US3890479A - Fast cut-out pneumatic switch - Google Patents

Fast cut-out pneumatic switch Download PDF

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Publication number
US3890479A
US3890479A US316783A US31678372A US3890479A US 3890479 A US3890479 A US 3890479A US 316783 A US316783 A US 316783A US 31678372 A US31678372 A US 31678372A US 3890479 A US3890479 A US 3890479A
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United States
Prior art keywords
chamber
rod
opening
moving
contact
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
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US316783A
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English (en)
Inventor
Edmond Thuries
Francois Joly
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.)
Cegelec SA
Delle Alsthom SA
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Cegelec SA
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 Cegelec SA filed Critical Cegelec SA
Application granted granted Critical
Publication of US3890479A publication Critical patent/US3890479A/en
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    • 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • H01H33/83—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas wherein the contacts are opened by the flow of air or gas
    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/285—Power arrangements internal to the switch for operating the driving mechanism using electro-dynamic repulsion

Definitions

  • the invention concerns pneumatic switches intended to be opened within a very short time, for example in order to cancel defects in an electric circuit very rapidly.
  • the present invention is intended to provide a pneumatic switch of simple construction which opens very fast, combining the beginning of opening by electrodynamic means with an accelerated continuance of the opening movement under the effect of a compressed gas.
  • Its object is, more particularly, a pneumatic switch comprising a cut-out chamber containing a compressed gas and, in that chamber, a set of contacts whose moving contact is installed 'on a moving rod crossing through a wall of the said chamber.
  • the switch is characterized in that the said moving rod is hollow at least throughout the whole of its length entering the said chamber, the inside of that rod communicating, through an opening in the portion of the rod outside the said chamber, with a low-pressure medium, and has, installed round the moving contact, the body ofa valve which, when the switch is in the closed position, is closed and separates the inside of the said rod from the compressed gas contained in the said chamber.
  • Electro-dynamic means placed on the outside of the said chamber, cause, when they receive a current emission, the beginning of the opening movement of the said moving rod, and, subsequently, the opening of the said valve, this causing the accelerated continuance of the opening movement of the said moving rod under the action of the compressed gas contained in the said chamber.
  • electrodynamic means may, to great advantage, be constituted by two coils exerting, between them, a repulsion effort at the instant of the said current emission: a fixed coil through which the said current emission flows and a short-circuited coil fast with a moving part of the main contact and of the said valve.
  • FIG. I is a partial, sectional view of a cut-out chamber with double axial blowing means and a contact at the end.
  • FIG. 2 concerns a variant of FIG. 1 in which the end contact is replaced by a finger type contact.
  • FIG. 3 is another variant of FIG. I.
  • FIG. 4 shows a cut-out chamber in which the contact opens by the action of two moving parts.
  • FIG. 5 shows a variant of the fluid-tight sealing system of a cut-out chamber of the type shown in FIG. 1.
  • FIG. 6 shows a cut-out chamber having a single axial blowing means.
  • the switch comprises a cutout chamber consisting of an annular tank 1 filled with a high-pressure gas and, on one side of that cut-out chamber, or on both sides of the latter, a low-pressure tank or tanks 2 and 3.
  • the casing 8 of the tank I is at least partly insulating.
  • the passing of the electric current through the tank I is insured by a contact 9 between a moving contact 10 fast with the part 7 and another contact which, in the example in FIG. I, is a semi-moving contact 11 at the end, on which the effort of a spring 12 is exerted.
  • the original opening pulse of the contact 9 is obtained by means of a fixed coil 13, exerting a repulsion effort on the short-circuited coil I4, fast with the moving part 7 by means of an insulating rod I5.
  • a current emission in the coil moves the contact I0 and the moving part 7 which respectively press against the contact 11 and the seat of the fixed part 6 by a few millimeters.
  • the high-pressure of the tank 1 then suddenly exerts an effort on the section of the mobile contact 10 and accelerates the movement of the latter.
  • the are which was set up between the contacts 10 and II is extinguished by the axial double blowing means, going from the tank 1 towards the tanks 2 and 3 respectively, on the one hand, across the contact 10, a tube 16 formed in the moving part and an orifice l7, and on the other hand, across the contact 11 and a tube 18 crossing the fixed part 6.
  • the voltage between contacts is maintained by the air at the average pressure resulting from the balance of pressures after the high-pressure tank has been relieved by the low-pressure tanks. On the outside, the voltage is maintained by the insulation of the chamber.
  • the closing of the contact is obtained by any means.
  • Resistors operating at the instant of closing or opening, and inserted by any method, as well as capacitors insuring the distribution of the voltage between chambers connected up in series, may be connected up in parallel with the cut-out contacts or outside the chamher.
  • FIG. 3 is a variant of FIG. 1, in which the respective dimensions of the parts have been modified.
  • the device comprises two moving contacts 22 and 23 forming an end contact 9 and comprising, respectively. exhaust orifices 24 and 25 in the low pressure tanks 2 and 3. Fluid-tight scaling is effected. as previously, by the valve 5.
  • the moving contact 23 is pulled by the insulating rod 15, and after the opening of the valve 5, the two contacts 22 and 23 are pneumatically accelerated by the high-pressure of the tank 1.
  • FIG. 5 the sliding seal 4 in FIGS. 1 to 4 is replaced by a seat comprising a seal 26.
  • the double blowing means may be replaced by a single blowing means, as shown by FIG. 6.
  • a single blowing means Inside the high-pressure tank 1, an end contact 9 is produced between the moving part 10 and the semi-moving contact 11 pushed by the spring 12.
  • the insulating rod 15 exerts a traction effort on the moving part 10, opens the valve 5 and the high-pressure action pneumatically accelerates the moving part 10.
  • the releasing of the compressed air of the tank 1 towards the single low-pressure tank 2, passing through the tube I0 and the orifices 17, causes the extinguishing of the arc.
  • the device has been shown in FIG. 6 with end contacts 9 and a sliding fluid-tight sealing means 4, but it may be provided with the arrangements shown in FIGS. 2 and 5.
  • the device which is the object of the invention is suit able for any voltages as a circuit-breaker and enables a very fast cancelling of defects. It may also be used in the synthetic test circuits for circuit breakers. In that case, that device insulates the high-voltage circuits, cutting off the discharge of the main capacitor battery in the case of further priming of the capacitor being tested at the passing through zero of the current. It then makes it possible to effect a further cut-out attempt on the following passing of the current through zero.
  • the high are voltages produced by that device may also be used in various directcurrent circuit cuttingout or switching configurations.
  • a pneumatic switch comprising a cut-out chamber containing a compressed gas and, in that chamber, a set of contacts whose moving contact is installed on a moving rod crossing through a wall of said chamber, the improvement wherein: said moving rod is hollow at least throughout the whole of its length entering said chamber, the inside of said rod communicating, through an opening placed in the portion of the rod outside said chamber, with a low-pressure medium, the body of a valve being installed round the moving 5 contact which, when the switch is in the closed position, is closed and separates the inside of the said rod from the compressed gas contained in the said chamber, electrodynamic means being placed on the outstide of said chamber in juxtaposition to said rod and IQ acting directly thereon to cause, when they receive, a current emission, the initiation of movement of said moving rod, and subsequently, the opening of said valve, this causing the accelerated continuance of the opening movement of said moving rod under the action 15 of the compressed gas contained in said chamber, said chamber including a hollow body, defining said seat, said fixed contact being fitted within an
  • a pneumatic switch comprising a cut-out chamher containing a compressed gas and, in that chamber, a set of contacts whose moving contact is installed on a moving rod crossing through a wall of said chamber, the improvement wherein: said moving rod is hollow at least throughout the whole of its length entering said chamber, the inside of said rod communicating, through an opening placed in the portion of the rod outside said chamber, with a low-pressure medium, the body of a valve being installed round the moving contact which, when the switch is in the closed position, is closed and separates the inside of the said rod from the compressed gas contained in the said chamber, electrodynamic means being placed on the outside of said chamber in juxtaposition to said rod and acting directly thereon to cause, when they receive, a current emission, the initiation of movement of said moving rod, and subsequently, the opening of said valve, this causing the accelerated continuance of the opening movement of said moving rod under the action of the compressed gas contained in said chamber, said cut-out chamber comprising a cylinder, the moving rod extending through the wall of said chamber on

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US316783A 1971-12-21 1972-12-20 Fast cut-out pneumatic switch Expired - Lifetime US3890479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7146011A FR2165184A5 (enExample) 1971-12-21 1971-12-21

Publications (1)

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US3890479A true US3890479A (en) 1975-06-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US316783A Expired - Lifetime US3890479A (en) 1971-12-21 1972-12-20 Fast cut-out pneumatic switch

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US (1) US3890479A (enExample)
FR (1) FR2165184A5 (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150053647A1 (en) * 2012-05-31 2015-02-26 Mitsubishi Electric Corporation Gas circuit breaker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439140A (en) * 1965-07-28 1969-04-15 Bbc Brown Boveri & Cie Pressure gas operated switch with closed gas circuit
US3522400A (en) * 1966-12-15 1970-07-28 Ite Imperial Corp Annular sliding valve for air blast circuit breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439140A (en) * 1965-07-28 1969-04-15 Bbc Brown Boveri & Cie Pressure gas operated switch with closed gas circuit
US3522400A (en) * 1966-12-15 1970-07-28 Ite Imperial Corp Annular sliding valve for air blast circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150053647A1 (en) * 2012-05-31 2015-02-26 Mitsubishi Electric Corporation Gas circuit breaker
US9349556B2 (en) * 2012-05-31 2016-05-24 Mitsubishi Electric Corporation Gas circuit breaker

Also Published As

Publication number Publication date
FR2165184A5 (enExample) 1973-08-03

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