EP0047592A2 - Schmelzleiter und dessen Kombination in einer Ausblasesicherung - Google Patents

Schmelzleiter und dessen Kombination in einer Ausblasesicherung Download PDF

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Publication number
EP0047592A2
EP0047592A2 EP81303728A EP81303728A EP0047592A2 EP 0047592 A2 EP0047592 A2 EP 0047592A2 EP 81303728 A EP81303728 A EP 81303728A EP 81303728 A EP81303728 A EP 81303728A EP 0047592 A2 EP0047592 A2 EP 0047592A2
Authority
EP
European Patent Office
Prior art keywords
fuse
link
holes
melt
fuse link
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Withdrawn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
EP81303728A
Other languages
English (en)
French (fr)
Other versions
EP0047592A3 (de
Inventor
Wayne W. Lien
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 EP0047592A2 publication Critical patent/EP0047592A2/de
Publication of EP0047592A3 publication Critical patent/EP0047592A3/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Withdrawn legal-status Critical Current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
    • H01H85/055—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
    • H01H85/40—Means for extinguishing or suppressing arc using an arc-extinguishing liquid

Definitions

  • Full range fuses i.e., fuses of the type having short time and long time fuse characteristics are commonly used in high voltage applications. Long time characteristics have been modified by providing holes in the fuse link and by other methods which effect the long term melt characteristic without greatly changing the short term. Although these types of elements have been used extensively, accurate coordination of melt time current characteristic cannot be maintained over the full fuse range.
  • the fuse link of the present invention is provided with a number of predetermined sized holes centrally located in the link to define small cross sectional areas on each side of the holes.
  • the holes are filled with a conductive material having a predetermined melt characteristic to provide a full cross section across the link for current flow.
  • the combination of materials have substantially the same time-current melt characteristic as the fuse link.
  • the fuse link will heat up and the conductive material will melt at known temperature levels wicking out of the holes thus reducing the cross sectional area of the link and producing fusing of the link at predetermined current conditions.
  • the fuse link 10 of the present invention is shown mounted within an expulsion fuse 14.
  • the expulsion fuse can be of the type shown in my co-pending application, Serial No. 134,966 filed on March 28, 1980 and entitled High Current Under Oil Expulsion Fuse and generally includes a glass wound epoxy sleeve 22 having electrically conductive contacts 24 and 26 at the ends.
  • the fuse element 12 extends through the sleeve 22 and electrically interconnects the contacts 24 and 26.
  • a resilient pressure tube 28 is positioned within the sleeve 22 and is formed of a non-tracking, non-conducting material such as Teflon to prevent arc-over on fuse clearing.
  • the expulsion fuse is generally mounted in the transformer and immersed in the insulating oil.
  • the function of the expulsion fuse 14, and a more specific description of its parts and operation, is set forth in my co-pending application and is incorporated herein by reference.
  • the fuse link 10 includes a fuse element 12 which serves as the conductive member of the fuse 14.
  • the time current characteristics of the element 12 is modified by combining different conductive metals in a specific configuration to achieve a variation in the slope and intersection points of the time current characteristic as seen in Figure 4 and described hereinafter.
  • the element 12 is modified by providing a series of holes 16 in or near the center of the element and filling the holes with a conductive material 18 which material has a melt temperature below that of the fuse element 12.
  • a conductive material 18 which material has a melt temperature below that of the fuse element 12.
  • the points which may be specified, are the short time melt below .05 seconds and the long time melt 1,000 to 10,000 seconds.
  • the size of the element 12 is calculated knowing the desired melt time for a specific high current in the 0 to .05 second melt range.
  • the fuse link cross sectional area is calculated for a particular material, i.e. copper, using the formula in inches squared. A flat ribbon of the specified material having the calculated cross sectional area is then used for the fuse element.
  • Means are then provided to modify the fuse element to achieve a long time-current melt characteristic.
  • Such means includes one or more holes 16 drilled in the element to reduce the effective cross section of the element.
  • the holes 16 are centered on the element so that equal reduced cross sections 20 remain on either side of the hole 16.
  • three holes are used which are preferably spaced approximately 1/4 inch apart. This spreads out and equalizes the effect of the holes which gives more consistent results.
  • Means are provided to fill the holes 16 to maintain the short time-current characteristic and to provide the long time-current characteristic.
  • Such means is in the form of the conductive material 18 which in the preferred embodiment is a eutectic solder which melts at low temperatures produced by long time overloads but in combination with the element, in the preferred embodiment, has substantially the same current characteristic as the element at high current overloads.
  • the conductive material 18 which in the preferred embodiment is a eutectic solder which melts at low temperatures produced by long time overloads but in combination with the element, in the preferred embodiment, has substantially the same current characteristic as the element at high current overloads.
  • the melt curve will shift to the left and if decreased, the melt curve will shift to the right.
  • the melt temperature and resistance of the filler material 18 will determine when the filler material will start to show its effect on the long time melt of the element.
  • a low temperature material with resistance greater than copper will have an early or reduced melt time.
  • the eutectic solder system begins to manifest itself at melt times over
  • the fuse sequence of the modified fuse link is as follows. At high currents which produce a melt time of .05 seconds or less on the full cross section of the fuse link, the effect of the filler material in the holes is negligible. At lower currents the fuse element heats uniformally due to the current overload. The greatest temperature is achieved slightly above the element center. This is due to the fact that both end contacts on the fuse holder act to sink the heat out of the fuse link, however, the end contact at the lower end of the fuse link is cooler since it is lower in the oil and because the oil in the fuse tube is heated by the link. The oil rises by convection causing higher temperature oil at the top of the fuse.
  • a time current characteristic curve is shown in Figure 4 which graphically shows the change in characteristic of the operation of the fuse link which is achieved by the present invention.
  • the curve denoted by letter “A” is an average melt curve for a solid copper link having a thickness of .020 inches and a width of .195 inches.
  • This link is formed of a flat strip of copper and shows a melt time of 100 seconds at 500 amperes.
  • a solid eutectic link having the same thickness and width as shown in Curve "A” is shown in Curve "E”. This link shows a melt time of .04 seconds at 500 amps.
  • the curve denoted by the letter “B” is a solid eutectic link having a melt time at 500 amperes of approximately .9 seconds.
  • Means are provided to prevent the fuse link from laying flat against the inner surface of the fuse tube. This is accomplished by twisting the fuse link from 180 to 360° over its length. If the fuse link were to lay flat against the inner surface of the fuse tube, the filler material 16 could pool in the area and the small cross section would not be achieved.
EP81303728A 1980-08-29 1981-08-14 Schmelzleiter und dessen Kombination in einer Ausblasesicherung Withdrawn EP0047592A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18271980A 1980-08-29 1980-08-29
US182719 1980-08-29

Publications (2)

Publication Number Publication Date
EP0047592A2 true EP0047592A2 (de) 1982-03-17
EP0047592A3 EP0047592A3 (de) 1982-03-31

Family

ID=22669714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81303728A Withdrawn EP0047592A3 (de) 1980-08-29 1981-08-14 Schmelzleiter und dessen Kombination in einer Ausblasesicherung

Country Status (3)

Country Link
EP (1) EP0047592A3 (de)
JP (1) JPS5774933A (de)
BR (1) BR8105320A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583918A1 (fr) * 1985-06-24 1986-12-26 Rte Corp Ensemble a cartouche a coupe-circuit a expulsion dirigee sous huile
FR2583917A1 (fr) * 1985-06-24 1986-12-26 Rte Corp Ensemble modulaire a cartouche a coupe-circuit a expulsion dirigee sous huile
EP2874174A1 (de) * 2013-11-15 2015-05-20 Cooper Technologies Company Hochspannungsverstärkte Inline-Sicherungsanordnung, Systeme und Verfahren zur Herstellung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1473284A (en) * 1921-05-17 1923-11-06 Frederick A Feldkamp Electric-fuse element
GB217625A (en) * 1923-02-19 1924-06-19 Vernon Hope Improvements in electric fuses
FR902899A (fr) * 1943-04-16 1945-09-14 Licentia Gmbh Fusibles à fils plats torsadés
GB642990A (en) * 1948-04-30 1950-09-13 E M P Electric Ltd Improvements in electric fuses
DE819709C (de) * 1948-10-02 1951-11-05 Siemens Schuckertwerke A G Uberlastungstraege Schmelzsicherung
US2703352A (en) * 1953-08-13 1955-03-01 Chase Shawmut Co Fuse and fuse link of the time lag type
US3116390A (en) * 1960-09-12 1963-12-31 Fed Pacific Electric Co Dual element fuses
GB1178140A (en) * 1966-12-28 1970-01-21 Gen Electric Canada Improvements in and relating to Fuses

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1473284A (en) * 1921-05-17 1923-11-06 Frederick A Feldkamp Electric-fuse element
GB217625A (en) * 1923-02-19 1924-06-19 Vernon Hope Improvements in electric fuses
FR902899A (fr) * 1943-04-16 1945-09-14 Licentia Gmbh Fusibles à fils plats torsadés
GB642990A (en) * 1948-04-30 1950-09-13 E M P Electric Ltd Improvements in electric fuses
DE819709C (de) * 1948-10-02 1951-11-05 Siemens Schuckertwerke A G Uberlastungstraege Schmelzsicherung
US2703352A (en) * 1953-08-13 1955-03-01 Chase Shawmut Co Fuse and fuse link of the time lag type
US3116390A (en) * 1960-09-12 1963-12-31 Fed Pacific Electric Co Dual element fuses
GB1178140A (en) * 1966-12-28 1970-01-21 Gen Electric Canada Improvements in and relating to Fuses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Bulletin des Schweizerischen Elektrotechnischen Vereins, Vol. 53, June 16, 1962, Zurich, CH H. BOLLETER "Konstruktionsprobleme und Einsatzmoglichketien von Apparateschutz-Schmelzeinsatzen" pages 585-593 * page 587, column 2, lines 22-58 * *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583918A1 (fr) * 1985-06-24 1986-12-26 Rte Corp Ensemble a cartouche a coupe-circuit a expulsion dirigee sous huile
FR2583917A1 (fr) * 1985-06-24 1986-12-26 Rte Corp Ensemble modulaire a cartouche a coupe-circuit a expulsion dirigee sous huile
EP2874174A1 (de) * 2013-11-15 2015-05-20 Cooper Technologies Company Hochspannungsverstärkte Inline-Sicherungsanordnung, Systeme und Verfahren zur Herstellung
CN104934273A (zh) * 2013-11-15 2015-09-23 库柏技术公司 高电压增强同轴熔断器组件、系统及制造方法
CN104934273B (zh) * 2013-11-15 2019-07-30 库柏技术公司 高电压增强同轴熔断器组件、系统及制造方法
US10553386B2 (en) 2013-11-15 2020-02-04 Eaton Intelligent Power Limited High voltage, reinforced in-line fuse assembly, systems, and methods of manufacture

Also Published As

Publication number Publication date
BR8105320A (pt) 1982-05-04
EP0047592A3 (de) 1982-03-31
JPS5774933A (en) 1982-05-11

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

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Inventor name: LIEN, WAYNE W.