Electric Field Analysis and Structure Design of the Baffle of Bird Guard Used in 220 kV Transmission Line

Bird activities are easy to cause electrical faults of overhead transmission lines. As one of the main anti bird device, baffle of bird guard has been widely used in China. The performance of baffle of bird guard used in 220 kV transmission line are analyzed in this paper, with the establishment of finite element simulation model, the effects of the baffle of bird guard with different materials on the transmission line insulator electric field and potential distributions are studied. Besides, considering that some birds may build nests on the baffle of bird guard in practical applications, and part of the material to build bird's nest may fall off, which may lead to the discharge of the transmission line insulator, combined with the theory of air discharge and results of the simulation, the influence of external object approaching on the discharge of the insulator is studied, and a reasonable structure design scheme of the baffle of bird guard is put forward. The research results in this paper can provide a guidance for the selection and key parameters design of the baffle of bird guard.