Abstract
Room-temperature vulcanizing (RTV) silicone rubber is used as a high-voltage insulator coating to enhance the pollution performance of conventional insulators, and the electrical performance of RTV coating depends on the several parameters. The present study shows the effects of the thickness on the leakage current, erosion, and hydrophobic performance of high-voltage insulator coating. Several different thicknesses of RTV silicone rubber were taken into consideration on porcelain substrates. Erosion and leakage current performances of the samples were evaluated by using inclined-plane tests (IPTs) based on the IEC 60587 standard. Eroded masses and fundamental and harmonic components of the leakage currents were investigated with respect to coating thicknesses. On the other hand, hydrophobic features of the samples were evaluated by using dynamic drop tests (DDTs) with regard to CIGRE TB442 documentation. Time to loss of hydrophobicity and the level of the leakage currents were investigated in DDTs considering the thicknesses.
Highlights
Pollution is one of the main issues affecting the electrical performance of high-voltage outdoor insulation systems that operate close to industrial areas as well as coastal regions
Erosion and dynamic hydrophobicity performances of the coatings with respect to coating thicknesses were not evaluated in inclined-plane tests (IPTs) and dynamic drop tests (DDTs), respectively
In addition to leakage current and erosion, the hydrophobicity performance of the coatings of different thicknesses was evaluated by using DDTs in accordance with CIGRE TB442 documentation [14]
Summary
Pollution is one of the main issues affecting the electrical performance of high-voltage outdoor insulation systems that operate close to industrial areas as well as coastal regions. Replacing the conventional insulators by silicone rubber (polymeric) insulators and applying high-voltage insulator coating to the conventional insulators, such as porcelain and glass ones, are the main solutions to overcome the pollution-related problems [2, 4, 5]. The dynamic drop test (DDT) has been shown to be an appropriate test method to evaluate the dynamic hydrophobic properties of high-voltage insulating materials when subjected to pollution-initiated microdischarges [13]. Electrical performances of RTV coating with respect to the coating thicknesses were evaluated by using salt-fog tests [9, 10]. Erosion and dynamic hydrophobicity performances of the coatings with respect to coating thicknesses were not evaluated in IPTs and DDTs, respectively. Time-to-hydrophobicity loss of the samples was evaluated with a DDT, which was not used before to evaluate RTV-coated samples
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