Magnetic Field Management Considerations for Underground Cable Duct Bank

Bascom, E.C.; Banker, W.A.; Boggs, S.A.

doi:10.1109/tdc.2006.1668529

Cited by 8 publications

(18 citation statements)

References 3 publications

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“…But one unexpected issue observed in [9] arises also in this work, as shown in Fig. 13, where it is represented the SE profile provided by the horizontal plate and the reverse-U (made of aluminium and LCS with the reference dimensions) at 1 m above ground surface when phases are arranged in vertical and triangular formation (results of the horizontal case are similar to the vertical configuration).…”

Section: Mf At the Edges Of The Right-of-waymentioning

confidence: 52%

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Magnetic Field Shielding of Underground Cable Duct Banks

Romero¹,

Del-Pino-López²

2013

PIER

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Abstract-In this paper an in-depth parametric analysis of shielding effectiveness obtained when using ferromagnetic or conductive screens to mitigate the field generated by duct banks is presented. Due to the need of a case-by-case approach, all the simulations, performed by a finite element software (GetDp), are applied to a case study composed by 9 (3 × 3) ducts, with six of them including high voltage single-core cables and the three left empty for eventual future expansion. Two shielding geometries are tested: horizontal and U-reverse, changing in each one the main parameters: width, thickness, clearance to conductors, etc. Moreover, the conductors are grouped in two balanced in-phase three-phase circuits arranged in three configurations: vertical, horizontal and triangular. The mutual phase ordering of both circuits is the one that minimizes the field, so no further field reduction can be obtained by simple methods. The power losses and cost of different shielding solutions are also presented, including the effect of adding a third circuit if required.

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Section: Mf At the Edges Of The Right-of-waymentioning

confidence: 52%

“…In fact we have found just the paper [9] that deals with this topic, where the horizontal and U-reverse magnetic shields are analysed for the case of a 3 × 3 duct bank with two triangular balanced three-phase circuits.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Shielding of Underground Cable Duct Banks

Romero¹,

Del-Pino-López²

2013

PIER

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“…이를 위해 본 논문에 서는 케이블 구성조건별로 구분하고 각각에 대해 이론적으로 자 계를 계산하여 제시하였다. 자계해석은 Biot-Savart 법칙 이론을 이용하였다 [8][9][10].…”

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Magnetic Field Analysis in Accordance with Line Configuration Type in Underground Transmission Systems

Lee¹,

Lee²

2015

The Transactions of The Korean Institute of Electrical Engineer

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-This paper describes magnetic field on power cable in underground transmission systems. Based on specification which is being used in domestic power utility, magnetic field was analyzed in accordance with line arrangement, line burial depth and phase spacing. Magnetic field magnitude and its trend were understood in each circuit type such as double circuits, triple circuits and quadruple circuits of underground transmission systems. In addition, magnetic field was analyzed according to phase arrangement changing in each circuit. Finally, the proper phase arrangement configuration type was suggested by the evaluation of analysis result. Magnetic field was calculated by using Biot-Savart's law. According to the evaluated magnetic fields based on phase layout configuration in each circuit, it figured out that each of magnetic fields was different. As a result, this paper proposes a proper phase layout configuration for generating minimum magnetic field. It is evaluated that the phase layout configuration in each circuit proposed in this paper can be used at actual underground transmission systems.

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“…A contribuição da profundidade dos cabos para a mitigação do campo magnético de LSAT é tratada em [15] e [18]. De acordo com resultados de cálculos analíticos realizados nestes trabalhos, verifica-se que o aumento da profundidade dos cabos contribui para menores intensidades de campo magnético na superfície.…”

Section: Profundidade Dos Cabosunclassified

“…Também é válida para o caso de LSAT constituída por um circuito composto por dois cabos por fase. A influência da permutação de fases é mencionada em [15], [18] e [19]. Segundo estudos analíticos presentes nestes trabalhos, pode-se constatar que através da permutação das fases de um circuito e da manutenção do posicionamento das fases do outro, é possível obter uma redução considerável da intensidade do campo magnético na superfície.…”

Section: Permutação De Fasesunclassified

Estudo de instalações de linhas subterrâneas de alta tensão com relação a campos magnéticos.

Oliveira¹

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pela orientação e sugestões na condução desta pesquisa. Agradeço-lhe pela confiança e pela oportunidade de realizar este trabalho.Ao Dr. Mario Leite Pereira Filho, pelo interesse, pelas sugestões e pelo auxílio na realização da parte prática deste trabalho. Agradeço-lhe pelas orientações e recursos disponibilizados para a medição de campo magnético das linhas subterrâneas.Ao Eng. Aloísio José de Oliveira Lima, por compartilhar seus amplos conhecimentos sobre sistemas subterrâneos, os quais foram imprescindíveis para o desenvolvimento deste trabalho. Agradeço-lhe também pela paciência, pelo desprendimento ao compartilhar sua experiência, pelos incentivos e, sobretudo, por sua amizade. À Eng. Simone Moreira Dias, pela sua valiosa ajuda durante a campanha de medição de campo magnético das linhas subterrâneas. Agradeço-lhe também pela sua dedicação, paciência, carinho e companheirismo durante todas as etapas de desenvolvimento deste trabalho.vi ABSTRACT Nowadays, the intensity of electric field, magnetic field and electromagnetic field is a determining factor, not only for implantation of new installations, but also for existing installations in the power system. Although no exist conclusive study that proves the direct evidence between exposure to these fields and adverse effects on human health, many countries, including Brazil, have defined in their laws basic limits for exposure to electric and magnetic fields produced by the electric system. This work aims to contribute to analysis of magnetic field for both existing high voltage underground lines and lines in initial stage of project, aiming the actual exposure limits of the local legislation. In it, is shown the magnetic field calculation methodology based on the Biot-Savart´s law and the superposition principle. Analytical studies to verify the influence of installation and electrical parameters of lines on the magnetic field are presented for high voltage underground lines consist of one and two circuits with different types of installation and earthing. Comparisons between analytical and measurement values of magnetic field of existing high voltage underground lines in operation are also addressed in this work. The main mitigation techniques of magnetic field used in high voltage underground lines, such as compensation techniques by loop of cables and shielding by metallic materials, are also presented.Due the electric field outside the insulated cable be practically zero, issues related to the electric field are not addressed in this work. For simplicity, the magnetic field refers to the magnetic flux density in this document.

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Magnetic Field Management Considerations for Underground Cable Duct Bank

Cited by 8 publications

References 3 publications

Magnetic Field Shielding of Underground Cable Duct Banks

Magnetic Field Shielding of Underground Cable Duct Banks

Magnetic Field Analysis in Accordance with Line Configuration Type in Underground Transmission Systems

Estudo de instalações de linhas subterrâneas de alta tensão com relação a campos magnéticos.

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