Abstract: High-voltage transmission lines in power systems are frequently located in harsh natural environments. Regular inspection and maintenance of these lines is crucial. Automatic inspection and monitoring of transmission lines is becoming possible with the application of unmanned aerial vehicle(UAV) technology. However, UAV system is inevitably prone to fault. And the constant communication between the UAV and the ground station FD element will consume limited network resources. Given this, an event-triggered based FD scheme is designed. The decoupling of residual signals and event-triggered transmission errors is implemented by designing FD filters for the variable-sampling-period linear discrete-time model of high-voltage transmission line inspection UAVs. An experimental platform is used to simulate the effect of network transmission disturbances(packet loss, delay) with the help of MATLAB TrueTime toolbox. The results show that the method can realize the event-triggered FD for the transversal lateral system of inspection UAVs in the influence of network transmission interference.