EP0046392A2 - Fusible de limitation du courant de pleine charge - Google Patents

Fusible de limitation du courant de pleine charge Download PDF

Info

Publication number
EP0046392A2
EP0046392A2 EP81303727A EP81303727A EP0046392A2 EP 0046392 A2 EP0046392 A2 EP 0046392A2 EP 81303727 A EP81303727 A EP 81303727A EP 81303727 A EP81303727 A EP 81303727A EP 0046392 A2 EP0046392 A2 EP 0046392A2
Authority
EP
European Patent Office
Prior art keywords
wire
tube
fuse
current
assembly
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Withdrawn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
EP81303727A
Other languages
German (de)
English (en)
Other versions
EP0046392A3 (fr
Inventor
William J. Huber
Gordon T. Borck
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
Publication of EP0046392A2 publication Critical patent/EP0046392A2/fr
Publication of EP0046392A3 publication Critical patent/EP0046392A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • H01H85/46—Circuit arrangements not adapted to a particular application of the protective device
    • 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
    • H01H85/055—Fusible members
    • 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
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H85/42—Means for extinguishing or suppressing arc using an arc-extinguishing gas

Definitions

  • the silver ribbons do not melt open in a manner to permit efficient clearing of the arc.
  • One of the causes of the pressure build-up within the silicone tube using a tin wire is that the tin has a homogenous resistance per unit length thus heating of the wire will occur across the full length of the wire. Once the wire reaches the melting temperature, under relatively high current, the entire wire vaporizes and turns into an arc path. This sudden change of state of the complete wire causes high enough pressure levels to burst the tube because there is no time for the gases to travel the length of the tube and escape at the ends. The molten tin is also forced to the ends of the tube obstructing the free flow of gases out of the ends of the tube.
  • the low current fuse assembly uses a silver wire inside of a constricting silicone tube with an M-spot provided on the wire intermediate the ends of the tube.
  • the M-spot comprising an eutectic solder member soldered to the center of the wire.
  • the M-spot provides two functions: it causes the silver wire to melt open at a temperature not much higher than tin, thus protecting the tube from thermal damage, and consistently opens the silver wire at the midpoint, thereby initiating arcing at the midpoint of the wire.
  • the broken wire thus burns back in both directions and because of the higher vaporization temperature of silver, it requires more time to burn back under the same arc energy conditions as encountered by the tin wire. This slower vaporization permits the gases to escape through the ends of the tube before pressures are built up in the tube sufficient to burst it. The internal pressure within the tube is still effective to deionize and terminate the arc.
  • the slower vaporization of the silver wire also allows a more efficient escape of the molten metal and gases from the tube.
  • the silver wire is slowly consumed by the arc, the molten by-products of the wire are expelled from the tube with the high pressure gases and clogging is prevented since the exit openings at the ends of the tube are large enough to handle the molten metal and gases generated by the heat of the arc.
  • the fuse assembly 10 generally includes an insulating tube 12 formed of a material such as silver which deionizes at the arcing temperature of the wire.
  • a silver wire 14 is placed in the tube and extends outwardly from each end of the tube.
  • An M-spot 16 is provided on the wire 14 intermediate the ends and consists of a low melting eutectic alloy such as solder.
  • Means can be provided on the tube 12 to strengthen the tube. Such means can be in the form of a glass roving sleeve 18 provided on the outside surface of the tube 12.
  • the operation of the fuse assembly basically involves the introduction of a high current through the silver wire 14 which causes the silver wire 14 to generate heat sufficient to melt the eutectic solder 16.
  • the eutectic solder amalgamates with the silver wire 14 causing it to break at the center, producing a gap.
  • the gap increases in width as the arc across the gap vaporizes the exposed ends of the silver wire.
  • the gap progressively increasing until sufficient heat has been created to cause the tube to produce a deionized atmosphere within the tube which extinguishes the arc.
  • the fuse assembly 110 includes a tube 112 and a pair of silver wires 114 which abut each other centrally within the tube 112.
  • Means are provided at the point of abutment of the two wires 114 to produce a low current characteristic for the silver wires.
  • Such means is in the form of a eutectic solder 116 which connects the two wires 114.
  • Means in the form of a glass roving 118 can be provided on the outside surface of the tube 112 to reinforce the tube if required.
  • Either of the fuse assemblies 10 or 110 can be used in a low duty non-current limiting fuse 20 as shown in Figure 3.
  • the fuse 20 includes an insulating housing 22 having conductive caps 24 mounted on each end.
  • the fuse assembly 10 is positioned within the housing with the ends of the silver wire 14 soldered to the end caps 24.
  • the housing is filled with an arc quenching material 26 such as silica sand.
  • the full range fuse assembly 30 includes a spider 32 having a first fuse assembly 34 having a high current clearing characteristic and a second fuse assembly 36 having low current clearing characteristics.
  • the second fuse assembly consisting of four of the fuse assemblies 10 or 110 connected electrically in parallel which are in series to the first fuse assembly.
  • the fuse assembly 30 is placed in a casing and filled with arc quenching material such as silica sand.
  • the elements 36 interrupt currents of low (1.5 x-rating) to intermediate (6-7 x-rating) levels while the first fuse assembly 34 interrupt currents from intermediate levels to the maximum rating of the fuse.
  • a multiple time current fuse 40 which generally includes a housing 42 having electrically conddctive end caps 44 secured to each end.
  • the end caps 44 are electrically interconnected by means of a number of series connected fuse members.
  • Such means includes either of the fuse assemblies 10 or 110 connected in series with a first fuse member 46 and a second fuse member 48.
  • the first fuse member 46 includes a tin wire 52 confined within a tube 50.
  • the tin wire 52 having a low time current clearing characteristic.
  • the second fuse member 48 includes a copper or silver wire 56 confined within a tube 54.
  • the silver wire providing a high time current clearing characteristic.
  • the fuse assemblies 10 and 110 provide an intermediate time current clearing characteristic.
  • the housing is filled with an arc quenching material 58 such as silica sand.
  • arc quenching material 58 such as silica sand.

Landscapes

  • Fuses (AREA)
EP81303727A 1980-08-18 1981-08-14 Fusible de limitation du courant de pleine charge Withdrawn EP0046392A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17872580A 1980-08-18 1980-08-18
US178725 1988-04-06

Publications (2)

Publication Number Publication Date
EP0046392A2 true EP0046392A2 (fr) 1982-02-24
EP0046392A3 EP0046392A3 (fr) 1982-07-21

Family

ID=22653697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303727A Withdrawn EP0046392A3 (fr) 1980-08-18 1981-08-14 Fusible de limitation du courant de pleine charge

Country Status (6)

Country Link
EP (1) EP0046392A3 (fr)
JP (1) JPS5772231A (fr)
KR (1) KR830006794A (fr)
AR (1) AR225236A1 (fr)
AU (1) AU7358481A (fr)
BR (1) BR8104965A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60147142U (ja) * 1984-03-09 1985-09-30 株式会社明電舎 限流フユ−ズ

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL142815B (nl) * 1970-09-15 1974-07-15 Olvis Smeltzekeringen Werkwijze voor het vervaardigen van een smeltveiligheid, in het bijzonder voor geringe stroomsterkte, alsmede aldus vervaardigde smeltveiligheid.
US3825870A (en) * 1970-11-11 1974-07-23 Takamatsu Electric Works Ltd Fuse element and a high voltage current-limiting fuse
US3701069A (en) * 1971-05-13 1972-10-24 Chase Shawmut Co Electric cartridge fuse
US3840836A (en) * 1972-07-26 1974-10-08 Rte Corp Current limiting sand fuse
US3855563A (en) * 1973-11-21 1974-12-17 Westinghouse Electric Corp Circuit interrupter
US3913050A (en) * 1974-06-03 1975-10-14 Rte Corp Fuse assembly for current limiting fuses
US4134094A (en) * 1977-05-05 1979-01-09 Mcgraw-Edison Company Fuse element

Also Published As

Publication number Publication date
KR830006794A (ko) 1983-10-06
AR225236A1 (es) 1982-02-26
EP0046392A3 (fr) 1982-07-21
AU7358481A (en) 1982-02-25
JPS5772231A (en) 1982-05-06
BR8104965A (pt) 1982-04-20

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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 NL SE

PUAL Search report despatched

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RHK1 Main classification (correction)

Ipc: H01H 85/04

AK Designated contracting states

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

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: 19830618

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BORCK, GORDON T.

Inventor name: HUBER, WILLIAM J.