雷击风机叶片的跃变击距特性与定量表征

doi:10.19595/j.cnki.1000-6753.tces.161964

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Abstract Lightning attachment to wind turbine blade is a key process of research about lightning protection of blades. An appropriate analysis of striking distance is beneficial for the lightning attachment research. Based on the physical mechanism of lightning attachment process, the distance between the heads of downward leader and connecting upward leader was defined as striking saltus distance. The influence of multiple upward leaders on lightning attachment and striking saltus distance was then analyzed. Considering the leader inception and propagation theory, a lightning attachment model of wind turbine blade was established according to equivalent model of downward leader and the judgement method of stable upward leader. Furthermore, a striking saltus distance equation was proposed using model and results show that the lightning parameters, such as lateral distance, have no effect on striking saltus distance. Experimental and observational results were used to verify the model. Moreover, a striking distance equation to ground was proposed considering the influence of upward leaders to the electric field. Comparative analysis indicates that the existing equations are maybe ineffective for lightning calculation of wind turbines.

Key words： Wind turbine blade striking saltus distance competition of multiple leaders striking distance to ground lightning attachment model

Received: 14 December 2016 Published: 18 August 2017

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TM614

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