EP0401131A1 - Elektrischer Schalter mit rotierendem Lichtbogen - Google Patents

Elektrischer Schalter mit rotierendem Lichtbogen Download PDF

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Publication number
EP0401131A1
EP0401131A1 EP90420243A EP90420243A EP0401131A1 EP 0401131 A1 EP0401131 A1 EP 0401131A1 EP 90420243 A EP90420243 A EP 90420243A EP 90420243 A EP90420243 A EP 90420243A EP 0401131 A1 EP0401131 A1 EP 0401131A1
Authority
EP
European Patent Office
Prior art keywords
contact
movable
crank
contacts
main
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Withdrawn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
EP90420243A
Other languages
English (en)
French (fr)
Inventor
Roger Bolongeat-Mobleu
Denis Raphard
Jean-Pierre Boyer
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 EP0401131A1 publication Critical patent/EP0401131A1/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Withdrawn legal-status Critical Current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
    • H01H33/187—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet comprising a hollow annular arc runner and a central contact between which a radially drawn arc rotates

Definitions

  • the invention relates to an electric switch with self-blowing by rotation of the arc under the action of a magnetic field, having a sealed enclosure filled with a gas with high dielectric strength, in particular sulfur hexafluoride, in which are arranged a movable main contact pivotally mounted on a first fixed axis and cooperating with a fixed main contact and a movable arcing contact pivotally mounted on a second fixed axis parallel to said first fixed axis and cooperating with an electrode of revolution, disposed coaxially inside a coil, electrically connected in series with the arcing contacts in an arcing circuit connected in parallel with the main circuit which comprises said main contacts.
  • a gas with high dielectric strength in particular sulfur hexafluoride
  • An electric switch of the kind mentioned uses the energy of the arc to blow it and therefore requires relatively low control energy, limited to the mechanical force of displacement of the contacts.
  • the main contacts are protected by switching on the arcing circuit, this switching can be obtained either by arc migration, or by arcing contacts connected in parallel with the main contacts and opening after contact separation main.
  • the use of arcing contacts connected in parallel with the main contacts avoids any arcing or sparking on the latter during their separation, but requires perfect synchronization of the movements in order to avoid any premature opening of the arc or vice versa when closing the main contacts are closed beforehand.
  • To the problem of synchronization of movements is added that of the electro-dynamic repulsion forces exerted on the movable contacts through which the short-circuit currents require robust control mechanisms.
  • the present invention aims to allow the production of a switch with a simplified control mechanism capable of positioning and controlling the main contacts and the arcing contacts.
  • the switch according to the invention is characterized in that said electrode is in the form of a hollow cylinder inside which struggles said movable arcing contact between two extreme closing and opening positions, in which positions the contact d the movable arc is respectively in contact with the internal periphery of the electrode and substantially in the center of said electrode and that a mechanical connection connects the movable main contact and the movable arcing contact to cause the opening of the arcing contacts after that of the main contacts and the closing of the arcing contacts before that of the main contacts, said mechanical connection comprising an elastic element for supplying the contact pressure for closing the arcing contacts and a means for neutralizing the elastic element in position central opening of the movable arcing contact to create a rigid connection between the two movable contacts, said elastic element allowing movement for followed by closing the movable main contact after the movable arcing contact has come into the closed position, and vice versa, a prior movement for opening the movable main contact before the movable arcing contact has opened.
  • the main contacts and the arcing contacts are both closed, only a fraction of the current passing through the arcing circuit having a high impedance due inter alia to the blow coil inserted in this circuit. .
  • the movable arcing contact is maintained in contact with the cylindrical electrode constituting the fixed arcing contact with a sufficient contact pressure generated by the elastic element of the mechanical connection.
  • This elastic force of contacts prevents any untimely opening of the arcing contacts.
  • This elastic connection associated with a dead travel also allows the delayed opening of the arcing contacts during an opening movement of the main contacts and conversely a prior closing of the arcing contacts.
  • the elastic element In the open position the elastic element is neutralized and the movable arcing contact is rigidly coupled to the fixed contact. The movable arcing contact is thus positively maintained in the open position in the axis of the cylindrical electrode and it is capable of withstanding the electro-dynamic forces exerted on it.
  • the neutralization of the elastic element in the open position of the switch is carried out by a crank connecting rod system having a hinge mounted to slide in a light secured to the crank.
  • the fixed main contact carries the crank while the connecting rod is hinged to the movable arcing contact.
  • the elastic element is constituted by a spring urging the trunnion carried by the connecting rod and constituting the articulation of the crank connecting rod system at the bottom of the crank opening.
  • the crank and the connecting rod In the open position, the crank and the connecting rod extend perpendicularly and the forces exerted on the connecting rod are transmitted directly to the crank while remaining without effect on the elastic element.
  • the crank travel is close to 90 ° and the crank connecting rod system is substantially aligned in the open position of the switch.
  • the movable main contact is a knife pivotally mounted on a fixed axis carried by the end of a bushing and this knife cooperates with a pad or a fixed contact clamp secured to another bushing.
  • the movable arcing contact is a contact pad coming to bear on the internal surface of the cylindrical electrode.
  • the assembly is housed in a sealed envelope filled with sulfur hexafluoride, the arc circuit being offset with respect to the main circuit, the length of which is shorter.
  • the control mechanism disposed outside the envelope drives a control shaft sealingly passing through the wall of the envelope.
  • This control shaft carries a crank connected by a connecting rod to the movable main contact.
  • the movable main contact pivots in the opening direction by rotating the crank which, by the elongated light, introduces a dead travel to maintain the movable contact. arc in closed position.
  • the main contacts separate before the complete travel of the dead travel, causing a switching of the current on the arcing circuit.
  • This current flowing through the blowing coil generates a magnetic field, in particular an axial field inside the cylindrical electrode.
  • the movable arcing contact is positioned perfectly in the center of the cylindrical electrode whatever the electro-dynamic forces exerted on it.
  • a pole of an electrical circuit breaker in particular of medium voltage comprises a sealed envelope 10 made of an insulating material, filled with a gas with high dielectric strength, in particular sulfur hexafluoride under an appropriate pressure.
  • Bushings 12, 14 shaped as a current supply terminal pass through the wall of the casing 10, one of the bushings carrying a main fixed contact pad 16.
  • the other bushing 12 extends inside the envelope 10 by a support 18 of a fixed axis 20 of articulation of a movable main contact in the form of a knife 22, cooperating in the closed position with the fixed contact pad 16.
  • the knife 22 can be constituted by two blades contact subjected to the action of a spring and coming to grip a contact pad 16 or conversely the knife 22 can be a single blade coming to be inserted between contact clamps constituting the fixed contact pad 16.
  • the assembly of fixed contact pad 16, knife 22 and support 18 are substantially aligned and constitute a main circuit for the passage of current from one of the bushings to the other.
  • Parallel and laterally offset inside the casing 10 is arranged an arc circuit constituted by a coil 24, a cylindrical electrode 26, a movable arcing contact 28 and a support arm 30.
  • the support arm 30 integral with the bushing 12 carries a hinge pin 32 of the movable arcing contact 28 and the coil 24 is electrically connected to the opposite bushing 14.
  • the movable arcing contact 28 comprises a contact pad 34 in the form of a cylindrical wafer coming into the closed position in contact with the internal surface 36 of the cylindrical electrode 26.
  • the articulation axis 32 of the arcing contact is disposed on the axis 38 of the cylindrical electrode 26. and this axis 32 s 'extends parallel to the axis 20 of articulation of the knife 22.
  • the movable arcing contact 28 is extended beyond the axis 32 by an arm 40 to which a connecting rod 42 is articulated, the opposite end of which carries a pin 44 slidably mounted in a slot 46 formed at the end d 'a crank 48 integral with the knife 22.
  • the pin 44 In the position closure shown in Figure 1 the pin 44 is in an intermediate compression position of the spring 50 the latter exerting via the connecting rod 42 and the arm 40 a bearing force of the contact pad 34 against the cylindrical surface 36 .
  • a rotary control shaft 52 sealingly traverses the wall of the casing 10 and its outer end is connected to a control mechanism, not shown.
  • the inner end of the control shaft 52 carries a crank 54 connected by a hinge 56 to a control rod 58, articulated at its opposite end 60 to the knife 22.
  • the toggle joint constituted by the crank 54 and the connecting rod 58 is in an extension position for holding the knife 22 in the closed position and that a rotation of the shaft 52 in the counterclockwise direction a watch causes a displacement towards the open position of the knife 22 which pivots clockwise on the axis 20.
  • the closing of the switch is controlled by a reverse rotation of the control shaft 52 in a manner well known to specialists.
  • the switch according to the invention operates as follows:
  • the closing of the switch is generated by a reverse rotation of the control shaft 52, which causes the pivoting in the clockwise direction of the crank 54 and through the control rod 58 a pivoting anti-clockwise of the knife 22.
  • the crank 48 pivots with the knife 22 around the fixed axis 20 and this movement is transmitted by the connecting rod 42 to the movable arc contact 28 which pivots in the direction counterclockwise around fixed axis 32.
  • the contact pad 34 bears against the internal surface 36 of the annular electrode 26 which prevents further movement of this contact 34.
  • this intermediate position which corresponds to that illustrated in FIG. 3, the main contacts 22 16 are still separated and closing is effected by the arc circuit.
  • the elastic connection due to the lumen 46 and to the spring 50 allows continued pivoting of the knife 22, the pin 44 sliding in the lumen 46 until the knife 22 comes into the closed position shown in FIG. 1.
  • the spring 50 provides the contact pressure of the arcing contacts 26 34.
  • the mechanism is particularly simple and it ensures synchronism and the succession of opening and closing of the contacts, necessary for the protection of the main contacts 16, 22. This mechanism similarly ensures the closing contact pressure as well as the maintenance or locking of the movable arcing contact 28 in the open position at the center of the cylindrical electrode. In this open position, the arc drawn during the separation of the arcing contacts 26, 34 extends radially inside the cylindrical electrode 26 and it is subjected to the axial magnetic field generated by the current flowing through the coil 24.
  • the arrangement according to the invention of the arcing contacts in parallel and with a lateral offset inside the casing 10, with respect to the main contacts 16, 22, allows a clear separation of the functions and avoids any interference liable to cause re-strikes or strikes on the main contacts 16, 22.
  • the radial arrangement of the arc inside the cylindrical electrode 26 limits the risks of migration and the length of the arc can correspond to the optimal extinction length .
  • the use of an arc contact 34 in the form of a wafer allows symmetry and a conformation favorable to the blowing and the interruption of the arc.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
EP90420243A 1989-05-31 1990-05-18 Elektrischer Schalter mit rotierendem Lichtbogen Withdrawn EP0401131A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907290 1989-05-31
FR898907290A FR2647948B1 (fr) 1989-05-31 1989-05-31 Interrupteur electrique a arc tournant

Publications (1)

Publication Number Publication Date
EP0401131A1 true EP0401131A1 (de) 1990-12-05

Family

ID=9382295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420243A Withdrawn EP0401131A1 (de) 1989-05-31 1990-05-18 Elektrischer Schalter mit rotierendem Lichtbogen

Country Status (9)

Country Link
US (1) US5003138A (de)
EP (1) EP0401131A1 (de)
JP (1) JPH0329227A (de)
CN (1) CN1022271C (de)
AU (1) AU619159B2 (de)
BR (1) BR9002557A (de)
CA (1) CA2016980A1 (de)
FR (1) FR2647948B1 (de)
ZA (1) ZA903982B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676782A3 (de) * 1994-04-08 1997-10-22 S & C Electric Co Schalter mit rotierendem Lichtbogen für Lasttrenner.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2677168B1 (fr) * 1991-06-03 1994-06-17 Merlin Gerin Disjoncteur moyenne tension a energie de commande reduite.
JP2931862B2 (ja) * 1995-04-28 1999-08-09 株式会社戸上電機製作所 遮断器の消弧装置
US6943313B2 (en) * 2001-10-22 2005-09-13 S & C Electric Co. Rotating arc fault-current interrupter
US7075027B1 (en) * 2005-05-19 2006-07-11 Eaton Corporation Spring-charged mechanism assembly employing two trunnion members moveable in different planes and circuit interrupter employing the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763340A (en) * 1971-02-12 1973-10-02 Siemens Ag High-voltage circuit breaker equipped with means for placing a resistor in parallel with the breaker contact during breaker closing operations
FR2493034A1 (fr) * 1980-10-27 1982-04-30 Merlin Gerin Disjoncteur haute tension a autosoufflage a chambres auxiliaires d'insertion de resistances a la fermeture
EP0053524A1 (de) * 1980-11-17 1982-06-09 Merlin Gerin Elektrischer Schalter mit Selbstblasung durch Lichtbogenrotation
GB2103018A (en) * 1981-07-02 1983-02-09 Int Standard Electric Corp Electrical switchgear
EP0092205A2 (de) * 1982-04-19 1983-10-26 Hitachi, Ltd. Zusammengestellter Schutzschalter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58117621A (ja) * 1981-12-30 1983-07-13 株式会社安川電機 回転ア−ク形ガス遮断器
GB8607398D0 (en) * 1986-03-25 1986-04-30 Northern Eng Ind Arc interrupter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763340A (en) * 1971-02-12 1973-10-02 Siemens Ag High-voltage circuit breaker equipped with means for placing a resistor in parallel with the breaker contact during breaker closing operations
FR2493034A1 (fr) * 1980-10-27 1982-04-30 Merlin Gerin Disjoncteur haute tension a autosoufflage a chambres auxiliaires d'insertion de resistances a la fermeture
EP0053524A1 (de) * 1980-11-17 1982-06-09 Merlin Gerin Elektrischer Schalter mit Selbstblasung durch Lichtbogenrotation
GB2103018A (en) * 1981-07-02 1983-02-09 Int Standard Electric Corp Electrical switchgear
EP0092205A2 (de) * 1982-04-19 1983-10-26 Hitachi, Ltd. Zusammengestellter Schutzschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0676782A3 (de) * 1994-04-08 1997-10-22 S & C Electric Co Schalter mit rotierendem Lichtbogen für Lasttrenner.

Also Published As

Publication number Publication date
FR2647948B1 (fr) 1994-03-04
AU619159B2 (en) 1992-01-16
BR9002557A (pt) 1991-08-13
CN1047756A (zh) 1990-12-12
CN1022271C (zh) 1993-09-29
US5003138A (en) 1991-03-26
CA2016980A1 (en) 1990-11-30
JPH0329227A (ja) 1991-02-07
ZA903982B (en) 1991-03-27
FR2647948A1 (fr) 1990-12-07
AU5608990A (en) 1990-12-06

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