By Topic

Power Apparatus and Systems, IEEE Transactions on

Issue 6 • Date Nov. 1978

Filter Results

Displaying Results 1 - 25 of 56
  • IEEE Transactions on Power Apparatus and Systems - Table of contents

    Page(s): c1 - 36b
    Save to Project icon | Request Permissions | PDF file iconPDF (930 KB)  
    Freely Available from IEEE
  • IEEE Power Engineering Society

    Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (196 KB)  
    Freely Available from IEEE
  • Publications of Interest

    Page(s): 1981 - 1982
    Save to Project icon | Request Permissions | PDF file iconPDF (277 KB)  
    Freely Available from IEEE
  • Load Flow Convergence in the Vicinity of a Voltage Stability Limit

    Page(s): 1983 - 1993
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2289 KB)  

    Because load flow problems are expressed as sets of nonlinear simultaneous equations, they have no unique solutions. In this paper a region where a set of initial values converges to a stable load flow solution under specified conditions, is investigated theoretically when the Newton-Raphson method is applied to a set of nodal power equations expressed in either polar or rectangular coordinates. The results are tested in load flow calculations on a 28-node power system and the convergence characteristics for the two types of coordinates are compared. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Secure Allocation of Reguiating Reserve in the Presence of Bus-Demand Uncertainty

    Page(s): 1994 - 2004
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2797 KB)  

    A method is presented for allocating regulating responsibility among designated generators to ensure a secure dispatch to the broadest variations in bus demands. Such allocation is specified through the assignment of participation factors that govern the fraction of the net change in total system demand that each generator will supply. Optimal participation factors, as defined in this paper, are those which guide generation change, from specified base points, to supply the widest possible variations in bus demands, about specified best estimates, within the thermal limits of the transmission network intact and subsequent to any postulated utage contingency. The problem is formulated in terms of the dc model and solved using linear programming. The breadth of securely-supplied demand variations may be compared with anticipated possible variations to assess the adequacy of reserve margins established by the specified base points. If reserve margins are inadequate, the simplex variables, offered as a by-product of solution, guide the necessary adjustment of the base points. The computational algorithm presented has the potential for application to on-line dispatch. The effectiveness of the algorithm is demonstrated through two numerical examples. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Estimated Life Expenditure of Turbine-Generator Shafts at Network Faults and Risk for Subsynchronous Resonance in the Swedish 400 kV System

    Page(s): 2005 - 2018
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3394 KB)  

    Recent concern over abnormal stresses imposed on the shafts of large turbine-generators, due to network faults and SSR, has led to intensive investigations in Sweden. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Low-Loss 765 KV Pipe-Type Power Cable

    Page(s): 2019 - 2030
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5700 KB)  

    A 765 kV Low-Loss Pipe-Type AC Transmission Cable with oil-impregnated laminar insulation of cellulose paper and poly-propylene film has been developed. The development of the prototype sample (using specially treated conventional oil), bending tests and EHV tests on one specimen are described. Test results indicate the integrity and reliability of this design. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Penalty Factors From Newton's Method

    Page(s): 2031 - 2040
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2456 KB)  

    The penalty factors calculated by the classical B-coefficients method are shown to be proportional (but not equal) to the penalty factors calculated directly from the transposed acobian. It is also shown that the economic operating point is independent of the load and generation distribution factors Z. Expected computational times in examples with up to 5873 buses and 943 generators are given. The evidence presented supports conclusions also reached by others indicating that the transposed Jacobian approach is superior to classical B-coefficients based on its computational speed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Partial Discharge Location in Transformers and Reactors by Waveshape Recognition

    Page(s): 2041 - 2044
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1720 KB)  

    A technique for the location of partial discharges in transformers and reactors is described. The unique nature of the terminal voltage waveform resulting from a discharge occurring at a particular position along the winding is exploited to give the required location information. This waverorm is compared with waveform sets obtained by calibration, using cross-correlation techniques. The results of preliminary experiments are presented and areas of further development are outlined. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Development of ±400 KV/±High and Medium-Pressure Oil-Filled Paper Insulated DC Power Cable System

    Page(s): 2045 - 2056
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2502 KB)  

    This paper describes the steps to be taken to optimize the design of oil-paper insulated power cable for high voltage dc operation. Experimental data is presented on models to establish the steady-state dc dielectric strength and the switching surge polarity reversal dielectric strength of oil-paper insulations. Laboratory data is presented on factory made prototype cables tested under voltage stress conditions applicable to a ±600 kV dc system. Optimized designs of high-pressure oil-filled pipe-type and medium-pressure oil-filled self-contained cables are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Simulator Study of Multiiterminal HVDC System Performance

    Page(s): 2057 - 2066
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7691 KB)  

    Extensive and detailed HVDC simulator investigations have been carried out to demonstrate the operating performance of 3-and 4-terminal HVDC systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Method for Estimating Equivalent Forced Outage Rates of Multistate Peaking Units

    Page(s): 2067 - 2075
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1888 KB)  

    This paper proposes and illustrates a method for calculating the equivalent forced outage rate of multi-state peaking generating units. The proposed method considers partial- outages which were not specifically included in the methods proposed previously. Two approaches proaches are described and illustrated: one requires developing and solving a multi-state model using component failure and repair rates; the other which is an empirical approach requires quires additional data on start times and stop times of the units to define the demand period. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reliability Evaluation in Energy Limited Generating Capacity Studies

    Page(s): 2076 - 2085
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2639 KB)  

    Most generating capacity reliability studies assume that there are no inherent energy imitations and therefore concentrate on considering the effect of unit forced outages and uncertain load requirements. It appears, however, that the era of abundant energy is disappearing and that limitations must be included in conventional studies. This paper illustrates an extension of a well known technique for generating capacity evaluation which includes limited energy systems. The approach is illustrated by a simple numerical system example. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Air Humidity: An Important Factor for UHV Design

    Page(s): 2086 - 2093
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1980 KB)  

    The switching-surge performance of long air gaps has been studied with regard to humidity. It has been found that humidity affects the flashover characteristics more than what could be expected from the present knowledge for large gap spacings . Based on physical observations of the discharge development, it has been shown that the position of the minimum of the U-curve changes: the minimum flashover voltage increases while the critical time-to-crest decreases with humidity. This results in important consequences for UHV insulation design. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • UHV Disconnectors: Switching Surge Design and Testing of External Insulation

    Page(s): 2094 - 2103
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3474 KB)  

    The switching surge insulation characteristics of a disconnector (formerly "switch") are presented in a generalized form, based on a series of tests performed on UHV disconnectors with various heights H and clearances between contacts D. The knowledge of these characteristics and of the distribution of the expected overvoltages in service allows to determine the total risk of discharge RT and the risk of discharge across the longitudinal insulation RL. A general method for the design of a disconnector that meets prescribed maximum tolerable risks is presented. The statistical significance of a type test is then investigated, and the procedures recommended by IEC and IEEE are criticized. Some changes in the testing procedure are finally proposed, in order to ameliorate the tests and to reduce the differences between their requirements on the design of a disconnector. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ultra High Speed Relay for EHV/UHV Transmission Lines -- Development, Design and Application

    Page(s): 2104 - 2116
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3884 KB)  

    A new protective relay that solves many of the problems associated with the protection of EHV and future UHV systems is described. Based on a traveling wave approach the relay system operates at ultra high speed and can detect and determine the direction to a fault in a few milliseconds. The relay operating principle, design and application are presented as well as results from computer simulation studies and laboratory tests. The first relay system was installed in the USA in Bonneville Power Administration's 500 kV system and represents a substantial contribution to present efforts to shorten fault clearing times as a method to improve system stability and power transfer capability. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Development and Application of a New Semiconductive-Glaze Insulator

    Page(s): 2117 - 2126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6693 KB)  

    The development and application of a new bell-shaped porcelain suspension insulator with a semiconductive-glaze is described. The new design developed jointly by Ontario Hydro and the Canadian Porcelain Company, provides a significant improvement in insulation strength over conventional porcelain insulators under wet and contaminated conditions. The higher insulation strength facilitates line compaction, reduces contamination problems on existing lines, and allows novel applications including line conversions to higher voltages and increased current loadings. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Selection of Standard Sizes for Metallic Electrical Conductors for Insulated Wires and Cables

    Page(s): 2127 - 2133
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2264 KB)  

    This paper discusses factors which should be considered in developing standard sizes for metallic electrical conductors to be used in insulated wires and cables. Standards for solid and stranded conductors in both the United States and International systems are analyzed and compared. In response to a growing interest in the forthcoming metrication of the U.S., guidelines for a rational and distinctive approach to standardizing metric-dimensioned conductors are offered. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Hydraulic Unit Dynamic Performance Under Normal and Islanding Conditions -- Analysis and Validation

    Page(s): 2134 - 2143
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2652 KB)  

    Experience obtained at Ontario Hydro with the operation of hydraulic units under islanding conditions has demonstrated that the speed control parameters of the unit governors are critical. The requirements for good stability of speed control under islanding conditions or other isolated modes of operation can be in direct conflict with the parameter settings required for fast plant response under synchronous operation on the interconnected network of which Ontario Hydro forms a part. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transformer Diagnostic Testing by Frequuency Response Analysis

    Page(s): 2144 - 2153
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4908 KB)  

    Winding deformation in power transformers can be measured externally using a new frequency response analysis (FRA) method Field experience since 1975, on five separate transformers up to 550 MVA rating, 230kVclassindicatesthatthismethod hasadvantagesover the low voltage impulse (LVI) method as a practical maintenance tool. Results on suspect transformers indicate that benchmark reference data is not always necessary to identify certain kinds of mechanical damage. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integer Programming Approach to the Problem of Optimal Unit Commitment with Probabilistic Reserve Determination

    Page(s): 2154 - 2166
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3173 KB)  

    A method for determining the unit commitment schedule for hydro-thermal systems using extensions and modifications of the Branch and Bound method for Inteler Programming has been developed. Significant features of the method include its computational practicability for realistic systems and proper representation of reserves associated with different risk levels. Contracts relating to power interchange have also been adequately modelled for such an approach. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of the Proximity Effects in Electric Field Measurements

    Page(s): 2167 - 2177
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2880 KB)  

    Measurement techniques of the electrostatic field in an EHV environment have been considerably discussed in recent years. Most of the observations were based on experimental findings since little analytical work has been done. In this paper we present a theoretical analysis of the proximity effects on meter performance due to the operator's body. It is shown that the local field enhancement or reduction could result in appreciable errors in the measurements. Theoretical interpretations and numerical results associated with a variety of measurement techniques are described. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Premolded Splice for 138KV Extruded Dielectric Cable

    Page(s): 2178 - 2186
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2745 KB)  

    A premolded splice for 138kV extruded dielectric cable was developed in a project sponsored by EPRI and ERDA. The splices offer significant advantages in ease of assembly and in reliability as a result of pretesting at the factory. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Booster Shed: Prevention of Flashover of Polluted Substation Insulators in Heavy Wetting

    Page(s): 2187 - 2197
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3981 KB)  

    Flashovers have occurred in Europe on quite lightly polluted insulators, both under heavy rain and during the operation of live-washing systems. To avoid such flashovers a new device, the booster shed, has been developed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bundled-Conduuctors for EHV Transmission Systems with Compressed -- SF6 Insulation

    Page(s): 2198 - 2206
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3437 KB)  

    This report presents the results of a theoretical study to evaluate the practicability of bundled conductors in SF6-insulated transmission systems operating at EHV levels. The bundled conductors are evaluated according to their ability to maintain the electric-field intensity at the conductor surface below the corona-on-(or breakdown) level of the conductor, and are compared with practical coaxial-conductor systems. The results obtained show that the concept of bundled conductors can be adapted for use in SF6-insulated systems. The proposed bundle configuration consists of a central conductor surrounded by n small subconductors forming an electrostatically protective screen, the conductor bundle itself enclosed within an outer envelope. Compared with conventional coaxial configurations, it presents several advantages, namely, flexibility of design to meet the system's high-current, mechanical and insulation requirements separately, smaller electrode area exposed to high field intensities, and less stringent specifications for the supporting epoxy spacers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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