EP1926112A1 - Système de contact électrique pour un appareil de coupure électrique - Google Patents

Système de contact électrique pour un appareil de coupure électrique Download PDF

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Publication number
EP1926112A1
EP1926112A1 EP06405490A EP06405490A EP1926112A1 EP 1926112 A1 EP1926112 A1 EP 1926112A1 EP 06405490 A EP06405490 A EP 06405490A EP 06405490 A EP06405490 A EP 06405490A EP 1926112 A1 EP1926112 A1 EP 1926112A1
Authority
EP
European Patent Office
Prior art keywords
contact
electrical
unit
force
bimetallic
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Withdrawn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
EP06405490A
Other languages
German (de)
English (en)
Inventor
Ruben Vogelsang
Jean-Claude Mauroux
Martin Lakner
Thomas Schoenemann
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.)
ABB Technology AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Priority to EP06405490A priority Critical patent/EP1926112A1/fr
Priority to US11/941,323 priority patent/US20080121504A1/en
Priority to JP2007301564A priority patent/JP2008130567A/ja
Priority to CNA2007101932573A priority patent/CN101226832A/zh
Publication of EP1926112A1 publication Critical patent/EP1926112A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
    • H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support

Definitions

  • the invention relates to the field of switching device technology, in particular relates to an electrical contact system for producing an electrical contact in an electrical switching device and to an electrical switching device according to the preamble of the independent claims.
  • Silver are surface-coated and in which the contact and the mating contact of the switch are resiliently pressed against each other in order to achieve an increase in the electrical conductivity in the contact area.
  • European Patent EP0844631 For example, there is known a switchable electrical contact system for a grounding switch having a contact pin and a tulip-shaped mating contact. To produce an electrical contact of the mating contact is pushed with its resilient contact fingers on the contact pin, wherein the individual contact fingers press resiliently on the contact pin.
  • the electrical contact between contact and mating contact is in need of improvement.
  • the contact resistance is increased and thus the electrical conductivity is not optimal, resulting in wear and unwanted heating of the contacts.
  • the contacts also often wear in the surface area, which for example in surface-coated contacts or contacts which work in a SF 6 gas atmosphere, contributes to reducing the electrical conductivity and thus also leads to undesirable heating in the contact area.
  • a shortened life and a high maintenance of the switching device are her consequence.
  • the present invention seeks to alleviate at least some of the above problems.
  • the object is achieved by an electrical contact system and by an electrical switching device having the features of the independent claims.
  • an electrical contact system of an electrical switching device which has a first and a second contact unit, wherein a contact force acts between the first and the second contact unit upon electrical contact. Furthermore, means for exerting the contact force are present, ie, in the case of electrical contact, a force is exerted by the first contact unit on the second contact unit or by the second contact unit on the first contact unit or by both contact units against each other.
  • the first contact unit is separable from the second contact unit by the distance between the two contact units is increased. The contact separation does not take place via the means for exercising the contact force. In the disconnected state, there is no electrical contact between the first and the second contact unit.
  • the inventive electrical contact system is characterized in that the means for exerting the contact force have a thermal expansion effect, which causes an increase in the contact force with increasing temperature of the means, ie when heat is applied to the thermal expansion in the means, which is about the expansion coefficient of the means and describe the temperature change in the media. It is completely irrelevant in what way the means heat is supplied.
  • An improvement of the electrical and mechanical contact in the contact area can be achieved in a wide variety of conditions, with high and low contact force.
  • the automatic increase in contact pressure with increasing temperature during operation of the switch advantageously leads to a reduction of the contact resistance and thus to an increased conductivity in the contact region.
  • the abrasion in the contact region of the contact units of the switch is advantageously reduced by the lower contact force, whereby the service life of the contact units of the switch is markedly increased.
  • an electrical switching device in particular a circuit breaker is proposed.
  • the electrical switching device comprises an electrical contact system and has the features described in the preceding section or in claim 1.
  • Fig. 1 shows a schematic view of a contact finger 12, a leaf spring 13 and an expansion body 15 of a contact unit 10, 20 which are parts of an electrical contact system not shown.
  • the leaf spring 13, which extends substantially along the length of the contact finger 12, is fixedly connected at one end to one end of the contact finger 12.
  • the expansion body 1 5 is located between the leaf spring 13 and contact fingers 12. It can be clamped, for example between leaf spring 13 and contact fingers 12. If heat is supplied to the contact unit 10, 20, eg caused by the flow of electrical current or by the medium surrounding the contact unit, the volume of expansion of the expansion body, which consists, for example, of an aluminum-bronze alloy and the material of the contact finger, is particularly high 12 and the leaf spring 13, for example a steel alloy, has a comparatively large expansion coefficient.
  • FIGS. 2a and 2b respectively show a view of a contact unit 10, 20 of a contact system, not shown, which consists of a bimetallic spring 14 and a contact finger 12.
  • the bimetal spring 14 is bent semicircularly at one of its ends and presses at this end on the contact finger 12.
  • the contact finger 12 is constructed for example of Metalliamellenstapeln and thus elastically deformable. However, the contact finger 12 can just as easily be formed in one piece and have an elasticity.
  • FIG. 2b shows the contact unit 10, 20 after it has been supplied with heat. Due to the different expansion coefficients of the two metals of the bimetallic spring 14, there is a change in shape in the spring 14.
  • the bent portion of the spring 14 is widened and thus increases the spring force with which the spring 14 presses the contact finger 12 presses on a mating contact, not shown .
  • the spring force of the bimetallic spring 14 and contact fingers 12 and spring 14 return to their initial state, as shown in Fig.2a, founded.Somit characterized in Fig. 2a, 2b contact unit 10th in that the means 14, which is a bimetallic spring, has a thermal expansion effect, which leads to an increase in the contact force.
  • FIG 3 shows another embodiment of the contact unit 10, 20 in which the self-resilient contact fingers 18 is made of bimetal.
  • the self-resilient contact fingers 18 is made of bimetal.
  • the bimetallic contact finger 18 is thus itself a means for increasing the contact force.
  • the self-resilient contact finger 18 is regarded as a cantilevered beam, the acting force F of the finger as well as its deflection s from the rest position can be easily calculated for a given geometry.
  • the pure spring force without consideration of a bimetallic effect for a cantilevered contact finger and taking into account the aforementioned parameters 34 N.
  • the contact pressure of the finger can be increased or decreased by more than 50% compared with a contact finger without bimetallic effect, if the finger has a temperature difference of 60 K. experiences.
  • the contact force F caused by the contact finger 12 and the bimetallic spring 14 is increased by more than 300% in comparison with a spring-action contact finger but without additional force caused by the bimetal.
  • Figure 7 shows a force-temperature diagram with the calculated force-contact temperature curves for a cantilevered copper-bronze bimetallic contact finger and a copper-zinc bimetallic contact finger.
  • Both the spring element 14 and the contact element 18 in this case have a bimetallic effect.
  • the spring element 14 and the self-resilient contact element 18 is not completely but only partially made of bimetal to increase the contact force, ie only a portion of the spring element and / or the contact element are made of bimetal.
  • an increase in the contact force with increasing temperature can also be achieved by applying material with a suitable coefficient of expansion to the resilient contact element 17 and / or the spring element 12, so that a bimetallic effect is achieved by means of the application.
  • the inventive contact system 1 of an electrical switching device shown in Figure 4 is the contact system 1 for each one Druckerpol a generator switch.
  • the isolator contact system 1 has a cylindrical contact unit 10 and a cylindrical counter contact formed as a contact unit 20, which axially on the Longitudinal axis A are arranged.
  • the electrical contact to the mating contact unit 20 is made via the contact fingers 12 of the contact unit 10, which are arranged annularly on the lateral surface of the contact unit 10 and secured by screw 19.
  • the contact surface 23 of the mating contact unit 20 is coated with silver.
  • the contact system 1 is closed and the contact fingers 12 are in electrical contact with the contact unit 20, for which purpose the contact fingers 12 are pushed onto the contact surface 23 of the contact unit 20.
  • the bimetallic springs 14 of the contact fingers 12 in this case exert a contact pressure with which the contact fingers 12 press against the contact surface 23 of the mating contact unit 20.
  • the contact force of the bimetallic spring 14 is increased by the fact that the contact system 1 is heated by the current flow in the contact units 10, 20 and due to the contact resistance between the contact units 10, 20.
  • the increased contact pressure in turn leads to a better electrical conductivity, ie a reduction of the contact resistance between the two contact units 10, 20 and thus to a decrease in the temperature in the contact system 1.
  • the contact system 1 assumes a more stable operating condition, it stabilizes automatically. Furthermore, a self-healing process occurs at the contact surfaces 16, 23. This self-healing process consists in automatically reducing the increase in contact resistance caused by oxidation or aging effects. Due to the increased contact resistance at the contact surfaces 16, 23 there is an increase in temperature in the contact units 10, 20 and thus an increased contact pressure of the contact fingers 1 2 on the contact unit 20. The increased contact force in turn improves the electrical contact between the contact surfaces 16, 23 and thus reduces the contact resistance. This improvement of the electrical conductivity at the contact surfaces 16, 23 to be understood as a self-healing effect thus likewise leads to more stable operating conditions of the contact system 1.
  • FIG. 5 shows the rated current contact system 1 of a generator switch with a cylindrical contact unit 10, a cylindrical mating contact unit 20 and a plurality of contact fingers 12 which are arranged annularly around the contact unit 20 and held by bimetallic springs 14 in the circumferential recess 25.
  • Each contact finger 12 has a bimetallic spring 14.
  • the bimetallic springs 14 rest on both sides in the recess 25 and are shaped such that a projection in the center of the springs 14 engages in a recess 26 of the contact fingers 12.
  • the selective intermeshing of spring 14 and contact fingers 12 allows a tilting movement of the contact finger 12 about its attachment point. In the closed state of the switch is ever one end of the contact finger 12 on the contact unit 10 and on the Schwarzköntaktmaschine 20 on.
  • the heating of the bimetallic springs 14 causes the bimetallic effect in the springs 14, an increase in the contact force between the contact fingers 12 and contact units 10, 20th
  • the illustrated embodiments may be further varied without departing from the scope of the claims as defined in the claims.
  • the contact finger 12 and the bimetallic spring 14 in FIG 6 also consist of one piece and have the properties of a bimetallic spring. Furthermore, it is not necessary that the spring elements 14 or the contact fingers 12, 18 are made of bimetal. Both contact fingers 12, 18 and spring elements 14 may consist of a non-metal or other composite material, which has a bimetal effect.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Contacts (AREA)
EP06405490A 2006-11-23 2006-11-23 Système de contact électrique pour un appareil de coupure électrique Withdrawn EP1926112A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06405490A EP1926112A1 (fr) 2006-11-23 2006-11-23 Système de contact électrique pour un appareil de coupure électrique
US11/941,323 US20080121504A1 (en) 2006-11-23 2007-11-16 Electrical contact system for an electrical switching device
JP2007301564A JP2008130567A (ja) 2006-11-23 2007-11-21 電気的スイッチング・デバイスのための電気的コンタクト・システム
CNA2007101932573A CN101226832A (zh) 2006-11-23 2007-11-23 用于电气开关装置的电接触系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06405490A EP1926112A1 (fr) 2006-11-23 2006-11-23 Système de contact électrique pour un appareil de coupure électrique

Publications (1)

Publication Number Publication Date
EP1926112A1 true EP1926112A1 (fr) 2008-05-28

Family

ID=37891433

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06405490A Withdrawn EP1926112A1 (fr) 2006-11-23 2006-11-23 Système de contact électrique pour un appareil de coupure électrique

Country Status (4)

Country Link
US (1) US20080121504A1 (fr)
EP (1) EP1926112A1 (fr)
JP (1) JP2008130567A (fr)
CN (1) CN101226832A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013139573A1 (fr) * 2012-03-20 2013-09-26 Siemens Aktiengesellschaft Système de contact et appareil de coupure électrique

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101463043B1 (ko) * 2009-09-01 2014-11-18 엘에스산전 주식회사 회로차단기의 슬라이드형 가동접촉자 어셈블리
CN105810462B (zh) * 2016-05-05 2018-05-25 许继（厦门）智能电力设备股份有限公司 一种耐压工装接触头连接结构
DE102017109210B4 (de) * 2017-04-28 2023-10-12 Tdk Electronics Ag Relais
CN119864256A (zh) 2018-03-20 2025-04-22 松下知识产权经营株式会社 切断装置
CN118572481B (zh) * 2024-08-02 2024-12-10 上海拔山自动化技术有限公司 一种喷涂机器人用滑环供电装置及喷涂机器人

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285624A (en) 1939-11-04 1942-06-09 Westinghouse Electric & Mfg Co Elimination of contact burning on controls
US3833873A (en) * 1973-12-14 1974-09-03 Texas Instruments Inc Thermal protector
EP0844631A2 (fr) 1996-11-25 1998-05-27 Asea Brown Boveri AG Appareillage de commutation électrique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1699858A (en) * 1926-04-17 1929-01-22 Russell Mfg Co Contact finger for electrical controllers and switches
US1924647A (en) * 1931-02-14 1933-08-29 Service Station Equipment Comp Thermostat
US2014958A (en) * 1932-12-05 1935-09-17 Square D Co Thermal relay
US2039241A (en) * 1935-05-11 1936-04-28 Monitor Controller Co Thermally controlled switch
US2762885A (en) * 1953-03-05 1956-09-11 S W Farber Inc Control means for electric apparatus
US2794884A (en) * 1955-10-24 1957-06-04 Gen Motors Corp Circuit breaker
US3718162A (en) * 1971-11-05 1973-02-27 Gen Motors Corp Circuit breaker
DE19830232A1 (de) * 1998-07-07 2000-01-13 Abb Research Ltd Stromkontaktanordnungen eines Stromschalters
DE10103788A1 (de) * 2001-01-29 2002-08-22 Ellenberger & Poensgen Thermisch auslösbarer Schutzschalter
DE50308222D1 (de) * 2003-07-02 2007-10-31 Abb Technology Ag Kontaktfinger für Hochleistungsschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2285624A (en) 1939-11-04 1942-06-09 Westinghouse Electric & Mfg Co Elimination of contact burning on controls
US3833873A (en) * 1973-12-14 1974-09-03 Texas Instruments Inc Thermal protector
EP0844631A2 (fr) 1996-11-25 1998-05-27 Asea Brown Boveri AG Appareillage de commutation électrique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013139573A1 (fr) * 2012-03-20 2013-09-26 Siemens Aktiengesellschaft Système de contact et appareil de coupure électrique

Also Published As

Publication number Publication date
US20080121504A1 (en) 2008-05-29
CN101226832A (zh) 2008-07-23
JP2008130567A (ja) 2008-06-05

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