US2925484A - Air-blast switch with safety valve - Google Patents

Air-blast switch with safety valve Download PDF

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Publication number
US2925484A
US2925484A US734319A US73431958A US2925484A US 2925484 A US2925484 A US 2925484A US 734319 A US734319 A US 734319A US 73431958 A US73431958 A US 73431958A US 2925484 A US2925484 A US 2925484A
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US
United States
Prior art keywords
air
safety valve
blast switch
switch
pressure
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
US734319A
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English (en)
Inventor
Thommen Hans
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US2925484A publication Critical patent/US2925484A/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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material

Definitions

  • This invention relates to electrical switch means, and is concerned more particularly with improvements in power switches equipped with arc extinction chambers.
  • a high pressure is generated in the extinction chambers where the contacts are housed.
  • the high pressure is produced by the electric arc itself, which generates gases. If these switches are blasted with compressed air to extinguish the arc, the above mentioned pressure is added to the pressure of the extinguishing air.
  • the extinction chamber must then be so designed that it can withstand the pressure produced at the circuit-breaking capacity.
  • extinction chambers are arranged on insulators, and the compressed air is conducted through one of these insulators.
  • Several such extinction chambers with switching points are provided, which chambers can be supplied with compressed air by a common insulator. The pressure generated in the extinction chambers exists, then, also in the feed insulators.
  • circuit-breaking powers actually occurring in the mains exceed occasionally the circuit-breaking capacity under particularly unfavorable conditions.
  • the switch is not destroyed by the particularly high pressure. This is not ensured in the known models. It is then necessary to replace at least parts of the switch after these switchings.
  • diaphragms can also be used, which diaphragms break when the pressure becomes too high or detach themselves at too high temperatures.
  • These diaphragms can be soldered into an easy melting metal, for example, tin, which melts through when the temperatures become too high. At high pressure the diaphragm breaks; at high temperatures the surrounding tin melts.
  • Fig. 1 is a diagrammatic view of one form of electrical switch means, including associated arc-extinguishing chambers, showing an application of principles of the present invention
  • Fig. 2 is a sectional view showing the application of the diaphragm.
  • reference number 1 indicates the extinguishing chamber and 2 and 3 are the contacts which together form a nozzle-type contact where the hollow contact 3 is arranged to be movable and presses against the spring 4 when the switch is opened.
  • the extinguishing chamber 1 is provided with a safety valve 5 in which the piston 6 compresses the spring 7 when the pressure becomes excessive.
  • a thermal safety valve 8 operates when the temperature becomes too high; its piston is moved in the upward direction by a tension spring 9 when the latch 10 is withdrawn. This withdrawal is effected by the bimetal strip 11 which bends when the temperature reaches a certain value.
  • Fig. 2 shows a diaphragm 12 which is also built into the wall of the extinguishing chamber. This diaphragm is supported in a metal 13 having a low melting point. When these metal supports melt the diaphragm is forced out and the high pressure gas can escape.
  • An air-blast switch in which the compressed air necessary for actuating and extinguishing the switching points is supplied through hollow insulators and the switching points are arranged in hollow insulators designed as extinction chambers and in which the extinction chambers are equipped with safety valves which respond at excessive pressure allowing air and harmful gases to escape, characterized in that a safety thermal actuating member is located in operative association with an aperture in a wall of an extinction chamber of the switch, said safety thermal actuating member consisting essentially of a piston normally closing said aperture, spring means biased to urge the piston out of closing position in the aperture, and latch means including a bimetal element normally latching said spring means and bending, when heated to a predetermined temperature, to unlatch and release said spring means.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Thermally Actuated Switches (AREA)
US734319A 1957-05-14 1958-05-09 Air-blast switch with safety valve Expired - Lifetime US2925484A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2925484X 1957-05-14

Publications (1)

Publication Number Publication Date
US2925484A true US2925484A (en) 1960-02-16

Family

ID=4572804

Family Applications (1)

Application Number Title Priority Date Filing Date
US734319A Expired - Lifetime US2925484A (en) 1957-05-14 1958-05-09 Air-blast switch with safety valve

Country Status (4)

Country Link
US (1) US2925484A (enrdf_load_html_response)
CH (1) CH354499A (enrdf_load_html_response)
DE (1) DE1048315B (enrdf_load_html_response)
FR (1) FR1209126A (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3197596A (en) * 1960-12-02 1965-07-27 Nat Ind As Outlet arrangement for an arc quenching chamber
US3538282A (en) * 1966-11-29 1970-11-03 Westinghouse Electric Corp Fluid-blast circuit interrupters with exhaust valves responsive solely to the pressure generated by an arc of excessive magnitude
US4065653A (en) * 1977-04-25 1977-12-27 General Electric Company Circuit breaker mounted within an explosion-proof enclosure
US4375022A (en) * 1979-03-23 1983-02-22 Alsthom-Unelec Circuit breaker fitted with a device for indicating a short circuit
FR2744562A1 (fr) * 1996-02-06 1997-08-08 Gec Alsthom T & D Sa Dispositif de decharge de pression a distance du gaz de remplissage d'un disjoncteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336069A (en) * 1918-04-27 1920-04-06 Nicholas J Conrad Circuit-breaker
US1670697A (en) * 1926-04-06 1928-05-22 Gen Electric Electrical apparatus
US2459599A (en) * 1944-09-20 1949-01-18 Westinghouse Electric Corp Circuit interrupter
FR1104071A (fr) * 1954-04-26 1955-11-16 Cie Gen Equip Aeronautique Perfectionnements aux commandes d'interrupteurs électriques
US2838650A (en) * 1956-09-06 1958-06-10 Frederic F Lehr Hot cup and method of making same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336069A (en) * 1918-04-27 1920-04-06 Nicholas J Conrad Circuit-breaker
US1670697A (en) * 1926-04-06 1928-05-22 Gen Electric Electrical apparatus
US2459599A (en) * 1944-09-20 1949-01-18 Westinghouse Electric Corp Circuit interrupter
FR1104071A (fr) * 1954-04-26 1955-11-16 Cie Gen Equip Aeronautique Perfectionnements aux commandes d'interrupteurs électriques
US2838650A (en) * 1956-09-06 1958-06-10 Frederic F Lehr Hot cup and method of making same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3197596A (en) * 1960-12-02 1965-07-27 Nat Ind As Outlet arrangement for an arc quenching chamber
US3538282A (en) * 1966-11-29 1970-11-03 Westinghouse Electric Corp Fluid-blast circuit interrupters with exhaust valves responsive solely to the pressure generated by an arc of excessive magnitude
US4065653A (en) * 1977-04-25 1977-12-27 General Electric Company Circuit breaker mounted within an explosion-proof enclosure
US4375022A (en) * 1979-03-23 1983-02-22 Alsthom-Unelec Circuit breaker fitted with a device for indicating a short circuit
FR2744562A1 (fr) * 1996-02-06 1997-08-08 Gec Alsthom T & D Sa Dispositif de decharge de pression a distance du gaz de remplissage d'un disjoncteur
EP0789374A1 (fr) * 1996-02-06 1997-08-13 Gec Alsthom T & D Sa Dispositif de décharge de pression à distance du gaz de remplissage d'un disjoncteur

Also Published As

Publication number Publication date
FR1209126A (fr) 1960-02-29
CH354499A (de) 1961-05-31
DE1048315B (enrdf_load_html_response) 1959-01-08

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