Abb Research Ltd.

Manuela Signorelli

Andrea Catenacci

Cesare Guida

Alberto Abisso

Mario Pregnolato

An electric device for medium and high voltage transmission and/or distribution lines having a free volume V undergoing an electrical stress and including an insulating filler that fills the free volume, wherein the insulating filler includes a compressible silicone-based composition having a volume under normal conditions ranging from 1.01 to 1.2 V at a temperature of 25&deg; C. The silicone-based composition may include hollow compressible plastic microspheres. The silicone-based composition may also include a crosslinkable polyorganosiloxane and an organosilicon crosslinker.

Electric device with silicone insulating filler

A method for filling an electrical device with a multi-component insulating filler, including the steps of: mixing at least two components of insulating filler each with compressible microspheres; measuring at regular intervals a viscosity of each of the at least two components of insulating filler mixed with the microspheres until each of the at least two components of insulating filler have a substantially uniform viscosity; mixing the at least two components of insulating filler together in order to obtain a multi-component insulating filler; extracting air present in a free volume V of the electrical device using a vacuum pump; filling the free volume V of the electrical device with the multi-component insulating filler until the free volume V of the electrical device is completely filled; and injecting an additional amount of the multi-component insulating filler in order to develop overpressure.

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Sotto, Italy

Manuela Signorelli