EP2261946B1 - Short circuit detection apparatus for circuit breaker - Google Patents
Short circuit detection apparatus for circuit breaker Download PDFInfo
- Publication number
- EP2261946B1 EP2261946B1 EP08739880.6A EP08739880A EP2261946B1 EP 2261946 B1 EP2261946 B1 EP 2261946B1 EP 08739880 A EP08739880 A EP 08739880A EP 2261946 B1 EP2261946 B1 EP 2261946B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- armature
- stator
- short circuit
- circuit current
- detection device
- 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
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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
- H01H71/2472—Electromagnetic mechanisms with rotatable 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
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
- H01H71/405—Combined electrothermal and electromagnetic mechanisms in which a bimetal forms the inductor for the electromagnetic mechanism
Definitions
- the present invention relates to a short circuit current detection device for a circuit breaker which, when there is a short circuit of a circuit in which a large short circuit current flows, activates a trip device, causing a main circuit contact to open.
- a short circuit current detection device which, in the event of short circuit trouble occurring in the main circuit, detects the short circuit current, and momentarily breaks the circuit.
- the short circuit current detection device is basically based on the following kind of operating principle.
- Patent Document 2 Japanese Unexamined Patent Application Publication JP-A-2000-231 870
- Patent Document 2 Japanese Unexamined Patent Application Publication JP-A-10-283 899 DE-A-102006005697 discloses a short circuit current detection device for a circuit breaker according to the preamble of claim 1.
- the invention being contrived in order to solve the heretofore described kinds of problem, has an object of obtaining a circuit breaker short circuit current detection device which is of an armature support structure wherein no loss occurs in a magnetic flux across a support portion when there is a short circuit current energization, and can reduce the fluctuation in the size of a gap between a stator and an armature, without increasing the components at all.
- a circuit breaker short circuit current detection device comprises a conductor fixed in a case, a stator attached integrated with the conductor, and an armature, disposed facing the stator across the conductor, which turns based on a short circuit current flowing through the conductor, wherein the armature includes a movable portion facing the stator, at least one pair of arm portions extending from the movable portion, and an operating portion which activates a trip bar, and wherein the stator includes an armature support portion, extending to the armature side from one end portion of the stator, which engages with and fulcrum supports the arm portions of the armature.
- the structure is such that it is possible to support the armature directly with the stator without adding a non-magnetic part in order to support the armature, it is possible to reduce the number of parts configuring the device, and possible to downsize and reduce the price.
- FIG. 1 is a perspective view showing a short circuit current detection device 1 according to an Embodiment 1 of the invention
- FIG. 2 shows a condition wherein an armature 6 and a return spring 7 are removed from the short circuit current detection device 1 of FIG. 1 .
- Component 2 in the drawings being a heater configured of a conductor, is configured of a bottom portion 2a to be attached to a case, to be described hereafter, an upright portion 2b bent substantially perpendicularly from the bottom portion, and a lead-out portion 2c further bent approximately 90 degrees in a reverse direction, and is connected to an external conductor by a lead-out terminal 8.
- Component 3 is a bimetal, and is fixed to the upright portion 2b of the heater 2 with a pin 5, as in FIG. 2 .
- Component 4 is a stator, and is fixed with the pin 5 on the side of the heater 2 opposite to that of the mounting surface of the bimetal 3, integrated with the bimetal 3.
- Component 6 being the armature, it is disposed on the side of the upright portion 2b of the heater 2 opposite to that of the stator 4, and is turnably supported at its fulcrum by an armature support portion 4a of the stator 4. 7 is the return spring.
- FIG. 3 being perspective views showing a detailed structure of the stator 4
- FIG. 3B is a perspective view wherein FIG. 3A is seen from the opposite side.
- the stator 4 being made of, for example, a ferromagnetic substance such as iron, it is disposed facing the armature 6, to be described hereafter, across the heater 2, as previously described.
- the stator 4 has the armature support portion 4a, extended from one end portion of the stator 4, reaching a position facing the stator 4 across the heater 2, and forming a substantial U-shape in combination with the main body of the stator when seen from the top of the drawing.
- the armature support portion 4a is extended from the right side of the stator 4 facing the drawing, but it may also be extended from the left side.
- the armature support portion 4a includes, at either end thereof, support portions 4b and 4c which engage with arm portions 6b and 6c of the armature 6, to be described hereafter, and includes a latch portion 4d to which the lower end of the return spring 7 is attached.
- FIG. 4 is a perspective view showing a detailed structure of the armature 6.
- the armature 6 is configured of a movable portion 6a, which has a surface facing the stator 4, the pair of arm portions 6b and 6c extending in the upper portion of the movable portion 6a, one portion of each of which is bent in an inward direction forming a sideways U shape, and an operating portion 6d extending upward from one of the arm portions (6c in the drawing).
- Engagement portions 6e and 6f to be supported at the fulcrums by the heretofore described support portions 4b and 4c of the armature support portion 4a of the stator 4, are formed in the pair of arm portions 6b and 6c.
- the movable portion 6a includes bent portions 6g bent inwardly in such a way that the two end portions face each other, and cutaway portions 6h such that the armature 6 realizes fulcrum support with the stator 4 in a turnable condition.
- the armature 6 is disposed in a condition facing the stator 4 across the heater 2, which is a current path, and is turnably supported by the armature support portions 4b and 4c of the stator at the engagement portions 6e and 6f provided in the pair of arm portions 6b and 6c provided at both left and right ends.
- one end (the upper end) of the return spring 7 is attached to a latch portion 6i of the operating portion 6d of the armature 6, the other end (the lower end) is attached to the latch portion 4d of the stator 4, as heretofore described, and the operating portion 6d is urged in a direction away from a trip bar of a circuit breaker, to be described hereafter, by the contractile force of the return spring 7.
- FIG. 5 shows a sectional view of the short circuit current detection device of the Embodiment 1 incorporated into a circuit breaker.
- the short circuit current detection device is integrated with an overcurrent detection device utilizing the curvature of the bimetal 3. Next, a description will be given of an operation of the short circuit current detection device and overcurrent detection device.
- the device 1 is the heretofore described short circuit current detection device
- 11 is the trip bar
- 12 is a power source side terminal
- 13 is a fixed contact
- 14 is a movable contact
- 15 is a movable contact holder
- 16 is an operating handle
- 17 is a trip mechanism portion.
- the drawing shows a condition wherein the circuit breaker is activated by operating the operating handle 16.
- a main circuit current flows along a path from the power source side terminal 12, through the fixed contact 13, movable contact 14, movable contact holder 15, and heater 2, to a load side terminal 8.
- the heater 2 when an overcurrent exceeding the rated current flows, the heater 2 generates heat at the Joule heat caused by current energization, and the temperature of the bimetal 3 rises.
- the temperature of the bimetal 3 rises, its leading edge curves in the direction of the trip bar 11.
- the amount of heat generated increases, the temperature rises further, and the amount of curvature increases.
- the armature support portion 4a extending to the armature side from one end portion of the stator, which engages with and fulcrum supports the arm portions 6b and 6c of the armature, that is, by forming the support portion of the armature 6 in a cantilever shape integrated with the stator 4, the current path of the heater 2 or bimetal 3 does not pass through the inside of a magnetic loop formed by the stator 4 and armature 6 via the support portion.
- FIG. 6 being a side view showing a short circuit current detection device 1 according to an Embodiment 2 of the invention, shows a structural example wherein the heater is omitted by making the bimetal itself an energizing path.
- 9 is a flexible conductor of which one end is joined to the leading edge portion of the bimetal 3 and the other end is joined to the load side terminal 8
- 10 is a connecting conductor connected to the armature holder 15 of FIG. 5 .
- caulking using rivets or the like, or a welding or brazing method is used.
- Embodiment 2 differing from the Embodiment 1 only in that the heater 2 is omitted, the basic configuration of the short circuit current detection device 1 is the same. Consequently, in this case, the bimetal 3 itself is the energizing path, and the overcurrent detection operation is carried out by the bimetal temperature rising, and the bimetal curving, due to the resistance heat generation of the bimetal 3 itself.
- the stator 4 and armature 6 are magnetized, and a mutual attractive force is exerted.
- a large current such that exceeds ten times the rating flows when there is a short circuit, a large attractive force is exerted, and the armature 6 is pulled toward the stator 4 against the return spring 7.
- stator 4 and armature 6 are disposed facing each other across an energizing path including the connecting conductor 10, as heretofore described, a magnetic field caused by the current is formed in the periphery of the conductor 10.
- a case of disposing the armature 6 on the trip mechanism portion 17 side of the energizing path, and a case of disposing the stator 4 there, are conceivable.
- stator cross-section a U-shape
- armature a flat plate shape
- both of them may be made a U-shape in cross-section.
- a part for supporting the armature becomes unnecessary along with the conforming of the short circuit current detection property, meaning that it is possible to reduce the cost.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Breakers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/056774 WO2009122584A1 (ja) | 2008-04-04 | 2008-04-04 | 回路遮断器の短絡電流検出装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2261946A1 EP2261946A1 (en) | 2010-12-15 |
EP2261946A4 EP2261946A4 (en) | 2014-05-28 |
EP2261946B1 true EP2261946B1 (en) | 2015-09-02 |
Family
ID=41135003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08739880.6A Not-in-force EP2261946B1 (en) | 2008-04-04 | 2008-04-04 | Short circuit detection apparatus for circuit breaker |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2261946B1 (zh) |
JP (1) | JP5020374B2 (zh) |
CN (1) | CN101981647B (zh) |
WO (1) | WO2009122584A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106783437B (zh) * | 2017-01-20 | 2018-09-07 | 温州市新蓝天电器有限公司 | 一种断路器 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5675454U (zh) * | 1979-11-15 | 1981-06-19 | ||
JP2506486Y2 (ja) * | 1989-07-06 | 1996-08-07 | 富士電機株式会社 | 回路遮断器の過電流引外し装置 |
JP2861446B2 (ja) * | 1991-03-07 | 1999-02-24 | 富士電機株式会社 | 回路遮断器の電磁引外し装置 |
JPH07220610A (ja) * | 1994-02-02 | 1995-08-18 | Fuji Electric Co Ltd | 配線用遮断器 |
JP3227344B2 (ja) * | 1995-06-15 | 2001-11-12 | 松下電工株式会社 | 回路遮断器の短絡電流検出装置 |
JPH0950754A (ja) * | 1995-08-04 | 1997-02-18 | Kawamura Electric Inc | 回路遮断器の電磁装置 |
JPH10283899A (ja) | 1997-03-31 | 1998-10-23 | Mitsubishi Electric Corp | 回路遮断器の電磁引き外し装置 |
JP4094155B2 (ja) | 1999-02-12 | 2008-06-04 | 三菱電機株式会社 | 回路遮断器及びその過電流引きはずし装置 |
US6262645B1 (en) * | 1999-08-27 | 2001-07-17 | Eaton Corporation | Circuit interrupter with a trip mechanism having a biased latch |
DE60143410D1 (de) * | 2001-08-02 | 2010-12-16 | Mitsubishi Electric Corp | Luftunterbrecherschalter |
EP1732098A4 (en) * | 2004-01-28 | 2009-05-13 | Mitsubishi Electric Corp | BREAKER |
DE102006005697A1 (de) * | 2006-02-08 | 2007-08-16 | Moeller Gmbh | Einrichtung zum Auslösen eines elektrischen Schaltgeräts |
-
2008
- 2008-04-04 WO PCT/JP2008/056774 patent/WO2009122584A1/ja active Application Filing
- 2008-04-04 CN CN200880128337.3A patent/CN101981647B/zh active Active
- 2008-04-04 JP JP2010505241A patent/JP5020374B2/ja active Active
- 2008-04-04 EP EP08739880.6A patent/EP2261946B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
JPWO2009122584A1 (ja) | 2011-07-28 |
CN101981647B (zh) | 2013-10-30 |
EP2261946A4 (en) | 2014-05-28 |
CN101981647A (zh) | 2011-02-23 |
JP5020374B2 (ja) | 2012-09-05 |
EP2261946A1 (en) | 2010-12-15 |
WO2009122584A1 (ja) | 2009-10-08 |
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