JP3807042B2 - Earth leakage breaker - Google Patents

Earth leakage breaker Download PDF

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Publication number
JP3807042B2
JP3807042B2 JP22168797A JP22168797A JP3807042B2 JP 3807042 B2 JP3807042 B2 JP 3807042B2 JP 22168797 A JP22168797 A JP 22168797A JP 22168797 A JP22168797 A JP 22168797A JP 3807042 B2 JP3807042 B2 JP 3807042B2
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Japan
Prior art keywords
actuator
reset
trip
leaf spring
earth leakage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP22168797A
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Japanese (ja)
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JPH1167053A (en
Inventor
誠 小笠原
一彦 佐藤
喜▲吉▼ 長谷川
善明 川嶋
忠久 青木
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Fuji Electric FA Components and Systems Co Ltd
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Fuji Electric FA Components and Systems Co Ltd
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Priority to JP22168797A priority Critical patent/JP3807042B2/en
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Description

【0001】
【発明の属する技術分野】
この発明は漏電しゃ断器、詳しくは漏電しゃ断器に組み込んだトリップユニットの構成に関する。
【0002】
【従来の技術】
頭記の漏電しゃ断器として、しゃ断器ケースに操作ハンドル、トグル式接触子開閉機構、漏電検出部、漏電電流検出部からの信号を受けて動作するトリップコイル(常時は例えば永久磁石でアーマチュアを後退位置に保持し、動作時にコイル電流の磁力で動作位置に駆動する),該トリップコイルのアーマチュアに連結したアクチュエータ,およびアクチュエータに従動するトリップレバーを組合せたトリップユニットを組み込み、漏電発生時に動作するトリップユニットで主回路接触子を引外し動作して主回路電流をしゃ断するように構成したものが公知である。
【0003】
図3,図4はかかる漏電しゃ断器の基本構成図であり、各図において、1はしゃ断器ケース、2は支軸2aを中心に摺動する開閉操作用ハンドル、3は固定接触子、4は可動接触子、5は零相CTを備えた漏電検出器、6はトリップユニットのトリップコイル、7はトリップコイル6のアーマチュア(可動鉄心)6aの下端に連結したアクチュエータ、8はトリップレバー、9はトリップコイル6のアーマチュア6aに連桿6bを介して上端側に連結した漏電表示ボタンである。なお、図示していないが、前記した操作ハンドル2と可動接触子4との間にはトグルリンクと開閉駆動ばねで構成した接触子開閉機構が、また従来の漏電しゃ断器では接触子開閉機構とは別に操作ハンドル2とトリップレバー8との間にはリンク機構で構成したリセットレバーが組み込まれている。
【0004】
かかる構成で、定常通電時には図3の実線で表すように可動接触子4が固定接触子3に接触して閉極している。ここで、主回路に漏電が発生したことを漏電検出器5が検知すると、その出力信号によりトリップコイル6が動作し、そのアーマチュア6aが図4の位置に吸引されてアクチュエータ7,および漏電表示ボタン9を上方に引き上げる。これにより、トリップレバー8がトリップ位置に揺動し、トグル式接触子開閉機構のラッチ(図示せず)を外して引外し動作させ、可動接触子4を図3の鎖線位置に開離して主回路電流をしゃ断する。同時に、漏電表示ボタン9(常時はケース1の内方に引っ込んでいる)がケース1から外側に突き出してしゃ断器がトリップ動作したことを外部に知らせる。
【0005】
また、しゃ断器が引外し動作した後に、漏電の原因を修復した上でしゃ断器を投入するに際して、まず操作ハンドル2をトリップ位置からリセット位置に回すと、これに従動するリセットレバー(図示せず)がトリップユニットのアクチュエータ7を下方に引き下ろしてリセット位置に復帰させ、続いて操作ハンドル2をオン位置に戻すと、接触子開閉機構が反転動作して可動接触子4が閉極位置(図3の実線位置)に復帰する。
【0006】
【発明が解決しようとする課題】
ところで、従来のように操作ハンドル2とトリップユニットのアクチュエータ7との間をリンク式のリセットレバーで連係し、ハンドル操作によりトリップユニットをリセットさせるようにした構成では信頼性の面で次記のような問題がある。
【0007】
すなわち、複数のリンク部品を組合せてリセットレバーを組立てた構成では、各部品の寸法誤差,組立工程で各部品間に生じるガタ,遊びが原因で、操作ハンドル2をリセット位置に回してもトリップユニットがリセット位置に正しく復帰しないといったリセット動作上での問題が生じ易く、このことが製品の信頼性を低下させる一要因となっている。加えて、リセットレバーを構成する部品点数,組立工数も増してコスト高となる。
【0008】
この発明は上記の点に鑑みなされたものであり、その目的は前記課題を解決し、簡易な構成でトリップユニットを確実にリセットできるように改良した漏電しゃ断器を提供することにある。
【0009】
【課題を解決するための手段】
上記目的を達成するために、この発明によれば、漏電電流検出部からの信号を受けて動作するプランジャ形トリップコイルのアーマチュアにアクチュエータと漏電表示ボタンを連結し、該アクチュエータに従動するトリップレバーを介して主回路接触子を引外し動作させる漏電しゃ断器であり、引外し動作後のリセットをハンドル操作で行うようにしたものにおいて、操作ハンドルと一体に前記アクチュエータに向けて突き出すリセットアームを設け、前記アクチュエータの昇降移動経路に沿って自己保持用の板ばねを前記トリップコイルに取付けるとともに、前記アクチュエータの前記板ばねと対向する位置に係合段部を設け、かつ前記板ばねに前記アクチュエータの係合段部と当接してアクチュエータをトリップ位置に係止保持する凸部を設け、前記アクチュエータは、トリップ時に係合段部が板ばねの凸部を乗り越えてトリップ位置に係止保持されるとともに、リセット操作時にリセットアームを介してトリップ位置からリセット位置に向けてダイレクトに突き押し駆動されると、係合段部が板ばねの凸部を乗り越えてリセット位置にリセットされるように構成するものとする(請求項1)。
【0011】
上記の構成で、しゃ断器の引外し動作後に操作ハンドルをリセット位置に回すと、ハンドルに設けたリセットアームの先端がトリップユニットのアクチュエータをダイレクトに押し込んでリセット位置に復帰させる。また、アクチュエータはリセット位置に復帰すると、このリセット位置で板ばね部材に係止して自己保持される。
【0012】
しかも、リセットアームは操作ハンドルと一体に形成されているので、リンク機構で構成した従来のリセットレバーで問題となる部品間のガタ,遊びがなく、アクチュエータに一定のストロークを与えて確実にリセットすることができるほか、簡易な構造で対応できる。
【0013】
【発明の実施の形態】
以下、この発明の実施の形態を図1,図2の実施例に基づいて説明する。なお、実施例の図中で図3,図4に対応する同一部材には同じ符号が付してある。
すなわち、この実施例においては、樹脂成形品で作られた操作ハンドル2には一体成形したリセットアーム2bが設けてあり、このリセットアーム2bの先端がトリップコイル6のアーマチュア6aに連結してケース内に組み込んだアクチュエータ7の肩部7aの上面に対向している。
【0014】
また、このアクチュエータ7の昇降移動経路に沿って側方には中央を凸状に湾曲した自己保持用の板ばね10がトリップコイル6の下端側に取付けてある。この板ばね10は、アクチュエータ7の係合段部7bに当接してアクチュエータ7が図示実線で示すトリップ位置に引き上げられた状態で、トリップコイル6の通電が停止した後もこの位置に係止保持する。
【0015】
かかる構成で、引外し動作したしゃ断器をリセットする際に、操作ハンドル2を図1のリセット位置に回すと、リセットアーム2bが支軸2aを支点に反時計方向に回動し、トリップユニットのアクチュエータ7をダイレクトに押し下げ駆動する。これれにより、アクチュエータ7は板ばね10の凸部を乗り越えて図2の実線位置から鎖線位置に移動してリセットされる。
【0016】
【発明の効果】
以上述べたように、この発明の構成によれば、操作ハンドルと一体にアクチュエータに向けて突き出すリセットアームを設け、前記アクチュエータの昇降移動経路に沿って自己保持用の板ばねを前記トリップコイルに取付けるとともに、前記アクチュエータの前記板ばねと対向する位置に係合段部を設け、かつ前記板ばねに前記アクチュエータの係合段部と当接してアクチュエータをトリップ位置に係止保持する凸部を設け、前記アクチュエータは、トリップ時に係合段部が板ばねの凸部を乗り越えてトリップ位置に係止保持されるとともに、リセット操作時にリセットアームを介してトリップ位置からリセット位置に向けてダイレクトに突き押し駆動されると、係合段部が板ばねの凸部を乗り越えてリセット位置にリセットされるように構成したので、操作ハンドルに従動するトリップレバーをリンク機構で構成した従来のものと較べて、部品相互間のガタ,遊びもなく、常に一定したリセットストロークでトリップユニットをリセットさせることができて信頼性が向上する。また、構造的にも従来と較べて部品点数,組立工数も少なくてコストダウンが図れる。
【図面の簡単な説明】
【図1】この発明の実施例による漏電しゃ断器の主要内部構造を表した側面図
【図2】図1に組み込んだトリップユニットの構成図
【図3】この発明の実施対象となる漏電しゃ断器の基本構成図
【図4】図3におけるトリップユニットの構成図
【符号の説明】
1 しゃ断器ケース
2 操作ハンドル
2a 支軸
2b リセットアーム
4 可動接触子
5 漏電検出器
6 トリップコイル
6a アーマチュア
7 アクチュエータ
8 トリップレバー
10 自己保持用板ばね
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an earth leakage breaker, and more particularly to a configuration of a trip unit incorporated in the earth leakage breaker.
[0002]
[Prior art]
Trip coil that operates in response to signals from the operation handle, toggle contactor opening / closing mechanism, leakage detection unit, and leakage current detection unit as the earth leakage breaker described above (always retracts the armature with a permanent magnet, for example) A trip unit that combines an actuator connected to the armature of the trip coil and a trip lever that is driven by the actuator and incorporates a trip unit that operates when a leakage occurs. It is well known that the unit is configured to trip the main circuit contact to cut off the main circuit current.
[0003]
3 and 4 are basic configuration diagrams of such an earth leakage breaker. In each figure, 1 is a circuit breaker case, 2 is an opening / closing operation handle that slides around a support shaft 2a, 3 is a stationary contact, 4 Is a movable contact, 5 is a leakage detector with zero-phase CT, 6 is a trip coil of a trip unit, 7 is an actuator connected to the lower end of an armature (movable iron core) 6a of the trip coil 6, 8 is a trip lever, Is an earth leakage display button connected to the armature 6a of the trip coil 6 on the upper end side via a linkage 6b. Although not shown, a contact opening / closing mechanism constituted by a toggle link and an opening / closing drive spring is provided between the operation handle 2 and the movable contact 4, and a contact opening / closing mechanism is provided in the conventional earth leakage breaker. Separately, a reset lever constituted by a link mechanism is incorporated between the operation handle 2 and the trip lever 8.
[0004]
With such a configuration, the movable contact 4 comes into contact with the fixed contact 3 to be closed as indicated by the solid line in FIG. When the leakage detector 5 detects that a leakage has occurred in the main circuit, the trip coil 6 is operated by the output signal, and the armature 6a is attracted to the position shown in FIG. Pull 9 up. As a result, the trip lever 8 swings to the trip position, the latch (not shown) of the toggle-type contact opening / closing mechanism is removed and the tripping operation is performed, and the movable contact 4 is opened to the chain line position in FIG. Cut off circuit current. At the same time, the earth leakage display button 9 (which is normally retracted inside the case 1) protrudes outward from the case 1 to inform the outside that the circuit breaker has tripped.
[0005]
In addition, after the breaker has tripped, after repairing the cause of the leakage, when the breaker is turned on, first, when the operation handle 2 is turned from the trip position to the reset position, a reset lever (not shown) is driven. ) Pulls the actuator 7 of the trip unit downward to return it to the reset position, and then returns the operation handle 2 to the ON position, the contact opening / closing mechanism reverses and the movable contact 4 is closed (FIG. 3). (Solid line position).
[0006]
[Problems to be solved by the invention]
By the way, in the conventional configuration in which the operation handle 2 and the trip unit actuator 7 are linked by a link type reset lever and the trip unit is reset by the handle operation as in the prior art, as described below in terms of reliability. There is a problem.
[0007]
That is, in the configuration in which the reset lever is assembled by combining a plurality of link parts, the trip unit even if the operating handle 2 is turned to the reset position due to dimensional errors of each part, backlash between the parts in the assembly process, and play. However, it is easy to cause a problem in the reset operation in that the product does not return to the reset position correctly, and this is one factor that lowers the reliability of the product. In addition, the number of parts and assembly man-hours constituting the reset lever are increased, resulting in higher costs.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide an improved circuit breaker that solves the above-described problems and can reliably reset the trip unit with a simple configuration.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an actuator and a leakage indicator button are connected to an armature of a plunger type trip coil that operates in response to a signal from a leakage current detector, and a trip lever that is driven by the actuator is provided. An earth leakage circuit breaker that trips the main circuit contact through, and is configured to perform reset after the trip operation by operating the handle, provided with a reset arm that projects toward the actuator integrally with the operation handle, A self-holding leaf spring is attached to the trip coil along the actuator's up-and-down movement path, an engaging step is provided at a position facing the leaf spring of the actuator, and the leaf spring is engaged with the actuator. A convex part that contacts the stepped part and holds the actuator in the trip position. Provided, the actuator, pushing the engaging step portion in the trip time is engaging held to the trip position over the convex portion of the leaf spring, directly toward the reset position from the trip position via the reset arm on reset operation When the drive is pushed , the engaging stepped portion is moved over the convex portion of the leaf spring and reset to the reset position (claim 1).
[0011]
With the above configuration, when the operating handle is turned to the reset position after the tripping operation of the circuit breaker, the tip of the reset arm provided on the handle directly pushes the actuator of the trip unit to return to the reset position. Further, when the actuator returns to the reset position, the actuator is locked and held by the leaf spring member at the reset position.
[0012]
Moreover, since the reset arm is formed integrally with the operation handle, there is no backlash and play between the parts that would be a problem with the conventional reset lever configured with a link mechanism, and the actuator is reliably reset by giving a certain stroke. It can be handled with a simple structure.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples of FIGS. In the drawings of the embodiment, the same members corresponding to those in FIGS. 3 and 4 are denoted by the same reference numerals.
That is, in this embodiment, the operation handle 2 made of a resin molded product is provided with an integrally formed reset arm 2b, and the tip of the reset arm 2b is connected to the armature 6a of the trip coil 6 in the case. It faces the upper surface of the shoulder portion 7a of the actuator 7 incorporated in the actuator.
[0014]
In addition, a self-holding leaf spring 10 having a convexly curved center is attached to the lower end side of the trip coil 6 along the upward / downward movement path of the actuator 7. The leaf spring 10 is held in contact with the engagement step portion 7b of the actuator 7 and held in this position even after the trip coil 6 is de-energized while the actuator 7 is pulled up to the trip position indicated by the solid line in the figure. To do.
[0015]
In this configuration, when resetting the tripping circuit breaker, when the operation handle 2 is turned to the reset position in FIG. 1, the reset arm 2b rotates counterclockwise around the support shaft 2a, and the trip unit The actuator 7 is driven down directly. As a result, the actuator 7 gets over the convex portion of the leaf spring 10 and moves from the solid line position in FIG. 2 to the chain line position to be reset.
[0016]
【The invention's effect】
As described above, according to the configuration of the present invention, the reset arm that protrudes toward the actuator is provided integrally with the operation handle, and the self-holding leaf spring is attached to the trip coil along the upward / downward movement path of the actuator. In addition, an engagement step portion is provided at a position facing the plate spring of the actuator, and a convex portion is provided on the plate spring to contact the engagement step portion of the actuator so as to lock and hold the actuator in a trip position. The actuator is driven and pushed directly from the trip position to the reset position via the reset arm during the reset operation , while the engaging stepped part gets over the convex part of the leaf spring during the trip. Once, configured so that the engaging step portion is reset to the reset position over the convex portion of the leaf spring Therefore, compared to the conventional trip lever driven by the operation handle with a link mechanism, there is no backlash and play between parts, and the trip unit can always be reset with a constant reset stroke. Will improve. Also, structurally, the number of parts and assembly man-hours are small compared with the conventional one, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a main internal structure of an earth leakage breaker according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a trip unit incorporated in FIG. 1. FIG. Basic configuration diagram [Fig. 4] Configuration diagram of trip unit in Fig. 3 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit breaker case 2 Operation handle 2a Support shaft 2b Reset arm 4 Moving contact 5 Leakage detector 6 Trip coil 6a Armature 7 Actuator 8 Trip lever 10 Self-holding leaf spring

Claims (1)

漏電電流検出部からの信号を受けて動作するプランジャ形トリップコイルのアーマチュアにアクチュエータと漏電表示ボタンを連結し、該アクチュエータに従動するトリップレバーを介して主回路接触子を引外し動作させる漏電しゃ断器であり、引外し動作後のリセットをハンドル操作で行うようにしたものにおいて、
操作ハンドルと一体に前記アクチュエータに向けて突き出すリセットアームを設け、前記アクチュエータの昇降移動経路に沿って自己保持用の板ばねを前記トリップコイルに取付けるとともに、前記アクチュエータの前記板ばねと対向する位置に係合段部を設け、かつ前記板ばねに前記アクチュエータの係合段部と当接してアクチュエータをトリップ位置に係止保持する凸部を設け、
前記アクチュエータは、トリップ時に係合段部が板ばねの凸部を乗り越えてトリップ位置に係止保持されるとともに、リセット操作時にリセットアームを介してトリップ位置からリセット位置に向けてダイレクトに突き押し駆動されると、係合段部が板ばねの凸部を乗り越えてリセット位置にリセットされることを特徴とする漏電しゃ断器。
An earth leakage circuit breaker that connects an actuator and an earth leakage display button to an armature of a plunger type trip coil that operates in response to a signal from an earth leakage current detector, and trips a main circuit contactor via a trip lever that is driven by the actuator. In the case where the reset after the trip operation is performed by the handle operation,
A reset arm that protrudes toward the actuator is provided integrally with the operation handle, and a self-holding leaf spring is attached to the trip coil along the up-and-down movement path of the actuator, and at a position facing the leaf spring of the actuator. An engagement step portion is provided, and a convex portion is provided on the leaf spring to contact the engagement step portion of the actuator to lock and hold the actuator in a trip position.
The actuator is driven and pushed directly from the trip position to the reset position via the reset arm during the reset operation , while the engaging stepped part gets over the convex part of the leaf spring during the trip. When this is done, the earth leakage circuit breaker is characterized in that the engagement step portion is moved over the convex portion of the leaf spring and reset to the reset position .
JP22168797A 1997-08-18 1997-08-18 Earth leakage breaker Expired - Fee Related JP3807042B2 (en)

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Application Number Priority Date Filing Date Title
JP22168797A JP3807042B2 (en) 1997-08-18 1997-08-18 Earth leakage breaker

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Publication Number Publication Date
JPH1167053A JPH1167053A (en) 1999-03-09
JP3807042B2 true JP3807042B2 (en) 2006-08-09

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KR100364824B1 (en) * 2000-12-05 2002-12-16 엘지산전 주식회사 The current leakage trip device in earth leakage circuit breaker
JP4967602B2 (en) * 2006-10-31 2012-07-04 富士電機機器制御株式会社 Earth leakage trip device for earth leakage breaker
CN107452562A (en) * 2017-03-20 2017-12-08 乐清市五环电器有限公司 The residual current action breaker of the protection with overcurrent with electric leakage instruction
CN113257630A (en) * 2020-02-10 2021-08-13 西门子股份公司 Circuit breaker accessory and circuit breaker assembly

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