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Estimation of Contact Resistivity in Lightning Protection Equipotential Bonding Joints of Wind Turbine Blades

Estimation of Contact Resistivity in Lightning Protection Equipotential Bonding Joints of Wind Turbine Blades
Estimation of Contact Resistivity in Lightning Protection Equipotential Bonding Joints of Wind Turbine Blades
Modern lightning protection systems for wind turbine blades with conducting structural elements, e.g., carbon fibre reinforced polymer (CFRP) spar caps, contain equipotential bonding joints to prevent sparking during strikes. Significant current levels are experienced through the joints and the characterization of the electrical contact at the bonding regions is essential for reliable protection. Therefore, this article aims to characterize the contact resistivity of several equipotential bonding joints. The proposed methodology first measures the total resistance of the samples, and then the bulk resistance of the
conductive elements is computed using the finite-element method.
The latter is required to predict the spreading effects in CFRP components due to the strong anisotropic nature of such materials. After that, the contact resistance is calculated by subtracting the predicted bulk resistances from the measured total resistances. The developed procedure was applied to three typical
equipotential bonding materials: expanded copper foil (ECF), biaxial (BIAX) CFRP and unidirectional (UD) CFRP. Both ECF and BIAX CFRP showed superior contact quality than UD CFRP, with one to two orders of magnitude smaller contact resistivity
Contact resistivity, Lightning Protection, equipotential bonding (EB), finite-element method (FEM), wind turbine blades
0018-9375
1163-1178
Laudani, Antonio, Andrea Maria
c88d7c66-06cd-4c5f-a978-df1d9ac16403
Senis, Evangelos
dacb2db8-e3cc-444f-8acf-db881eb99a54
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Golosnoy, Igor O.
40603f91-7488-49ea-830f-24dd930573d1
Kremer, Jochen
2518dc37-54ea-4dbf-b07b-d87e2c22bcc2
Klein, Hendrik
3a7dab83-e20f-4b49-8dfb-f6e22e91db47
Thomsen, Ole
f3e60b22-a09f-4d58-90da-d58e37d68047
Laudani, Antonio, Andrea Maria
c88d7c66-06cd-4c5f-a978-df1d9ac16403
Senis, Evangelos
dacb2db8-e3cc-444f-8acf-db881eb99a54
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Golosnoy, Igor O.
40603f91-7488-49ea-830f-24dd930573d1
Kremer, Jochen
2518dc37-54ea-4dbf-b07b-d87e2c22bcc2
Klein, Hendrik
3a7dab83-e20f-4b49-8dfb-f6e22e91db47
Thomsen, Ole
f3e60b22-a09f-4d58-90da-d58e37d68047

Laudani, Antonio, Andrea Maria, Senis, Evangelos, Lewin, Paul, Golosnoy, Igor O., Kremer, Jochen, Klein, Hendrik and Thomsen, Ole (2021) Estimation of Contact Resistivity in Lightning Protection Equipotential Bonding Joints of Wind Turbine Blades. IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, 63 (4), 1163-1178, [9374673]. (doi:10.1109/TEMC.2021.3059365).

Record type: Article

Abstract

Modern lightning protection systems for wind turbine blades with conducting structural elements, e.g., carbon fibre reinforced polymer (CFRP) spar caps, contain equipotential bonding joints to prevent sparking during strikes. Significant current levels are experienced through the joints and the characterization of the electrical contact at the bonding regions is essential for reliable protection. Therefore, this article aims to characterize the contact resistivity of several equipotential bonding joints. The proposed methodology first measures the total resistance of the samples, and then the bulk resistance of the
conductive elements is computed using the finite-element method.
The latter is required to predict the spreading effects in CFRP components due to the strong anisotropic nature of such materials. After that, the contact resistance is calculated by subtracting the predicted bulk resistances from the measured total resistances. The developed procedure was applied to three typical
equipotential bonding materials: expanded copper foil (ECF), biaxial (BIAX) CFRP and unidirectional (UD) CFRP. Both ECF and BIAX CFRP showed superior contact quality than UD CFRP, with one to two orders of magnitude smaller contact resistivity

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Estimation of Contact Resistivity in Lightning Protection Equipotential Bonding Joints of Wind Turbine Blades - Accepted Manuscript
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Accepted/In Press date: 10 February 2021
Published date: 10 March 2021
Keywords: Contact resistivity, Lightning Protection, equipotential bonding (EB), finite-element method (FEM), wind turbine blades

Identifiers

Local EPrints ID: 448730
URI: http://eprints.soton.ac.uk/id/eprint/448730
ISSN: 0018-9375
PURE UUID: 28ae3409-b874-462b-8036-757c023b5e32
ORCID for Evangelos Senis: ORCID iD orcid.org/0000-0002-7500-2778

Catalogue record

Date deposited: 04 May 2021 16:37
Last modified: 24 Aug 2021 17:01

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Contributors

Author: Antonio, Andrea Maria Laudani
Author: Evangelos Senis ORCID iD
Author: Paul Lewin
Author: Igor O. Golosnoy
Author: Jochen Kremer
Author: Hendrik Klein
Author: Ole Thomsen

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