Simulation of positive streamer propagation in an air gap with a GFRP composite barrier

High voltage

article

Hengxin He¹  Dezhi Xia¹  Bin Luo¹  Weijiang Chen²  Kai Bian²  NianWen Xiang³ 

[1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology;State Grid Corporation of China;School of Electrical Engineering and Automation, Hefei University of Technology

关键词: air gaps;    blades;    discharges (electric);    glass fibre reinforced plastics;    laminates;    numerical analysis;    permittivity;    space charge;    wind turbines;   

DOI  :  10.1049/hve2.12112

学科分类：物理（综合）

来源: Wiley

【 摘 要 】

The puncture of glass fibre reinforced polymer (GFRP) laminate is a primary damage pattern of wind turbine blades due to lightning strikes. A numerical simulation model of positive streamer propagation in a needle-to-plate air gap with a GFRP laminate is established to investigate the breakdown mechanism of GFRP laminate. The model not only considers the dynamics of charged particles in the air and the composite laminate, but also the current continuity at gas–solid interfaces. The simulated streamer discharge pattern and the surface streamer length are in good agreement with the observation results. The distributions and evolutions of the electron number density, electric field, and surface charge densities during streamer propagation are obtained. It is found that the enhancement of the electric field on the GFRP laminate is caused by the rapid deposition of positive and negative space charges on the GFRP laminate after a secondary streamer incepts on the lower surface of the GFRP laminate. The effects of the applied voltage, relative permittivity, and thickness of the GFRP laminate on the electric field on the GFRP laminate are investigated. The obtained results could assist in further understanding of the mechanism of GFRP wind blade breakdown due to lightning strikes.

【 授权许可】

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