Urquhart_07337599.pdf (460.56 kB)

Series impedance of distribution cables with sector-shaped conductors

Download (460.56 kB)
journal contribution
posted on 17.08.2015, 10:44 by Andrew J. Urquhart, Murray Thomson
Models of power distribution networks require accurate cable impedance data. For unbalanced networks, both the self-impedances and the mutual impedances are needed. However, published studies use differing approaches to determine cable impedances, leaving uncertainty over the level of detail required. This paper compares impedances provided by the manufacturer with those from several analytical methods, showing the impact of modelling the non-circular geometry and of including corrections allowing for the AC resistance. The analysis is compared to results from a freely available finite element solver where the current distribution is modelled in detail, taking account of eddy currents and the rotation of the cores relative to the neutral due to the cable lay. At 50 Hz, the analytical methods provide a good approximation but the finite element results show that eddy currents affect the impedance at harmonic frequencies. The results also show the impact of including the ground path in the impedance calculation. The current distribution in the ground has a wide cross-sectional area, suggesting that the assumption of a perfect multi-grounded neutral is inappropriate for LV networks with short cable lengths.
Logo branding

Categories

Keywords

Funding

This work was supported by the Engineering and Physical Sciences Research Council (EPSRC), UK (EP/I031707/1 and voucher 11220756) and by E.ON Technologies (Ratcliffe) Limited, UK.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Research Unit

  • Centre for Renewable Energy Systems Technology (CREST)

Published in

IET Generation, Transmission & Distribution

Pages

? - ? (21)

Citation

URQUHART, A.J. and THOMSON, M., 2015. Series impedance of distribution cables with sector-shaped conductors. IET Generation, Transmission & Distribution, 9(16), pp.2679-2685.

Publisher

© IET

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 International (CC BY 3.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by/3.0/

Publication date

2015

Notes

This paper was published as Open Access (CC BY 3.0) in the journal IET Generation, Transmission and Distribution. The dataset is at: https://dspace.lboro.ac.uk/2134/15544

ISBN

1751-8687

eISSN

1751-8695

Language

en

Licence

Exports

Logo branding

Categories

Keywords

Licence

Exports