The study about indefinite fault causes in Estonian 110 kV power grid

The study examines the cause of indefinite flashovers in the Estonian 110 kV power grid. The number of indefinite flashovers has increased significantly in last years causing a lot of problems to the TSO. Concluding the study one can argue that most of indefinite faults in power grid are in high probability caused by the wildlife, more specifically birds. Main “cause” could in high probability be migrating bird called White Stork.