Abb Research Ltd.

Abb Technology Ag

Stephen Clifford

Felix Greuter

Nikolaus Zant

Andrej Krivda

Bandeep Singh

Leopold Ritzer

Patrick Meier

Vincent Tilliette

Steve A Shaw

Hoan D Le

Faustine Soyeux

Veronika Schmid

Lars Schmidt

Polymer concrete electrical insulation including a hardened epoxy resin composition filled with an electrically non-conductive inorganic filler compositions. The polymer concrete electrical insulation system optionally may contain additives. The epoxy resin composition is based on a cycloaliphatic epoxy resin. The inorganic filler composition can be present within the range of about 76% by weight to about 86% by weight, calculated to the total weight of the polymer concrete electrical insulation system. The inorganic filler composition includes a uniform mixture of (i) an inorganic filler with an average grain size within the range of 1 micron (&#x3bc;m) to 100 micron (&#x3bc;m) [component c(i)], and (ii) an inorganic filler with an average grain size within the range of 0.1 mm (100 micron) to 2 mm [component c(ii)]. The inorganic filler with an average grain size within the range of 1 micron (&#x3bc;m) to 100 micron (&#x3bc;m) [component c(i)] can be present in an amount within the range of 22% to 42%, calculated to the total weight of the polymer concrete electrical insulation system; and (e) the inorganic filler with an average grain size within the range of 0.1 mm to 2 mm [component c(ii)] is present within the range of 41% to 61% by weight, calculated to the total weight of the polymer concrete electrical insulation; and method of producing said electrical insulation.

Polymer concrete electrical insulation

The invention is directed to a transformer and a method of manufacturing the same, wherein at least a portion of a core is disposed inside a shield case formed from a polymeric resin composition containing conductive particles. An encasement comprising a dielectric resin encapsulates the shield case. An electrical conductor is electrically connected to the shield case and is accessible from the exterior of the encasement.

Dry-type transformer with a polymer shield case and a method of manufacturing the same

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Bremgarten, Switzerland

Stephen Clifford