EP0025375B1 - Schalter mit magnetischer Blasvorrichtung und rotierendem Lichtbogen - Google Patents

Schalter mit magnetischer Blasvorrichtung und rotierendem Lichtbogen Download PDF

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Publication number
EP0025375B1
EP0025375B1 EP19800401181 EP80401181A EP0025375B1 EP 0025375 B1 EP0025375 B1 EP 0025375B1 EP 19800401181 EP19800401181 EP 19800401181 EP 80401181 A EP80401181 A EP 80401181A EP 0025375 B1 EP0025375 B1 EP 0025375B1
Authority
EP
European Patent Office
Prior art keywords
coil
arc
rods
core
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
Application number
EP19800401181
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English (en)
French (fr)
Other versions
EP0025375A1 (de
Inventor
Olivier Bouilliez
Denis Raphard
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
Original Assignee
Merlin Gerin 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 Merlin Gerin SA filed Critical Merlin Gerin SA
Publication of EP0025375A1 publication Critical patent/EP0025375A1/de
Application granted granted Critical
Publication of EP0025375B1 publication Critical patent/EP0025375B1/de
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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

Definitions

  • the invention relates to a magnetic blow switch in rotation of the arc as defined in the preamble of claims 1 and 3.
  • GB-A-479 097 It is also known (GB-A-479 097) to reinforce the magnetic blowing field in rotation of the arc by a ferromagnetic core inserted in the blowing coil. To ensure the proper functioning of the switch, it is essential to guide the movement of the arc to keep it in the optimal magnetic blowing zone, the arc being substantially perpendicular to the blowing field. To do this, the arc must be maintained on a relatively narrow migration path from the opposite arc root and attached to the end face of the coil.
  • the switch described in the aforementioned document GB-A-479 097 comprises a wide disc-shaped track covering the coil and the core and the arc can migrate towards the central zone with reduced blow.
  • the core is permanently connected in series with the coil which decreases the intensity of the current in the coil.
  • FR-A-2 285 700 Another known switch (FR-A-2 285 700) comprises a circular arc track externally surrounding a main contact with the interposition of an insulating screen between the main contact and the arc track.
  • a magnetic core is arranged inside the blowing coil coming in slight projection from the latter on the side of the arc track, the core of which is spaced.
  • the core is electrically connected to the main contact and in case of arcing on the core the coil is short-circuited.
  • the document FR-A-2 414 786 relates to a switch having a blowing coil with a front face entirely covered by a circular electrode in the shape of a disc.
  • This wide electrode has the aforementioned drawbacks of migration from the arc to the weak magnetic blowing zone.
  • This part is capped with an insulating material harmful to the extinction of the arc.
  • the magnetic core at the back of the electrode is away from the arc area.
  • the object of the present invention is to remedy these drawbacks and as characterized in claims 1 and 3.
  • a cylinder head externally surrounds the blowing coil, so as to increase the magnetic blowing field in the zone of formation and extinction of the arc.
  • the combined action of the inner core and the outer cylinder head provides a sufficient blowing field even during a low current cut.
  • a switch in the figures, includes an elongated waterproof insulating envelope 10 filled with sulfur hexafluoride under pressure, for example a few bars. Inside the casing 10 are housed a set 12 of fixed contacts and a set of movable contacts 14 mounted for axial sliding and controlled by an oscillating arm 15 for controlling a control mechanism (not shown in FIG. 1), but which may be of the type described in the aforementioned document FR-A-2 339 244, to which reference will advantageously be made for further details.
  • the movable contact assembly 14 comprises a movable main contact 16 in the form of a cup, the annular end 18 of which faces the fixed contact assembly 12 is arranged in the migration path of an arc root.
  • the bowl 16 is fixed at its base to a sliding control rod 20 secured by a slide 22 to the control arm 15. Inside the bowl contact 16 is semi-fixed an arcing contact 24 having an annular electrode 26 forming an annular arc migration track.
  • the arcing contact 24 is biased in the abutment position against a collar 28 in the direction of the set of fixed contacts 12 by a spring 30. In the abutment position the annular electrode track 26 of the arcing contact 24 is substantially at level of the annular end 18 of the movable main contact 16.
  • the set of fixed contacts 12 is secured to the bottom 32 of the insulating casing 10 by a bracket 34 having a fixing plate 36, which has a central orifice for the passage of a ferromagnetic core 38 and orifices distributed over a circumference surrounding the core 38.
  • the set of fixed contacts 12 essentially comprises a fixed arcing contact 42 in the form of an annular track capable of cooperating by abutment with the movable arcing contact 24 of the same configuration, a tubular blowing coil 44 and a fixed main contact 46 having an annular contact face capable of cooperating by abutment with the main movable contact 16.
  • a yoke 48 made of ferromagnetic material, which matches the shape of the contact main 46 by laterally surrounding the coil 44.
  • the end face 50 of the core 38 is substantially at the level of the fixed arcing contact 42, the ends of the main fixed contact 46 and of the yoke 48 being slightly set back relative to the fixed arcing contact 42. It is easy to see that the yoke 48 and the core 38, which passes through it, constitute a magnetic sheathing circuit of the tubular coil 44 having an air gap in the contact zone between the movable arcing contact 24 and the fixed arcing contact 42.
  • the coil 44 is constituted by a stack, described in detail below with reference to FIGS. 2 and 3, crossed by the clamping rods or tie rods 40.
  • the latter are fixed by one of their ends to the annular track, for example by welding and successively pass through orifices formed in a phase shift ring 52, in the coil 44, in the cylinder head 48, in the fixed main contact 46, in the clamp 34 and in a plate 54 for supporting the core 38.
  • Nuts 56 screwed onto the threaded ends of the tie rods 40 keep the constituent parts of the fixed contact assembly 12 assembled.
  • the phase-shifting ring 52 of large section covers almost all of the front face of the coil 44 against which it is applied by being inserted between this front face and the annular track.
  • the outer edge 58 of the phase shift ring 52 is chamfered to limit the risk of arcing on the adjacent main contact 46.
  • the tie rods 40 and the support plate 54 are electrically isolated from the coil 44, from the fixed main contact 46 and from the stirrup 34 by insulating sleeves 60 with flange 62 threaded on the tie rods 40.
  • the insulating casing 10 has at its upper part a connection bushing 64 electrically connected to the stirrup 34 and at its lower part a bushing 66 electrically connected by a flexible conductor 68 to the set of movable contacts 14. Braids 70, described below, electrically connect the movable arcing contact 24 to the movable main contract 16.
  • the core 38 mechanically and electrically secured by the plate 54 and the tie rods 40 to the annular track, is at the same potential of the latter and in the event of arcing on the end face 50 of the core 38 the current borrows a circuit constituted by the core 38, the plate 54, the tie rods 40, the arcing contact track 42 and the coil 44, keeping the latter energized. Any initiation of the arc on the core 38 keeps the blowing in rotation of the arc favoring its extinction.
  • the chamfer 58 of the phase shift ring 52 prevents any migration of the arc to the main contact 46 and any ignition thereon.
  • the coil 44 generates both a blowing field of the switching arc drawn between the main contacts 16, 46 and of the cutting arc drawn between the annular tracks (arcing contacts 26, 42).
  • FIGS. 2 and 3 which show the coil 44
  • the phase shift ring 52 and the tie rods 40 on which are insulated inserts 72 and split conductive discs 74 alternately.
  • the inserts 72 and the slotted discs 74 have holes for the passage of the tie rods 40 and they are placed so as to angularly offset the slots 76 of the successive conductive discs 74.
  • the coil 44 is crossed by six tie rods 40 distributed regularly and each conductive disc 74 is angularly offset by a sixth of a turn, in this case 60 ° relative to the adjacent disc 74.
  • each insulating insert 72 is inserted a metal washer 78 capable of ensuring a contact bridge between the adjacent conductive discs 74.
  • the washers 78 of the successive inserts are offset by the same angle as the offset of the slots 76, a washer 78 being always framed by the slots 76 of the two adjacent conductive discs 74. It can be seen that in the assembled and compressed position of the discs 74 and spacers 72 the current flows from a disc 74 to the next disc by the washers 78 forming a contact bridge, this current describing a propeller whose successive turns are each formed by one of the conductive discs 74.
  • the coil 44 may include any number of discs 74 and spacers 72.
  • the washers 78 and in particular the washer interposed between the last disc 74 and the phase shift ring 52 can have a certain elasticity, imparted by their Belleville type structure.
  • the elasticity of the Belleville washers makes it possible to compensate for thermal expansions, in particular the elongation of the tie rods 40 and avoids any interruption in the electrical continuity between the successive discs 74.
  • the production of such a coil is particularly simple and the - tie rods 40 effectively oppose the repulsion forces which are exerted between the turns and the phase shift ring 52 when the coil 44 is traversed by an intense current, in particular a short circuit.
  • Fig. 3 illustrates the mode of electrical connection between the movable arcing contact 24 and the movable main contact 16 in the form of a bowl.
  • the connection braids in the example shown in fig. 3, the pair of braids 70, are on the one hand fixed by one of their ends to the internal wall of the bowl 16, for example by screws 80, the opposite end being fixed to a finger 82 carried by the movable contact 24.
  • the braids 70 extend along the periphery of the bowl 16 with sufficient clearance for the relative movement of the movable arcing contact 24. It is easy to see that the braids 70 come to be applied under the loop effect against the internal wall of the main contact 16, when they are traversed by a current, the contact 16 limiting the deformation of these braids 70.
  • the contact 16 constitutes a hoop preventing any excessive deformation.
  • the switch disconnection assembly according to the invention is particularly simple and its manufacturing and mounting cost is low.
  • the addition of main contacts ensures reliable electrical contact.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (6)

1. Schalter mit magnetischer Blasung in Rotation des Lichtbogens bestehend aus:
- einem Paar trennbarer Kontakte (24, 42), die je eine ringförmige Elektrode haben, welche einen Laufring des Fusspunktes eines bei der Trennung der genannten Kontakte gezogenen Lichtbogens bildet,
- einer koaxial zu den genannten Elektroden rohrförmigen Spule (44), deren Endfläche (52) an einer der genannten ringförmigen Elektroden auf der Gegenseite des Laufringes anliegt, wobei die genannte Spule (44) einerseits elektrisch mit einem der Anschlüsse (64, 66) des Schalters und andererseits mit der anliegenden Elektrode so verbunden ist, dass sie elektrisch in Serie mit dem auf der anliegenden Elektrode laufenden Lichtbogen gespeist wird und ein radiales Magnetfeld in der Zone des genannten Lichtbogens erzeugt,
- einem ferro-magnetischen leitenden Kern (38), der sich koaxial im Innern der Spule (44) zur Verstärkung des magnetischen Blasfeldes des genannten Lichtbogens erstreckt, wobei die in der Nähe von der genannten anliegenden Elektrode stehende Endfläche (50) des Kernes (38) durch einen freien Raum von dieser getrennt ist,

. dadurch gekennzeichnet, dass der genannte Kern (38) elektrisch mit der genannten anliegenden Elektrode verbunden ist.
2. Schalter nach Anspruch 1, gekennzeichnet durch Tragstangen (40) der genannten anliegenden Elektrode, die sich parallel zur Spulenachse (44) erstrecken und durch mechanische und elektrische Verbindungsmittel (54) des genannten Kernes (38) und der freien Enden dieser Stangen (40) die sich-auf der Gegenseite der Lichtbogenzone befinden.
3. Schalter mit magnetischer Blasung bestehend aus einem Paar trennbarer Kontakte (24, 42), einer ringförmigen einem der genannten Kontakte zugeordneten Elektrode und einer rohrförmigen koaxial neben der genannten ringförmigen Elektrode liegenden Spule (44), dadurch gekennzeichnet, dass die genannte Spule (44) besteht aus:
- einem Stapel von ringförmigen gespalteten leitenden Scheiben (74), die je eine Windung der Spule bilden, und isolierende Zwischenlagen (72), die die elektrische Isolierung zwischen den aufeinanderfolgenden Scheiben (74) bilden, wobei die aufeinanderfolgenden Scheibenspalten (76) winkelig längs einer Schraube versetzt sind,
- Kontaktbrücken (78), die zwischen aufeinanderfolgenden Scheiben eingefügt sind une von den Spalten der anliegenden Scheiben (74) umrahmt sind,
- und Anziehstangen (40) des genannten Stapels, die in den Scheiben (74) und in den Zwischenlagen (72) in Reihe liegende Löcher durchqueren, und die ringförmig verteilt sind, um den elektrischen Kontaktdruck zwischen Scheiben (74) und den genannten Kontaktbrücken (78) zu bilden.
4. Schalter nach Anspruch 3, dadurch gekennzeichnet, dass die genannten Kontaktbrücken (78) aus auf die Anziehstangen gefädelte Federringen bestehen, die die thermischen oder mechanischen Dehnungen elastisch ausgleichen und in Löcher der Zwischenlagen (72) von entsprechender Grösse eingefügt sind.
5. Schalter nach Anspruch 1 und nach Anspruch 3 oder 4, gekennzeichnet durch Stangen (40), die an einem Ende an einer ringförmigen auf der Endfläche der Spule (44) anliegenden Elektrode befestigt sind, wobei die genannten Stangen (40) durch Löcher den genannten Stapel durchkreuzen und an dem ferro-magnetischen Kern (38) an der gegenüberliegenden Seite befestigt sind, um zugleich Tragstangen der Elektrode und Anziehstangen des Spulenstapels zu bilden.
6. Schalter nach Anspruch 5, dadurch gekennzeichnet, dass ein magnetisches Eisen (48) die Aussenseite der Spule (44) umschliesst und zusammen mit dem Kern (38) und der Spule (44) durch die genannten Stangen (40) an einem Träger (36) befestigt ist.
EP19800401181 1979-09-03 1980-08-12 Schalter mit magnetischer Blasvorrichtung und rotierendem Lichtbogen Expired EP0025375B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7922151 1979-09-03
FR7922151A FR2464550A1 (fr) 1979-09-03 1979-09-03 Interrupteur a soufflage magnetique en rotation de l'arc

Publications (2)

Publication Number Publication Date
EP0025375A1 EP0025375A1 (de) 1981-03-18
EP0025375B1 true EP0025375B1 (de) 1984-07-18

Family

ID=9229359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401181 Expired EP0025375B1 (de) 1979-09-03 1980-08-12 Schalter mit magnetischer Blasvorrichtung und rotierendem Lichtbogen

Country Status (5)

Country Link
EP (1) EP0025375B1 (de)
JP (1) JPS5636817A (de)
DE (1) DE3068593D1 (de)
DK (1) DK158425C (de)
FR (1) FR2464550A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
YU173582A (en) * 1981-09-16 1985-03-20 Bbc Brown Boveri & Cie Electrical switch
JPH021919U (de) * 1988-06-17 1990-01-09

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB375308A (en) * 1931-03-18 1932-06-20 Electr & Allied Ind Res Ass Improvements relating to electric switches and circuit breakers
US2154515A (en) * 1936-05-29 1939-04-18 Westinghouse Electric & Mfg Co Circuit breaker
GB479097A (en) * 1936-07-29 1938-01-31 Ellison George Ltd Improvements relating to electric circuit breakers having arc-suppressing means
US2439952A (en) * 1944-08-31 1948-04-20 Westinghouse Electric Corp Circuit interrupter
CH298774A (de) * 1951-03-22 1954-05-15 Ceskoslovenske Z Tezkeho Stroj Elektrischer Schalter.
JPS50121775A (de) * 1974-03-14 1975-09-23
FR2285700A1 (fr) * 1974-09-19 1976-04-16 Alsthom Cgee Dispositif de coupure
JPS5921130B2 (ja) * 1976-01-23 1984-05-17 日新電機株式会社 ガスしや断器
US4255631A (en) * 1978-01-11 1981-03-10 Gould Inc. Exterior connected arc runner for arc spinner interrupter

Also Published As

Publication number Publication date
DK158425B (da) 1990-05-14
EP0025375A1 (de) 1981-03-18
DK373580A (da) 1981-03-04
FR2464550A1 (fr) 1981-03-06
FR2464550B1 (de) 1982-02-05
DE3068593D1 (en) 1984-08-23
DK158425C (da) 1990-10-22
JPS5636817A (en) 1981-04-10

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