Effects of liquids immersion and drying on the surface properties of HTV silicone rubber: characterisation by contact angle and surface physical morphology

High Voltage

¹  Yanfeng Gao²  Yuanji Cai³  Xidong Liang³  Chao Wu³  Shaohua Li³  Yingyan Liu³  Weining Bao³ 

[1] ;State Grid Jibei Electric Power Co. Ltd, Research Institute, North China Electric Power Research Institute Co. Ltd;State Key Lab of Power System, Tsinghua University;

关键词: fractals;    discrete wavelet transforms;    ageing;    hydrophobicity;    vulcanisation;    drying;    silicone rubber insulators;    diffusion;    composite insulators;    contact angle;    surface morphology;    signal resolution;    surface properties;    high-temperature vulcanised silicone rubber composite insulator;    ultra-high transmission lines;    mechanical performance;    contact angle measurement;    surface physical morphology measurement;    HTV silicone rubber surface;    electrical performance;    liquid immersion effects;    liquid drying effect;    extra-high transmission lines;    discrete wavelet transform method;    multiresolution signal decomposition algorithm;    three-dimensional fractal dimension calculation;    hydrophobicity recovery;    loss mechanism;    drying processes;    embedded water molecules;    roughness-fractal dimension;    electrical stresses;    environmental stresses;    low molecular weight siloxane diffusion;   

DOI  :  10.1049/hve.2018.5071

来源: DOAJ

【 摘 要 】

High-temperature vulcanised (HTV) silicone rubber composite insulator has been widely used in extra-high and ultra-high transmission lines due to its excellent electrical and mechanical performance. In practice use, liquids may encounter the composite insulator intermittently and can lead to the degradation and deterioration of silicone rubber. In the present research, the effects of liquids immersion and subsequent drying on the surface properties of HTV silicone rubber were investigated by means of the contact angle measurement and surface physical morphology measurement which was further analysed in terms of the discrete wavelet transform method, multiresolution signal decomposition algorithm, and three-dimensional fractal dimension calculation. Based on the experimental results, the mechanism of the loss and recovery of the hydrophobicity of HTV silicone rubber surface during the liquids immersion and subsequent drying processes were further explained by taking into consideration the embedded water molecules (and/or hydrated ions) on the HTV silicone rubber surface and the synergy of the increase in roughness/fractal dimension and low molecular weight siloxanes diffusion. This study is helpful for better understanding of the change of surface properties of HTV silicone rubber caused by environmental and electrical stresses.

【 授权许可】

Unknown