Magnetic fields from electric power lines: theory and comparison to measurements

Olsen, R.G.; Deno, Don W.; Baishiki, Rod S.; Abbot, J.; Conti, R.; Frazier, M. J.; Jaffa, Kent C.; Niles, G. B.; Stewart, James R.; Wong, Ronald C.; Zavadil, R.

doi:10.1109/61.194025

Cited by 120 publications

(23 citation statements)

References 6 publications

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“…The problem of the different geometry of the carrying current wire was considered by Olsen et al (1988). They proposed approximating the current path by straight line segments with a constant current.…”

Section: Magnetic-field Distribution From a Very-low-frequency Currenmentioning

confidence: 99%

Subsea cable tracking in an uncertain environment using particle filters

Szyrowski

Sharma

Sutton

et al. 2015

Journal of Marine Engineering & Technology

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Localization of subsea cables is a demanding and challenging task. Among the few methods reported in the literature, magnetic field detection is the most promising one, as the cable does not require to be seen visually. Magnetic noise and a quick attenuation of the magnetic field propagating in sea water often make available methods unreliable. The authors propose a novel method of using particle filters for estimating the position of a subsea cable in a highly uncertain environment. The method was tested on data collected from a buried cable in the Baltic Sea, Denmark and shown to have a close approximation to the true location of the subsea cable. The method can be used to localize a subsea cable in an offshore noisy and uncertain environment and provides an inexpensive alternative to the use of a diver or a remotely operated platform.

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Section: Magnetic-field Distribution From a Very-low-frequency Currenmentioning

confidence: 99%

Subsea cable tracking in an uncertain environment using particle filters

Szyrowski

Sharma

Sutton

et al. 2015

Journal of Marine Engineering & Technology

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“…Various 2D models for computation of the overhead power line magnetic field are presented in [10][11][12][13][14][15][16][17][18][19], wherein each power line conductor catenary is approximated by a single thin-wire straight line with average height, parallel to the earth surface. This average height h can be described by following expression:…”

Section: Power Lines Geometrical Modelmentioning

confidence: 99%

“…Since the power line conductors take the form of a catenary, these 2D models are only a rough approximation, and therefore precise computation of the magnetic field, especially when field points are in the vicinity of the power line, is not possible. Besides these analytical and numerical 2D models [10][11][12][13][14][15][16][17][18][19], some commercial software packages, which are widely used for computation of power lines and substations electromagnetic field, use the same simplified 2D algorithm.…”

Section: Power Lines Geometrical Modelmentioning

confidence: 99%

3d Computation of the Power Lines Magnetic Field

Modrić¹,

Vujević²,

Lovrić³

2015

PIER M

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Abstract-In this paper, a 3D quasi-static numerical algorithm for computation of the magnetic field produced by power lines is presented. These power lines can be overhead power line phase conductors and shield wires or buried cable line phase conductors. The basis of the presented algorithm is the application of Biot-Savart law and the thin-wire approximation of cylindrical conductors. The catenary form of the power line conductors is approximated by a set of straight cylindrical segments. By summing up contributions of all conductor segments, magnetic field distribution is computed. On the basis of the presented theory, a FORTRAN program PFEMF for computation of the magnetic flux density distribution was developed. For each conductor catenary, it is necessary to define only global coordinates of the beginning and ending points and also the value of the longitudinal phase conductor current. Global coordinates of beginning and ending points of each catenary segment are generated automatically in PFEMF. Numerical results obtained by program PFEMF are compared with results obtained by simple 2D model and results obtained using software package CDEGS.

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“…In [16] the authors measure and model the magnetic fields produced by various power line configurations to evaluate the potential health hazard on humans. Their measurements show that the magnetic field strength near overhead transmission lines can be as strong as 17 milli-gauss and drops down to a still detectable 3-4 milli-gauss at 60 meters away.…”

Section: A Electric Field Sensingmentioning

confidence: 99%

Hardware Assisted Clock Synchronization for Real-Time Sensor Networks

Buevich

Rajagopal

Rowe

2013

2013 IEEE 34th Real-Time Systems Symposium

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Abstract-Time synchronization in wireless sensor networks is important for event ordering and efficient communication scheduling. In this paper, we introduce an external hardwarebased clock tuning circuit that can be used to improve synchronization and significantly reduce clock drift over long periods of time without waking up the host MCU. This is accomplished through two main hardware sub-systems. First, we improve upon the circuit presented in [1] that synchronizes clocks using the ambient magnetic fields emitted from power lines. The new circuit uses an electric field front-end as opposed to the original magnetic-field sensor, which makes the design more compact, lower-power, lower-cost, exhibit less jitter and improves robustness to noise generated by nearby appliances. Second, we present a low-cost hardware tuning circuit that can be used to continuously trim a micro-controller's low-power clock at runtime. Most time synchronization approaches require a CPU to periodically adjust internal counters to accommodate for clock drift. Periodic discrete updates can introduce interpolation errors as compared to continuous update approaches and they require the CPU to expend energy during these wake up periods. Our hardware-based external clock tuning circuit allows the main CPU to remain in a deep-sleep mode for extended periods while an external circuit compensates for clock drift. We show that our new synchronization circuit consumes 60% less power than the original design and is able to correct clock drift rates to within 0.01 ppm without power hungry and expensive precision clocks.

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Magnetic fields from electric power lines: theory and comparison to measurements

Cited by 120 publications

References 6 publications

Subsea cable tracking in an uncertain environment using particle filters

Subsea cable tracking in an uncertain environment using particle filters

3d Computation of the Power Lines Magnetic Field

Hardware Assisted Clock Synchronization for Real-Time Sensor Networks

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