Surge arrester with moulded sheds and apparatus for moulding
AssigneeABB Schweiz AG
InventorsDaniel Johansson, Christian Gustavsson, Eija Lindberg, Elisabeth Faxö
Life of this patent
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Abstract
A high voltage surge arrester including insulating polymer housing with a protruding shed. The shed has an upper shed surface that forms a blunt angle with the longitudinal axis of the surge arrester and a lower shed surface. The lower shed surface includes an inner portion that forms an essentially right angle with said axis and an outer portion that forms an acute angle with said axis. Further the invention relates to an apparatus for molding an electrically insulating polymer housing.
Claims13
A high voltage surge arrester comprising a varistor element surrounded by an electrically insulating polymer housing with a protruding shed, said shed having an upper shed surface that forms a blunt angle with the longitudinal axis of the surge arrester and a lower shed surface, characterised in that the lower shed surface comprises
- an inner portion that forms an essentially right angle with said axis and
- an outer portion that forms an acute angle with said axis, wherein
- said inner portion constitutes 20-80% of the shed extension and
- said essentially right angle is 89-91°.
An apparatus for moulding an electrically insulating polymer housing with protruding sheds, which apparatus comprises a first mould part and a second mould part which when brought together form a mould half for a shed, wherein said first mould part comprises a first mould surface that is essentially evenly inclined for forming an upper shed surface and said second mould part comprises a second mould surface for forming a lower shed surface, characterised in that the second mould surface comprises
- an inner mould surface that is essentially perpendicular to the rotational axis for forming an inner portion of the lower shed surface and
- an outer mould surface that is inclined with respect to the inner mould surface for forming an outer portion of the lower shed surface, wherein
- said inner mould surface constitutes 20-80% of the shed extension and
- said inner mould surface forms an angle of 89-91° with respect to the rotational axis.
Dependencies are inferred from the claim text.