EP0654808A1 - Autoexpansionsschalter mit Isoliergas - Google Patents

Autoexpansionsschalter mit Isoliergas Download PDF

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Publication number
EP0654808A1
EP0654808A1 EP94410104A EP94410104A EP0654808A1 EP 0654808 A1 EP0654808 A1 EP 0654808A1 EP 94410104 A EP94410104 A EP 94410104A EP 94410104 A EP94410104 A EP 94410104A EP 0654808 A1 EP0654808 A1 EP 0654808A1
Authority
EP
European Patent Office
Prior art keywords
contacts
circuit breaker
contact
tube
chamber
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.)
Ceased
Application number
EP94410104A
Other languages
English (en)
French (fr)
Inventor
Stephen Rowe
Paul Glenat
Pierre Leclercq
Daniel Perret
Jean-Claude Faye
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.)
Merlin Gerin SA
Schneider Electric SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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 Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0654808A1 publication Critical patent/EP0654808A1/de
Ceased 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
    • H01H33/982—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 in which the pressure-generating arc is rotated by a magnetic field

Definitions

  • the exhaust of the hot gases coming from the breaking chamber towards the expansion chamber takes place through the sectioning contacts.
  • the arc is extinguished in the breaking chamber before the separation contacts are separated.
  • breaking of currents of moderate intensities it is possible that two arcs are in series, the first in the breaking chamber between the arcing contacts, the second in the expansion chamber between the isolating contacts .
  • the presence of ionized gases in the interval between the isolating contacts may lead to degradation of the dielectric strength.
  • the arc extinction time during the opening of the circuit breaker is then relatively long, for example greater than 60 ms.
  • the object of the invention is to reduce the breaking time of a self-expanding circuit breaker, regardless of the intensity of the current to be interrupted.
  • the circuit breaker according to the invention is characterized in that a closure means is housed in the second tube above the second isolating contact, and that discharge orifices are provided in the second tube upstream of the means d 'shutter to divert the first gas flow from the shutdown chamber to the expansion chamber without crossing the isolation gap.
  • the expansion chamber contains blowing means made operational during the opening stroke of the isolating contacts, for injecting a second jet of cold gas in the meantime.
  • Figure 1 is a schematic view in axial section of a self-expanding circuit breaker according to the invention, the left half-view showing the circuit breaker in the closed position, and the right half-view showing the circuit breaker at the end of travel opening.
  • FIG. 2 is a detail view on an enlarged scale of the main and sectioning contacts of the circuit breaker of FIG. 1.
  • Figure 3 shows an identical view of Figure 2 of an alternative embodiment.
  • a pole 10 of a high-voltage autoexpansion circuit breaker in particular greater than 100 kV, comprises a sealed casing 12 filled with SF6 gas, and subdivided into a breaking chamber 14, and an expansion chamber 16.
  • the envelope 12 has a tubular shape having two opposite bottoms 18, 20 made of conductive material constituting the two current supply areas of the pole 10.
  • the breaking chamber 14 contains a fixed arcing contact 22 secured to the front surface of an electromagnetic induction coil 24, and a movable arcing contact 26 cooperating with the fixed arcing contact 22 in the closed position of the circuit breaker.
  • the interrupting chamber 14 is arranged in the upper part of the casing 12, the coil 24 and fixed arcing contact 22 assembly being electrically connected to the bottom 18 constituting the first current supply range.
  • the movable arcing contact 26 is carried at the end of a first conductive tube 28 mounted to slide axially through a first insulating wall 30.
  • the expansion chamber 16 is placed coaxially in the lower part of the casing 12 and communicates with the breaking chamber 14 via the first tube 28 during the separation of the arcing contacts 22, 26.
  • the chamber d expansion 16 contains a fixed main contact 32 located at the potential of the upper bottom 18, and a movable main contact 34 electrically connected to the lower bottom 20.
  • the movable main contact 34 is carried by a support member or end piece 36 tubular and conductor made integral a control rod 38 slidably mounted in a conductive tube 40 fixed to the bottom 20.
  • the end piece 36 also comprises a first tubular sectioning contact 42, arranged coaxially inside the movable main contact 34, and cooperating with a second tubular sectioning contact 44 carried at the lower end of a second conductive tube 46.
  • a first return spring 48 is arranged between the wall 30 and a radial stop 50 of the second tube 46, so as to push the latter down by causing the two cutting contacts 42, 44 to abut in the closed position (see half-view on the left in figure 1).
  • the expansion chamber 16 is separated from the interrupting chamber 14 by an intermediate space 52 delimited by the first wall 30 and a second parallel wall 54.
  • a central orifice in the second wall 54 is crossed coaxially by the two telescopic tubes 28, 46.
  • the second outer tube 46 has at its upper end a lug 56 for driving intended to cooperate with a radial flange 58 of the first internal tube 28.
  • a second spring 62 which tends to separate the two tubes 28, 46 longitudinally from one another.
  • the main contacts 32, 34 and the isolating contacts 42, 44 are located inside the expansion chamber 16, while the arcing contacts 22, 26 are permanently arranged in the breaking chamber 14.
  • the volume of the expansion chamber 16 is significantly greater than that of the breaking chamber 14.
  • the current enters through the first current supply range 18, travels through the main contacts 32, 34 and exits through the second range 20.
  • a very low current current flows in the impedant circuit of the coil 24, in series with the arcing contacts 22, 26 and sectioning 42, 44 which are closed.
  • the control rod 38 is pulled down by the action of a mechanism (not shown).
  • the translational movement of the rod 38 drives the end piece 36 in the same direction, and the second tube 46 follows this movement to keep the isolating contacts 42, 44 closed.
  • the first tube 28 remains stationary thanks to the second spring 62, so as to keep the arcing contacts 22, 26 in the closed position.
  • the main contacts 32, 34 separate, with current switching in the circuit of the coil 24 in series with the arcing contacts 22, 26, and the isolating contacts 42, 44.
  • the coming in engagement of the lug 56 against the flange 58 subsequently drives the first tube 28 downwards, which causes the separation of the arcing contacts 22, 26.
  • the electric arc drawn between the arcing contacts 22, 26 is rotated by the magnetic field created by the coil 24, and simultaneously causes a rise in pressure of the SF6 gas inside the breaking chamber 14. It gas flows through the first tube 28 towards the expansion chamber 16, followed by the extinction of the arc when the stop 50 comes to bear against the upper face of the second wall 54.
  • the second tube 46 then remains stationary, and the continued movement of descent of the control rod 38 generates the separation of the sectioning contacts 42, 44 until a sufficient insulation gap 66 is obtained (see half-view on the right on figure 1).
  • the hot gases from the interrupting chamber 14 are discharged to the expansion chamber 16 through the two tubes 28, 46 telescopic.
  • the second tube 46 is plugged by a closure means 68 located above the second sectioning contact 44.
  • Evacuation orifices 70 are provided in the second tube 46 upstream of the closure means 68 to force the flow of hot gases towards the expansion chamber 16 in the direction of the arrow F1. These hot gases do not pass through the insulation gap 66, which is particularly favorable for a rapid restoration of the dielectric strength of the medium between the isolation contacts 42, 44.
  • the arc extinction time is in the range of thirty five to fifty milliseconds.
  • the dielectric recovery of the medium between the isolating contacts 42, 44 can be further improved by the use of blowing means 72 intended to inject an additional jet of cold gas towards the isolation interval 66.
  • the blowing means 72 comprise a fixed piston 74 on which the tubular end piece 36 can slide serving as a movable cylinder.
  • the separation of the isolating contacts 42, 44 during the downward movement of the moving element brings the closing means 68 closer to the piston 74, with a gas compression effect in the region of the isolating contacts 42 , 44.
  • the isolation gap 66 is subjected to a radial flow of fresh gas (arrow F2) intended to extinguish the arc between the isolating contacts 42, 44 with a rapid restoration of the dielectric strength.
  • the arc extinction time is less than thirty milliseconds.
  • the pistonable volume of the compression device is delimited by the fixed piston 74 and the sealing means 68 of the second tube 46.
  • the tubular end piece of the support member 36 has a diameter close to that of the sectioning contacts 42, 44.
  • blowing means 72 by compression of the SF6 gas can be arranged differently without departing from the scope of the invention.

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  • Circuit Breakers (AREA)
EP94410104A 1993-11-24 1994-11-18 Autoexpansionsschalter mit Isoliergas Ceased EP0654808A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9314146 1993-11-24
FR9314146A FR2713014B1 (fr) 1993-11-24 1993-11-24 Disjoncteur à gaz isolant et à autoexpansion.

Publications (1)

Publication Number Publication Date
EP0654808A1 true EP0654808A1 (de) 1995-05-24

Family

ID=9453242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94410104A Ceased EP0654808A1 (de) 1993-11-24 1994-11-18 Autoexpansionsschalter mit Isoliergas

Country Status (3)

Country Link
EP (1) EP0654808A1 (de)
JP (1) JPH07201258A (de)
FR (1) FR2713014B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116153734A (zh) * 2023-03-07 2023-05-23 西安西电开关电气有限公司 一种灭弧室及其工作方法
CN121237601A (zh) * 2025-12-01 2025-12-30 沈阳晨源电气有限公司 一种真空柱上断路器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2459543A1 (fr) * 1979-06-15 1981-01-09 Alsthom Cgee Disjoncteur a haute tension a arc tournant et autosoufflage
FR2479553A1 (fr) * 1980-03-28 1981-10-02 Merlin Gerin Interrupteur a arc tournant et a expansion thermique du gaz de soufflage
EP0298809A1 (de) * 1987-07-02 1989-01-11 Merlin Gerin Selbstbeblasender elektrischer Lastschalter mit rotierendem Lichtbogen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2459543A1 (fr) * 1979-06-15 1981-01-09 Alsthom Cgee Disjoncteur a haute tension a arc tournant et autosoufflage
FR2479553A1 (fr) * 1980-03-28 1981-10-02 Merlin Gerin Interrupteur a arc tournant et a expansion thermique du gaz de soufflage
EP0298809A1 (de) * 1987-07-02 1989-01-11 Merlin Gerin Selbstbeblasender elektrischer Lastschalter mit rotierendem Lichtbogen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116153734A (zh) * 2023-03-07 2023-05-23 西安西电开关电气有限公司 一种灭弧室及其工作方法
CN121237601A (zh) * 2025-12-01 2025-12-30 沈阳晨源电气有限公司 一种真空柱上断路器

Also Published As

Publication number Publication date
FR2713014B1 (fr) 1996-01-12
FR2713014A1 (fr) 1995-06-02
JPH07201258A (ja) 1995-08-04

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