EP0378950A1 - Pol für selbstblasenden elektrischen Schalter - Google Patents

Pol für selbstblasenden elektrischen Schalter Download PDF

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Publication number
EP0378950A1
EP0378950A1 EP89420486A EP89420486A EP0378950A1 EP 0378950 A1 EP0378950 A1 EP 0378950A1 EP 89420486 A EP89420486 A EP 89420486A EP 89420486 A EP89420486 A EP 89420486A EP 0378950 A1 EP0378950 A1 EP 0378950A1
Authority
EP
European Patent Office
Prior art keywords
envelope
injected
piston
pole
pole according
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.)
Granted
Application number
EP89420486A
Other languages
English (en)
French (fr)
Other versions
EP0378950B1 (de
Inventor
Denis Raphard
Maurice Perrin
Laurent Besnard
Jean-Yves Blanc
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 EP0378950A1 publication Critical patent/EP0378950A1/de
Application granted granted Critical
Publication of EP0378950B1 publication Critical patent/EP0378950B1/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
    • H01H33/70—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 invention relates to a pole of a medium-voltage circuit breaker with self-blowing by piston of a gas with high dielectric strength, comprising a sealed insulating envelope of generally cylindrical shape filled with said gas, in which a fixed contact are arranged coaxially and a movable contact, the latter being slidably mounted and carrying a piston, confining with a transverse partition of subdivision of said envelope a pistonable compression volume of the arc blowing gas, drawn during the separation of said contacts.
  • a self-blowing electric circuit breaker constituted by the assembly of several poles of the kind mentioned, allows the cutting of medium voltage currents by simple actuation of a control shaft.
  • Each pole has an insulating molded enclosure in the form of a pocket closed on the side of the open bottom with a metallic or insulating cover.
  • the structure and arrangement of these known poles are complicated and require a long assembly and manufacturing time. In particular, guiding the movable contact rod by a series of V-grooved rollers is complicated and expensive.
  • the present invention aims to allow the realization of a simplified structure pole using injected parts, connected by simple snap.
  • the pole according to the invention is characterized in that said transverse partition is constituted by a piece of injected insulating plastic material introduced with low clearance, and kept fixed in said envelope, said piece having a central orifice for passage of said movable contact, which is guided by said part and gas passage orifices fitted with one-way valves, to allow free entry of gas into the pistonable volume through said partition, and to prevent gas from escaping from said volume in the opposite direction to through said passage openings.
  • the injected part constituting the transverse partition which subdivides the envelope into two chambers, has orifices for the passage of gases open during the phase of closing the pole, so as not to slow down the moving assembly in its closing movement. These orifices are closed by a valve in the form of an annular disc during the pole opening phase corresponding to compression of the blowing gas in the pistonable volume.
  • the annular disc forming the valve is interposed with clearance, between the injected part forming the partition and a retaining ring clipped onto this injected part.
  • the seal between the transverse partition and the pole shell is ensured by a seal, in particular an O-ring placed on the circumference of the injected part and maintained by the retaining ring also cooperating with the valve disc.
  • the injected part forming the transverse partition can be introduced into the pole through the open bottom, its immobilization in rotation being ensured by a lug sliding in a longitudinal groove formed in the internal wall of the envelope.
  • the positioning of the injected part in the longitudinal direction is ensured on the one hand by a step formed on the internal wall of the envelope, and on the other hand by a current supply insert embedded transversely in the envelope and carrying a connection screw of a braid, which projects towards the inside of the envelope to serve as a retaining stop for the injected part.
  • the blowing piston integral with the movable contact is also made of injected plastic and it carries a blowing nozzle snapped onto the piston.
  • a scraper ring in the form of a split ring is inserted into a circumferential groove of the piston to ensure sealing between the latter and the envelope of the pole.
  • the rigid part forming the intermediate partition guides the movable contact rod, and the current supply to this contact rod is advantageously produced by a braid.
  • this braid extends in a plane transverse to the pole by being, on the one hand connected to an insert forming a current feedthrough, embedded in the insulating envelope, and on the other hand to the movable contact rod.
  • the connection of the braid to the movable contact rod is made at a point diametrically opposite the point of attachment of the braid to the current feedthrough.
  • the braid preferably constitutes two current supply loops, symmetrically surrounding the movable contact so as to limit the section of the braid.
  • the braid is preferably subdivided into different strands superimposed in the axial direction of the pole, in order to limit its rigidity in this direction.
  • This arrangement of the braid in a transverse plane allows a reduction in height of the pole due to the limitation of the movement of this braid.
  • the fixing screw of the braid to the lateral crossing simultaneously ensures the longitudinal positioning of the injected part forming the transverse partition.
  • the screw for fixing the braid to the movable contact rod can at the same time ensure the articulation of the rod for controlling the movement of the movable contact.
  • an envelope 10 of insulating material in the form of a pocket is closed off with a waterproof material on the side of its open bottom, by a plate 12.
  • the enclosure confined by the envelope 10 is filled with a gas at high dielectric strength, in particular sulfur hexafluoride and two metal inserts are embedded in the wall of the envelope 10 of generally cylindrical shape, one 14 crossing the bottom of the pocket constituting the envelope 10 and extending into the direction axial of the casing 10 by a fixed tubular contact 16.
  • the other insert 18 extends transversely to the casing 10, being offset from the side of the cover 12.
  • the two inserts 14, 18 constitute feedthroughs of current forming the input and the output of the pole housed in the envelope 10.
  • the envelope 10 is crossed by a control shaft 20 on which is cranked a crank 22 controlling a link 24 articulated on a movable contact rod 26.
  • the movable contact rod 26 carries at its end oriented on the side of the fixed contact 16, tulip-shaped main contacts 28, as well as a semifixed arcing contact 30 biased by a spring 32 in the projecting position of the contact fingers of the tulip 28.
  • the movable contact rod 26 crosses a transverse partition 34 with little play, dividing the casing 10 into two chambers, one for cutting the arc drawn during the separation of the contacts 16.30, and the another of cut-off gas expansion.
  • the transverse partition 34 confines with a piston 36 secured to the end of the movable contact rod 26, a pistonable volume ensuring during a movement of opening of the pole a compression of the gas, and a flow of this gas of the volume pistonable through a blowing nozzle 38 fixed to the piston 36.
  • the opening and closing of the pole are controlled by a rotation of the control shaft 20 which generates a sliding of the movable assembly constituted by the movable contact rod 26 and the piston 36.
  • Such a pole is well known to specialists and suffice it to remember that it requires no external source of compressed arc blowing gases, and allows operation for many years without maintenance, in particular without dismantling. of the pole.
  • the blowing piston 36 comprises a piece 40 of injected plastic material of generally circular shape, having on its upper face a cylindrical housing in which the base 42 of the nozzle 38.
  • the nozzle 38 is assembled to the injected part 40 by simple snap-fastening and it is held by retaining hooks 44 coming from injection with the part 40.
  • the part 40 has orifices 46 putting in communication the interior of the nozzle 38 and the opposite side of the piston 36.
  • the seal between the piston 36 and the casing 10 is ensured by a scraper ring 48 in the form of a split ring coming to be housed in a circumferential groove 50 of the part injected 40.
  • the mounting of the piston 36 is particularly simple, since it suffices to set up the scraper seal 48 and to snap on the nozzle 38. This ease of assembly is due to the possibility of producing by injection pieces of suitable shapes .
  • the transverse partition 34 ensuring the subdivision of the casing 10 into two chambers.
  • the transverse partition 34 is also constituted by a piece of injected plastic material 52 of generally cylindrical shape.
  • the injected part 52 has a central part 54 forming a passage and guide orifice for the movable contact rod 26 which passes through it.
  • the orifice 54 extends over a certain axial height to ensure correct guiding of the contact rod 26.
  • the injected part 52 is extended by a cylindrical skirt 56 closely fitting the envelope 10 to ensure perfect positioning of the transverse partition 34 in the casing 10.
  • the rotational positioning of this injected part 52 is obtained by the penetration of a lug 58 projecting from the side, in a conjugate longitudinal groove (not shown) formed in the wall internal of the envelope 10.
  • the upper part of the injected part 52 offers an internal circular housing 60 in which a disc-shaped valve 62 is fitted, capable of covering orifices 64 through which the transverse partition 34 passes.
  • a ring retaining 66 can be fitted or optionally clipped into the housing 60 to hold the valve disc 62.
  • the retaining ring 66 has an external flange 68 which cooperates with a conjugate rim 70 of the injected part 52 to delimit a circumferential groove for housing an O-ring seal 72.
  • the orifices 64 extend in arcs of a circle to provide a significant section for passage of gas while being susceptible to '' be closed by the valve disc 62 of annular shape during the gas compression phase in the pistonable volume.
  • the assembly and installation of the transverse partition 34 are particularly simple, since it suffices to have the gasket 72 and the valve disc 62 before fitting the retaining ring 66. This assembly is then threaded into the 'envelope 10 taking care to introduce the lug 58 in the conjugate groove.
  • the upper edge of the retaining ring 66 comes into abutment with a step 74 formed in the internal wall of the envelope 10. This step 74 limits the axial movement of the transverse partition 34 in the direction of the fixed contact 16. The movement in the opposite direction is limited by a plate 79 itself secured to the braid 78 and held in place by a screw 76 screwed into the transverse insert 18.
  • step 74 and the plate 79 immobilize the transverse partition 34 in the axial direction, keeping the retaining ring 66 engaged in its housing 60.
  • the immobilization in rotation of this transverse partition 34 is ensured by the lug 58, and the height axial of the assembly ensures perfect positioning of the injected part 52 which guides the sliding contact movable rod 26.
  • the electrical connection between the movable contact rod 26 and the transverse insert 18 is made by a flexible braid 78 extending in the form of two half-loops in a plane transverse to the envelope 10 (FIG. 7).
  • the two half-loops of the braid 78 surround on either side, the movable contact rod 26 while being by one of their ends secured to the metal insert 18 by a screw which is advantageously the positioning screw 76 axial of the transverse partition 34.
  • the opposite end of the half-loops of the braid 78 is connected to the movable contact rod 26 by a screw diametrically opposite the screw 76.
  • the length of the braid 78 is sufficient to extend near the casing 10 over a length sufficient for an axial clearance of the contact rod 26.
  • the braid 78 is made up of several strands superimposed in the axial direction of the pole to ensure a certain flexibility in this axial direction.
  • the braid 78 In the intermediate position of the movable contact rod 26, the braid 78 extends substantially in a diametrical plane containing the insert 18, the upward and downward movement being effected during a sliding of the rod. movable contact 26 on either side of this diametrical plane.
  • the braid 78 In the extreme position, the braid 78 extends in a slightly inclined plane, the length of this braid being sufficient to compensate for the increase in the distance between the fixing screws 76 and 80.
  • This transverse arrangement of the braid 78 limits its height the space required to accommodate the braid 78, and allows a shortening of the circuit breaker pole.
  • the connection screw 80 of the braid 78 to the contact rod 26 advantageously constitutes the axis of attachment and articulation of the rod 24. A second screw can be superimposed when using a braid of relatively large height .
  • the attachment of the piston 36 to the movable contact rod 26 can be carried out in different ways, a particularly simple manner consisting in providing on the end of the rod 26 a flange on which the injected part 40 fits.
  • the holding in position nested can be easily achieved by the establishment of the main tulip contact fingers 28 which extend laterally from the movable contact rod 26 to overlap on the injected part 40. Any other method of attachment is of course usable.
  • the envelope 10 is preferably of a well known per se in an epoxy resin.
  • Figures 8 and 9 illustrate an alternative embodiment of the snap fastening of the nozzle 38 on the injected part 40.
  • the nozzle 38 carries teeth 82 which snap on legs 84 in the form of a stirrup carried by the part injected 40.
  • FIGS. 10 to 12 show an attachment by means of a ring 88.
  • the nozzle 38 carries a circumferential collar 94 in the vicinity of its base 42 and the injected part 40 has nozzles 90 fixing on which comes to fit and fix the ring 88, which is supported on the collar 94.
  • the ring 88 comprises opposite each spout 90 an orifice 98 in bayonet whose enlarged part 96 allows the fitting of the ring on the spout 90 and whose narrow part 98 allows pivoting the passage over the spout 90 and the fixing of the ring 88 and of the nozzle 38 on the injected part 40.

Landscapes

  • Circuit Breakers (AREA)
  • Breakers (AREA)
EP89420486A 1989-01-17 1989-12-12 Pol für selbstblasenden elektrischen Schalter Expired - Lifetime EP0378950B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8900581 1989-01-17
FR8900581A FR2641898B1 (fr) 1989-01-17 1989-01-17 Disjoncteur electrique a autosoufflage

Publications (2)

Publication Number Publication Date
EP0378950A1 true EP0378950A1 (de) 1990-07-25
EP0378950B1 EP0378950B1 (de) 1994-04-20

Family

ID=9377849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420486A Expired - Lifetime EP0378950B1 (de) 1989-01-17 1989-12-12 Pol für selbstblasenden elektrischen Schalter

Country Status (11)

Country Link
US (1) US5095183A (de)
EP (1) EP0378950B1 (de)
JP (1) JP3133044B2 (de)
CN (1) CN1024970C (de)
AU (1) AU626380B2 (de)
BR (1) BR9000156A (de)
CA (1) CA2006033C (de)
DE (1) DE68914819T2 (de)
ES (1) ES2055143T3 (de)
FR (1) FR2641898B1 (de)
ZA (1) ZA9028B (de)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
FR2438906A2 (fr) * 1978-10-09 1980-05-09 Merlin Gerin Interrupteur a autosoufflage module equipe d'un ecran a fentes de passage du gaz
EP0011542A1 (de) * 1978-11-14 1980-05-28 Merlin Gerin Leistungsschalter mit getrennten Leistungs- und Parallelstrombahnen

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CH568649A5 (de) * 1974-07-29 1975-10-31 Sprecher & Schuh Ag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438906A2 (fr) * 1978-10-09 1980-05-09 Merlin Gerin Interrupteur a autosoufflage module equipe d'un ecran a fentes de passage du gaz
EP0011542A1 (de) * 1978-11-14 1980-05-28 Merlin Gerin Leistungsschalter mit getrennten Leistungs- und Parallelstrombahnen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2325858A1 (de) * 2009-11-20 2011-05-25 ABB Technology AG Mittelspannungsschutzschalteranordnung
WO2011060921A1 (en) * 2009-11-20 2011-05-26 Abb Technology Ag Medium voltage circuit breaker arrangement
US8629366B2 (en) 2009-11-20 2014-01-14 Abb Technology Ag Medium voltage circuit breaker arrangement

Also Published As

Publication number Publication date
JP3133044B2 (ja) 2001-02-05
CA2006033C (en) 1999-11-02
ES2055143T3 (es) 1994-08-16
ZA9028B (en) 1990-09-26
FR2641898B1 (fr) 1991-03-15
US5095183A (en) 1992-03-10
EP0378950B1 (de) 1994-04-20
DE68914819D1 (de) 1994-05-26
DE68914819T2 (de) 1994-10-27
BR9000156A (pt) 1990-10-23
AU4934290A (en) 1991-08-29
CN1044361A (zh) 1990-08-01
CA2006033A1 (en) 1990-07-17
JPH02227924A (ja) 1990-09-11
AU626380B2 (en) 1992-07-30
FR2641898A1 (fr) 1990-07-20
CN1024970C (zh) 1994-06-08

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