EP0635859B1 - Disjoncteur pourvu d'un mécanisme de commande à accrochage piloté par un propulseur électromagnétique - Google Patents
Disjoncteur pourvu d'un mécanisme de commande à accrochage piloté par un propulseur électromagnétique Download PDFInfo
- Publication number
- EP0635859B1 EP0635859B1 EP19940410048 EP94410048A EP0635859B1 EP 0635859 B1 EP0635859 B1 EP 0635859B1 EP 19940410048 EP19940410048 EP 19940410048 EP 94410048 A EP94410048 A EP 94410048A EP 0635859 B1 EP0635859 B1 EP 0635859B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit breaker
- cover
- contact
- arm
- movable
- 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
Links
- 239000000463 material Substances 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 150000001408 amides Chemical class 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims 1
- 230000000694 effects Effects 0.000 description 4
- 230000005520 electrodynamics Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000003380 propellant Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
-
- 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
- H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
Definitions
- the present invention relates to a circuit breaker comprising at least one pair of separable contacts of which at least one is mobile, a control mechanism controlled by at minus an electromagnetic propellant, in the air gap of which is disposed a movable arm carrying the contact mobile, this arm being arranged to perform a function opening of said separable contacts in the event of a short circuit.
- Such a circuit breaker is known, for example, from the German patent N o 942 455.
- This patent discloses the principle of electrodynamic boosters which ensure good breaking of the circuit breakers, in particular high ratings which have only a small number of turns, sometimes even a single turn, thanks to a quick tilting of the movable contact arm.
- This tilting is due to the electrodynamic repulsion defined by Laplace's law applied to the contact arm traversed by a current and disposed between the poles of the magnetic circuit.
- this repulsion is greatly amplified thanks to the very strong field prevailing in the air gap of the magnetic circuit.
- the present invention proposes to overcome this disadvantage by making a circuit breaker in which prevents retrograde displacement of the root of the arch, whatever the origin of the decline.
- circuit breaker characterized in that said movable arm is equipped with a insulating or electrically weakly conductive cover, formed at the rear of said movable contact, that the contact fixed is arranged at one end of the air gap, and that the contact arm is pivotally mounted about an axis located opposite the fixed contact, the cover extending between the movable contact and said axis, and being made in a material having a high thermal resistance.
- the cover is consisting of a molded plastic part insulating, in particular in polyamide amide.
- this cache is consisting of a piece shaped from a material electrically weakly conductive, such as, for example, steel.
- the circuit breaker 10 shown schematically comprises an input terminal 11, a terminal 12 and a manual control lever 13, these elements being housed in a housing 14 provided with a base 15 which allows the mounting of this circuit breaker on suitable supports for an electrical panel. It comprises furthermore a fixed contact 16 and a movable contact 17 which is carried by a movable arm 18.
- a thermal release bimetal 20 is connected by a link 19 to the lever trigger 21 of the control mechanism 22 to hanging.
- the control mechanism 22 is linked to the arm mobile 18 for the opening of the contacts, ie continued manual intervention on lever 13, i.e. to a trigger caused by bimetallic strip 20, i.e. under the effect of an electrodynamic repulsion of the movable arm 18 in the event of a short circuit.
- FIG. 2 illustrates the thruster 24 with a circuit magnetic 25 intended to actuate the movable arm 18 by electrodynamic repulsion in the event of a short circuit.
- This magnetic circuit 25 comprises two pole pieces 30 and 31 defining an air gap 32 in which is housed the movable arm 18 which carries the movable contact 17, and a core 33 carrying one or more turns of a winding 34 traveled by the current.
- the very intense field which reigns in the air gap 32 exercises strong electromagnetic forces on the arm mobile 18 which pivots about its axis 35, which has for opening effect of the separable contacts 16, 17.
- arm 18 is fitted with a cover 40 (see figure 2) or 41 (see figure 3) which is arranged at the rear of the movable contact 17 on the movable arm 18.
- This cover can be made in the form of a part molded from a material insulating synthetic. It can also be done by machining or bending a part of a weak material conductor such as certain steels.
- the movable arm 18 can have different shapes and the cover 40 can be present in various variant embodiments which are adapted to the different shapes of the movable arm. It is by example the case of the achievements represented Figures 2 and 3 respectively.
- the root of the electric arc tends to move towards an area for which the arc path is more short. If we want to avoid such a displacement and maintain this root on the mobile contact it's essential to isolate neighboring areas whose distance to the fixed contact decreases when tilting the movable arm. This insulation is obtained thanks to the cover 40, 41 described above.
- the positioning of the contacts 16, 17 relative to the propellant 24 is such that the pad of the fixed contact 16 is arranged in the vicinity of the lower part of the air gap 32.
- the middle of the pad is located substantially in the frontal plane of the pole pieces 30, 31, half of the patch being inserted in the air gap 32, and the other half making protruding outwards.
- the width of the pad of the fixed contact 16 is less than the thickness of the air gap 32, and substantially equal to the sum of the width of the arm of contact 18 and the insulating cover 40.
- the width of the arm of contact 18 movable in the air gap 32 is thus reduced to minimum, which also reduces the size of the magnetic circuit 25.
- the thermal resistance of the insulating material used for the cover 40 must withstand temperatures above 350 °.
- a particularly advantageous insulating material is polyamide amide, usable in film form very slim.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
Description
Claims (7)
- Disjoncteur comprenant au moins une paire de contacts séparables (16, 17) dont au moins un (17) est mobile, un mécanisme (22) de commande piloté par au moins un propulseur (24) électromagnétique ayant un circuit magnétique (25), dans l'entrefer (32) duquel est disposé un bras mobile portant ledit contact mobile, ce bras étant agencé pour assurer une fonction d'ouverture desdits contacts séparables en cas de court-circuit,
caractérisé en ce que ledit bras mobile (18) est équipé d'un cache (40, 41) isolant ou électriquement faiblement conducteur, ménagé à l'arrière dudit contact mobile (17), que le contact fixe (16) est agencé à une extrémité de l'entrefer 32, et que le bras de contact (18) est monté à pivotement autour d'un axe (35) situé à l'opposé du contact fixe (16), le cache (40, 41) s'étendant entre le contact mobile (17) et ledit axe (35), et étant réalisé en un matériau ayant une résistance thermique élevée. - Disjoncteur selon la revendication 1, caractérisé en ce que ledit cache (40, 41) est constitué d'une pièce moulée en matière synthétique isolante.
- Disjoncteur selon la revendication 1, caractérisé en ce que ledit cache (40, 41) est constitué d'une pièce usinée en un matériau faiblement conducteur.
- Disjoncteur selon la revendication 3, caractérisé en ce que ladite pièce usinée est réalisée en acier.
- Disjoncteur selon l'une des revendications 1 à 4, caractérisé en ce que le milieu de la pastille formant le contact fixe 16 se trouve sensiblement dans le plan frontal des pièces polaires (30, 31), la moitié de la pastille étant insérée dans l'entrefer (32), et l'autre moitié faisant saillie vers l'extérieur.
- Disjoncteur selon la revendication 5, caractérisé en ce que la largeur de la pastille du contact fixe 16 est inférieure à l'épaisseur de l'entrefer 32, et sensiblement égale à la somme des épaisseurs du bras de contact 18 et du cache 40 isolant.
- Disjoncteur selon la revendication 2 ou 6, caractérisé en ce que le matériau isolant du cache 40 est à base de polyamide amide.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9308933A FR2708140B1 (fr) | 1993-07-19 | 1993-07-19 | Disjoncteur pourvu d'un mécanisme de commande à accrochage pilote par un propulseur électromagnétique. |
FR9308933 | 1993-07-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0635859A1 EP0635859A1 (fr) | 1995-01-25 |
EP0635859B1 true EP0635859B1 (fr) | 1998-12-23 |
Family
ID=9449445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940410048 Expired - Lifetime EP0635859B1 (fr) | 1993-07-19 | 1994-07-08 | Disjoncteur pourvu d'un mécanisme de commande à accrochage piloté par un propulseur électromagnétique |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0635859B1 (fr) |
DE (1) | DE69415426T2 (fr) |
FR (1) | FR2708140B1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5581063A (en) * | 1995-06-26 | 1996-12-03 | Square D Company | Arc-resistant shield for protecting a movable contact carrier of a circuit breaker |
FR2768856B1 (fr) * | 1997-09-24 | 1999-11-12 | Schneider Electric Sa | Disjoncteur a declencheur electromagnetique a propulseur d'un contact mobile a fourche |
CN102568964B (zh) * | 2012-03-08 | 2014-03-19 | 江苏辉能电气有限公司 | 一种塑壳断路器可动静触头的保护组件 |
CN104576246B (zh) * | 2014-12-31 | 2017-03-29 | 上海永继电气股份有限公司 | 小型断路器的动触头组件及其制造方法 |
CN104576247A (zh) * | 2015-01-05 | 2015-04-29 | 无锡新宏泰电器科技股份有限公司 | 一种防跌落单断点触头操作机构 |
CN108766845B (zh) * | 2018-08-20 | 2024-03-19 | 厦门大恒科技有限公司 | 一种液压电磁铁结构以及断路器 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE446282A (fr) * | 1941-07-12 | |||
DE942455C (de) * | 1941-07-12 | 1956-05-03 | Aeg | Elektrischer UEberstromselbstschalter fuer Wechselstrom |
US4546337A (en) * | 1983-09-02 | 1985-10-08 | Eaton Corporation | Residential circuit breaker with one piece slot motor |
US4791393A (en) * | 1983-12-19 | 1988-12-13 | Westinghouse Electric Corp. | Molded case circuit breaker with movable upper electrical contact positioned by torsion springs |
-
1993
- 1993-07-19 FR FR9308933A patent/FR2708140B1/fr not_active Expired - Fee Related
-
1994
- 1994-07-08 EP EP19940410048 patent/EP0635859B1/fr not_active Expired - Lifetime
- 1994-07-08 DE DE1994615426 patent/DE69415426T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69415426T2 (de) | 1999-06-10 |
FR2708140B1 (fr) | 1995-09-01 |
FR2708140A1 (fr) | 1995-01-27 |
EP0635859A1 (fr) | 1995-01-25 |
DE69415426D1 (de) | 1999-02-04 |
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Inventor name: DELCAMBRE, PHILIPPE, SCHNEIDER ELECTRIC SA Inventor name: AMBLARD, JEAN-YVES Inventor name: DOMEJAN, ERIC, SCHNEIDER ELECTRIC SA Inventor name: HANNEQUIN, PASCAL, SCHNEIDER ELECTRIC SA Inventor name: MENIER, ALAIN, SCHNEIDER ELECTRIC SA |
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