EP0538157B1 - Hybridschalter mit Axialblasspule - Google Patents

Hybridschalter mit Axialblasspule Download PDF

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Publication number
EP0538157B1
EP0538157B1 EP92420362A EP92420362A EP0538157B1 EP 0538157 B1 EP0538157 B1 EP 0538157B1 EP 92420362 A EP92420362 A EP 92420362A EP 92420362 A EP92420362 A EP 92420362A EP 0538157 B1 EP0538157 B1 EP 0538157B1
Authority
EP
European Patent Office
Prior art keywords
coil
contacts
circuit breaker
electrical circuit
cartridge
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
EP92420362A
Other languages
English (en)
French (fr)
Other versions
EP0538157A1 (de
Inventor
Roger Bolongeat-Mobleu
Olivier Cardoletti
Peter Malkin
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.)
Schneider Electric SE
Original Assignee
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0538157A1 publication Critical patent/EP0538157A1/de
Application granted granted Critical
Publication of EP0538157B1 publication Critical patent/EP0538157B1/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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6641—Contacts; Arc-extinguishing means, e.g. arcing rings making use of a separate coil
    • 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
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • H01H33/121—Load break switches
    • H01H33/122—Load break switches both breaker and sectionaliser being enclosed, e.g. in SF6-filled container

Definitions

  • the invention relates to a medium-voltage electrical circuit breaker comprising a sealed enclosure filled with a gas with high dielectric strength such as sulfur hexafluoride, a pair of main contacts disposed in said enclosure, a vacuum cartridge with a closed cylindrical envelope by two bottoms, disposed in said enclosure and containing a pair of aligned arcing contacts, electrically connected in parallel with said main contacts, a control mechanism for said contacts for opening the arcing contacts after the main contacts and closing them before the contacts main, and a coil producing an axial magnetic field in the arcing area, drawn inside the cartridge during the separation of the arcing contacts.
  • a gas with high dielectric strength such as sulfur hexafluoride
  • a known circuit breaker (documents FR-A-2,655,766 & EP-A-0 433 184) of the kind mentioned, comprises an axial blowing coil, incorporated into the cartridge and produced by notches made in the bottom of this cartridge.
  • the production of this part is delicate and only a fraction of the current flows through the spiral path constituting the coil.
  • the spectrum of the magnetic field generated by the coil is not ideal and the need has arisen to have a simplified device with improved performance.
  • the coil By placing the coil outside the vacuum cartridge, the internal parts of the latter are considerably simplified, and the coil can be placed in line with the contact separation interval to generate an ideal magnetic field in the area of break.
  • Vacuum cartridges having a coil outside the cartridge are already known, but the coil is always arranged around the cylindrical insulating envelope. The presence of this coil around the insulating envelope creates dielectric problems due to the capacitive shorting of the insulating envelope by the coil. It is moreover very difficult to rigidly fix this coil which is subjected to significant electromagnetic forces, the usual coating solution having the drawback of limiting the dissipation of the heat generated by the cartridge, and of increasing the size of the latter.
  • the coil in a housing, formed in the bottom of the cartridge overcomes the problems of mechanical fixing, and dielectric strength.
  • the arcing contacts of the vacuum cartridge are arranged in the center of the coil and the field generated by the latter is axial over the entire extent of the contacts.
  • the bottom receiving the coil is advantageously the bottom of the cartridge disposed on the side of the fixed contact and this bottom, made of a metallic or insulating material, is shaped like a bell covering with play the fixed arcing contact.
  • the section of the housing made in the bottom is of course adapted to the shape of the coil and this housing is open on the side of the fixed arcing contact to allow the insertion of the coil in this housing.
  • the assembly is cylindrical in shape and the external wall of the housing is extended to the vicinity of the end of the cartridge, where this external wall is connected to the insulating cylindrical envelope of the cartridge.
  • This keeps the insulation length of the vacuum cartridge, which is adapted to the dielectric strength in the hexafluoride sulfur.
  • the coil advantageously carries a single turn inserted with little play in the housing formed in the bottom, and having two ends respectively connected to the fixed arcing contacts and to the current supply, in this case to one of the main contacts. .
  • the ends of the coil contribute to the mechanical maintenance of the latter, and they extend parallel to the bell-shaped bottom, towards the axis of the cartridge to be mechanically fixed in contact with a fixed arc.
  • the electrical insulation of the power supply end is isolated by simple insulating washers and the two coil ends are slightly angularly offset to avoid electrical contact.
  • Figure 1 is a schematic view in axial section of a circuit breaker according to the invention.
  • FIG. 2 is an enlarged view of the vacuum cartridge according to FIG. 1.
  • FIG. 3 is a schematic plan view of the vacuum cartridge according to FIG. 2.
  • Figure 4 is a partial view of Figure 2, illustrating an alternative embodiment.
  • Figure 1 which corresponds substantially to the figure of the aforementioned French patent, illustrates the general structure of the hybrid circuit breaker comprising a sealed enclosure 10, filled with a gas with high dielectric strength, such as sulfur hexafluoride.
  • a gas with high dielectric strength such as sulfur hexafluoride.
  • the set is ordered by a mechanism 14 causing the opening of the main contacts 11,12 before the opening of the arcing contacts 15,16 of the vacuum cartridge 13.
  • the vacuum cartridge 13 comprises a cylindrical envelope 17 made of glass or of ceramic material closed off by two bottoms 18,19. Inside the cartridge 13 are arranged on the bottom side 19, the fixed contact 15, and on the bottom side 18, the movable contact 16 carried by the control rod 20 which crosses the bottom 18 in a sealed manner.
  • the arcing contacts 15 and 16 are disc-shaped in a material of high resistivity.
  • the bottom 19 has an annular groove 21 extending to the base of the separation gap of the arcing contacts 15, 16 in the open position. This groove 21 open upwards in FIG. 2 allows the insertion of an annular coil 22 which is housed in the bottom of the groove 21, so as to coaxially surround the separation interval of the contacts 15, 16.
  • the arcing contacts 15,16 are arranged in the center of the coil 22, and it is easy to see that the magnetic field generated by the current flowing through this coil 22 is axial over the entire extent of the arcing contacts 15.16.
  • the coil 22 is inserted with little play in the groove 21 which holds it mechanically.
  • the bottom 19 is bell-shaped covering the fixed arcing contact 15 and internally sheathing the coil 22, the lower edge 23 of this bell being curved to form a cylindrical wall 24 of external sheathing of the coil 22.
  • This external wall 24 can extend to the bottom 19, as shown in Figure 2 and connect at this location to the insulating cylindrical shell 17. The height of this outer wall 24 can also be reduced if the dielectric strength is sufficient .
  • the assembly has an axial symmetry and in a preferred embodiment, the bottom 18 associated with the movable contact has a shape similar to that of the bottom 19 associated with the fixed contact, the corresponding groove being in this case unused.
  • the bottoms 18.19 are metallic, and the insulation is ensured by the cylindrical envelope 17. It is clear that the bottoms 18 and or 19 can be insulating and contribute or ensure the holding dielectric of the cartridge 13 in sulfur hexafluoride.
  • the coil 22 is a single turn of rectangular section having two ends 25, 26, substantially parallel to the bottom 19 so as to leave the groove 21 and extend radially in the direction of the axis of the vacuum cartridge 13.
  • L end 25 is pressed against the fixed arcing contact 15 and has a hole 27 for the passage of a fixing screw 28.
  • the other end 26 arranged as a current supply conductor is superimposed on end 25, being insulated from the latter by insulating washers 29.
  • the screw 28 passes through an enlarged orifice 30 to secure by screwing in a threaded orifice the fixed arcing contact 15, the two ends 25, 26 to the fixed arcing contact 15.
  • the ends 25, 26 thus contribute to maintaining the turn 22 in the groove 21 in a particularly simple manner. It can be seen that the current supplied by the end 26 flows through the turn 22 before reaching the fixed arcing contact 15, and thus generates the axial magnetic field in the separation zone of the arcing contacts 15,16.
  • FIG. 4 illustrates an alternative embodiment in which the coil 22 is arranged at the bottom 19 with a slight upward offset, with respect to the separation interval of the arcing contacts 15, 16.
  • the spectrum of the magnetic field generated by the coil 22 is no longer absolutely ideal since it has a slight radial component, but the reduction in the depth of the groove 21 facilitates the production of the bottom 19.
  • the advantages of mechanical shrinking of the coil 22 are on the other hand entirely preserved.
  • the structure of the vacuum cartridge 13 is extremely simple.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Circuit Breakers (AREA)

Claims (7)

  1. Mittelspannungs-Leistungsschalter in einem dichtgekapselten, mit einem Gas hoher dielektrischer Festigkeit wie z.B. Schwefelhexafluorid gefüllten Gehäuse (10) mit zwei, in dem genannten Gehäuse (10) angeordneten Hauptkontakten (11, 12), einem im genannten Gehäuse (10) angeordneten Vakuumeinsatz (13) mit einer durch zwei Böden
       verschlossenen zylindrischen Umhüllung (17) und zwei fluchtend darin angeordneten, zu den genannten Hauptkontakten (11, 12) parallelgeschalteten Lichtbogenkontakten (15, 16), einem Schaltmechanismus (14) zur Betätigung der genannten Kontakte (11, 12, 15, 16), um die Lichtbogenkontakte (15, 16) nach den Hauptkontakten (11, 12) auszuschalten und vor den Hauptkontakten (11, 12) einzuschalten, sowie einer Spule (22) zur Erzeugung eines axialen Magnetfelds in der Abbrennzone des bei der Trennung der Lichtbogenkontakte (15, 16) im Innern des Vakuumeinsatzes (13) gezogenen Lichtbogens, dadurch gekennzeichnet, daß die genannte ringförmige Spule (22) im Innern des genannten Gehäuses (10), außerhalb des Vakuumeinsatzes (13) etwa in Höhe der in der Ausschaltstellung zwischen den Lichtbogenkontakten (15, 16) vorhandenen Trennstrecke koaxial angeordnet ist, daß der Durchmesser der Spule (22) geringer ist als der Durchmesser der genannten Umhüllung (17) und daß der an die Spule (22) angrenzende Boden (19) an die Form der Spule (22) angepaßt und dieser Spule zugeordnet ist, um ihre Innenseite abzudecken.
  2. Leistungsschalter nach Anspruch 1, dadurch gekennzeichnet, daß die Spule (22) und der zugeordnete Boden (19) auf der Seite des feststehenden Lichtbogenkontakts (15) angeordnet sind.
  3. Leistungsschalter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der der Spule (22) zugeordnete genannte Boden (19) eine ringförmige Aufnahme (21) umfaßt, die zur Seite des genannten Bodens (19) hin offen ist und einen geeigneten Querschnitt zum Einsetzen der Spule (22) in diese Aufnahme (21) aufweist, und daß die Innenwand der genannten Aufnahme (21) den genannten feststehenden Lichtbogenkontakt (15) unter Einhaltung eines für die elektrische Isolation ausreichenden Abstands koaxial umgibt.
  4. Leistungsschalter nach Anspruch 3, dadurch gekennzeichnet, daß die Außenwand (24) der genannten Aufnahme (21) mit der zylindrischen Umhüllung (17) des Vakuumeinsatzes (13) verbunden ist, die aus einem Isolierstoff besteht und eine für die dielektrische Festigkeit in Schwefelhexafluorid geeignete Länge aufweist.
  5. Leistungsschalter nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Spule (22) als Einzelwindung ausgeführt ist und ein erstes sowie ein zweites Ende (25, 26) aufweist, die um einen bestimmten Winkel versetzt parallel zu dem der Spule (22) zugeordneten genannten Boden (19) verlaufen, wobei das erste Ende (25) mechanisch und elektrisch mit dem feststehenden Lichtbogenkontakt (15) verbunden ist.
  6. Leistungsschalter nach Anspruch 5, dadurch gekennzeichnet, daß das zweite Ende (26) an einen der Hauptkontakte (11, 12) angeschlossen ist und dabei gleichzeitig mechanisch mit dem feststehenden Lichtbogenkontakt (15) verbunden und elektrisch gegen diesen isoliert ist.
  7. Leistungsschalter nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß die beiden Enden (25, 26) der Spule (22) in Höhe des feststehenden Lichtbogenkontakts (15) übereinander angeordnet sind und fluchtende Bohrungen zur Durchführung einer Schraube (28) aufweisen, die in den feststehenden Lichtbogenkontakt (15) eingedreht wird, wobei das erste Ende (25) mit dem Lichtbogenkontakt in Berührung steht, während das zweite Ende (26) durch Isolierstoffscheiben (29) elektrisch gegen das erste Ende (25) sowie gegen die Schraube (28) isoliert ist.
EP92420362A 1991-10-17 1992-10-14 Hybridschalter mit Axialblasspule Expired - Lifetime EP0538157B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9113063 1991-10-17
FR9113063A FR2682808B1 (fr) 1991-10-17 1991-10-17 Disjoncteur hybride a bobine de soufflage axial.

Publications (2)

Publication Number Publication Date
EP0538157A1 EP0538157A1 (de) 1993-04-21
EP0538157B1 true EP0538157B1 (de) 1996-04-17

Family

ID=9418216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420362A Expired - Lifetime EP0538157B1 (de) 1991-10-17 1992-10-14 Hybridschalter mit Axialblasspule

Country Status (10)

Country Link
US (1) US5280144A (de)
EP (1) EP0538157B1 (de)
JP (1) JPH05250965A (de)
KR (1) KR100267896B1 (de)
CN (1) CN1043547C (de)
AT (1) ATE137056T1 (de)
CA (1) CA2080518A1 (de)
DE (1) DE69209966T2 (de)
ES (1) ES2087494T3 (de)
FR (1) FR2682808B1 (de)

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KR102099359B1 (ko) 2013-07-08 2020-04-09 엘에스산전 주식회사 전자접촉기 접점부 오염 제거 장치
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Also Published As

Publication number Publication date
CA2080518A1 (en) 1993-04-18
KR100267896B1 (ko) 2000-10-16
EP0538157A1 (de) 1993-04-21
FR2682808A1 (fr) 1993-04-23
US5280144A (en) 1994-01-18
CN1071782A (zh) 1993-05-05
DE69209966T2 (de) 1996-09-26
JPH05250965A (ja) 1993-09-28
CN1043547C (zh) 1999-06-02
DE69209966D1 (de) 1996-05-23
FR2682808B1 (fr) 1997-01-24
KR930008893A (ko) 1993-05-22
ES2087494T3 (es) 1996-07-16
ATE137056T1 (de) 1996-05-15

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