Observation of an upward lightning flash with 21 upward positive leaders initiated from different wind turbines in wind farm

As the wind turbine height increases, probability of multiple upward leaders flashes within farm increases. In this study, an lightning flash containing 21 positive (UPLs) initiated from different turbines in Zhangbei Wind Farm was analysed. The average speed UPLs 1.2 × 105 m/s, which mostly decreased to zero before reaching cloud height. Only four developed height, with prolonged periods bright light on three them and a minimum duration 126 ms. A total nine return strokes occurred other two dissipated leader channels, numbers channels six three, respectively. interstroke interval for 10.5 Most these had peak currents smaller than 10 kA. high-speed video frames confirmed that competition does exist between UPLs, range shielding effects increases as ULs effect fan rotation initiation are discussed.