To avoid leakage currents, discharges and pollution flashovers, a silicone layer is applied to the insulator surface by using a special spray coating technique. This silicone layer provides a hydrophobic surface, combating the negative effects of contamination and enhancing the electrical characteristics and low leakage currents in highly polluted areas.

PPC Insulators is one of the very few insulator manufacturers able to offer RTV coating directly to our customers without involving an external company for this service.

In-house silicone coating

In-house coating is especially advantageous for projects using new insulators. A product ready to be installed is delivered and a hydrophobic insulator surface is assured from the very first day. De-energizing of the substations for frequent washing is no longer required and maintenance expenditure is reduced to a minimum compared to conventional porcelain insulator surfaces.

Onsite silicone coating

Upgrading existing substation equipment is possible by on-site coating. A trained and experienced coating team is sent to the de-energized substation. Our On-site coating is environmentally friendly – no dangerous or hazardous materials are used. At the moment the On-site coating service is offered in Europe only

Main benefits of RTV-Silicone coating

  • Excellent self cleaning characteristics and long-term resistance to weathering and difficult environments
  • Long-term hydrophobicity due to the migration of low molecular weight (LMW) siloxanes into the pollution layer
  • Suppression of leakage current, discharges and pollution flashover
  • Long-term RTV stability makes repeated application of grease unnecessary.
  • Reduced maintenance expenditure, as in washing, compared to conventional insulator surfaces.
  • Facilitated cleaning in case of extreme pollution deposition (e.g. cement); even most difficult pollutants can be wiped off with a cloth.
  • RTV coated surfaces withstand high pressure jet washing up to 90 bar (normal application, 25cm distance)
  • The best of both worlds, mechanical strength of porcelain and pollution performance of silicone rubber.
  • Non toxic and environmentally friendly material
  • Transmission reliability as well as environmental and resource conservation by efficiently utilizing generated power

Hydrophobicity Transfer

In the case of pollution particle deposition on the coater layer, the low molecular weight (LMW) will spread from the silicone bulk material to the pollution layer and encapsulates these particles within a short time period. Now the insulator surface is hydrophobic again.

Frequently Asked Questions

For which regions the on-site coating service is offered?

Europe

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