RTV coating for substation

High  voltage  insulators  have  to  be  used  as  insulating supporters  in  various  environments  in  polluted  area.  The electrical  performance  of  insulators  will  be  degraded.  The polluted insulators will have over withstand voltage, flashover can occur easily when the air becomes wet by humidity or fog, which affects on the reliability of the power systems. In order to define effective counter measures against pollution flashovers  there  are  conventional  methods  such  as periodically water washing and also using silicone grease for insulation.  Water  washing  of  insulators  which  is  normally recommended so as to remove the pollution from the insulator surface  needs  to  be  done  more  frequently  than  other maintenance methods. Though involves some limitation in practice from the technical and economical point of view. Applying  of  silicon grease on insulators with high cost  of performance  also  is  not  recommended  for  use  in  an environment where high level of NSDD pollution is present. In this paper room temperature vulcanizing (RTV) silicone rubber coating have been presented as a novel approach for improvement of outdoor substation insulators maintenance in polluted area. This method can be used in areas characterized with  “Instantaneous  pollution”  and  or  with  “High  or  Low level of NSDD” with long life expectancy. Financial analysis shows that this method is also economic and optimal choice.