1. High-voltage operation permit: A high-voltage operation permit is required for the operation, maintenance, installation, overhaul, renovation, construction, commissioning and test of high-voltage electrical equipment (power transmission and transformation lines in wind farm stations are generally 35KV or above) of 1 kV or above;
2. Low-voltage operation permit: Low-voltage operation permit is required for the installation, commissioning, operation, maintenance, overhaul, transformation and test of low-voltage electrical equipment (fan box change and secondary line protection in the station) below 1 kV;
3. Permit for aerial work: It is necessary to apply for an aerial work permit when working at a height datum of 2 meters or more (the tower of the fan exceeds 70 meters) and there is a possibility of falling.