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Comparative assessment of enhancements to wind turbine earthing systems

El-Mghairbi, A, Griffiths, Huw, Harid, N and Haddad, Abderrahmane 2014. Comparative assessment of enhancements to wind turbine earthing systems. IEEJ Transactions on Power and Energy 134 (7) , pp. 562-567. 10.1541/ieejpes.134.562

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Abstract

In this paper, earthing system models for wind turbines are developed under variable frequency and transient conditions. Under high frequency and high resistivity, a fall in the earth potential rise occurs which suggests a strong capacitive effect at these frequencies. For on-shore windfarms, it was found that earthing interconnection of adjacent wind turbine structures is beneficial in reducing transient earth potential rise (TEPR) under impulse conditions. For the on-shore scenario, the benefits of interconnection extend to at least three turbines either side of the struck turbine. However, in an off-shore environment, the benefits of interconnection are less significant due to the low resistivity of the water which limits the effective length to less than that of a typical inter-turbine spacing. It was established that, for high frequency and transient conditions, the magnitude of the potential rise, seen from the point of injection, is significantly higher when the above-ground structure is taken into account. More importantly, the transient earth potential rise at the turbine base is also higher when the model includes the above-ground structure. Enhancements to the wind turbine earthing system are introduced using an insulated conductor in parallel with bare horizontal earth.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Uncontrolled Keywords: windfarm, earthing, grounding, impulse response, frequency response
Publisher: Institute of Electrical Engineers of Japan
ISSN: 0385-4213
Last Modified: 11 Oct 2017 00:22
URI: http://orca.cf.ac.uk/id/eprint/103027

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