EP1084502A1 - Optimised magnetic subassembly - Google Patents
Optimised magnetic subassemblyInfo
- Publication number
- EP1084502A1 EP1084502A1 EP98930816A EP98930816A EP1084502A1 EP 1084502 A1 EP1084502 A1 EP 1084502A1 EP 98930816 A EP98930816 A EP 98930816A EP 98930816 A EP98930816 A EP 98930816A EP 1084502 A1 EP1084502 A1 EP 1084502A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- assembly
- circuit breaker
- cylinder head
- magnetic sub
- 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
Links
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
Definitions
- the present invention relates to a magnetic sub-assembly for modular electrical equipment of the circuit breaker type, as well as a circuit breaker incorporating such a sub-assembly.
- Line protection circuit breakers generally include, in a modular housing with plastic shells, a circuit extending between two terminals and comprising a thermal trip bimetal for protecting the line against overloads and, between a terminal and a contact fixed, an electromagnetic disjunction or magnetic trip device often grouped with these two components to form a magnetic sub-assembly.
- the magnetic trip device essentially comprises a coil with a movable core, associated with a striker to ensure, in the event of overcurrent, the tripping by opening of a movable contact cooperating with a fixed contact.
- the trigger more precisely comprises an induction coil mounted longitudinally in a magnetic yoke, and surrounding said movable core associated with the striker and with a fixed core, a return spring disposed between the cores completing the assembly.
- This spring allows in particular to recall the movable core in the rest position, striker in the inactive position, that is to say at a distance from the mechanical lock allowing the opening of the contacts by tilting of the movable contact.
- the cylinder head consists of a sheet of magnetic material generally surrounding the coil to properly channel the field lines produced, when the coil is traversed by a current.
- the yoke On either side of said coil, in an axial direction, the yoke has sides opposite one another, one of which is provided with the fixed core, and at which the others are generally disposed elements of the magnetic sub-assembly, that is to say one of the circuit breaker connection terminals and the fixed contact respectively.
- the magnetic sub-assemblies thus assembled in one piece are then placed in a part of the plastic shell of the box, when the circuit breaker is assembled.
- these magnetic sub-assemblies are essential elements of circuit breakers, and their design is therefore the subject of particular care, as well as numerous tests intended to test the validity of the recommended solutions.
- the main function being linked to the existence of sudden overcurrents, some of these tests are of course carried out in different short-circuit configurations, or at least with currents equal to several times the value of the nominal current, for which the performance of the magnetic sub-assembly is measured.
- one of the parameters which is particularly and particularly rigorously controlled is the pulling force of the contacts.
- the purpose of these controls, and the resulting adjustments, is to refine the conditions for triggering the mechanical lock by better control of the electromagnetic trigger and of the force carried by the striker.
- the heating of the different parts of the magnetic sub-assembly is also a sensitive parameter, for which tests at nominal current or slightly higher are carried out, with the aim of reducing it as much as possible.
- These are also the main objectives of the present invention, which aims overall to optimize the design of the magnetic sub-assemblies equipping the circuit breakers, in particular but not exclusively for the aforementioned purposes.
- this optimization must be carried out without changing the conditions of installation of said magnetic sub-assembly in the shells forming the case of the circuit breaker.
- the overall space allocated to it in the housing remains the same.
- the present invention therefore applies to a magnetic sub-assembly of a modular electrical apparatus of the circuit breaker type, composed on the one hand of an induction coil associated with a movable core with striker and return spring arranged in an insulating sheath , said coil being mounted longitudinally in a cylinder head having two sides opposite one another, the first side being provided with a fixed core in which the striker is guided, and on the other hand with a fixed contact to which is connected a first end of the coil and a connection terminal to the circuit breaker to which the second end of the coil is connected, characterized in that the side of the cylinder head disposed on the side of the end of the coil intended to be connected to the fixed contact is sized to be at least partially integrated into the interior volume of the coil in order to absorb possible axial dimensional variations thereof, the corresponding end of which is oriented so that its fixing to the fixed contact, whose position relative to the cylinder head is fixed, makes it possible to make up for the axial play of the coil .
- the coils can have an axial dimensional dispersion which can go up to more than 1 mm, while the cylinder head can be manufactured in a much more precise manner, due to its very nature, namely a sheet simply folded according to a particular geometry.
- the coil has also been the subject of modifications within the framework of the present invention, as will be seen in more detail below, but its minimum number of turns is imposed, in order to conserve the ampere-turns necessary for the force of removal of contacts.
- the section of the wire being particularly large in the sizes of circuit breakers to which the invention preferably applies (50-63 A), and this not being modifiable, dimensional dispersion during manufacture is almost inevitable.
- This cylinder head has two end flanks at which are fixed respectively a connection terminal and the fixed contact, which is in the form of a metal blade on which is brought a pad at the precise place of contact with the mobile contact.
- This fixed contact has, according to the invention, an extension for its axial fixing to the side of the cylinder head, consequently provided with an orifice for housing the end of the fixed core, and the periphery of which is finally also dimensioned so as to be able be partially integrated into the internal volume of the coil, near the end of the latter.
- the fixed pole core is therefore integrated on the one hand into a side of the cylinder head, and on the other hand into the fixed contact whose extension in question is coaxial with said side.
- This extension also subscribes to the same characteristics as this sidewall, and facilitates the mounting of all the coils from mass production.
- the end of the coil to be connected to the fixed contact is oriented in a direction substantially parallel to the axis of the coil, and fixed on a lug of the fixed contact located in the immediate vicinity of the contact pad fitted to said fixed contact. , said tab having for this purpose a surface with a shape parallel to said end. The orientation of said end allows the connection to be made in the same way regardless of the size of the coil, which represents a new significant advantage in terms of manufacturing.
- the section of the electric wire forming the induction coil has a rectangular appearance, with a radial thickness less than the axial width to increase on the one hand the internal volume enclosed by said coil and on the other hand reduce the length of wire necessary for the same length of spool.
- the rectangular section of the wire being retained, the axial width of the wire can be further increased if the thickness of the sheet forming the cylinder head is reduced, whose external volume remains unchanged, however.
- the magnetic sub-assembly with these improvements can however always be installed in the same hulls or portion of hulls as its predecessors.
- the cylinder head has a U shape, the arm connecting the two end blanks being on the same side of the coil as the fixed contact and the connection terminal.
- This shape makes it possible to achieve a volume of magnetic material constituting a good compromise between those which would lead to the best performance for very high short-circuit currents, and those which are more suitable for lower short-circuit currents.
- the U-shape correctly channels the magnetic field lines at lower test values (180 A, 300 A), which in particular makes it possible to use a spring of lower stiffness. It is however very efficient at saturation, and guarantees the aforementioned non-tripping limits for medium currents.
- the end of the arm connecting the sides of the cylinder head located on the side of the connection terminal has a lateral notch provided for fixing the second end of the coil to said terminal without there being any contact with the cylinder head.
- Said end is oriented in a plane perpendicular to the axis so as to exit tangentially from the winding forming said coil.
- the two ends of the coil are therefore substantially perpendicular to each other, and provided to facilitate their fixing respectively to the connection terminal and to the fixed contact, in combination with the particular shape of the cylinder head and of these elements.
- the end of the coil on the terminal side is fixed to a lug extending the upper part of the connection terminal, having a surface with a shape perpendicular to the axis of the coil, the fixing being carried out at said notch.
- This configuration makes it possible to make up a play perpendicular to the longitudinal median plane of the circuit breaker case, if necessary.
- the end of the coil is oriented axially so as to leave the cylinder head at the level of said notch, the attachment to the connection terminal being made outside the volume surrounded by the cylinder head.
- the cylinder head is also provided in a material which depends in particular on the choice of the spring.
- it is made of copper or steel, the return spring of the core being for example provided with a weaker force in the first case.
- the core is preferably made of steel, a more magnetic material than brass generally used hitherto for high nominal intensities, and which contributes to improving the control of the contact separation force.
- the invention also relates to a circuit breaker characterized in that it comprises a magnetic sub-assembly as described above.
- FIG. 1 is an exploded perspective view of the various components of the magnetic sub-assembly according to the invention
- - Figures 2 and 3 show perspectives of assembled sub-assembly seen from different angles
- FIG. 4 is a front elevational view of said sub-assembly.
- FIG. 5 shows an enlarged detail of the sidewall allowing the coil to overflow.
- the central elements of the magnetic sub-assembly are the coil (1) and the magnetic yoke (2), inside which the movable core (3), the fixed core (4), the striker (5) and return spring (6), the latter elements being arranged inside an insulating sheath (7).
- the cylinder head (2) itself has end flanks (8, 9), connected by an axial arm (10) provided with a recess (1 1) in the vicinity of the flank (9), at the level of which takes place the right end (12) of the coil (1).
- This is of tangential shape to said coil (1), and substantially perpendicular to the other straight end (13), which develops rather in an axial direction.
- the sidewall (8) has a shape such that its insertion is possible inside the volume of the coil (1), as will be shown in more detail below.
- the fixed contact (15) further comprises a tab (17) providing an external surface with a shape parallel to the longitudinal axis of the magnetic sub-assembly, on which the right end (13) of the coil (1) is fixed. .
- connection terminal (18) which is extended by a lug (19) having a surface with a shape perpendicular to said longitudinal axis, on which the other straight end is fixed ( 12) of the coil (1), at the level of the recess or the notch (1 1).
- This terminal (18) has a removable wall (20).
- FIG. 2 is more precise as for the coil (1) / fixed contact (15) link, while FIG. 3 is clearer for the description of the coil (1) / connection terminal (18) link.
- This fixing zone is very close to the actual electrical contact, which occurs at the level of the pad (16), in particular due to the offset of the fixed contact (15) relative to the longitudinal axis of the magnetic sub-assembly, in l 'occurrence materialized by the striker (5) guided by the fixed core (4).
- a contact configuration between the straight end (12) and the tab (19) is formed in a plane substantially perpendicular to the previous one.
- the fixing takes place in the notch (1 1) made in the arm (10) connecting the sides (8, 9) of the cylinder head (2).
- the coil (1) comprises approximately three turns of substantially rectangular section, which makes it possible to gain internal volume, to reduce the length of wire necessary for its production, and consequently to reduce heating while increasing the polar surfaces of the cores, and therefore the separation force of the contacts.
- the sheet metal of the cylinder head (2), and particularly the arm (10), has undergone a reduction in thickness, to allow the increase in the external volume, and consequently of the internal cylindrical orifice of the coil (1).
- connection terminal (18) has itself undergone an increase in thickness on the current path, that is to say in the upper part, in order to reduce heating in this portion of the magnetic sub-assembly.
- FIG. 5 is essentially to represent the magnetic sub-assembly of the invention when a coil (1) which is too long is installed there. In this case, only the rounded areas located in the vicinity of the right end (13) of the coil (1) must be configured so as not to hinder the expansion of the coil (1).
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
- Electromagnets (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Thin Magnetic Films (AREA)
- Soft Magnetic Materials (AREA)
- Magnetic Heads (AREA)
- Coils Or Transformers For Communication (AREA)
- Hard Magnetic Materials (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9807134 | 1998-06-03 | ||
FR9807134A FR2779567B1 (en) | 1998-06-03 | 1998-06-03 | OPTIMIZED MAGNETIC SUB-ASSEMBLY |
PCT/FR1998/001197 WO1999063564A1 (en) | 1998-06-03 | 1998-06-10 | Optimised magnetic subassembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1084502A1 true EP1084502A1 (en) | 2001-03-21 |
EP1084502B1 EP1084502B1 (en) | 2001-10-31 |
Family
ID=9527093
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98930816A Expired - Lifetime EP1084502B1 (en) | 1998-06-03 | 1998-06-10 | Optimised magnetic subassembly |
Country Status (8)
Country | Link |
---|---|
US (1) | US6577217B1 (en) |
EP (1) | EP1084502B1 (en) |
AT (1) | ATE208084T1 (en) |
AU (1) | AU8112098A (en) |
DE (1) | DE69802309T2 (en) |
ES (1) | ES2167086T3 (en) |
FR (1) | FR2779567B1 (en) |
WO (1) | WO1999063564A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2812965B1 (en) * | 2000-08-10 | 2002-10-11 | Schneider Electric Ind Sa | ELECTROMAGNETIC ACTUATOR FOR PROTECTIVE SWITCHING APPARATUS |
DE10324390A1 (en) * | 2003-05-30 | 2004-12-23 | Abb Patent Gmbh | Electrical release device for an electric switch, fits in a casing with moving and fixed contacts, a switch latch, an electromagnetic tripping device with an armature, a core, a coil and a yoke |
FR2858106B1 (en) * | 2003-07-22 | 2005-09-23 | Hager Electro | IMPROVED MAGNETIC SUBASSEMBLY AND CIRCUIT BREAKER HAVING SUCH A MAGNETIC SUBASSEMBLY |
TWI300575B (en) * | 2003-11-18 | 2008-09-01 | Via Tech Inc | Coplanar transformer |
FR2868596B1 (en) * | 2004-04-01 | 2006-05-26 | Schneider Electric Ind Sas | MAGNETIC SUBASSEMBLY OF AN ELECTRICAL DEVICE SWITCH |
AT509278A1 (en) * | 2008-03-20 | 2011-07-15 | Moeller Gebaeudeautomation Gmbh | TRIP MODULE FOR A SWITCHGEAR |
JP5276523B2 (en) * | 2009-06-08 | 2013-08-28 | 三菱電機株式会社 | Circuit breaker |
DE102009033275B4 (en) * | 2009-07-09 | 2011-05-19 | Siemens Aktiengesellschaft | breakers |
FR2962255B1 (en) * | 2010-07-02 | 2012-07-13 | Schneider Electric Ind Sas | ELECTROMAGNETIC TRIGGER FOR ELECTRICAL DEVICE SWITCH, ELECTRICAL DEVICE SWITCH COMPRISING SUCH A TRIGGER. |
DE102011014061B4 (en) * | 2011-03-16 | 2013-11-28 | Abb Ag | Circuit breaker and method of making a circuit breaker |
EP2544207B1 (en) | 2011-07-05 | 2017-03-29 | Siemens Aktiengesellschaft | Short circuit trigger with optimised coil connection |
FR2989512B1 (en) * | 2012-04-17 | 2014-04-25 | Schneider Electric Ind Sas | CONTROL UNIT FOR CUTTING A LINE IN CASE OF OVERCURRENT IN THIS LINE AND CIRCUIT BREAKER AGAINST OVERCURRENT IN A LINE |
CN106783430A (en) * | 2016-11-29 | 2017-05-31 | 贵州新纳电器有限公司 | A kind of oil damper fixed structure of oil damping breaker |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH670170A5 (en) * | 1986-04-07 | 1989-05-12 | Sprecher & Schuh Ag | |
FR2629633A1 (en) * | 1988-03-30 | 1989-10-06 | Hager Electro | MAGNETIC TRIGGER FOR CIRCUIT BREAKER |
JPH02299120A (en) * | 1989-05-15 | 1990-12-11 | Matsushita Electric Works Ltd | Wiring breaker |
FR2676860B1 (en) * | 1991-05-21 | 1994-06-17 | Merlin Gerin | ELECTROMAGNETIC TRIGGER FOR A LOW CALIBER ELECTRIC CIRCUIT BREAKER. |
EP0569652A1 (en) * | 1992-05-13 | 1993-11-18 | Hager Electro S.A. | Magnetic trip mechanism for circuit breaker, equivalent sub-assembly and circuit breakers incorporating them |
DE4445169C2 (en) * | 1994-12-17 | 1998-09-10 | Abb Patent Gmbh | Submersible magnet system |
FR2753836B1 (en) * | 1996-09-23 | 1998-10-30 | ELECTROMAGNETIC TRIGGER FOR ELECTRIC PROTECTIVE APPARATUS |
-
1998
- 1998-06-03 FR FR9807134A patent/FR2779567B1/en not_active Expired - Fee Related
- 1998-06-10 ES ES98930816T patent/ES2167086T3/en not_active Expired - Lifetime
- 1998-06-10 AU AU81120/98A patent/AU8112098A/en not_active Abandoned
- 1998-06-10 AT AT98930816T patent/ATE208084T1/en not_active IP Right Cessation
- 1998-06-10 WO PCT/FR1998/001197 patent/WO1999063564A1/en active IP Right Grant
- 1998-06-10 US US09/701,925 patent/US6577217B1/en not_active Expired - Lifetime
- 1998-06-10 EP EP98930816A patent/EP1084502B1/en not_active Expired - Lifetime
- 1998-06-10 DE DE69802309T patent/DE69802309T2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9963564A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2779567B1 (en) | 2000-07-13 |
DE69802309T2 (en) | 2002-07-25 |
WO1999063564A1 (en) | 1999-12-09 |
AU8112098A (en) | 1999-12-20 |
ATE208084T1 (en) | 2001-11-15 |
US6577217B1 (en) | 2003-06-10 |
ES2167086T3 (en) | 2002-05-01 |
EP1084502B1 (en) | 2001-10-31 |
FR2779567A1 (en) | 1999-12-10 |
DE69802309D1 (en) | 2001-12-06 |
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