EP0627751A1 - Lastschalter mit doppelter Lichtbogenverlängerung zum Auslösen von Stromen mit grosse Gleichstromkomponente - Google Patents

Lastschalter mit doppelter Lichtbogenverlängerung zum Auslösen von Stromen mit grosse Gleichstromkomponente Download PDF

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Publication number
EP0627751A1
EP0627751A1 EP94401207A EP94401207A EP0627751A1 EP 0627751 A1 EP0627751 A1 EP 0627751A1 EP 94401207 A EP94401207 A EP 94401207A EP 94401207 A EP94401207 A EP 94401207A EP 0627751 A1 EP0627751 A1 EP 0627751A1
Authority
EP
European Patent Office
Prior art keywords
contact
arc
current
tube
fixed
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.)
Withdrawn
Application number
EP94401207A
Other languages
English (en)
French (fr)
Inventor
Van Doan Pham
Joseph Martin
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.)
Grid Solutions SAS
Original Assignee
GEC Alsthom T&D 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 T&D SA filed Critical GEC Alsthom T&D SA
Publication of EP0627751A1 publication Critical patent/EP0627751A1/de
Withdrawn legal-status Critical Current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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • 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
    • H01H33/006—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means adapted for interrupting fault currents with delayed zero crossings
    • 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
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas

Definitions

  • the present invention relates to the breaking of currents with a large DC component, which is encountered, for example, in high-voltage alternating networks with series compensation, when certain types of faults appear.
  • the presence of the DC component can cause the current to pass through zero for several periods. It is therefore difficult to cut off the power using conventional sulfur hexafluoride (SF6) circuit breakers.
  • SF6 sulfur hexafluoride
  • An object of the present invention is to provide a circuit breaker capable of creating a high arc voltage, using the SF6 circuit breakers existing on the market, with a minor modification and at low cost;
  • the basic idea is to configure the arcing contacts so that the current crosses them, in at least part of their length, in the opposite direction to the arcing current. In this way, on each of these contacts, a current loop is created, which, under Lenz's law, tends to enlarge, so that the roots of the arc are pushed away from the ends of the contacts. arc.
  • the arc is thus doubly elongated which, as explained above, promotes the disappearance of the DC component of the current.
  • the invention thus relates to a circuit breaker as described in the claims.
  • the oscillogram of FIG. 1 shows the fault current with the delayed current passing through zero.
  • the arc To advance the zero crossing of the current, the arc must therefore be extended to the maximum possible as soon as the arcing contacts are separated.
  • Figure 2 is a schematic view in axial section of a breaking chamber of a pole of a conventional circuit breaker, shown in the tripped position. It comprises an envelope 1, made of insulating material such as ceramic, closed by two metal flanges 2 and 3 carrying sockets 2A and 3A. The volume 4 thus delimited is filled with a gas with good dielectric properties such as sulfur hexafluoride SF6 or nitrogen, under a pressure of a few hectopascals.
  • a gas with good dielectric properties such as sulfur hexafluoride SF6 or nitrogen, under a pressure of a few hectopascals.
  • a fixed assembly Inside the envelope are arranged a fixed assembly and a movable assembly.
  • the fixed assembly comprises metal arms 5 mechanically and electrically connected to the flange 2 and supporting a contact 6 for the passage of the permanent current and an arcing contact 7.
  • Contact 6 is a tube; the contact 7 is also tubular and will be described in detail with reference to FIG. 3.
  • the mobile assembly comprises a cylinder 9, one end of which carries a metal crown 10; the cylinder is connected to an insulating rod 11 which passes tightly through the flange 3 and which is connected to a control not shown.
  • the ring 10 carries contact fingers 12 for the passage of the permanent current and which cooperate, when the circuit breaker is closed, with the tube 6.
  • the fingers 12 are protected by a corona hood 12A fixed to the cylinder 9.
  • the crown 10 carries a blowing nozzle 17 preferably made of insulating material.
  • the piston 18, the crown 10 and the cylinder 9 define a blowing volume V.
  • the crown 10 carries holes 10A to allow the gas of volume V, compressed during an opening operation of the circuit breaker, to escape through the nozzle to blow the arc.
  • Figure 3 shows the specific constitution of the arcing contacts, allowing the arc to be extended twice.
  • the fixed arcing contact generally designated by the reference 7, comprises two coaxial tubular metal portions 50 and 51, separated by an insulating layer 52, for example made of Teflon.
  • the portions 50 and 51 are joined at their end by a metal tip 49 made of an alloy resistant to the effects of the electric arc, for example based on tunstene (wolfram).
  • the tubular portion 51 is intended to cooperate with the fingers 14 of the movable assembly. It is terminated at the end opposite to the end piece by an annular bead 54.
  • the tubular portion 50 is coated internally, over a certain length, from the end piece 49, by an insulating layer 53, for example made of teflon.
  • the tube carrying the fingers of the movable arcing contact consists of two coaxial metal portions 57 and 60, isolated from each other by an insulating layer 59, and joined to a end by a tip 56 made of metal alloy resistant to the effects of electric arc.
  • the layer 57 is terminated, at its end opposite the end piece 56, by an annular bead 58.
  • the main fingers 12 are supported on the metal tube 6
  • the arcing fingers 14 are supported on the metal tube 51.
  • the arc moves from the fingers 14 to the nozzle 56, especially if the current is in the downward phase A of current reduction (see Fig. 1).
  • the current in the arc is of opposite direction to the current in the zone 57A of the tube 57.
  • the loop effect (law of the maximum induction flux or Lenz's law) tends to move the root of the arc 62A along the interior surface of the tube 57 to the bead 58.
  • the blowing of the gas pushes the root of the arc 62B of the nozzle 49 towards the external end region 51A of the tube 51.
  • the current in 51A is of direction opposite that of arc 62B; the loop effect pushes the root of the arc along the outer surface of the tube 51 to the bead 54, especially if the current is in the downward phase A or in the downward phase B.
  • This current has an intensity of several millirs of amperes.
  • the insulating layer 53 prevents the arc from catching on the interior surface of the tube 50.
  • an insulating layer 55 is placed on the interior surface of this tube.
  • the double elongation of the arc, on the fixed side and on the movable side, makes it possible to obtain a large arc voltage which, by its intrinsic resistance, makes it easier for the DC component to decrease, to force a zero crossing, either by t1, or in t2, depending on the value of the current and the duration of the arc.
  • the invention makes it possible, by means of an inexpensive adaptation of existing circuit breakers, to obtain a device perfectly suited to breaking currents with a large DC component.

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  • Circuit Breakers (AREA)
EP94401207A 1993-06-03 1994-06-01 Lastschalter mit doppelter Lichtbogenverlängerung zum Auslösen von Stromen mit grosse Gleichstromkomponente Withdrawn EP0627751A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9306661A FR2706073B1 (fr) 1993-06-03 1993-06-03 Disjoncteur à double allongement d'arc pour la coupure des courants à grande composante continue.
FR9306661 1993-06-03

Publications (1)

Publication Number Publication Date
EP0627751A1 true EP0627751A1 (de) 1994-12-07

Family

ID=9447727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401207A Withdrawn EP0627751A1 (de) 1993-06-03 1994-06-01 Lastschalter mit doppelter Lichtbogenverlängerung zum Auslösen von Stromen mit grosse Gleichstromkomponente

Country Status (2)

Country Link
EP (1) EP0627751A1 (de)
FR (1) FR2706073B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7617505U1 (de) * 1976-05-28 1980-02-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kontaktanordnung fur Druckgasschalter
EP0039523A1 (de) * 1980-05-07 1981-11-11 BBC Aktiengesellschaft Brown, Boveri & Cie. Hochspannungsleistungsschalter
DE9016830U1 (de) * 1990-12-10 1991-02-28 Siemens AG, 8000 München Hochspannungs-Leistungsschalter
FR2681724A1 (fr) * 1991-09-24 1993-03-26 Alsthom Gec Disjoncteur haute tension a grande tension d'arc.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7617505U1 (de) * 1976-05-28 1980-02-07 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kontaktanordnung fur Druckgasschalter
EP0039523A1 (de) * 1980-05-07 1981-11-11 BBC Aktiengesellschaft Brown, Boveri & Cie. Hochspannungsleistungsschalter
DE9016830U1 (de) * 1990-12-10 1991-02-28 Siemens AG, 8000 München Hochspannungs-Leistungsschalter
FR2681724A1 (fr) * 1991-09-24 1993-03-26 Alsthom Gec Disjoncteur haute tension a grande tension d'arc.

Also Published As

Publication number Publication date
FR2706073B1 (fr) 1995-07-07
FR2706073A1 (fr) 1994-12-09

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