![]() ![]() The surface can also be used to solve the problem of uneven field distribution due to surface water film and electric field enhancement due to water droplets. A super-hydrophobic silicone rubber shows an excellent water repellency property when water droplets impact it under electric field. The micro-nano structured HTV silicone rubber samples yielded the highest static contact angle,153.3°, and a very low sliding angle of 2.7°. Nano-structured HTV silicone rubber surfaces offered a static contact angle of 148.2° and a sliding angle of 4.9°. In the case of micro structured HTV silicone rubber surfaces, this increased to 151.1 ± 1.7°, while with sliding angle to 4.1°. The static contact angle of water drops on the unaltered HTV silicone rubber sample was 115 ± 0.7° (i.e. 3 shows the results of static contact angle and sliding angle measurements on HTV silicone rubber surfaces with different micro, nano, and micro-nano hierarchically textured surfaces. (a) contact angle and sliding angle (b) contact angle of HTV specimen with micro-nano structure (c) air pockets between water and HTV specimen with micro-nano structure.įig. 3: Contact angle and sliding angle of the original and super-hydrophobic HTV specimens. (a) original HTV silicone rubber surface, top left (b) nano-structure HTV silicone rubber surface, bottom left (c, d) micro-structure HTV silicone rubber surface, top right (e, f) micro-nano-structure HTV silicone rubber surface, bottom right.įig. 2: Scanning electron microscope (SEM) of original & super-hydrophobic HTV silicone rubber specimens. ![]() For example, Tsinghua University used a laser-ablated template and fluoroalkyl-silane-modified composite coatings to prepare a specific microstructure and nanostructure on a silicone rubber surface (see Fig. New super-hydrophobic materials are especially attractive for outdoor insulation and researchers have come up with various methods to create these. This article will focus on the discussion of new material & maintenance techniques. 1: Key issues for continued development of composite insulators. 1) will depend on: availability of suitable test methods to verify long-term performance establishing different requirements when it comes to station insulators and developing the best materials and maintenance techniques.įig. That means future development of composite insulators (as shown in Fig. Still, given the rapid development of this technology, the key issue for the future of composite insulators is that power utilities remain confident in their expected service life and performance. Moreover, major improvement has been achieved both in their manufacture and testing. Because of advantages in regard to superior wet and pollution flashover performance, light weight, high strength to weight ratio, easier transport and installation, resistance to vandalism, etc., application of silicone rubber composite insulators in China realized significant growth.Ĭomposite insulators also realized significant increase in usage worldwide and, based on trial applications, now dominate all UHV lines. For example, rapid growth in length of overhead lines and the move to higher voltage levels brought not only a huge increase in demand for insulators but also new and greater requirements in terms of their performance. It proposes that current IEC test methods and technical standards are insufficient and in need of important modifications.ĭevelopment of insulators cannot be viewed separately from development of the power sector as a whole. LIANG Xidong, and YAN Zhipeng of Tsinghua University in Beijing, explores key issues in this regard. This edited article, contributed to INMR by world-renowned expert, Prof. Key Issues for Continued Development of Composite Insulatorsīy: New Material & Maintenance Techniques RD:Īpplication of silicone rubber composite insulators has increased significantly over the past 30 years and among the essential factors behind continued growth is the confidence shown in them by power utilities. ![]()
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