Abb Research Ltd.

Leif A Pettersson

Olof Hjortstam

Thorsten Schütte

Rongsheng Liu

Åke Öberg

Albert Jaksts

Ragnar Österlund

Gunilla Eken, Legal Representative

Peter Hidman

Christer I Törnkvist

Tommaso Auletta

An electric insulation material for an electric device includes one or several electrical conductors and an electric insulation material arranged around the conductor or between the conductors, which insulation material is impregnated with a dielectric insulation liquid. The electric insulation material includes a main layer that is provided with a surface layer that has a dielectric constant that is lower than the dielectric constant of the main layer.

Electric insulation material, an electric device comprising the insulation material and a transformer

A varistor including a varistor body with two parallel end faces made of a material that contains one or more metal oxides, and at least one electrode made of an electrically conductive electrode material arranged on any of the end faces of the varistor body. The electrode includes a layer of electrode material coated on the end face by means of an ion- or atom-transferring method, whereby the layer has a thickness within the interval of from 5 micrometers to 30 micro-meters.

Method of manufacturing a varistor

Growing community of inventors

Vasteras, Sweden

Leif A Pettersson