The Effect Of Overvoltage On Moisture-damaged Insulators

In power systems, the role of dead end insulators is crucial, as it ensures a stable flow of current and prevents unnecessary power loss. When dead end suspension insulators gets damp, its performance will be severely affected. If an overvoltage is applied to this damp polymer deadend insulator, it could cause various problems.

The electrical properties of damp insulators deteriorate

Damp insulators will experience a significant decrease in their electrical insulation performance due to the presence of moisture. When an overvoltage is applied to this type of porcelain dead end insulators, moisture can accelerate current leakage and may even lead to the generation of an electric arc. This phenomenon not only significantly reduces the withstand voltage of the suspension insulator, but may also cause local overheating, leading to damage or complete failure of the suspension composite insulator. When electrical equipment operates in this environment, serious consequences such as electrical short circuits and equipment burnout often occur.

Risk of Insulator Failure in Humid Environments

Damp insulators cannot provide adequate protection, especially under severe overvoltage conditions. Under overvoltage conditions, the presence of moisture and water causes a significant decrease in the surface resistance of the insulator, making it unable to effectively suppress excessive current conduction. When exposed to this environment for a long time, the insulator will gradually degrade and lose its insulating function. Power equipment may experience power outages, equipment damage, or even pose a serious threat to the safety of the power grid.