EP3132460B1 - Drehbogenschutzschalter mit einer feldspule mit hohem widerstand - Google Patents

Drehbogenschutzschalter mit einer feldspule mit hohem widerstand Download PDF

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Publication number
EP3132460B1
EP3132460B1 EP15716505.1A EP15716505A EP3132460B1 EP 3132460 B1 EP3132460 B1 EP 3132460B1 EP 15716505 A EP15716505 A EP 15716505A EP 3132460 B1 EP3132460 B1 EP 3132460B1
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EP
European Patent Office
Prior art keywords
contact
coil
ring
inducer
plate
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.)
Active
Application number
EP15716505.1A
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English (en)
French (fr)
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EP3132460A1 (de
Inventor
Sébastien Silvant
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.)
GE Vernova GmbH
Original Assignee
General Electric Technology GmbH
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Filing date
Publication date
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Publication of EP3132460A1 publication Critical patent/EP3132460A1/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
    • H01H33/185—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
    • 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 invention relates to a gas-insulated rotating arc high-voltage circuit breaker.
  • the invention relates to a rotating arc circuit breaker comprising a fixed contact support and a movable contact support spaced from one another and carrying a fixed contact and a movable contact in translation, as well as an inductor located in a chamber. cutoff containing an insulating gas such as SF6.
  • the document US 4918268 discloses an electrical breaking device according to the preamble of claim 1.
  • the inductor is a winding shaped to be traversed by the current flowing through the circuit breaker at the time of its opening. If an electric arc is established between the contacts during the opening, the magnetic field generated by the inductor gives rise to Lorentz forces settling in the arc to rotate it around the axis of the circuit breaker so to promote its extinction.
  • the dimensioning and configuration of the inductor are generally problematic because it is necessary that the inductor generates a field at the same time. intense magnetic, but it does not heat up too much.
  • the inductor is configured to be traversed by current only when opening the contacts, and its winding is sized to enable it to withstand appropriate intensities.
  • the winding is often a so-called Bitter coil, which is a helical coil of sheet metal: it consists of a set of sheet metal parts, for example in the form of half-crowns whose ends are fixed to each other. others to form substantially plane turns superimposed on each other. An insulating band also helical is interposed between the turns so that they are isolated from each other.
  • Bitter coil is a helical coil of sheet metal: it consists of a set of sheet metal parts, for example in the form of half-crowns whose ends are fixed to each other. others to form substantially plane turns superimposed on each other.
  • An insulating band also helical is interposed between the turns so that they are isolated from each other.
  • Such a coil can thus have a high passage section and easily adjustable in terms of dimensioning, by varying the thickness of the sheet used for its manufacture.
  • the invention relates to a rotating arc electric cut-off device such as a circuit breaker or a disconnector, according to claim 1.
  • the device comprises a fixed contact and a movable contact, the movable contact being movable between a closed position in which it is in electrical contact with the fixed contact and an open position in which it is spaced from the fixed contact and at least one inductor including a coil for generating a magnetic field tending to rotate an electric arc appearing between the contacts during the opening of these contacts to promote the extinction of this arc, the inductor comprising a coil formed from a metal strip wound on itself in a spiral.
  • the inductor comprises a coil capable of withstanding currents of high intensity while having a low manufacturing cost.
  • the invention also relates to a device as defined above, wherein the inductor comprises a metal hub around which the coil is wound, and a cylindrical metal ring enclosing the coil.
  • the invention also relates to a device as defined above, wherein the cylindrical ring comprises holes comprising points of soldering or brazing of the metal strip to the ring and / or wherein the hub comprises a slot through which a end of the band.
  • the invention also relates to a device as defined above, in which the hub comprises a cylindrical portion on which the coil strip is wound, this cylindrical portion being extended by a circular plate perpendicular to the cylindrical portion, this plate being spaced apart. of the coil and electrically isolated from this coil.
  • the invention also relates to a device as defined above, in which the The hub's circular plate has an outer diameter corresponding to the outer diameter of the ring and the movable contact while being spaced and electrically isolated from the ring.
  • the invention also relates to a device as defined above, wherein the movable contact and the inductor each comprise a central opening for discharging insulating gas in the event of reheating resulting from an electric arc being established during 'opening.
  • the invention also relates to a device as defined above, wherein the hub comprises a portion of ferromagnetic material in its central region.
  • the idea behind the invention is a rotating arc cutting device architecture, the electromagnet of which is produced by the spiral winding of a copper strip, so as to constitute a coil capable of supporting high intensity currents while having a reasonable manufacturing cost.
  • the invention is described for the case of a circuit breaker, but it can be applied to other types of electrical cut-off devices, such as for example a disconnector.
  • the circuit breaker according to the invention comprises an insulating jacket or insulator 2 having a shape of revolution extending along a longitudinal axis marked by AX.
  • This envelope contains a support of fixed contact 3 and a movable contact support 4 which extend in the extension of one another, being spaced from one another along the longitudinal axis AX in the central part of the circuit-breaker where located the contact organs themselves.
  • These supports 3 and 4 are pieces of aluminum conductive revolution, of generally tubular shapes, and each support has its free end held in position in the insulator 2 by an insulating ring marked by 6 and 7, these rings being spaced apart. one another along the AX axis.
  • Each insulating ring 6, 7 surrounds the contact support that it carries being itself surrounded by the insulator 2 whose inner face is cylindrical.
  • a tubular spacer 8 of smaller thickness than the rings 6 and 7 extends from one ring to the other along the inner face of the insulator.
  • the generally tubular fixed contact support 3 carries a retractable assembly 11 housed in its free end.
  • This crew 11 comprises a slider 12 carrying an inductor 13 so as to constitute an assembly which is movable relative to the support 3 over a short length. Given this mobility in translation along the axis AX, the inductor 13 may protrude more or less from the free end of the support 3.
  • a helical return spring 14 is interposed between the slider 12 and the fixed support 3 to continuously tend to recall the Crew 11 with its inductor 13 to its most output position relative to the end of this fixed support 3.
  • the movable contact which is marked by 16 is carried by the support 4 being able to slide in the end of this support 4 along the longitudinal axis AX over a relatively large stroke. It is guided in longitudinal displacement by the support to be movable in a significantly greater stroke than that of the fixed contact.
  • This movable contact 16 is secured to an operating rod 17 extending along the axis AX being connected to an external actuating member not visible in the figures.
  • the opening and closing of the circuit breaker are provided by the operating member which acts to move the rod 17 along the axis AX so as to move the moving contact 16 away from the fixed contact which extends in the extension of support 3.
  • This movable contact 16 has an outer piston shape, and it is continuously in electrical contact with the support 4 by means of a spring 18 forming a contactor.
  • This spring 18 is a helical spring whose ends are joined, so that it has a global shape of ring crown.
  • This spring 18 is mounted in an internal circular groove of the end of the support 4. This spring 18 is thus continuously in contact with the support 4 which carries it and with the cylindrical outer skirt 19 of the movable contact 16.
  • the movable contact 16 which has a general piston shape having a cylindrical skirt 19 has a contact face corresponding to the cap of this piston which is flat.
  • This cap 21 is supported on the fixed contact when the circuit breaker is closed and when it begins its opening. It has a central opening 22.
  • This central opening 22 makes it possible to put in communication the breaking chamber 9 and the internal space of the support 4 in the opening phase of the circuit-breaker so as to allow the gas heated in the breaking chamber 9 to escape from this chamber cut.
  • the inductor 13 carried by the crew 11 has a general shape of revolution and comprises, as visible more clearly in the figure 3 , a hub 23 surrounded by an inductor 24 and an outer cylindrical ring 26, and an electrical insulator 27.
  • the hub 23 which is conductive has a cylindrical central portion 28, one edge of which is extended radially outwards by a circular plate 29.
  • the cylindrical portion 28 extends along the axis AX, while the circular plate 29 extends perpendicularly to this axis.
  • This plate 29 thus has a central opening 31 opening inside the cylinder 28.
  • This opening 31 also allows, as in the case of the opening central 31 of the inductor, to evacuate out of the breaking chamber 9 of the heated dielectric gas by the formation of an electric arc in this chamber.
  • the inductor coil 24 surrounding the cylinder 28 is made from a strip of conductive material, such as a metal strip, which is wound around this cylinder 28 having for example its first end passed through a longitudinal slot provided for this purpose in the cylinder.
  • the turns of this coil 24 are isolated from each other for example with a strip of insulating material having a width corresponding to that of the conductive strip and coiled together with the latter. It is also possible to directly use a metal strip having one or both of its faces previously covered with an insulating material.
  • Soldering or brazing points may be made at the end of the strip protruding from the inner side of the tube 28 to improve the electrical conduction between the strip and the tube 28.
  • the conductive strip 24 Once the entire length of the conductive strip 24 has been wound, it is kept tight on itself to engage the outer ring 26 around it. Once the ring 26 is in position around the coil 24 held tight on itself, it is then released, so that its last turn, that is to say the most peripheral, then bears against the inner face of the ring 26, which is conductive, to be in contact with it.
  • This ring 26 is advantageously metallic, and it may be provided with several bores to achieve soldering points or brazing of the last peripheral coil to this ring so as to further improve the conductivity.
  • one of the ends of the coil 24 is electrically connected to the hub 23 and the other end of this coil is connected to the ring 26.
  • the coil 24 surrounds the tubular portion 28 at a distance from the plate 29 so as not to have its edge in contact with this plate, and furthermore, the insulator 27 is interposed between the coil and the plate 29.
  • This insulator 27 which has a crown shape, can be put in place for example before winding the coil 24 by being engaged around the tube 28 and against the inner face of the plate 29. It can advantageously be a material of PTFE (polytetrafluoroethylene) type, designed to generate vapors favoring the extinction of a possible arc.
  • PTFE polytetrafluoroethylene
  • thermosetting insulating resin may be provided to cover the edge of the turns of the coil 24 which is opposite the insulator 27 along. AX axis.
  • the assembly can be embedded in a thermosetting resin making it possible to improve the mechanical cohesion thereof, the electrical contact parts then remaining uncovered.
  • the outer diameter of the plate 29 corresponds to the outer diameter of the ring 26, so that the circumferential edges 32 and 33 of these two elements face each other spaced apart from each other along the axis AX of a distance corresponding to the thickness of the insulation 27.
  • the outer diameter of the plate can also be provided to be up to about twenty percent greater than the diameter of the ring.
  • These two edges 32 and 33 are each connected to one end of the coil 24 and the distance between them is chosen to allow the appearance of an electric arc to limit, if necessary, the intensity of the electric current flowing through the coil in the opening phase of the circuit breaker so as to reduce its heating by Joule effect.
  • the distance separating the coil from the plate is chosen to be sufficient to hold the voltage generated by the passage of the current in the electromagnet. This distance can be increased by varying the spacing between the coil and the plate, and also by decreasing the diameter of this plate, which can, by order of magnitude, be reduced to two tenths of the diameter of the plate. the ring 26.
  • slippery contact fingers that are spotted by 34 in the figure 1 constitute the fixed contact of the circuit-breaker. They extend approximately parallel to the axis AX, being regularly distributed around it, so as to surround the inductor 13 and the movable contact 16 whose outer diameters are the same.
  • Each finger 34 has at its end an electrical contact button biased radially towards the axis AX by the elasticity of the finger, so that it bears on the skirt 19 of the movable contact 16 when it is closed, that is to say when it is close to the free end of the support 3 as much as possible.
  • the fingers 34 which form the sliding contact, but it could equally well be constituted by a metal braid or any other device capable of providing a sliding electrical contact function.
  • the plate 29 of the inductor 13 and the cap 21 of the movable contact 16 constitute not contacts for the nominal current but contact areas on which are established the roots of an arc cutoff when opening the circuit breaker .
  • the fingers 34 of the sliding contact leave the cylindrical outer skirt 19 of the movable contact 16 which moves away, before coming into radial abutment on the circular peripheral edge 33 of the plate 29.
  • the current then passes successively through the support 3 , the fingers 34, the plate 29, then the cap 21 still resting on this plate, then the rest of the moving contact 16, then the circumferential spring 18 in order to reach the support 4.
  • the electric current coming from the support 3 passes through the fingers 34 to pass via the ring 26 on which these fingers are resting, in the coil 24 to reach the hub 23 whose plate 29 bears on the cap 21, to reach the movable contact 16 and the support 3.
  • the current can also pass directly from the fingers 34 to the edge 32 so as to join the movable contact 16.
  • the fingers 34 constituting the fixed contact continue to bear on the ring 26 while moving away from the edge of the plate 29 along the axis AX, which corresponds to the situation of the figure 6 .
  • the switching arc C1 then has the possibility of being established between the edges 32 and 33, and no longer between the fingers and the edge 33, to continue to limit the intensity of the current flowing through the coil 24. This arrangement thus allows to limit premature wear of the fingers: they carry an arc root for a period that is small compared to the overall duration of the opening of the circuit breaker.
  • the plate 29 is then no longer supported on the cap 21 of the movable contact 16 and a space now separates these two elements along the axis AX, which corresponds to the situation of the figure 7 .
  • a cut-off arc C2 has formed between the plate 29 and the cap 21. This arc extends approximately parallel to the axis AX while being spaced radially from this axis AX. Moreover, the current flowing through the coil 24 generates a magnetic field.
  • this magnetic field gives rise to Lorentz forces, of orthoradial orientation with respect to the axis AX, which causes the rotation of the arc C2 around the axis AX, to promote its cut, that is to say its disappearance.
  • the arc C2 is forced to rotate about the axis AX so that its roots move on the surface of the plate 29 and the cap 21, and at the same time, these faces move away from one another. another to increase the length to be traversed by this arc. This leads to the cutting of this C2 arc, that is to say to its disappearance when the situation is reached. maximum opening corresponding to that of the figure 8 .
  • the magnetic field generated by the inductor is not channelized, but the system can be equipped with one or more ferromagnetic cores for channeling the field lines to improve the efficiency of the magnetic field on the field. the bow to extinguish.
  • one possibility may be to provide a tubular element of ferromagnetic material mounted to the inner face of the hub 23 by hooping.
  • the inductor and its return means and the sliding contact are carried by the fixed contact support, but it is possible to reverse the mounting.
  • the inductor and its return spring and the contact slip can be carried by the moving contact of the circuit breaker.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)

Claims (5)

  1. Elektrische Drehbogenabschaltvorrichtung (1), wie beispielsweise ein Schutzschalter oder Trennschalter, umfassend einen festen Kontakt (34) und einen beweglichen Kontakt (16), wobei der bewegliche Kontakt (16) zwischen einer geschlossenen Position, in der er in elektrischem Kontakt mit dem festen Kontakt (34) steht, und einer offenen Position, in der er von dem festen Kontakt (34) beabstandet ist, bewegbar ist, sowie mindestens einen Induktor (13) mit einer Spule (24) zum Erzeugen eines Magnetfeldes, das dazu neigt, einen Lichtbogen (C2) zu drehen, der zwischen den Kontakten (11, 16) beim Öffnen dieser Kontakte auftritt, um das Erlöschen dieses Bogens zu fördern, wobei der Induktor (13) eine Nabe (23) aufweist, die einen zylindrischen Abschnitt (28) umfasst, auf den ein Metallband gewickelt ist, um eine Spule (24) zu bilden, einen Metallring (26), der die Spule (24) umschließt, wobei der zylindrische Abschnitt (28) der Nabe (23) durch eine senkrecht zu dem zylindrischen Abschnitt (28) kreisförmige Platte (29) verlängert ist, wobei diese Platte (29) von der Spule (24) beabstandet und von dieser Spule (24) isoliert ist, wobei die Spule (24) ein Ende aufweist, das über den zylindrischen Abschnitt (28) der Nabe (23) elektrisch mit der Platte (29) verbunden ist, und ein Ende, das mit dem die Spule (24) umschließenden Metallring (26) elektrisch verbunden ist,
    dadurch gekennzeichnet, dass
    - die Platte (29) von der Spule (24) durch ein Isoliermaterial (27) beabstandet und isoliert ist;
    - der Induktor (13) am Ende eines festen Kontaktträgers (3) angebracht ist, indem er zwischen einer eingezogenen Position und einer ausgezogenen Position beweglich ist, wobei eine Feder (14) diesen Induktor (13) kontinuierlich in seine ausgezogene Position zurückführt;
    - der bewegliche Kontakt (16) eine Kolbenform aufweist, die ein Schürze (19) mit dem gleichen Durchmesser wie der Ring (26) des Induktors (13) und eine Kappe (21) aufweist, die auf dem Induktor (13) gegen die Feder (14) in Anlage kommt, um ihn eingezogen zu halten, wenn dieser bewegliche Kontakt (16) geschlossen ist, wobei diese Kappe (21) von dem Induktor (13) wegbewegt wird, so dass er seine ausgezogene Position einnimmt, wenn der bewegliche Kontakt (16) geöffnet ist;
    - der feste Kontakt (34) ein Gleitkontakt (34) ist, der sich in der Verlängerung des festen Kontaktträgers (3) erstreckt und ein freies Ende aufweist, das radial auf der Schürze (19) des beweglichen Kontakts (16) anliegt, wenn dieser bewegliche Kontakt (16) geschlossen ist, und in radial auf dem Ring (26) des Induktors anliegt, wenn der bewegliche Kontakt (16) geöffnet ist, um die Einrichtung eines Lichtbogens zwischen der Platte (29) und dem Ring (26) zu ermöglichen, damit der Stromfluss durch die Spule (24) erforderlichenfalls begrenzt ist.
  2. Vorrichtung nach Anspruch 1, wobei der zylindrische Ring (26) Löcher aufweist, die Schweiß- oder Lötstellen vom Metallband (24) zum Ring (26) umfassen und/oder wobei die Nabe (23) einen Schlitz aufweist, durch den ein Ende des Bandes (24) verläuft.
  3. Vorrichtung nach Anspruch 1 oder 2, wobei die kreisförmige Platte (29) der Nabe (23) einen Außendurchmesser aufweist, der dem Außendurchmesser des Rings (26) und des beweglichen Kontakts (16) entspricht, während sie von dem Ring (26) beabstandet und elektrisch isoliert ist.
  4. Vorrichtung nach einem der vorstehenden Ansprüche, wobei der bewegliche Kontakt (16) und der Induktor (13) jeweils eine zentrale Öffnung (22, 32) zum Abführen von Isoliergas bei Erwärmung infolge eines beim Öffnen auftretenden Lichtbogens aufweisen.
  5. Vorrichtung nach einem der vorstehenden Ansprüche, wobei die Nabe (23) in ihrem zentralen Bereich einen Abschnitt aus ferromagnetischem Material aufweist.
EP15716505.1A 2014-04-14 2015-04-13 Drehbogenschutzschalter mit einer feldspule mit hohem widerstand Active EP3132460B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1453326A FR3019934B1 (fr) 2014-04-14 2014-04-14 Disjoncteur a arc tournant comportant une bobine inductrice a tenue elevee
PCT/EP2015/057929 WO2015158643A1 (fr) 2014-04-14 2015-04-13 Disjoncteur a arc tournant comportant une bobine inductrice a tenue elevee

Publications (2)

Publication Number Publication Date
EP3132460A1 EP3132460A1 (de) 2017-02-22
EP3132460B1 true EP3132460B1 (de) 2019-06-12

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ID=50877490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15716505.1A Active EP3132460B1 (de) 2014-04-14 2015-04-13 Drehbogenschutzschalter mit einer feldspule mit hohem widerstand

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EP (1) EP3132460B1 (de)
FR (1) FR3019934B1 (de)
WO (1) WO2015158643A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107895677A (zh) * 2017-10-11 2018-04-10 江苏省如高高压电器有限公司 一种罐式断路器互感器安装系统
CN107680870A (zh) * 2017-10-11 2018-02-09 江苏省如高高压电器有限公司 一种罐式断路器导电机构
CN107731618A (zh) * 2017-10-11 2018-02-23 江苏省如高高压电器有限公司 一种罐式断路器
CN114255977B (zh) * 2021-12-20 2024-04-26 苏州佳成机械制造有限公司 一种应用于电子式互感器的磁缸体组件

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259554A (en) * 1978-01-11 1981-03-31 Electric Power Research Institute Thin arc runner for arc spinner interrupter
US4315121A (en) * 1979-05-11 1982-02-09 Gould Inc. Saturable magnetic steel encased coil for arc spinner interrupter
YU173582A (en) * 1981-09-16 1985-03-20 Bbc Brown Boveri & Cie Electrical switch
FR2620854A1 (fr) * 1987-09-23 1989-03-24 Alsthom Bobine de soufflage magnetique par rotation de l'arc pour element de contact d'un interrupteur electrique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3132460A1 (de) 2017-02-22
WO2015158643A1 (fr) 2015-10-22
FR3019934B1 (fr) 2017-12-08
FR3019934A1 (fr) 2015-10-16

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