Protection of large wind turbine blades against lightning
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Document typeConference report
Defense date2008
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Abstract
Lightning protection of modern wind turbines presents a number of new challenges due to the geometrical,
electrical and mechanical particularities of the turbines. The risk assessment requires the estimation of the number of
expected strikes. In the case of modern turbines, most of the expected lightning flashes will be upward. In addition, due to
the rotation of the blades, modern wind turbines may trigger their own lightning. Moreover, since wind turbines are
becoming tall structures, lightning currents that are injected by return strokes into the turbines may be affected by the
structure itself. The presence of carbon reinforced plastics in the blades introduces a new set of problems. The validation of
lightning protection systems for wind-turbine blades is therefore an important issue. This paper presents some open
questions related to lightning protection of large wind turbines. The paper also presents two full-scale blade impulse
current tests that allow the evaluatation of current distributions and potential differences for the first and second return
stroke currents defined in the corresponding IEC standards.
CitationMontaña, J. [et al.]. Protection of large wind turbine blades against lightning. A: 29th International Conference on Lightning Protection. "29th International Conference on Lightning Protection". Uppsala: 2008.
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