Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
  • H01H9/302—Means for extinguishing or preventing arc between current-carrying parts wherein arc-extinguishing gas is evolved from stationary parts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
  • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
  • H01H9/341—Barrier plates carrying electrodes
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
  • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
  • H01H9/346—Details concerning the arc formation chamber
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
  • H01H9/46—Means for extinguishing or preventing arc between current-carrying parts using arcing horns

Definitions

• the invention relates to a unitary cut-off unit for an electrical cut-off device.
• Said block comprises a housing developing along a median longitudinal plane and breaking means.
• Said means comprise at least one fixed contact comprising an electrical contact zone.
• At least one straight connection range connects the fixed contact to an electrical terminal.
• the cut-off means also comprise a movable contact comprising a body elongate along a longitudinal axis and having at least one end comprising a contact zone that can collaborate with a contact zone of a fixed contact.
• At least one arc extinguishing chamber comprises a metal wall composed of two parallel lateral flanges placed on either side of a median longitudinal plane and flanking one of the ends of the movable bridge over its entire displacement between a position of opening and a closed position of the contacts, said side flanges having an insulating layer on their inner face.
• a posterior wall connects the two lateral flanges to form a U-shaped metal wall.
• the invention also relates to a cut-off device comprising at least one unitary breaking unit.
• the other disadvantage is relative to the magnetic stress created on the arc. Indeed, as soon as the magnetic force created on the arc by the U is greater than the reverse force force in the direction of passage of the current, the arc then comes on the copper current passage and thus may cause a strong erosion of the contact support.
• Each arc extinction chamber of the breaking means of the breaking block according to the invention comprises a metal baffle, said baffle electrically connecting a fixed contact to a rear wall to provide electrical continuity and to form an upper part of the wall metal of said extinguishing chamber.
• the two parallel side flanges of an arc extinguishing chamber extend in a direction parallel to the median longitudinal plane so as to completely frame the contact area of the movable contact.
• the two lateral flanges extend so as to completely enclose the contact zone of the movable contact inside the arc extinguishing chamber.
• the movable contact comprises at least one arc horn, the arc horn extending beyond the contact zone in the direction of the rear wall of the arc extinguishing chamber.
• the arc horn is inclined relative to the longitudinal axis of the movable contact.
• the arc horn forms an opening angle with respect to the upper metal deflector, the opening angle being greater than 5 °.
• the two parallel side plates of an arc extinguishing chamber comprise internal surfaces covered with a gasogenic material.
• the housing is formed of two half-shells assembled to form an assembly of substantially parallelepipedal shape developing along a longitudinal plane, said housing comprising two main faces parallel to the longitudinal plane, two lateral faces, an upper face and a lower face. .
• the breaking means comprise two fixed contacts respectively comprising an electrical contact zone.
• Straight connection pads respectively connect said fixed contacts to an electrical terminal.
• the breaking means comprise a movable contact bridge comprising a body elongated along a longitudinal axis and having two ends, each end comprising a contact zone that can collaborate with a contact zone of a fixed contact.
• Said means further comprise two arc extinction chambers.
• the breaking device comprises an actuating device controlling the opening of the contacts by moving in translation the movable contact bridge between an open position and a closed position, moving in a direction perpendicular to the axis longitudinal.
• the cutoff device comprises a control subassembly of the actuating device of said at least one unitary breaking unit. Terminal blocks for connection are intended to be connected to the connection terminals of the at least one breaking block.
• the cut-off device has three unitary cut-off units synchronously controlled by the control subassembly.
• FIG. 1 represents a perspective view of the cut-off means in a closed position of the power contacts, of a breaking block according to one embodiment of the invention
• FIG. 2 represents a perspective view in an open position of the power contacts, of a breaking block according to FIG. 1;
• FIG. 3 represents an exploded perspective view of a breaking chamber of a cutoff unit according to FIG. 1;
• Figure 8 shows a side sectional view of a cutoff unit according to Figure 1;
• Figure 9 shows a perspective view of a cut-off device according to one embodiment of the invention.
• the unitary cutoff unit 80 comprises a casing 31 made of molded plastic material in which electrical contacts are arranged.
• the housing 31 is formed of two assembled half-shells 80A to form an assembly of substantially parallelepiped shape developing along a longitudinal plane XZ.
• the housing 31 then has two main faces 81 arranged parallel to the median longitudinal plane XZ.
• Said housing further comprises two lateral faces 82, an upper face 83 and a lower face 84.
• an electromagnet acts on the actuating mechanism 34 to control the closing and opening of the electrical contacts.
• the unitary breaking block 80 comprises electrical breaking means 30 comprising at least one fixed contact 32 comprising an electrical contact zone 37.
• the electrical breaking means 30 comprise two contacts.
• the fixed contacts 32 respectively comprise an electrical contact zone 37.
• the cut-off means comprise a movable contact 33 comprising an elongate body along a longitudinal axis X and having at least one end comprising a contact zone 36 capable of collaborating with a contact zone 37 of a fixed contact 32.
• the electrical breaking means 30 comprise a movable contact bridge 33 having an elongated body along a longitudinal axis X. Said bridge has two ends. Each end has a contact zone 36 which can collaborate with a contact zone 37 of a fixed contact 32 in a closed position of the breaking means. In this closed position, an elastic means 25, such as in particular a helical spring, ensures between the contact zones 36 and 37, a contact pressure sufficient to ensure the passage of the current in good conditions.
• Straight connection pads 45 respectively connect said fixed contacts 32 to an electrical terminal.
• the movable contact bridge 33 can move in translation under the action of the actuating device 34. Indeed, the actuating mechanism 34 controls the opening of the electrical contacts by translational movement of the bridge movable contact 33 in a direction perpendicular to the longitudinal axis X. The movable contact bridge 33 moves between an open position and a closed position of the electrical contacts.
• each opening volume 35 is associated with an arc extinguishing chamber 24.
• Each arc extinguishing chamber 24 opening on the opening volume 35 is delimited by two flanges 68 of material ferromagnetic.
• the two lateral flanges 68 are parallel and placed on either side of a median longitudinal plane XZ.
• the two lateral flanges 68 are arranged to frame one of the ends of the movable bridge 33 over its entire displacement between the open position and the closed position. In other words, the two side flanges 68 are spaced from each other to allow the displacement of the movable contact bridge 33.
• the inner walls of said flanges 38 comprises a layer 38 of insulating material.
• the positioning of the layers 38 of insulating material on the flanges 68 avoids the attachment of the arc on the inner walls of said flanges 68.
• These layers 38 are preferably made of gas-forming material.
• the extinction chamber 24 is also delimited by a rear wall 72 placed perpendicular to the XZ plane. Said posterior wall is remote from the opening volume 35 to be positioned opposite an opening volume of the contact zones 36, 37.
• the rear wall 72 connects the two lateral flanges 68 so as to form a metal assembly substantially U-shaped.
• the rear wall 72 connects the two flanges on part of their height.
• the two lateral flanges 68 extend in a direction parallel to the median longitudinal plane XZ so as to completely frame the contact zone 36 of the movable contact bridge 33. More specifically, the two flanges side walls 68 extend so enclose complement the contact zone 36 of the movable contact bridge 33 inside the arc extinguishing chamber 24. In other words, the development of the flanges in length allows to close each opening volume laterally 35 so as to channel the escape of ionized particles at the time of opening of the electrical contacts.
• the wall of each arc extinguishing chamber 24 comprises a metal upper baffle 69.
• said baffle electrically connects a fixed contact 32 to a posterior wall 72 to form an upper portion of the metal wall of said extinguishing chamber.
• the movable contact bridge 33 comprises arc horns 39 at each of the two ends. Said arc horns extend beyond the contact zones towards the rear walls 72 of arc extinguishing chambers 24.
• the arc horns 39 are inclined with respect to the longitudinal axis X of the movable contact bridge 33. More specifically, the arc horns 39 form an opening angle ⁇ relative to the upper metal deflector 69.
• the opening angle ( ⁇ ) is preferably greater than 5 °.
• each upper baffle 69 is laterally bordered by a layer of preferably gas-forming insulating material.
• the apparatus operates in the following manner. During the occurrence of an electric arc at the time of the separation of the contacts, an electromagnetic field is induced by the current flowing in the conductors, in particular in the fixed contacts 32, the movable contact bridge 33 and the arc. This field is induced between the flanges 68 of the substantially U-shaped ferromagnetic assembly. This magnetic field then creates an electrodynamic force on the electric arc. This force pushes the arc in the arc extinction chamber 24 towards the rear wall 72 metal.
• the arch foot can then jump on the upper deflector 69 thus avoiding premature wear of the contacts.
• the arc is then positioned between the horn 39 and the wall 72 to be cooled.
• the upper baffle 69 preferably comprises crimping tabs 77 intended to collaborate with notches present the fixed electrical contact 32. This crimping ensures electrical continuity between the fixed contact 32 and upper deflector 69.
• the invention also relates to a cut-off device 100 such as in particular a contactor.
• the cutoff device then comprises at least one unit block 80 of cutoff as defined above.
• the cut-off device 100 may be intended for a multipole contactor. Said contactor then comprises several identical breaking blocks and all the actuating devices 34 of said devices can be driven by an electromagnet-type actuator.
• the device further comprises a control subassembly 104 of the actuating devices 34 of the unitary cut-off units 80.
• the subassembly 104 may be an electromagnetic actuator when it is intended to control switchgear blocks of a contactor .
• the subassembly 104 may be a mechanism when it is intended to control breaker blocks of a circuit breaker.
• the cut-off device 100 comprises connection terminals 105 intended to be connected to the connection terminals 45 of the at least one breaking block.
• the breaking device comprises three unitary breaking units 80.
• the three unitary breaking units 80 are then controlled in a synchronized manner by the control subassembly 104 acting on the actuating devices 34. unitary blocks of cut.
• the base 1 10 then comprises three imprints 120 intended to collaborate respectively with a unitary block of cutoff 80.

Landscapes

• Arc-Extinguishing Devices That Are Switches (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=47989125

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (1)

Family Cites Families (13)

• 2012
  • 2012-12-18 FR FR1262253A patent/FR2999783A1/fr not_active Withdrawn
• 2013
  • 2013-10-29 JP JP2015548698A patent/JP6411363B2/ja active Active
  • 2013-10-29 CN CN201380065532.7A patent/CN104854674B/zh active Active
  • 2013-10-29 ES ES13803095.2T patent/ES2636597T3/es active Active
  • 2013-10-29 EP EP13803095.2A patent/EP2936529B1/de active Active
  • 2013-10-29 WO PCT/FR2013/052580 patent/WO2014096583A1/fr active Application Filing

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events