Transmission line fields

Deno, Don W.

doi:10.1109/t-pas.1976.32259

Cited by 69 publications

(17 citation statements)

References 4 publications

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“…When the system is unsymmetrical this will result in an AC potential along the pipeline. The electric and magnetic fields under the transmission lines are complex functions of the conductors size, spacing and clearance from the flat grounding [4].The calculated electric and magnetic fields for over head lines having m conductors is: Where: L t transmission line inductance, Lp pipeline and associated equipment inductance, and K is the coefficient of coupling depending on the location (/km). If R is the resistance of earth and pipeline with its coating, then the current induced in the pipeline is:…”

Section: Induced Voltage On Pipelinesmentioning

confidence: 99%

Electromagnetic Interference between Electrical Power Lines and Neighboring Pipelines

Hossam-Eldin

Mokhtar

2008

2008 19th International Conference on Systems Engineering

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Electromagnetic Field interference caused by electric power lines sharing the same corridor with pipelines can produce the unsafe operation of the protection and measuring systems of the pipeline under both normal and faulty conditions. Voltages can be induced on the pipelines from power lines in the areas where they run in parallel together. These voltages vary with the electrical characteristics and geometry of both systems. These voltages can affect the operating personnel, pipeline associated equipment, cathodic protection and the pipeline itself. Mitigation is required to reduce the voltage levels to limit that adverse effect for personnel and pipeline.

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Section: Induced Voltage On Pipelinesmentioning

confidence: 99%

Electromagnetic Interference between Electrical Power Lines and Neighboring Pipelines

Hossam-Eldin

Mokhtar

2008

2008 19th International Conference on Systems Engineering

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“…1), while larger axial ratios result in more elliptical traces (for example Table 9). The origin of magnetic field polarizations has been systematically studied for high-voltage power lines (Deno, 1976) but not for industrial sources like these.…”

Section: Polarizationmentioning

confidence: 99%

Hazard surveillance for industrial magnetic fields: II. Field characteristics from waveform measurements

Bowman

Methner

2000

The Annals of Occupational Hygiene

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Magnetic field characteristics have been surveyed systematically in six factories with the Multiwave® II waveform capture instrument. These six facilities manufactured plastics, pharmaceuticals, cement, liquid air products, aluminum parts, and aluminum-framed filters. The study goals were to survey the physical characteristics of magnetic fields that may be related to biological effects under various interaction mechanisms and to relate those characteristics to the field's sources. From 59 waveform measurements at worker locations near sources, we calculated the extremely low frequency (ELF) and static field magnitudes, their frequency characteristics, and spatial characteristics of the 60 Hz component. The RMS vector magnitude of the ELF magnetic field (the usual exposure metric in most studies) had medians ranging from 0.53 to 12.83 mT in the six factories. The static magnetic field magnitudes had medians of 24.2-46.2 mT, which is well below the geomagnetic reference field of 55.0 mT because of shielding from steel structures. The maximum static field was 128.6 mT near a DC motor. The frequency spectra of the most common fields is dominated by 60 Hz, and has a median total harmonic distortion equal to 14.8%. The most common higher frequencies are the third, fifth, and second harmonics of 60 Hz. However, magnetic fields in these workplaces had many other 60 Hz harmonics and non-harmonic frequencies due particularly to electric motors and computer monitors. The 60 Hz component magnetic fields have elliptical polarization with median axial ratio of 25.4%. The average proportion of the 60 Hz component parallel to the static field vector was 51.5±3.0%, which indicates a significant trend towards perpendicular orientation between these two field components. In this survey of only six factories, the Multiwave® II measurements documented a wide diversity of complex magnetic field characteristics and non-sinusoidal waveforms. Although these characteristics are important to the various mechanisms postulated to explain biological effects, they are overlooked by the popular exposure assessment methods which only measure the ELF magnitude. Therefore, spot measurements with the Multiwave® II or similar waveform capture instruments are necessary for a complete magnetic field exposure assessment. Published by Elsevier Science Ltd on behalf of British Occupational Hygiene Society.

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“…Electric field ellipses in vicinity of 3-phase transmission line. Although not shown in figure 2, the magnetic field at a point near a three-phase transmission line can also be represented by a rotating vector in space but in contrast to the electric field, the vector B is a rotating vector even at ground level [14].…”

Section: Ac Transmission Line Fieldsmentioning

confidence: 99%

Electrical parameters in 60-Hz biological exposure systems and their measurement :

Misakian¹

1984

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Transmission line fields

Cited by 69 publications

References 4 publications

Electromagnetic Interference between Electrical Power Lines and Neighboring Pipelines

Electromagnetic Interference between Electrical Power Lines and Neighboring Pipelines

Hazard surveillance for industrial magnetic fields: II. Field characteristics from waveform measurements

Electrical parameters in 60-Hz biological exposure systems and their measurement :

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