EP1414057B1 - Luftunterbrecherschalter - Google Patents

Luftunterbrecherschalter Download PDF

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Publication number
EP1414057B1
EP1414057B1 EP01955554A EP01955554A EP1414057B1 EP 1414057 B1 EP1414057 B1 EP 1414057B1 EP 01955554 A EP01955554 A EP 01955554A EP 01955554 A EP01955554 A EP 01955554A EP 1414057 B1 EP1414057 B1 EP 1414057B1
Authority
EP
European Patent Office
Prior art keywords
magnetic
movable contact
air
flexible conductor
circuit interrupter
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.)
Expired - Lifetime
Application number
EP01955554A
Other languages
English (en)
French (fr)
Other versions
EP1414057A1 (de
EP1414057A4 (de
Inventor
J. Mitsubishi Electric Engineering K.K. KAWAKAMI
H. Mitsubishi Electric Engineering K.K. OKASHITA
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 EP1414057A1 publication Critical patent/EP1414057A1/de
Publication of EP1414057A4 publication Critical patent/EP1414057A4/de
Application granted granted Critical
Publication of EP1414057B1 publication Critical patent/EP1414057B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • 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
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal

Definitions

  • This invention relates to an air-break circuit interrupter for interrupting an overcurrent and, particularly, to a multi-pole air-break circuit interrupter for assuring a short-time current carrying capacity at the contact element portion.
  • Fig. 5 is a sectional side view of main portion of a conventional air-break circuit interrupter according to the preamble of claim 1 which is disclosed in Japanese Patent Laid-Open No. 6-089650
  • Fig 6 is a perspective view of main portion of the separable contact portion of the conventional air-break circuit interrupter
  • Fig. 7 is a view illustrating magnetic members disposed around the separable contact portion of the conventional air-break circuit interrupter.
  • 1 is an outer housing of the air-break circuit interrupter and 2 is a well-known operating mechanism including a toggle link.
  • a large closing force is required, so that the closing is achieved by a spring force charged in a closing spring 2d by a ratchet 2b and an eccentric cam 2c driven by a charge handle 2a or unillustrated motor.
  • a contact arm 4 is connected by a connecting pin 3, and the contact arm 4 is pivotably supported by a contact arm pin 5.
  • 6 is a movable contact member having a movable contact element 6a secured at one end and a flexible conductor 7 made of a thin conductor plates connected at the other end. The other end of the flexible conductor 7 is connected to the lower terminal 8 and the flexible conductor 7 is formed and arranged in a substantially U-shape from the position connected to the lower terminal 8.
  • the movable contact member 6 is rotatably supported by a movable contact member pin 6c inserted into a support hole 6b disposed at the central portion of the movable contact member 6 and a support hole in the contact arm 4.
  • 9 is an upper terminal which has at its one end a stationary contact element 9a to which the movable contact element 6a contacts.
  • 10 is contact pressure spring for urging the flexible conductor 7 at the connection portion with the movable contact member 6 towards the direction in which the U-shape of the flexible conductor 7 is spread. This urging force acts on the movable contact member 6 in the clockwise direction in the figure about the lever fulcrum of the movable contact member pin 6c as the contacting pressure of the movable contact element 6a to the stationary contact element 9a.
  • 11 is an arc extinguisher for extinguishing arcs generated across the separated contacts during the current interruption.
  • 12 are magnetic plates disposed between each pole phase.
  • These magnetic plates 12 are arranged to cover the side portion of the U-shape of the flexible conductor 7 and acts as a magnetic path for enhancing the electromagnetic force for suppressing the floating of the movable contact element 6a upon the flow of an overcurrent which will be described later.
  • an excessive fault current upon the load short circuiting to be interrupted by the air-break circuit interrupter is a three-phase alternating current that flows simultaneously through three poles. Therefore, three magnetic fluxes phase-shifted by 120 degrees pass through the magnetic plates 12 disposed between the phases. Therefore, when the interruption current is large, the magnetic plate 12 is magnetically saturated in the area of the same phase as the adjacent pole of the current and the magnetic flux is off set in the area of the opposite phase, so that the electromagnetic force (contact depressing force) for spreading the U-shaped flexible conductor 7 does not increase as compared to the increase in the current and the separating electromagnetic repulsive force between the stationary contact element 9a and the movable contact element 6a becomes greater, tending to the contact element floating. Even when the thickness of the magnetic plates 12 is increased, a contact floating prevention effect as expected cannot be obtained.
  • the movable contact 6 is subjected to the effect of the magnetic field of the adjacent pole which, together with the current flowing through itself, generates a lateral electromagnetic force.
  • This lateral force moves the the movable contact element 6a in the lateral direction and causes an electric arc to be generated across the movable contact element 6a and the stationary contact element 9a and generates damages in the contact surfaces, resulting in a less higher short-time current carrying capacity.
  • This invention has been made in order to solve the above problems and has as its object the provision of an air-break circuit interrupter in which the stationary contact element 9a and the movable contact element 6a are prevented from separating and lateral movement is prevented to suppress the arcing at the contact surface, thereby providing a large short-time current carrying capacity.
  • An air-break circuit interrupter includes a flexible conductor arranged in a substantially U-shaped configuration flexible in the direction of opening and closing for allowing contact opening and closing movements of the movable contact member having the movable contact element, a pivot shaft of a lever action for converting an electromagnetic force due to a current flowing through the flexible conductor in the direction of spreading the U-shape of the flexible conductor into a pressing force on the movable contact member, and a plurality of magnetic plates disposed between each pair of adjacent poles and side faces of the U-shape of the flexible conductor for enhancing the electromagnetic force, the magnetic plates being arranged in parallel and having a magnetic air gap defined between them.
  • the magnetic plates are arranged to extend to a space defined between the contact elements in each pole.
  • a housing of an insulating resin defining an outer housing of the air-break circuit interrupter is provided with an inter-phase partition wall for isolating the contact elements in each pole, and that the inter-phase partition wall has formed therein insertion slots, with an air gap corresponding to the magnetic air gap, in which the magnetic plates are inserted.
  • the inter-phase partition wall has separate insertion slots for the magnetic plates disposed at the side of the U-shape of the flexible conductor and a magnetic shield plate for the separable contact portion including the movable contact member.
  • the magnetic plates and each the magnetic shield plate includes a lamination of magnetic thin plates.
  • Fig. 1 is a sectional side view of main portion of the air-break circuit interrupter of the first embodiment of the present invention
  • Fig. 2 is a view illustrating the mounting arrangement of the magnetic plates to the housing according to the first embodiment.
  • 1 - 11 are components similar to those of the already described conventional device, so that their explanation will be omitted.
  • 13 are magnetic plates, which are disposed at the side portion of the U-shape of the flexible conductor 7.
  • These magnetic plates 13 are disposed between each poles of the multi-pole contact portion and magnetic air gap 13a is provided between the magnetic plates.
  • the magnetic plates 13 are held at predetermined positions by inserting them into insertion slots 1b formed in the inter-phase partition wall 1a of the box-shaped base made of an insulating resin material which is for the outer housing 1 of the air-break circuit interrupter as illustrated in Fig. 2 .
  • the insertion slots 1b are disposed in parallel to each other with a magnetic air gap 13a defined in the central portion of the inter-phase partition wall 1 a made of the insulating resin material which is the material for the base so that the plurality of magnetic plates 13 are mounted in parallel with the magnetic air gap 13a therebetween.
  • the air-break circuit interrupter having such structure, since the magnetic saturation and the magnetic flux cancellation between the magnetic flux by the current in a particular pole and the magnetic flux by the current in the adjacent pole are alleviated by the plurality of the magnetic plates 13 even when the current has phase differences between the poles, so that the electromagnetic force (contact depressing force) for spreading the U-shape of the flexible conductor 7 can be easily increased in proportion to the intensity of the current, enabling the separating of the contacts due to the electromagnetic repulsive force between the contacts to be suppressed.
  • Fig. 3 is a view showing the arrangement of the magnetic plates disposed around the separable contact portion of the second embodiment of the present invention.
  • 1 and 6 - 9 are the components similar to those in the above first embodiment.
  • 14 are a plurality of magnetic plates.
  • each of the magnetic plates 14 is made extended to the side portion of the separable contacts from the side portion of the U-shape of the flexible conductor 7.
  • the plurality of the magnetic plates 14 are mounted in place by inserting them into the parallel insertion slots (no reference numeral assigned in the figure) having the magnetic air gap 13a intervening therebetween and disposed in the inter-phase partition wall 1a.
  • the magnetic plates 14 shields the magnetic flux due to the current in the adjacent pole, so that the lateral movement of the movable contact member 6 due to the electromagnetic force generated by the current flowing through the contact member itself and the magnetic flux from the adjacent pole can be prevented.
  • the lateral shift of the movable contact member 6 can be alleviated and the short-time current carrying capacity can be further increased.
  • Fig. 4 is a view showing the arrangement of the magnetic plates and the shields according to the third embodiment of the present invention.
  • Fig. 4 is a view showing the arrangement of the magnetic plates and the shields according to the third embodiment of the present invention.
  • 1, 6 - 9 and 13 are the components similar to those of the previously-described first embodiment.
  • 15 are magnetic shield plates, which are disposed between each pole phase at the side portions of the movable contact member 6 and the contact separating portion of the movable contact element 6a and the stationary contact element 9a. Reinforcing portions 1c are provided between the magnetic plates 13 and the shield plates 15.
  • the inter-phase partition wall 1a is provided with elongated slots extending between the side portion of the U-shape of the flexible conductor 7 and the side portion of the contact separating portion, in which the magnetic plates 14 are inserted and held therein. Therefore, the side wall of the insertion slots may have cracks due to a massive electromagnetic force acting on the magnetic plates 14. Making the inter-phase partition wall 1a thicker in to cope with the cracks is not desirable because it makes the volume of the air-break circuit interrupter large.
  • the housing 1 may be molded integrally with the inter-phase partition walls 1a with an electrically insulating resin within mold dies. When the housing 1 is to be taken out form the mold dies, the above reinforcing portion 1c may be effectively used as the position at which the ejector pin is brought into contact.
  • the arrangement may be such that the magnetic plates 13 comprise a plurality of plates but the magnetic shield plate 15 comprises only a single plate.
  • the magnetic plates 13 and 14 as well as the magnetic shield plates 15 are arranged to have a plurality of plates with magnetic air gaps 13a therebetween, while the effect of the adjacent pole can be eliminated, the eddy current due to the circulating magnetic flux in the same pole is greater than that when a single magnetic plate and a single shield plate without any magnetic air gap, and the heat generation at the magnetic plates 13 and 14 and the magnetic shield plate 15 due to the eddy current loss within a normal rated current range is a cause of the loss of energy and the temperature rise of the air-break circuit interrupter
  • the magnetic plates 13 and 14 as well as the magnetic shield plates 15 can be made of a lamination of magnetic thin plates having a weak insulating treatment on the surface, whereby the eddy current loss can be alleviated to suppress the heat generation.
  • the air-break circuit interrupter having such structure, since the magnetic saturation and the magnetic flux cancellation between the magnetic flux by the current in a particular pole and the magnetic flux by the current in the adjacent pole are alleviated by the plurality of the magnetic plates 13 even when the current has phase differences between the poles, so that the electromagnetic force (contact depressing force) for spreading the U-shape of the flexible conductor 7 is increased in proportion to the intensity of the current, enabling the separating of the contacts due to the electromagnetic repulsive force between the contacts to be suppressed.
  • the extended magnetic plates 14 disposed between the poles at the contact opening and closing portion of the movable contact element 6a and the stationary contact element 9a shields the magnetic flux due to the current in the adjacent pole, so that the lateral movement of the movable contact member 6 due to the electromagnetic force generated by the current flowing through the contact member itself and the magnetic flux from the adjacent pole can be prevented.

Landscapes

  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (5)

  1. Luftunterbrecherschalter, umfassend:
    ein mehrpoliges Kontaktbauteil, das ein stationäres Kontaktelement (9a) und ein bewegliches Kontaktelement (6a) aufweist,
    einen flexiblen Leiter (7), der in der Öffnungs- und Verschließrichtung in einem im Wesentlichen U-förmigen Aufbau flexibel angeordnet ist, damit er Kontaktöffnungs- und verschließbewegungen eines das bewegliche Kontaktelement (6a) aufweisenden, beweglichen Kontaktbauteils (6) gewährt,
    eine Schwenkwelle für eine Hebelbewegung zum Konvertieren einer elektromagnetischen Kraft wegen eines durch den flexiblen Leiter (7) fließenden Stroms in der Spreizrichtung der U-Form des flexiblen Leiters in eine Drückkraft am beweglichen Kontaktbauteil (6),
    dadurch gekennzeichnet, dass
    eine Vielzahl von magnetischen Platten (13) zwischen jedem Paar der benachbarten Pole und Seitenflächen der U-Form des flexiblen Leiters angeordnet sind, damit sie die elektromagnetische Kraft verbessern, wobei die magnetischen Platten (13) parallel angeordnet sind und eine dazwischen definierte, magnetische Luftlücke (13a) aufweisen.
  2. Luftunterbrecherschalter gemäß Anspruch 1, dadurch gekennzeichnet, dass sich die magnetischen Platten (13) zu einem zwischen den Kontaktelementen in jedem Pol definierten Raum erstrecken.
  3. Luftunterbrecherschalter gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Gehäuse (1) eines isolierenden Harzes, das ein Außengehäuse des Luftunterbrecherschalters definiert, mit einer Zwischenphase-Trennwand (1a) versehen ist, damit die Kontaktelemente in jedem Pol isoliert werden, und dass die Zwischenphase-Trennwand (1a) darin Einführschlitze (1b) ausgebildet aufweist, und zwar mit einer der magnetischen Luftlücke entsprechenden Luftlücke, in der die magnetischen Platten (13) eingeführt werden.
  4. Luftunterbrecherschalter gemäß Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Zwischenphase-Trennwand (1a) separate Einführschlitze (1b) für die an der Seite der U-Form des flexiblen Leiters (7) angeordneten magnetischen Platten (13) und eine magnetische Schirmplatte (15) für den das bewegliche Kontaktbauteil (6) aufweisenden, separierbaren Kontaktabschnitt aufweist.
  5. Luftunterbrecherschalter gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die magnetischen Platten (13) und jede magnetische Platte (15) eine Laminierung aus magnetischen Dünn-Platten umfassen.
EP01955554A 2001-08-02 2001-08-02 Luftunterbrecherschalter Expired - Lifetime EP1414057B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/006644 WO2003015114A1 (fr) 2001-08-02 2001-08-02 Disjoncteur a air

Publications (3)

Publication Number Publication Date
EP1414057A1 EP1414057A1 (de) 2004-04-28
EP1414057A4 EP1414057A4 (de) 2005-03-16
EP1414057B1 true EP1414057B1 (de) 2010-11-03

Family

ID=11737615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01955554A Expired - Lifetime EP1414057B1 (de) 2001-08-02 2001-08-02 Luftunterbrecherschalter

Country Status (8)

Country Link
EP (1) EP1414057B1 (de)
JP (1) JP4599799B2 (de)
KR (1) KR100520928B1 (de)
CN (1) CN1226764C (de)
DE (1) DE60143410D1 (de)
ES (1) ES2351204T3 (de)
TW (1) TW517257B (de)
WO (1) WO2003015114A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4024726B2 (ja) * 2003-07-17 2007-12-19 三菱電機株式会社 多極回路遮断器
DE10347148B4 (de) * 2003-10-10 2006-01-19 Moeller Gmbh Schaltvorrichtung mit einfach unterbrechendem Drehkontakt
EP1732098A4 (de) * 2004-01-28 2009-05-13 Mitsubishi Electric Corp Unterbrecher
CN101223619B (zh) * 2005-07-21 2012-05-30 三菱电机株式会社 断路器
CN101981647B (zh) * 2008-04-04 2013-10-30 三菱电机株式会社 断路器的短路电流检测装置
FR2947667A1 (fr) * 2009-07-01 2011-01-07 Schneider Electric Ind Sas Asservissement via un dispositif de compensation magnetique des forces de repulsion et contacteur comprenant un tel dispositif
KR101168533B1 (ko) * 2011-03-14 2012-07-27 엘에스산전 주식회사 접지 스위치
CN112635263B (zh) * 2020-12-30 2022-09-13 滁州博杰科技有限公司 一种电磁辅助断路器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5925155U (ja) * 1982-08-07 1984-02-16 三菱電機株式会社 多極回路しや断器
US4891617A (en) * 1988-08-01 1990-01-02 Westinghouse Electric Corp. Rubber stops in outside poles
JPH0766736B2 (ja) * 1988-09-27 1995-07-19 寺崎電気産業株式会社 多極形電気開閉器
JP2633959B2 (ja) * 1989-06-30 1997-07-23 株式会社日立製作所 回路遮断器
JPH0689650A (ja) * 1992-09-07 1994-03-29 Mitsubishi Electric Corp 遮断器
JP2001101962A (ja) * 1999-09-29 2001-04-13 Mitsubishi Electric Corp 回路遮断器

Also Published As

Publication number Publication date
EP1414057A1 (de) 2004-04-28
TW517257B (en) 2003-01-11
DE60143410D1 (de) 2010-12-16
ES2351204T3 (es) 2011-02-01
WO2003015114A1 (fr) 2003-02-20
CN1226764C (zh) 2005-11-09
KR20030055272A (ko) 2003-07-02
JPWO2003015114A1 (ja) 2004-12-02
KR100520928B1 (ko) 2005-10-17
JP4599799B2 (ja) 2010-12-15
CN1441956A (zh) 2003-09-10
EP1414057A4 (de) 2005-03-16

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