EP2937886A1 - Formgehäuseschutzschalter mit unter druck stehender kontakthaltestruktur - Google Patents

Formgehäuseschutzschalter mit unter druck stehender kontakthaltestruktur Download PDF

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Publication number
EP2937886A1
EP2937886A1 EP12885188.8A EP12885188A EP2937886A1 EP 2937886 A1 EP2937886 A1 EP 2937886A1 EP 12885188 A EP12885188 A EP 12885188A EP 2937886 A1 EP2937886 A1 EP 2937886A1
Authority
EP
European Patent Office
Prior art keywords
contact
moveable
circuit breaker
pressure unit
unit
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.)
Withdrawn
Application number
EP12885188.8A
Other languages
English (en)
French (fr)
Other versions
EP2937886A4 (de
Inventor
Byung Soo An
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.)
HD Hyundai Electric Co Ltd
Original Assignee
Hyundai Heavy Industries Co Ltd
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 Hyundai Heavy Industries Co Ltd filed Critical Hyundai Heavy Industries Co Ltd
Publication of EP2937886A1 publication Critical patent/EP2937886A1/de
Publication of EP2937886A4 publication Critical patent/EP2937886A4/de
Withdrawn legal-status Critical Current

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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
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • 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
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H01H2011/067—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier by deforming, e.g. bending, folding or caulking, part of the contact or terminal which is being mounted
    • 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

Definitions

  • This application relates to a molded case circuit breaker having a pressurized contact structure and more particularly to a molded case circuit breaker having a pressurized contact structure capable of preventing a deviation of a moveable contact according to a solder fusion between a movable element and a moveable contact although a temperature of a current carrying unit is abnormally increased due to an inflow of an accidental current.
  • a molded case circuit breaker is a circuit breaker for an overload and short circuit protections and is accommodated in a molded case.
  • the molded case circuit breaker is used for protecting low voltage in-house below an AC 600V or a DC 250V voltage and is usually called as an NFB.
  • a trip device is classified into a thermal trip (curved by heating a bimetal through a current flown into a circuit breaker), an overcurrent trip pulling an iron coil through an overcurrent, a thermal magnetic trip and an electric trip.
  • the molded case circuit breaker is a device for automatically blocking a circuit in an electrical overload state to protect a circuit and load, and includes a movable element and a fixable element being in contact or in noncontact to configure a circuit for flowing a constant current.
  • FIG. 1 is a diagram illustrating a conventional circuit breaker
  • FIG. 2 is a diagram extracting a switchgear unit in FIG. 1
  • FIG. 3 is a diagram separating a movable element from a fixable element in FIG. 2 .
  • a conventional circuit breaker includes a cover 1 containing components thereof, a switchgear unit 3 mechanically turning ON/OFF a case 2 and an electric line, a trip unit 4 detecting an abnormal current and a fault current, an arc chamber unit 5 removing an arc being generated between contact points in a circuit interruption and a current limiter limiting a fault current by an electronic repulsion.
  • the current limiter includes fixable elements 21a and 21 b being fixed on a main circuit, a moveable element 22 moving according to a turn-on or turn-off of the switchgear unit 3, a shaft 23 enclosing the moveable element 22 and performing a rotary motion according to a turn-on or turn-off of the switchgear unit 3, a contact spring 24 maintaining a contact force when the moveable element 22 and the fixable elements 21 a and 21 b are contacted, a moveable element pin 25 connecting the contact spring 24, the moveable element 22 and the shaft 23 and a contact spring pin 26 supporting one side of the contact spring 24.
  • the fixable element 21 a is connected to a power supply terminal and the fixable element 21 b is connected to a load terminal.
  • a short circuit current flows into a main circuit unit (the fixable element - the moveable element - a terminal unit)
  • an electronic repulsion (Fe) and an arc are generated between the fixable elements 21 a and 21 b and the moveable element 22 to lift the moveable element 22.
  • a current is decreased by an arc voltage thereby the electronic repulsion (Fe) is decreased.
  • the electronic repulsion (Fe) is smaller than a contact force (Fs) by the contact spring 24, the moveable element 22 is contacted with the fixable elements 21 a and 21 b as described in FIG. 2 .
  • a tensile force of the contact spring 24 is not constantly maintained according to a movement trajectory increase generated due to an O.T (value of converting a rotation angle of the shaft to a distance) of the moveable element 22 and a separation distance increase generated when the moveable element 22 is separated.
  • Korean Patent Publication No. 10-2009-0085976 relates to a molded case circuit breaker and discloses a structure of the molded case circuit breaker where a moveable contact and a fixed contact may not be in contact.
  • Such molded case circuit breaker has a problem that a temperature of a current carrying unit increases when the fault current flows in, a contact deviation is generated due to a solder fusion between the moveable element and the contact point, a contact deviation occurs after a break operation of the molded case circuit breaker not to guarantee a current carrying reliability.
  • These problems may cause a rapid decrease of circuit breaker duration and product manufacturer reliability thereby sales for other products of the manufacturer may be decreased.
  • this application proposes to provide the molded case circuit breaker having a pressurized contact unit for preventing a moveable contact deviation according to a solder fusion between a moveable element and a moveable contact although a temperature of a current carrying unit excessively increases in an inflow of a fault current.
  • This application proposes to provide a molded case circuit breaker that prepares for a physical fixing structure between the moveable element and the moveable contact to prevent a moveable contact deviation despite a solder fusion and to increase duration and current carrying reliability despite an inflow of a fault current.
  • This application proposes to provide a molded case circuit breaker that forms a gradient moveable contact corresponding to a pressure unit shape for preventing a deviation when the molded case circuit breaker operates due to an abnormal temperature increase of a current carrying unit to increase a physical fixability.
  • This application proposes to provide a molded case circuit breaker that prepares for a weld unit between a pressure unit and a moveable contact for preventing a deviation when the molded case circuit breaker operates due to an abnormal temperature increase of a current carrying unit to retain a same fixability after a fusion between a pressure unit and a moveable contact is heated and cooled.
  • this application uses a molded case circuit breaker with a pressurized contact unit including a moveable element being rotatably installed on a main body and the moveable element forming a pressure unit with a constant gradient in one side thereof, a moveable contact being formed with correspond to the gradient of the pressure unit to be fixed by the pressure unit and a fixable element being in a contact with the moveable contact to solve technical problems.
  • this application uses a molded case circuit breaker with a pressurized contact unit being comprised of the pressure unit that is formed with a constant gradient at both of the one side of the moveable element to solve technical problems.
  • this application uses a molded case circuit breaker with a pressurized contact unit being comprised of the pressure unit that is formed with a constant gradient along an outer peripheral of the one side of the movable element to solve technical problems.
  • this application uses a molded case circuit breaker with a pressurized contact unit further including a weld unit being welded to attach the moveable contact and the pressure unit to contact surfaces of the moveable contact and the pressure unit to solve technical problems.
  • this application uses a molded case circuit breaker with a pressurized contact unit further including a weld unit being welded to attach the moveable contact and the moveable element to contact surfaces of the moveable contact and the moveable element to solve technical problems.
  • a disclosed technology of this application proposes to solve the above described technical problems and provides various effects.
  • the various effects are corresponded to 1 preventing a moveable contact deviation according to a solder fusion between a moveable element and a moveable contact although a temperature of a current carrying unit excessively increases in an inflow of a fault current, 2 preparing for a physical fixing structure between the moveable element and the moveable contact to prevent a moveable contact deviation despite a solder fusion and to increase duration and current carrying reliability despite an inflow of a fault current, 3 forms a gradient moveable contact corresponding to a pressure unit shape for preventing a deviation when the molded case circuit breaker operates due to an abnormal temperature increase of a current carrying unit to increase a physical fixability and 4 preparing for a weld unit between a pressure unit and a moveable contact for preventing a deviation when the molded case circuit breaker operates due to an abnormal temperature increase of a current carrying unit to retain a same fixability after a fusion between a pressure unit
  • first and second can be used to refer to various components, but the components may not be limited to the above terms. The terms will be used to discriminate one component from the other component. For instance, the first component may be referred to the second component and vice versa without departing from the right of the disclosure.
  • a component When a component is referred to as being “connected to” or “linked to” another component, the component may be directly connected to or linked to another component or an intervening component may be present therebetween. In contrast, if a component is referred to as being “directly connected to” or “directly linked to” another component, an intervening component may not be present therebetween.
  • the terms used in the specification are for the purpose of explaining specific embodiments and have no intention to limit the disclosure. Unless the context indicates otherwise, the singular expression may include the plural expression.
  • the term "include” or “has” will be used to refer to the feature, the number, the step, the operation, the component, the part or the combination thereof without excluding the presence or addition of one or more features, the numbers, the steps, the operations, the components, the parts or the combinations thereof.
  • FIG. 4 is a perspective diagram illustrating a molded case circuit breaker having a pressurized contact unit according to a disclosure of this application.
  • the molded case circuit breaker with a pressurized contact unit 1 includes a moveable element 10, a moveable contact 30 and a fixable element 50.
  • the moveable element 10 is rotatably installed on a main body and is in contact with the fixable element 50 through the moveable contact 30.
  • One side of the moveable element 10 is not plane shaped but projection shaped along both of the one side or along an outer peripheral to fix the moveable contact 30.
  • the moveable contact 30 includes a gradient corresponding to the projection shape of the moveable element 10 so that the moveable contact 30 may be physically fixed at a projection of the moveable element 10. Therefore, the moveable contact 30 does not physically deviate despite a solder fusion between the moveable element 10 and the moveable contact 30.
  • the fixable element 50 has a fixed contact at one side thereof and is in contact with the moveable contact 30 in a general current carrying status. A repulsive force between the moveable contact 30 and the fixed contact is generated when a fault current flows in or other accidents occur. When an arc between these contacts is generated, the moveable element 10 rotates to clockwise direction and a shaft is guided by the shaft wall to downward slide.
  • FIG. 5 is a side elevation diagram illustrating a molded case circuit breaker having a pressurized contact unit according to a disclosure of this application.
  • the moveable element 10 includes a pressure unit 11 having a constant gradient at one side thereof.
  • the pressure unit 11 may be formed so that the pressure unit 11 has a constant gradient at both of the one side of the moveable element 10 and has a constant gradient along an outer peripheral of the one side of the movable element 10.
  • a shape of the pressure unit 11 may be varied in a condition when the pressure unit 11 may physically fix the moveable contact 30 and this variation may be obvious to those skilled in the art.
  • the pressure unit 11 is a projection shaped so that the pressure unit 11 is projected toward the moveable contact 30 and has a gradient fixing the moveable contact 30.
  • the diagram illustrates a structure having projections at both sides, any shape for physically fixing the moveable contact 30 may be used in a condition when the pressure unit 11 may physically fix the moveable contact 30 and this variation may be obvious to those skilled in the art.
  • the molded case circuit breaker includes a weld unit 13.
  • the weld unit 13 may directly connect the moveable contact 30 and the moveable element 10 by applying a heat and pressure without the pressure unit 11 or may strongly connect the moveable contact 30 and the moveable element 10 by applying a heat and pressure with the pressure unit 11.
  • FIG. 6 is a side elevation diagram illustrating a before and after pressure application.
  • the pressure unit is illustrated at both of a bottom side of the moveable element and the movable contact is illustrated.
  • a left diagram illustrates a case before the pressure unit applies pressure to the moveable contact and a right diagram illustrates a case after the pressure unit applies pressure to the moveable contact.
  • the movable contact may be fixed when the pressure is applied along the both sides or the outer periphery and may be formed in a structure that increases reliability, decreases process complexity and remarkably decreases a manufacture cost.
  • FIG. 7 is a cross-sectional diagram illustrating a molded case circuit breaker having a pressurized contact unit according to a disclosed invention of this application.
  • the molded case circuit breaker includes the pressure unit 11 to fix the moveable contact 30 thereby the moveable contact 30 may not deviate with an up and down movement of the moveable element 10 and may prevent the deviation with a temperature increase due to a fault current inflow.
  • the molded case circuit breaker has the weld unit 13 instead of the pressure unit 11 to prevent a deviation of the moveable contact 30 or has the pressure unit 11 and the weld unit 13 to prevent the deviation of the moveable contact 30 and these may be selected or changed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Breakers (AREA)
EP12885188.8A 2012-12-23 2012-12-23 Formgehäuseschutzschalter mit unter druck stehender kontakthaltestruktur Withdrawn EP2937886A4 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2012/011332 WO2014098292A1 (ko) 2012-12-23 2012-12-23 가압형 접점 고정 구조의 배선용 차단기

Publications (2)

Publication Number Publication Date
EP2937886A1 true EP2937886A1 (de) 2015-10-28
EP2937886A4 EP2937886A4 (de) 2016-09-07

Family

ID=50978586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12885188.8A Withdrawn EP2937886A4 (de) 2012-12-23 2012-12-23 Formgehäuseschutzschalter mit unter druck stehender kontakthaltestruktur

Country Status (3)

Country Link
EP (1) EP2937886A4 (de)
CN (1) CN104011825A (de)
WO (1) WO2014098292A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115148546B (zh) * 2022-08-07 2023-09-26 浙江西屋电气股份有限公司 一种远程操控分合闸的单极微型断路器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100417579B1 (ko) * 2001-04-13 2004-02-05 엘지산전 주식회사 회로차단기의 중성극 개폐장치
KR100574788B1 (ko) * 2004-10-07 2006-04-27 엘에스산전 주식회사 배선용 차단기의 접촉자 어셈블리
CN100418173C (zh) * 2005-04-15 2008-09-10 德力西电气有限公司 断路器的触头系统
KR100676968B1 (ko) * 2005-12-29 2007-02-02 엘에스산전 주식회사 한류형 배선용 차단기의 접촉자 어셈블리
KR100978270B1 (ko) 2008-02-05 2010-08-26 엘에스산전 주식회사 배선용 차단기의 한류기구장치
JP2010287375A (ja) * 2009-06-10 2010-12-24 Fuji Electric Fa Components & Systems Co Ltd 回路遮断器
JP5568895B2 (ja) * 2009-06-10 2014-08-13 富士電機機器制御株式会社 回路遮断器
JP5493757B2 (ja) * 2009-11-19 2014-05-14 富士電機機器制御株式会社 回路遮断器

Also Published As

Publication number Publication date
EP2937886A4 (de) 2016-09-07
CN104011825A (zh) 2014-08-27
WO2014098292A1 (ko) 2014-06-26

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