Magnetic field reduction using high phase order lines

Stewart, James R.; Dale, S.J.; Klein, K.W.

doi:10.1109/61.216869

Cited by 44 publications

(13 citation statements)

References 6 publications

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“…The results of measurements have agreed very well with those predicted from calculations (Stewart et al, 1993). Additional calculations based on the design of the 12-phase test line were also made to provide a comparison with existing 3-phase lines.…”

Section: Introductionsupporting

confidence: 56%

“…Since increasing the phase order reduces the conductor surface electric "eld, all other things being equal, six-phase is a possible technique to allow voltage uprating of existing double circuit three-phase lines (Stewart et al, 1992) or construction of more compact con"gurations. High phase order is an additional design variable, which under some circumstances may be used to reduce ground level "eld (Stewart et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

“…in New York has restricted the maximum allowable electric and magnetic "eld values to be 1.6 kV/m and 200 mG, respectively at the edge of right of way for new power transmission lines. Others adopted electric and magnetic "eld values (Stewart et al, 1993) of 2 kV/m edge of right of way electric "eld and 150, 200 and 250 mG edge of right of way magnetic "eld for 230 and 500 kV and double circuit 500 kV lines, respectively. The regulations stated by the regulatory sta!s determine the width of right of way required for a given line design, or conversely, what lines can be constructed on a given right of way.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field of high-phase order and compact transmission lines

Ismail

2001

Int. J. Energy Res.

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SUMMARYResearch has been conducted in high phase order (HPO) power transmission wherein 6 or 12 phases are used to transmit power in less physical space and with reduced environmental e!ects than conventional designs. In this paper, existing 3-phase double circuit transmission lines (TL) are recon"gured to 6-phase systems for the purpose of calculating and comparing the magnetic "eld of both systems. The magnetic "eld of several single-phase con"gurations; #at, vertical, delta and inverted-delta with the same degree of compaction is calculated and analysed at 1 m height above the ground level. The magnetic "eld of the inverted-delta arrangement, which showed the lowest "eld pro"le, is compared with the magnetic "eld of 6-and 12-phase TLs having the same degree of line compaction and current loading conditions. The three systems are analysed when their lowest conductors had the same clearance to ground in one case and when their highest conductor positions were matched in another case. A comparison between 12-, 6-and 3-phase double circuit TLs having the same degree of compaction, the same phase voltage, the same clearance to ground and the same current per conductor is made to demonstrate if HPO lines reduce "elds or not. The 6-and 12-phase lines are raised while keeping their conductors within the space, which would be taken by the conductors of the double circuit line. In this case, the highest conductor positions of the two systems are matched and the magnetic "eld is recomputed to conclude the results. The vector magnetic "eld potential concept, as extended to HPO transmission lines, together with a #exible developed computer program are used to calculate and present the magnetic #ux density components pro"les around the mentioned systems.

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Section: Introductionsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic field of high-phase order and compact transmission lines

Ismail

2001

Int. J. Energy Res.

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“…(4) In (4), subscripts a, b, and c refer to the partition of phase bundles into three sub-conductor sets. Subscript G refers to ground wires and L subscript refers to the mitigation loop.…”

Section: Computation Of System Currentsmentioning

confidence: 99%

Mitigation of magnetic field under Egyptian 500kV overhead transmission line

Dein

2010

2010 7th International Multi- Conference on Systems, Signals and Devices

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The paper presents an efficient way to mitigate the magnetic field resulting from the three-phase 500kV single circuit high voltage transmission line existing in Egypt, by using a passive loop conductor in order to reduce the right-of-way (ROW). The paper used an accurate method for the evaluation of 50Hz magnetic field produced by overhead transmission lines. This method is based on the matrix formalism of multiconductor transmission lines (MTL). This method obtained a correct evaluation of all the currents flowing in the MTL structure, including the currents in the subconductors of each phase bundle, the currents in the ground wires, the currents in the mitigation loop, and also the earth return currents. Furthermore, the analysis also incorporates the effect of the conductor's sag between towers, and the effect of sag variation with the temperature on the calculated magnetic field. Good results have been obtained and passive loop conductor design parameters have been recommended for this system at ambient temperature (35°C).

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“…The bundled conductor and conductor design are optimized in [2,3], whereas the optimization of overhead power line costs, is performed in [4]. Additionally, the overhead power design, with the respect to the electromagnetic fields are discussed in [5,6], while the authors in [7] deal with different methods for reducing magnetic and electric fields emissions. This paper focuses on the new solution that determines the optimal arrangement of overhead power line conductors through a stochastic search algorithm called Differential evolution [8].…”

Section: Introductionmentioning

confidence: 99%

Seeking the optimal arrangements of overhead power line conductors with conductor sagging consideration

Deželak

Štumberger

2013

International Journal of Applied Electromagnetics and Mechanics

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This work deals with a new method that determines the optimal arrangements of overhead power line conductors by an optimization method called Differential evolution. During the optimization procedure the root mean square values of the electric field strength and the magnetic field density on the border of the overhead power line right of way are used as the main criteria. Both, electric and magnetic fields, are evaluated with methods, where the impact of conductor sagging is considered. The position of the each power line conductor is determined in an optimization process. In the given case, the aim of optimization is to find such arrangement of conductors where the values of the electric and magnetic fields on the border of the overhead power line right of way are under the prescribed limits, whereas the tower height is as low as possible.

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Magnetic field reduction using high phase order lines

Cited by 44 publications

References 6 publications

Magnetic field of high-phase order and compact transmission lines

Magnetic field of high-phase order and compact transmission lines

Mitigation of magnetic field under Egyptian 500kV overhead transmission line

Seeking the optimal arrangements of overhead power line conductors with conductor sagging consideration

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