The Influence Of Highly Polluted Environments On The Activation Of Salt Dense Deposition In Insulators

In the operating environment of power transmission lines, suspension composite insulator is exposed to pollutants and salts in the atmosphere for extended periods. Through changes in wind and humidity, these particles gradually accumulate on the surface of composite suspension insulator, forming a salt-dense deposition layer. Over time, in high-humidity and maritime climates, the salts transform into a conductive medium through wetting, causing significant changes in the surface's electrical properties.

When a salt-dense deposit layer is present, the leakage current characteristics of the polymer suspension insulator surface will change. This deposit dissolves in the water film formed by moist air or dew, increasing the surface conductivity, causing local electric field distortion and accelerating the flow of current along the surface. This phenomenon may lead to partial discharge activity in actual operation, which in turn has an adverse effect on the insulation withstand voltage characteristics.

Salt-dense deposition depends not only on the pollutants themselves but also on meteorological factors such as temperature and relative humidity. Under high humidity conditions, salt solubility increases, and ion migration in the microscopic water film becomes more significant, resulting in multiple leakage paths on the suspension type insulator surface. In this environment, the conductivity of the deposition layer increases over time, and the tendency for surface flashover also increases.