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Power Apparatus and Systems, IEEE Transactions on

Issue 11 • Date Nov. 1981

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

    Publication Year: 1981 , Page(s): c1 - 4698-d
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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
  • Formal Theoretical Foundation of Electrical Aging of Dielectrics

    Publication Year: 1981 , Page(s): 4333 - 4340
    Cited by:  Papers (12)
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    Based on the rate theory of chemical reactions, a quantitative mathematical model of electrical aging of dielectrics is established. The empirical aging law Vn t=C and associated Weibull failure distributions for a constant voltage test are demonstrated to be approximations of the exact formulas derived. The meaning of constants n and C is explained. New parameters controlling the rate of aging are identified and shown to be the material constants, independent of the test voltage or time. Generalization of the aging law for an arbitrary test voltage profile is outlined. The life characteristics, dielectric strength degradation curves and Weibull distributions for constant and linearly rising test voltages are described in detail. View full abstract»

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  • Computation of A.C.-D.C. System Disturbances - Part I. Interactive Coordination of Generator and Convertor Transient Models

    Publication Year: 1981 , Page(s): 4341 - 4348
    Cited by:  Papers (24)
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    In the presence of h.v.d.c. links the conventional quasi - steady state simulation of power system disturbances is not justifiable. This paper describes a realistic solution which combines the efficiency of single-phase multimachine transient stability analysis and the accuracy of detailed transient convertor simulation. Versatility and moderate computing requirements establish the proposed solution as a viable alternative to the use of analogue simulators. View full abstract»

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  • Computation of A.C.-D.C. System Disturbances. PT. II - Derivation of Power Frequency Variables from Convertor Transient Response

    Publication Year: 1981 , Page(s): 4349 - 4355
    Cited by:  Papers (1)
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    The aperiodic and distorted waveforms produced by h.v.d.c. convertors following system disturbances need to be processed in order to derive appropriate transient equivalents compatible with transient stability studies. This paper describes various techniques for the derivation of these equivalents and concludes that, while rms values provide realistic approximations for power, spectral analysis is required for the determination of voltage magnitudes. View full abstract»

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  • Computation of A.C.-D.C. System Disturbances. PT. III-Transient Stability Assessment

    Publication Year: 1981 , Page(s): 4356 - 4363
    Cited by:  Papers (2)
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    Quasi-steady state and transient convertor simulation models of h.v.d.c. transmission are compared in multimachine transient stability studies. The paper analyses their respective a.c. and d.c. system responses to typical disturbances, discusses the limitations and extent of applicability of the quasi-steady state model and justifies the need for temporary transient convertor simulation. It is concluded that after preliminary transient convertor simulation studies in a particular system, a suitably modified quasi- steady state model can be used in the assessment of transient stability. View full abstract»

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  • Performance Analysis of a Variable Source of Reactive Power on Distribution System Primary Feeders

    Publication Year: 1981 , Page(s): 4364 - 4372
    Cited by:  Papers (7)
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    An analysis of the performance of an idealized infinitely variable source of reactive power on distribution system primary feeders is presented. Necessary conditions for optimally siting, sizing, and operating the device are developed. Performance of the device is compared to performance of a fixed capacitor bank installation. Significant benefits realized are identified and illustrated with examples. Benefits include increased energy and peak power savings, improved feeder voltage characteristics and increased feeder capacity. A suboptimal strategy is presented and evaluated to illustrate one approach to realization of the device. View full abstract»

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  • Torsional Vibration and Fatigue of Turbine-Generator shafts

    Publication Year: 1981 , Page(s): 4373 - 4380
    Cited by:  Papers (18)
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    Transmission system events and operations which have the potential for removing significant fatigue life fram turbine-generator shafts are described. The factors which limit the fatigue capability of turbine-generator shaft systems are presented, along with a discussion of analytical models and their limitations for estimating the shaft fatigue duty following a defined electrical disturbance. The basis for a screening guide value for planned switching operations presented to the IEEE Working Group studying the effects of high speed switching is also discussed. View full abstract»

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  • Residental End Use Load Affected by Voltage Reduction

    Publication Year: 1981 , Page(s): 4381 - 4388
    Cited by:  Papers (1)
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    A voltage reduction program may produce reduced power and energy requirements on an electric system' but if the customer's end use application is considered, there may not be any net savings depending on ambient temperature and initial voltage. The energy savings to the utility will be utility specific and should vary from approximately I-nercent energy savings to an energy gain during extremely hot weather with high air conditioning saturation. View full abstract»

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  • A Simple and Efficient AC-DC Load-Flow Method for Multiterminal DC Systems

    Publication Year: 1981 , Page(s): 4389 - 4396
    Cited by:  Papers (11)
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    A new ac-dc Load-flow method for multiterminal dc-ac systems that uses a novel approach to solve the equations of the multiterminal dc system is described. A simplified version of the ac-dc load-flow method with all of the capabilities of estabLished Newton's methods is shown to have the best qualities of simultaneous and sequential solution ac-dc methods combined. Next, important features such as discrete taps, distinction between scheduled voltage and scheduled angle controls, fixed taps and extended phase controls, and current limits are incorporated to enhance the versatility of the method, especially for transient stability studies. Numerical examples are used to illustrate the various features of the method. Its performance is compared with those of an established Newton's method and a recent method. The method is simpLe to program, economical and fast. View full abstract»

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  • Alternating Sequential/Parallel Processing Fundamental and Examples

    Publication Year: 1981 , Page(s): 4397 - 4401
    Cited by:  Papers (5)
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    The advantages of parallel processing systems (pp's) are discussed, the mode of operation of Alternating Sequential/ Parallel Processors is explained and the time-reduction-ratio r which measures the effectiveness is defined. Matrix multiplication and a fault calculation procedure exemplify the use of the system and are in turn used to define low and high information-transfer methods. View full abstract»

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  • An Efficient Parallel Processing Method for Power System State Estimation

    Publication Year: 1981 , Page(s): 4402 - 4406
    Cited by:  Papers (11)
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    The reasons for using "Alternating Sequential/Parallel" ASP-systems, are their higher speed and availability. An algorithm for state estimation is developed based on conditions of "cutting" and "observability". It is then shown to have an extremely high speedup even if all degradation factors are included. Simulation results prove that the convergence of the algorithm is the same as that normally obtained. The same algorithm may be used in a "distributed network" of computers. View full abstract»

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  • Control and Monitoring System Communications for Effective Energy Use

    Publication Year: 1981 , Page(s): 4407 - 4412
    Cited by:  Papers (3)
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    The application of integrated, distributed systems techniques to energy management, while offering substantial benefits in terms of improved effectiveness of energy use, is too expensive for small commercial and residential buildings, because of the high cost of custom installation. This paper presents ways in which the use of standatdization and commonality of hardware and software can reduce costs. Layers of commonality are identified which, if adopted, would permit automatic interfacing of mechanical, electrical, topological, logical, software and human elements of "off-the-shelf" energy management components. A serial multi-drop data link, COMONET, is described which is specifically developed for control and monitoring tasks within buildings. View full abstract»

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  • Active-Synchronization Control System Used in DC Linear Motor

    Publication Year: 1981 , Page(s): 4413 - 4421
    Cited by:  Papers (1)
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    We developed recently a high speed DC linear motor which uses on-board normal-conducting DC electromagnets and air-core track coils to produce both thrust and lift. Subsequent research has been aimed at applying the linear motor to a new-type of railway system. Past of this research had been directed toward the train operation control system for the DC linear motor, and has resulted in the evolution of a new control system in which constant speed running and station stopping of trains are successfully achieved. View full abstract»

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  • Induction Watthour Meter Performance on Rectifier/Inverter Circuits

    Publication Year: 1981 , Page(s): 4422 - 4427
    Cited by:  Papers (17)
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    Experimental measurements of domestic induction watthour meter errors on single and three-phase rectifier and inverter systems are presented. The effect of bridge configuration as well as firing and overlap angles are reported. View full abstract»

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  • Dynamic Measurement of the Absolute Voltage Angle on Long Transmission Lines

    Publication Year: 1981 , Page(s): 4428 - 4434
    Cited by:  Papers (12)  |  Patents (1)
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    A new apparatus for dynamic measurement of the absolute voltage angle on long transmission lines is described. It is based on a method of synchronization by satellite and takes 30 measurements per second at three points of the Hydro-Québec network on a permanent basis. The system gives the local (or absolute) voltage phase angle (using a 60.00-Hz reference frame), the frequence at each point and the angle difference-between each pair of points. Automatic recordings of this data are made during disturbances. View full abstract»

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  • A Power Factor Standard Using Digital Waveform Generation

    Publication Year: 1981 , Page(s): 4435 - 4438
    Cited by:  Papers (3)
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    A measurement technique is described which uses the adjustable linear phase relationship between two digitally generated waveforms to establish power factor with an uncertainty of less than 50 ppm. Results of comparisons with thermal, electrodynamic and electronic wattmeters are summarized. View full abstract»

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  • A Linearization Method for Determining the Effect of Loads, Shunts and System Uncertainties on Line Protection with Distance Relays

    Publication Year: 1981 , Page(s): 4439 - 4447
    Cited by:  Papers (1)
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    Short circuit calculations usually performed for determining the setting of line protection relays neglect factors such as loads and shunts, and assume that all network parameters, such as line impedances, are known with perfect precision, which is not the case. This paper describes a technique for assessing the effect of these factors on the voltages and currents activating the relays. The study is centered on distance relays using the principle of impedance determination. View full abstract»

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  • Failure of Electromagnetic Voltage Transformer Due to Sustained Over-Voltage on Switching - an Indepth Field Investigation and Analytical Study

    Publication Year: 1981 , Page(s): 4448 - 4455
    Cited by:  Papers (6)
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    An electromagnetic voltage transformer (EMVT) was damaged when the 220KV bus bar was being de-energised by a circuit breaker fitted with grading capacitors across its contacts. This paper describes the field investigations and analyses the phenomenon using the principle of harmonic balance. It is established that the failure occurred due to fero-resonance between CB grading capacitors and non-linear EMVT inductance causing sustained over-voltage and consequently much higher than usual current. It could be a thermal or insulation failure or both. The analytical results obtained are shown to be similar to those determined by actual field. tests. View full abstract»

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  • Electric Power Engineering Education Resources - 1979-80

    Publication Year: 1981 , Page(s): 4456 - 4463
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    This sixth biennial (1,2,3,4,5,6) committee report compiles the results of a survey of Electric Power Engineering Education Resources at ECPD/ABET (Engineers Council for Professional Development/Accreditation Board for Engineering anid Technology) accredited universities in the United States of America for the academic year 1979-80. The report contains a list of faculty active during the subject year, their level of academic participation and professional experience. Statistics are presented showing student enrollments at the graduate level and technical course enrollments at the undergraduate and graduate 1 vels. Also included are data on degrees granted and research-funding. View full abstract»

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  • A Stochastic Model for PLC Systems

    Publication Year: 1981 , Page(s): 4464 - 4472
    Cited by:  Papers (3)
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    The designers of PLC (power line carrier) systems for distributiQn networks must contend with two sources of uncertainty. First, certain topological parameters, such as transformer locations, cannot be determined accurately. Second, certain other network parameters, such as loads, equipment characteristics and circuit configurations, vary with time. A previous paper [2] has shown that signal attenuations and error rates of PLC systems are very sensitive to these uncertainties. Therefore, it is critical that they be taken into account in the design process. We develop stochastic models to aid in doing this. Specifically, the models predict the statistics of signal attenuations and error rates in arbitrary PLC systems. This is done in two stages. First, a quadratic approximation to the network's propagation characteristics is developed. Second, this approximation and Monte Carlo sampling are used to obtain the requisite statistics. View full abstract»

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  • Effect of Partial Outage Representation on the Statistical Properties of Loss=of-Load Probability Estimates

    Publication Year: 1981 , Page(s): 4473 - 4478
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    Using a three-state Markov model to represent the available capacity of a generating unit, this paper examines the statistical properties of the Loss-of-Load Probability (LOLP) estimates of a system consisting of n such identical units. It is assumed that the units are observed for a total time of T units and the durations of each capacity state within this time-interval are recorded. The expected values and the upper confidence limits of the system LOLP are computed using (a) the full 3-state representation and (b) the corresponding equivalent forced outtage rate (EFOR) index. Numerical values are given to indicate that the expectation of LOLP using the EFOR model is larger than the corresponding value obtained from the three-state model. However, the difference between the expectations of the upper confidence limits for the two models is relatively smaller, and for high load values it actually changes sign. Thus this study suggests that depending on the details of the decision in view it may sometimes be preferable to pool the partial and full outage data (as in the EFOR model), rather than keep them distinct. View full abstract»

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  • Low Voltage Bulk Power System Restoration Simulation

    Publication Year: 1981 , Page(s): 4479 - 4484
    Cited by:  Papers (10)
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    Time is the crucial element in restorative state control for electric power systems. One method for reenergizing large portions of a blacked out electric power system with a minimum of switching and thus time to restoration, is described. Results of a simulated system restart utilizing actual power system facilities are compared to power flow studies. The simulation tests were performed on the Los Angeles Department of Water and Power (LADWP) system in order to verify the concept of utilizing generation operating at extremely low voltage to energize as large a part as possible of the unloaded bulk power transmission system located within the service area. View full abstract»

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  • Application of Fault Tree Analysis Technique to Predict Instrumentation System Failure and Define Problem Areas in a Nuclear Power Plant Containment Study

    Publication Year: 1981 , Page(s): 4485 - 4492
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    An application of the Fault Tree Analysis Technique to predict instrumentation and control system failure of a nuclear power plant containment isolation system is described in this paper. Because of the lack of a reliable data base, a qualitative failure assessment was made to define problem areas, determine the priority of failures of hardware, software and human interface units and their impact on the total system. This qualitative analysis may detect startling problem areas and may, also, reveal the effect of unit faults on specific systems not otherwise apparent. View full abstract»

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  • Design Considerations and Features for a Nuclear Power Plant Security System

    Publication Year: 1981 , Page(s): 4493 - 4501
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    Security has become a major consideration in the design and operation of nuclear power plants. This paper presents an approach to the design and installation of a plant security system in a nuclear power plant. It highlights the design considerations and features of the subsystems which comprise the total plant security system and the sequence of events from conception to final testing and acceptance of the system. 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