... big blade pitch, start up with 2m/s wind speed;Wind turbine start to run: reduce blade pitch step by step ... will lose it aerodynamics, start mechanical brake to stop wind turbine.Functioanl scheme:Auto protection system: APS Systemauto protection system, ... over rated, protection system will stop wind turbine, when wind speed is suitable, it will release wind turbine again.Other products: Main market: ...