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Series impedance of distribution cables with sector-shaped conductors
journal contribution
posted on 2015-08-17, 10:44 authored by Andrew J. Urquhart, Murray ThomsonMurray ThomsonModels 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.
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 & DistributionPages
? - ? (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
© IETVersion
- 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
2015Notes
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/2134/15544ISBN
1751-8687eISSN
1751-8695Publisher version
Language
- en
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