Study on Bird Dropping Flashover Prevention Characteristics of AC Line in Areas Above 4000 m

Mastering the bird dropping flashover characteristics of AC transmission line tower clearance in areas above 4,000 m and taking reasonable measures to prevent bird dropping fault are the key to ensure the safe and stable operation of transmission lines in high-altitude areas. For V and I insulator strings of 500 kV line and I insulator strings of 330 kV line commonly used in high-altitude areas, the bird dropping flashover discharge test was carried out under rated operating voltage and highest operating voltage respectively, and flashover probability at different falling positions of bird droppings was obtained. The easy flashover scope of bird droppings on both sides of 3.5 m and 3.0 m of V and I insulator strings of 500 kV line and 2.0 m of I insulator strings of 330 kV line is determined. According to the structural characteristics of tangent towers and tension towers on AC line, the layout scope and measures of bird thorn and thorn plate are put forward. The research results can provide a basis for the bird dropping flashover prevention fault of AC transmission lines in areas above 4,000 m.