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External insulation optimization for 110 kV drain wires in bird-hazard scenarios: effects of structural parameters on field distortion and flashover
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DOI：10.1016/j.epsr.2026.113042.png)
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Abstract
En 中文
Bird damage has become a major factor affecting the stable operation of transmission line feeders. Bird nesting, droppings, and short circuits can easily trigger flashover faults in feeders, leading not only to line tripping but also equipment damage and power outages. This study investigates the flashover protection characteristics of a novel silicone rubber-insulated jumper wire deployed on a 110 kV transmission line when subjected to simulated bird-dropping contamination. Combining finite element simulation analysis and simulated bird droppings experiments, the effects of different insulation layer thicknesses, bird droppings conductivity, viscosity, and drip diameter on the electric field distribution and flashover probability are investigated. Simulation results show that as the drip distance of bird droppings increases, the difference in electric field strength among different insulation combinations gradually decreases. In the critical region (0 similar to 200mm) where bird droppings approach the feeder, the insulation combination of a 6.5mm silicone rubber layer/1mm shield layer exhibits better insulation performance due to its lower electric field strength. Simulation experiments further verified that the flashover probability increases with the increase of bird droppings conductivity and viscosity. Compared with bare conductors, the novel insulated drain wire significantly reduced the flashover probability when the droplet diameter exceeded 6 mm, demonstrating good flashover protection performance. This research provides a theoretical basis for optimizing the insulation structure and bird-damage prevention design of drain wires.
Keywords:
Silicone rubber
Drain wire
Bird droppings flashover
Power transmission line
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4.2
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1.1W
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