Determination of the open-circuit sheath voltages of cable systems

Adamson, Colin; Taha, Essam A.; Wedepohl, L.M.

doi:10.1049/piee.1968.0202

Proc. Inst. Electr. Eng. UK

1968

DOI: 10.1049/piee.1968.0202

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Determination of the open-circuit sheath voltages of cable systems

Colin Adamson

Essam A. Taha

L.M. Wedepohl

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1968

2024

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Cited by 2 publications

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Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid

Li,

Zhou,

Zhou

et al. 2024

High Voltage

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In urban power networks, a common practice is to bond numerous high‐voltage cable circuits to a single grounding grid located in underground tunnels, primarily for reasons of installation convenience. In these situations, excessively high levels of sheath currents were often detected during routine inspections, but no electrical faults were found to be responsible. Previous publications ignored the currents flowing through the shared grounding points into the closed sheath loops of different circuits. In this paper, a mathematical model is established for the current circulating among sheath loops of different circuits, and the factors influencing the circulating current were analysed. The abnormal excessive sheath current is demonstrated to be an increase in the circulating current due to the combined effect of electromagnetic coupling and the shared grounding grid. The circulating current depends on the induced voltages which, in turn, depends on the cable layouts and load currents. The effects of these factors are evaluated in various scenarios. The increase of the circulating current is verified in a field case where four electrically healthy cable circuits sharing the same grounding points were found to have abnormal excessive sheath currents.

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Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid

Li,

Zhou,

Zhou

et al. 2024

High Voltage

View full text Add to dashboard Cite

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Comparative steady-state performance of crossbonded cable systems

Adamson

Taha

Wedepohl

1968

Proc. Inst. Electr. Eng. UK

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SynopsisThe paper gives a universal system of steady-state analysis for any crossbonded and/or transposed cable system with unequal lays. It first introduces a nomenclature which enables any conductor or sheath to be identified in geometric and/or longitudinal position in any lay and/or section both for the general case and for four specific cases of crossbonding. It is then shown that the effect of unequal lays on sheath voltages, currents and losses may always be analysed, provided that there is rigorous adherence to the system of nomenclature. The paper is restricted to cases of unbalanced conductor currents in the steady state and does not deal with the additional variables and complexities when the various crossbonded systems have multiple-earthed points and are under external or internal unbalanced fault conditions. A large selection of graphical results is presented for sheath currents, losses and longitudinal sheath voltages of the three main cases of crossbonding. In the particular case of trefoil spacing, taken as an example, the influence of variation of lay length between 0-6 and 1 -4p.u. on the sheath currents and longitudinal induced voltages is shown. The results are discussed in detail since comparative performances for these various systems have not previously been presented. The conclusions extend also the analytical methods, it being shown that all crossbonded systems of whatever complexity can be analysed by the use of rotation matrices and the notation for nonuniform lay length; it follows en passant that normal symmetrical-component methods do not yield a solution, owing to the crossbonded systems having multiple unbalances and six degrees of freedom.

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Determination of the open-circuit sheath voltages of cable systems

Cited by 2 publications

References 7 publications

Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid

Analysis of excessive sheath currents in multiple cable circuits bonded to the same grounding grid

Comparative steady-state performance of crossbonded cable systems

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