A critical study of a three-phase system of unarmoured single-conductor cables, from the standpoint of the power losses, line constants and interference with communication circuits

Wedmore, E.B.; Morgan, P. D.; Whitehead, S.

doi:10.1049/jiee-1.1929.0032

Cited by 6 publications

(2 citation statements)

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“…Unfortunately wide phase spacing results in increased induced losses and special bonding of cable sheaths is used to overcome the problem. Many papers have been written on special bonding systems and a full bibliography is included but, for completeness, a brief description of the influence of sheath losses on cable ratings is given [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58].…”

Section: Sheath Bonding Considerationsmentioning

confidence: 99%

Natural and forced-cooling of HV underground cables: UK practice

Williams

1982

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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The paper reviews the progress of the various forms of cable cooling systems that have been developed for the UK CEGB's major high-voltage transmission network. The generation and transmission system in the UK prior to the establishment of the 132kV grid is discussed, together with the reasons for building the higher-voltage network. The statutory duties of the CEGB and its transmission responsibilities are outlined, special reference being made to the undergrounding of part of the network for amenity reasons. The investigations of soil properties, their effect on cable ratings and the subsequent adoption of standardised thermal resistivity and temperature values are considered, together with the development of special backfill materials. The different types of forced cooling system are discussed: separate water-pipe, trough and weir, air, integrally and internally cooled methods being covered comprehensively. Rating limitations caused by cable joints, and the methods used to overcome them, are included. Cooling stations and the plant and control equipment installed therein are described, reference being made to the different sources of coolant, e.g. air, borehole water, river or lake water etc. A brief description of the computer methods of solving the complex equations derived for forced cooling installations, using thermal image, finite difference, finite element and analytical techniques, is given. The Appendix comprises three Tables, giving the essential design details of naturally cooled, separate-pipe water-cooled and tunnel systems installed on the CEGB's transmission system.

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Section: Sheath Bonding Considerationsmentioning

confidence: 99%

Natural and forced-cooling of HV underground cables: UK practice

Williams

1982

IEE Proc. A Phys. Sci. Meas. Instrum. Manage. Educ. Rev. UK

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“…80-2000 [9], the maximum sheath voltage at cable terminals should not exceed 50 V. Therefore, it is obvious that there are some guidelines about the induced sheath voltage limits. E. B. Wedmore et al [10] have prepared a guide to state the methods of selection of three separate unarmored single conductor cables. In this guide, the investigation consists of comparison of relative merits of cables laid in trefoil and flat formations.…”

Section: Introductionmentioning

confidence: 99%

Calculation of induced sheath voltage for transposed and untransposed cable conductors

Shaban

Salam

Ang

et al. 2015

TENCON 2015 - 2015 IEEE Region 10 Conference

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In this paper, we studied the power cables used in Berakas Power Management Company Brunei Darussalam (BPMC), with the aim of finding the optimal values of radius of the cables and their phase distance. The electromagnetic coupling effect creates many problems hindering safe operation of cables and produces induced voltages in metallic sheath or shield of cables. Therefore, the main objective of this paper is to contribute ways for reducing coupling effect by finding the optimal values of phase distance and radius and also by discovering proper arrangement of the cables. This paper presented a study of the electromagnetic coupling effect in underground power cables by examining induced voltages with the variation in phase distance in metal shield of cables. The study is carried out for both the flat and trefoil formations. Both the transposed and un-transposed conductors are also considered for comparison. It is found that the flat formation with transposition has less induced sheath voltage and there is no effect of transposition on trefoil formation. In addition, we calculated the optimal values of phase distance between cable conductors and the proper arrangement for the cables to minimize the induced voltage in metallic shield for the cables used in BPMC.

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