JPS61208718A - Circuit breaker - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 ［発明の技術分野］ 本発明は、常時は接触状態にある第１及び第２の可動接
触子を事故電流例えば短絡電流に基づく電磁反発力を利
用して・互に離反させる構成の回路。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention allows first and second movable contacts, which are normally in contact, to be brought into contact with each other using electromagnetic repulsion based on a fault current, such as a short-circuit current. A circuit configured to separate.

しゃ断器に関する。Regarding circuit breaker.

［発明の技術的背景］ 回路しゃ断器は、基本的には、過電流検出時に引外し装
置により可動接触子を開路位置がら開路位置に変位させ
て主回路を開路する構成である。[Technical Background of the Invention] A circuit breaker is basically configured to open a main circuit by displacing a movable contact from an open position to an open position using a tripping device when an overcurrent is detected.

ところが、近年、遮断性能の向上を図って、引外し装置
により変位される第１の可動接触子に加え、閉路位置に
あるこの第１の可動接触子に常時接触するよう付勢され
た第２の可動接触子を設け、事故電流が両回動接触子に
互いに逆方向に流れるときの電磁反発力を利用して第２
の可動接触子を第１の可動接触子から離反させアークを
引きのばすことによって事故電流の限流を図る構成が提
案され、特公昭５８．−４８９８０号として公知であり
、その構造は第７図に示す通りである。即ち、１はケー
ス２に設けた操作ハンドル、３は軸４を中心に回動可能
に枢支された第１の可動接触子、５は第１の可動接触子
３に連結した周知のトグル機構、６は過電流引外し装置
である。過電流引外し装置６は、主回路の過電流を検出
した時にラッチ７によるキャッチ８の係止を解くことに
より、第１の可動接触子３の図示した閉路位置から時計
回り方向に回動した図示しない開路位置への回動を許容
する。７は第１の可動接触子３の下方に沿うように設け
た第２の可動接触子で、これは軸８を中心に回動可能に
支持されると共に、引張りばね９により常時は先端部が
第１の可動接触子３の先端部に接触するように付勢され
て主回路を閉路している。第２の可動接触子７の下方に
は電源側端子を構成する固定導体１０が延在され、固定
導体１０は可撓導体１１を介して第２の可動接触子７に
接続されている。この構成において、主回路に例えば短
絡電流のような大きな事故電流が流れると、第１及び第
２の可動接触子３．７に互いに逆方向の電流が流れるた
め、両可動接触子３．７間に電磁反発力が発生する。こ
のため、過電流例外し装置６の作動に基づ（第１の可動
接触子３の開路動作に先立ち、第２の可動接触子７が電
磁反発力により図中反時計回り方向に回動して第１の可
動接触子３から離反し、アークの発生により事故電流が
限流され、その後過電流例外し装置６の作動により第１
の可動接触子３が開路位置に変位して主回路が完全に開
路される。However, in recent years, with the aim of improving the breaking performance, in addition to the first movable contact displaced by the tripping device, a second movable contact that is energized so as to be in constant contact with the first movable contact in the closed circuit position has been introduced. A second movable contact is provided, and a second
A structure was proposed in which the fault current was limited by separating the movable contactor from the first movable contactor and elongating the arc. It is known as No.-48980, and its structure is as shown in FIG. That is, 1 is an operating handle provided on the case 2, 3 is a first movable contact rotatably supported around a shaft 4, and 5 is a well-known toggle mechanism connected to the first movable contact 3. , 6 is an overcurrent tripping device. The overcurrent tripping device 6 rotates the first movable contact 3 clockwise from the illustrated closing position by releasing the catch 8 by the latch 7 when an overcurrent in the main circuit is detected. Allows rotation to an open position (not shown). A second movable contact 7 is provided along the lower side of the first movable contact 3. This is rotatably supported around a shaft 8, and a tension spring 9 keeps the tip of the contact It is urged to contact the tip of the first movable contact 3 to close the main circuit. A fixed conductor 10 constituting a power supply terminal extends below the second movable contact 7 , and the fixed conductor 10 is connected to the second movable contact 7 via a flexible conductor 11 . In this configuration, when a large fault current such as a short-circuit current flows in the main circuit, currents in opposite directions flow through the first and second movable contacts 3.7, so that between the two movable contacts 3.7 An electromagnetic repulsive force is generated. Therefore, based on the operation of the overcurrent exception device 6 (prior to the opening operation of the first movable contact 3, the second movable contact 7 rotates counterclockwise in the figure due to electromagnetic repulsion). The electric current separates from the first movable contact 3, the fault current is limited due to the generation of an arc, and then the overcurrent exception occurs and the first movable contact 3
The movable contact 3 is moved to the open position, and the main circuit is completely opened.

［背景技術の問題点］ ところでこのような構成のものにおいて、限流効果を更
に向上させるには電磁反発力を高めて両可動接触子３．
７間の開路速度を高めることが肝要である。この電磁反
発力を高めるためには両可動接触子３．７の平行部分を
長くする方法と、下方の即ち第２の可動接触子７を小形
にし以て質ｌを下げる方法とのニガ法が考えられる。[Problems with Background Art] In order to further improve the current limiting effect in such a structure, the electromagnetic repulsion force is increased and both movable contacts 3.
It is important to increase the opening speed between 7 and 7. In order to increase this electromagnetic repulsion, there are two methods: lengthening the parallel parts of both movable contacts 3.7, and reducing the quality by making the lower, ie, second, movable contact 7 smaller. Conceivable.

しかしながら前者の方法は装置の大形化を招くので得策
でないことは明らかである。後者の方法は可動接触子７
を小形軽量にする方法として断面積を減すると抵抗値が
増すので短い形状をもって小形化を図らざるを得ない。However, it is clear that the former method is not a good idea because it increases the size of the device. The latter method uses movable contact 7
As a way to make the device smaller and lighter, reducing the cross-sectional area increases the resistance value, so it is necessary to make the device smaller and have a shorter shape.

そうすると相手可動接触子３との間の平行対向長が減じ
られ電磁反発力が減少するので期待するほどの効果は得
られない。In this case, the length of parallel opposition between the mating movable contact 3 and the electromagnetic repulsion is reduced, so that the expected effect cannot be obtained.

［発明の目的コ そこで本発明の目的は一対の可動接触子の一方を短い形
状とすることにより軽量化を図りながらも電磁反発力に
よる開路速度を十分に高め得る回路しゃ断器を提供する
ことにある。[Purpose of the Invention] Therefore, the purpose of the present invention is to provide a circuit breaker that can sufficiently increase the opening speed due to electromagnetic repulsion while reducing the weight by making one of the pair of movable contacts short. be.

［発明の概要］ 本発明は第１の可動接触子を従来通り長い形状物とし、
第２の可動接触子を可能な限り短い形状物とし、且つこ
の第２の可動接触子に電気的に接続される主回路導体に
この第２の可動接触子の支点側から第１の可動接触子と
略平行して延びる反発用固定導体部を形成する構成とし
、前記可動接触子間の電磁反発力の第２の可動接触子を
短くすることにより低下した分を上記反発用固定導体部
がもたらす電磁反発力により補い得るようにしたもので
ある。[Summary of the Invention] The present invention provides a first movable contact having a long shape as in the past;
The second movable contact is made as short as possible, and the first movable contact is connected to the main circuit conductor electrically connected to the second movable contact from the fulcrum side of the second movable contact. A fixed conductor for repulsion is configured to form a fixed conductor for repulsion extending substantially parallel to the second movable contact, and the fixed conductor for repulsion absorbs the electromagnetic repulsion between the movable contacts by an amount reduced by shortening the second movable contact. This can be compensated for by the electromagnetic repulsion that it brings.

［発明の実施例］ 以下本発明の一実施例について第１図乃至第４図を参照
しながら説明する。第１図において、２０は蓋２１を有
するケース、２２は回動フレームであり、この回動フレ
ーム２２はケース２０の両側壁間に回動自在に懸架され
たクロスパー２３に支持されこれを中心に回動する。２
４は一端に接点２５を固着した細長い第１の可動接触子
であり、その他端が回動フレーム２２に第１図と第３図
との比較から明らかなようにビン２６を介して回動自在
に連結されている。２７は引張りスプリングであり、こ
れは可動接触子２４の略中間に設けた突起２８と回動フ
レーム２２に設けた突起２９との間に張設され可動接触
子２４に閉路方向即ち図中反時計方向の回動力を付勢す
る。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, 20 is a case having a lid 21, and 22 is a rotating frame. Rotate. 2
4 is an elongated first movable contact having a contact 25 fixed to one end, and the other end is rotatable via a pin 26 attached to a rotating frame 22, as is clear from a comparison between FIGS. 1 and 3. is connected to. Reference numeral 27 denotes a tension spring, which is tensioned between a protrusion 28 provided approximately in the middle of the movable contact 24 and a protrusion 29 provided on the rotating frame 22, and is applied to the movable contact 24 in the closing direction, that is, counterclockwise in the figure. Apply rotational force in the direction.

主として第２図において、３０は一端に接点３１を固着
してなる第２の可動接触子で、前記第１の可動接触子２
４の下方に配設するために他端側がケース２０の底部に
立設された支持部材３２にビン３３を介して回動自在に
連結されている。またこの第２の可動接触子３０はこれ
自身に設けた突起３４と前記支持部材３２の一部との間
に張設された引張りスプリング３５により常時閉路方向
即ち時計方向に回動付勢される。このような第２の可動
接触子３０は極力短い形状に形成され、そ−してその接
点２５．３１間の閉路状態において前記第１の可動接触
子２４と平行に対向する配設構造をなす。Mainly in FIG. 2, reference numeral 30 denotes a second movable contact having a contact 31 fixed to one end, which is similar to the first movable contact 2.
4, the other end side is rotatably connected via a pin 33 to a support member 32 erected at the bottom of the case 20. Further, the second movable contact 30 is always urged to rotate in the closing direction, that is, in the clockwise direction, by a tension spring 35 stretched between a protrusion 34 provided on itself and a part of the support member 32. . The second movable contact 30 is formed to be as short as possible, and has a structure in which it faces parallel to the first movable contact 24 in the closed circuit state between the contacts 25 and 31. .

３６はケース２０の底面に固定された主回路導体で、そ
のケース２０に位置する一端が電源側端子３７とされ、
またケース２０内に位置する他端側には反発用固定導体
部３８が閉路状態にある第１の可動接触子２４中前記第
２の可動接触子３０とは対向しない残余部分と平行に対
向するように折曲手段により傾斜立上り状態に形成され
ている。36 is a main circuit conductor fixed to the bottom of the case 20, one end of which is located in the case 20 is a power supply side terminal 37;
Further, on the other end side located inside the case 20, a repulsion fixed conductor portion 38 faces in parallel with the remaining portion of the first movable contact 24 in the closed circuit state that does not face the second movable contact 30. It is formed into an inclined rising state by the bending means.

このようにしてこの反発用固定導体部３８は第２の可動
接触子３０の回動支点側から第１の可動接触子２４と略
平行に対向して延びる構造になっている。この反発用固
定導体部３８の先端と第２の可動接触子３０の回動支点
近傍との間は可撓導体３９により電気的に接続され、ま
た反発用固定導体部３８と前記回動フレーム２２との間
には絶縁物２０ａが介在されている。その他の部分は第
７図に示す従来構造と同一である。即ち、３９は消弧装
置、４０は第１の可動接触子２４と負荷側端子４１との
間に可撓導体４２．４３により接続された負荷側主回路
導体４４に伝熱的に取付けられたバイメタル式過電流引
外し装置である。また、４５はリンク機構４６を含むト
グル機構であり、これは過電流引外し装置４０内のバイ
メタル４７が過電流により変形したときラッチ４８とキ
ャッチ４９との係合を解きリンク機構４６により回動フ
レーム２２を開路方向（図示時計方向）にクロスパー２
３を中心に瞬時に回動させるようになっている。更にハ
ンドル５０は第１の可動接触子２４を第２の可動接触子
３０に対して手動開閉操作するためのものである。In this way, the repulsion fixed conductor portion 38 is structured to extend from the rotation fulcrum side of the second movable contact 30 to face the first movable contact 24 substantially in parallel. A flexible conductor 39 electrically connects the tip of the repulsion fixed conductor 38 and the vicinity of the rotation fulcrum of the second movable contact 30, and the repulsion fixed conductor 38 and the rotation frame 22 are electrically connected to each other by a flexible conductor 39. An insulator 20a is interposed between them. Other parts are the same as the conventional structure shown in FIG. That is, 39 is an arc extinguishing device, and 40 is thermally attached to the load-side main circuit conductor 44 connected between the first movable contactor 24 and the load-side terminal 41 by a flexible conductor 42.43. This is a bimetallic overcurrent trip device. Further, 45 is a toggle mechanism including a link mechanism 46, which releases the engagement between the latch 48 and the catch 49 when the bimetal 47 in the overcurrent tripping device 40 is deformed due to an overcurrent, and is rotated by the link mechanism 46. Cross par 2 in the frame 22 opening direction (clockwise direction in the figure)
It is designed to rotate instantly around point 3. Further, the handle 50 is used to manually open and close the first movable contact 24 with respect to the second movable contact 30.

次に上記構成の作用について説明する。第１図は通常の
閉路状態を示すもので、この状態において、負荷に短絡
事故を生ずると、このとき両回動接触子２４及び３０は
これらの間に逆向きに流れる短絡電流により電磁反発力
を生じ第３図に示すように互いに離反する方向に回動す
る。これにより両接点２５．３１間のアークが急速に引
きのばされ短絡電流が限流される。この動作に続いて過
電流引外し装置４０が動作してトグル機構４５により回
動フレーム２２が第３図の位置から第４図に示す位置へ
回動され、第１の可動接触子２４を開路状態に保持する
。Next, the operation of the above configuration will be explained. Figure 1 shows a normal closed circuit state. In this state, if a short circuit occurs in the load, both rotating contacts 24 and 30 will be subjected to electromagnetic repulsion due to the short circuit current flowing in opposite directions between them. , and rotate in directions away from each other as shown in FIG. As a result, the arc between both contacts 25, 31 is rapidly extended, and the short circuit current is limited. Following this operation, the overcurrent tripping device 40 operates, and the rotating frame 22 is rotated by the toggle mechanism 45 from the position shown in FIG. 3 to the position shown in FIG. 4, and the first movable contact 24 is opened. hold in state.

この装置によれば、第１の可動接触子２４を上方即ち開
路方向に回動させるための電磁反発力は第２の可動接触
子３０との間のみならず主回路導体３６に形成した反発
用固定導体部３８との間でも得られる。従って第２の可
動接触子３０を短い形状に小形化しても第１の可動接触
子２４に作用する電磁反発力は減少しない。この結果筒
２の可動接触子３０は反発用固定導体部３８の長さに相
応して短い形状になしても差支えな（、短くして軽量に
なった分開路速度が向上し、限流効果が向上する。According to this device, the electromagnetic repulsive force for rotating the first movable contact 24 upward, that is, in the opening direction, is generated not only between the first movable contact 24 and the second movable contact 30 but also due to the repulsive force formed on the main circuit conductor 36. It can also be obtained between the fixed conductor section 38. Therefore, even if the second movable contact 30 is downsized to a shorter shape, the electromagnetic repulsion force acting on the first movable contact 24 does not decrease. As a result, the movable contact 30 of the tube 2 may be shortened to correspond to the length of the repulsion fixed conductor 38. will improve.

また、第２の可動接触子３０が従来より短いため、その
回動支点（ビン３３）のケース２０の底面に対する高さ
位置を第７図との比較から明らかなように従来のそれよ
りも高くとれるので開路回動角が太き（なり、従ってア
ークの引きのばし量が増し、限流効果が更に向上する。In addition, since the second movable contact 30 is shorter than the conventional one, the height position of its rotation fulcrum (bin 33) relative to the bottom surface of the case 20 is higher than that of the conventional one, as is clear from the comparison with FIG. 7. Since the opening rotation angle becomes wider, the amount of arc extension increases, further improving the current limiting effect.

次に第５図に示す第２実施例のものは、電源側の主回路
導体５１中、第２の可動接触子３０と対向する部分の両
側に第２の可動接触子３０の長手方向に平行な立上り部
５１ａ、５１ｂを形成しそしてこれら両立上り部５１ａ
、５１ｂ間の導体を除去して開口部５１ｃとしたことを
特徴とする。Next, in the second embodiment shown in FIG. 5, in the main circuit conductor 51 on the power supply side, parallel to the longitudinal direction of the second movable contact 30 is provided on both sides of the portion facing the second movable contact 30. rising portions 51a and 51b are formed, and both rising portions 51a
, 51b is removed to form an opening 51c.

ところで第１図に示す構造の場合、主回路導体３６と第
２の可動接触子３０との間に逆向きの電流が流れこれら
の間に発生する電磁反発力が第２の可動接触子３０の開
路動作を妨げる方向に作用する。これにより第２の可動
接触子３０の開路速度が低下される虞がある。By the way, in the case of the structure shown in FIG. 1, a current flows in the opposite direction between the main circuit conductor 36 and the second movable contact 30, and the electromagnetic repulsion force generated between them causes the second movable contact 30 to Acts in a direction that prevents circuit opening. As a result, there is a possibility that the opening speed of the second movable contactor 30 may be reduced.

これに対してこの第２実施例によれば主回路導体５１中
第２の可動接触子３０と対向する部分は空間部５１０に
なっているので可動接触子３０の開路動作を妨げる電磁
反発力は生じなくなり、限流効果がより一層高くなる。On the other hand, according to the second embodiment, the part of the main circuit conductor 51 that faces the second movable contact 30 is a space 510, so that the electromagnetic repulsive force that prevents the circuit opening operation of the movable contact 30 is reduced. The current limiting effect becomes even higher.

第６図に示す第３実施例のものは電源側主回路導体５２
をその第２の可動接触子３０下部において平板状にする
と共にこの平板部５２ａ中上記可動接触子３０と対向す
る部分に開口部５２ｂを形成し、これにより可動接触子
３０の開路動作を妨げるような電磁反発力の発生を防止
したものである。尚、第５図及び第６図中、第２図と同
一部分には同一符号を付した。The third embodiment shown in FIG. 6 has a main circuit conductor 52 on the power supply side.
is formed into a flat plate shape at the lower part of the second movable contact 30, and an opening 52b is formed in the flat plate portion 52a at a portion facing the movable contact 30, thereby preventing the circuit opening operation of the movable contact 30. This prevents the generation of electromagnetic repulsion. In FIGS. 5 and 6, the same parts as in FIG. 2 are given the same reference numerals.

［発明の効果］ 本発明は以上述べたように、互の間の電磁反発力を生ず
るように上下に対向する第１及び第２の可動接触子のう
ち、下方側の第２の可動接触子を短い形状にすると共に
、主回路導体に第２の可動接触子の回動支点側から前記
第１の可動接触子と略平行して伸びる反発用固定導体部
を形成したことにより、第２の可動接触子が軽量になり
、しかも電磁反発力が減少せず限流効果の高いしゃ断が
可能になる回路しゃ断器を提供することができる。[Effects of the Invention] As described above, the present invention provides the lower second movable contact among the first and second movable contacts that face each other vertically so as to generate electromagnetic repulsion between them. By making the shape short and forming a repulsion fixed conductor portion extending from the rotation fulcrum side of the second movable contact in substantially parallel to the first movable contact on the main circuit conductor, the second It is possible to provide a circuit breaker in which a movable contact is lightweight, and in addition, electromagnetic repulsion is not reduced and breaking can be performed with a high current limiting effect.

【図面の簡単な説明】[Brief explanation of drawings]

第１図乃至第４図は本発明の第１実施例を示すものであ
り、第１図は全体的な縦断側面図、第２図は第２の可動
接触子側の斜視図、第３図及び第４図は夫々穴なる作用
状態をもって示す要部の側面図、第５図は本発明の第２
実施例を示す第２の可動接触子側の斜視図、第６図は本
発明の第３実施例を示す第２の可動接触子側の斜視図、
第７図は従来例を示す第１図相当図である。 図中、２２は回動フレーム、２４は第１の可動接触子、
３０は第２の可動接触子、３６は主回路導体、３８は反
発用固定導体部、５１は主回路溝一体、５２は主回路導
体である。 出願人　　株式会社　　東　　芝 第　１　口 第　２　口 第　３　図 ｙＡ　４　図 第　５　図 第　６　図 第　７　図1 to 4 show a first embodiment of the present invention, in which FIG. 1 is an overall vertical side view, FIG. 2 is a perspective view of the second movable contact, and FIG. 3 is a perspective view of the second movable contact. and FIG. 4 are side views of the main parts shown in the operating state of holes, respectively, and FIG.
FIG. 6 is a perspective view of the second movable contact side showing the third embodiment of the present invention;
FIG. 7 is a diagram corresponding to FIG. 1 showing a conventional example. In the figure, 22 is a rotating frame, 24 is a first movable contact,
30 is a second movable contact, 36 is a main circuit conductor, 38 is a fixed conductor for repulsion, 51 is an integrated main circuit groove, and 52 is a main circuit conductor. Applicant: Toshiba Corporation Part 1 Part 2 Part 3 Figure yA 4 Figure 5 Figure 6 Figure 7

Claims (1)

【特許請求の範囲】[Claims] １、過電流検出時に引外し装置により閉路位置から開路
位置に変位される第１の可動接触子と、閉路位置にある
前記第１の可動接触子に常時接触するように付勢された
第２の可動接触子とを備え、事故電流に基づき前記両可
動接触子間に生ずる電磁反発力により前記第１の可動接
触子と前記第２の可動接触子とを互に離反させるように
したものにおいて、前記第２の可動接触子に電気的に接
続される主回路導体にこの第２の可動接触子の回動支点
側から前記第１の可動接触子と略平行してのびる反発用
固定導体部を形成したことを特徴とする回路しや断器。1. A first movable contact that is displaced from a closed circuit position to an open circuit position by a tripping device when an overcurrent is detected, and a second movable contact that is energized so as to be in constant contact with the first movable contact that is in the closed circuit position. a movable contact, and the first movable contact and the second movable contact are separated from each other by an electromagnetic repulsion force generated between the two movable contacts based on a fault current. , a repulsion fixed conductor portion extending substantially parallel to the first movable contact from the rotation fulcrum side of the second movable contact to the main circuit conductor electrically connected to the second movable contact; A circuit breaker characterized by forming a circuit.