JP3721266B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
JP3721266B2
JP3721266B2 JP22009498A JP22009498A JP3721266B2 JP 3721266 B2 JP3721266 B2 JP 3721266B2 JP 22009498 A JP22009498 A JP 22009498A JP 22009498 A JP22009498 A JP 22009498A JP 3721266 B2 JP3721266 B2 JP 3721266B2
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Japan
Prior art keywords
movable contact
side fixed
fixed contact
load side
power supply
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Expired - Fee Related
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JP22009498A
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Japanese (ja)
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JP2000057930A (en
Inventor
幸英 山田
俊広 関口
和哉 藍原
栄悦 佐藤
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Hitachi Industrial Equipment Systems Co Ltd
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Hitachi Industrial Equipment Systems Co Ltd
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Priority to JP22009498A priority Critical patent/JP3721266B2/en
Priority to EP19990305863 priority patent/EP0978858B1/en
Priority to DE1999630795 priority patent/DE69930795T2/en
Priority to EP05015106A priority patent/EP1600988A3/en
Publication of JP2000057930A publication Critical patent/JP2000057930A/en
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Publication of JP3721266B2 publication Critical patent/JP3721266B2/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00Protective 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
    • H01H73/02Details
    • H01H73/04Contacts
    • H01H73/045Bridging contacts
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/18Contacts characterised by the manner in which co-operating contacts engage by abutting with subsequent sliding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2016Bridging contacts in which the two contact pairs commutate at substantially different moments
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2041Rotating bridge
    • H01H1/205Details concerning the elastic mounting of the rotating bridge in the rotor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00Contacts
    • H01H1/12Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20Bridging contacts
    • H01H1/2041Rotating bridge
    • H01H1/2058Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/24Electromagnetic mechanisms
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/24Electromagnetic mechanisms
    • H01H71/2472Electromagnetic mechanisms with rotatable armatures
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02Bases, casings, or covers
    • H01H9/0264Protective covers for terminals
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/342Venting arrangements for arc chutes

Landscapes

  • Breakers (AREA)

Description

【0001】
【発明に属する技術分野】
本発明は、回路遮断器に関し、特に接点閉成時における接点の適正なワイプを得るのに好適な接点を有する回路遮断器に関する。
【0002】
【従来の技術】
回路遮断器は、送配電線や変電所母線・機器等の短絡故障時にその回路を自動遮断するための開閉器であるが、平常時は回路の開閉にも用いられている。
【0003】
従来の回路遮断器は、例えば特開平6−52777号公報に開示されているように、接点ブリッジ(可動接点台)に設けられた1対の可動接点と、これら可動接点のそれぞれに対向して設けられた固定接点を有している。これらの可動接点と固定接点の組は可動接点台の回転中心に関して点対称位置に配置され、これらの可動接点と固定接点の組は実質的に同時に閉成するよう構成されていた。また、従来の回路遮断器は特開平6−325680号公報に開示されているように接点部分のユニットと引外し機構を含むユニットが別々に構成され、それらをねじどめで接続することにより回路遮断器を組み立てていた。さらにまた、従来の回路遮断器は特公平7−123021号公報に開示されているように、引外し機構の電磁力を機械的出力に変換する部分も充電部であった。
【0004】
【発明が解決しようとする課題】
従来技術における可動接点と固定接点の組はそれぞれ固定接点に可動接点が当接した位置で可動接点台の動きが停止してしまうため接点の表面同士がほとんど摺動することなく、そのため接点の表面に酸化被膜等ができやすいという問題があった。また、従来技術では、接点部分と引外し機構部分とが別々に製作されて筐体への組み込み時点で初めて両者が接続されるため、組立時にねじ止め等の工数がかかるとともに、組立後でないと動作チェックができないという問題があった。さらにまた、従来技術の引外し機構は電磁力を機械的出力に変換する部分も充電部であったため、保守点検等で不用意にさわってしまうと感電事故につながるおそれがあった。
【0005】
本発明の目的は、可動接点台のワイプを確実に得られて安定した遮断性能を有する回路遮断器を提供することにある。
【0006】
また、本発明の目的は、組立時の作業性に優れた回路遮断器を提供することにある。
【0007】
本発明の他の目的は、引外し機構の電磁力を機械的出力に変換する変換機構部を主回路からも電気的に絶縁することにより安全性の高い回路遮断器を提供することにある。
【0008】
【課題を解決するための手段】
本願の第1の発明は、電源側固定接点台、電源側固定接点、電源側可動接点、可動接点台、負荷側可動接点、負荷側固定接点及び負荷側固定接点台を有する主回路と、可動接点台を回動させることにより主回路を開閉する開閉機構部と、主回路の電流が異常状態となったときに開閉機構部を引き外す引外し機構部と、可動接点台を回動自在に保持する可動接点台ホルダと、この可動接点台ホルダを回動自在に保持する保持手段と、開閉機構部の開閉動作を可動接点台ホルダに伝達する伝達手段を備えた回路遮断器において、主回路は電源側固定接点台および負荷側固定接点台を流れる電流の向きと可動接点台を流れる電流の向きとが逆になって電磁反発力を発生するよう配設され、主回路の閉成時に電源側固定接点と電源側可動接点間のワイプ量と、負荷側可動接点と負荷側固定接点間のワイプ量とが異なるよう構成されたことを特徴とするものである。
【0009】
好ましい実施態様においては、主回路の閉成時に電源側固定接点と電源側可動接点間のワイプ量が、負荷側可動接点と負荷側固定接点間のワイプ量より小さくなるよう構成されたことを特徴とする。
【0010】
また、本願の第2の発明は、電源側固定接点台、電源側固定接点、電源側可動接点、可動接点台、負荷側可動接点、負荷側固定接点及び負荷側固定接点台を有する主回路と、可動接点台を回動させることにより主回路を開閉する開閉機構部と、主回路の電流が異常状態となったときに開閉機構部を引き外す引外し機構部と、可動接点台を回動自在に保持する可動接点台ホルダと、この可動接点台ホルダを回動自在に保持する保持手段と、開閉機構部の開閉動作を可動接点台ホルダに伝達する伝達手段を備えた回路遮断器において、主回路は電源側固定接点台および負荷側固定接点台を流れる電流の向きと可動接点台を流れる電流の向きとが逆になって電磁反発力を発生するよう配設され、主回路がOFF状態からON状態に移行するときに電源側固定接点と電源側可動接点の組および負荷側可動接点と負荷側固定接点の組のいずれか一方の組が閉成したときに他方の組の接点間には間隙が形成されているよう構成されたことを特徴とするものである。
【0020】
【発明の実施の形態】
本発明の発明の実施の形態を説明する。
本発明の回路遮断器の一実施例について、図1〜図18を用いて説明する。
本実施例は3極の回路遮断器に本発明を適用したものである。
本実施例の回路遮断器は、図1、図2に示されるように、カバー40a及びケース40bを有する筐体40内に、各極に電源側固定接点台1、電源側固定接点2、電源側可動接点3、可動接点台4、負荷側可動接点5、負荷側固定接点6及び負荷側固定接点台7を有する主回路100と、この主回路100に電気的に接続された電源側端子1aおよび負荷側端子7cとを備えている。
図1、図5、図10に示されるように、電源側固定接点台1と負荷側固定接点台7は、回動自在に保持された可動接点台4の回転中心に対して実質的に点対称位置に設けられている。電源側固定接点台1は、電源側可動接点3と対向する位置に電源側固定接点2を有し、負荷側固定接点台7は負荷側可動接点5と対向する位置に負荷側固定接点6を有している。
可動接点台4は、その回転中心に対して点対称位置にそれぞれ電源側可動接点3、負荷側可動接点5を有している。可動接点台4は可動接点台ホルダ20に回動自在に保持され、この可動接点台ホルダ20は保持手段80により回動自在に保持される。主回路100の少なくとも電源側固定接点2から可動接点台4を介して負荷側固定接点6に至る部分と可動接点台ホルダ20と保持手段80とは格納手段としての主回路ケース22の内部に格納されてユニット90を構成している。本実施例では、保持手段80は絶縁物により形成された主回路ケース22に一体に形成されている。本実施例ではさらに主回路100の電流が異常状態となったときに動作して機械的出力を発生する引外し機構部50が、図9に示すように、負荷側固定接点台7の負荷側固定接点6が固着される端部7aと反対側の端部7bに負荷側端子7cとともに一体に固着されている。
【0021】
主回路ケース22はその外部に引外し機構部50の装着部22aを有し、各ユニット90は電源側端子1aと負荷側端子7cと引外し機構部50とが主回路ケース22の外部に配設された状態で、図2に示すように3極分の可動接点台ホルダ20の回転軸が実質的に同一直線上になるように並設される。ここで言う「実質的に」とは許容される範囲内での位置のずれあるいは角度のずれを有するものも含むということである。なお、図2において、電源側端子1aを上にして見たとき一番左側の極はユニット90内の主回路100を示しており、主回路ケース22,引外し機構部50の図示は省略されている。
【0022】
本実施例の引き外し機構部50は図9に示すように負荷側固定接点台7と負荷側端子7cとの間に接続されたコイル52と、このコイル52の内部に設けられた固定コアとしての筒状のオイルダッシュポット53と、L字形に形成されてL字の水平な辺54hにこのオイルダッシュポット53が固着される継鉄54と、この継鉄54のL字の垂直な辺54vの端部に回動自在に係止されてコイル52が励磁されたときにオイルダッシュポット53に吸引されて磁気回路のループを形成する可動コア55と、可動コア55をオイルダッシュポット53から離間させる方向に付勢するばね56を有している。すなわち、本実施例では、主回路100に異常電流が流れた時にこのコイル52に発生する電磁力を機械的出力に変換する変換機構部51はオイルダッシュポット53と、継鉄54と、可動コア55とばね56により構成されている。
【0023】
図6に示されるように、負荷側固定接点台7にはコイル52の軸方向の長さよりも長い立ち上がり寸法を有する立ち上がり部7dが形成されている。本実施例ではオイルダッシュポット53の頂部53aの径はコイル52の内径より大きく形成されているため、オイルダッシュポット53にコイル52を先に嵌挿しておき、その後オイルダッシュポット53の端部53bに継鉄54がろうづけ等により固着される。この状態でコイル52はオイルダッシュポット53が内部に設けられたまま、負荷側固定接点台7の立ち上がり部7dと負荷側端子7cの立ち上がり部7eに接続される。この立ち上がり部7dの上端部にはコイル52の一方の端部、すなわち、巻始め端あるいは巻終わり端のいずれか一方、がろうづけ等により電気的接続を有するよう固着される。一方負荷側端子7cにも立ち上がり部7eが形成され、この立ち上がり部7eの上部にはコイル52の他方の端部、すなわち、巻終わり端あるいは巻始め端、がろうづけ等により電気的接続を有するよう固着される。これにより、負荷側固定接点台7と負荷側端子7cとがコイル52を介して一体に接続される。可動コア55、ばね56はこの後継鉄54に装着され、図9に示される組立品となる。図6および図9に示される組立品は、この負荷側固定接点台7とコイル52と負荷側端子7cとが一体化されているので、形状が安定で負荷側固定接点台7とコイル52と負荷側端子7cとの位置関係が一定しており、ケース40b内に組込むときに、産業用ロボット等で取り扱うのが容易となる。なお、図7は図6の組立品をオイルダッシュポット53の頂部53aの側から見た図、図8は図6の組立品をオイルダッシュポット53の底部53c側から見た図である。
【0024】
図8に示されるように、負荷側固定接点台7にはオイルダッシュポット53の底部53cが貫通する孔7fが形成される。この孔7fはオイルダッシュポット53の直径に対して十分に大きく形成される。この十分に大きくとは、孔7fの直径とオイルダッシュポット53の直径とが、オイルダッシュポット53が取り付けられたときに寸法公差等によりオイルダッシュポット53が多少ずれても負荷側固定接点台7と非接触で電気的な絶縁距離を維持できる寸法差を有しているということである。さらに、オイルダッシュポット53のコイル52に対向する外周面には絶縁物58が巻回され、オイルダッシュポット53は主回路100から電気的に絶縁される。
オイルダッシュポット53は端部53bがL字形の継鉄54にろう付け等により固着され、継鉄54には可動コア55が回動自在に係止される。可動コア55はばね56により付勢されて通常はオイルダッシュポット53の頂部53aから離間した位置にある。コイル52が励磁されるとオイルダッシュポット53の磁気吸引力がばね56の付勢力に打ち勝って可動コア55がオイルダッシュポット53の頂部53aに吸引されて接触し、オイルダッシュポット53−オイルダッシュポット53の端部53b−継鉄54−可動コア55−オイルダッシュポット53の頂部53a−オイルダッシュポット53という磁気回路のループを形成する。継鉄54は主回路ケース22の外部に形成された引外し機構部50の装着部22aに装着され、主回路100から電気的に絶縁された状態で保持される。これにより引外し機構部50の引外しのための機械的出力を発生する部分、すなわち、図10に示すように、変換機構部51はコイル52及び主回路100のいずれからも電気的に絶縁された状態で格納手段の装着部22aに装着され、保守・点検時の安全性を高めることができる。また、各極毎に電源側端子1aから負荷側端子7cに至る主回路100と引外し機構部50を含む部分が一体化されてユニット90が構成されるため、複数極の回路遮断器を得るにはユニット90を必要な極数(本実施例では3極)分だけ組み合わせればよく、組立時の作業性が大幅に向上するとともに優れた生産性を得ることができる。
【0025】
この3極のユニットの内の中央の極のユニット90の外側には開閉機構部30が装着される。開閉機構部30は、図14、図15に示すように、フレーム30w内に、ハンドル60が装着されるレバー30t、トグルリンクを構成する上リンク30c及び下リンク30b、定格電流の範囲内での通常のON状態・OFF状態時(以下通常時)にトグルリンクを直線状態に保つフック30d、通常時にフック30dを係止する引外し金具30h、引外し金具30hを回動自在に軸止するピン30g、引外し機構部50の動作を伝達する共通引外し軸30a、共通引外し軸30aの動きを引外し金具30hに伝達するトリップ金具30e、トリップ金具30eを回動自在に軸止するピン30f、通常時のON。OFF動作および引外し時にレバー30tとトグルリンク30および30cを付勢する付勢ばね30sが装着されて構成されている。共通引外し軸30aは本実施例では3極の引外し機構部50のいずれが動作してもその動作をトリップ金具に伝達できるように3極分のユニット90にわたってユニット90の上面とほぼ並行して延びている。可動接点台4は、可動接点台ホルダ20と連結部材25を介して開閉機構部30の下リンク30bに機械的に接続される。主回路100の開閉は可動接点台4を回動させることにより行われる。通常の手動による開閉操作では、開閉機構30がハンドル60によりON操作あるいはOFF操作される。開閉機構30がON操作されると下リンク30bの動作により電源側固定接点台1と負荷側固定接点台7とを電気的に接続する位置まで接点ホルダ20が回転する。これにより主回路100は閉成される。3極のユニット90の間には各極の可動接点台ホルダ20を同時に回転させて、各極の接点の開閉を同時に行わせる連結部材25が設けられる。なお、ここで言う「同時」とは完全に同じタイミングだけではなく、許容される範囲内での時間差を有する場合も含むものである。一方、開閉機構30がOFF操作されると下リンク30bの動作により電源側固定接点台1と負荷側固定接点台7とが電気的に切り離される位置まで各極の可動接点台ホルダ20が同時に回転する。これにより主回路100は開離される。
【0026】
短絡あるいは過負荷等により定格電流より大きい異常電流が流れたときには引外し機構部50が動作して開閉機構30に引外し動作を行わせる。各極の引外し機構部50は共通引外し軸30aを介して開閉機構部30にその動作を伝達できる位置に配設されて複数極の内少なくとも1つの極の主回路の電流が異常状態となったときに開閉機構部30を引き外すよう構成される。引外しが行われると、各極の可動接点台ホルダ20が電源側固定接点台1と負荷側固定接点台7とが電気的に切り離される位置まで同時に回転し、主回路100を開離させることにより回路を遮断する。
【0027】
図10に示されるように、各ユニット90の主回路ケース22の底面には位置決め用の凹部22gと凸部22hが形成されている。一方、図1に示されるように、ケース40b内面の底部には凹部22gと係合する突起40gと凸部22hに係合する凹部40hが形成されている。また、電源側端子1a、負荷側端子7cにはそれぞれねじ孔1n、7nが形成されている。極数分(本実施例では3極分)のユニット90はその内の1極(本実施例では中央の極)に開閉機構部30が装着された状態で連結部材25を介して接続され、この状態でケース40b内にこのケース40bの開口している側から底部に向かって挿入される。挿入終了状態では図1に示されるように、ユニット90の位置決め用の凹部22gと凸部22hとがそれぞれケース40b内面底部の突起40gと凹部40hとに係合し、主回路100の延びる方向(電源側端子から負荷側端子に向かう方向)の動き、あるいは位置ずれを規制する。一方、図2に示されるように、主回路100の延びる方向と直交する方向の動きあるいは位置ずれはケース40bの両側面の側壁40s、各極間に形成された隔壁40kにより規制される。これにより、ユニット90をケース40b内に組み込むときの位置決めが容易にでき、組立作業性が向上する。さらに、図1に示されるように、各極のユニット90は、ねじ孔1n、7nにねじ44がケース40bの底面側から装着されねじ止めされることにより、ケース40bにねじ止めで固着される。これによりユニット90のケース40bの底部から開口している側に向かう方向の動きを規制あるいは防止できる。また、同時に各ユニット90の主回路100の延びる方向および主回路100の延びる方向と直交する方向の位置が固定される。本実施例では各極あたり2カ所のねじ止めでユニット90をケース40b内に固定でき、組立工数を大幅に低減できる。また、組立作業を落とし込み作業とすることができるので、産業用ロボット等を用いた自動組立が可能となる。
【0028】
さらに、従来の回路遮断器では開閉機構等を筐体のケース底面のねじ止め孔からねじ止めにより固定していた。従来は開閉機構も充電部となるのでこのねじを絶縁することが必要であり、ケースの底面に絶縁性の覆いを設けて絶縁していた。そのためケース底面が二重構造となり、寸法の大型化、重量の増大、組立工数の増大を招いていた。
本実施例では、回路遮断器は、電源側端子1aから開閉可能な接点部分、すなわち、電源側固定接点2、電源側可動接点3、負荷側可動接点5、負荷側固定接点6を介して負荷側端子7cに至る主回路100と、接点部分2,3,5,6を開閉する開閉機構部30と、この主回路100の電流が異常状態となったときに開閉機構部30を引き外すための機械的出力を発生する引外し機構部50と、絶縁物により形成されて主回路100の少なくとも接点部分2,3,5,6をその内部に格納する格納手段22と、絶縁物により形成されて主回路100と開閉機構部30と引外し機構部50と格納手段22を格納するよう構成された筐体40を備えている。格納手段22に引外し機構部50が一体化されてユニット90が構成され、中央の極のユニット90にはさらに開閉機構部30が装着される。電源側端子1a及び負荷側端子7cは格納手段22から突出するよう配設されており、電源側端子1a及び負荷側端子7cは筐体40のケース40b端部の端子取付部にねじ止め固定することによりユニットが筐体40内に固定される。
本実施例では端子部分のねじ止めだけで各ユニット90をケース40bに固定できるのでケース底面のねじ止め孔が不要になるとともにケース底面を二重にする必要がなく、筐体の寸法の小型化、軽量化がはかれる。さらに、ユニット90を固定するねじの本数が少なくて済み、組立工数の低減を図ることができる。本実施例ではケース40bのユニット90を収納する部分の底面にはねじ止め孔等の貫通部が存在せず、ケース40bの底面自体の絶縁物層で塞がれているので、ユニット90収納部分への塵埃や湿気の侵入を防止でき、信頼性の向上を図ることができる。また、底部がケース40bの底面自体の絶縁物層だけで構成されるため、ケース40b内部での発熱を底部を介して逃がすことができ、温度上昇を少なくすることができる。
【0029】
各ユニットにおいて、主回路は電源側固定接点台1および負荷側固定接点台7を流れる電流の向きと可動接点台4を流れる電流の向きとが逆になって電磁反発力を発生するよう配設されている。具体的には、図6〜図10に示されるように、電源側固定接点台1および負荷側固定接点台7には切り起こし部1k、7kが形成されてこの切り起こし部1k、7kの先端部にそれぞれ電源側固定接点2及び負荷側固定接点6が固着される。これによりこの切り起こし部1k、7kを流れる電流が可動接点台4を流れる電流と逆方向となり、短絡電流等の異常に大きい電流(定格電流の10倍以上)が流れたとき電源側固定接点台1および負荷側固定接点台7と可動接点台4との間に電磁反発力が発生して可動接点台4が反発開離するよう構成される。
【0030】
一方、通常のON・OFF動作の時には、主回路100の閉成時に電源側固定接点2と電源側可動接点3間のワイプ量と、負荷側可動接点5と負荷側固定接点6間のワイプ量とが異なるよう構成されている。一般に、回路遮断器等においては接点圧を得るため、あるいは接点表面の酸化被膜を除去して接触状態を良好に保つために、開閉機構部がONされると、開閉機構部は可動接点台を可動接点と固定接点が接触する位置を超える位置まで可動接点台を移動させようとする。このときに、固定接点及び固定接点台がなかった場合に可動接点が到達する位置と、固定接点及び固定接点台がある場合に可動接点と固定接点が接触する位置との距離をワイプという。本実施例では、図11に示すように、主回路100の閉成時に電源側固定接点2と電源側可動接点3間のワイプ量が、負荷側可動接点5と負荷側固定接点6間のワイプ量より小さくなるよう構成される。具体的には、図11(a)、(b)に示すように負荷側固定接点6と負荷側可動接点5のなす角が電源側固定接点2と電源側可動接点3のなす角より大きくなるように負荷側固定接点台7の切り起こし部7kの角度と電源側固定接点台1の切り起こし部1kの角度とがそれぞれ設定される。これにより、電源側固定接点2の電源側可動接点3に対向する面は負荷側固定接点6の負荷側可動接点5に対向する面を含む平面に平行な平面に対し所定の角度をなす平面に含まれるように電源側固定接点台1と負荷側固定接点台7とが形成される。そのため、図11(b)に示されるように、主回路がOFF状態からON状態に移行するときにおよび負荷側可動接点5と負荷側固定接点6の組が閉成したとき(接触したとき)に電源側固定接点2と電源側可動接点3の組の接点間には間隙Gが形成される。この状態から両方の接点の組が閉成されて主回路がON状態になるまで可動接点台4がさらに回動し負荷側可動接点5と負荷側固定接点6は摺動しながら接触を継続し、一方、電源側固定接点2と電源側可動接点3は接触した後接点ばねの力により摺動して電源側、負荷側ともON状態になる。従って、負荷側可動接点5と負荷側固定接点6間のワイプ量が電源側固定接点2と電源側可動接点3間のワイプ量より大きくなり、負荷側における接点の接触抵抗を小さくすることができる。
特に本実施例では負荷側固定接点台7と負荷側端子7cとの間にコイル52が介在しているため、負荷側固定接点6での発熱は電源側固定接点2に比べて放熱されにくい。一方、電源側固定接点2は電源側固定接点台1を介して電源側端子1aに接続されているので放熱されやすい。そのため、上記のように負荷側可動接点5と負荷側固定接点6間のワイプ量を電源側固定接点2と電源側可動接点3間のワイプ量より大きくして負荷側における接点の接触抵抗を小さくすることにより、負荷側固定接点6での発熱量を減少させることができ、接点の温度上昇を小さくすることができる。これにより、発熱が少なく安全性、信頼性に優れた回路遮断器を得られる。
【0031】
ワイプを得るにはこれに限ることはなく、図12あるいは図13に示される構成でもよい。図12は第1の変形例で、切り起こし部を設ける代わりに同図(b)に示すように電源側固定接点台1、負荷側固定接点台7の曲げ角度を変えるとともに可動接点台4の電源側可動接点3と負荷側可動接点5が平行線に対して所定の角度を持つように構成したものである。この変形例においても、主回路100がOFF状態からON状態に移行するときにおよび負荷側可動接点5と負荷側固定接点6の組が閉成したとき(接触したとき)に電源側固定接点2と電源側可動接点3の組の接点間には間隙Gが形成され、図11の場合と同様に、電源側固定接点2と電源側可動接点3間のワイプ量が、負荷側可動接点6と負荷側固定接点5間のワイプ量より小さくなる。
図13は第2の変形例で、第1の変形例と同様に切り起こし部を設ける代わりに同図(b)に示すように電源側固定接点台1、負荷側固定接点台7の曲げ角度を変えるとともに可動接点台4の電源側可動接点3と負荷側可動接点5が平行線に対して所定の角度を持つように構成したものである。この変形例では、負荷側固定接点6と負荷側可動接点5の組の接点間に間隙Gが形成され、負荷側可動接点5と負荷側固定接点6間のワイプ量が電源側固定接点2と電源側可動接点3間のワイプ量より小さくなる。この変形例は、電源側での発熱が大きい場合の対策として有効である。
これにより本実施例では負荷側、あるいは電源側で接触抵抗を減少させることができ、接点での発熱を減少させることができる。
【0032】
主回路ケース中の電源側固定接点台1、負荷側固定接点台7および可動接点台4の接点近傍には遮断時に発生するアークを吸引して冷却するアークシュート(消弧装置)24が設けられる。アークをさらに消弧装置24に効果的に導くため、本実施例では電源側固定接点台1、負荷側固定接点台7のそれぞれにアークホーン26が設けられている。本実施例では冷却されたアークガスを排出するアーク排出口22b、22cが主回路ケース22の電源側及び負荷側の双方に設けられている。電源側のアーク排出口22bは回路遮断器筺体40の表面側40c(操作ハンドル60が設けられる側)に向かって延び、筺体電源側端部の表面近傍に開口した電源側排出口40eに連通する。一方、負荷側のアーク排出口22cは主回路ケース22の端面の底面40d近傍に設けられ、筺体負荷側底部の負荷側アーク排出路40fに連通する。これにより、遮断動作が行われたときに電源側ではアークガスが表面40c側に噴出するので、電源側の端子1aと遮断器が取り付けられている取付板(図示せず。)(分電盤内では通常この取付板は電気的に接地されている。)との間にアークガス中の金属溶融物が付着するのが防止され、遮断後に地絡事故が発生するのを防止できる(電源側端子1aは主回路100が遮断されても電圧が印加されている)。一方、負荷側ではアークガスが筺体底部40dの負荷側アーク排出路40fを介して筺体40の負荷側端面の底面側に噴出する。そのため、引外し機構部50にアークガス中の金属溶融物が付着するのが防止されて信頼性が向上する。
【0033】
本実施例では、主回路100に短絡電流のような異常な大電流が流れたとき可動接点台4は電源側固定接点台1および負荷側固定接点台7に対して電磁反発力によりアークが切れる位置まで開離するよう構成されている。このとき、リバウンド、すなわち一度反発開離した可動接点台4が再び電源側固定接点台1および負荷側固定接点台7に接近して再びアークが発生して電流が流れ出す現象を防止するため、可動接点台ホルダ20には可動接点台4のロック機構が設けられている。本実施例ではこのロック機構として特願平10−118110号で出願された構成のものを用いている。すなわち、可動接点ホルダ20に可動接点台4等が装着された状態においては、図17に示すように可動接点台ホルダ20は第1のピン16により回動自在に軸支されたストッパ枠10と、このストッパ枠10に回動自在に軸支された第2のピン14とを有する。可動接点台4は第2のピン14と係合する係合部4Aを備え、可動接点台4が反発したときに第2のピン14が係合部4Aに係合してロックし、可動接点台4を反発位置に保持する。第1のピン16は図16に示すように可動接点台ホルダ20に開けられた孔20bに挿通され、ストッパ枠10の孔10dを貫通してストッパ枠10を可動接点台ホルダ20内に回動自在に保持する。図18に示すように、第1のピン16には溝16aが設けられ、ストッパ枠10を可動接点台ホルダ20内に回動自在に保持する状態でこの溝16aにEリング17が装着され抜け止めが行われる。ストッパ枠10は「U」字形断面を有しており、立ち上がり部10aには孔10dと孔10eとが設けられる。孔10dには第1のピン16が装着され、孔10eには第2のピン14が回動自在に装着される。また、「U」字の底辺にはばね8の一端を装着するための長円孔10bおよび半円状の切り欠き10cが設けられる。一方ばね8の他端は図5に示されるように可動接点台4の凹部4Bに係止される。この状態で短絡電流等の大電流が流れると、可動接点台4は反発開離し、反発終了後は図19に示すように可動接点台4が第2のピン14に係合したて保持され、リバウンドが防止される。そのため、本実施例では特願平10−118110号と同様に、反発終了後の係合状態では第2のピン14が係合部4Aをロックする力が増大し、リバウンドを確実に防止できて遮断性能に優れた回路遮断器を得ることができる。
【0034】
【発明の効果】
本発明によれば、可動接点台のワイプを確実に得られて安定した遮断性能を有する回路遮断器を得ることができる。
【0035】
また、本発明によれば、組立時の作業性に優れた回路遮断器を得ることができる。
【0036】
さらに、本発明によれば、引外し機構の電磁力を機械的出力に変換する変換機構部を主回路からも電気的に絶縁することにより安全性の高い回路遮断器を得ることができる。
【図面の簡単な説明】
【図1】本発明の一実施例における回路遮断器の構成を示す正面断面図である。
【図2】本発明の一実施例における回路遮断器のカバーを開けた状態を示す平面図である。
【図3】本発明の一実施例における回路遮断器の構成を示す平面図である。
【図4】本発明の一実施例における回路遮断器のユニットの接続状態を示す平面図である。
【図5】本発明の一実施例における回路遮断器のユニットの負荷側固定接点台取付前の状態を示す正面断面図である。
【図6】本発明の一実施例における回路遮断器の負荷側固定接点台にオイルダッシュポット、継鉄、コイルを取り付けた状態を示す正面図である。
【図7】本発明の一実施例における回路遮断器の負荷側固定接点台にオイルダッシュポット、継鉄、コイルを取り付けた状態を示す平面図である。
【図8】本発明の一実施例における回路遮断器の負荷側固定接点台にオイルダッシュポット、継鉄、コイルを取り付けた状態を示す底面図である。
【図9】本発明の一実施例における回路遮断器の負荷側固定接点台にオイルダッシュポット、継鉄、コイル、可動コアおよびばねを取り付けた状態を示す正面図である。
【図10】本発明の一実施例における回路遮断器のユニットの構造を示す正面断面図である。
【図11】本発明の一実施例における回路遮断器のワイプを発生させる構造を示す側面図で、同図(a)はギャップの形成状態を示す主要部の正面図、同図(b)はワイプ終了後の状態を示す正面図である。
【図12】本発明の一実施例における回路遮断器のワイプを発生させる構造の第1の変形例を示す正面図で、同図(a)はギャップの形成状態を示す主要部の側面図、同図(b)はワイプ終了後の状態を示す正面図である。
【図13】本発明の一実施例における回路遮断器のワイプを発生させる構造の第2の変形例を示す正面図で、同図(a)はギャップの形成状態を示す主要部の側面図、同図(b)はワイプ終了後の状態を示す正面図である。
【図14】本発明の一実施例における回路遮断器の開閉機構部の構成を示す正面断面図である。
【図15】本発明の一実施例における回路遮断器の開閉機構部の共通引外し軸の取付状態を示す側面図である。
【図16】本発明の一実施例における回路遮断器の可動接点ホルダの外形形状を示す正面図である。
【図17】本発明の一実施例における回路遮断器の可動接点ホルダの内部構成を示す正面断面図である。
【図18】本発明の一実施例における回路遮断器のストッパ枠の構成を示す分解斜視図である。
【図19】本発明の一実施例における回路遮断器の可動接点台の反発終了後のロック状態を示す正面断面図である。
【符号の説明】
1:電源側固定接点台、1a:電源側端子2:電源側固定接点、
3:電源側可動接点4:可動接点台、5:負荷側可動接点、
6:負荷側固定接点、7:負荷側固定接点台、7c:負荷側端子、
8:接点バネ、10:ストッパ枠、14:第1のピン、
16:第2のピン、20:可動接点台ホルダ、22:主回路ケース、
22a:装着部、25:連結部材、30:開閉機構部、
50:引外し機構部、52:コイル、53:オイルダッシュポット、
54:継鉄、55:可動コア、56:ばね、80:保持手段、
90:ユニット、100:主回路
[0001]
[Technical field belonging to the invention]
The present invention relates to a circuit breaker, and more particularly to a circuit breaker having a contact suitable for obtaining an appropriate wipe of the contact when the contact is closed.
[0002]
[Prior art]
A circuit breaker is a switch for automatically shutting off a circuit when a short circuit failure occurs in a transmission / distribution line, a substation bus, or a device.
[0003]
A conventional circuit breaker, for example, as disclosed in Japanese Patent Application Laid-Open No. 6-52777, faces a pair of movable contacts provided on a contact bridge (movable contact base) and each of these movable contacts. It has a fixed contact provided. These sets of movable contacts and fixed contacts are arranged at point-symmetrical positions with respect to the center of rotation of the movable contact base, and these sets of movable contacts and fixed contacts are configured to close substantially simultaneously. In addition, as disclosed in Japanese Patent Laid-Open No. 6-325680, a conventional circuit breaker has a contact portion unit and a unit including a tripping mechanism which are separately configured, and are connected by screwing. I was assembling the vessel. Furthermore, as disclosed in Japanese Examined Patent Publication No. 7-122301, the conventional circuit breaker also has a charging portion that converts the electromagnetic force of the tripping mechanism into a mechanical output.
[0004]
[Problems to be solved by the invention]
The pair of movable contact and fixed contact in the prior art stops the movement of the movable contact base at the position where the movable contact is in contact with the fixed contact, so the contact surfaces hardly slide with each other. However, there is a problem that an oxide film or the like is easily formed. In the prior art, since the contact portion and the trip mechanism portion are separately manufactured and are connected to each other only when they are assembled into the housing, it takes man-hours such as screwing at the time of assembly and is not after assembly. There was a problem that operation check was not possible. Furthermore, in the conventional tripping mechanism, the part that converts the electromagnetic force into the mechanical output is also a charging part. Therefore, if the touching mechanism is inadvertently touched during maintenance and inspection, an electric shock may occur.
[0005]
An object of the present invention is to provide a circuit breaker that can stably wipe the movable contact block and has a stable breaking performance.
[0006]
Another object of the present invention is to provide a circuit breaker excellent in workability during assembly.
[0007]
Another object of the present invention is to provide a circuit breaker with high safety by electrically isolating a conversion mechanism that converts the electromagnetic force of a tripping mechanism into a mechanical output from a main circuit.
[0008]
[Means for Solving the Problems]
A first invention of the present application includes a main circuit having a power source side fixed contact block, a power source side fixed contact, a power source side movable contact, a movable contact block, a load side movable contact, a load side fixed contact, and a load side fixed contact block, and a movable circuit An open / close mechanism that opens and closes the main circuit by rotating the contact base, a trip mechanism that pulls the open / close mechanism off when the current in the main circuit becomes abnormal, and a movable contact base that can rotate freely In a circuit breaker comprising a movable contact base holder to hold, a holding means for rotatably holding the movable contact base holder, and a transmission means for transmitting an opening / closing operation of an opening / closing mechanism to the movable contact base holder. Is arranged so that the direction of the current flowing through the power-side fixed contact block and the load-side fixed contact block and the direction of the current flowing through the movable contact block are reversed to generate an electromagnetic repulsive force. Side fixed contact and power supply side movable contact Amount and is characterized in that the load side movable contact and wipe amount between the load side stationary contact are configured differently.
[0009]
In a preferred embodiment, when the main circuit is closed, the wipe amount between the power source side fixed contact and the power source side movable contact is smaller than the wipe amount between the load side movable contact and the load side fixed contact. And
[0010]
The second invention of the present application includes a main circuit having a power supply side fixed contact block, a power supply side fixed contact, a power supply side movable contact, a movable contact block, a load side movable contact, a load side fixed contact, and a load side fixed contact block. An open / close mechanism that opens and closes the main circuit by rotating the movable contact base, a trip mechanism that pulls the open / close mechanism off when the current in the main circuit becomes abnormal, and a movable contact base In a circuit breaker including a movable contact base holder that is freely held, a holding means that rotatably holds the movable contact base holder, and a transmission means that transmits an opening / closing operation of the opening / closing mechanism to the movable contact base holder. The main circuit is arranged so that the direction of the current flowing through the power source side fixed contact block and the load side fixed contact block and the direction of the current flowing through the movable contact block are reversed to generate an electromagnetic repulsive force, and the main circuit is in the OFF state. When switching from ON to ON When either one of the side fixed contact and power source side movable contact pair or the load side movable contact and load side fixed contact pair is closed, a gap is formed between the other set of contacts. It is characterized by that.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described.
An embodiment of the circuit breaker according to the present invention will be described with reference to FIGS.
In this embodiment, the present invention is applied to a three-pole circuit breaker.
As shown in FIGS. 1 and 2, the circuit breaker according to the present embodiment includes a power supply-side fixed contact base 1, a power supply-side fixed contact 2, a power supply-side fixed contact base 1 at each pole in a housing 40 having a cover 40a and a case 40b. Main circuit 100 having a side movable contact 3, a movable contact base 4, a load side movable contact 5, a load side fixed contact 6, and a load side fixed contact base 7, and a power supply side terminal 1a electrically connected to the main circuit 100 And a load side terminal 7c.
As shown in FIGS. 1, 5, and 10, the power-side fixed contact base 1 and the load-side fixed contact base 7 are substantially pointed with respect to the rotation center of the movable contact base 4 that is rotatably held. It is provided at a symmetrical position. The power-side fixed contact base 1 has a power-side fixed contact 2 at a position facing the power-side movable contact 3, and the load-side fixed contact base 7 has a load-side fixed contact 6 at a position facing the load-side movable contact 5. Have.
The movable contact base 4 has a power source side movable contact 3 and a load side movable contact 5 at point-symmetric positions with respect to the center of rotation. The movable contact base 4 is rotatably held by the movable contact base holder 20, and the movable contact base holder 20 is rotatably held by the holding means 80. At least a portion of the main circuit 100 extending from the power source side fixed contact 2 to the load side fixed contact 6 via the movable contact base 4, the movable contact base holder 20, and the holding means 80 are stored in the main circuit case 22 as storage means. Thus, the unit 90 is configured. In this embodiment, the holding means 80 is formed integrally with the main circuit case 22 formed of an insulator. In this embodiment, the trip mechanism 50 that operates when the current of the main circuit 100 becomes abnormal and generates a mechanical output is provided on the load side of the load side fixed contact base 7 as shown in FIG. A fixed contact 6 is fixed integrally with an end 7b opposite to the end 7a to which the fixed contact 6 is fixed together with a load side terminal 7c.
[0021]
The main circuit case 22 has a mounting portion 22a for the tripping mechanism portion 50 outside thereof, and each unit 90 has a power supply side terminal 1a, a load side terminal 7c, and a tripping mechanism portion 50 arranged outside the main circuit case 22. In the installed state, as shown in FIG. 2, the rotating contact holders 20 for three poles are arranged side by side so that the rotational axes thereof are substantially on the same straight line. The term “substantially” as used herein includes that having a positional deviation or angular deviation within an allowable range. In FIG. 2, the leftmost pole shows the main circuit 100 in the unit 90 when viewed from the power supply side terminal 1a, and the main circuit case 22 and the trip mechanism 50 are not shown. ing.
[0022]
As shown in FIG. 9, the trip mechanism 50 of this embodiment includes a coil 52 connected between the load-side fixed contact base 7 and the load-side terminal 7 c, and a fixed core provided inside the coil 52. A cylindrical oil dash pot 53, a yoke 54 formed in an L shape and fixed to an L-shaped horizontal side 54h, and an L-shaped vertical side 54v of the yoke 54 When the coil 52 is energized by being pivotally locked to the end of the coil, the oil dash pot 53 attracts the movable core 55 to form a magnetic circuit loop, and the movable core 55 is separated from the oil dash pot 53. It has a spring 56 that is biased in the direction to be moved. In other words, in this embodiment, the conversion mechanism 51 for converting the electromagnetic force generated in the coil 52 into a mechanical output when an abnormal current flows through the main circuit 100 includes an oil dash pot 53, a yoke 54, and a movable core. 55 and a spring 56.
[0023]
As shown in FIG. 6, the load side fixed contact base 7 is formed with a rising portion 7 d having a rising dimension longer than the length of the coil 52 in the axial direction. In this embodiment, the diameter of the top 53a of the oil dash pot 53 is larger than the inner diameter of the coil 52. Therefore, the coil 52 is first inserted into the oil dash pot 53, and then the end 53b of the oil dash pot 53 is inserted. The yoke 54 is fixed by brazing or the like. In this state, the coil 52 is connected to the rising portion 7d of the load-side fixed contact base 7 and the rising portion 7e of the load-side terminal 7c with the oil dash pot 53 provided therein. One end of the coil 52, that is, either the winding start end or the winding end end is fixed to the upper end portion of the rising portion 7d so as to have an electrical connection by brazing or the like. On the other hand, a rising portion 7e is also formed on the load side terminal 7c, and the other end of the coil 52, that is, the winding end or winding start, is electrically connected to the upper portion of the rising portion 7e by brazing or the like. It is fixed as follows. Thereby, the load side fixed contact base 7 and the load side terminal 7 c are integrally connected via the coil 52. The movable core 55 and the spring 56 are attached to the succeeding iron 54 to form an assembly shown in FIG. In the assembly shown in FIGS. 6 and 9, since the load side fixed contact base 7, the coil 52, and the load side terminal 7c are integrated, the shape is stable and the load side fixed contact base 7 and the coil 52 are provided. The positional relationship with the load-side terminal 7c is constant, and it is easy to handle with an industrial robot or the like when assembled in the case 40b. 7 is a view of the assembly of FIG. 6 viewed from the top 53a side of the oil dash pot 53, and FIG. 8 is a view of the assembly of FIG. 6 viewed from the bottom 53c side of the oil dash pot 53.
[0024]
As shown in FIG. 8, the load-side fixed contact base 7 is formed with a hole 7 f through which the bottom 53 c of the oil dash pot 53 passes. The hole 7f is formed sufficiently large with respect to the diameter of the oil dash pot 53. The sufficiently large diameter means that the diameter of the hole 7f and the diameter of the oil dash pot 53 are different from each other even if the oil dash pot 53 is slightly displaced due to dimensional tolerance when the oil dash pot 53 is attached. It has a dimensional difference that can maintain an electrical insulation distance in a non-contact manner. Furthermore, an insulator 58 is wound around the outer peripheral surface of the oil dash pot 53 facing the coil 52, and the oil dash pot 53 is electrically insulated from the main circuit 100.
The oil dash pot 53 has an end 53b fixed to an L-shaped yoke 54 by brazing or the like, and a movable core 55 is pivotally locked to the yoke 54. The movable core 55 is urged by a spring 56 and is usually at a position separated from the top 53 a of the oil dash pot 53. When the coil 52 is excited, the magnetic attraction force of the oil dash pot 53 overcomes the biasing force of the spring 56 and the movable core 55 is attracted to and contacts the top 53a of the oil dash pot 53. 53 is formed as a loop of a magnetic circuit, that is, an end portion 53b of 53, a yoke 54, a movable core 55, a top portion 53a of the oil dashpot 53, and an oil dashpot 53. The yoke 54 is mounted on the mounting portion 22a of the tripping mechanism portion 50 formed outside the main circuit case 22, and is held in an electrically insulated state from the main circuit 100. As a result, the conversion mechanism 51 is electrically isolated from both the coil 52 and the main circuit 100 as shown in FIG. In this state, it is mounted on the mounting portion 22a of the storage means, and safety during maintenance / inspection can be improved. In addition, the unit 90 is configured by integrating the main circuit 100 extending from the power supply side terminal 1a to the load side terminal 7c and the trip mechanism unit 50 for each pole, so that a multi-pole circuit breaker is obtained. In this case, the units 90 need only be combined for the required number of poles (three poles in the present embodiment), and the workability during assembly can be greatly improved and excellent productivity can be obtained.
[0025]
An opening / closing mechanism 30 is attached to the outside of the central pole unit 90 among the three-pole units. As shown in FIGS. 14 and 15, the opening / closing mechanism 30 includes a lever 30 t to which the handle 60 is attached, an upper link 30 c and a lower link 30 b constituting a toggle link, and a rated current within the range of the rated current. A hook 30d that keeps the toggle link in a straight state in a normal ON state / OFF state (hereinafter referred to as a normal state), a tripping metal 30h that locks the hook 30d in a normal time, and a pin that pivotally pivots the tripping metal 30h 30g, a common tripping shaft 30a for transmitting the operation of the tripping mechanism 50, a trip fitting 30e for transmitting the movement of the common tripping shaft 30a to the tripping fitting 30h, and a pin 30f for pivotally stopping the trip fitting 30e ON during normal operation. An urging spring 30s for urging the lever 30t and the toggle links 30 and 30c during the OFF operation and tripping is mounted. In this embodiment, the common tripping shaft 30a is substantially parallel to the upper surface of the unit 90 over the unit 90 for three poles so that the operation can be transmitted to the trip fitting regardless of which of the three-pole tripping mechanism portions 50 is operated. It extends. The movable contact base 4 is mechanically connected to the lower link 30 b of the opening / closing mechanism 30 via the movable contact base holder 20 and the connecting member 25. The main circuit 100 is opened and closed by rotating the movable contact base 4. In a normal manual opening / closing operation, the opening / closing mechanism 30 is turned ON or OFF by the handle 60. When the opening / closing mechanism 30 is turned on, the contact holder 20 is rotated to the position where the power-side fixed contact base 1 and the load-side fixed contact base 7 are electrically connected by the operation of the lower link 30b. As a result, the main circuit 100 is closed. Between the three-pole units 90, there is provided a connecting member 25 that simultaneously rotates the movable contact base holder 20 of each pole to simultaneously open and close the contacts of each pole. The “simultaneous” mentioned here includes not only the completely same timing but also a case where there is a time difference within an allowable range. On the other hand, when the opening / closing mechanism 30 is turned off, the movable contact base holder 20 of each pole rotates simultaneously until the position where the power source side fixed contact base 1 and the load side fixed contact base 7 are electrically disconnected by the operation of the lower link 30b. To do. As a result, the main circuit 100 is separated.
[0026]
When an abnormal current larger than the rated current flows due to a short circuit or overload, the trip mechanism 50 operates to cause the opening / closing mechanism 30 to perform a trip operation. The tripping mechanism 50 for each pole is disposed at a position where its operation can be transmitted to the opening / closing mechanism 30 via the common tripping shaft 30a, and the current of the main circuit of at least one of the poles is in an abnormal state. When it becomes, it is comprised so that the opening-and-closing mechanism part 30 may be pulled off. When tripping is performed, the movable contact holder 20 of each pole rotates simultaneously to a position where the power-side fixed contact base 1 and the load-side fixed contact base 7 are electrically disconnected, and the main circuit 100 is opened. Shuts down the circuit.
[0027]
As shown in FIG. 10, positioning concave portions 22 g and convex portions 22 h are formed on the bottom surface of the main circuit case 22 of each unit 90. On the other hand, as shown in FIG. 1, a protrusion 40g that engages with the recess 22g and a recess 40h that engages with the protrusion 22h are formed at the bottom of the inner surface of the case 40b. Further, screw holes 1n and 7n are formed in the power supply side terminal 1a and the load side terminal 7c, respectively. The unit 90 corresponding to the number of poles (three poles in the present embodiment) is connected via the connecting member 25 in a state where the opening / closing mechanism 30 is mounted on one of the poles (the central pole in the present embodiment), In this state, it is inserted into the case 40b from the open side of the case 40b toward the bottom. In the inserted state, as shown in FIG. 1, the positioning concave portion 22g and the convex portion 22h of the unit 90 are engaged with the protrusion 40g and the concave portion 40h on the bottom of the inner surface of the case 40b, respectively, so that the main circuit 100 extends ( Movement in the direction from the power supply side terminal toward the load side terminal) or displacement is regulated. On the other hand, as shown in FIG. 2, the movement or displacement in the direction orthogonal to the extending direction of the main circuit 100 is restricted by the side walls 40s on both side surfaces of the case 40b and the partition walls 40k formed between the poles. As a result, positioning when the unit 90 is assembled in the case 40b can be facilitated, and assembly workability is improved. Further, as shown in FIG. 1, the unit 90 of each pole is fixed to the case 40b by screwing by attaching the screw 44 to the screw holes 1n and 7n from the bottom side of the case 40b and screwing. . As a result, the movement of the unit 90 in the direction from the bottom of the case 40b toward the opening side can be restricted or prevented. At the same time, the position of each unit 90 in the direction in which the main circuit 100 extends and the direction orthogonal to the direction in which the main circuit 100 extends are fixed. In this embodiment, the unit 90 can be fixed in the case 40b with two screws for each pole, and the number of assembly steps can be greatly reduced. In addition, since the assembly work can be a drop-in work, automatic assembly using an industrial robot or the like is possible.
[0028]
Further, in a conventional circuit breaker, an opening / closing mechanism or the like is fixed by screwing from a screw hole on the bottom surface of the case. Conventionally, since the opening / closing mechanism is also a charging part, it is necessary to insulate this screw, and an insulating cover is provided on the bottom of the case for insulation. For this reason, the bottom surface of the case has a double structure, which increases the size, increases the weight, and increases the number of assembly steps.
In this embodiment, the circuit breaker is loaded via a contact portion that can be opened and closed from the power supply side terminal 1a, that is, the power supply side fixed contact 2, the power supply side movable contact 3, the load side movable contact 5, and the load side fixed contact 6. The main circuit 100 reaching the side terminal 7c, the opening / closing mechanism 30 that opens and closes the contact portions 2, 3, 5, and 6, and the opening / closing mechanism 30 when the current of the main circuit 100 becomes abnormal. A tripping mechanism section 50 for generating a mechanical output, storage means 22 formed of an insulator and storing at least the contact portions 2, 3, 5, 6 of the main circuit 100 therein, and an insulator. And a housing 40 configured to store the main circuit 100, the opening / closing mechanism 30, the tripping mechanism 50, and the storage means 22. The trip mechanism 50 is integrated with the storage means 22 to form a unit 90, and the opening / closing mechanism 30 is further attached to the central unit 90. The power supply side terminal 1a and the load side terminal 7c are arranged so as to protrude from the storage means 22, and the power supply side terminal 1a and the load side terminal 7c are screwed and fixed to the terminal mounting portion at the end of the case 40b of the housing 40. As a result, the unit is fixed in the housing 40.
In this embodiment, each unit 90 can be fixed to the case 40b only by screwing the terminal portion, so that the screwing holes on the bottom surface of the case are not required and the case bottom surface is not required to be doubled, and the size of the housing is reduced. , The weight can be reduced. Furthermore, the number of screws for fixing the unit 90 can be reduced, and the number of assembly steps can be reduced. In this embodiment, the bottom portion of the portion of the case 40b that houses the unit 90 does not have a through-hole such as a screw hole, and is closed by the insulator layer on the bottom surface of the case 40b. Dust and moisture can be prevented from entering the battery, and reliability can be improved. In addition, since the bottom portion is composed only of the insulator layer on the bottom surface of the case 40b, heat generated inside the case 40b can be released through the bottom portion, and the temperature rise can be reduced.
[0029]
In each unit, the main circuit is arranged so that the direction of the current flowing through the power supply side fixed contact base 1 and the load side fixed contact base 7 and the direction of the current flowing through the movable contact base 4 are reversed to generate an electromagnetic repulsive force. Has been. Specifically, as shown in FIGS. 6 to 10, the power-side fixed contact base 1 and the load-side fixed contact base 7 are formed with cut-and-raised portions 1k and 7k, and the tips of the cut-and-raised portions 1k and 7k. The power supply side fixed contact 2 and the load side fixed contact 6 are fixed to the respective parts. As a result, the current flowing through the cut-and-raised portions 1k and 7k is in the opposite direction to the current flowing through the movable contact block 4, and when an abnormally large current such as a short circuit current (more than 10 times the rated current) flows, 1 and an electromagnetic repulsive force is generated between the load-side fixed contact base 7 and the movable contact base 4 so that the movable contact base 4 is repelled and separated.
[0030]
On the other hand, during normal ON / OFF operation, the wipe amount between the power source side fixed contact 2 and the power source side movable contact 3 and the wipe amount between the load side movable contact 5 and the load side fixed contact 6 when the main circuit 100 is closed. And are configured differently. Generally, in a circuit breaker or the like, when the switching mechanism is turned on in order to obtain a contact pressure or to remove the oxide film on the contact surface and maintain a good contact state, the switching mechanism An attempt is made to move the movable contact base to a position beyond the position where the movable contact and the fixed contact are in contact. At this time, the distance between the position where the movable contact reaches when there is no fixed contact and the fixed contact base and the position where the movable contact and the fixed contact contact when there is the fixed contact and the fixed contact base is called wipe. In this embodiment, as shown in FIG. 11, when the main circuit 100 is closed, the wipe amount between the power source side fixed contact 2 and the power source side movable contact 3 is the wipe amount between the load side movable contact 5 and the load side fixed contact 6. Configured to be smaller than the amount. Specifically, as shown in FIGS. 11A and 11B, the angle formed by the load-side fixed contact 6 and the load-side movable contact 5 is larger than the angle formed by the power-side fixed contact 2 and the power-side movable contact 3. Thus, the angle of the cut-and-raised portion 7k of the load-side fixed contact base 7 and the angle of the cut-and-raised portion 1k of the power-side fixed contact base 1 are set. Thus, the surface of the power supply side fixed contact 2 facing the power supply side movable contact 3 is a plane that forms a predetermined angle with respect to a plane parallel to the plane including the surface of the load side fixed contact 6 facing the load side movable contact 5. The power supply side fixed contact base 1 and the load side fixed contact base 7 are formed so as to be included. Therefore, as shown in FIG. 11B, when the main circuit shifts from the OFF state to the ON state and when the set of the load side movable contact 5 and the load side fixed contact 6 is closed (when contacted). In addition, a gap G is formed between the contacts of the set of the power supply side fixed contact 2 and the power supply side movable contact 3. From this state, the movable contact base 4 further rotates until both the contact pairs are closed and the main circuit is turned on, and the load side movable contact 5 and the load side fixed contact 6 continue to contact each other while sliding. On the other hand, the power source side fixed contact 2 and the power source side movable contact 3 are slid by the force of the contact spring after being brought into contact, and both the power source side and the load side are turned on. Accordingly, the wipe amount between the load-side movable contact 5 and the load-side fixed contact 6 is larger than the wipe amount between the power-side fixed contact 2 and the power-side movable contact 3, and the contact resistance of the contact on the load side can be reduced. .
In particular, in the present embodiment, since the coil 52 is interposed between the load side fixed contact base 7 and the load side terminal 7 c, heat generation at the load side fixed contact 6 is less likely to be radiated than the power source side fixed contact 2. On the other hand, since the power supply side fixed contact 2 is connected to the power supply side terminal 1a via the power supply side fixed contact base 1, it is easy to radiate heat. Therefore, as described above, the wipe amount between the load-side movable contact 5 and the load-side fixed contact 6 is made larger than the wipe amount between the power-side fixed contact 2 and the power-side movable contact 3 to reduce the contact resistance of the contact on the load side. By doing so, the amount of heat generated at the load-side fixed contact 6 can be reduced, and the temperature rise of the contact can be reduced. As a result, a circuit breaker with less heat generation and excellent safety and reliability can be obtained.
[0031]
The method of obtaining the wipe is not limited to this, and the configuration shown in FIG. 12 or 13 may be used. FIG. 12 shows a first modification in which the bending angle of the power supply side fixed contact base 1 and the load side fixed contact base 7 is changed as shown in FIG. The power source side movable contact 3 and the load side movable contact 5 are configured to have a predetermined angle with respect to the parallel line. Also in this modified example, when the main circuit 100 shifts from the OFF state to the ON state and when the set of the load side movable contact 5 and the load side fixed contact 6 is closed (contacted), the power source side fixed contact 2 A gap G is formed between the pair of contacts of the power source side movable contact 3 and the amount of wipe between the power source side fixed contact 2 and the power source side movable contact 3 is the same as that of the load side movable contact 6 as in the case of FIG. It becomes smaller than the wipe amount between the load side fixed contacts 5.
FIG. 13 shows a second modification. Instead of providing a cut-and-raised portion as in the first modification, the bending angles of the power-side fixed contact base 1 and the load-side fixed contact base 7 as shown in FIG. And the power source side movable contact 3 and the load side movable contact 5 of the movable contact base 4 are configured to have a predetermined angle with respect to the parallel line. In this modification, a gap G is formed between the contacts of the load side fixed contact 6 and the load side movable contact 5, and the wipe amount between the load side movable contact 5 and the load side fixed contact 6 is the same as that of the power source side fixed contact 2. It becomes smaller than the wipe amount between the power source side movable contacts 3. This modification is effective as a countermeasure when the heat generation on the power supply side is large.
Thus, in this embodiment, the contact resistance can be reduced on the load side or the power source side, and the heat generation at the contact can be reduced.
[0032]
An arc chute (arc extinguishing device) 24 that sucks and cools an arc generated at the time of interruption is provided in the vicinity of the contacts of the power supply side fixed contact base 1, the load side fixed contact base 7 and the movable contact base 4 in the main circuit case. . In order to effectively guide the arc to the arc extinguishing device 24, arc horns 26 are provided in each of the power supply side fixed contact base 1 and the load side fixed contact base 7 in this embodiment. In this embodiment, arc discharge ports 22b and 22c for discharging the cooled arc gas are provided on both the power supply side and the load side of the main circuit case 22. The arc discharge port 22b on the power supply side extends toward the surface side 40c (the side on which the operation handle 60 is provided) of the circuit breaker housing 40, and communicates with the power supply discharge port 40e opened near the surface of the housing power supply side end. . On the other hand, the arc discharge port 22c on the load side is provided in the vicinity of the bottom surface 40d of the end surface of the main circuit case 22, and communicates with the load side arc discharge path 40f on the bottom of the housing load side. Thereby, since arc gas is ejected to the surface 40c side on the power source side when the shut-off operation is performed, a mounting plate (not shown) on which the power source side terminal 1a and the circuit breaker are attached (not shown in the distribution board). In general, this mounting plate is electrically grounded), and it is possible to prevent the metal melt in the arc gas from adhering to it and prevent a ground fault from occurring after the interruption (power supply side terminal 1a). The voltage is applied even if the main circuit 100 is cut off). On the other hand, on the load side, arc gas is jetted to the bottom surface side of the load side end surface of the housing 40 through the load side arc discharge path 40f of the housing bottom portion 40d. Therefore, the metal melt in the arc gas is prevented from adhering to the tripping mechanism unit 50, and the reliability is improved.
[0033]
In this embodiment, when an abnormal large current such as a short-circuit current flows through the main circuit 100, the movable contact base 4 breaks an arc by the electromagnetic repulsive force with respect to the power source side fixed contact base 1 and the load side fixed contact base 7. It is configured to open to a position. At this time, in order to prevent a phenomenon that the rebound, that is, the movable contact base 4 once repelled and separated again approaches the power source side fixed contact base 1 and the load side fixed contact base 7 again to generate an arc and a current flows out. The contact base holder 20 is provided with a lock mechanism for the movable contact base 4. In the present embodiment, the lock mechanism having the structure filed in Japanese Patent Application No. 10-118110 is used. That is, in the state where the movable contact holder 4 is mounted on the movable contact holder 20, the movable contact holder 20 is connected to the stopper frame 10 pivotally supported by the first pin 16 as shown in FIG. And a second pin 14 pivotally supported by the stopper frame 10. The movable contact base 4 includes an engaging portion 4A that engages with the second pin 14, and when the movable contact base 4 repels, the second pin 14 engages and locks with the engaging portion 4A. The stand 4 is held in the repelling position. As shown in FIG. 16, the first pin 16 is inserted into the hole 20 b formed in the movable contact base holder 20, passes through the hole 10 d of the stopper frame 10, and rotates the stopper frame 10 into the movable contact base holder 20. Hold freely. As shown in FIG. 18, the first pin 16 is provided with a groove 16a, and the E-ring 17 is attached to the groove 16a while the stopper frame 10 is rotatably held in the movable contact base holder 20. Stop is done. The stopper frame 10 has a “U” -shaped cross section, and the rising portion 10a is provided with a hole 10d and a hole 10e. A first pin 16 is attached to the hole 10d, and a second pin 14 is rotatably attached to the hole 10e. Further, an oblong hole 10b for attaching one end of the spring 8 and a semicircular cutout 10c are provided at the bottom of the “U” shape. On the other hand, the other end of the spring 8 is engaged with the recess 4B of the movable contact base 4 as shown in FIG. When a large current such as a short-circuit current flows in this state, the movable contact base 4 is repelled and released, and after the end of the repulsion, the movable contact base 4 is engaged and held with the second pin 14 as shown in FIG. Rebound is prevented. Therefore, in this embodiment, as in Japanese Patent Application No. 10-118110, in the engaged state after the end of repulsion, the force with which the second pin 14 locks the engaging portion 4A is increased, and rebound can be reliably prevented. A circuit breaker excellent in breaking performance can be obtained.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the circuit breaker which can obtain the wipe of a movable contact stand reliably and has the stable interruption | blocking performance can be obtained.
[0035]
Moreover, according to this invention, the circuit breaker excellent in the workability | operativity at the time of an assembly can be obtained.
[0036]
Furthermore, according to the present invention, a highly safe circuit breaker can be obtained by electrically insulating the conversion mechanism that converts the electromagnetic force of the tripping mechanism into a mechanical output also from the main circuit.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a configuration of a circuit breaker according to an embodiment of the present invention.
FIG. 2 is a plan view showing a state in which the cover of the circuit breaker in one embodiment of the present invention is opened.
FIG. 3 is a plan view showing a configuration of a circuit breaker in one embodiment of the present invention.
FIG. 4 is a plan view showing a connection state of units of a circuit breaker in one embodiment of the present invention.
FIG. 5 is a front cross-sectional view showing a state before the load side fixed contact block of the circuit breaker unit according to the embodiment of the present invention is attached.
FIG. 6 is a front view showing a state in which an oil dashpot, a yoke, and a coil are attached to a load-side fixed contact base of a circuit breaker according to an embodiment of the present invention.
FIG. 7 is a plan view showing a state where an oil dashpot, a yoke, and a coil are attached to a load side fixed contact base of a circuit breaker in one embodiment of the present invention.
FIG. 8 is a bottom view showing a state in which an oil dashpot, a yoke, and a coil are attached to a load-side fixed contact base of a circuit breaker according to an embodiment of the present invention.
FIG. 9 is a front view showing a state in which an oil dashpot, a yoke, a coil, a movable core, and a spring are attached to a load-side fixed contact base of a circuit breaker according to an embodiment of the present invention.
FIG. 10 is a front sectional view showing the structure of a circuit breaker unit in an embodiment of the present invention.
11A and 11B are side views showing a structure for generating a circuit breaker wipe according to an embodiment of the present invention. FIG. 11A is a front view of a main part showing a gap formation state, and FIG. It is a front view which shows the state after completion | finish of wipe.
FIG. 12 is a front view showing a first modification of the structure for generating a circuit breaker wipe according to an embodiment of the present invention, in which FIG. 12 (a) is a side view of the main part showing a gap formation state; FIG. 4B is a front view showing a state after the wipe is completed.
FIG. 13 is a front view showing a second modification of the structure for generating a circuit breaker wipe in one embodiment of the present invention, in which FIG. 13 (a) is a side view of the main part showing a gap formation state; FIG. 4B is a front view showing a state after the wipe is completed.
FIG. 14 is a front sectional view showing a configuration of an opening / closing mechanism portion of the circuit breaker in one embodiment of the present invention.
FIG. 15 is a side view showing an attachment state of a common tripping shaft of the switching mechanism portion of the circuit breaker in one embodiment of the present invention.
FIG. 16 is a front view showing the outer shape of the movable contact holder of the circuit breaker in one embodiment of the present invention.
FIG. 17 is a front sectional view showing the internal configuration of the movable contact holder of the circuit breaker in one embodiment of the present invention.
FIG. 18 is an exploded perspective view showing the configuration of the stopper frame of the circuit breaker in one embodiment of the present invention.
FIG. 19 is a front sectional view showing a locked state after repulsion of the movable contact base of the circuit breaker in one embodiment of the present invention.
[Explanation of symbols]
1: Power supply side fixed contact block, 1a: Power supply side terminal 2: Power supply side fixed contact,
3: Power source side movable contact 4: Movable contact base, 5: Load side movable contact,
6: Load side fixed contact, 7: Load side fixed contact block, 7c: Load side terminal,
8: contact spring, 10: stopper frame, 14: first pin,
16: second pin, 20: movable contact block holder, 22: main circuit case,
22a: mounting part, 25: connecting member, 30: opening / closing mechanism part,
50: trip mechanism, 52: coil, 53: oil dashpot,
54: yoke, 55: movable core, 56: spring, 80: holding means,
90: Unit, 100: Main circuit

Claims (3)

電源側固定接点台、電源側固定接点、電源側可動接点、可動接点台、負荷側可動接点、負荷側固定接点及び負荷側固定接点台を有する主回路と、上記可動接点台を回動させることにより上記主回路を開閉する開閉機構部と、上記主回路の電流が異常状態となったときに上記開閉機構部を引き外す引外し機構部と、上記可動接点台を回動自在に保持する可動接点台ホルダと、この可動接点台ホルダを回動自在に保持する保持手段と、上記開閉機構部の開閉動作を上記可動接点台ホルダに伝達する伝達手段を備えた回路遮断器において、上記主回路は上記電源側固定接点台および上記負荷側固定接点台を流れる電流の向きと上記可動接点台を流れる電流の向きとが逆になって電磁反発力を発生するよう配設され、上記主回路の閉成時に上記電源側固定接点と上記電源側可動接点間のワイプ量と、上記負荷側可動接点と上記負荷側固定接点間のワイプ量とが異なるよう構成されたことを特徴とする回路遮断器。A main circuit having a power supply side fixed contact block, a power supply side fixed contact, a power supply side movable contact, a movable contact block, a load side movable contact, a load side fixed contact and a load side fixed contact block, and rotating the movable contact block. An opening / closing mechanism for opening and closing the main circuit, a tripping mechanism for removing the opening / closing mechanism when the current in the main circuit becomes abnormal, and a movable for rotatably holding the movable contact base. In a circuit breaker comprising a contact block holder, holding means for rotatably holding the movable contact block holder, and transmission means for transmitting an opening / closing operation of the opening / closing mechanism section to the movable contact table holder, the main circuit Is arranged such that the direction of the current flowing through the power source side fixed contact block and the load side fixed contact block and the direction of the current flowing through the movable contact block are reversed to generate an electromagnetic repulsive force. Power supply side when closed And wipes amount between the constant contact and the power supply side movable contact, the circuit breaker, characterized in that the wiping amount between the load side movable contact and said load side stationary contact is configured differently. 請求項1記載の回路遮断器において、上記主回路の閉成時に上記電源側固定接点と上記電源側可動接点間のワイプ量が、上記負荷側可動接点と上記負荷側固定接点間のワイプ量より小さくなるよう構成されたことを特徴とする回路遮断器。2. The circuit breaker according to claim 1, wherein when the main circuit is closed, a wipe amount between the power source side fixed contact and the power source side movable contact is greater than a wipe amount between the load side movable contact and the load side fixed contact. A circuit breaker configured to be small. 電源側固定接点台、電源側固定接点、電源側可動接点、可動接点台、負荷側可動接点、負荷側固定接点及び負荷側固定接点台を有する主回路と、上記可動接点台を回動させることにより上記主回路を開閉する開閉機構部と、上記主回路の電流が異常状態となったときに上記開閉機構部を引き外す引外し機構部と、上記可動接点台を回動自在に保持する可動接点台ホルダと、この可動接点台ホルダを回動自在に保持する保持手段と、上記開閉機構部の開閉動作を上記可動接点台ホルダに伝達する伝達手段を備えた回路遮断器において、上記主回路は上記電源側固定接点台および上記負荷側固定接点台を流れる電流の向きと上記可動接点台を流れる電流の向きとが逆になって電磁反発力を発生するよう配設され、上記主回路がOFF状態からON状態に移行するときに上記電源側固定接点と上記電源側可動接点の組および上記負荷側可動接点と上記負荷側固定接点の組のいずれか一方の組が閉成したときに他方の組の接点間には間隙が形成されているよう構成されたことを特徴とする回路遮断器。A main circuit having a power supply side fixed contact block, a power supply side fixed contact, a power supply side movable contact, a movable contact block, a load side movable contact, a load side fixed contact and a load side fixed contact block, and rotating the movable contact block. An opening / closing mechanism for opening and closing the main circuit, a tripping mechanism for removing the opening / closing mechanism when the current in the main circuit becomes abnormal, and a movable for rotatably holding the movable contact base. In a circuit breaker comprising a contact block holder, holding means for rotatably holding the movable contact block holder, and transmission means for transmitting an opening / closing operation of the opening / closing mechanism section to the movable contact table holder, the main circuit Is arranged such that the direction of the current flowing through the power source side fixed contact block and the load side fixed contact block and the direction of the current flowing through the movable contact block are reversed to generate an electromagnetic repulsive force. ON from OFF state When one of the set of the power supply side fixed contact and the power supply side movable contact and the set of the load side movable contact and the load side fixed contact is closed at the time of transition to the state, the other set of contacts A circuit breaker characterized in that a gap is formed between them.
JP22009498A 1998-08-04 1998-08-04 Circuit breaker Expired - Fee Related JP3721266B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP22009498A JP3721266B2 (en) 1998-08-04 1998-08-04 Circuit breaker
EP19990305863 EP0978858B1 (en) 1998-08-04 1999-07-23 Circuit breaker
DE1999630795 DE69930795T2 (en) 1998-08-04 1999-07-23 breaker
EP05015106A EP1600988A3 (en) 1998-08-04 1999-07-23 Circuit breaker

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JP22009498A JP3721266B2 (en) 1998-08-04 1998-08-04 Circuit breaker

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JP2005119150A Division JP4215741B2 (en) 2005-04-18 2005-04-18 Circuit breaker
JP2005119151A Division JP2005251758A (en) 2005-04-18 2005-04-18 Circuit breaker

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DE69930795D1 (en) 2006-05-24
EP1600988A3 (en) 2006-08-23
EP0978858A3 (en) 2000-10-25
EP1600988A2 (en) 2005-11-30
JP2000057930A (en) 2000-02-25
EP0978858A2 (en) 2000-02-09
EP0978858B1 (en) 2006-04-12
DE69930795T2 (en) 2006-11-30

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