Abb Research Ltd.

Abb Schweiz Ag

Hitachi Energy Switzerland Ag

Hitachi Energy Ltd

Abb Power Grids Switzerland Ag

Fredrik Sahlen

Henrik Hillborg

Anders Bjorklund

Olof Hjortstam

Claire Pitois

Orlando Girlanda

Lars Wagberg

Lars Schmidt

Anders Eriksson

Torbjorn Brattberg

Erik Keil

Elson Montibon

Lars Schimdt

Lars WÅGBERG

Torbjörn Brattberg

Anders Bjoerklund

A pressboard for high-voltage devices is disclosed. The pressboard has a density of 0.6-1.3 g/cmaccording to IEC60641-2, and includes 1-15% microfibrillated cellulose (MFC) based on the total dry weight of the pressboard. The pressboard also includes an insulation element. For example, the pressboard is impregnated with an electrically insulating compound. The insulation element may be used in a high-voltage device, such as a power transformer.

MFC in pressboards for HV devices

A cellulose based pressboard for insulation in an electrical power transformer, the pressboard includes polyvinylamine (PVAm), and polyacrylamide (PAM), in a combined amount of between 0.01% and 20% by weight of the pressboard.

Pressboard

An electrical insulation system includes a first insulation layer having a first polymer and a first filler in the form of nanoparticles, and a second insulation layer including a second polymer and a second filler in the form of either chromium oxide, CrO, iron oxide, FeO, or a mixture of chromium oxide and iron oxide. At least one of the insulation layers is in the form of a solid and flat sheet. An insulation system combining the first insulation layer with well dispersed nanoparticles and the second insulation layer filled with CrOparticles and/or FeOparticles.

Electrical insulation system

An electrical conductor provided with an electrical insulation system surrounding the conductor, the insulation includes a first insulation layer surrounding the conductor and a second insulation layer surrounding the first insulation layer. The second insulation layer includes a second polymer and a second filler in the form of chromium oxide (CrO), iron oxide (FeO), or a mixture of chromium oxide and iron oxide, wherein the first insulation layer includes a first polymer and a first filler including dispersed nanoparticles.

Electrical conductor with surrounding electrical insulation

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Västerås, Sweden

Fredrik Sahlen