DC-toughened glass insulators pre-coated with RTV silicone rubber — Field returns from aged samples installed on HVDC lines

Author

Marzinotto, M. ; Lavecchia, G. ; Guarniere, M.R. ; Posati, A. ; Rebolini, M. ; George, J.-M. ; Prat, S.

Author_Institution

Terna Rete Italia-TERNA Group, Roma, Italy

fYear

2013

fDate

June 30 2013-July 4 2013

Firstpage

170

Lastpage

173

Abstract

RTV silicone rubber coating on ceramic insulators has been used for at least two decades in order to solve critical problems related to pollution in harsh environments. In Italy the experience on AC 380 kV transmission lines started ten years ago; today this kind of insulators is considered as an attractive solution to solve problems of flashovers in highly polluted areas. Recently a trial installation started on HVDC Terna´s lines. The first tests performed on an insulator string sampled after more than 2 years have shown that RTV pre-coated insulators seem to be a valid alternative to ceramic insulators in highly polluted environment even if further investigations are needed in order to better understand their behavior under DC stress.

Keywords

HVDC power transmission; ceramics; coating techniques; glass; insulators; power transmission lines; silicones; AC transmission lines; DC stress; DC-toughened glass insulator; HVDC Terna lines; HVDC lines; RTV precoated insulators; RTV silicone rubber coating; ceramic insulators; flashovers; insulator string; voltage 380 kV; Coatings; Glass; Pollution; Pollution measurement; Rubber; Surface contamination; HVDC lines; RTV coating; field experience; insulators; unified specific creepage distance;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid Dielectrics (ICSD), 2013 IEEE International Conference on

Conference_Location

Bologna

ISSN

2159-1687

Print_ISBN

978-1-4799-0807-3

Type

conf

DOI

10.1109/ICSD.2013.6619772

Filename

6619772