A Study of Correlation between Hydrophobicity and Partial Discharge in Silicone Rubber Insulators

• Main Authors: Jen-Chung, Chang, 張振昌
• Other Authors: Ruay-Nan, Wu
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/62683246461936904034

碩士 === 國立臺灣科技大學 === 電機工程系 === 93 === At present, silicone rubber insulators are likely reliable for outdoors power system applications in the world due to their better pollution withstand performance and aging withstand capability, especially the hydrophobicity of recovery. The goal of this study is to investigate the correlation between hydrophobicity and partial discharge of silicone rubber insulators. In the aging experiment, three samples of silicone rubber insulators were used. The aging process is to dip the samples in the salted water with different conductivity and then to stress them by A.C high-voltage. There are two stages of ten aging cycles each in this aging experiment. The time of dipping in salted water and the applied voltage magnitude are different for these two stages so as to observe the variation of hydrophobicity of silicone rubber insulators in terms of its discharge phenomenon during the aging process. The determination of hydrophobicity is based on IEC TS 62073－the spray method. The experimental results show that hydrophobicity aging process is highly related to the surface discharge and the time of dipping rather than the conductivity of salted water. Above all, similar to the related literatures, the thesis divides the ageing into three stages, the early ageing period, the transition period and the late ageing period. And, the relationship between hydrophobicity and partial discharge in each stage is then illustrated. Finally, the characteristics of corona discharges and dry-band arcing discharges are studied to verify its relation to the ageing of hydrophobicity. The results of the study shall be of value to the subsequent researches for on-line detecting of polymeric insulators in service.