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Resin Impregnated Synthetic (RIS) bushings

Resin Impregnated Synthetics (RIS) is the latest technology within our industry and is very similar to Resin Impregnated Paper (RIP) technology with one exception. Instead of using conventional paper as spacer between the capacitive layers, the bushing's core is wound with synthetic fabrics. Both RIP and RIS bushings use epoxy resin as the main insulation material. The outdoor insulation for oil-air transformer applications, is made from silicone rubber material, either extruded, or molded directly onto the RIS condenser core. RIS bushings do not absorb water (no hygroscopic material like paper is used) and are therefore easier to store. At the same time, they share the same excellent fire-resistant, explosion-proof characteristics and other advantages of traditional dry/RIP bushings.

Our RIS bushings are available for AC transformers and reactors.

Why Hitachi Energy?

  • Complete range and outstanding performance under the most demanding conditions

  • Many years of proven reliability in all continents
  • State-of-the-art production facilities and 100 years of transformer components manufacturing experience

  • Flexible design allows for adaptation to different customer needs and transformer requirements

  • Completely dry bushing, ie, no oil spills, no explosion risk

  • No maintenance or constant monitoring necessary
  • Transport and storage is possible in all positions
  • Partial discharge-free up to double service voltage

Our offering

AC Transformers and reactors



Contact us

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