The characteristic of silicon rubber insulators contaminated with concrete

Concrete-polluted silicone rubber (SIR) insulators are common nature-polluted insulators. A type of concrete-polluted SIR insulators with different content of concrete was evaluated. The flashover voltage of concrete-polluted insulators was tested after placing in artificial climatic chamber for 6 hours with ultrasonic fog device continual working. The incepted discharge area always occurs at the umbrella edge and the connected area of the hardware fittings and core rod for light concrete-polluted SIR insulators. However, the incepted discharge area always occurs at connected place of core rod and hardware fitting for heavy concrete-polluted one. The flashover voltage decreases with the increase of concrete content by a power function and the influence factor of the concrete deposit density b is 0.194. Even though after a long time transfer, the hydrophobicity of heavy concrete-polluted SIR insulators also decrease with the increase of concrete-polluted content.