JPWO2003015114A1 - Air circuit breaker - Google Patents

Air circuit breaker Download PDF

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Publication number
JPWO2003015114A1
JPWO2003015114A1 JP2002580697A JP2002580697A JPWO2003015114A1 JP WO2003015114 A1 JPWO2003015114 A1 JP WO2003015114A1 JP 2002580697 A JP2002580697 A JP 2002580697A JP 2002580697 A JP2002580697 A JP 2002580697A JP WO2003015114 A1 JPWO2003015114 A1 JP WO2003015114A1
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magnetic
contact
circuit breaker
air circuit
movable contact
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JP4599799B2 (en
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淳一 川上
淳一 川上
広史 岡下
広史 岡下
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • 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
    • H01H1/50—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
    • 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

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

Abstract

可動接点６ａの浮き上がりを押え、接点の横ズレを抑え、接点面の発弧をしにくくして短時間通電容量の高い気中遮断器を得る。可動接点６ａを有する可動接触子６を開閉可能に開閉方向に屈曲し略Ｕ字形に整形した可撓導体７と、通電電流による可撓導体７のＵ字形部の開拡方向の電磁力を可動接点６ａの押圧力に変換する梃子作用の支軸６ｃと、可撓導体のＵ字形の側面極間に配置して上記電磁力を強化する磁性板１３を並列配置複数枚にしてその間に磁気空隙１３ａを介在させる。また、各極間の磁性板を可撓導体のＵ字形の側面から開閉接点の側部にまで延在させてもよい。An air circuit breaker having a high short-time current carrying capacity by suppressing the floating of the movable contact 6a, suppressing the lateral displacement of the contact, making it difficult to fire the contact surface. The movable conductor 6 having the movable contact 6a is bent in the opening and closing direction so as to be openable and closable, and the flexible conductor 7 shaped into a substantially U-shape, and the electromagnetic force in the expanding direction of the U-shaped portion of the flexible conductor 7 caused by the supplied current is movable. A plurality of magnetic plates 13 arranged between the U-shaped side poles of the flexible conductor and the magnetic plate 13 for enhancing the electromagnetic force are arranged in parallel, and a magnetic air gap is provided between the support shaft 6c for converting the pressing force of the contact 6a and the lever shaft 6c. 13a is interposed. Further, the magnetic plate between the poles may extend from the U-shaped side surface of the flexible conductor to the side of the switching contact.

Description

技術分野
この発明は、過大電流を遮断する多極気中遮断器に関し、とくに開閉接点部分の短時間通電容量を確保するためのものである。
背景技術
第５図は、例えば日本国特開平６−０８９６５０号公報に示された従来の気中遮断器の要部側断面図、第６図は従来の気中遮断器の開閉接点部の要部斜視図、第７図は従来の気中遮断器の開閉接点部の周囲に設けられた磁性部材の配置を示した図である。
図において、１は気中遮断器の外殻函体、２は周知のトグルリンクからなる開閉機構である。この様な気中遮断器では大きな投入力を必要とするためチャージハンドル２ａまたは図示していないモータによりラチェット２ｂと偏心カム２ｃにより投入バネ２ｄに蓄勢したバネ力により投入されるようになっている。
開閉機構２の下部リンク２ｅには連結ピン３を介してコンタクトアーム４が連設され、このコンタクトアーム４はコンタクトアームピン５により回動可能に軸支されている。６は可動接触子であり、一端に可動接点６ａが固着され、他端には薄板導体を積層した可撓導体７が接続されている。可撓導体７の終端は下側端子８に接続され、可撓導体７は下側端子８の接続位置から略Ｕ字形に成形配置される。また、可動接触子６の中央付近に設けられた支点穴６ｂとコンタクトアーム４の支持穴に可動接触子ピン６ｃを挿通して可動接触子６が揺動可能に支持される。９は上側端子であり、一端に可動接点６ａに接離する固定接点９ａが設けられている。１０は接圧バネであり、可撓導体７のＵ字形を開く方向へ可動接触子６との接続部を付勢する。この付勢力は可動接触子ピン６ｃを梃子支点にして可動接触子６を図上で時計方向に働き可動接点６ａの固定接点９ａへの接圧力にする。１１は電流遮断時に接点間に発生するアークを消滅させる消弧装置である。１２は各極相間に配設された磁性板である。この磁性板１２は可撓導体７のＵ字形の側部を覆うように配設され、後述の過大電流が通電された際に可動接点６ａ浮き上がり抑制するための電磁力を強化する磁路となっている。
次に従来の気中遮断器の事故電流時の接点押え込み動作について説明する。気中遮断器に過大な事故電流が通電されると、通常は接圧バネ１０によって固定接点９ａへ押えられている可動接点６ａは電磁反発力により開離しようとする。この過大電流は可撓導体７を通過するのであって可撓導体７はＵ字形を開く方向へ電磁力が働き過大電流が通過しても接点浮き上がりが起こらず、接点間発弧をさせないで短時間通電容量が増大するようにしている。
しかし、このような気中遮断器が遮断する負荷短絡時の過大事故電流は３相交流であり、３極を同時に通過する。このため、相間に配設された磁性板１２には１２０度位相のずれた磁束が同時に通る。このため、遮断電流が大きくなると電流の隣接極と同相域では磁性板１２が磁気飽和、また逆相域では磁束が相殺され、可撓導体７のＵ字形を開く電磁力（接点押圧力）が電流値の増加に比して大きくならず、固定接点９ａと可動接点６ａ間の開離電磁反発力が勝り接点が浮き上がり易くなる。そこで磁性板１２の板厚を増しても期待するほどの接点浮き上がり防止効果が得られなかった。
また、磁性板１２が可撓導体７の周辺のみへの配置のため、可動接触子６は隣接極の磁界の影響を受け自極電流との電磁力により横方向への力を受ける。この横方向への力は可動接点６ａを横方向へ動かせ固定接点９ａとの間に発弧を生じ接点面損傷により短時間通電容量が上がらないという問題点があった。
この発明は、かかる問題点を解決するためになされたものであり、事故電流が大きくなっても隣接極の磁束の影響を抑制し、固定接点９ａと可動接点６ａの浮き上がりを押え、接点の横ズレを抑え、接点面の発弧をしにくくして短時間通電容量の高い気中遮断器を得ることを目的とする。
発明の開示
この発明に係る気中遮断器は、開閉接点のうちの可動接点を有する可動接触子を開閉可能に開閉方向に屈曲し略Ｕ字形に整形した可撓導体と、通電電流による可撓導体のＵ字形部の開拡方向の電磁力を可動接点の押圧力に変換する梃子作用の支軸と、可撓導体のＵ字形の側面極間に配置した電磁力を強化する磁性板を並列配置複数枚にしてその間に磁気空隙を介在させたものである。
また、各極間の磁性板を可撓導体のＵ字形の側面から開閉接点の側部にまで延在させたものである。
そして、多極の開閉接点を絶縁隔離する相間隔壁に磁気空隙相当の空隙をもって穿設された挿入溝に磁性板を挿入配設するようにしたものである
また、磁性板を可撓導体のＵ字形側面配置と可動接触子を含む開閉接点部の遮磁板に分割して、相間隔壁に各個の配設挿入溝を独立して設けたものである。
そしてまた、各磁性板及び各遮磁板を磁性薄板の積層体で構成したものである。
発明を実施するための最良の形態
実施の形態１．
第１図は、この発明の実施の形態１による気中遮断器の要部縦断面図、
第２図は、実施の形態１の磁性板を函体へ取り付け配設を説明する図である。
図において、１〜１１は上記従来装置での説明と同様のものであり、説明を省略する。１３は磁性板であり、可撓導体７のＵ字形の側部に配設される。この磁性板１３は多極開閉部の各極間に配設され複数枚からなり板間には磁気空隙１３ａを持たせている。
磁性板１３は第２図に示すように気中遮断器の外殻函体１を形成する絶縁性樹脂材で成形された函体であるのベースの相間隔壁１ａに設けられた挿入溝１ｂに挿入することで所定位置に取り付けられる。挿入溝１ｂは複数枚の磁性板１３を磁気空隙１３ａを確保して平行に取り付けられるようにベース成形材の絶縁性樹脂材の相間隔壁１ａの中央部を磁気空隙１３ａにして並列に設けられている。
この様に構成された気中遮断器では、自極の電流による磁束と隣接極電流による磁束は磁気空隙１３ａが分離して、複数の磁性板１３により極毎の位相差がある電流であっても、磁気飽和、磁束打ち消しが軽減されるので、可撓導体７のＵ字形を開く電磁力（接点押圧力）が電流の大きさに比例して増加し易くなり、接点間の電磁反発による接点浮き上がりを抑えることができる。
従って、過大電流が通電されるとき接点の浮き上がりがなくなるので短時間通電容量が増大することができる。
実施の形態２．
第３図は、実施の形態２の開閉接点部の周囲に設けられた磁性板の配置を示した図である。図において、１、６〜９は上記実施の形態１と同様のものである。１４は複数枚の磁性板である。この実施の形態２においては、各磁性板１４を可撓導体７のＵ字形側部から開閉接点の側部にまで延在させている。複数の磁性板１４は相間隔壁１ａに設けられた磁気空隙１３ａを介在した並列に設けられた挿入溝（採番なし）に挿入して取り付け配置がなされる。
このように可動接触子６を含めた開閉接点の側部に磁性板１４を延在配置することで、隣接極の電流による周回磁束を磁性板１４が遮蔽するので可動接触子６が自己の電流と隣接極周回磁束の電磁力により横ズレを起こすのを防止する。
従って、上記実施の形態１で説明の可撓導体７のＵ字形を開く電磁力（接点押圧力）の増加の接点浮き上がりを抑えることに加え、可動接触子６の横ズレが抑えられ、さらなる短時間通電容量を増大させることができる。
実施の形態３．
第４図は、実施の形態３の開閉接点部の周囲に設けられた磁性板の配置を示した図である。図において、１、６〜９、１３は上記実施の形態１と同様のものである。１５は遮磁板であり、磁性板１３と別に可動接触子６及び可動接点６ａと固定接点９ａの接点開閉部の側部に各極相間に配設されている。磁性板１３と遮磁板１５の間は補強部１ｃとなっている。
上記実施の形態２では相間隔壁１ａに可撓導体７のＵ字側部から接点開閉部の側部に至る長い挿入溝が設けられ、これに磁性板１４を挿入配置される。このため、磁性板１４が受ける強大な電磁力により挿入溝側壁にひび割れを生ずることがあり、この対策として相間隔壁１ａを厚くすることは気中遮断器の体積を大型化するので望ましくない。そこで、磁性板１３は磁路確保、遮磁板１５は隣接極の遮磁の機能を持たせるように分割した構成で、通電遮断させたところ短時間通電容量の低下は無く、従前の相間隔壁１ａの厚さで、磁性板１３および遮磁板１５の挿入溝を各独立させ補強部１ｃを設ける構成で相間隔壁１ａのひび割れを防止することができた。そして、相間隔壁１ａと一体に函体１は絶縁性樹脂を成形金型成形にて製造される。この成形金型から函体１を取り出す際のエゼクターピンの当接位置として上記補強部１ｃの場所は有効である。
なお、上記説明では遮磁板１５も磁気空隙１３ａを有した複数枚としているが、相間隔壁１ａの強度確保の面から補強部１ｃを具備させて、磁性板１３は複数枚に、遮磁板１５は１枚の構成であってもよい。
実施の形態４．
次に、磁性板１３、１４及び遮磁板１５を磁気空隙１３ａを隔て複数枚に配置することは、隣接極の磁束の影響はなくなるが、自極の周回磁束による渦電流は磁気空隙を持たず１枚で構成する磁性板、遮磁板に比べ多くなり、通常の定格電流範囲での渦電流損による磁性板１３、１４及び遮磁板１５の発熱はエネルギーロスと気中遮断器の温度上昇の原因となる。
この対策としては、表面を弱絶縁処理した磁性薄板を積層した磁性板１３、１４及び遮磁板１５にすることで渦電流損を軽減して発熱を抑えることができる。
産業上の利用可能性
以上のように、この発明の気中遮断器においては、自極の電流による磁束と隣接極の電流による磁束は磁気空隙１３ａが分離して、極毎の位相差がある電流であっても、磁性板１３での磁気飽和、磁束打ち消しが軽減されるので、可撓導体７のＵ字形を開く電磁力（接点押圧力）が電流の大きさに比例して増加し、接点間の電磁反発による接点浮き上がりを抑える。また、可動接点６ａと固定接点９ａの接点開閉部の極間に設けられた遮磁板１４は隣接極の電流による周回磁束を遮蔽して可動接触子６が自己の電流との電磁力により横ズレを起こすのを防止する。
従って、過大電流が通電されるとき接点の浮き上がりと横ズレがなくなるので短時間通電容量を増大させる。
【図面の簡単な説明】
第１図は、この発明の実施の形態１による気中遮断器の要部縦断面図である。
第２図は、実施の形態１の磁性板の函体への取り付け配設を説明する図である。
第３図は、実施の形態２の開閉接点部の周囲に設けられた磁性板の配置を示した図である。
第４図は、実施の形態３の磁性板および遮弊材の配置を示した図である。
第５図は、従来の気中遮断器の要部側断面図である。
第６図は、従来の気中遮断器の開閉接点部の要部斜視図である。
第７図は、従来の気中遮断器の開閉接点部の周囲に設けられた磁性部材の配置を示した図である。TECHNICAL FIELD The present invention relates to a multipolar air circuit breaker for interrupting an excessive current, and more particularly to securing a short-time conduction capacity at a switching contact portion.
BACKGROUND ART FIG. 5 is a sectional side view of a main part of a conventional air circuit breaker disclosed in, for example, Japanese Patent Application Laid-Open No. 6-089650, and FIG. FIG. 7 is a view showing the arrangement of a magnetic member provided around a switching contact portion of a conventional air circuit breaker.
In the figure, reference numeral 1 denotes an outer shell of an air circuit breaker, and 2 denotes an opening / closing mechanism including a well-known toggle link. Since such an air circuit breaker requires a large throwing power, it is turned on by the charge handle 2a or a motor (not shown) by the spring force accumulated in the closing spring 2d by the ratchet 2b and the eccentric cam 2c. I have.
A contact arm 4 is connected to a lower link 2 e of the opening and closing mechanism 2 via a connecting pin 3, and the contact arm 4 is rotatably supported by a contact arm pin 5. Reference numeral 6 denotes a movable contact, to which a movable contact 6a is fixed at one end, and a flexible conductor 7 formed by laminating thin conductors is connected to the other end. The 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 connection position of the lower terminal 8. Further, the movable contact pin 6c is inserted through a fulcrum hole 6b provided near the center of the movable contact 6 and a support hole of the contact arm 4, and the movable contact 6 is swingably supported. Reference numeral 9 denotes an upper terminal, which is provided at one end with a fixed contact 9a which comes into contact with and separates from the movable contact 6a. Reference numeral 10 denotes a contact pressure spring, which urges a connection portion with the movable contact 6 in a direction in which the U-shaped flexible conductor 7 is opened. This biasing force acts on the movable contact 6 clockwise in the drawing with the movable contact pin 6c as a lever fulcrum, and brings the movable contact 6a into contact pressure with the fixed contact 9a. An arc extinguishing device 11 extinguishes an arc generated between the contacts when the current is interrupted. Reference numeral 12 denotes a magnetic plate disposed between the pole phases. The magnetic plate 12 is disposed so as to cover the U-shaped side portion of the flexible conductor 7, and serves as a magnetic path for strengthening an electromagnetic force for suppressing floating of the movable contact 6a when an excessive current described later is supplied. ing.
Next, the contact pressing operation of the conventional air circuit breaker at the time of a fault current will be described. When an excessive fault current is supplied to the air circuit breaker, the movable contact 6a normally pressed to the fixed contact 9a by the contact pressure spring 10 tends to be opened by an electromagnetic repulsive force. Since the excessive current passes through the flexible conductor 7, the electromagnetic force acts on the flexible conductor 7 in a direction to open the U-shape. Even if the excessive current passes, the floating of the contact does not occur, and the flexible conductor 7 is short-circuited without firing between the contacts. The time conduction capacity is increased.
However, the excessive fault current at the time of a load short circuit interrupted by such an air circuit breaker is three-phase alternating current, and passes through three poles simultaneously. Therefore, magnetic fluxes having a phase shift of 120 degrees simultaneously pass through the magnetic plate 12 disposed between the phases. For this reason, when the breaking current increases, the magnetic plate 12 is magnetically saturated in the in-phase region with the adjacent pole of the current, and the magnetic flux is canceled in the opposite-phase region, and the electromagnetic force (contact pressing force) for opening the U-shaped flexible conductor 7 is increased. It does not increase as compared with the increase in the current value, and the separating electromagnetic repulsive force between the fixed contact 9a and the movable contact 6a excels, so that the contact is easily lifted. Therefore, even if the thickness of the magnetic plate 12 is increased, the effect of preventing the contact from being lifted as expected cannot be obtained.
Further, since the magnetic plate 12 is disposed only around the flexible conductor 7, the movable contact 6 is affected by the magnetic field of the adjacent pole and receives a lateral force due to the electromagnetic force with the current of the own pole. This lateral force causes the movable contact 6a to move in the lateral direction, causing an arc between the movable contact 6a and the fixed contact 9a, and there is a problem that the contact capacity is not increased for a short time due to damage to the contact surface.
The present invention has been made in order to solve such a problem, and suppresses the influence of the magnetic flux of the adjacent pole even if the fault current increases, suppresses the floating of the fixed contact 9a and the movable contact 6a, and suppresses the lateral movement of the contact. It is an object of the present invention to obtain an air circuit breaker that suppresses displacement, makes it difficult for the contact surface to be ignited, and has a high current carrying capacity in a short time.
DISCLOSURE OF THE INVENTION An air circuit breaker according to the present invention is a flexible conductor formed by bending a movable contact having a movable contact among open / close contacts in an opening / closing direction so as to be capable of opening / closing and a substantially U-shape; A support shaft for leverage, which converts the electromagnetic force of the U-shaped portion of the conductor in the expanding direction to the pressing force of the movable contact, and a magnetic plate, which is disposed between the U-shaped side poles of the flexible conductor, for enhancing the electromagnetic force, are arranged in parallel. A plurality of sheets are arranged and a magnetic gap is interposed therebetween.
Further, the magnetic plate between the poles extends from the U-shaped side surface of the flexible conductor to the side of the switching contact.
A magnetic plate is inserted and arranged in an insertion groove formed with a gap corresponding to a magnetic gap in a phase gap wall that insulates and separates the multi-pole switching contact. It is divided into a magnetic shielding plate of an open / close contact portion including a movable side contact and a V-shaped side arrangement, and each of the arranged insertion grooves is independently provided on a phase separation wall.
Further, each magnetic plate and each magnetic shielding plate are constituted by a laminated body of magnetic thin plates.
BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1
FIG. 1 is a longitudinal sectional view of a main part of an air circuit breaker according to Embodiment 1 of the present invention,
FIG. 2 is a diagram for explaining how the magnetic plate of the first embodiment is attached to a box and disposed.
In the figure, reference numerals 1 to 11 are the same as those in the description of the conventional apparatus, and the description is omitted. Reference numeral 13 denotes a magnetic plate, which is disposed on the U-shaped side of the flexible conductor 7. The magnetic plate 13 is provided between the poles of the multi-pole opening / closing section and is made up of a plurality of magnetic plates, with a magnetic gap 13a between the plates.
As shown in FIG. 2, the magnetic plate 13 is a box formed of an insulating resin material forming the outer shell 1 of the air circuit breaker. It is attached to a predetermined position by inserting. The insertion groove 1b is provided in parallel with the central portion of the phase space wall 1a of the insulating resin material of the base molding material as the magnetic gap 13a so that the plurality of magnetic plates 13 can be mounted in parallel while securing the magnetic gap 13a. I have.
In the air circuit breaker thus configured, the magnetic flux due to the current of the own pole and the magnetic flux due to the adjacent pole current are separated by the magnetic air gap 13a, and are a current having a phase difference for each pole by the plurality of magnetic plates 13. Also, since magnetic saturation and magnetic flux cancellation are reduced, the electromagnetic force (contact pressing force) for opening the U-shape of the flexible conductor 7 easily increases in proportion to the magnitude of the current, and the contacts due to electromagnetic repulsion between the contacts Lifting can be suppressed.
Therefore, the contact capacity does not rise when an excessive current is applied, so that the current carrying capacity can be increased for a short time.
Embodiment 2 FIG.
FIG. 3 is a diagram illustrating an arrangement of a magnetic plate provided around a switching contact portion according to the second embodiment. In the figure, 1, 6 to 9 are the same as those in the first embodiment. Reference numeral 14 denotes a plurality of magnetic plates. In the second embodiment, each magnetic plate 14 extends from the U-shaped side of the flexible conductor 7 to the side of the switching contact. The plurality of magnetic plates 14 are mounted and arranged by being inserted into insertion grooves (not numbered) provided in parallel with the magnetic gaps 13a provided in the phase space walls 1a.
By arranging the magnetic plate 14 on the side of the switching contact including the movable contact 6 as described above, the magnetic plate 14 shields the circulating magnetic flux caused by the current of the adjacent pole, so that the movable contact 6 has its own current. To prevent lateral displacement due to the electromagnetic force of the magnetic flux of the adjacent pole.
Therefore, in addition to suppressing an increase in the electromagnetic force (contact pressing force) for opening the U-shaped flexible conductor 7 described in the first embodiment, the lateral displacement of the movable contact 6 can be suppressed, and further shortening can be achieved. The time current carrying capacity can be increased.
Embodiment 3 FIG.
FIG. 4 is a diagram showing an arrangement of a magnetic plate provided around a switching contact portion according to the third embodiment. In the figure, 1, 6 to 9 and 13 are the same as those in the first embodiment. Reference numeral 15 denotes a magnetic shielding plate, which is provided between the pole phases on the side of the contact opening / closing portion of the movable contact 6 and the movable contact 6a and the fixed contact 9a separately from the magnetic plate 13. A reinforcing portion 1c is provided between the magnetic plate 13 and the magnetic shielding plate 15.
In the second embodiment, a long insertion groove extending from the U-shaped side portion of the flexible conductor 7 to the side portion of the contact opening / closing portion is provided in the phase interval wall 1a, and the magnetic plate 14 is inserted and arranged in this groove. For this reason, a strong electromagnetic force applied to the magnetic plate 14 may cause cracks in the side wall of the insertion groove. As a countermeasure, thickening the phase separation wall 1a increases the volume of the air circuit breaker, which is not desirable. In view of this, the magnetic plate 13 is divided so as to secure a magnetic path and the magnetic shield plate 15 is provided with the function of shielding the adjacent poles. With the thickness of 1a, the insertion grooves of the magnetic plate 13 and the magnetic shielding plate 15 are made independent from each other, and the reinforcing portion 1c is provided to prevent the cracks in the phase space wall 1a. Then, the box 1 is formed integrally with the phase separation wall 1a by molding a dielectric resin. The location of the reinforcing portion 1c is effective as a contact position of the ejector pin when removing the box 1 from the molding die.
In the above description, the magnetic shielding plate 15 is also a plurality of magnetic shielding plates 13a. However, the reinforcing plate 1c is provided in order to secure the strength of the phase separation wall 1a. 15 may be a single sheet.
Embodiment 4 FIG.
Next, arranging the magnetic plates 13 and 14 and the magnetic shielding plate 15 in a plural number with the magnetic gap 13a therebetween eliminates the influence of the magnetic flux of the adjacent pole, but the eddy current due to the circulating magnetic flux of the own pole has the magnetic gap. The heat generation of the magnetic plates 13, 14 and the magnetic shield plate 15 due to eddy current loss in the normal rated current range causes energy loss and the temperature of the air circuit breaker. It causes rise.
As a countermeasure, by forming the magnetic plates 13 and 14 and the magnetic shielding plate 15 in which magnetic thin plates whose surfaces are weakly insulated are laminated, eddy current loss can be reduced and heat generation can be suppressed.
INDUSTRIAL APPLICABILITY As described above, in the air circuit breaker of the present invention, the magnetic air gap 13a separates the magnetic flux due to the current of the self-pole and the magnetic flux due to the current of the adjacent pole, and there is a phase difference for each pole. Even with current, magnetic saturation and magnetic flux cancellation in the magnetic plate 13 are reduced, so that the electromagnetic force (contact pressure) for opening the U-shaped flexible conductor 7 increases in proportion to the magnitude of the current, Suppresses contact floating due to electromagnetic repulsion between contacts. Further, the magnetic shield plate 14 provided between the movable contact 6a and the fixed contact 9a at the contact opening / closing portion shields the circulating magnetic flux due to the current of the adjacent pole, and the movable contact 6 is moved laterally by the electromagnetic force of its own current. Prevent displacement.
Therefore, when an excessive current is applied, the contact is not lifted or shifted laterally, so that the current carrying capacity is increased for a short time.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a main part of an air circuit breaker according to Embodiment 1 of the present invention.
FIG. 2 is a diagram for explaining how the magnetic plate of the first embodiment is attached to a box.
FIG. 3 is a diagram showing an arrangement of a magnetic plate provided around a switching contact portion according to the second embodiment.
FIG. 4 is a diagram showing an arrangement of a magnetic plate and a shielding material according to the third embodiment.
FIG. 5 is a side sectional view of a main part of a conventional air circuit breaker.
FIG. 6 is a perspective view of a main part of a switching contact portion of a conventional air circuit breaker.
FIG. 7 is a diagram showing an arrangement of magnetic members provided around a switching contact portion of a conventional air circuit breaker.

Claims (5)

固定接点と可動接点からなる多極の開閉接点と、上記可動接点を有する可動接触子を開閉可能に開閉方向に屈曲し略Ｕ字形に整形した可撓導体と、上記可撓導体の通電電流による上記Ｕ字形の開拡方向の電磁力を上記可動接点の押圧力に変換する梃子作用の支軸と、上記電磁力を強化する上記可撓導体のＵ字形の側面極間に配置した磁性板と、この磁性板を並列配置複数枚にしてその間に磁気空隙を介在させたことを特徴とする気中遮断器。A multi-pole open / close contact comprising a fixed contact and a movable contact; a flexible conductor which is formed in a substantially U-shape by bending a movable contact having the movable contact in an opening / closing direction so as to be capable of opening / closing; A lever shaft for converting the electromagnetic force in the U-shaped expanding direction into a pressing force of the movable contact, and a magnetic plate disposed between U-shaped side poles of the flexible conductor for enhancing the electromagnetic force; An air circuit breaker comprising a plurality of magnetic plates arranged in parallel and a magnetic gap interposed therebetween. 上記磁性板を多極の開閉接点の極間にまで延在させたことを特徴とする請求項１記載の気中遮断器。2. The air circuit breaker according to claim 1, wherein the magnetic plate extends to between the poles of the multi-pole switching contact. 気中遮断器の外殻を形成する絶縁樹脂製の函体に設けた多極の開閉接点を絶縁隔離する相間隔壁と、この相間壁に磁気空隙相当の空隙をもって穿設された挿入溝に磁性板を挿入配設したことを特徴とする請求項１または２記載の気中遮断器。A phase gap wall is provided on the insulating resin box that forms the outer shell of the air circuit breaker to insulate and isolate the multipole switching contacts, and an insertion groove is formed in this phase wall with a gap equivalent to a magnetic gap. 3. The air circuit breaker according to claim 1, wherein a plate is inserted and disposed. 可撓導体のＵ字形側面配置の磁性板と、可動接触子を含む開閉接点部の遮磁板に分割して、相間隔壁に各個の配設挿入溝を独立して設けたことを特徴とする請求項２または３記載の気中遮断器。It is characterized in that it is divided into a magnetic plate of a U-shaped side surface arrangement of a flexible conductor and a magnetic shield plate of an on / off contact portion including a movable contact, and each of the arrangement insertion grooves is independently provided on a phase space wall. The air circuit breaker according to claim 2 or 3. 磁性板及び各遮磁板を磁性薄板の積層体で構成したことを特徴とする請求項１乃至４のいずれかに記載の気中遮断器。The air circuit breaker according to any one of claims 1 to 4, wherein the magnetic plate and each of the magnetic shielding plates are formed of a laminate of magnetic thin plates.
JP2002580697A 2001-08-02 2001-08-02 Air circuit breaker Expired - Fee Related JP4599799B2 (en)

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JP4395134B2 (en) * 2004-01-28 2010-01-06 三菱電機株式会社 Breaker
WO2007010608A1 (en) * 2005-07-21 2007-01-25 Mitsubishi Denki Kabushiki Kaisha Breaker
WO2009122584A1 (en) * 2008-04-04 2009-10-08 三菱電機株式会社 Short circuit detection apparatus for circuit breaker
FR2947667A1 (en) * 2009-07-01 2011-01-07 Schneider Electric Ind Sas ASSISTANCE THROUGH MAGNETIC COMPENSATION DEVICE FOR REPULSION FORCES AND CONTACTOR COMPRISING SUCH A DEVICE
KR101168533B1 (en) * 2011-03-14 2012-07-27 엘에스산전 주식회사 Grounding switch
CN112635263B (en) * 2020-12-30 2022-09-13 滁州博杰科技有限公司 Electromagnetic auxiliary circuit breaker

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TW517257B (en) 2003-01-11

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