larger for unguarded sensors. Data for various sensor elevations and guarding are presented in graphs to aid the designer. Comparisons with results from an IEEE Working Group field day are also presented. View full abstract»

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  • Some Studies on Carrier Propagation in Overhead Transmission Lines

    Publication Year: 1983 , Page(s): 942 - 948
    Cited by:  Papers (1)
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    The effectiveness of a carrier channel on a power line under various power frequency load conditions is studied. The effect of increase of load current results in an increase of conductor temperature, line length and sag. Therefore, the resistivity of the ACSR conductor material increases and the effective height of the conductor above the earth level decreases. A mathematical model of series-impedance and shunt-admittance which takes into account the above effects is used to evaluate the carrier signal attenuation on a line. Further, for the case of a bundle conductor line, the effect of subconductor deflections on the carrier attenuation has been studied. The effects of earth resistivity and earth wires on the actual carrier attenuation have also been studied. View full abstract»

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  • Natural Frequencies and Vibration Behaviour of Motor Stators

    Publication Year: 1983 , Page(s): 949 - 956
    Cited by:  Papers (13)
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    In order to reduce electromagnetic acoustic noise in motors, it is essential to understand the vibration behaviour of the stators so as to prevent resonance between the electromagnetic forces and the stators. This paper presents an assessment of the effects of teeth, windings, impregnation and wedges on the natural frequencies and vibration response of stators on the basis of experiments and simulation through numerical computation of the natural frequencies and vibration response of ring- and segmented-core stators having totally impregnated formed coils. The results show that assessment of the Young's modulus of the insulating layers of the impregnated windings and the wedges is the most important, and that the insulating layers of the windings can be reasonably dealt with as having a value of about 30% of the converged equivalent Young's modulus, and the wedges as having a value of 100% of that of their material. View full abstract»

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  • An On-Line Microprocessor Based Transformer Analysis System to Improve the Availability and Utilization Of Power Transformers

    Publication Year: 1983 , Page(s): 957 - 962
    Cited by:  Papers (7)
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    Power transformer availability and utilization are key factors in overall transmission system availability and utilization. A Microprocessor based Transformer Analysis System (MTAS) has been conceptually configured to provide improved power transformer availability and utilization through the continuous monitoring and analysis of power transformer operating parameters. Present power transformer monitoring and protection schemes are based on single inputs which do not adequately encompass the power transformer in its operating environment. Decisions about the operating condition and capability of power transformers, which are now being made from single parameters measured as needed by the decision makers, can be formulated by the MTAS from multiple diagnostic inputs and a historic data base. 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