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Issue 2 • April-1996
Showing 1-25 of 66
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Development of 500-kV XLPE cables and accessories for long distance underground transmission line. III. Electrical properties of 500-kV cables
M. Fukawa;T. Kawai;Y. Okano;S. Sakuma;S. Asai;M. Kanaoka;H. Yamanouchi
Publication Year: 1996,Page(s):627 - 634
Cited by: Papers (28)
500-kV XLPE-insulated cable with an insulation thickness of 27 mm has been developed for long-distance transmission lines. Basic studies on 500-kV XLPE cable have shown that contaminants in the insulation may be the factor determining electrical performance. This hypothesis is justified by the good correlation obtained between statistical estimations of the size of the largest contaminant in the i...Show More
Development of 500-kV XLPE cables and accessories for long-distance underground transmission lines. IV. Electrical properties of 500-kV extrusion molded joints
N. Takeda;S. Izumi;K. Asari;A. Nakatani;H. Noda;M. Yamaguchi;M. Tan
Publication Year: 1996,Page(s):635 - 643
Cited by: Papers (13)
Joints for 500-kV XLPE cable are now under development in Japan to enable the long-distance transmission of high-capacity power to urban areas. Basic research was carried out from 1989 to 1992 that determined joint type and design values. This paper reports on the electric performance of the fabricated joints. Various tests were conducted to evaluate the performance and the design values. As a res...Show More
Interference of nonlinear ferromagnetic pipeline on magnetic field produced by power lines
Publication Year: 1996,Page(s):644 - 649
Cited by: Papers (3)
The investigation of the magnetic field produced by power lines has drawn a lot of attention from researchers. Since sharing space by buried power lines and pipelines has become commonplace, it is of interest to investigate the influence of the pipeline. In this paper, we study the change of the magnetic field produced by buried cables, due to an additional steel pipe nearby. A Fourier series tech...Show More
Computation of the magnetic field generated by an underground pipe-type cable
Publication Year: 1996,Page(s):650 - 655
Cited by: Papers (5)
A hybrid computational method for predicting the magnetic field in the vicinity of an underground three-phase pipe-type cable is presented in this paper. This hybrid method combines the numerical techniques of the finite element method and the unimoment method. An iterative solution procedure is developed and employed to treat the nonlinear B-H characteristic of the steel pipe. To validate the com...Show More
Computation of the magnetic field generated by an underground pipe-type cable
Year: 1996 | Volume: 11 | Issue: 2
Oil-filled cable surveillance system using newly developed optical fiber gas sensor
Publication Year: 1996,Page(s):656 - 662
Cited by: Papers (9)
A new surveillance system for oil-filled power cables, which can provide continuous monitoring using a newly developed optical gas sensor that can detect the concentration of the gas dissolved in the oil with extremely high sensitivity, has been developed. It was proved that the degree of deterioration of the insulating oil can be detected by measuring C/sub 2/H/sub 2/ and CH/sub 4/ by investigati...Show More
Study on detection for the defects of XLPE cable lines
K. Uchida;S. Kobayashi;T. Kawashima;H. Tanaka;S. Sakuma;K. Hirotsu;H. Inoue
Publication Year: 1996,Page(s):663 - 668
Cited by: Papers (43)
This paper reports the results of a basic study of testing methods to replace the DC after laying test that is presently most frequently used as an after laying test for XLPE power cable lines. Chosen as the alternative waveforms for DC voltage were damped oscillating wave (OSW) and very-low-frequency wave (VLF) voltages. Experiments were conducted on the ability to detect various types of line de...Show More
Study on detection for the defects of XLPE cable lines
K. Uchida;S. Kobayashi;T. Kawashima;H. Tanaka;S. Sakuma;K. Hirotsu;H. Inoue
Year: 1996 | Volume: 11 | Issue: 2
Study on molded joint by curable PE block insulation for XLPE insulating cable under extra high voltage
A. Toya;M. Kurihara;T. Shimomura;K. Kondo;S. Nakamura;M. Kawahigashi;I. Otaka
Publication Year: 1996,Page(s):669 - 675
Cited by: Papers (3)
A block molded joint under extra high voltage made to drastically reduce power cable installation time has been developed. Through its excellent performance, the joint is expected to be substituted for the extrusion molded joints which are widely used in 275 kV class XLPE power cables for long distance power transmission.Show More
PULLFLEX-new software for duct-cable pulling forces
Publication Year: 1996,Page(s):676 - 682
Cited by: Papers (3)
This paper addresses the need to increase the section lengths of electrical distribution cables in underground ducts by reducing the uncertainty of present analytical predictions for maximum pulling forces exerted on the cable during installation. New analytical models are proposed to take into account several additional effects related mainly to the bending stiffness of the cable. These bending e...Show More
Communication system requirements for implementation of a large scale demand side management and distribution automation
Publication Year: 1996,Page(s):683 - 689
Cited by: Papers (19)
Large scale system implementation of demand side management (DSM) and distribution automation (DA) intended for an electric utility network serving a large customer base (one million or larger) spread over a large geographical area requires a two-way communication system. Unlike pilot projects where testing and feasibility studies are highly structured and controlled, many of the results from the ...Show More
Communications field trials for total utility metering
Publication Year: 1996,Page(s):690 - 695
Cited by: Papers (11)
The privatisation of the water, gas and electricity utilities under United Kingdom Government legislation has led to new developments of these industries in a new competitive market. Metering systems for all these utilities has developed into a very innovatory market with all three utilities investigating novel and cost effective metering communications systems. This paper discusses current field ...Show More
Model system tests on a new numeric method of power system frequency measurement
Publication Year: 1996,Page(s):696 - 701
Cited by: Papers (65)
A numerical technique for the evaluation of power system frequency has been implemented on a TMS320C31 digital signal processor. The frequency measuring equipment has been tested on programmable relay testing equipment, using known reference signals, and on a micromachine based power system simulator. The results show the frequency measuring equipment gives fast and accurate measurement under both...Show More
Development of an optical current transducer with a bulk type Faraday sensor for metering
Publication Year: 1996,Page(s):702 - 707
Cited by: Papers (22)
An optical current transducer (OCT) with a bulk type Faraday sensor demonstrated 0.3% class accuracy for metering at a TVA substation. The Faraday sensor had Bi/sub 12/SiO/sub 20/ (BSO) single crystals with right and left optical rotatory power to cancel out temperature dependency. A prototype 161 kV OCT installed in a TVA substation verified 0.3% class performance. The OCT had the Faraday sensor,...Show More
Anatomy of power system blackouts: preventive relaying strategies
Publication Year: 1996,Page(s):708 - 715
Major blackouts of electric power systems in which many customers are left without power are rare events. However, the effects of blackouts, for instance, can be catastrophic. It has been observed that protective system failures are a contributing factor in a large proportion of these blackouts. The most troublesome protection system failures are hidden failures, which remain dormant during normal...Show More
Coding techniques for secure digital communications for unit protection of distribution feeders
Publication Year: 1996,Page(s):716 - 724
The dramatic growth in new designs of microprocessor relays has led to a growth in the use digital communications for protection. Unfortunately in any communication system there will always be some corruption of the received data. Part of the art and science of relay design is therefore to take this into account. This paper examines coding techniques designed to minimise the probability of corrupt...Show More
The effects of GIC on protective relaying
B. Bozoki;S.R. Chano;L.L. Dvorak;W.E. Feero;G. Fenner;E.A. Guro;C.F. Henville;J.W. Ingleson;S. Mazumdar;P.G. McLaren;K.K. Mustaphi;F.M. Phillips;R.V. Rebbapragada;G.D. Rockefeller
Publication Year: 1996,Page(s):725 - 739
Cited by: Papers (60)
This paper summarizes research and operating experience related to the effects of geomagnetically induced currents (GIC) on protective relaying. It shows that if the GIC causes high levels of harmonic distortion, there is a risk that the conventional protection system may not provide adequate protection for the capacitors, transformers, and generators. It recommends methods to reduce the risk of f...
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First Page of the Article
Show MoreMulti neural network based fault area estimation for high speed protective relaying
Publication Year: 1996,Page(s):740 - 747
The aim of this paper is to present a new approach to fault area estimation for high-speed relaying using feedforward neural networks. The suggested framework makes use of neurocomputing technology and pattern-recognition concepts. In contrast to conventional algorithms, our neural fault area estimator (NFAE) determines the fault area directly. This approach leads to very short propagation times a...Show More
Design and implementation of an adapative single pole autoreclosure technique for transmission lines using artificial neural networks
Publication Year: 1996,Page(s):748 - 756
Cited by: Papers (72)
Adaptive single pole autoreclosure (SPAR) offers many advantages over conventional techniques. In the case of transient faults, the secondary arc extinction time can be accurately determined and in the case of a permanent fault, breaker reclosure can be avoided. This paper describes, in some detail, the design and implementation of a SPAR technique using artificial neural networks (ANNs). The desi...Show More
An investigation into the use of adaptive setting techniques for improved distance back-up protection
Publication Year: 1996,Page(s):757 - 762
Changes in power system operating conditions adversely affect the reach point accuracy of distance relays. This paper discusses adaptation of the settings of distance relays within an integrated digital hierarchical protection system for the optimisation of relay performance. Specific reference is made to adaptation of the zone 3 setting to ensure optimal relay performance over a wide variety of o...Show More
Transient modeling of electromechanical relays. Part I: armature type overcurrent relay
Publication Year: 1996,Page(s):763 - 770
Cited by: Papers (9)
An electromechanical, armature type 50 relay is modelled in EMTP/ATP using TACS. Mechanical, magnetic, and electrical characteristics are represented in the form of simple mathematical models that can provide a useful tool for studying the dynamic responses of the armature type 50 devices and incorporating them into a power system transient analysis. This paper is the first part of a summary repor...Show More
Transient modeling of electromechanical relays
Publication Year: 1996,Page(s):771 - 782
Cited by: Papers (10)
An electromechanical, plunger type 50 relay is modelled in EMTP/ATP using TACS. Mechanical, magnetic, and electrical characteristics are represented in the form of simple mathematical models that can provide a useful tool for studying the dynamic responses of the Type 50 devices and incorporating them into a power system transient analysis. This paper is the second part of a summary report by Rens...Show More
CAPS: improving power system stability using the time-overvoltage capability of large shunt capacitor banks
Publication Year: 1996,Page(s):783 - 792
A new special stability control scheme, termed CAPS, improves power system stability by exploiting the time-overvoltage capability of large shunt capacitor banks. During low voltage emergencies, several series groups of wye-connected capacitor banks are shorted to increase reactive power output. Here, the authors describe successful commissioning tests on a 241.5 kV, 168 MVAr capacitor bank.Show More
Electromagnetic forces in three-phase rigid busbars with rectangular cross-sections
Publication Year: 1996,Page(s):793 - 800
Cited by: Papers (27)
A three-phase busbar arrangement with straight rigid conductors carrying short-circuit currents is investigated. Calculations are made assuming steady-state AC current with a peak value equal to the peak value of the short-circuit current. This assumption is used in the related IEC Standards 865/92. In this paper, the electromagnetic forces and current densities are calculated by solving the elect...Show More
Experimental investigation on the dynamic behavior of flexible conductors between substation equipment during an earthquake
Publication Year: 1996,Page(s):801 - 807
Cited by: Papers (29)
The effects of connections made of flexible conductors must be included in the seismic design of substation equipment. A common practice is to take account of their effects as static loading only, providing sufficient slack to permit the expected relative displacement between interconnected equipment during an earthquake. This paper presents the approach and the results of an experimental study pe...Show More
A fast and accurate analysis of grounding resistance of a driven rodbed in a two-layer soil
Publication Year: 1996,Page(s):808 - 814
Cited by: Papers (13)
A moment method of the Galerkin (variational) approach is applied to analyze the grounding resistances of driven rodbed of various configurations. Using this approach the resistance of a rodbed of N rods in two-layer soil requires only a matrix size of 2N/spl times/2N (two segments for each rod). The error in the calculated resistance is less than 4% compared to the resistance calculated by point ...Show More
Computer analysis of transient voltages in large grounding systems
Publication Year: 1996,Page(s):815 - 823
Cited by: Papers (215)
A computer model for transient analysis of a network of buried and above ground conductors is presented. The model is based on the electromagnetic field theory approach and the modified image theory. Validation of the model is achieved by comparison with field measurements. The model is applied for computation of transient voltages to remote ground of large grounding grid conductors. Also computat...Show More
Computer analysis of transient voltages in large grounding systems
Year: 1996 | Volume: 11 | Issue: 2
Contact Information
Editor-in-Chief
New York University, Department of Electrical and Computer Engineering
Brooklyn
USA
fdeleon@nyu.eduContact Information
Editor-in-Chief
New York University, Department of Electrical and Computer Engineering
Brooklyn
USA
fdeleon@nyu.eduIEEE Account
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