Patent ID: 8637773

Claim:
An electric insulation device, comprising: a chamber; and an electrically insulating element formed by a cast polymer solidified into a gel inside said chamber, said electrically insulating element includes: compressible particles in the form of micro-spheres having a diameter ranging from 20 μm to 500 μm distributed therein, and a plurality of particles of a ceramic that has a higher thermal conductivity than a thermal conductivity of said polymer, wherein a volumetric proportion of the ceramic particles is at least 5 vol. % and below 15 vol. and a volumetric portion of the compressible particles is at least 20 vol. % and below 30 vol. %; wherein each one of said compressible particles comprises an elastic shell that sealingly encloses a gas-filled inner volume thereof and the ceramic particles form a plurality of individual agglomerates, and a mean diameter of the agglomerates is above 130 μm.