Application of Class B Earthing Switch Switching Induced Current in Gezhouba Hydropower Station

The paper summarizes the operation mode of earthing switch switching induced current and presents the mechanism of electrostatic and electromagnetic induction in common-tower double-circuit lines.Introduces the selection of class B earthing switch in Gezhouba Hydropower Station,explains the working principle of class B earthing switch of AREVA and that need to pay great attention to installation and adjustment.According to installation operation condition,the suggestions are as follows,the structure should be optimized so that it can be installed in either side of disconnector,add display unit of SF6 gas pressure and etc.