Dry-type encapsulated transformer coils
AssigneeABB Research Ltd.
InventorsStephane Schaal, Cherif Ghoul, Jens Rocks, Charles Johnson
Life of this patent
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Abstract
A dry-type transformer is disclosed wherein the transformer coils are encapsulated with a cured mineral filler containing cyanate ester resin composition which optionally is a cured mineral filler containing epoxy modified cyanate ester resin composition. A method of making the insulating composition, and the non-cured composition, are also disclosed.
Claims23
Dry-type transformer comprising:
- transformer coils encapsulated with a cured mineral filler containing cyanate ester resin composition, which optionally is a cured mineral filler containing an epoxy modified cyanate ester resin composition.
Method of making an insulating composition by mixing a cured mineral filler containing cyanate ester resin composition, which optionally is a cured mineral filler containing an epoxy modified cyanate ester resin composition, optionally under vacuum, in any desired sequence, comprising:
- separately adding a hardener and curing agent to the mixture before curing;
- and
- curing the mixture by heating the mixture to a temperature within a range of 50° C. to 280° C., preferably within a range of 100° C. to 200° C., or curing at lower temperatures up to several days, as a function of a catalyst present and its concentration.
A non-cured composition, containing:
- components (i), (ii) and optionally (iii), wherein component (i) is a cyanate ester resin, which is present within a range of 1%-60% by weight, preferably within a range of 15%-30% by weight, calculated to a total weight of the insulating composition;
- component (ii) is a mineral filler material, which is present within a range of 20%-80% by weight, preferably within a range of 40%-70% by weight, and preferably within a range of 50%-65% by weight, calculated to the total weight of the insulating composition;
- and the optional component (iii) is an epoxy resin, which is present within a range of 1%-50% by weight, preferably within a range of 15%-30% by weight, calculated to the total weight of the insulating composition.
Dependencies are inferred from the claim text.