EP2261944B1 - Circuit breaker - Google Patents

Circuit breaker Download PDF

Info

Publication number
EP2261944B1
EP2261944B1 EP09175002.6A EP09175002A EP2261944B1 EP 2261944 B1 EP2261944 B1 EP 2261944B1 EP 09175002 A EP09175002 A EP 09175002A EP 2261944 B1 EP2261944 B1 EP 2261944B1
Authority
EP
European Patent Office
Prior art keywords
stator
coil
current
circuit breaker
vector component
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.)
Not-in-force
Application number
EP09175002.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2261944A3 (en
EP2261944A2 (en
Inventor
Takeshi Kurosaki
Hideo Shida
Takashi Iizuka
Yo Makita
Shinji Monden
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2261944A2 publication Critical patent/EP2261944A2/en
Publication of EP2261944A3 publication Critical patent/EP2261944A3/en
Application granted granted Critical
Publication of EP2261944B1 publication Critical patent/EP2261944B1/en
Not-in-force 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

Definitions

  • the present invention relates to a circuit breaker and, more specifically, to an electromagnetic device for instantaneous trip use in the circuit breaker.
  • electromagnetic device for instantaneous trip use (hereinafter, simply referred to as electromagnetic device) in a circuit breaker described in Patent Document 1 ( JP-A-8-306295 ).
  • electromagnetic device including a plurality types of electromagnetic coils, design twists are added to how to wind a coil and in what shape a core is for winding of the coil, for example, to reduce the size of the electromagnetic device and to enable manufacturing using an automatic coil winder.
  • Document FR 2 776 567 discloses an electromagnetic sub-assembly for circuit-breakers according to the preamble of claim 1.
  • the number of winding turns of a coil is limited depending on the spatial capacity for placement of the electromagnetic device, and the cross-sectional area of a conductor.
  • the device design of a high rated current requires a thick conductor, and when such a device design is with a low instantaneous-trip current value, the spatial capacity is limited for placement of the device, thereby failing to increase the number of winding turns of the coil.
  • the invention is proposed to solve the problems described above, and an object thereof is to provide a small-sized high-performance circuit breaker including an electromagnetic device that can, by a shape change of a component originally provided therein, increase a rated current value within any existing limited space, and generate a trip force equal in value to the previous with a low instantaneous trip current value.
  • a trip device including an electromagnetic device for instantaneous trip use, and an open-close contact section
  • the electromagnetic device for instantaneous trip use is configured to include: a coil; an insulation pipe provided inside of the coil, a fixed core provided at one end in the insulation pipe, a movable core that is inserted into the insulation pipe, and moves in the insulation pipe by a magnetic flux generated by the coil to operate the trip device; a spring provided between the movable core and the fixed core for biasing the movable core, a yoke whose one end is located at the outside end portion of the fixed core, and the other end is located on the side of the movable core; and a stator having a stator contact coming close to and moving away from a contact of a movable element, and being a conductive plate jointed to an end of the coil, engaging the fixed core, and fixed to the yoke.
  • the stator forms a current path between the stator contact and the joint section with the
  • a magnetic flux to be generated by circulation of a current in a stator is added to a magnetic flux to be generated by a coil.
  • Such effects can increase the actual specification range, e.g., the instantaneous-trip current value can be set lower than the previous value.
  • the electromagnetic force will be large with an allowance, the number of winding turns of the coil can be favorably reduced so that the resulting circuit breaker can include the electromagnetic device reduced in size as such.
  • FIG. 1 is an external perspective view of a three-phase circuit breaker (hereinafter, simply referred to as circuit breaker) of the first embodiment of the invention.
  • FIG. 2 is a perspective view of components, i.e., an open-close mechanism section, a trip device, and a base chassis, with a cover removed from the circuit breaker.
  • a circuit breaker 100 is configured to include an open-close mechanism section 200, a trip device 300, an open-close contact section (not shown), and a circuit interrupter (not shown).
  • the circuit interrupter is housed in a base chassis 40, which is configured by substrates 101 and intermediate substrates 102.
  • the substrates 101 and 102 are all made of an insulation material.
  • the remaining components, i.e., the open-close mechanism section 200, the trip device 300, and the open-close contact section are fixed to and held by the intermediate substrates 102.
  • a cover 111 made of an insulation material is detachably attached to the base chassis 40.
  • FIG. 3 is a perspective view of the components, i.e., the open-close mechanism section 200 and the trip device 300, when the circuit breaker 100 is in the ON state.
  • FIG. 4 is a perspective view of the components, i.e., the open-close mechanism section 200 and the trip device 300, when the circuit breaker 100 is in the trip state.
  • a load circuit being a three-phase electric circuit connected with the circuit breaker 100 is provided with a load current of a predetermined value or higher, i.e., an overload current for a predetermined length of time or longer.
  • a bimetal 50 configuring time-limit trip means in the trip device 300 changes in shape by bending by a predetermined amount in the right side of the drawing. Such a shape change accordingly operates a trip bar 60 of the open-close mechanism section 200, and a latch 70 coming in contact with the trip bar 60 is thus rotated, thereby tripping the open-close mechanism section 200.
  • three movable-element contacts 9 having been in contact with three stator contacts 6 of the open-close contact section are opened away from one another.
  • the three stator contacts 6 are those respectively connected to R, S, and T three-phase conductors (not shown) of the load circuit.
  • FIG. 5 is an exploded side view of the electromagnetic device for use in the circuit breaker of the first embodiment of the invention.
  • This electromagnetic device is configured by components including an insulation pipe 1, the movable core 2, a spring 3, the coil 4, a stator 5, the stator contacts 6, a yoke 7, and a fixed core 8.
  • the coil 4 consists of winding turns of a conductor of the rectangular cross section.
  • the stator 5 being the characteristic part of the invention is connected to an end of the coil 4.
  • the stator 5 is configured by a conductive plate having the flat plane substantially in the shape of a question mark, i.e., the shape of connecting a ring-shaped portion 5a and a linear portion 5b.
  • the ring-shaped portion 5a is partially cut, i.e., has a cut portion 5c, and is hereinafter simply referred to as ring-shaped portion 5a.
  • the expression of "in the shape of a question mark” means that a current path is in the shape of a question mark.
  • the ring-shape portion 5a may be in the shape of a complete ring, i.e., without the cut portion 5c, with the cut portion 5c filled with an insulation material, for example.
  • the linear portion 5b of the stator 5 is provided with the stator contacts 6.
  • a reference numeral 11 denotes a current path for a current flow circulating from the stator contacts 6 of the stator 5 along the ring-shaped portion 5a.
  • FIGS. 7A to 7C are each a diagram showing the connection state between the stator 5 and the coil 4.
  • FIG. 7A is a front view
  • FIG. 7B is a side view
  • FIG. 7C is a perspective view.
  • an end portion adjacent to the cut portion 5c is electrically and mechanically jointed by welding firmly to an end of the coil 4.
  • This jointed section 14 is located on the plane facing the direction opposite to the stator contacts 6, thereby easing the assembly.
  • the current path 11 is so formed that the ring-shaped portion 5a is coaxial with the coil 4, and the flow of a current is directed in the same direction as for the coil 4.
  • FIGS. 8A to 8C are each a diagram showing the state in which the fixed core 8 or others are combined with the yoke 7. Specifically, FIG. 8A is a front view, FIG. 8B is a side view, and FIG. 8C is a perspective view.
  • the yoke 7 supporting the fixed core or others is made of a magnetic material, and is in the substantially lateral U shape when viewed from the side. An end of the yoke 7 is formed with an aperture, and the yoke 7 is so disposed that the center of this aperture comes at the axial core of the coil 4.
  • the ring-shaped portion 5a of the stator 5 is disposed on the aperture portion of the yoke 7, and the fixed core 8 is swaged at one end thereof in the internal space of the ring-shaped portion 5a, thereby firmly fixing together the fixed core 8, the stator 5, and the yoke 7.
  • the fixed core 8 protrudes from an end of the yoke 7 toward the inside of the coil 4.
  • FIGS. 9A and 9B are each a diagram showing the state in which the insulation pipe 1, the movable core 2 or others are combined with the coil 4, the yoke 7, and others.
  • FIG. 9A is a side view
  • FIG. 9B is a perspective view.
  • the insulation pipe 1 has an end being an open end 1a, and the remaining end thereof is an aperture with a diameter smaller than that of the open end 1a.
  • the insulation pipe 1 is inserted therein with the movable core 2 that can move along the axis of the pipe, and the spring 3 for biasing the movable core 2 ( FIGS. 9A and 9B do not show the spring 3).
  • An end of the movable core 2 is protruding from the small-diameter aperture of the insulation pipe 1, and the small-diameter section restricts the movable core 2 not to fall off from the insulation pipe 1.
  • the insulation pipe 1 is inserted into the coil 4.
  • the other end of the yoke 7 is formed with a section for insertion of the insulation pipe 1.
  • the insulation pipe 1 is inserted into the coil 4 in the direction of an arrow of FIGS. 9A and 9B in such a manner that the side of the open end 1a is opposed to the fixed core 8.
  • the insulation pipe 1 is positioned in the diameter direction by the open end 1a snapping to the fixed core 8.
  • the other end of the insulation pipe 1 is fixed by hooking a nail portion 1b provided to the insulation pipe 1 to the yoke 7.
  • the components 1 to 8 are assembled together as such, and the electromagnetic device of FIGS. 10A and 10B is completed.
  • FIG. 10A is a side view of the electromagnetic device
  • FIG. 10B is a perspective view thereof.
  • FIG. 11 is a diagram showing the positional relationship between the stator 5 of the electromagnetic device, and a movable element 16 of the open-close mechanism section 200.
  • the movable element 16 is provided to rotate about a rotation axis 16a in such a manner that the movable-element contacts 9 move close to and away from the stator contacts 6.
  • a reference numeral 17 denotes a path for a current flowing to the movable element 16.
  • the coil 4 and the stator 5 are being electrically connected by the jointed section 14.
  • the flow of a current is directed from the movable element 16 along the current path 17 of the movable element 16, and then from the movable-element contacts 9 to the stator contacts 6, is directed to go through the ring-shaped portion 5a along the current path 11 of the stator 5, thereby reaching the coil 4 through the jointed section 14.
  • a magnetic flux to be generated along the axis of the coil 4 is a combination of a one-turn magnetic flux to be generated by the current circulating in the ring-shaped portion 5a of the stator 5, and a magnetic flux to be generated by the current flowing to the coil 4.
  • the magnetic flux being a combination result of the two magnetic fluxes as such passes through the movable core 2 in the insulation pipe 1, and the movable core 2 is thus electromagnetically pulled.
  • the movable core 2 is on standby at the position slightly protruding from the insulation pipe 1 by being biased by the spring 3, and when the movable core 2 is located at this position, only a part of the magnetic flux to be generated by the stator 5 and the coil 4 passes therethrough.
  • the electromagnetic force to be acted on the movable core 2 to pull it into the coil 4 is increased as the amount of displacement of the movable core 2 is increased.
  • the resulting stator 5 can serve as a current path for the circulation current for generating a magnetic flux. This accordingly enables to increase the electromagnetic force to a further degree without increasing the number of winding turns of a coil of the electromagnetic device.
  • the electromagnetic device can be reduced in size because the number of winding turns of a coil can be reduced.
  • the cut portion 5c may be filled with an insulation material, for example. If this is the configuration, the resulting stator 5 can be increased in mechanical strength.
  • FIGS. 12A to 12D each show a stator 500 of an electromagnetic device of a circuit breaker in a second embodiment of the invention.
  • FIG. 12A is a front view
  • FIG. 12B is a side view
  • FIG. 13C is a plan view
  • FIG. 12D is a perspective view.
  • a movable element and a stator are so disposed as to oppose each other as shown in FIG. 11 .
  • Such a configuration is aimed to increase the force of moving away the movable-element contacts 9 and the stator contacts 6 from one another when a large amount of current flows from the movable element to the stator using the repulsion between the movable element and the stator by the current respectively flowing thereinto.
  • FIGS. 13 to 15 are each a diagram for illustrating the operation principles of repulsion.
  • the portion showing the vector component A (downward arrow of FIG. 13 ) of a current flowing along the current path 17 of the movable element 16 is opposite in direction of current flow to the portion showing a backward vector component B (upward arrow of FIG. 14 ) of a current flowing through the stator 5, and thus the repulsion occurs therebetween.
  • the space between the movable element 16 and the stator 5 is reduced.
  • the portion showing the vector component A of a current flowing to the movable element 16 is the same in direction of current flow as the portion showing the vector component C (downward arrow of FIG.
  • the stator is so configured as shown in FIG. 12 .
  • the stator 500 is so bent as to generate a height difference S to a ring-shape portion 500a on the center line of a linear portion 500b.
  • R1 and R2 each denote a distance between the plane of the stator 500 and the movable element 16, i.e., the space R1 is for the portion showing the backward vector component B of a current, and the space R2 is for the portion showing the vector component C of a current.
  • the height difference S is so provided at the center of the ring-shape portion 500a of the stator 500 as to establish R1 ⁇ R2.
  • the remaining configuration is the same as that of the first embodiment.
  • the shape of a stator is so changed that the portions opposing each other are disposed close to each other when the vector component of a current flowing to the movable element is opposite in direction to the vector component of a current circulating in the stator, and such opposing portions are disposed away from each other when the vector component of the current flowing to the movable element is the same in direction as the vector component of the current circulating in the stator.
  • a shape change favorably brings the effects that the electromagnetic repulsion increases the trip operation force of the movable element.
  • the electromagnetic repulsion here is proportional to the square of the value of a current induced between the movable element and the stator, and is inversely proportional to the distance therebetween. Such effects are additionally provided to the effects achieved in the first embodiment.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
EP09175002.6A 2009-06-08 2009-11-04 Circuit breaker Not-in-force EP2261944B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009137079A JP5276523B2 (ja) 2009-06-08 2009-06-08 回路遮断器

Publications (3)

Publication Number Publication Date
EP2261944A2 EP2261944A2 (en) 2010-12-15
EP2261944A3 EP2261944A3 (en) 2013-10-23
EP2261944B1 true EP2261944B1 (en) 2015-09-09

Family

ID=42470656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09175002.6A Not-in-force EP2261944B1 (en) 2009-06-08 2009-11-04 Circuit breaker

Country Status (3)

Country Link
EP (1) EP2261944B1 (ja)
JP (1) JP5276523B2 (ja)
CN (1) CN101908447B (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102709130B (zh) * 2012-05-16 2014-12-03 上海良信电器股份有限公司 小型断路器的一体化热磁系统支架及其制作方法
CN103594298B (zh) * 2013-11-22 2016-04-06 王克诚 电控塑壳断路器及逻辑互锁式塑壳断路器
CN104319200B (zh) * 2014-10-15 2016-10-05 温州艾科电器科技有限公司 双动作电磁脱扣器
CN105810516B (zh) * 2014-12-29 2018-06-01 上海良信电器股份有限公司 一种断路器分合闸操作装置
CN104505315B (zh) * 2014-12-31 2016-06-29 靖江市海源有色金属材料有限公司 脱扣执行机构
CN105070612A (zh) * 2015-08-05 2015-11-18 浙江凯发电气股份有限公司 一种分励功能电磁脱扣器
CN105185670B (zh) * 2015-09-30 2018-09-11 上海电科电器科技有限公司 电磁脱扣装置
CN105448610A (zh) * 2015-12-10 2016-03-30 宋和明 脱扣执行装置
CN113299527B (zh) * 2021-07-26 2021-11-12 广东电网有限责任公司东莞供电局 一种永磁体可移动式中低压断路器驱动装置及方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641328Y2 (ja) * 1985-09-06 1994-10-26 三菱電機株式会社 回路遮断器
IE71036B1 (en) * 1990-02-23 1997-01-15 Square D Co A circuit breaker
JPH08306295A (ja) 1995-04-28 1996-11-22 Mitsubishi Electric Corp 回路遮断器の引外し用電磁石装置
FR2772980B1 (fr) * 1997-12-19 2000-01-21 Schneider Electric Sa Dispositif de declenchement magneto-thermique et disjoncteur equipe de ce dispositif
FR2779567B1 (fr) * 1998-06-03 2000-07-13 Hager Electro Sous-ensemble magnetique optimise
DE19845476B4 (de) * 1998-10-02 2004-08-12 Aeg Niederspannungstechnik Gmbh & Co Kg Magnetsystem für Leitungsschutzschalter
DE10058874A1 (de) * 2000-11-27 2002-03-21 Siemens Ag Spule mit mäanderförmigem Leiter
JP4090850B2 (ja) * 2002-11-13 2008-05-28 三菱電機株式会社 回路遮断器
CN101145475B (zh) * 2006-09-12 2011-09-07 Ls产电株式会社 模制盒式断路器的瞬间跳闸机构
JP4967602B2 (ja) * 2006-10-31 2012-07-04 富士電機機器制御株式会社 漏電遮断器の漏電引外し装置

Also Published As

Publication number Publication date
JP5276523B2 (ja) 2013-08-28
CN101908447A (zh) 2010-12-08
CN101908447B (zh) 2013-09-18
EP2261944A3 (en) 2013-10-23
JP2010282919A (ja) 2010-12-16
EP2261944A2 (en) 2010-12-15

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