RTV Coatings on Ceramic Insulators and composite insulator
Home » News » Technical Service » RTV Coatings on Ceramic Insulators and composite insulator

RTV Coatings on Ceramic Insulators and composite insulator

Views: 0     Author: Site Editor     Publish Time: 2022-07-08      Origin: Site

Inquire

facebook sharing button
twitter sharing button
line sharing button
wechat sharing button
linkedin sharing button
pinterest sharing button
whatsapp sharing button
sharethis sharing button

Different types of insulators with hydrophobic properties have now become commercially available, including composite insulators, hybrid insulators and silicone greased ceramic insulators. One variant of rapidly growing interest and application worldwide involves coated insulators obtained by applying a uniform thin layer of Room Temperature Vulcanizing silicone rubber material along a ceramic insulator’s surface. Coated ceramic insulators offer the advantage of a surface with the desirable characteristics of a hydrophobicity transfer material to provide improved withstand voltage capability under pollution coupled with the known mechanical robustness and strength of the underlying ceramic.

RTV silicone is a liquid polymer that vulcanizes when exposed to moisture in air. By all accounts, there can be considerable variation in the electrical and physical properties of different commercially available coatings. Such variations depend on factors including but not limited to the relative amounts of reinforcing fillers in the coating, curing components that affect the degree of cross-linkage in the polymer and primers for improving adhesion to the insulator surface. Optimal coating thickness can be yet another variable among different suppliers.

Fig. 2: Characterization of a particular formulation of RTV coating using Fourier Transform Infrared spectroscopy.

Silicone polymers and moulded components made with silicone elastomers exhibit low surface energy that does not allow water to spread out over the surface. These elastomeric formulations contain a small but not negligible amount of low molecular weight siloxane chains that continually migrate to the surface – a phenomenon that not only promotes sustained hydrophobicity even in presence of pollution but that also encapsulates the pollution layer. RTV coatings can be used on both station insulators and line insulators and can be applied to an insulator either wholly or partially using spraying or dipping.

RTV-coatings


Most early applications of RTV silicone coatings were conducted on-site as a remedial measure to mitigate pollution flashovers on insulators and bushings that demonstrated poor service performance. On-site coating, whether manual or robotized, is still is the most commonly used practice for station insulators. However, in the case of line insulators coating application in situ can be challenging due to challenging working conditions and because of the difficulty in applying the coating evenly. As a result, there has been growing interest to adopt factory pre-coated cap & pin string insulators as one of the possible solutions adopted during the design phase of a new line project.


This article is copy from INMR (https://www.inmr.com),Not for commercial use, only for technical learning and communication.

Table of Content list

Related Products

content is empty!

RELATED NEWS

content is empty!

PRODUCT

QUICK LINKS

CONTACT US

Email:  jonsonchai@chinahaivo.com

             sales@chinahaivo.com

             54442019@qq.com

Wechat:+86 13587716869

WhatsApp:+86 13587716869

Tel:       0086-577-62836929

              0086-577-62836926

              0086-13587716869

              0086-15957720101

Get Touch With Us

Contact us

If you have any questions, you can contact us through the form.

Copyright © 2020 Haivo Electrical Co.,Ltd Support  by  leadong.com   Sitemap  |  Privacy Policy