Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Patent
1979-12-17
1982-03-02
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
174142, 337199, H02H 704
Patent
active
043181503
ABSTRACT:
Protected liquid-filled electrical inductive apparatus having a dry well fuse assembly which includes a dry well fuse holder sealingly disposed through an opening in the associated metallic casing, separate from the electrical bushings, and a removable fuse portion. The dry well fuse holder includes first and second spaced terminals each having portions immersed in the liquid dielectric and portions accessible within the dry well for cooperative engagement with contacts on the removable fuse portion. The first terminal is closer to the metallic casing than the second terminal. Ionization of the air within the dry well fuse holder adjacent to the first terminal is prevented by a tubular shield member mounted on the outside of the dry well fuse holder. One of the axial end portions of the tubular shield member makes electrical contact with the immersed portion of the first terminal. After making such electrical contact, the inside diameter of the shield member then steps or flares outwardly to a larger inside diameter to provide a predetermined uniform spacing between the inner wall of the shield member and the outer wall of the dry well fuse holder. The shield member is dimensioned to extend towards the casing, past the end of the portion of the first terminal which is accessible from within the opening in the dry well fuse holder.
REFERENCES:
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patent: 3892461 (1975-07-01), Keto
Eisenzopf Reinhard J.
Lackey D. R.
Westinghouse Electric Corp.
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