Estimation of the electric fields and dielectric breakdown in non‐conductive wind turbine blades subjected to a lightning stepped leader

In this paper, the electric fields in the wind turbine blades due to the lightning stepped leader are studied, and the dielectric breakdown is assessed. The developed finite element analysis (FEA) includes the full length of the leader and enables one to incorporate various uniform and non-uniform charge density models. The lightning striking distance is calculated using the rolling sphere method. The electric field in a horizontal axis wind turbine with three blades representing Sandia 100 m All-glass Baseline Wind Turbine Blades (SNL 100-00) at three different lightning protection levels (LPL) is computed and compared to the dielectric breakdown strength of the blades. The dielectric breakdown strength of the blades is evaluated based on the experimental data. The results show that the tip region of the blade is the most vulnerable to the dielectric breakdown with the safety factor as low as 1.32 at LPL I. Copyright © 2016 John Wiley & Sons, Ltd.

[1]  R. Thottappillil,et al.  Characteristics of upward positive lightning flashes initiated from the Gaisberg Tower , 2012 .

[2]  M. Hooker,et al.  Moisture Degradation of Cyanate Ester/S2 Glass Composite Insulation Systems , 2010 .

[3]  Akira Todoroki,et al.  Artificial lightning testing on graphite/epoxy composite laminate , 2010 .

[4]  Walter Musial,et al.  Trends in the Design, Manufacture and Evaluation of Wind Turbine Blades , 2003 .

[5]  F. D'alessandro,et al.  Field study on the interception efficiency of lightning protection systems and comparison with models , 2006, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[6]  Mark A. Miller,et al.  Damage resistance and tolerance of carbon/epoxy composite coupons subjected to simulated lightning strike , 2009 .

[7]  Wang Xiaohui,et al.  Calculation of electromagnetic induction inside a wind turbine tower struck by lightning , 2010 .

[8]  A. J. Eriksson.  The Incidence of Lightning Strikes to Power Lines , 1987, IEEE Transactions on Power Delivery.

[9]  V. Rakov,et al.  The lightning striking distance—Revisited , 2007 .

[10]  Nicholas Jenkins,et al.  Lightning protection for wind turbine blades and bearings , 2001 .

[11]  S. Larigaldie.  Spark propagation mechanisms in ambient air at the surface of a charged dielectric. I: Experimental ― the main stages of the discharge , 1987 .

[12]  T. Sørensen,et al.  Interaction between Electrical Discharges and Materials for Wind Turbine Blades - particularly related to lightning protection , 2007 .

[13]  Vladimir A. Rakov,et al.  The Physics of Lightning , 2013, Surveys in Geophysics.

[14]  M. Becerra.  On the Attachment of Lightning Flashes to Grounded Structures , 2008 .

[15]  Andrew John. Eriksson.  The lightning ground flash : an engineering study. , 1979 .

[16]  S. Report,et al.  The Sandia 100-meter All-glass Baseline Wind Turbine Blade: SNL100-00 , 2011 .

[17]  Olesya I. Zhupanska,et al.  Lightning strike thermal damage model for glass fiber reinforced polymer matrix composites and its application to wind turbine blades , 2015 .

[18]  Renfu Li,et al.  Experimental study of damage characteristics of carbon woven fabric/epoxy laminates subjected to lightning strike , 2015 .

[19]  R. H. Golde.  The Frequency of Occurrence and the Distribution of Lightning Flashes to Transmission Lines , 1945, Transactions of the American Institute of Electrical Engineers.

[20]  O. Lesaint,et al.  Water absorption in a glass-mica-epoxy composite - [I: Influence on Electrical Properties] , 2009, IEEE Transactions on Dielectrics and Electrical Insulation.

[22]  S. Larigaldie,et al.  Mechanisms of high‐current pulses in lightning and long‐spark stepped leaders , 1992 .

[23]  J. Moreau,et al.  Lightning leader laboratory simulation by means of rectilinear surface discharges , 1981 .