Composite insulation mass decrements due to electric tensions influence

The composite insulation exposed to electric tension turns out to show mass decrements. The size of mass decrements depend on the level and duration of electric tension, on insulation surface conductivity and type of material. The process results in electric insulation surface changes. The relationship between the mass decrements and electric tension duration time proves to be similar to lime relationship of surface current leakage. Mass decrements in time function show either rapid exponential increase or get stabilized at the level that does not imperil the insulation durability, depending on the tension level and material type. The determination of mass decrement characteristics in function of insulation performance time is of great significance for prediction estimates of insulation durability.