EP0398116A1 - Mittelspannungsschalter mit Selbstbeblasung - Google Patents

Mittelspannungsschalter mit Selbstbeblasung Download PDF

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Publication number
EP0398116A1
EP0398116A1 EP90108556A EP90108556A EP0398116A1 EP 0398116 A1 EP0398116 A1 EP 0398116A1 EP 90108556 A EP90108556 A EP 90108556A EP 90108556 A EP90108556 A EP 90108556A EP 0398116 A1 EP0398116 A1 EP 0398116A1
Authority
EP
European Patent Office
Prior art keywords
volume
circuit breaker
contact
breaker according
current
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.)
Granted
Application number
EP90108556A
Other languages
English (en)
French (fr)
Other versions
EP0398116B1 (de
Inventor
Edmond Thuries
Denis Dufournet
Michel Perret
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom 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 GEC Alsthom SA filed Critical GEC Alsthom SA
Priority to AT90108556T priority Critical patent/ATE103415T1/de
Publication of EP0398116A1 publication Critical patent/EP0398116A1/de
Application granted granted Critical
Publication of EP0398116B1 publication Critical patent/EP0398116B1/de
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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow

Definitions

  • the present invention relates to a medium-voltage circuit breaker in which the insulation is ensured by a gas with good dielectric properties, such as sulfur hexafluoride (SF6), this same gas ensuring by self-blowing the extinction of the arc that forms when the circuit breaker opens.
  • a gas with good dielectric properties such as sulfur hexafluoride (SF6)
  • Such a circuit breaker is known, for example from the article in the Revue Brown Boveri 3-87 pages 150 to 156.
  • thermal volume in which the gas, heated by the arc, undergoes an increase in pressure; at the first zero crossing of the alternating current to be cut, the arc decreases in intensity and the gas expands by blowing the arc.
  • a circuit breaker of this type has drawbacks: - when the low currents are cut (for example current with intensity lower than the nominal value), the pressure increase may be insufficient or too large, depending on the size of the thermal volume. If the thermal volume is large, the pressure build-up is low and the blowing may be insufficient to cut the arc on the first zero crossing of the current; if the thermal volume is low, the pressure rise is significant, but the duration of the blowing may be insufficient for good efficiency. - when cutting high-value currents (short-circuit current for example), the pressure build-up must not be too great, which could lead to risks of damage to the breaking chamber.
  • An object of the present invention is to provide a circuit breaker having a safe and secure operation for all the values of the current to be cut.
  • circuit breaker with a variable thermal volume depending on whether the current to be cut has a low or high intensity.
  • the subject of the invention is a medium-voltage circuit breaker comprising, inside an envelope filled with a dielectric gas, a breaking chamber comprising a fixed main contact, a movable main contact and a first volume in the vicinity of a fixed arcing contact and a movable arcing contact, characterized in that it comprises a second volume adjacent to said first volume and associated with means for placing said first and second volumes in communication only when the value of current to be cut reaches, during a tripping operation, a given threshold value.
  • FIG. 1 there is a cylindrical insulating envelope 1 of axis xx, closed at one end by a metal shell 2. The second end of the envelope has not been shown.
  • the envelope is made in a sealed manner and is filled with a gas with good dielectric properties, such as sulfur hexafluoride (SF6), under a pressure of a few bars.
  • a first socket 3 crosses the envelope and is connected to a cylindrical part 4, of axis xx, constituting the fixed main contact of the circuit breaker.
  • a second socket 5 of the circuit breaker crosses the casing in a sealed manner and is in electrical contact, by means of sliding contacts 6, with a metal rod 7, of axis xx, constituting the movable arcing contact of the circuit breaker.
  • the rod 7 is provided, at a first end, with a wearing part 7A made of a material resistant well to the destructive effects of the electric arc, for example an alloy based on tungsten.
  • the other end of the rod 7 is articulated to an operating rod 8 made of an insulating material.
  • To the rod 7 is fixed a ring of contact fingers 9, constituting the movable main contact of the circuit breaker, and cooperating, when the circuit breaker is closed (case of FIG. 1), with the tubular part 4 for the passage of the permanent current.
  • the fingers 9 are fixed to the tube 7 by a crown 10, machined with the tube, and provided with orifices 11 so as not to hinder the movements of the gas during the maneuvers of the latter, as will be explained below.
  • the socket 5 which, inside the envelope, takes the form of a crown, is provided with orifices 12.
  • V1 will denote below the volume delimited, inside the envelope 1, by the sockets 3 and 5 and the tube 7.
  • a ring of fingers 14, each terminated by a wear pad 14A, is fixed to the top 15 of the shell, and constitutes the movable arcing contact of the circuit breaker.
  • the contacts 15 and the tube 7 define a volume V2; this volume is closed by a tubular valve 16 of axis xx, cooperating with an insulating tubular part 17, integral with the contact fingers 14 and sliding in leaktight manner, thanks to a sealing segment 17A, on the tube 7.
  • the valve tubular 16 can move parallel to the axis xx, and is recalled by a spring 18 which rests on a jacket 20 of insulating material which matches the shape of the shell 2 and constitutes with it a passage 21 communicating with the volume V1 by openings 22 of the socket 3.
  • the part 20 has a solid part 20A, forming a blowing nozzle, in contact with the tube 7; the part 20 delimits inside it a volume V3 which can communicate with the volume V2, when the valve 16 is open, by holes 14B made in the fingers 14; the volume V3 communicates with the volume V2, when the rod 7 is pulled to the right of the figure, by the passage 24 between the parts 17 and 20A; finally, the volume V2 communicates with the passage 21, when the valve 16 is pushed to the left of the figure, by holes 16A made in this valve.
  • the circuit breaker works as follows:
  • the operating rod 8 is actuated by a mechanism not shown but conventional in the technique of circuit breakers; the rod moves to the right of the figure and causes the movable arcing contact 7.
  • the main contacts 4 and 9 separate, and the current then passes through the shell 2, the part 15, the fingers 14, the tube 7 , contacts 6 and socket 5.
  • the increase in pressure in the volume V2 is still insufficient to move the valve 16; but it allows a small blowing of the arc by displacement of the gas from V2 to V1, when the end of the tube 7 exceeds the segment 16A, then from V2 to V1, when the end of the tube 7 exceeds the nozzle 20A.
  • the gas of volume V2 expands and comes to lick the contact 14A, at one of the roots of the arc; when the contact 7 exceeds the nozzle 20A, the gas of the volume V3 escapes through the passage 24, comes to lick the contact 7A, at the other root of the arc and is evacuated through the holes 16A and the nozzle 20A.
  • the device allows a double blowing of the arc for cutting the strong currents, which is a guarantee of efficiency.
  • the orifices 11 and 12 of large cross section, allow a free circulation of the gas inside the device, which promotes stirring ensuring the regeneration of the dielectric power after each operation.
  • the current is cut off for all the values of the current at cut.
  • the revolutionary construction allows easy adjustment and maintenance.
  • the invention applies to medium voltage circuit breakers, for example between 3 and 45 kilovolts.

Landscapes

  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP90108556A 1989-05-11 1990-05-07 Mittelspannungsschalter mit Selbstbeblasung Expired - Lifetime EP0398116B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90108556T ATE103415T1 (de) 1989-05-11 1990-05-07 Mittelspannungsschalter mit selbstbeblasung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8906199 1989-05-11
FR8906199A FR2646960B1 (fr) 1989-05-11 1989-05-11 Disjoncteur a moyenne tension a autosoufflage

Publications (2)

Publication Number Publication Date
EP0398116A1 true EP0398116A1 (de) 1990-11-22
EP0398116B1 EP0398116B1 (de) 1994-03-23

Family

ID=9381583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90108556A Expired - Lifetime EP0398116B1 (de) 1989-05-11 1990-05-07 Mittelspannungsschalter mit Selbstbeblasung

Country Status (4)

Country Link
EP (1) EP0398116B1 (de)
AT (1) ATE103415T1 (de)
DE (1) DE69007531T2 (de)
FR (1) FR2646960B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385212A1 (fr) * 1977-03-24 1978-10-20 Mitsubishi Electric Corp Interrupteur de circuit
US4253002A (en) * 1977-03-24 1981-02-24 Mitsubishi Denki Kabushiki Kaisha Self-extinguishing type circuit interrupter
EP0150079A2 (de) * 1984-01-20 1985-07-31 SACE S.p.A. Costruzioni Elettromeccaniche Elektrischer Schalter der Art mit einem Lichtbogenlöschfluidum, mit durch Zusammenbruch des Fluidums selbstgeneriertem Druck
EP0177714A2 (de) * 1984-10-10 1986-04-16 BBC Brown Boveri AG Druckgasschalter
EP0315505A1 (de) * 1987-11-04 1989-05-10 Merlin Gerin Elektrischer selbstgeblasener Lastschalter mit veränderlichem Löschkammervolumen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385212A1 (fr) * 1977-03-24 1978-10-20 Mitsubishi Electric Corp Interrupteur de circuit
US4253002A (en) * 1977-03-24 1981-02-24 Mitsubishi Denki Kabushiki Kaisha Self-extinguishing type circuit interrupter
EP0150079A2 (de) * 1984-01-20 1985-07-31 SACE S.p.A. Costruzioni Elettromeccaniche Elektrischer Schalter der Art mit einem Lichtbogenlöschfluidum, mit durch Zusammenbruch des Fluidums selbstgeneriertem Druck
EP0177714A2 (de) * 1984-10-10 1986-04-16 BBC Brown Boveri AG Druckgasschalter
EP0315505A1 (de) * 1987-11-04 1989-05-10 Merlin Gerin Elektrischer selbstgeblasener Lastschalter mit veränderlichem Löschkammervolumen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BROWN BOVERI REVIEW *

Also Published As

Publication number Publication date
FR2646960B1 (fr) 1993-12-10
DE69007531D1 (de) 1994-04-28
ATE103415T1 (de) 1994-04-15
DE69007531T2 (de) 1994-06-30
EP0398116B1 (de) 1994-03-23
FR2646960A1 (fr) 1990-11-16

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