JP2005304190A - Dc breaker - Google Patents

Dc breaker Download PDF

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JP2005304190A
JP2005304190A JP2004117408A JP2004117408A JP2005304190A JP 2005304190 A JP2005304190 A JP 2005304190A JP 2004117408 A JP2004117408 A JP 2004117408A JP 2004117408 A JP2004117408 A JP 2004117408A JP 2005304190 A JP2005304190 A JP 2005304190A
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discharge
circuit breaker
cradle
disconnector
open
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Takashi Nojiri
尚 野尻
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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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Abstract

<P>PROBLEM TO BE SOLVED: To improve a structure and an arrangement of a disconnector so as to improve assembling property and reduce a space in a discharging disconnector of a commutating capacitor mounted on the back face side of a cradle equipped with a drawing circuit breaker in a DC breaker for blocking by using the commutating capacitor. <P>SOLUTION: In the DC breaker provided with a plurality of discharging circuit breakers 4 in parallel for connecting the capacitor to a discharging circuit behind the cradle 1 equipped with the drawing circuit breaker as a means for discharging a charge stored in the commutating capacitor to the ground through a discharging resistor, all the discharging circuit breakers 4 are vertically turned off and aligned horizontally and vertically oriented, fixed contacts 4a are provided on the upper back face side of the cradle in parallel, opening and closing levers 4b are coupled on a lateral common rotational shaft 9 at an lower end, an operation handle is linked to the rotational shaft, and the disconnectors are collectively opened and closed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、パワーセンタなどの配電盤内に収設した引出形の回路遮断器(例えば高圧真空遮断器)に転流コンデンサを組み合わせて主回路電流を遮断する直流遮断装置に関し、詳しくは回路遮断器を搭載する盤内のクレードルに配置した前記転流コンデンサの放電用断路器の構成に係わる。   The present invention relates to a DC circuit breaker that cuts off a main circuit current by combining a commutation capacitor with a draw-out type circuit breaker (for example, a high-pressure vacuum circuit breaker) housed in a switchboard such as a power center. This relates to the structure of the disconnecting switch for discharging the commutation capacitor disposed in the cradle in the board on which the power is mounted.

頭記直流遮断装置として、回路遮断器の主回路接点間に転流コンデンサを組み合わせ、主回路電流(直流)の遮断時にあらかじめ転流コンデンサに充電しておいた電流を主回路電流に重畳させ、その合成電流が零値となったところで接点間に発生したアークを消滅させて主回路電流を遮断させるようにした遮断方式が周知である。また、かかる遮断方式を採用した直流遮断装置に関して、回路遮断器の保守,点検時における安全対策として、前記転流コンデンサに充電されている電荷を放電抵抗を通じてアース側に放電させるための手段として、引出形の回路遮断器を搭載して盤内に設置したクレードルの背後に転流コンデンサの放電用断路器を配備した構成が知られている(例えば、特許文献1参照)。
図4は、特許文献1(図1,図2および図9)に開示されている放電用断路器の構成,配置図である。図4において、1は図示されてない引出形回路遮断器(例えば高圧真空遮断器)を搭載して盤内に配置したクレードル、2はクレードル1の背面板を貫通して回路遮断器の遮断部と接続するように配備したブッシング形断路部、3はブッシング形断路部2と同じ高さに並べてクレードルの背面板に取り付けた接地用端子の支持座(絶縁板)、4は前記のブッシング形断路部2の端子2a,および支持座3に固定した接地用端子3aと個々に対応してクレードル1の背後に配備した放電用断路器、4aは前記ブッシング形断路部2の端子板2aおよび接地用端子3aに取り付けた固定接触子、4bは絶縁レバー4cの先端に断路刃4dを取り付けて固定接触子4aに対峙させた開閉レバー、5は放電抵抗、6は左右に並ぶ放電用断路器4の各開閉レバー4の間を連繋する連結リンク、8は左端に並ぶ放電用断路器4の開閉レバー4bに連結した回転操作軸であり、該操作軸8はクレードル1の底面を通して盤内の前部側に配した手動操作ハンドル(図示せず)に連結されている。
As a direct current circuit breaker, a commutation capacitor is combined between the main circuit contacts of the circuit breaker, and the current charged in the commutation capacitor in advance when the main circuit current (DC) is interrupted is superimposed on the main circuit current. An interruption method is known in which the arc generated between the contacts is extinguished to interrupt the main circuit current when the combined current becomes zero. In addition, as a safety measure at the time of maintenance and inspection of the circuit breaker, as a means for discharging the electric charge charged in the commutation capacitor to the ground side through a discharge resistor, with respect to the DC breaker adopting such a breaker method, A configuration is known in which a disconnecting switch for discharging a commutation capacitor is provided behind a cradle installed in a panel with a drawer type circuit breaker (see, for example, Patent Document 1).
FIG. 4 is a configuration and layout diagram of the discharge disconnector disclosed in Patent Document 1 (FIGS. 1, 2 and 9). In FIG. 4, reference numeral 1 denotes a cradle which is mounted in a panel with a draw-out type circuit breaker (not shown) (for example, a high-pressure vacuum circuit breaker), and 2 is a breaker of the circuit breaker penetrating the back plate of the cradle 1. Bushing-type disconnection part arranged so as to be connected to 3, 3 is a support seat (insulating plate) of a grounding terminal arranged on the back plate of the cradle side by side at the same height as the bushing-type disconnection part 2, 4 is the bushing-type disconnection The terminal 2a of the part 2 and the grounding terminal 3a fixed to the support seat 3 and the discharge disconnector provided behind the cradle 1 corresponding to the grounding terminal 3a and 4a are the terminal plate 2a of the bushing-type disconnecting part 2 and the grounding Fixed contact 4 attached to the terminal 3a, 4b is an open / close lever attached to the tip of the insulating lever 4c with a disconnecting blade 4d facing the fixed contact 4a, 5 is a discharge resistance, 6 is a discharge disconnector 4 arranged side by side. Each open A connecting link 8 connecting the levers 4 is a rotary operating shaft connected to the open / close lever 4b of the discharge disconnector 4 arranged at the left end. The operating shaft 8 passes through the bottom surface of the cradle 1 to the front side in the panel. It is connected to a manual operation handle (not shown).

上記構成になる放電用断路器の動作は特許文献1に詳しく述べられており、回路遮断器の点検時に際して転流コンデンサに充電されている電荷を放電抵抗5を通じてアース側に放電するには、ハンドルの手動操作により操作軸8をOFF位置に向けて時計方向に回す。これにより連結リンク6,7を介して相互連繋された各放電用断路器4の開閉レバー4bが図4(a)の断路位置から反時計方向に回動してその断路刃4dが固定接触子4aに接触し、放電用断路器が閉成して転流コンデンサの充電電荷が放電抵抗を通じてアース側に放電される。
特開2001−195961号公報
The operation of the discharge disconnector configured as described above is described in detail in Patent Document 1, and in order to discharge the electric charge charged in the commutation capacitor to the ground side through the discharge resistor 5 when the circuit breaker is inspected, By manually operating the handle, the operating shaft 8 is turned clockwise toward the OFF position. As a result, the open / close lever 4b of each discharging disconnector 4 interconnected via the connecting links 6 and 7 rotates counterclockwise from the disconnecting position in FIG. 4A, and the disconnecting blade 4d becomes a fixed contact. 4a is contacted, the discharge disconnector is closed, and the charge of the commutation capacitor is discharged to the ground side through the discharge resistor.
Japanese Patent Laid-Open No. 2001-195961

ところで、図4で述べた従来構成の放電用断路器は、構造,組立性の面で次記のような問題点がある。
すなわち、図4の従来構成では、左右に並べてクレードル1の背後に配備した3基の放電用断路器4は水平切形の断路器であり、各断路器の開閉レバー4bの下端を取付ベースに対し別々に軸支した上で、各開閉レバー4bの相互間を連結リンク6,7で連繋し、ハンドル操作により3基の断路器を一括して開閉するようにしている。また、限られたクレードル1の横幅範囲内で、隣り合う断路器の導体相互間に所要な絶縁距離を確保するために、左右両端に並ぶ断路器と中央に並ぶ断路器とを前後方向に位置をずらして離間させるようにしている。
このために、クレードル1の背面に配置した放電用断路器の組立構造が複雑となり、また連結リンク6,7を含めた部品点数も多くなる。しかも、放電用断路器の閉成操作時に各断路器4の断路刃4dを固定接触子4aに対して同じ接触量を確保させるように整合するには高い組立精度が必要であり、このために製品組立の際には各部品の取付位置,および開閉レバーの支点位置調整を要するなどその作業には多大な時間と手間がかかる。また、隣り合う断路器の間に必要な絶縁距離を確保するために左右両端に並ぶ断路器と中央に並ぶ断路器とを前後方向に位置をずらして配置しているために、クレードルの奥行き方向で放電用断路器が占有するスペースが増加して配電盤が大型化する問題もある。
Incidentally, the discharge disconnector having the conventional configuration described in FIG. 4 has the following problems in terms of structure and assemblability.
That is, in the conventional configuration of FIG. 4, the three discharge disconnectors 4 arranged side by side on the left and right behind the cradle 1 are horizontal disconnectors, and the lower end of the open / close lever 4b of each disconnector is used as the mounting base. On the other hand, after the shafts are separately supported, the open / close levers 4b are connected to each other by connecting links 6 and 7, and the three disconnectors are collectively opened and closed by a handle operation. Also, within the limited width range of the cradle 1, in order to ensure the required insulation distance between the conductors of adjacent disconnectors, the disconnectors aligned at the left and right ends and the disconnector aligned in the center are positioned in the front-rear direction. Are moved apart.
For this reason, the assembly structure of the discharge disconnector disposed on the back surface of the cradle 1 becomes complicated, and the number of parts including the connecting links 6 and 7 increases. Moreover, high assembly accuracy is required to align the disconnecting blade 4d of each disconnector 4 with the fixed contact 4a so as to ensure the same contact amount during the closing operation of the discharge disconnector. When assembling the product, it takes a lot of time and labor to adjust the mounting position of each part and the fulcrum position of the opening / closing lever. In addition, in order to ensure the necessary insulation distance between adjacent disconnectors, the disconnectors aligned at both the left and right ends and the disconnector aligned in the center are shifted in the front-rear direction, so the cradle depth direction Therefore, there is a problem that the space occupied by the disconnecting switch is increased and the switchboard is enlarged.

本発明は上記の点に鑑みなされたものであり、前記課題を解決して組立性の改善,および盤内における省スペース化が図れるように転流コンデンサの放電用断路器の構造,配置を改良した直流遮断装置を提供することを目的とする。   The present invention has been made in view of the above points, and has improved the structure and arrangement of the disconnecting switch for the discharge of the commutation capacitor so as to solve the above problems and improve the assembling property and save space in the panel. An object of the present invention is to provide a direct current circuit breaker.

上記目的を達成するために、本発明によれば、回路遮断器に転流コンデンサを組み合わせて主回路電流を遮断する直流遮断装置で、前記転流コンデンサの充電電荷を放電抵抗を介してアース側に放電させる手段として、引出形の回路遮断器を搭載したクレードルの背後に、前記コンデンサを含む転流回路を放電回路に接続する複数基の放電用断路器を並置配備したものにおいて、
前記放電用断路器を垂直切り形として左右一列に並べて縦向きに並置配備し、かつ各断路器の開閉レバーを共通な回転軸に連結した上で、該回転軸に操作ハンドルを連繋させて各断路器を一括して開閉操作するようにし(請求項1)、その具体的な態様として放電用断路器を次記のように構成する。
(1)前記の放電用断路器は、固定接触子と絶縁レバーの先端に断路刃を備えた開閉レバーとを対とした構造で、各断路器の固定接触子をクレードルの背面上部側に並置配備し、開閉レバーは固定接触子の配列に合わせて縦向きに並置した上で、各開閉レバーの下端を共通な横向き回転軸の軸上に連結する(請求項2)。
(2)前項(1)において、放電用断路器の固定接触子をクレードルの背面から後方に突き出した位置に設けた上で、該位置を基準に開閉レバーの開極位置をクレードルの背面寄りに設定して開閉操作するようにする(請求項3)。
In order to achieve the above object, according to the present invention, a DC circuit breaker that cuts off a main circuit current by combining a circuit breaker with a commutation capacitor, the charge of the commutation capacitor is grounded through a discharge resistor As a means for discharging, in the rear of the cradle equipped with a drawer type circuit breaker, a plurality of discharge disconnectors for connecting the commutation circuit including the capacitor to the discharge circuit are arranged in parallel,
The discharge disconnectors are arranged vertically in a vertical cut and arranged side by side in the vertical direction, and the open / close levers of each disconnector are connected to a common rotating shaft, and an operation handle is connected to the rotating shaft. The disconnectors are collectively opened and closed (Claim 1), and the discharge disconnector is configured as follows as a specific mode.
(1) The discharge disconnector has a structure in which a stationary contact and an open / close lever provided with a disconnecting blade at the end of an insulating lever are paired, and the fixed contact of each disconnector is juxtaposed on the upper back side of the cradle. The open / close levers are arranged in the vertical direction in accordance with the arrangement of the stationary contacts, and the lower ends of the open / close levers are connected to the common horizontal rotation shaft (Claim 2).
(2) In the preceding paragraph (1), the fixed contact of the discharge disconnector is provided at a position protruding rearward from the rear surface of the cradle, and the opening position of the opening / closing lever is located closer to the rear surface of the cradle based on this position. Set and open / close operation (claim 3).

上記構成によれば、左右一列に並べてクレードルの背後に配備した放電用断路器の開閉レバーを共通な回転軸の軸上に一括して連結するようにしたので、各断路器の開閉レバーの間を連結リンクを介して相互連繋させた従来の組立構造(図4参照)と比べて部品点数が少なくて済み、また組立の際に各断路器ごとに開閉レバーの回動支点位置を調整する必要もなく、これにより製品の組立作業性を大幅に改善できる。
しかも、断路器を従来の水平切形から垂直切形に替えて開閉レバーを縦向きに配置したことにより、各断路器を左右一列に並べてクレードルの背後に配備しても断路器相互間に十分な絶縁距離を確保でき、加えて開閉レバーの開極位置を固定接触子の手前(クレードル側)に設定したことにより、従来構造と比べて盤内の省スペース化が図れる。
According to the above configuration, since the open / close levers of the discharge disconnectors arranged in the left and right rows in the back of the cradle are connected together on the axis of the common rotating shaft, Compared to the conventional assembly structure (see Fig. 4) that is connected to each other via a connecting link, the number of parts is reduced, and it is necessary to adjust the rotation fulcrum position of the open / close lever for each disconnector during assembly. As a result, the assembly workability of the product can be greatly improved.
Moreover, by switching the disconnect switch from the conventional horizontal cut to the vertical cut, the open / close levers are arranged vertically, so that even when the disconnect switches are arranged in a row on the left and right sides, they are sufficient between the disconnect switches. Insulation distance can be secured, and in addition, the opening position of the opening / closing lever is set in front of the fixed contact (cradle side), so that the space in the panel can be saved compared to the conventional structure.

以下、本発明の実施の形態を図1〜図3に示す実施例に基づいて説明する。なお、実施例の図中で図4に対応する部材には同じ符号を付してその説明は省略する。
図1(a),(b)は図4の従来例に対応する本発明実施例の構成図であり、左右に並べてクレードル1の背後に配備した3基の放電用断路器4は垂直切り形の断路器として、その固定接触子4aがブッシング形断路部2の端子2a,および端子支持座3の接地用端子2aからL字形に後方に突き出すように形成されている。
一方、各断路器4の開閉レバー4bは、図2(a),(b)で示すように絶縁レバー4cの先端に二枚のブレードからなる断路刃4dをボルト4e,接圧スプリング4fを介して締結した構造になり、図1のように固定接触子4aの配列に合わせてその直下位置に縦向き姿勢で配列し、この位置で各開閉レバー4bの下端がクレードル1の底板上に敷設した横向きの共通回転軸9の軸上に向きを合わせて連結結合されている。なお、9aは共通回転軸9の両端に配したサポート(軸受金具)である。また、回転軸9の軸上には軸と直交して前方に延在する操作レバー9bが固定的に結合されており、図3で示すように前記操作レバー9bがクレードルの底面側に敷設した連結棒10を介して前方に配した梃子式の手動操作ハンドル11に連繋されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on the examples shown in FIGS. In addition, in the figure of an Example, the same code | symbol is attached | subjected to the member corresponding to FIG. 4, and the description is abbreviate | omitted.
FIGS. 1A and 1B are block diagrams of an embodiment of the present invention corresponding to the conventional example of FIG. 4. Three discharge disconnectors 4 arranged behind the cradle 1 side by side are vertically cut. The disconnecting contactor 4a is formed so as to protrude rearward in an L shape from the terminal 2a of the bushing-type disconnecting portion 2 and the grounding terminal 2a of the terminal support seat 3.
On the other hand, as shown in FIGS. 2 (a) and 2 (b), the open / close lever 4b of each disconnector 4 has a disconnecting blade 4d consisting of two blades at the tip of an insulating lever 4c via a bolt 4e and a contact spring 4f. As shown in FIG. 1, in accordance with the arrangement of the stationary contacts 4a, it is arranged in a vertical orientation at a position immediately below it, and the lower ends of the open / close levers 4b are laid on the bottom plate of the cradle 1 at this position. The horizontal common rotation shaft 9 is coupled and connected in the same direction on the axis. In addition, 9a is a support (bearing metal fitting) arranged at both ends of the common rotating shaft 9. Further, an operating lever 9b extending forward perpendicular to the axis is fixedly coupled on the axis of the rotary shaft 9, and the operating lever 9b is laid on the bottom side of the cradle as shown in FIG. It is connected to a lever-type manual operation handle 11 arranged forward via a connecting rod 10.

上記の構成において、常時は図1(b)で表すように放電用断路器4の開閉レバー4bが固定接触子4aから開離してクレードル1の背面寄りに傾動した姿勢に保持されている(断路器OFF)。なお、この開極状態では左右一列に並ぶ断路器4の相互間に所要の絶縁距離Aが確保されている。また、開閉レバー4bはブッシング形断路部2の下側に残る空きスペース側に後退しているので、盤内に余分なスペースを確保する必要がない。
前記のOFF状態から、転流コンデンサに充電されている電荷をアース側に放電させるために、操作ハンドル11を図3(a)のOFF位置から(b)のON位置に押し込むと、連結棒10,操作レバー9b,回転軸9を介して該回転軸上に連結した各断路器の開閉レバー4bが一緒に時計方向に回動し、その断路刃4dが固定接触子4aに接触して断路器4が投入される。これにより、転流コンデンサの充電電荷が放電抵抗を通じてアース側に放電されることになる。
In the above configuration, as shown in FIG. 1B, the open / close lever 4b of the discharge disconnector 4 is normally held in a posture in which it is separated from the fixed contact 4a and tilted toward the back of the cradle 1 (disconnection). Device OFF). In this open state, a required insulation distance A is secured between the disconnectors 4 arranged in a line on the left and right. Further, since the opening / closing lever 4b is retracted toward the empty space remaining below the bushing-type disconnecting portion 2, it is not necessary to secure an extra space in the panel.
When the operation handle 11 is pushed from the OFF position in FIG. 3A to the ON position in FIG. 3B in order to discharge the electric charge charged in the commutation capacitor to the ground side from the OFF state, the connecting rod 10 , The open / close lever 4b of each disconnector connected to the rotary shaft via the operation lever 9b and the rotary shaft 9 rotate clockwise together, and the disconnecting blade 4d contacts the fixed contact 4a to disconnect the disconnector. 4 is inserted. Thereby, the charge of the commutation capacitor is discharged to the ground side through the discharge resistor.

なお、図示実施例は特許文献1における図9の転流,放電回路に対応してクレードル1の背後に3基の放電用断路器4を備えたものを示したが、特許文献1における図4の転流,放電回路に対応して2基の放電用断路器4を装備する場合でも、図示実施例と同様な放電用断路器の構成,配置で実施することができるのは勿論である。   In the illustrated embodiment, three discharge disconnectors 4 are provided behind the cradle 1 corresponding to the commutation and discharge circuit of FIG. 9 in Patent Document 1, but FIG. Of course, even if two discharge disconnectors 4 are provided corresponding to the commutation and discharge circuits, the same configuration and arrangement of the discharge disconnectors as in the illustrated embodiment can be used.

本発明の実施例による直流遮断装置に装備した放電用断路器の構成配置図で、(a),(b)はそれぞれ背面図および側面図BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural layout diagram of a discharge disconnector equipped in a DC interrupter according to an embodiment of the present invention, wherein (a) and (b) are a rear view and a side view, respectively. 図1における放電用断路器の開閉レバーの構造図で、(a),(b)はそれぞれ正面図,上面図FIG. 2 is a structural diagram of an open / close lever of the discharge disconnector in FIG. 1, wherein (a) and (b) are a front view and a top view, respectively. 図1における放電用断路器の開閉動作の説明図で、(a),(b)はそれぞれOFF,ONの状態を表す図It is explanatory drawing of the opening / closing operation | movement of the disconnector for discharge in FIG. 1, (a), (b) is a figure showing the state of OFF and ON, respectively. 従来の直流遮断装置における放電用断路器の構成配置図で、(a),(b)はそれぞれ背面図および側面図FIG. 2 is a structural layout diagram of a discharge disconnector in a conventional DC interrupter, wherein (a) and (b) are a rear view and a side view, respectively.

符号の説明Explanation of symbols

1 クレードル
4 放電用断路器
4a 固定接触子
4b 開閉レバー
4c 絶縁レバー
4d 断路刃
9 共通回転軸
10 連結棒
11 操作ハンドル
DESCRIPTION OF SYMBOLS 1 Cradle 4 Discharge disconnector 4a Fixed contact 4b Opening / closing lever 4c Insulation lever 4d Disconnecting blade 9 Common rotating shaft 10 Connecting rod 11 Operation handle

Claims (3)

回路遮断器に転流コンデンサを組み合わせて主回路電流を遮断する直流遮断装置であり、前記転流コンデンサの充電電荷を放電抵抗を介してアース側に放電させる手段として、引出形の回路遮断器を搭載したクレードルの背後に、前記コンデンサを含む転流回路を放電回路に接続する複数の放電用断路器を並置配備したものにおいて、
前記放電用断路器を垂直切り形として左右一列に並べて縦向きに並置配備し、かつ各断路器の開閉レバーを共通な回転軸に連結した上で、該回転軸に操作ハンドルを連繋させて各断路器を一括して開閉操作するようにしたことを特徴とする直流遮断装置。
A DC circuit breaker that combines a circuit breaker and a commutation capacitor to cut off the main circuit current. As a means for discharging the charge of the commutation capacitor to the ground side through a discharge resistor, a drawer type circuit breaker is used. In the rear of the mounted cradle, a plurality of discharge disconnectors that connect the commutation circuit including the capacitor to the discharge circuit are juxtaposed,
The discharge disconnectors are arranged vertically in a vertical cut and arranged side by side in the vertical direction, and the open / close levers of each disconnector are connected to a common rotating shaft, and an operation handle is connected to the rotating shaft. A DC circuit breaker characterized in that the disconnector is collectively opened and closed.
請求項1に記載の直流遮断装置において、放電用断路器は固定接触子と絶縁レバーの先端に断路刃を備えた開閉レバーとを対として、各断路器の固定接触子をクレードルの背面上部側に並置配備し、開閉レバーは固定接触子の配列に合わせて縦向きに並置した上で、各開閉レバーの下端を共通な横向き回転軸の軸上に連結したことを特徴とする直流遮断装置。 2. The DC circuit breaker according to claim 1, wherein the discharge disconnecting device is a pair of a fixed contact and an opening / closing lever having a disconnecting blade at the tip of the insulating lever, and the fixed contact of each disconnecting device is connected to the upper rear side of the cradle. The DC breaker is characterized in that the open / close levers are juxtaposed in the vertical direction according to the arrangement of the stationary contacts, and the lower ends of the open / close levers are connected to a common horizontal rotation shaft. 請求項2に記載の直流遮断装置において、放電用断路器の固定接触子をクレードルの背面から後方に突き出した位置に設けた上で、該位置を基準に開閉レバーの開極位置をクレードルの背面寄りに設定して開閉操作するようにしたことを特徴とする直流遮断装置。 3. The DC circuit breaker according to claim 2, wherein the fixed contact of the discharge disconnecting switch is provided at a position protruding rearward from the rear surface of the cradle, and the opening position of the opening / closing lever is determined based on the position. A DC circuit breaker characterized in that it is set close to be opened and closed.
JP2004117408A 2004-04-13 2004-04-13 Dc breaker Withdrawn JP2005304190A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017198165A1 (en) * 2016-05-17 2017-11-23 浙江人民电器有限公司 Direct-current circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017198165A1 (en) * 2016-05-17 2017-11-23 浙江人民电器有限公司 Direct-current circuit breaker

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