EP0029869A1 - Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung - Google Patents

Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung Download PDF

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Publication number
EP0029869A1
EP0029869A1 EP79302720A EP79302720A EP0029869A1 EP 0029869 A1 EP0029869 A1 EP 0029869A1 EP 79302720 A EP79302720 A EP 79302720A EP 79302720 A EP79302720 A EP 79302720A EP 0029869 A1 EP0029869 A1 EP 0029869A1
Authority
EP
European Patent Office
Prior art keywords
plates
slot
spider assembly
fuse
support surfaces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP79302720A
Other languages
English (en)
French (fr)
Inventor
William T. Huber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cooper Power Acquisition Corp
Original Assignee
RTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RTE Corp filed Critical RTE Corp
Priority to EP79302720A priority Critical patent/EP0029869A1/de
Publication of EP0029869A1 publication Critical patent/EP0029869A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/18—Casing fillings, e.g. powder
    • H01H85/185—Insulating members for supporting fusible elements inside a casing, e.g. for helically wound fusible elements

Definitions

  • This invention relates to a spider assembly for a high voltage fuse.
  • Spide assemblies for supporting fusable ribbon elements have been fabricated from numerous materials mainly classified as good dielectrics either gas evolving (organic) or non-gas evolving (in-organic). It has been the general practice to use mylar (organic) and mica with in-organic binders to make four ribbed spiders. These have been fabricated with and without notches in the ribs. Ceramic spiders generally do not have notches as the cost of producing them is prohibitive. Efforts to increase the number of ribs to six have been limited due to the additional cost and the difficulty of extruding a six rib structure and the cost of cutting notches in the ribs.
  • a spider assembly to support a fusable ribbon to be mounted within a housing which contains a granular dielectric material, comprising a number of plates (20) having support surfaces (40) along their longitudinal edges, each support surface (40) on each plate (20A) being offset with respect to each other (40) and with respect to the support surfaces (40) on the other plates (20B,20C), each plate (20) including at least one longitudinal slot (32,34,36,38) intermediate the longitudinal edges of the plates (20) whereby the plates (20) can be cross fitted into each other with the plates (20) being angularly related so that the support surfaces (40) define a helical path for the fusable ribbon (26).
  • This arrangement provides a more circular circum- f erence and an increased ribbon length for the same length spider.
  • notches (42) are provided in the longitudinal edges of the plate (20) between each pair of support surfaces (40) whereby dielectric material (28) in the notches (42) will insulate the turns of the ribbon (28) from each other.
  • a high voltage fuse comprising a cylindrical housing (12), a granular dielectric material (28) in said housing (12) and a spider assembly (10) imbedded in said dielectric material (28), said spider assembly (10) including three mica plates (20) of substantially equal length, each plate (20) to form six ribs and fuse means (26) supported on the longitudinal edges (40) of said ribs.
  • the spider assembly according to one embodiment of the invention is shown mounted in a cylindrical insulating housing (12) and supported therein by an end cap assembly (14) provided on each end of the housing (12).
  • the cylindrical housing is generally formed from a suitable dielectric material such as a plastic resin.
  • the end cap assemblies each include a metallic cap (16) which is mounted over the end of the cylindrical housing and has a circuit connecting member (18) provided on each end cap. The end caps are sealed to the housing in a conventional manner.
  • the spider assembly (10) includes a number of flat support plates (20) which are closely fitted together and held in a fixed relation with respect to each other by conductive metallic plates (22 & 24).
  • the plates (22 & 24) are provided at each end of the support plates (20).
  • a pair of fusable ribbons (26) are shown helically wound about the outer edges of the support plates (20) and soldered to the metallic plates (22 & 24) at each end of the fusable ribbon.
  • the cylindrical housing (12) can be filled with a suitable granular dielectric material (28) such as silica sand or coarse sand which entirely surroundsthe fusable ribbon (26).
  • a suitable granular dielectric material (28) such as silica sand or coarse sand which entirely surroundsthe fusable ribbon (26).
  • the fusable ribbons are fabricated from silver, although other alloys are usable, and dimensioned to melt when a predetermined magnitude of current is conducted through the ribbon.
  • the ribbons are insulated by the dielectric material (28).
  • a second fusable element assembly (30) can be provided on the end of the fusable ribbons if a full range fuse is desired.
  • each plate is in the form of a flat sheet like member formed of a suitable dielectric material such as mica paper.
  • Slot means are provided in each of the plates to allow the plates to becross fitted to form the spider assembly for the fusable ribbon.
  • the plate 20A is provided with a pair of slots 32 and 34 of unequal length located intermediate the longitudinal edges of the plate 20A.
  • the plate 20B includes a longitudinal slot 36 intermediate the longitudinal edges of plate 20B.
  • the plate 20C includes a longitudinal slot 38 intermediate the longitudinal edges of the plate 20C.
  • each of the plates includes a number of support surfaces 40 along each of their longitudinal edges.
  • the support surfaces being separated by means of notches 42.
  • the support surfaces 40 are equally spaced along each longitudinal edge with the support surfaces on each longitudinal edge being offset with respect to each other and also offset with respect to the support surfaces 40 provided on each of the other plates (20B and 20C).
  • the spider assembly is formed by cross fitting the slot 36 in plate 20B with the slot 32 in plate 20A and the slot 38 in plate 20C with the slots 34 in plate 20A and 36 in plate 20B.
  • the combined length of the slots 32 and 36 should be equal to the length of one of the plates 20.
  • the combined length of the slots 34 and 38 also should be equal to the length of one of the plates 20.
  • each of the terminator plates includes a central aperture 44 with a plurality of notches 46 located 60 degrees apart to accommodate ends of the plates 20.
  • the fusable ribbons 26 and the second fusable assemblies 30 are helically wrapped around the support surfaces 40. Since each plate 20 is shaped different in that the support surfaces are offset with respect to each other, a predetermined pitch can be provided for the fusable ribbon 26 as they are helically wound about the assembled plates 20.
  • the spider assembly 10 is positioned in the cylindrical housing 12 with the metallic terminator plates 22 and 24 secured to the end caps 16.
  • the housing 12 is then filled with the granular dielectric material 28. It should be noted that the granular material will fill the notches 42 between the support surfaces 40 thus providing insulating material between the turns of the fusable ribbons mounted on the support surfaces 40.
  • the use of six ribs provides a greater circular circumference and thus an increased length for the fusable ribbons for the same length spider assembly.

Landscapes

  • Fuses (AREA)
EP79302720A 1979-11-29 1979-11-29 Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung Withdrawn EP0029869A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP79302720A EP0029869A1 (de) 1979-11-29 1979-11-29 Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP79302720A EP0029869A1 (de) 1979-11-29 1979-11-29 Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung

Publications (1)

Publication Number Publication Date
EP0029869A1 true EP0029869A1 (de) 1981-06-10

Family

ID=8186471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302720A Withdrawn EP0029869A1 (de) 1979-11-29 1979-11-29 Sternförmiger Einsatz für Hochspannungssicherung und eine derartige Sicherung

Country Status (1)

Country Link
EP (1) EP0029869A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE730954C (de) * 1932-12-29 1943-01-29 Aeg Geschlossene Hochspannungssicherung
US3569891A (en) * 1969-10-31 1971-03-09 Westinghouse Electric Corp Current limiting fuse
US3733572A (en) * 1970-12-24 1973-05-15 Mc Graw Edison Co Current limiting fuse
US3801945A (en) * 1970-10-14 1974-04-02 Gen Electric Canada Quick acting high voltage fuse
US3962666A (en) * 1975-04-28 1976-06-08 The Chase-Shawmut Company Support plates for a helically wound fusible element

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE730954C (de) * 1932-12-29 1943-01-29 Aeg Geschlossene Hochspannungssicherung
US3569891A (en) * 1969-10-31 1971-03-09 Westinghouse Electric Corp Current limiting fuse
US3801945A (en) * 1970-10-14 1974-04-02 Gen Electric Canada Quick acting high voltage fuse
US3733572A (en) * 1970-12-24 1973-05-15 Mc Graw Edison Co Current limiting fuse
US3962666A (en) * 1975-04-28 1976-06-08 The Chase-Shawmut Company Support plates for a helically wound fusible element

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19810817

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840320

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HUBER, WILLIAM T.