Journal ArticleDOI
Contribution to studies on calculation of the magnetic field under power lines
TLDR
In this paper, a theoretical study of the calculation of magnetic fields in vicinity of overhead electric power lines is presented, where exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique and on the concept of complex ground return plane are presented.Abstract:
The paper presents in a tutorial manner a theoretical study of the calculation of magnetic fields in vicinity of overhead electric power lines. Exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique and on the concept of complex ground return plane are presented. The decomposition of the magnetic fields in two components: magnetic field obtained in free space from the Biot-Savart law and the magnetic field produced by earth current is discussed. It is shown that in practical cases the effects from earth currents can be neglected as compared with effects from line currents. A solution for modeling magnetic fields produced by sagging conductor, described by the catenary equation, is also proposed. The effect of the catenary on the magnetic field spatial distribution is investigated. The calculation results of magnetic field produced by sagging conductor and the magnetic field of a conventional model consisting of a horizontal conductor hanging on the effective height lying between the maximum and minimum heights of catenaries is compared and discussed. As an example the magnetic field of a real-power catenary high voltage 2 × 220 kV power line is demonstrated. Copyright © 2006 John Wiley & Sons, Ltd.read more
Citations
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Proceedings ArticleDOI
Noncontact Operation-State Monitoring Technology Based on Magnetic-Field Sensing for Overhead High-Voltage Transmission Lines
TL;DR: In this paper, a noncontact technology of operation-state monitoring based on magnetic-field sensing for high-voltage transmission lines was proposed, which can simultaneously measure both electrical and spatial parameters in real time.
Journal ArticleDOI
Estimation of Current and Sag in Overhead Power Transmission Lines With Optimized Magnetic Field Sensor Array Placement
TL;DR: A robust phase current and sag estimation method at support structures using dual-axis magnetic field sensors equal to the number of phase conductors based on the Biot–Savart law for smart grid power distribution.
Journal ArticleDOI
Estimating Sag and Wind-Induced Motion of Overhead Power Lines With Current and Magnetic-Flux Density Measurements
Arsalan Habib Khawaja,Qi Huang +1 more
TL;DR: A novel method to cater for sag and motion estimation in real-world scenarios is presented, which can detect a change in sag and conductor motion, whether it is symmetrical or unsymmetrical to one or more conductors.
Journal ArticleDOI
Monitoring of Overhead Transmission Lines: A Review from the Perspective of Contactless Technologies
TL;DR: In this article, a comprehensive review of non-contact technologies for overhead power transmission lines is presented, with emphasis on the practical implementation of advanced noncontact technologies, while considering optimization of the high voltage transmission lines parameters.
Journal ArticleDOI
Calculation of the Connected Magnetic and Electric Fields Around an Overhead-Line Tower for an Estimation of Their Influence on Maintenance Personnel
TL;DR: In this paper, the 3D magnetic and electric fields in terms of the influence of a steel tower are calculated and compared with reference values in order to predict an optimal climbing route on the tower.
References
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Book
Table of Integrals, Series, and Products
TL;DR: Combinations involving trigonometric and hyperbolic functions and power 5 Indefinite Integrals of Special Functions 6 Definite Integral Integral Functions 7.Associated Legendre Functions 8 Special Functions 9 Hypergeometric Functions 10 Vector Field Theory 11 Algebraic Inequalities 12 Integral Inequality 13 Matrices and related results 14 Determinants 15 Norms 16 Ordinary differential equations 17 Fourier, Laplace, and Mellin Transforms 18 The z-transform
Journal ArticleDOI
Wave propagation in overhead wires with ground return
TL;DR: The problem of wave propagation along a transmission system composed of an overhead wire parallel to the (plane) surface of the earth, in spite of its great technical importance, does not appear to have been satisfactorily solved.
Journal ArticleDOI
The Complex Ground Return Plane a Simplified Model for Homogeneous and Multi-Layer Earth Return
TL;DR: In this article, the authors introduce the concept of an ideal (superconducting) current return plane placed below the ground surface at a complex distance p equal to the complex penetration depth for plane waves.
Journal ArticleDOI
The Complex Ground Return Plane a Simplified Model for Homogeneous and Multi-Layer Earth Return
Deri,Tevan,Semlyen,Castanheira +3 more
Journal ArticleDOI
Magnetic fields from electric power lines: theory and comparison to measurements
R.G. Olsen,D. Deno,R.S. Baishiki,J.R. Abbot,R. Conti,M. Frazier,K. Jaffa,G.B. Niles,J.R. Stewart,R. Wong,R.M. Zavadil +10 more
TL;DR: In this article, it was shown that the critical factor in predicting magnetic fields at ground level is the location and magnitude of the return current, i.e., the current in all power line conductors and current which flows in the earth.