Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
  • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
  • H01H71/0271—Mounting several complete assembled circuit breakers together
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H1/00—Contacts
  • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
  • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
  • H01H1/20—Bridging contacts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H1/00—Contacts
  • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
  • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
  • H01H1/20—Bridging contacts
  • H01H1/2041—Rotating bridge
  • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/1009—Interconnected mechanisms
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/02—Housings; Casings; Bases; Mountings
  • H01H71/0264—Mountings or coverplates for complete assembled circuit breakers, e.g. snap mounting in panel
  • H01H71/0271—Mounting several complete assembled circuit breakers together
  • H01H2071/0285—Provisions for an intermediate device between two adjacent circuit breakers having the same general contour but an auxiliary function, e.g. cooling, isolation, wire guiding, magnetic isolation or screening
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
  • H01H71/10—Operating or release mechanisms
  • H01H71/1009—Interconnected mechanisms
  • H01H2071/1036—Interconnected mechanisms having provisions for four or more poles
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
  • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
  • H01H2077/025—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with pneumatic means, e.g. by arc pressure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
  • H01H73/02—Details
  • H01H73/04—Contacts
  • H01H73/045—Bridging contacts

Definitions

• the invention relates to a unipolar breaking block comprising a rotary contact bridge, at least one fixed contact cooperating with said contact bridge and connected to a current supply conductor, a rotary bar having a transverse housing orifice with play of said contact bridge, which protrudes from the bar, said rotary bar being interposed between two side faces of the cutoff block, said side faces being substantially parallel.
• Said rotary contact bridge also comprises two sealing flanges placed respectively between the radial faces of the rotary bar and the side faces to ensure a seal between the inside and outside of the cutoff block.
• At least one arc extinction chamber opens on an opening volume of the contact bridge.
• the invention also relates to a cut-off device comprising such a cutoff device breaking device.
• the invention also relates to a circuit breaker comprising a cut-off device.
• the molded-case cut-off device comprises a box 12 made of insulating plastic material containing cut-off elements of a pole, in this case a pair of fixed contacts. 41, 51 and a movable contact bridge 22, as well as two cutoff chambers 24.
• the box 12 of parallelepipedal general shape consists of two large side faces.
• the movable contact bridge 22 is carried by a rotating bar 26, interposed between the two large lateral faces.
• the rotating bar 26 has a transverse housing orifice 21 which extends along a diameter in a direction parallel to the large lateral faces.
• the movable contact bridge 22 passes through this hole with clearance projecting from both sides of the bar 26.
• the contact bridge 22 is mounted floating on the bar 26.
• Two current leads 4, 5 are connected to the fixed contacts 41, 51.
• a seal between the rotating bar and the molded housing is therefore necessary.
• This sealing can be achieved using two flanges placed respectively on the faces of the bar between said bar and the inner wall of the two large side faces.
• the effectiveness of these solutions remains however perfectible.
• the flanges are mounted around the drive shaft with an axial operating clearance that can be responsible for the passage of gas related to the cut.
• the invention therefore aims to overcome the drawbacks of the state of the art, so as to provide a rotary bar cut block having effective sealing means.
• the rotary bar of the breaking block comprises at least one channel in direct connection between the transverse housing orifice and a radial face so that the cutoff gases can flow directly via said channel to at least one flange in order to push it against one of the lateral faces to ensure a seal.
• the rotary bar comprises two channels respectively connected between the transverse housing orifice and a radial face so that the cutoff gases can flow directly via said channels to the puddles. sealing in order to push against the side faces to ensure a seal.
• the rotary bar comprises a channel opening and running on either side of the rotary bar from a first to a second radial face.
• the opening channel has a longitudinal axis parallel to a longitudinal axis of the rotary bar.
• the opening channel comprises a longitudinal axis aligned with a longitudinal axis of the rotary bar so that the cutting gases can exert a thrust force substantially aligned with the longitudinal axis of said bar and evenly distributed on the sealing flanges.
• the sealing flanges comprise lateral cheeks covering at least partially the longitudinal surface of the rotary bar.
• the lateral cheeks partially close the transverse housing housing of the bar.
• the lateral cheeks are positioned on the entire cylindrical periphery of the sealing flange.
• the sealing flanges comprise at least one eccentric through hole for the passage of a connecting bar for mechanically securing a plurality of bars, the connecting bar being controlled by a mechanism common to the set of several unipolar blocks.
• the breaking block comprises a pair of fixed contacts, each fixed contact cooperating with the rotating contact bridge and a current supply conductor.
• the block comprises two arc extinguishing chambers respectively opening on an opening volume of the contact bridge.
• Each interrupting chamber is connected to at least one exhaust channel of the cutoff gases, said exhaust channels being opening on an upstream face of the casing of the cutoff block, said upstream face being positioned opposite to another downstream face intended to be placed in contact with means of trigger.
• said exhaust channels of the cutoff gases meet in a common duct leading to the upstream face of the casing of the cutoff block.
• the exhaust channels of the cutoff gases, respectively of a first and second breaking chambers are of different length, the cutoff gases flowing in a first exhaust channel being intended to suck by Venturi effect the gases flowing in a second exhaust channel.
• said at least one gas escape channel of an arc cutting chamber passes through at least one decompression chamber comprising at least one wall covered with at least one metal sheet.
• the breaking device comprises at least one breaking block as defined above.
• Said device comprises a mechanism for actuating the contacts, said at least one breaking block being intended to be connected on the one hand to the trigger 7 at the downstream range 5 and on the other hand to a current line to be protected at level of an upstream range 4.
• the circuit breaker according to the invention comprises a cut-off device as defined above.
• Said circuit breaker comprises a trigger connected to the downstream ranges of the breaking device.
• FIG. 1A shows a view sectional side of a known unipolar break block
• FIG. 1B shows a detail view in perspective of a rotary bar of a cutoff block in Figure 1A;
• FIG. 2 represents an overall perspective view of a circuit breaker comprising a cut-off device according to one embodiment of the invention;
• FIG. 3A represents an exploded perspective view of a circuit breaker comprising a cut-off device according to one embodiment of the invention
• FIG. 3B represents a perspective view of a cut-off device during assembly according to one embodiment of the invention
• Figures 4 to 8 show perspective views of a unipolar cutoff block and a portion of its housing according to a preferred embodiment of the invention
• Figures 9A and 9B show detailed sectional views of a gas exhaust channel of a cutoff unit according to the invention.
• the circuit breaker 100 comprises a trigger 7 associated with a cut-off device 600.
• the cut-off device 600 according to the invention comprises at least one unipolar cutoff block 10.
• the unipolar cutoff block according to the invention is intended to be connected on the one hand to the trigger 7 at the downstream range 5 and on the other hand to a current line to be protected at an upstream range 4.
• the unipolar cutoff block 10 is also called bulb.
• the cut-off device 600 comprises three unipolar breaking blocks.
• the switching device 100 is then a three-pole circuit breaker.
• the switchgear could be a uni circuit breaker, bi or four-pole.
• the elements making up the switching apparatus 100 will be described in relation to the use position in which the circuit breaker 100 is set up in a table, with the nose 9 comprising a vertical handle and parallel to the mounting wall, the upstream connection pads 4 on the electrical line located at the top and forming the upper face 74 of the cut-off device 100 and the trigger 7 at the bottom.
• the use of relative positional terms, such as “lateral”, “superior”, “background”, etc., should not be construed as a limiting factor.
• the handle is intended to control an actuating mechanism 8 of the electrical contacts.
• Each unipolar break block 10 allows the breaking of a single pole.
• Said block is advantageously in the form of a flat housing 12 of molded plastic, with two large parallel faces 14 distant of a thickness e.
• the thickness e is of the order of 23 mm for a 60 A caliber.
• the housing 12 is formed of two parts, preferably mirror symmetrical, secured to one another on their large surface 14 by any suitable means. As illustrated in an embodiment in FIG. 4, a complementary tenon / mortise type system allows the fitting of the housing portions 12 to one another, one of the two parts (not shown) comprising adapted lugs to penetrate recesses of the other. Arrangements 18 are also made to allow the juxtaposition of the housings 12 of unipolar block 10 and their connection to a multipole circuit breaker 100.
• the unipolar breaking block comprises a cutoff mechanism 20 housed in the housing 12.
• the cutoff mechanism 20 comprises a movable contact bridge 22 rotatable about one of the axis of rotation Y.
• the movable contact bridge 22 comprises at least an end having a contact pad. Said contact pad of the movable contact bridge 22 is intended to cooperate with a fixed contact. Said bridge is pivotally mounted between an open position in which the contact area is spaced from a fixed contact 41 and a current flow position in which it is in contact with the fixed contact 41.
• the movable contact bridge 22 is mounted floating in a rotary bar 26 having a transverse housing orifice 21 of said contact bridge.
• the movable contact bridge 22 passing through the transverse housing orifice 21 projects from the bar 26.
• Said rotary bar 26 is interposed between two lateral faces 14 of the housing 12 cutoff block 10.
• two sealing flanges 27 are preferably placed respectively between the radial faces of the rotary bar 26 and the lateral faces 14 in order to ensure a seal between the inside and the outside of the cutoff block 10.
• the sealing flanges 27 are of cylindrical shape and may take the form of a washer.
• the rotary bar 26 comprises at least one channel 29 connected directly between the transverse housing orifice 21 and a lateral face 14 so that the cutoff gases can flow directly via said channel to at least one sealing flange 27 to push against one of the side faces 14 to ensure a seal.
• the rotary bar 26 preferably comprises two channels 29 respectively connected between the transverse housing orifice 21 and a radial face so that the cutoff gases can flow directly via said channels to the flanges seal 27 to push against the side faces 14 to ensure a seal.
• the channel 29 of the rotary bar 26 is preferably opening and passes on either side of the rotary bar 26 from a first to a second radial face. Said opening channel 29 preferably comprises a longitudinal axis parallel to a longitudinal axis of the rotary bar 26.
• the opening channel 29 preferably comprises a longitudinal axis aligned with a longitudinal axis of the rotary bar 26 so that cut can exert a force to push substantially aligned with the longitudinal axis of the bar and evenly distributed on the sealing flanges.
• said flanges comprise lateral cheeks at least partially covering the longitudinal surface of the rotary bar 26 to partially close the orifice transverse housing 21.
• the lateral cheeks are preferably positioned over the entire cylindrical periphery of the sealing flange 27.
• the cutoff mechanism 20 is double rotary cut.
• the switching device 100 according to the invention is particularly intended for applications up to 630 A and in some applications up to 800 A, for which the simple cut may not be sufficient.
• the movable contact bridge 22 then comprises at each end a contact pad.
• the contact pads of the contact bridge 22 are preferably placed symmetrically with respect to the axis of rotation Y.
• the rotating movable contact bridge 22 passing through the transverse housing orifice 21 protrudes on either side of the
• the cutoff block comprises a pair of fixed contacts 41, 51 for cooperating with a contact pad of the movable contact bridge 22. Said bridge is pivotally mounted between an open position in which the contact pads are spaced apart.
• the unipolar breaking block 0 comprises two arc breaking chambers 24 for extinguishing the electric arcs.
• Each interrupting chamber 24 opens on an opening volume between a contact pad of the contact bridge 22 and a fixed contact 41, 51.
• Each breaking chamber 24 is delimited by two side walls 24A, a rear wall 24B remote. the opening volume, a bottom wall 24C close to the fixed contact and a top wall 24D.
• each breaking chamber 24 comprises a stack of at least two deionization vanes 25 separated from one another by a gap of exchange of the cutoff gases.
• the housing 12 of the breaking block 10 furthermore comprises arrangements for optimizing the flow of gases.
• Each interrupting chamber 24 comprises at least one output connected to at least one exhaust channel 38, 42 of the cutoff gases.
• Said exhaust channels 38, 42 are intended to evacuate the gases through at least one opening orifice 40 positioned on an upstream face of the housing 12 positioned opposite another downstream face. The downstream face of the housing 12 is intended to be placed in contact with the trigger 7.
• Each arc-cutting chamber 24 has less than an exchange space between two fins 25 connected to a gas exhaust channel 38, 42.
• all the exchange spaces are connected to the exhaust gas channels. 38, 42 at a zone remote from the opening volume towards the rear wall and at the side walls of the arc cutting chamber 24.
• the mounting of the contact bridge 22 and the rotary bar 26 in a unipolar breaking block 10 is "inverted": it is desired that the lever 9 of the mechanism 8 for actuating the contacts (see FIGS. 3A) is centered on the cut-off device 600 of the circuit breaker 100 in operation, the protection faceplate of the protection devices of the electrical line can then be symmetrical.
• a reversal of the direction of rotation of the bar 26 has been chosen, that is to say that the connection area 5 to the trigger 7 is located towards the rear of the circuit breaker 100 and the upstream connection range 4 is forward, above.
• the movable contact bridge 22 is rotatable between an open position and a closed position of the contacts in a clockwise direction.
• the escape of the gas from the contact connected to the downstream range 5 which would have traditionally been downwardly directed and rear of the device is brought up and the front of the cutoff unit 10.
• the area placed at the back and bottom of the device corresponds to an area in which are placed the trigger 7 and possible supports fixing such as in particular a DIN rail.
• the substantially parallelepipedal shape of the casing of the casing 12 of the cut-off block 20 is extended on the front side by a first exhaust channel of the gases 38. Said first channel makes it possible to direct the cutoff gases of the range downstream 5 coupled to the trigger 7 to the upper part of the switchgear 100.
• the cutoff gases are discharged outside the housing through a through hole 40.
• the positioning of the opening opening 40 in the upper part of the cutting device and especially above the upstream range 4 also reduces the risk of rebooting the arc.
• the exhaust gas of the contact 41 connected to the upstream range 4 are also directed upwardly and forwardly of the breaking block 0 via at least a second exhaust channel 42.
• said at least one exhaust channel 42 is positioned at least in part in the large parallel faces 14 of the housing 12 of the breaking block 10.
• two lateral exhaust channels 42 are arranged in part outside the housing 12 of the cut-off block 10. These two channels are connected to one and the same breaking chamber 24.
• Each lateral exhaust channel 42 is connected inside the housing 12 by two orifices 44A, 44B.
• the portion of the external lateral flow channel 42 may preferably be hollowed into the wall of the housing 12.
• the gas exhaust ducts 38 and 42 respectively of a first and second breaking chambers 24 are of different lengths, the cutoff gases flowing in a first exhaust gas channel being intended for Venturi effect the gases flowing in a second channel.
• each part of the housing 12 is molded with internal arrangements allowing a relatively stable positioning of the various elements making up the breaking mechanism 20, in particular two symmetrical housings for each of the cutoff chambers 24, and a circular central housing for the installation of the bar 26.
• the unipolar blocks 10 are assembled via spacers 46 to form a double envelope 48. It is advantageous to take advantage of this architecture to integrate each lateral flow channel 42 in part with the spacer 46.
• the spacers 46 are made of molded plastic and mainly comprise a central partition 52 intended to be parallel to the large faces 14 of the cutoff blocks 10.
• each spacer 46 includes arrangements to define in part the second lateral channels 42 of gas evacuation.
• each lateral flow channel 42 is partially etched in the large outer face 14 of the housing 12 of the bulb 10, between the two through-holes 44A, 44B, and a corresponding element 68, etching and / or protruding contour on the central partition 52.
• each housing portion 12 comprises an orifice 34 in the shape of an arc of a circle allowing at least the mobilization of the rod 30. crossing e between the current flow position and the open position.
• said at least second exhaust gas channel 42 passes through at least one decompression chamber 43 comprising at least one wall covered by a metal sheet 85.
• the inner wall covered with said sheet is part of a decompression chamber 43.
• This metal sheet 85 constitutes a particle trap which aims on the one hand to capture the metal particles from the cut, in order to protect thermally plastic parts located downstream of the trap and on the other hand to reduce the temperature of the cutoff gases.
• the particle trap protects the plastic parts of the channel located behind said at least one metal sheet 85 and reinforces the sealing of the joint plane of the housing 12.
• At least one metal sheet 85 at least partially covering the inner wall of the gas exhaust channel allows good capture of the molten steel and copper balls, resulting from the erosion of the separators, the contacts and drivers during the break.
• Said at least one metal sheet has a minimum thickness to prevent its piercing by the molten balls.
• the minimum thickness is preferably between 0.3 and 3 mm and is to be adapted according to the cutoff energy of the product.
• Said at least one metal sheet 85 is made of steel, copper or an iron-based alloy.
• the inner wall of the exhaust channel covered with said at least one metal sheet 85 of the particle trap forms an angle ⁇ of between 45 ° and 140 ° with respect to the direction of gas flow.
• Said at least one metal sheet 85 at least partially covers the inner surface of the discharge channel.
• the metal sheet extends along the longitudinal axis of the channel.
• the total length L of internal wall covered with said at least one metal sheet 85 in the direction of flow is at least equal to the square root of the weakest flow section S of said channel measured upstream of said sheet.
• the greatest possible length is desirable to reduce the temperature of the gases.
• the minimum length required is expressed according to the following equation:
• said at least one metal sheet 85 extends over the internal perimeter P of the exhaust channel in a direction perpendicular to the direction of the gas flow.
• the minimum required distance I on which said sheet extends is expressed according to the following equation: Pm / 10 ⁇ l ⁇ Pm
• Pm is the average perimeter of the gas exhaust channel in which the particle trap is located.
• Said decompression chamber is preferably positioned as close as possible to the exit of the arc cutting chamber.
• the decompression chamber is placed under the bottom wall of the arc extension chamber 24.
• a gas exhaust channel 38 comprises a rotary valve 45 intended to be rotated by the passage of the cutoff gases. The rotation of the valve from a first position to a second position is intended to actuate triggering means of the cutoff device to cause the opening of the contacts.
• circuit breaker 100 makes it possible to best meet the following antinomic industrial constraints:
• the trigger 7 can be connected from below to the downstream range of the cut-off device 600, which gives the best accessibility to the connection screws by reversing the direction of rotation of the rotary cutoff bridge 22;
• the nose 9 of the cut-off device 600 is centered, in particular at 42.5 mm, thanks to the reversal of the direction of rotation in the cut-off blocks 10, which makes it possible to use symmetrical plastrons in the cabinets;
• the cutoff gases are not evacuated next to the trip unit 7, which limits the pollution on this element which can be sensitive, in particular in its electronic version, and frees up the volume;
• the exhaust gas cutoff is also not carried out under the connections 4, 5 of the circuit breaker 100, which limits the risks of ignition in cutoff;

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Applications Claiming Priority (3)

Publications (2)

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• 2010
  • 2010-08-30 US US13/496,793 patent/US20120175348A1/en not_active Abandoned
  • 2010-08-30 KR KR1020127006818A patent/KR101539832B1/ko active IP Right Grant
  • 2010-08-30 MX MX2012003123A patent/MX2012003123A/es active IP Right Grant
  • 2010-08-30 CN CN201080052208.8A patent/CN102612723B/zh active Active
  • 2010-08-30 EP EP10762709.3A patent/EP2478544B1/de active Active
  • 2010-08-30 BR BR112012005824-0A patent/BR112012005824B1/pt active IP Right Grant
  • 2010-08-30 JP JP2012529312A patent/JP5697671B2/ja active Active
  • 2010-08-30 PL PL10762709T patent/PL2478544T3/pl unknown
  • 2010-08-30 RU RU2012115452/07A patent/RU2538785C2/ru active
  • 2010-08-30 WO PCT/FR2010/000591 patent/WO2011033181A1/fr active Application Filing

Non-Patent Citations (1)

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