Insulation Coordination between wind turbine blade LPS components when submitted to subsequent negative short stroke

Abstract:
Modern wind turbine blades have typical lengths exceeding 100 meters. These blades have a beam made of carbon, which is then integrated into the blade Lightning Protection System (LPS). One important design aspect is the number and position of equipotential bonds (EB) between the very long parallel conductors that a blade has. The spacing be-tween these EB is related to the voltage difference between these conductors. Calculation of the insulation voltage be-comes more difficult for subsequent negative short stroke, which present very high current derivatives. The paper focuses on describing a new method for the analysis of the insulation voltage between blade conductors when submitted to subsequent negative short strokes. The method analysis the insulation voltage from a dynamical perspective, due to the short duration of the voltage difference derived from the subsequent negative short strokes.