1. Faults caused by lightning strikes or external forces
According to statistics, in general insulator faults on transmission lines, the faults caused by lightning strikes account for 50% to 55% of the total.
2. Failure caused by pollution
In the natural environment, affected by sulfur dioxide, nitrogen oxides, and particulate dust, a layer of dirt is deposited on the surface of the insulator.
3. Failure caused by bird damage
Bird excrement affects the insulation effect.
4. Failure caused by aging
5. Failure caused by low resistance
The insulation strength of one or several pieces of the insulator string is reduced.
6. Failure caused by overvoltage
Common faults of insulators
1) Poor product quality. Due to moisture absorption in the rainy season, the insulation performance of the insulator is low, and flashover breakdown or thermal expansion and explosion of the insulator occurs, resulting in explosion, and finally the insulator loses its insulation.
2) Improper construction damages the insulator. Due to external forces, the insulators are cracked, damaged or lack of glaze, which can cause flashover and breakdown in rainy weather.
3) The insulator is aging. Due to long-term mechanical and electrical loads and changes in the external environment, the insulation performance of the insulator is reduced, and the insulation performance is eventually lost.
4) Flashover burns. Reduce the insulation performance and cause breakdown after long-term operation.
5) Lightning overvoltage. Make the insulator flashover and burn.
6) Pollution flash. Contamination on the surface of the insulator reaches a certain level, causing flashover or creeping discharge.
Post time: Oct-09-2021