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Issue 1 • Jan.-2000
Showing 1-25 of 68
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Ampacity of diversely loaded cables in covered and uncovered trays
Publication Year: 2000,Page(s):3 - 7
The existing code for ampacity of cables in a tray does not account for load diversity among the cables and it does not consider the presence of tray covers. This paper provides two factors that can be used to determine ampacity values for these two cases. These factors can be used in conjunction with existing code ampacity values so that cable ampacities can be calculated for diversely loaded, co...Show More
Ampacity of diversely loaded cables in covered and uncovered trays
Year: 2000 | Volume: 15 | Issue: 1
The practical use of optical sensors to measure direct high voltages can be limited by their high sensitivity. A new optical high voltage measurement technique for applying to high voltage levels up to 400 kV in a wide bandwidth between DC to 30 MHz is developed. A prototype of the optical voltage transformer is assembled using Pockels crystals in a multisegmented arrangement, a super luminescent ...Show More
Evaluation of single-point measurements method for harmonic pollution cost allocation
Publication Year: 2000,Page(s):14 - 18
Cited by: Papers (46)
This paper reports on the reliability of single-point measurements for harmonic pollution cost allocation. Simulated results give the correlation between the cost and four physical electrical quantities that can be measured at the end-user bus: harmonic active power; harmonic apparent power; total harmonic current squared; and nonfundamental apparent power squared. The nonfundamental apparent powe...Show More
Harmonic pollution metering: theoretical considerations
Publication Year: 2000,Page(s):19 - 23
Cited by: Papers (87)
Utilities in charge of electric energy distribution are also power quality stewards; they decide when and where mitigation equipment is required to maintain the quality of electric energy supplied to end-users. Once the mitigation equipment is installed, its cost must be recovered from the consumers who have caused the power quality problems. The fair allocation of this cost among those consumers ...Show More
The impact of large steel mill loads on power generating units
P. Solanics;K. Kozminski;M. Bajpai;J. Esztergalyos;E. Fennell;J. Gardell;C. Mozina;S. Patel;A. Pierce;V. Skendzic;P. Waudby;J. Williams
Publication Year: 2000,Page(s):24 - 30
Cited by: Papers (8)
Large steel mills can be potentially harsh loads on an electric power system, producing harmonic currents and unbalanced system loading. Since these large loads are typically supplied from the EHV power system grid, it must be recognized that not only will the system of the host utility be impacted, but neighboring utility systems could be impacted as well. Existing IEEE Standard 519-1992, IEEE Re...Show More
Numerical algorithm for overhead lines arcing faults detection and distance and directional protection
Publication Year: 2000,Page(s):31 - 37
Cited by: Papers (48)
In this paper, an overhead lines protection numerical algorithm, based on one terminal data and derived in the time domain, is presented. The fault location, direction and its nature (arcing or arcless fault) are estimated using the least error squares technique. The faulted phase voltage is modeled as a serial connection of fault resistance and arc voltage, offering more sophisticated line protec...Show More
Adaptive relay setting for flexible AC transmission systems (FACTS)
Publication Year: 2000,Page(s):38 - 43
The paper presents an apparent impedance calculation procedure for distance relaying of transmission lines involving FACTS devices, particularly the UPFC (unified power flow controller). The presence of UPFC significantly affects the trip boundaries which are also adversely affected by fault resistance combined with remote end infeed. Depending on the UPFC location, the trip boundary is influenced...Show More
Adaptive relay setting for flexible AC transmission systems (FACTS)
Year: 2000 | Volume: 15 | Issue: 1
Modeling and simulation of the power transformer faults and related protective relay behavior
Publication Year: 2000,Page(s):44 - 50
The modeling of power transformer faults and its application to performance evaluation of a commercial digital power transformer relay are the objectives of this study. A new method to build an EMTP/ATP power transformer model is proposed in this paper. Detailed modeling of the transformer relay is also discussed. The transient waveforms generated by ATP under different operating conditions are ut...Show More
Reducing dead time for single-phase auto-reclosing on a series-capacitor compensated transmission line
Publication Year: 2000,Page(s):51 - 56
Cited by: Papers (17)
This paper presents a single-phase auto-reclosing study of a 500 kV Vietnamese transmission line. The success of the single-phase auto-reclosing depends on the extinction of the secondary arc. Therefore, the influences of several factors such as shunt and neutral reactors, faulted phase and location, capacitive and inductive coupling and series capacitor discharge on the extinction of secondary ar...Show More
A current transformer model based on the Jiles-Atherton theory of ferromagnetic hysteresis
U.D. Annakkage;P.G. McLaren;E. Dirks;R.P. Jayasinghe;A.D. Parker
Publication Year: 2000,Page(s):57 - 61
Cited by: Papers (180)
The hysteresis loop of the core material in a test current transformer is simulated using the Jiles-Atherton theory. Comparisons are made between recorded and simulated waveforms and it is found necessary to replace the modified Langevin function used by Jiles and Atherton. Using an alternative function described in the paper, good agreement is achieved between test and simulated waveforms.Show More
Mathematical models for current, voltage, and coupling capacitor voltage transformers
D.A. Tziouvaras;P. McLaren;G. Alexander;D. Dawson;J. Esztergalyos;C. Fromen;M. Glinkowski;I. Hasenwinkle;M. Kezunovic;L. Kojovic;B. Kotheimer;R. Kuffel;J. Nordstrom;S. Zocholl
Publication Year: 2000,Page(s):62 - 72
Cited by: Papers (173)
This paper reviews a number of mathematical models used to represent the nonlinear behavior of the magnetic core of instrument transformers. Models of instrument transformers using these core representations are presented. The transient response of the instrument transformer is compared to actual test results recorded in the laboratory. The paper provides practical guidelines as to which of the ph...Show More
Removal of DC offset in current and voltage signals using a novel Fourier filter algorithm
Publication Year: 2000,Page(s):73 - 79
Cited by: Papers (159)
Protecting transmission lines frequently involves adopting distance relays. Protective relays must filter their inputs to reject unwanted quantities and retain signal quantities of interest. Accuracy and convergent speed of the filter algorithm are essential for protective relays. A widely applied filter algorithm, the discrete Fourier transform (DFT) can easily erase harmonics using simple calcul...Show More
Experimental testing of a neural network based digital differential relay for synchronous generators
Publication Year: 2000,Page(s):80 - 85
Cited by: Papers (8)
This paper describes the laboratory implementation and real-time test results of a new neural network (NN) based digital differential relay used for detecting faults and classifying internal faults in the stator winding of synchronous generators. Details of the software written to enable the operation of the relay are described. Behavior of the NN based relay is observed and the experimental resul...Show More
New family of digital filters for phasor computation [power system relay protection]
Publication Year: 2000,Page(s):86 - 91
Cited by: Papers (16)
A new family of digital filters is presented in this paper. They have been specially designed with the aim of reducing the leakage of the conventional Fourier filter. That reduction is achieved by changing its rectangular window by a new family of windows with smaller sidelobes. Considered as frequency responses of lowpass filters, the window spectra are translated to the fundamental frequency to ...Show More
New family of digital filters for phasor computation [power system relay protection]
Year: 2000 | Volume: 15 | Issue: 1
A fault diagnosis expert system for distribution substations
Publication Year: 2000,Page(s):92 - 97
Cited by: Papers (102)
This paper presents a practical expert system for the diagnosis of various faults which may occur in distribution substations. The backward inexact reasoning process is applied for the fault section estimation using the knowledge of topology, the operation rules of protective devices, heuristic knowledge of well-trained operators, and instantaneous alarms. In this paper, the overall structure, det...Show More
Development of a prototype of a compact 145 kV substation inside a metallic building
Publication Year: 2000,Page(s):98 - 102
Cited by: Papers (1)
This paper presents the development of a prototype of a substation of 145 kV, BIL 650 kV, taking into account the decrease of the bus electrical insulation clearance, combined with the installation inside a metallic building. Only conventional equipment, usually found on the market, were applied in the prototype. During the preliminary approach, tests were carried out in the high-voltage laborator...Show More
Nodal frequency analysis of grounding systems considering the soil ionization effect
Publication Year: 2000,Page(s):103 - 107
Cited by: Papers (70)
Soil ionization takes place when the current leaking into the earth is high enough to produce an electric field intensity greater than a critical value. This phenomenon lowers the ground impedance and it is similar to an apparent increase in the electrode dimensions. Soil ionization has a great influence on the performance of small grounding electrodes fed by currents of high magnitude (i.e., ligh...Show More
A practical method for evaluation of ground fault current distribution on double circuit parallel lines
Publication Year: 2000,Page(s):108 - 113
Cited by: Papers (18)
The paper presents an original analytical procedure for quick and, for practical purposes sufficiently accurate evaluation of the principal components of the ground fault current. The procedure is valid for faults at any of the towers of a double 3-phase circuit line with an arbitrary number of spans. The method is obtained by application of relatively simple and exact equations for uniform ladder...Show More
This paper presents an alternative method for the transient analysis of dynamical systems. The method consists of the traditional frequency domain analysis to capture the steady state operation of the system and a wavelet-based transient analysis which captures the disturbance. The total solution is obtained from the superposition of the steady state and disturbance solutions. This paper focuses o...Show More
Disconnector switching in GIS: three-phase testing and phenomena
R.P.P. Smeets;W.A. van der Linden;M. Achterkamp;G.C. Damstra;E.M. de Meulemeester
Publication Year: 2000,Page(s):122 - 127
Cited by: Papers (18)
Certification tests in accordance with the requirements of the recent IEC 61259 standard for switching of bus-charging current by disconnecters of a (three-phase enclosed) 145 kV gas insulated switchgear (GIS) are described. These tests are primarily aimed at verifying that the discharge between the disconnector contacts does not introduce internal arc faults. Special emphasis is given to the high...Show More
Electro-thermal-mechanical computations in ZnO arrester elements
Publication Year: 2000,Page(s):128 - 134
Cited by: Papers (13)
Transient, nonlinear finite element analysis with coupled thermal and electric fields is employed to compute the electric and thermal field distributions in ZnO arrester elements, including both nonlinear electrical and nonlinear thermal properties. Mechanical stress in the element is computed during post processing, based on the thermal field. The data indicate that a metallic protrusion from the...Show More
Effect of resistance on lightning return stroke current
Publication Year: 2000,Page(s):135 - 141
Cited by: Papers (4)
This paper describes a new method of calculation to determine the return stroke current by integrating all discharge currents along the channel. Using this method, the effect of added resistance in the lightning discharge channel is calculated. We find that the values of peak current, current risetime, and current-time derivative along the channel are strongly influenced by an additional resistanc...Show More
Three-phase short circuit testing of high-voltage circuit breakers using synthetic circuits
Publication Year: 2000,Page(s):142 - 147
Cited by: Papers (12)
High-voltage circuit-breakers have reached such high short-circuit breaking capabilities that they must be tested in synthetic circuits with separate current and voltage sources. As the main performance to be verified by type tests is the interruption of three-phase faults, it is desirable whenever possible to perform three-phase tests. Three-phase synthetic testing is rather new and not covered b...Show More
Measurement of eddy-current loss coefficient P/sub EC-R/, derating of single-phase transformers, and comparison with K-factor approach
Publication Year: 2000,Page(s):148 - 154
Cited by: Papers (57)
A power amplifier is used to supply sinusoidal currents of different frequencies for measuring eddy-current losses of a 25 kVA single-phase transformer under short-circuit condition. Measured data show that eddy-current loss is a linear function of frequency with power of 2 and the eddy-current loss coefficient P/sub EC-Rlinear/ is computed. New measurement techniques are applied to determine the ...Show More
On-line diagnostics of high-voltage bushings and current transformers using the sum current method
Publication Year: 2000,Page(s):155 - 162
Experience with the application of the sum current method to on-line diagnostics of high-voltage bushings and current transformers is presented. The method and analysis are described along with field experience obtained at fourteen substations, comprising 56 sets of (three) bushings and current transformers. The influences of temperature, humidity and changes in more than one bushing are discussed...Show More
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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