EP3699943A1 - Magnetauslöser für stromunterbrechungsgerät - Google Patents

Magnetauslöser für stromunterbrechungsgerät Download PDF

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Publication number
EP3699943A1
EP3699943A1 EP19315007.5A EP19315007A EP3699943A1 EP 3699943 A1 EP3699943 A1 EP 3699943A1 EP 19315007 A EP19315007 A EP 19315007A EP 3699943 A1 EP3699943 A1 EP 3699943A1
Authority
EP
European Patent Office
Prior art keywords
movable part
coil
movable
contact
spring element
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
EP19315007.5A
Other languages
English (en)
French (fr)
Other versions
EP3699943B1 (de
Inventor
Loïc Meyer
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.)
Hager Electro SAS
Original Assignee
Hager Electro SAS
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 Hager Electro SAS filed Critical Hager Electro SAS
Priority to EP19315007.5A priority Critical patent/EP3699943B1/de
Priority to CN202020189984.3U priority patent/CN213026010U/zh
Publication of EP3699943A1 publication Critical patent/EP3699943A1/de
Application granted granted Critical
Publication of EP3699943B1 publication Critical patent/EP3699943B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/34—Electromagnetic mechanisms having two or more armatures controlled by a common winding
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/34—Electromagnetic mechanisms having two or more armatures controlled by a common winding
    • H01H71/345—Electromagnetic mechanisms having two or more armatures controlled by a common winding having a delayed movable core and a movable armature
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms

Definitions

  • the present invention relates to a magnetic trip unit for an electrical breaking device of the circuit breaker or contactor type as well as such an electrical breaking device.
  • Such triggers generally include a coil and a yoke forming a core of the coil.
  • WO 2012/140 145 A1 discloses an apparatus of the circuit breaker or contactor type, having a low power dissipation allowing its use in an electrical distribution panel with a high rating in a standard size. This is obtained by adding a current path bypassing the bimetallic strip and comprising a shunt contact able to be opened by the double actuation magnetic actuator.
  • a first movable core When a current greater than a first thermal threshold passes through the coil, a first movable core is pressed against a fixed core and slightly pushes back the shunt contact. Following the opening of the shunt contact, all of the current then passes through the bimetallic strip, which acts as a current integrator in order to respect the timing characteristics of the circuit breakers. Thus, the bimetallic strip can trigger a lock on the device. The required opening distance is thus obtained for the two contacts of the device.
  • the first mobile core must remain pressed against the fixed core for a period of the order of a few seconds. Since electricity distribution networks generally operate on alternating current at 50 or 60 Hz, this means that the magnetic force on the first moving core will have to counteract the contact force of the shunt contact, while the current passing through the coil will go through zero every 10 ms. This is made possible by the use of a Grander turn associated with a high-performance magnetic circuit and / or by the use of a large number of ampere-turns.
  • the first mobile core When a current greater than a second magnetic threshold passes through the coil, the first mobile core will quickly close (because its activation threshold is significantly lower), a magnetic shunt zone of the first mobile core will saturate, and a second mobile core will close.
  • the closing of the second moving core can trigger the lock in order to open a second locking contact of the lock.
  • the second moving core moves and the two contacts are opened one after the other (first the shunt contact opens followed by the cut-off contact).
  • the two mobile cores are coaxial.
  • the first movable core slides inside the second movable core.
  • the two cores actuate a single striker.
  • the two mobile cores are returned to a position separated from the fixed core by means of a single spring and a striker.
  • the apparatus of the prior art has the drawback that it is difficult to ensure that the first movable core keeps the shunt contact open with an alternating current. This is due to the fact that the Servicer coil has a high force / current ratio in the vicinity of the closed position of the first movable core.
  • a guide and insulation tube of the device constitutes a parasitic air gap which significantly degrades this ratio. This has the consequence of increasing the number of turns of the coil.
  • the second mobile core must at the same time push back the shunt contact, compress the spring already prestressed by the first mobile core, actuate the trigger and possibly tear off the second cut-off contact. This requires a great magnetic force, which also has the consequence of increasing the number of turns of the coil.
  • the variability of the shunt contact holding force influences the activation threshold of the second movable core, which makes the product more difficult to adjust and manufacture.
  • the magnetic force on the second mobile core of the device known from the prior art only becomes significant from the moment when the magnetic shunt zone goes into saturation. It is therefore important that this section is small compared to that of the cylinder head.
  • the configuration with the cylinder head folded in half is not favorable to a large cylinder head section, which has the effect of making the apparatus difficult to manufacture.
  • the object of the present invention is to alleviate these drawbacks and to provide a magnetic trip device for an electrical switching device of the circuit breaker or contactor type having a reduced size and allowing easy adjustment.
  • the magnetic trip unit for an electrical circuit breaker or contactor type device comprises a coil, a yoke forming a core of the coil, a first spring element and a second spring element, the yoke comprising a first fixed part, a second movable part and a third movable part, the second movable part being movable relative to the first fixed part between a separated position, in which the second movable part is located at a distance from the first part fixed, and a contiguous position, in which the second movable part is in contact with the first fixed part, the third movable part being movable relative to the first fixed part between a rest position and an actuation position, the first spring element being prestressed so as to maintain the second movable part in the separated position, the second spring element being prestressed so as to maintain the third movable part in the rest position, the coil, the yoke, the first spring element and the second spring element being configured and arranged to cause a displacement
  • the first fixed part and the second movable part form a closed magnetic circuit when the second movable part assumes the contiguous position.
  • the first fixed part comprises a central part extending inside the coil.
  • the first fixed part further comprises a Trainr coil arranged on the central part.
  • the first fixed part further comprises at least one peripheral part extending outside the coil.
  • the first fixed part comprises a cavity in which the third movable part is housed and in which the movable part slides between the rest position and the actuation position.
  • the cavity is present in the central part.
  • the cavity has a shape complementary to the shape of the third mobile part.
  • the third movable part is arranged at least partially inside the coil when the third part assumes the rest position and / or the actuation position.
  • an air gap is formed between the first fixed part and the second movable part when the second movable part assumes the separated position.
  • the air gap is formed inside the coil and outside the coil.
  • the second movable part is movable in translation between the separated position and the contiguous position and / or in that the third movable part is movable in translation between the rest position and the actuation position.
  • the present invention also relates to an electrical switch-off device of the circuit breaker or contactor type, comprising a trip device according to the invention, a lock, a first circuit comprising a first contact and a second circuit mounted in parallel with the first circuit and comprising a second contact, the coil, the yoke, the first spring element, the second spring element, the first contact and the second contact being configured and arranged to cause the opening of the first contact following a displacement of the second movable part from the separated position towards the contiguous position when the coil is traversed by a current of a first intensity and configured and arranged to cause the opening of the second contact and the opening of the lock following a displacement of the third movable part from the rest position towards the actuation position when the coil is traversed by a current of a second intensity greater than the first intensity.
  • the object of the present invention is to overcome these drawbacks.
  • the embodiment relates to an electrical switching device of the circuit breaker or contactor type comprising a trip device 20.
  • the trip unit 20 is provided with a coil 40, a yoke 60 forming a core of the coil 40, a first spring element. 80 and a second spring element 82.
  • the yoke 60 comprises a first fixed part 62, a second movable part 64 and a third movable part 66.
  • the electrical switchgear further comprises a lock (not shown in the figures), a first circuit 12 comprising a first contact 11 and a second circuit 14 mounted in parallel with the first circuit 12 and comprising a second contact 13.
  • a bimetallic strip. (not shown) can be mounted in the second circuit 14. The bimetallic strip can be configured to open the lock of the electrical breaking device.
  • the second movable part 64 is movable relative to the first fixed part 62 between a separated position PE, in which the second movable part 64 is located at a distance from the first fixed part 62, and a contiguous position PC, in which the second part movable 64 is in contact with the first fixed part 62.
  • the third movable part 66 is movable relative to the first fixed part 62 between a rest position PR and an actuation position PA.
  • the first spring element 80 is prestressed so as to maintain the second movable part 64 in the separated position PE.
  • the second spring element 82 is prestressed so as to keep the third movable part 66 in the rest position PR.
  • the coil 40, the yoke 60 and the first spring element 80 are configured and arranged to cause a displacement of the second movable part 64 from the separated position PE to the contiguous position PC when the coil 40 is traversed by a current of a first intensity.
  • the displacement of the second movable part 64 from the separated position towards the contiguous position can cause the opening of the first contact 11. Following the opening of the first contact 11, the first circuit 12 is no longer traversed by the current. Current flows only in the second circuit 14.
  • the coil 40, the yoke 60 and the second spring element 82 are configured and arranged to cause a displacement of the third movable part 66 from the rest position PR to the actuation position PA when the coil 40 is traversed by a current d 'a second intensity greater than the first intensity.
  • the movement of the third movable part 66 from the rest position PR to the actuation position PA can cause the opening of the second contact 12 and the opening of the lock.
  • the first fixed part 62 and the second movable part 64 form a closed magnetic circuit when the second movable part 64 takes the contiguous position PC.
  • an air gap 70 is formed between the first fixed part 62 and the second movable part 64. This is disclosed in the figures 1 , 4 and 6 .
  • the first fixed element 62 has a central portion 63 which extends inside the coil 40.
  • a saucer turn 65 may be present in the central portion 63. This is particularly disclosed in figures 1 , 4 , 5 and 7 .
  • the trigger 20 can include a striker 90 which moves together with the third movable part 66.
  • the striker 90 can be in the form of a long nail.
  • the first fixed part 62 can be provided with a bore 71 in which the striker 90 can slide when it is jointly moved with the third mobile part 66.
  • the second mobile part 64 can also be provided with a bore. 73.
  • a point 92 of the striker 90 can be used to open the second contact 14.
  • the striker 90 and / or the bores 71, 73 can be centered relative to the coil 40.
  • the striker 90 can be fixed to the third movable part 66 .
  • the trigger 20 may further include a return 84.
  • the return 84 is mechanically linked to the first spring 80, to the second movable part 64 of the yoke 60 and to the first contact 12.
  • the return 84 allows a movement of the cylinder to be reflected. second movable part 64 on the first contact 12.
  • the movement of the second movable part 64 from the separated position to the contiguous position is effected against the force of the spring 80.
  • the movement of the third movable part 66 from the rest position to the actuation position s 'performs against the second spring 82.
  • the first fixed part 62 can at least comprise a peripheral part 67 extending outside the coil 40.
  • the first fixed part comprises a peripheral part 67.
  • the air gap 70 can therefore be formed at the inside and outside of the coil 40, that is to say between the second mobile part 64 and respectively the central part 65 and the peripheral parts 67 of the first fixed part 62.
  • the yoke 60 may be formed of a ferromagnetic material, preferably an iron alloy.
  • the first fixed part 62 of the yoke 60 may include a cavity 69 in which the third movable part 66 is housed and in which the third movable part 66 slides between the rest position PR and the actuation position PA.
  • the cavity 69 can be present in the central part 63.
  • the cavity 69 can have a shape complementary to the shape of the third movable part 66.
  • the cavity 69 and the third movable part 66 have an essentially cylindrical shape.
  • the third movable part 66 can be arranged at least partially inside the coil 40 when the third movable part 66 assumes the rest position PR and / or the actuation position PA.
  • the second movable part 64 can be movable in translation between the separated position PE and the contiguous position PA.
  • the third movable part 66 can be movable in translation between the rest position PR and the actuation position PA.
  • the first spring 80 and the second spring 82 are independent springs, i.e. their respective characteristics are independent of the state of the other of the springs 80, 82. This further facilitates the adjustment of the apparatus. .
  • the second return spring 82 can be arranged inside the cavity 69 as well as inside a recess 75 present in the third movable part 66.
  • the first electrical circuit 12 and the second electrical circuit 14 are closed and traversed by the current and the second movable part 64 is kept in the separated position PC by the first return spring 80 and through the return 84.
  • the third movable part 66 is held in the rest position PR by the second return spring 82.
  • the current flowing through the coil 40 is not sufficient so that the magnetic forces exceed those of the springs.
  • the second movable part 64 moves towards the contiguous position PC and causes, by means of the return 84, an opening of the first contact 11.
  • the magnetic circuit is completely closed.
  • the holding force is particularly great and makes it possible to keep the first contact 11 open over several alternations.
  • the current then passes only through the cut-off side, that is to say through the second circuit 14, into which the bimetallic strip is connected.
  • the bimetallic strip is responsible for triggering the lock and therefore the complete opening of the two contacts 11, 13.
  • the second movable part 64 moves towards the contiguous position PC.
  • the current then passes only through the cut-off side, that is to say the second circuit 14.
  • the magnetic shunt zone is saturated, which causes a substantial magnetic force on the third mobile part 66.
  • the third mobile part 66 pushes, via the striker 90, the opening of the lock.
  • the third movable element 66 pushes sufficiently fast and far enough for the trip unit to pull out the contacts.
  • the pre-opening of the first contact 11 (shunt contacts) is mechanically guaranteed and the breaking dynamics on the second contact 13 (breaking) is preserved.
  • the surface of the air gap 70 is particularly important because it combines the internal and external sections of the coil 40.
  • the magnetic circuit is entirely formed by the yoke 60. There is therefore no longer the parasitic air gap in this position.
  • the electrical switching device of the embodiment is therefore particularly efficient in the vicinity of this position and maximizes the effect of the Servicer turn 65. 1.5 turns may be sufficient for the coil 40.
EP19315007.5A 2019-02-21 2019-02-21 Magnetauslöser für stromunterbrechungsgerät Active EP3699943B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19315007.5A EP3699943B1 (de) 2019-02-21 2019-02-21 Magnetauslöser für stromunterbrechungsgerät
CN202020189984.3U CN213026010U (zh) 2019-02-21 2020-02-20 用于电气切断装置的磁致动器和电气切断装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19315007.5A EP3699943B1 (de) 2019-02-21 2019-02-21 Magnetauslöser für stromunterbrechungsgerät

Publications (2)

Publication Number Publication Date
EP3699943A1 true EP3699943A1 (de) 2020-08-26
EP3699943B1 EP3699943B1 (de) 2022-05-11

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ID=65729271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19315007.5A Active EP3699943B1 (de) 2019-02-21 2019-02-21 Magnetauslöser für stromunterbrechungsgerät

Country Status (2)

Country Link
EP (1) EP3699943B1 (de)
CN (1) CN213026010U (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206578A (en) * 1961-10-27 1965-09-14 Westinghouse Electric Corp Circuit breaker with adjustable third fluid flow time delay
DE2407134B1 (de) * 1974-02-15 1975-07-03 Licentia Gmbh Strombegrenzender Leitungsschutzschalter
EP0633589A1 (de) * 1993-07-06 1995-01-11 Circuit Breaker Industries Limited Lastschalter Mechanismus
WO2005050690A1 (en) * 2003-11-21 2005-06-02 Eti Elektroelement D.D. Electric automatic switch
WO2009024176A1 (de) * 2007-08-21 2009-02-26 Siemens Aktiengesellschaft Magnetic/hydraulic trip unit for molded case circuit breakers (mccbs)
WO2012140145A1 (de) 2011-04-13 2012-10-18 Jozef Smrkolj Kontakteinrichtung und deren antrieb für schutzschaltgeräte
WO2013024061A1 (de) * 2011-08-12 2013-02-21 Eaton Industries (Austria) Gmbh Auslöser für einen schutzschalter
WO2014140461A1 (fr) * 2013-03-12 2014-09-18 Hager-Electro Sas Actionneur magnetothermique

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206578A (en) * 1961-10-27 1965-09-14 Westinghouse Electric Corp Circuit breaker with adjustable third fluid flow time delay
DE2407134B1 (de) * 1974-02-15 1975-07-03 Licentia Gmbh Strombegrenzender Leitungsschutzschalter
EP0633589A1 (de) * 1993-07-06 1995-01-11 Circuit Breaker Industries Limited Lastschalter Mechanismus
WO2005050690A1 (en) * 2003-11-21 2005-06-02 Eti Elektroelement D.D. Electric automatic switch
WO2009024176A1 (de) * 2007-08-21 2009-02-26 Siemens Aktiengesellschaft Magnetic/hydraulic trip unit for molded case circuit breakers (mccbs)
WO2012140145A1 (de) 2011-04-13 2012-10-18 Jozef Smrkolj Kontakteinrichtung und deren antrieb für schutzschaltgeräte
WO2013024061A1 (de) * 2011-08-12 2013-02-21 Eaton Industries (Austria) Gmbh Auslöser für einen schutzschalter
WO2014140461A1 (fr) * 2013-03-12 2014-09-18 Hager-Electro Sas Actionneur magnetothermique

Also Published As

Publication number Publication date
CN213026010U (zh) 2021-04-20
EP3699943B1 (de) 2022-05-11

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