Flashover Probability of Wind Turbine Blade and Impact of Strong Electromagnetic Pulse from Lightning Strikes on Wind Turbine Safety

This paper systematically studies the flashover probability of wind turbine blade lightning arrester and the impact of strong electromagnetic pulses on the local and surrounding wind turbines during lightning strikes.The research results indicate that the flashover probability of direct lightning strikes by the wind turbine blade lightning arrester is almost negligible,and the strong electromagnetic pulse of wind turbine blade during lightning strikes has a serious impact on the electronic equipment of the machine,while the impact on the surrounding wind turbine is relatively small.At the same time,the calculation formula for the reflection of lightning current on the carbon brush between the wind turbine hub and the engine compartment during the flashing of the wind turbine blades is provided,and the calculation method for calculating the spatial gradient distribution of electromagnetic field intensity using Biot-Savart Law theorem is applied.The limitations of using wind turbine blades for lightning protection are pointed out,and a technical route for achieving wind turbine lightning safety is proposed,which can be used as a reference for wind turbine lightning protection technicians.

Analysis of development situation and patent technology of catalyst wastewater treatment

The development situation and patent technology of Catalyst Wastewater Treatment are analyzed.Catalysts have a wide range of applications in industrial productions.However,wastewater produced during their pro‐duction has restricted the development of related enterprises.The state of the art,trends,and technological routes of patent technology of catalyst wastewater treatment is analyzed,using statistical analysis,relied upon China National Intellectual Property Administration’s Patent Search and Service System.It is provided a refer‐ence for the innovation of future catalyst wastewater treatment technology.