US2741680A - Overvoltage arrestor with a discharge in a low temperature atmosphere - Google Patents

Overvoltage arrestor with a discharge in a low temperature atmosphere Download PDF

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Publication number
US2741680A
US2741680A US472030A US47203054A US2741680A US 2741680 A US2741680 A US 2741680A US 472030 A US472030 A US 472030A US 47203054 A US47203054 A US 47203054A US 2741680 A US2741680 A US 2741680A
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US
United States
Prior art keywords
arrestor
overvoltage
contact part
contact
atmosphere
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.)
Expired - Lifetime
Application number
US472030A
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English (en)
Inventor
Lemaigre-Voreaux Pierre
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.)
Claude Paz et Visseaux SA
Original Assignee
Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva
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 Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva filed Critical Societe Anonyme pour les Applications de lElectricite et des Gaz Rares Etablissement Claude Paz et Silva
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Publication of US2741680A publication Critical patent/US2741680A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/01—Details
    • H01H61/013—Heating arrangements for operating relays
    • H01H61/017—Heating by glow discharge or arc in confined space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0059—Arc discharge tubes

Definitions

  • This invention relates to an overvoltage arrestor of the kind comprising a vacuum-tight envelope containing a low-pressure atmosphere, a first and a second electrodes and a first and a second contact parts, said first electrode comprising a bimetallic portion mechanically and electrically connected with said first contact part, said second electrode being electrically connected with said second contact part, said second contact part being located in the path travelled through by said first contact part when said bimetallic portion is heated up.
  • One object of the invention is to provide an overvoltage arrestor of the kind specified having features which give a more thorough security to the equipment where use is made of this arrestor.
  • One feature of the invention is to constitute the contact parts with a metal comprising mainly iron, or nickel,
  • Another feature of the invention is the atmosphere of the arrestor, which comprises one rare gas or a plurality of rare gases, constituting about 99.5% of the atmosphere, the remainder being nitrogen.
  • An optional but advantageous feature of the invention is to shape and arrange the contact parts so that their contact area, when the bimetallic portion of the first electrode has brought them into contact, is very small.
  • the probability of damage of the overvoltage arrestor increases with the number of operations to which it is subjected.
  • the safety of the protecting device is considerably increased by limiting, by a delayed welding of the electrodes, the number of operations of the overvoltage arrestor.
  • Figure l is an elevational view
  • Figure 2 shows a section on the line 11-11 of Figure 1.
  • the overvoltage arrestor represented comprises an envelope 3 formed by a glass tube which is closed at its upper part by a pointed portion 1, the latter originally forming a part of the usual exhaust tube by means of which a vacuum was obtained in the arrestor and a suitable atmosphere subsequently introduced therein.
  • the envelope 3 is closed at its lower portion by a pressed portion 7 in which are sealed the current lead-in wires 6 and 9 for the two electrodes of the overvoltage arrestor.
  • the current lead-in wire 6 is welded to the end of a first electrode 2 which consists, for example, of a nickel rod.
  • the tube 4 is heated to softening point to cause it to weld with the wire 6 as the latter, with a view to its sealing in the portion 7, is made out of a metal which welds easily with glass.
  • the wire 6 may comprise a composite wire known commercially as Dumet.
  • Dumet a composite wire known commercially as Dumet.
  • the tube 4 will remain in position even if it should break, for example owing to a shock to the over-voltage arrestor.
  • the tube 4 is generally not welded to the electrode 2, as the metal of the latter is not selected especially with a view to its welding with glass.
  • the current lead-in wire 9 is butt-welded to a nickel rod 10 which extends substantially parallel to the electrode 2.
  • the place where the wires 9 and 10 are welded to each other is located inside the portion 7.
  • the rod 10, being made of nickel, is not sealed tightly in the portion 7, but the lead-in wire 9 is made of Dumet and hence its sealing in the portion 7 will ensure effective and vacuumtight sealing of the conductors 9, 10.
  • a bimetallic strip 11 is welded at its lower part to the rod 10.
  • a short piece 12 a few millimeters long of a nickel rod is attached by welding, the axis of said piece being substantially at right angles to that of the electrode 2.
  • the piece 12 forms a contact part.
  • contact part 12 and rod 2 which also forms a contact part, are made of nickel, also facilitates the welding of said parts. This has been shown by tests which have also established that similar results may be obtained with contact parts made of metal-s containing mainly iron and nickel. It is to be noted that all metals with an iron or nickel base or an iron and nickel base do not offer this advantage but experience shows easily whether a pair of contact parts are suitable or not.
  • the second electrode of the overvoltage arrestor is constituted by the wire 10, the bimetallic strip 11 and the part 12.
  • the atmosphere in the overvoltage arrestor contains 99.4% argon and 0.6% nitrogen under a pressure of 40 mm. of'mercury.
  • the arrestor is cold the dis tance between the part 12 and electrode 2 is 0.5 mm., the starting voltage of such an arrestor being approximately 225 volts in direct current.
  • Other combinations of interelectrode distance and nature and pressure of the atmosphere may be used for giving either the same starting voltage or different voltages but in all cases, however, the atmosphere should consist of a rare gas and a little nitrogen if the sticking of the electrodes together is desired after a limited number of operations.
  • An overvoltage arrestor comprising a vacuum-tight envelope containing a low-pressure atmosphere, a first and a second electrodes and a first and a second contact parts, said first electrode comprising a bimetallic portion mechanically and electrically connected with said first contact part, said second electrode being electrically connected with said second contact part, said second contact part being located in the path travelled through by said first contact part when said bimetallic portion is heated up; the metals of said first and said second contact parts comprising mainly at least one metal selected from the group consisting of iron and nickel, said atmosphere comprising nitrogen in a proportion of the order of 0.5%, the remainder being comprised of at least one rare gas, and the contact area of said contact parts when the bimetallic portion being warmed-up makes the first contact part touch the second contact part, being very small.

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  • Emergency Protection Circuit Devices (AREA)
US472030A 1953-12-02 1954-11-30 Overvoltage arrestor with a discharge in a low temperature atmosphere Expired - Lifetime US2741680A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2741680X 1953-12-02

Publications (1)

Publication Number Publication Date
US2741680A true US2741680A (en) 1956-04-10

Family

ID=9688344

Family Applications (1)

Application Number Title Priority Date Filing Date
US472030A Expired - Lifetime US2741680A (en) 1953-12-02 1954-11-30 Overvoltage arrestor with a discharge in a low temperature atmosphere

Country Status (3)

Country Link
US (1) US2741680A (enrdf_load_stackoverflow)
BE (1) BE533748A (enrdf_load_stackoverflow)
DE (1) DE1098088B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3162741A (en) * 1960-03-11 1964-12-22 Ericsson Telefon Ab L M Overvoltage arrestor having a light dispersion of fine metallic dust on its inside walls

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627534A (en) * 1947-02-06 1949-08-10 British Thomson Houston Co Ltd Improvements in thermal responsive electric switches
US2502203A (en) * 1947-05-10 1950-03-28 Westinghouse Electric Corp Glow switch
US2650278A (en) * 1951-12-01 1953-08-25 Gen Electric Glow type thermal switch

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627534A (en) * 1947-02-06 1949-08-10 British Thomson Houston Co Ltd Improvements in thermal responsive electric switches
US2502203A (en) * 1947-05-10 1950-03-28 Westinghouse Electric Corp Glow switch
US2650278A (en) * 1951-12-01 1953-08-25 Gen Electric Glow type thermal switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3162741A (en) * 1960-03-11 1964-12-22 Ericsson Telefon Ab L M Overvoltage arrestor having a light dispersion of fine metallic dust on its inside walls

Also Published As

Publication number Publication date
DE1098088B (de) 1961-01-26
BE533748A (enrdf_load_stackoverflow)

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