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HIGH VOLTAGE FUSE HAVING HELICALLY WOUND RIBBON FUSE LINK

  • US 3,571,776 A
  • Filed: 11/24/1969
  • Issued: 03/23/1971
  • Est. Priority Date: 11/24/1969
  • Status: Expired due to Term
First Claim
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1. A current-limiting high-voltage fuse including:

  • a. a ribbon of relatively hard resilient sheet silver of rectangular cross section having a plurality of serially related points of reduced cross-sectional area wound helically with the wide side thereof parallel to an axis to form an extension-springlike structure, said extension-springlike structure having a diameter ranging from about three-sixteenths of an inch to less than one-half of an inch and having when in unloaded condition a spacing between contiguous windings thereof of substantially less than said diameter, said extension-springlike structure being axially stretched to such a degree that the deflection per turn exceeds said diameter resulting in an extension to a predetermined length, said extension-springlike structure having overcenter ends at the ends of the helical portion thereof;

    b. receptacle means defining a cylindrical passage having said predetermined length and an inner diameter ranging from less than about three times to about four times said diameter of said extension-springlike structure, said extension-springlike structure being arranged inside said passage in coaxial relation thereto and said overcenter ends of said extensionspringlike structure being substantially coextensive with the axis of saId passage;

    c. a pair of terminal elements arranged at the ends of said passage each conductively connected to one of said overcenter ends of said extension-springlike structure; and

    d. compacted pulverulent arc-quenching filler means inside said passage submersing said extension-springlike structure, said filler means being the only lateral support of said extensionspringlike structure between said pair of terminal elements of said fuse.

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