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Power Delivery, IEEE Transactions on

Issue 4 • Date Oct. 1986

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Displaying Results 1 - 25 of 41
  • Table of contents

    Publication Year: 1986 , Page(s): c1 - 290d
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    Freely Available from IEEE
  • IEEE Power Engineering Society

    Publication Year: 1986 , Page(s): c2
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    Freely Available from IEEE
  • Update on the Development of Reduced Wall 138kV HPOF Cables and Joints for Re-Conductoring of Existing 69kV Lines on the Florida Power & Light Company System

    Publication Year: 1986 , Page(s): 1 - 8
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    A reduced wall 138kV HPOF pipe-type cable having a 700 kcmil (355 mm2) compact round copper conductor and 348 mils (8.8 mm) of insulation and two types of joints have been developed for re-conductoring existing 69kV HPOF feeders utilizing 5 inch (127 mm) outside diameter pipes on the Florida Power & Light Company (FP& L) system. Laboratory test results on the cable and two joints, one employing hard paper and the other high density crepe paper tapes, are reported. The commercial cable installation is described. Test results are also given on an improved design reduced wall 138kV HPOF pipe-type cable having a 2000 kcmil (1015 mm2) compact segmental copper conductor and 379 mils (9.6 mm) of insulation and a high density crepe paper joint intended for re-conductoring a 69kV HPOF pipe-type feeder using the existing 6-5/8 inch (168 mm) outside diameter pipes. The cable and joint satisfactorily passed all requirements of AEIC CS2-82 (4th Edition) [4]. View full abstract»

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  • Analysis of Ground Fault Curreni Distribuiion along Underground Cables

    Publication Year: 1986 , Page(s): 9 - 18
    Cited by:  Papers (5)
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    It is important to determine the segment-by-segment distribution of the fault current in a multigrounded power network for better power system operation and grounding structure design. In this paper, a new method for the analysis of ground fault current distribution along underground cables (and/or overhead lines) is presented. The method is sufficiently accurate and comprehensive to simultaneously consider all the significant variables. The equivalent circuit developed utilizes both lumped and distributed parameters. The method is based on the successive computation of driving point impedance matrices at each grounding structure location. Simulations have been done on a computer. Verification studies and various parametric studies have been performed. View full abstract»

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  • A Microprocessor Based Measuring Instrument for Rapid Testing of Transformer Core Material

    Publication Year: 1986 , Page(s): 19 - 22
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    Precise knowledge of the characteristics of core material Is essential for the design of electromagnetic devices I Ike dynamos, I nstrument transformers and relays. Conventional measurement of the core characteristics Is a tedious process as it Involves collection of voluminous data and corrections thereto. An instrument using linear compensating networks and exploiting the processing capabilities of the popular microprocessor is developed for the measurement of core characteristics such as specific iron loss and the dynamic B-H curve. The necessary corrections are Incorporated In the software so that the end result can be straightaway used in design. View full abstract»

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  • Design of a System for Automated Measurement and Statistics Calculation of Voltage and Current Harmonics

    Publication Year: 1986 , Page(s): 23 - 30
    Cited by:  Papers (5)
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    The design and operation of a portable, personal computer-based system for the measurement and processing of data on 60 Hz. and harmonic current and voltage amplitudes and phases, and for the production of statistics and time trends on those quantities is described. Over the data acquisition interval, which may be several days in length, the system calculates and stores for each selected harmonic frequency of each selected voltage or current channel, statistics chosen from among: Mean, Mean Square Value, Variance, Maximum, Minimum. Trends in composite quantities such as Telephone Influence Factor and Total Harmonic Distortion may also be calculated over the interval. Samples of the graphical presentation of statistical results are included. View full abstract»

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  • The Concept of Figure of Merit Applied to Protection System Coordination

    Publication Year: 1986 , Page(s): 31 - 40
    Cited by:  Papers (5)
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    Clearly there is a need for further development and discussion of the Figure of Merit concept. This paper has presented three alternative Figures of Merit with numerical examples for a sample power system. The need for these measuring parameters is certainly clear to anyone who has performed a system-wide protection analysis using a digital computer program. The FOMs provide a means of comparison between alternative protective system designs just a system losses provide a means of comparison between different operating strategies. There is little doubt that the definitions of the Figures of Merit presented here will change or be replaced as practical experience is gained in their application. It is the author's intent that this paper will provoke serious consideration of an area requiring further study. View full abstract»

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  • Design Principles of a New Generator Stator Ground Relay for 100% Coverage of the Stator Winding

    Publication Year: 1986 , Page(s): 41 - 51
    Cited by:  Papers (5)
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    The design principles of a new relay for detection of grounds on the stator windings of generators is discussed. The relay provides 100% coverage of the stator windings with measurement of the fundamental and third harmonic components of the residual voltage at the terminals of the generator and the voltage across the grounding resistor at the neutral of the generator. The design concepts of the detectors utilizing the third harmonic components of the above signals are based on measurements of these signals on a number of Ontario Hydro thermal units. View full abstract»

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  • Ultra - High - Speed Relaying Protection: Asetting Methodology

    Publication Year: 1986 , Page(s): 52 - 59
    Cited by:  Papers (1)
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    An in - death analysis of fundamental Parameters Pertaining to Ultra-High-Speed Relay (UHSR) settings is carried out. The performance of the Independent Directional Detector (DD1) unit is analyzed in terms of the setting application values of current and voltage for a variety of faults and systems conditions. Relative underreach curves are presentes to show the influence of fault type and resistance on the unit detection range for a given setting. The paper describes a setting approach, based on the above analysis, as actually implemented in a 500 KV double circuit line, with a fuller utilization of the independent mode. View full abstract»

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  • Planning and Protection Implications of Reduced Fault-Withstand Time of Power Transformers

    Publication Year: 1986 , Page(s): 60 - 67
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    The recent revisions (1980-1983) to the standards for power transformers in both the U.S.A. and Canada call for corresponding revisions in many related planning and protection practices. Particularly, it is found that the reduction to 2 seconds for maximum through faults on transformers and the necessity to include a value for system impedance in the specification of the larger transformers will have significant effects on previous practices for planning, protection, operations, loading and specification. This paper discusses a number of these effects, with an emphasis from a protection point of view. View full abstract»

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  • Time Delay Compensation for High Speed Digital Protection

    Publication Year: 1986 , Page(s): 68 - 73
    Cited by:  Papers (4)  |  Patents (1)
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    Processing of the fault transients for eliminating the unwanted signals, is essential. for the EHV system protection. The various components which perform this function, and the filters in particular, introduce a significant delay in the operation of the protective devices. The paper investigates the various sources of time delay, and presents a digital. time delay compensation scheme, together with some test results. View full abstract»

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  • Design and Testing of a Multi-Microprocessor Travelling Wave Relay

    Publication Year: 1986 , Page(s): 74 - 82
    Cited by:  Papers (4)
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    This paper describes the design and testing of a digital ultra high speed (UHS) travelling wave based protective relay. It shows how a prototype has been realized by a simple and fairly low cost (a few hundred dollars for parts) dedicated multi-microprocessor system. The paper presents also the results of the tests carried out on the prototype by using a microprocessor based complex waveform signal generator (CWSG) which displays the output of a mainframe computer-based electromagnetic transients program (EMTP) in real time. The relay showed good practical behaviour, especially with regard to the UHS feature and faulted phase selection and fault classification capability. View full abstract»

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  • An Expert System for Fault Section Estimation Using Information from Protective Relays and Circuit Breakers

    Publication Year: 1986 , Page(s): 83 - 90
    Cited by:  Papers (85)  |  Patents (3)
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    This paper deals with an expert system which can estimate possible fault sections using information from protective relays and circuit breakers. This system is applicable to dispatching centers and can help dispatchers to judge emergency situations as the first step in restoration procedures. When some faults occur, the system makes inferences based on both knowledge about protection systems and information on the operating protective relays and tripped circuit breakers. The system can give possible answers even in the case of multiple faults and false operations of relays and circuit breakers. This expert system is written in Prolog. View full abstract»

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  • Field Experience with the AEP Digital Relay

    Publication Year: 1986 , Page(s): 91 - 98
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    This paper will briefly review the installation of the Symmetrical Component Distance Relay (SCDR) in AEP's Matt Funk substation and discuss our field experience. Data on system performance will be presented. Special emphasis will be placed on electromagnetic susceptibility problems encountered in the field and corroborating data obtained from AEP laboratory EMI testing. Problems were encountered with the original formulation of the impedance algorithm as presented in previous papers. When dealing with the calculation of ground distance on lines with infeed, the algorithm misclassified fault types. This problem and the latest evolution of our impedance calculation formula will be discussed. View full abstract»

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  • Microprocessor-Based Stabilizing Control Equipment for Survival of Isolated Mid-City Power System

    Publication Year: 1986 , Page(s): 99 - 104
    Cited by:  Papers (2)
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    This paper describes the recently developed microprocessor-based stabilizing control equipment for survival of isolated mid-city power system having heavy load and large shunt capacitance (Underground cables) of TOKYO ELECTRIC POWER COMPANY (TEPCO). The active power balance and voltage stabilizing control scheme is realized by high-speed control of the 66KV load feeders, shunt reactors, shunt capacitors and 275KV & 154KV underground transmission cables dispersed in the power system. View full abstract»

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  • Electromagnetic Fields Generated by Overhead and Buried Short Conductors Part 1 - Single Conductor

    Publication Year: 1986 , Page(s): 105 - 111
    Cited by:  Papers (25)
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    The fundamental concepts and analytical development related to the low frequency electromagnetic fields generated by a single current-carrying conductor immersed in a medium of infinite extent and in a conducting half-space are described and discussed. It is shown that vertical conductors buried in earth are not detectable by above earth surface measurements of magnetic fields. Examples and numerical results involvinq energization of typical intact and broken single conductors are then described and commented on. It is shown that earth surface potentials and above earth magnetic fields are significantly distorted by a break in horizontal and oblique conductors. Finally, experimental measurements on a model with considerable heterogeneities confirm the significant influence of conductor discontinuities on the potential and magnetic field profiles. View full abstract»

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  • Electromagnetic Fields Generated by Overhead and Buried Short Conductors Part 2 - Ground Networks

    Publication Year: 1986 , Page(s): 112 - 119
    Cited by:  Papers (20)
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    The fundamental concepts and analytical development related to electromagnetic fields generated by a network consisting of cylindrical conductors arbitrarily located in a conducting homogeneous soil are described and discussed. This method is applicable to overhead conductor networks as well. A Comprehensive sensitivity analysis based on the single and multiple point current injection techniques is conducted. In particular, the surface electric and magnetic fields caused by an impressed current between the center point and the four corner points of a grounding network is examined. The analysis is conducted for uniform and two-layer soils. The results show that the electric and magnetic fields can be used for detecting broken conductors. It is also shown that the longitudinal currents, leakage currents, earth potentials and magnetic fields are influenced by frequency, points of current injection and configuration of the network. View full abstract»

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  • Distribution of Induced Grounding Current in Large-Capacity Gis Using Multipoint Grounding System

    Publication Year: 1986 , Page(s): 120 - 127
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    This paper deals with the distribution of induced grounding current in a large-capacity full GIS using a multipoint grounding system, while referrring to main points in applying a multipoint grounding system in large-capacity GIS's. View full abstract»

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  • Notice to Readers

    Publication Year: 1986 , Page(s): 128
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    First Page of the Article
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  • Probabilistic Short-Circuit Uprating of Station Strain Bus System - Probabilistic Formulation

    Publication Year: 1986 , Page(s): 129 - 136
    Cited by:  Papers (5)
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    This paper Is the second in the series dealing with probabilistic station strain bus uprating. The paper describes the formulatlon, computational procedure and analytical techniques for evaluating Insulator assembly failures due to conductor bundle collapse and conductor swingout. In addition, the problem of conductor clearance has been formulated to determine the probability of Inter-phase flashover. This paper provides detailed descriptions of all the steps involved In the comprehensive probabilistic analysis and presents an application of this technique to a real case of a transformer station (Middleport TS) in Ontario Hydro's power system. View full abstract»

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  • Probabilistic Short-Circuit Uprating of Station Strain Bus System - Reliability and Operating Considerations

    Publication Year: 1986 , Page(s): 137 - 141
    Cited by:  Papers (4)
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    A probabilistic approach to the short-circuit current uprating of station strain bus system has been described in two companion papers [1,2]. This paper discusses the impact of using this approach on (1) the reliability of supply to low voltage buses at tapped stations, (2) the probability of operating the bulk electricity system in high risk states, and (3) the operating security after occurrences of contingencies involving strain bus failures. It was found that probabilistic uprating would not significantly affect the above system performance parameters. View full abstract»

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  • Interpretation of Soil Resistivity Measurements: Experience with the Model SOMIP

    Publication Year: 1986 , Page(s): 142 - 151
    Cited by:  Papers (15)
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    A method and a computer program for interpreting soil measurement data are presented. The method employs a statistical estimation of soil parameters from four pin or three pin measurements. The analysis provides (1) the best estimate of soil parameters, (2) the error of the parameters versus confidence level, (3) a pictorial view of how well the estimated soil model fits the measurements, and (4) the measurements which are not consistent (bad measurements). The methodology is applicable to data obtained with four or three pin method over a small or a large area. It performs best when applied to measurements taken at various locations of the area of interest. A computer program has been developed based on this methodology with the symbolic name SOMIP (SOil Measurements Interpretation Program). Implementation details are discussed in this paper. The performance of the methodology is compared with test model data. In addition, the experience gained in interpreting soil resistivity measurement with the program SOMIP is presented in this paper. Specifically, many sets of actual data, taken from four major utilities, has been analyzed and the results are presented and discussed. View full abstract»

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  • Engineering and Construction of a Gas-Insulated Substation in an Area of Potential Seismic Activity

    Publication Year: 1986 , Page(s): 152 - 158
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    A large 500/220 kV gas-insulated switchgear (GIS) for bulk power transmission has been installed in the extra high voltage (EHV) network in California. The station is situated outdoors in a region with potential seismic activity, a desert type climate and close to residential areas. These circumstances, together with long and complicated connections to incoming high voltage lines, presented a set of requirements that could best be served by a GIS type of substation. This was the first large EHV GIS to be installed on the Edison system. Experience from design, testing and installation of the GIS equipment is reported, as well as various means to cope with problems and items such as insulation coordination, disconnector transient overvoltages, thermal dimensioning of buses in trenches and seismic dimensioning. View full abstract»

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  • An Integrated Station Local Control-Telecontrol System, in the Scenario of an Overall Telecontrol System

    Publication Year: 1986 , Page(s): 159 - 165
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    A distributed local control system which is easily integrated in an already existing telecontrol network and provides new features to the overall system is described. The system is a Local Area Network with a hierarchically structured tree topology. It can be connected by a Packet-Switching-Network or by dedicated links to several Control Centers, to other RTU's, to Teletex Terminals and to special purpose Maintenance Terminals provided by the system. These features allow for flexible management of the overall information generated by the Power System, and a large cost reduction in the wiring of the stations. View full abstract»

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  • Unsymmetrical Control of Escom 132 KV and 400 KV Static Compensators

    Publication Year: 1986 , Page(s): 166 - 172
    Cited by:  Patents (1)
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    The paper briefly presents the unsymmetrical control system provided for the ESCOM 132 and 400 kV static compensators and describes its interaction with the ac system with reference to i) parallel operation of compensators, ii) second harmonic resonance problem, iii) fault clearing by sinqle-phase auto-reclose, and iv) voltage control. View full abstract»

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Aims & Scope

Installation and operation of apparatus, equipment, structures, materials and systems for the safe, reliable and economic generation, transmission, distribution, conversion, measurement and control of electric energy.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Wilsun Xu
Ph.D., P.Eng.
Dept. Electrical and Computer Eng.
University of Alberta
(9107 - 116 Street)
Edmonton, Alberta T6G 2V4 Canada
wxu@ualberta.ca
Phone:780-492-5965
Fax:780-492-1811