EP0406130B1 - Disjoncteur limiteur équipé d'un dispositif retardateur de retombée de contact à effet électromagnétique - Google Patents

Disjoncteur limiteur équipé d'un dispositif retardateur de retombée de contact à effet électromagnétique Download PDF

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Publication number
EP0406130B1
EP0406130B1 EP90420285A EP90420285A EP0406130B1 EP 0406130 B1 EP0406130 B1 EP 0406130B1 EP 90420285 A EP90420285 A EP 90420285A EP 90420285 A EP90420285 A EP 90420285A EP 0406130 B1 EP0406130 B1 EP 0406130B1
Authority
EP
European Patent Office
Prior art keywords
latch
circuit breaker
limiting circuit
contact
movable contact
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.)
Expired - Lifetime
Application number
EP90420285A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0406130A1 (fr
Inventor
Jean-Pierre Nebon
Pascal Dudon
Patrick Coudert
Robert Morel
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 EP0406130A1 publication Critical patent/EP0406130A1/fr
Application granted granted Critical
Publication of EP0406130B1 publication Critical patent/EP0406130B1/fr
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
    • 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
    • H01H77/10—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 electrodynamic opening
    • H01H77/102—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 electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—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 electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • 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
    • 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
    • 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
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring
    • 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 lock is formed by a hooking blade capable of cooperating with a notch provided at one of the ends of the movable contact arm on the side of the bar.
  • the distance of the lock from the contact parts between which the arc is established requires the installation of a steel ring surrounding the bar to reinforce the effect of electromagnetic attraction on the lock.
  • the latching effect of the movable contact in the repelled position has the disadvantage of preventing any possibility of selectivity in the circuit.
  • the dropout takes place by the rotation of the bar after triggering of the mechanism.
  • Another anti-fallout device uses a different technique implementing the acceleration of the mobile contact during the electrodynamic repulsion to act initially by mechanical effect on the lock, which is then attracted completely. to the active position by magnetic attraction.
  • the object of the invention is to improve the production of an electromagnetic anti-fallout lock for a limiting circuit breaker.
  • the electromagnetic lock comprises a magnetic circuit surrounding the support arm in the vicinity of the first and second contacts to obtain maximum electromagnetic attraction from the birth of the arc, causing the lock to move rapidly towards the active position, said circuit magnetic being equipped with support means in the form of ramps urging the lock to an inactive position by the action of returning the movable contact in the closing direction.
  • the lock is electrically isolated from the support arm by an insulating coating.
  • the electromagnetic lock comprises a magnetic circuit formed by a pair of semi-mobile stirrups arranged symmetrically with respect to the median plane of the pole so as to define a first lower air gap and a second upper air gap, each stirrup being housed in an isolation screen and having an extension shaped as a retaining ramp, on which the mobile contact rests in the restraint, on which the movable contact bears in the active position of said lock.
  • the arc is pinched in the upper air gap when the lock is in the active position.
  • each stirrup has a predetermined inclination relative to the median plane which contributes to the release of the lock towards the inactive position under the action of the restoring force of the movable contact.
  • Each stirrup has a first pole face separated from a second pole face by a semi-open notch framing the upper branch of the loop of the support arm when the latch is actuated towards the active position.
  • the electromagnetic lock comprises a fixed U-shaped magnetic circuit and a pivoting pallet urged by a return spring in engagement against the pole face of the magnetic circuit.
  • a breaking pole 10 of a multipole limiting circuit breaker, with molded insulating housing 12 comprises a rotary contact 14 with double breaking.
  • the central part of the rotary contact 14 is mounted in a housing of a rotary switching bar 1 6, common to all of the poles.
  • the general structure of pole 10 is described in document EP-A-314,540.
  • the rotary contact 14 comprises a pair of opposite lever arms 18, 20, each having at their ends a contact piece 22, 24 cooperating with a fixed contact 26, 28 conjugated in the form of a pellet.
  • Each fixed contact 26, 28 is secured to the internal end of an arm 30, 32 of conductive material, having a loop or U shape.
  • the electrical connection of the pole 10 takes place by means of two connection pads 34 , 36 arranged at the outer ends of the support arms 30, 32 passing through the insulating housing 12.
  • the rotary contact 14, and the two support arms 30, 32 constitute the active parts made of copper.
  • Two arc extinguishing chambers 38.40 arranged on either side of the bar 16 are associated with the pairs of contacts 22.26; 24.28.
  • a system of springs 42 makes it possible to obtain the contact pressure in the closed position of the movable contact 14.
  • the rotary bar of insulating material is mounted for rotation about an axis 43 between a first and a second position corresponding respectively to the closing and to a normal opening of the contacts.
  • the axis 43 extends in the central zone of the housing 12, perpendicular to the plane of FIG. 1.
  • the bar 16 serves as a drive member for all of the rotary contacts 14 of the different poles of the circuit breaker, and is coupled to the control mechanism (not shown), which is actuated manually by a joystick, and automatically by a selective trigger.
  • the rotation of the bar 16 to the second position occurs when the response time of the mechanism has elapsed, so as to confirm the definitive opening of the circuit breaker.
  • This rotational movement of the bar 16 takes place during a second phase of mechanical actuation of the mechanism, which takes over from the first repulsion phase.
  • the first phase is not operational when the intensity of an overload current is below the repulsion threshold.
  • the current limiting effect does not exist in this case, and it will be necessary to wait for the intervention of the bar 16 after tripping of the mechanism, to ensure the normal automatic opening of the circuit breaker.
  • the anti-drop system of the movable contact 14 of each pole comprises a pair of electromagnetic latches 44, 46 (FIG. 1), arranged on either side of the bar 16, in the vicinity of the pairs of contacts (22 , 26, 24, 28) corresponding.
  • the structure of the two locks 44, 46 is identical, and only that of the lock 44 will be described in detail with reference to FIGS. 2 and 3.
  • the electromagnetic latch 44 is made up of two semi-mobile stirrups 48.50 made of ferromagnetic material, in particular steel, cooperating with a spring return leaf 52.
  • the two stirrups 48.50 have a U or C shape, and are arranged opposite one another, and symmetrically with respect to the vertical median plane of trace 54, so as to surround the upper branch of the support arm 30 at the level of the fixed contact 26.
  • Each stirrup 48.50 has a first pole face 56 vertically separated from a second pole face 58 by a semi-open notch 60 capable of conforming to the lateral configuration of the support arm 30.
  • each bracket 48.50 is equipped with an extension shaped as a ramp 62 for retaining having a predetermined inclination, relative to the second pole face 58.
  • the leaf spring 52 extends in the longitudinal direction of the axis 43 of the bar 16 and is supported by its opposite ends on two lugs 64,66 belonging to the two symmetrical stirrups 48.50.
  • the curved middle part of the spring leaf 52 is interposed between the first pole faces 56 and the lower branch of the support arm 30.
  • each stirrup 48.50 are advantageously covered by a coating 68 of gas-generating insulating material, in particular polyamide.
  • the entire surface of the stirrups 48.50 can be coated with this insulating material, except for the first pole faces 56 delimiting the lower air gap 70.
  • the semi-movable stirrups 48.50 of the latch 44 extend into housings 72.74 confined by two fixed symmetrical screens 76.78 projecting from the opposite side walls of the housing 12 and coming from molding with the latter.
  • the presence of these 76.78 dust screens prevents the penetration of beads or particles behind the 48.50 stirrups, and contributes to strengthening the dielectric strength of the circuit breaker.
  • the return leaf spring 52 ensures maximum spacing between the two stirrups 48.50, which are held in abutment against the internal wall of the housing 12,
  • the latch 44 is open and in a stable inactive position, ready to allow free movement of the movable contact 14 in good time.
  • the latch 44 During manual opening of the circuit breaker by the handle, the latch 44 remains stationary in the inactive position. So is even during an automatic opening by triggering of the mechanism, caused by the detection of an overload current below the repulsion threshold.
  • the passage in the pole 10 of a strong current, in particular of short-circuit higher than said threshold causes the electrodynamic repulsion of the movable contact 14, which is propelled during the first phase towards the open position, while the bar 16 remains stationary in the first position.
  • the displacement by repulsion of the movable contact 14 is reinforced by the presence of the magnetic circuit constituted by the two stirrups 48, 50 of the latch 44.
  • the direction of flow of the current I in the pole 10 is indicated by way of example in FIG. 3 , and it is noted that this current I generates an electromagnetic field B which closes by the two lower gaps 70 and upper 80, formed respectively between the first pole faces 56, and between the second pole faces 58 of the latch 44.
  • the presence of the latch 44 in the vicinity of the contacts 22, 26 makes it possible to have a large electromagnetic field for the attraction of the two stirrups 48.50 towards the active position.
  • the stirrups 48, 50 are shaped according to a clamp, which is closed in the active position.
  • the inclination of the ramps 62 for retaining the movable contact 14 contributes to the release of the stirrups 48.50 towards the inactive position of the latch 44.
  • An acute angle is formed between each ramp 62 and the vertical median plane of trace 54. This results in a progressive opening of the clamp towards the inactive position by the action of falling down of the movable contact 14.
  • the arc is pinched in the upper air gap 80 when the latch 44 is in the active position.
  • the presence of the insulating coating 68 on the two stirrups 48.50 contributes to improving the extinction of the arc in the chamber 38 by gasogenic effect.
  • a deformable insulating protective sheet 90 in particular made of polytetrafluoroethylene, is inserted between the upper branch of the support arm 30 and the notches 60 of the two stirrups 48.50, of the latch 44 to prevent any penetration of balls or other metallic particles into the 'air gap 70 lower.
  • the electromagnetic lock 146 of the movable contact 14 comprises a fixed magnetic circuit 100 in the shape of a U, and a pallet 102 articulated on an axis 104.
  • a spring 106 urges the pallet 104 into engagement against the pole face of the magnetic circuit 100.
  • the lever arm 20 of the movable contact 14 is provided with a retaining lug 108 cooperating with a hooking ramp 110 located in the intermediate part of the pallet 102.
  • the oblique ramp 110 has an angle 111 of inclination (approximately 10 degrees) with normal.
  • the pallet 102 In the closed position of the limiting circuit breaker, the pallet 102 is applied against the magnetic circuit 100 by the return force of the spring 106.
  • the contact piece 24 of the movable contact 14 is in engagement with the fixed contact 28.
  • the circuit 100 is covered by an insulating coating 114.
  • the lug 108 abuts against the pallet 102, and moves it away from the pole face of the magnetic circuit 100 against the restoring force of the spring 106. After passing the neck 112, the lug 108 is housed in the hollow of the ramp 110. The magnetic field B generated by the arc current I then applies the paddle 102 against the magnetic circuit 100 and the movable contact 14 remains blocked by the lug 108 in the open position.
  • the bar 16 rotates counterclockwise, and drives the movable contact 14 in the same direction.
  • the angle 111 of inclination of the ramp 110 allows the pallet 102 to be released under the action of the unlocking torque generated by the relaxation of the spring system 42 of contact pressure. This unlocking torque prevails over the torque implemented by the return spring 106, and the pallet 102 pivots clockwise to allow the displacement of the movable contact 14 towards the closed position.
  • the pivoting movement of the stirrups 48, 50 towards the inactive position under the return effect of the movable contact 14 after the arc has been extinguished is preceded by a downward translation movement (see arrow F) of low amplitude.
  • This translational movement is authorized by the presence of a clearance J between the base of the stirrups, and the lower branch of the support arm 30, and of a second leaf spring 152 having a curved middle part which urges the stirrups 48, 50 against the upper arm 30.
  • the invention also applies to a modular limiter block that can be coupled and electrically connected to a standard circuit breaker.
  • the mobile contact can also be a single break.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP90420285A 1989-06-26 1990-06-15 Disjoncteur limiteur équipé d'un dispositif retardateur de retombée de contact à effet électromagnétique Expired - Lifetime EP0406130B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8908589A FR2648952B1 (fr) 1989-06-26 1989-06-26 Disjoncteur limiteur equipe d'un dispositif retardateur de retombee de contact a effet electromagnetique
FR8908589 1989-06-26

Publications (2)

Publication Number Publication Date
EP0406130A1 EP0406130A1 (fr) 1991-01-02
EP0406130B1 true EP0406130B1 (fr) 1995-01-18

Family

ID=9383192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420285A Expired - Lifetime EP0406130B1 (fr) 1989-06-26 1990-06-15 Disjoncteur limiteur équipé d'un dispositif retardateur de retombée de contact à effet électromagnétique

Country Status (7)

Country Link
US (1) US5029301A (es)
EP (1) EP0406130B1 (es)
JP (1) JPH0337931A (es)
CA (1) CA2019492A1 (es)
DE (1) DE69016111T2 (es)
ES (1) ES2069721T3 (es)
FR (1) FR2648952B1 (es)

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JPH0337931A (ja) 1991-02-19
DE69016111D1 (de) 1995-03-02
ES2069721T3 (es) 1995-05-16
CA2019492A1 (en) 1990-12-26
EP0406130A1 (fr) 1991-01-02
FR2648952A1 (fr) 1990-12-28
FR2648952B1 (fr) 1991-09-13
DE69016111T2 (de) 1995-08-10
US5029301A (en) 1991-07-02

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