JP5084982B1 - Circuit breaker for DC circuit and circuit breaker for DC circuit - Google Patents

Circuit breaker for DC circuit and circuit breaker for DC circuit Download PDF

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JP5084982B1
JP5084982B1 JP2012531574A JP2012531574A JP5084982B1 JP 5084982 B1 JP5084982 B1 JP 5084982B1 JP 2012531574 A JP2012531574 A JP 2012531574A JP 2012531574 A JP2012531574 A JP 2012531574A JP 5084982 B1 JP5084982 B1 JP 5084982B1
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circuit breaker
circuit
arc
insulator
grid plate
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JPWO2013171903A1 (en
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伸郎 三好
征浩 伏見
悠太 小樋
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/345—Mounting of arc chutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective 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
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts
    • H01H2009/365—Metal parts using U-shaped plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/302—Means for extinguishing or preventing arc between current-carrying parts wherein arc-extinguishing gas is evolved from stationary parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
    • H01H9/36—Metal parts
    • H01H9/362—Mounting of plates in arc chamber

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  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

直流回路用回路遮断器の消弧装置における複数のグリッド板には、可動接触子側にＵ字形の切欠部と切欠部の両側の側足部が形成され、前記グリッド板間には、前記グリッド板の積層方向に隙間なく樹脂製の絶縁体が配置され、前記絶縁体には前記グリッド板のＵ字形の切欠部と対向するＵ字形の切欠部が形成されると共に、前記グリッド板の側足部における前記グリッド板の切欠部側側面が露出するよう形成されたものである。これにより、磁石を使用せず、アーク駆動力が小さい小電流領域のアーク電圧を上げることができ、高電圧の直流回路を遮断できる。
【選択図】図３The plurality of grid plates in the arc-extinguishing device of the circuit breaker for DC circuit are formed with U-shaped notches on the movable contact side and side feet on both sides of the notches, and between the grid plates, the grid A resin insulator is disposed in the stacking direction of the plates without any gap, and a U-shaped cutout portion is formed on the insulator to face the U-shaped cutout portion of the grid plate. It is formed so that the notch part side surface of the grid plate in the part is exposed. Thereby, without using a magnet, the arc voltage in a small current region with a small arc driving force can be increased, and a high-voltage DC circuit can be cut off.
[Selection] Figure 3

Description

本発明は、消弧装置の消弧板（グリッド板）間に樹脂を入れることで、アーク電圧を高めることができる直流回路用回路遮断器及び直流回路用回路遮断装置に関するものである。   The present invention relates to a circuit breaker for a DC circuit and a circuit breaker for a DC circuit that can increase an arc voltage by putting resin between arc extinguishing plates (grid plates) of the arc extinguishing device.

交流電路用と直流電路用を共用化した回路遮断器は、これを直流電路に用いた場合、直流電流は電流零点を持たないことから、高い電圧を遮断することが交流電路に比べ困難である。通電電流が大電流領域（例えば、定格電流が１００Ａを超えるもの）の回路遮断器については、消弧板の枚数増加によるアーク電圧向上と、消弧板側の磁気抵抗低減による磁気駆動力のアップと、消弧性のガスを発生する絶縁部材をアーク周辺に配設しそのガスの圧力勾配により消弧板側へアークを駆動するガス駆動力とにより、永久磁石がなくても直流の定格電圧を上げ高電圧化を図ることができる。   A circuit breaker that is used for both AC and DC circuits is difficult to cut off high voltage compared to AC circuits because DC current does not have a current zero when DC circuit is used. . For circuit breakers with a large current range (for example, rated current exceeding 100A), the arc voltage is improved by increasing the number of arc extinguishing plates, and the magnetic driving force is increased by reducing the magnetic resistance on the arc extinguishing plate side. In addition, an insulating member that generates arc-extinguishing gas is arranged around the arc, and the gas driving force that drives the arc toward the arc-extinguishing plate by the pressure gradient of the gas enables a DC rated voltage without a permanent magnet. To increase the voltage.

しかし、通電電流が小電流領域（例えば、定格電流が１００Ａ以下）の回路遮断器では、電流が小さく前述の消弧板による磁気駆動力及びガスの圧力勾配によるガス駆動力が小さいので、永久磁石を両接点の近傍の両側に配置し、フレミングの法則を利用した永久磁石の磁力により、遮断時のアークを消弧装置のグリッド板側へ駆動することが一般的である（例えば、特許文献１参照）。一方、遮断時の限流性能向上を目的として、グリッド板と絶縁性板を交互に互いに離間された状態で支持されている消弧装置が知られている（例えば、特許文献２参照）。   However, in a circuit breaker in which the energization current is a small current region (for example, rated current is 100 A or less), the current is small, and the magnetic driving force by the arc extinguishing plate and the gas driving force by the gas pressure gradient are small. Are arranged on both sides in the vicinity of both contacts, and the arc at the time of interruption is driven to the grid plate side of the arc extinguishing device by the magnetic force of a permanent magnet using Fleming's law (for example, Patent Document 1). reference). On the other hand, there is known an arc extinguishing device in which a grid plate and an insulating plate are supported alternately separated from each other for the purpose of improving current limiting performance at the time of interruption (see, for example, Patent Document 2).

実開昭５８−１８８９１７号公報Japanese Utility Model Publication No. 58-188917 特開昭５８−１８１２３５号公報JP 58-181235 A

前述のように従来の回路遮断器では、直流電路の高電圧化を図る場合、小電流領域において電流が小さいことから、グリッド板への磁気駆動力が弱くなり、グリッド板が露出している部分までアークが到達しないので、アークに触れた絶縁部材から出る冷却ガスによるアーク電圧上昇分とアークに触れた絶縁部材による圧力勾配にて発生したアーク駆動力は期待できるが、グリッド板にてアークが分断され発生するアーク電圧上昇分が十分期待できない。そのため、直流電路における高電圧化は難しくなり、永久磁石に頼る必要があった。   As described above, in the conventional circuit breaker, when increasing the voltage of the DC circuit, since the current is small in the small current region, the magnetic driving force to the grid plate becomes weak and the grid plate is exposed. Since the arc does not reach the arc, the arc driving force generated by the arc voltage rise due to the cooling gas coming out of the insulating member touching the arc and the pressure gradient due to the insulating member touching the arc can be expected, but the arc is generated by the grid plate. It is not possible to expect a sufficient increase in the arc voltage that occurs due to the division. Therefore, it is difficult to increase the voltage in the DC circuit, and it has been necessary to rely on permanent magnets.

本発明は、前述のような課題を解決するためになされたもので、小電流アークにおいて磁石を使用せず、高電圧の直流回路を遮断できる直流回路用回路遮断器及び直流回路用回路遮断装置を得ることを目的とするものである。   The present invention has been made in order to solve the above-described problems. A circuit breaker for a DC circuit and a circuit breaker for a DC circuit that can interrupt a high-voltage DC circuit without using a magnet in a small current arc. The purpose is to obtain.

本発明の直流回路用回路遮断器は、筺体のベースと、このベース上に間隔をおいて配置された外部端子と、前記外部端子の一方に接続され固定接点を有する固定接触子と、前記固定接点と接離する可動接点を有し前記外部端子の他方に接続された可動接触子と、前記両接点及び前記固定接触子の近傍に設けられ、複数のグリッド板が積層され前記両接点間に発生したアークを消弧する消弧装置とを備え、前記グリッド板には、前記可動接触子側にＵ字形の切欠部と前記切欠部の両側の側足部が形成されている回路遮断器であって、前記消弧装置のグリッド板間には、前記グリッド板の積層方向に隙間なく樹脂製の絶縁体が配置され、前記絶縁体には前記グリッド板のＵ字形の切欠部と対向するＵ字形の切欠部が形成されると共に、前記グリッド板の側足部における前記グリッド板の切欠部側側面が露出するよう形成されたものである。   The circuit breaker for a DC circuit of the present invention includes a base of a housing, an external terminal arranged on the base at an interval, a fixed contact connected to one of the external terminals and having a fixed contact, and the fixed A movable contact having a movable contact contacting and separating from the contact and connected to the other of the external terminals; and provided in the vicinity of both the contact and the fixed contact, and a plurality of grid plates are laminated between the contacts. An arc extinguishing device that extinguishes the generated arc, and the grid plate is a circuit breaker in which a U-shaped cutout portion and side foot portions on both sides of the cutout portion are formed on the movable contact side. And between the grid plates of the arc-extinguishing apparatus, resin insulators are arranged without gaps in the grid plate stacking direction, and the U-shaped notch portions of the grid plates are opposed to the insulators. A letter-shaped notch is formed and the grip In which notch side surface of the grid plate at the side legs of the plate is formed so as to expose.

本発明に係わる直流回路用回路遮断器によれば、前記絶縁体を追加することで、磁石を使用せず、アーク駆動力が小さい小電流領域のアーク電圧を上げることができ、高電圧の直流回路を遮断できる。本発明の上記以外の目的、特徴、観点及び効果は、図面を参照する以下の本発明の詳細な説明から、さらに明らかになるであろう。   According to the circuit breaker for a DC circuit according to the present invention, by adding the insulator, it is possible to increase the arc voltage in a small current region where the arc driving force is small without using a magnet, and a high voltage DC The circuit can be shut off. Other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention with reference to the drawings.

本発明の実施の形態１における直流回路用回路遮断器の全体構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the whole structure of the circuit breaker for DC circuits in Embodiment 1 of this invention. 図１の消弧装置を示す拡大斜視図である。It is an expansion perspective view which shows the arc-extinguishing apparatus of FIG. 図１の消弧装置を示す拡大側面断面図である。It is an expanded side sectional view which shows the arc-extinguishing apparatus of FIG. 図２から可動接触子を取り除いた消弧装置を示す拡大斜視図である。It is an expansion perspective view which shows the arc-extinguishing apparatus which removed the movable contact from FIG. 図４から絶縁部材を取り除いた消弧装置を示す拡大斜視図である。It is an expansion perspective view which shows the arc-extinguishing apparatus which removed the insulating member from FIG. 実施の形態１におけるグリッド板を示す拡大図である。FIG. 3 is an enlarged view showing a grid plate in the first embodiment. 実施の形態１における絶縁体を示す拡大図である。4 is an enlarged view showing an insulator in Embodiment 1. FIG. 実施の形態１におけるアークの磁気駆動を説明する図である。6 is a diagram for explaining magnetic driving of an arc in the first embodiment. FIG. 本発明の実施の形態２における絶縁体を示す拡大図である。It is an enlarged view which shows the insulator in Embodiment 2 of this invention. 実施の形態１，２の外部結線図である。FIG. 3 is an external connection diagram of the first and second embodiments. 実施の形態３の外部結線図である。FIG. 10 is an external connection diagram of the third embodiment. 実施の形態４の外部結線図である。FIG. 10 is an external connection diagram of the fourth embodiment.

実施の形態１．
図１は本発明の実施の形態１における直流回路用回路遮断器の全体構成を示す縦断面図である。図１に示すように、回路遮断器１０１は、絶縁材料で形成されたベース１１とカバー１２とからなる筐体１０を用いて構成される。ベース１１上には、（１又は複数）極数分の回路遮断ユニット２０が互いに間隔をおいて配列される。回路遮断ユニット２０の上部には、周知のトグルリンク機構を有する開閉機構部３０が配置される。カバー１２は、ベース１１上の各極の回路遮断ユニット２０と、開閉機構部３０を覆い、開閉機構部３０の操作ハンドル３１はカバー１２のハンドル用窓孔１２ａから突出している。Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing the overall configuration of a DC circuit breaker according to Embodiment 1 of the present invention. As shown in FIG. 1, the circuit breaker 101 is configured by using a housing 10 including a base 11 and a cover 12 made of an insulating material. On the base 11, circuit breaker units 20 corresponding to the number of (one or more) poles are arranged at intervals. An opening / closing mechanism 30 having a well-known toggle link mechanism is disposed on the circuit breaking unit 20. The cover 12 covers the circuit breaker unit 20 of each pole on the base 11 and the opening / closing mechanism 30, and the operation handle 31 of the opening / closing mechanism 30 protrudes from the handle window hole 12 a of the cover 12.

各極の回路遮断ユニット２０は、互いに同じに構成され、クロスバー３２は、各極の回路遮断ユニット２０に共通して、各極の回路遮断ユニット２０に直交するように、ベース１１上に配置される。このクロスバー３２は、開閉機構部３０により、その軸心を中心として回動され、各極の回路遮断ユニット２０における各可動接触子２３がそれぞれ取り付けられる。クロスバー３２がその軸心を中心として回動したときに、各極の回路遮断ユニット２０の各可動接触子２３が同時に回動され、この可動接触子２３の回動により、可動接点２２が固定接点２１と接離する。開閉機構部３０は、周知のトグルリンク機構からなり、引き外し装置４０により駆動される周知のトリップバー３３を備えている。   The circuit breaker units 20 for each pole are configured in the same manner, and the crossbar 32 is arranged on the base 11 so as to be orthogonal to the circuit breaker unit 20 for each pole in common with the circuit breaker unit 20 for each pole. Is done. The cross bar 32 is rotated about its axis by the opening / closing mechanism 30 and each movable contact 23 in the circuit breaker unit 20 of each pole is attached. When the cross bar 32 rotates about its axis, the movable contacts 23 of the circuit breaker unit 20 of each pole are simultaneously rotated, and the movable contact 22 is fixed by the rotation of the movable contact 23. It contacts and separates from the contact 21. The opening / closing mechanism 30 includes a known toggle link mechanism, and includes a known trip bar 33 driven by the tripping device 40.

各極の回路遮断ユニット２０は、ベース１１に設けられた電源側端子（外部端子）２４と、この電源側端子２４より延設された固定接触子２７に設けられた固定接点２１と、この固定接点２１と接離する可動接点２２と、この可動接点２２が一端に設けられ、クロスバー３２により回動自由に保持されている可動接触子２３と、この可動接触子２３に可動接触子ホルダー２６を介して接続された引き外し装置４０と、引き外し装置４０より延設された負荷側端子（外部端子）２５と、固定接触子２７及び両接点２１，２２の近傍に設けられ、両接点２１，２２間に発生したアークを消弧する消弧装置５０と、を有する。固定接点２１と可動接点２２とで、電路を開閉する開閉接点を構成する。可動接点２２が固定接点２１に接触すれば、端子２４、２５の間の電気回路がオンとなり、また、可動接点２２が固定接点２１から開離すれば、両端子２４、２５間の電気回路がオフとなる。このとき可動接点２２と固定接点２１間に生ずるアークは消弧装置５０により消弧される。   The circuit breaker unit 20 of each pole includes a power supply side terminal (external terminal) 24 provided on the base 11, a fixed contact 21 provided on a fixed contact 27 extending from the power supply side terminal 24, and this fixed A movable contact 22 that contacts and separates from the contact 21, a movable contact 23 provided at one end and rotatably held by a cross bar 32, and a movable contact holder 26 on the movable contact 23. The tripping device 40 connected via the tripping device, the load side terminal (external terminal) 25 extended from the tripping device 40, the fixed contact 27, and both the contacts 21, 22 are provided in the vicinity of the both contacts 21. And an arc extinguishing device 50 that extinguishes the arc generated between them. The fixed contact 21 and the movable contact 22 constitute an open / close contact that opens and closes the electric circuit. When the movable contact 22 comes into contact with the fixed contact 21, the electric circuit between the terminals 24 and 25 is turned on. When the movable contact 22 is separated from the fixed contact 21, the electric circuit between both the terminals 24 and 25 is turned on. Turn off. At this time, the arc generated between the movable contact 22 and the fixed contact 21 is extinguished by the arc extinguishing device 50.

図２は図１の消弧装置を示す拡大斜視図である。図３は図１の消弧装置を示す拡大側面断面図である。図４は図２から可動接触子を取り除いた消弧装置を示す拡大斜視図である。図５は図４から絶縁部材を取り除いた消弧装置を示す拡大斜視図である。図６はグリッド板を示す拡大図で、（ａ）は正面図、（ｂ）はその側面図である。図７は絶縁体を示す拡大図で、（ａ）は正面図、（ｂ）はその側面図である。   FIG. 2 is an enlarged perspective view showing the arc extinguishing apparatus of FIG. 3 is an enlarged side sectional view showing the arc extinguishing apparatus of FIG. FIG. 4 is an enlarged perspective view showing the arc extinguishing apparatus with the movable contact removed from FIG. FIG. 5 is an enlarged perspective view showing the arc extinguishing apparatus with the insulating member removed from FIG. FIG. 6 is an enlarged view showing the grid plate, where (a) is a front view and (b) is a side view thereof. FIG. 7 is an enlarged view showing an insulator, in which (a) is a front view and (b) is a side view thereof.

図２〜図７の実施の形態１に示すように、消弧装置５０を構成する磁性鋼板からなる複数のグリッド板５１及び最上段のグリッド板５２は、四角状板の一辺（可動接触子側）に略Ｕ字形の切欠部５１ａ，５２ａを設けた形状となっており、その切欠部５１ａ，５２ａの両側に側足部５１ｂが形成される。このグリッド板５１の複数枚と最上段のグリッド板５２の１枚を用い、所定の間隔を持って積層し、絶縁性の材料からなる支持板５３ａ，５３ｂに挟持させることにより消弧装置５０は構成されている。この消弧装置５０は、グリッド板５１及び最上段のグリッド板５２のＵ字形の切欠部５１ａ，５２ａが固定接点２１、可動接点２２の方向に向くように設置され、このＵ字形の切欠部５１ａにより形成される空間５０ａを可動接触子２３が回動する構成となっている。なお、最上段のグリッド板５２には、アークが可動接触子２３から転流し易いように折り曲げ部５２ｂが設けられている。   As shown in Embodiment 1 in FIGS. 2 to 7, the plurality of grid plates 51 and the uppermost grid plate 52 made of magnetic steel plates constituting the arc extinguishing device 50 are arranged on one side of the square plate (on the movable contact side). ) Are provided with substantially U-shaped cutout portions 51a and 52a, and side foot portions 51b are formed on both sides of the cutout portions 51a and 52a. The arc extinguishing device 50 is formed by using a plurality of grid plates 51 and one of the uppermost grid plates 52, stacking them at a predetermined interval, and sandwiching them between support plates 53a and 53b made of an insulating material. It is configured. The arc-extinguishing device 50 is installed such that the U-shaped cutout portions 51a and 52a of the grid plate 51 and the uppermost grid plate 52 face the fixed contact 21 and the movable contact 22, and the U-shaped cutout portion 51a. The movable contactor 23 rotates in the space 50a formed by the above. The uppermost grid plate 52 is provided with a bent portion 52b so that the arc can be easily commutated from the movable contactor 23.

両接点２１，２２及び消弧装置５０の近傍には、電源側端子２４を覆い、アークに触れたときに消弧性のガスを発生する樹脂（例えば、ポリアミド樹脂）からなる絶縁部材５５が設けられている。さらに、図３に示すように、消弧装置５０における複数のグリッド板５１及び最上段のグリッド板５２の間には樹脂製の絶縁体５４（例えば、ポリアミド樹脂又はポリアセタール樹脂）が、グリッド板の積層方向に隙間なく配置されており、グリッド板５１の側足部５１ｂにおけるクロスバー３２側の先端面５１ｄも絶縁体５４の曲げ部５４ｂで覆われている。一方、グリッド板５１の側足部５１ｂにおける空間５０ａ側（切欠部５１ａ側）の側面５１ｃは絶縁体５４で覆われておらず、アークに側足部５１ｂの側面５１ｂが触れるように露出している。また、この絶縁体５４は、図４〜７に示すように、グリッド板５１にあるＵ字形の切欠部５１ａと対向するＵ字形の切欠部５４ａが形成されており、繋ぎ部５４ｃにより１部品で構成されている。なお、グリッド板５１及び最上段のグリッド板５２の間のすべてに絶縁体５４を配置する必要はなく、必要なアーク電圧に応じて配置する枚数を変更すればよい。また、絶縁体５４には、その切欠部５４ａの反可動接触子側に、切欠部５４ａを延長しアークをグリッド板５１，５２の奥へ磁気駆動して誘導する切欠路５４ｄが形成されている。   In the vicinity of both the contacts 21 and 22 and the arc extinguishing device 50, an insulating member 55 made of a resin (for example, polyamide resin) that covers the power supply side terminal 24 and generates an arc extinguishing gas when it touches the arc is provided. It has been. Further, as shown in FIG. 3, a resin insulator 54 (for example, polyamide resin or polyacetal resin) is interposed between the plurality of grid plates 51 and the uppermost grid plate 52 in the arc extinguishing device 50. Arranged without gaps in the stacking direction, the front end surface 51 d on the side of the cross bar 32 in the side foot portion 51 b of the grid plate 51 is also covered with the bent portion 54 b of the insulator 54. On the other hand, the side surface 51c on the space 50a side (notch portion 51a side) of the side foot portion 51b of the grid plate 51 is not covered with the insulator 54, and is exposed so that the side surface 51b of the side foot portion 51b touches the arc. Yes. As shown in FIGS. 4 to 7, the insulator 54 has a U-shaped cutout portion 54a facing the U-shaped cutout portion 51a in the grid plate 51. The connecting portion 54c is used as a single component. It is configured. Note that it is not necessary to arrange the insulators 54 between the grid plate 51 and the uppermost grid plate 52, and the number of plates to be arranged may be changed according to the required arc voltage. Further, the insulator 54 is formed with a notch 54d that extends the notch 54a and magnetically drives the arc toward the back of the grid plates 51 and 52 on the side of the notch 54a opposite to the movable contact. .

次に回路遮断器１０１の遮断動作について説明する。所定値以上の電流が回路遮断ユニット２０に流れると、引き外し装置４０が回動し、トリップバー３３を押すことにより、開閉機構部３０が駆動され、可動接触子２３を回動させる。可動接触子２３の回動により固定接点２１から可動接点２２が開離する。可動接点２２が開離した際、流れる電流によるアークは、固定接点２１と可動接点２２間の最短距離で維持しようとする。   Next, the breaking operation of the circuit breaker 101 will be described. When a current greater than or equal to a predetermined value flows through the circuit breaker unit 20, the tripping device 40 rotates and pushes the trip bar 33 to drive the opening / closing mechanism 30 and rotate the movable contact 23. The movable contact 22 is separated from the fixed contact 21 by the rotation of the movable contact 23. When the movable contact 22 is separated, the arc caused by the flowing current tends to be maintained at the shortest distance between the fixed contact 21 and the movable contact 22.

このとき、直流の通電電流が大電流領域（例えば、定格電流が１００Ａを超えるもの）では、グリッド板５１に誘磁され、複数のグリッド板５１のＵ字形の切欠部５１ａを通過する磁束が、複数のグリッド板５１のＵ字形の切欠部５１ａで形成される空間の奥（図３において電源側端子２４の方向）へアークを磁気駆動する。また、アークの高熱により絶縁部材５５から発生する消弧性ガスでの圧力勾配にてアークは消弧板５１側へ駆動される。その後、消弧板５１側へ移動したアークは、複数のグリッド板５１により短いアークに分断され、その分断にて得られた陰極降下電圧によりアーク電圧が上昇する。このアーク電圧が電源電圧より高くなることでアークは消滅し、遮断が完了する。   At this time, in a large current region (for example, a rated current exceeding 100 A), the magnetic flux that is attracted to the grid plate 51 and passes through the U-shaped cutouts 51a of the plurality of grid plates 51, The arc is magnetically driven to the back of the space formed by the U-shaped cutouts 51a of the plurality of grid plates 51 (in the direction of the power supply side terminal 24 in FIG. 3). Further, the arc is driven to the arc extinguishing plate 51 side by the pressure gradient of the arc extinguishing gas generated from the insulating member 55 due to the high heat of the arc. Thereafter, the arc moved to the arc extinguishing plate 51 side is divided into short arcs by the plurality of grid plates 51, and the arc voltage is increased by the cathode fall voltage obtained by the division. When this arc voltage becomes higher than the power supply voltage, the arc disappears and the interruption is completed.

一方、直流の通電電流が小電流領域（例えば、定格電流が１００Ａ以下）では、アークによる磁気駆動力及び消弧性ガスの圧力勾配によるガス駆動力が弱くなるため、遮断できず、両接点２１，２２間の空間をアークが流れ続けようとする。一方、実施の形態１では、アークが樹脂に触れることで発生する冷却ガスによるアーク電圧上昇を利用するように、複数のグリッド板５１及び最上段のグリッド板５２の間に樹脂製の絶縁体５４を配置した。その形状は両接点２１と２２の間で発生したアークを、早い段階で消弧するために、グリッド板５１の側足部５１ｂの側面５１ｃをアークに触れやすいよう露出させている。これによりアークがグリッド板５１，５２に触れることで発生する陰極降下電圧を利用し、アーク電圧を上昇させる構成となっている。   On the other hand, when the direct current is small (for example, the rated current is 100 A or less), the magnetic driving force due to the arc and the gas driving force due to the pressure gradient of the arc-extinguishing gas are weakened and cannot be interrupted. , 22 keeps the arc flowing through the space. On the other hand, in the first embodiment, the resin insulator 54 is interposed between the plurality of grid plates 51 and the uppermost grid plate 52 so as to utilize the arc voltage increase caused by the cooling gas generated when the arc touches the resin. Arranged. In order to extinguish the arc generated between the contacts 21 and 22 at an early stage, the side surface 51c of the side foot portion 51b of the grid plate 51 is exposed so as to be easy to touch the arc. Thus, the arc voltage is increased by utilizing the cathode fall voltage generated when the arc touches the grid plates 51 and 52.

さらに、グリッド板５１，５２の間には絶縁体５４が、グリッド板の積層方向に隙間なく配置されているため、グリッド板５１，５２の数を減らすことなく、必要とするグリッド板５１，５２の数を確保することができ、アーク電圧を上昇させる構成となっている。さらにまた、グリッド板５１，５２と絶縁体５４との間に隙間があっては、ガスが電源側端子２４の方向に抜けてしまい圧力上昇が十分期待できないことを回避できる。ガス圧力を上げて、アークの径を絞ることで、アーク抵抗を上昇させ、電流を絞り遮断し易くする。次に絶縁体５４の曲げ部５４ｂの作用について説明する。図８はアークの磁気駆動を説明する図で、（ａ）は絶縁体５４の曲げ部５４ｂがない場合、（ｂ）は絶縁体５４の曲げ部５４ｂがある場合である。曲げ部５４ｂが絶縁体５４に無かったとすると、図８（ａ）に示すように、アーク５６はグリッド板５１の側足部５１ｂの先端面５１ｄに触れてしまう場合がある。そうすると、アーク５６の回りにできる磁束は、５６ａのようになり、片側の側足部５１ｂだけを通る磁束となる。そのためアーク５６をグリッド板５１の奥の方（紙面上左側）に駆動することができず、側足部５１ｂの先端面５１ｄの付近に留まってしまう。   Furthermore, since the insulator 54 is disposed between the grid plates 51 and 52 without gaps in the grid plate stacking direction, the required grid plates 51 and 52 are reduced without reducing the number of grid plates 51 and 52. Thus, the arc voltage is increased. Furthermore, if there is a gap between the grid plates 51 and 52 and the insulator 54, it can be avoided that the gas escapes in the direction of the power supply side terminal 24 and a sufficient increase in pressure cannot be expected. By increasing the gas pressure and reducing the diameter of the arc, the arc resistance is increased and the current is easily reduced and cut off. Next, the operation of the bent portion 54b of the insulator 54 will be described. 8A and 8B are diagrams for explaining the magnetic drive of the arc. FIG. 8A shows the case where the bent portion 54b of the insulator 54 is not provided, and FIG. 8B shows the case where the bent portion 54b of the insulator 54 is provided. If the bent portion 54b does not exist in the insulator 54, the arc 56 may touch the front end surface 51d of the side foot portion 51b of the grid plate 51 as shown in FIG. If it does so, the magnetic flux which can be made around the arc 56 will become like 56a, and will become a magnetic flux which passes only the side leg part 51b of one side. For this reason, the arc 56 cannot be driven to the back of the grid plate 51 (on the left side in the drawing), and remains in the vicinity of the front end surface 51d of the side foot 51b.

一方、曲げ部５４ｂにより側足部５１ｂの先端面５１ｄを覆っていると、アークは曲げ部５４ｂから発生するガスにより駆動され、側足部５１ｂの側面５１ｃ側に駆動される。そうすると、図８（ｂ）に示すように、アーク５６の回りにできる磁束は、５６ｂのようになり、両側の側足部５１ｂを通る磁束によりアーク５６をグリッド板５１の奥の方（紙面上左側、矢印Ａの方向）に駆動することができる。   On the other hand, when the distal end surface 51d of the side foot portion 51b is covered by the bent portion 54b, the arc is driven by the gas generated from the bent portion 54b and is driven to the side surface 51c side of the side foot portion 51b. Then, as shown in FIG. 8 (b), the magnetic flux that can be generated around the arc 56 becomes 56b. The magnetic flux that passes through the side foot portions 51b on both sides causes the arc 56 to move toward the back of the grid plate 51 (on the paper surface). It can be driven on the left side (in the direction of arrow A).

次に、回路遮断装置１０２を直流電路に結線する場合における直流電源６０及び負荷６１の接続について説明する。実施の形態１，２における外部結線図を示す図１０ように、回路遮断装置１０２が、２極品の場合は、直流電源６０を電源側端子２４ａ，２４ｂに、負荷６１を負荷側端子２５ａ，２５ｂに接続して、直列接続するだけでよい。なお、図１０では、直流電源６０の正側を電源側端子２４ａに、直流電源６０の負側を電源側端子２４ｂに接続しているが、逆でもかまわない。   Next, connection of the DC power supply 60 and the load 61 when the circuit breaker 102 is connected to the DC power circuit will be described. As shown in FIG. 10 showing the external connection diagram in the first and second embodiments, when the circuit breaker 102 is a two-pole product, the DC power supply 60 is used as the power supply terminals 24a and 24b, and the load 61 is used as the load terminals 25a and 25b. Just connect in series and connect in series. In FIG. 10, the positive side of the DC power source 60 is connected to the power source side terminal 24a, and the negative side of the DC power source 60 is connected to the power source side terminal 24b.

実施の形態１によれば、消弧装置のグリッド板間には、グリッド板の積層方向に隙間なく樹脂製の絶縁体が配置され、前記絶縁体にはグリッド板のＵ字形の切欠部と対向するＵ字形の切欠部が形成されると共に、前記グリッド板の側足部における前記グリッド板の切欠部側側面が露出するよう形成されたので、磁石を使用せず、アーク駆動力が小さい小電流領域のアーク電圧を上げることができ、高電圧直流回路を遮断することができる。   According to the first embodiment, a resin insulator is arranged between the grid plates of the arc extinguishing device without any gap in the stacking direction of the grid plates, and the insulator is opposed to the U-shaped notch portion of the grid plate. The U-shaped cutout portion is formed and the side face of the grid plate is exposed so that the side surface of the cutout portion side of the grid plate is exposed. The arc voltage in the region can be increased, and the high voltage DC circuit can be interrupted.

また、絶縁体には、曲げ部５４ｂを設けグリッド板の側足部の先端面を覆ったので、アークを効率的にグリッド板の奥の方に駆動でき、アーク駆動力が小さい小電流領域のアーク電圧を上げることができ、高電圧直流回路を遮断することができる。また、絶縁体５４の曲げ部５４ｂは、グリッド板間へ絶縁体５４を挿入する際に絶縁体５４の位置決めができ組み立て作業が容易になる。   In addition, since the bent portion 54b is provided in the insulator and covers the front end surface of the side foot portion of the grid plate, the arc can be efficiently driven toward the back of the grid plate, and the arc driving force is small in a small current region. The arc voltage can be increased and the high voltage DC circuit can be interrupted. Further, the bent portion 54b of the insulator 54 can position the insulator 54 when the insulator 54 is inserted between the grid plates, and the assembling work is facilitated.

実施の形態２．
図９は実施の形態２における絶縁体を示す拡大図で、（ａ）は正面図、（ｂ）はその側面図である。絶縁体５４は、特大電流遮断時（数ｋＡを超える電流）に発生する溶融物を外へ排出させるため、実施の形態１で設けていた繋ぎ部５４ａを排除した絶縁体５４で構成している。つまり、絶縁体５４の切欠部５４ａを延長しアークを誘導する切欠路５４ｄは、絶縁体５４の反可動接触子側まで達して、アーク電流を遮断するときに発生する溶融物や圧力を排出するように形成されている。これにより特大電流領域，大電流領域、小電流領域のすべての性能を満足する直流回路用回路遮断器を得ることができる。Embodiment 2. FIG.
FIG. 9 is an enlarged view showing an insulator in the second embodiment, where (a) is a front view and (b) is a side view thereof. The insulator 54 is composed of the insulator 54 excluding the connecting portion 54a provided in the first embodiment in order to discharge the melt generated when an extra large current is interrupted (current exceeding several kA). . That is, the notch 54d that extends the notch 54a of the insulator 54 and induces an arc reaches the non-movable contact side of the insulator 54 and discharges the melt and pressure generated when the arc current is interrupted. It is formed as follows. As a result, it is possible to obtain a circuit breaker for a DC circuit that satisfies all the performances in the extra large current region, the large current region, and the small current region.

実施の形態３．
図１１は実施の形態３における３極の直流回路用回路遮断装置を示す外部結線図である。図１０は、２極の直流回路用回路遮断装置の例であったが、実施の形態３では、実施の形態１，２と同じ回路遮断ユニット２０を３個用いて、３極の回路遮断装置１０３を構成したものである。なお、回路遮断ユニット２０については、実施の形態１，２と同様のため、説明を省略する。Embodiment 3 FIG.
FIG. 11 is an external connection diagram illustrating a circuit breaker for a three-pole DC circuit in the third embodiment. FIG. 10 shows an example of a circuit breaker for a two-pole DC circuit. In the third embodiment, three circuit breaker units 20 that are the same as those in the first and second embodiments are used. 103 is configured. Note that the circuit interruption unit 20 is the same as in the first and second embodiments, and thus the description thereof is omitted.

図１１に示すように電源側端子２４ａに直流電路６０の正側/負側を、電源側端子２４ｃに直流電路６０の負側/正側をそれぞれ接続し、さらに、負荷側端子２５ａと電源側端子２４ｂを接続する。負荷６１は、負荷側端子２５ｂに正側/負側を、負荷側端子２５ｃに負側/正側を接続する。なお、３線式の交流電路に用いる場合には、各電源側端子２４ａ，２４ｂ，２４ｃに電源を、各負荷側端子２５ａ，２５ｂ，２５ｃに負荷を接続すればよい。回路遮断装置１０３に示すように３点切りとなる直列配線により、さらに高い電圧の直流電路に適用できる。   As shown in FIG. 11, the positive side / negative side of the DC circuit 60 is connected to the power supply side terminal 24a, the negative side / positive side of the DC circuit 60 is connected to the power supply side terminal 24c, and the load side terminal 25a and the power supply side are connected. Terminal 24b is connected. The load 61 connects the positive side / negative side to the load side terminal 25b and the negative side / positive side to the load side terminal 25c. When used in a three-wire AC circuit, a power source may be connected to each power supply side terminal 24a, 24b, 24c, and a load may be connected to each load side terminal 25a, 25b, 25c. As shown in the circuit breaker 103, it can be applied to a DC circuit having a higher voltage by a series wiring that is cut at three points.

実施の形態４．
図１２は実施の形態４における４極の直流回路用回路遮断装置を示す外部結線図である。実施の形態４では、実施の形態１，２と同じ回路遮断ユニット２０を４個用いて、４極の回路遮断装置１０４を構成したものである。なお、回路遮断ユニット２０については、実施の形態１，２と同様のため、説明を省略する。Embodiment 4 FIG.
FIG. 12 is an external connection diagram illustrating a circuit breaker for a four-pole DC circuit in the fourth embodiment. In the fourth embodiment, four circuit breaker units 20 that are the same as those in the first and second embodiments are used to form a four-pole circuit breaker 104. Note that the circuit interruption unit 20 is the same as in the first and second embodiments, and thus the description thereof is omitted.

図１２に示すように、電源側端子２４ａに直流電路６０の正側/負側を、電源側端子２４ｄに直流電路６０の負側/正側をそれぞれ接続し、さらに、負荷側端子２５ａと電源側端子２４ｂを接続し、負荷側端子２５ｄと電源側端子２４ｃを接続する。負荷６１は、負荷側端子２５ｂに正側/負側を、負荷側端子２５ｃに負側/正側を接続する。なお、３相４線式の交流電路に用いる場合には、各電源側端子２４に電源を、各負荷側端子２５に負荷をそれぞれ接続する。回路遮断装置１０４を直流電路に適用する場合、図１２に示すように４点切りとなる直列配線により、さらに高い電圧の直流電路に適用できる。
なお、本発明は、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略することが可能である。As shown in FIG. 12, the positive / negative side of the DC circuit 60 is connected to the power supply terminal 24a, the negative / positive side of the DC circuit 60 is connected to the power supply terminal 24d, and the load terminal 25a and the power supply are connected. The side terminal 24b is connected, and the load side terminal 25d and the power supply side terminal 24c are connected. The load 61 connects the positive side / negative side to the load side terminal 25b and the negative side / positive side to the load side terminal 25c. When used in a three-phase four-wire AC circuit, a power source is connected to each power supply side terminal 24 and a load is connected to each load side terminal 25. When the circuit breaker 104 is applied to a DC circuit, the circuit breaker 104 can be applied to a DC circuit having a higher voltage by a series wiring that is cut at four points as shown in FIG.
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

Claims (6)

筺体のベースと、このベース上に間隔をおいて配置された外部端子と、前記外部端子の一方に接続され固定接点を有する固定接触子と、前記固定接点と接離する可動接点を有し前記外部端子の他方に接続された可動接触子と、前記両接点及び前記固定接触子の近傍に設けられ、複数のグリッド板が積層され前記両接点間に発生したアークを消弧する消弧装置とを備え、
前記グリッド板には、前記可動接触子側にＵ字形の切欠部と前記切欠部の両側の側足部が形成されている回路遮断器であって、
前記消弧装置のグリッド板間には、前記グリッド板の積層方向に隙間なく樹脂製の絶縁体が配置され、前記絶縁体には前記グリッド板のＵ字形の切欠部と対向するＵ字形の切欠部が形成されると共に、前記グリッド板の側足部における前記グリッド板の切欠部側側面が露出するよう形成されたことを特徴とする直流回路用回路遮断器。A base of the housing, an external terminal disposed on the base at an interval, a fixed contact connected to one of the external terminals and having a fixed contact, and a movable contact contacting and separating from the fixed contact A movable contact connected to the other of the external terminals, and an arc extinguishing device provided near the both contacts and the fixed contact, and a plurality of grid plates are laminated to extinguish an arc generated between the contacts. With
The grid plate is a circuit breaker in which a U-shaped cutout portion and side foot portions on both sides of the cutout portion are formed on the movable contact side,
Between the grid plates of the arc extinguishing device, a resin insulator is disposed without gaps in the grid plate stacking direction, and the insulator has a U-shaped notch facing the U-shaped notch of the grid plate. The circuit breaker for a DC circuit is formed so that a side surface of the grid plate is exposed at a side foot portion of the grid plate. 前記消弧装置のグリッド板間に配置された絶縁体には、前記グリッド板の側足部の先端面を被う曲げ部が形成されていることを特徴とする請求項１記載の直流回路用回路遮断器。  2. The DC circuit according to claim 1, wherein the insulator disposed between the grid plates of the arc extinguishing device is formed with a bent portion covering a tip surface of a side foot portion of the grid plate. Circuit breaker. 前記消弧装置のグリッド板間に配置された絶縁体には、前記絶縁体の切欠部の反可動接触子側に、前記絶縁体の切欠部を延長しアークを誘導する切欠路が形成されていることを特徴とする請求項１又は請求項２記載の直流回路用回路遮断器。  The insulator disposed between the grid plates of the arc extinguishing device is formed with a notch for extending the notch of the insulator and inducing an arc on the non-movable contact side of the notch of the insulator. 3. The circuit breaker for a DC circuit according to claim 1, wherein the circuit breaker is a DC circuit breaker. 前記絶縁体の切欠部を延長しアークを誘導する切欠路は、前記絶縁体の反可動接触子側まで達して、アーク電流を遮断するときに発生する溶融物や圧力を排出するように形成されている請求項３記載の直流回路用回路遮断器。  A notch path that extends the notch portion of the insulator and induces an arc is formed to reach the non-movable contact side of the insulator and discharge the melt and pressure generated when the arc current is interrupted. The circuit breaker for a DC circuit according to claim 3. 請求項１〜請求項４のいずれか１項記載の直流回路用回路遮断器を３極設け、これらの直流回路用回路遮断器を直列に配線して回路電圧を遮断できるよう構成した直流回路用回路遮断装置  A circuit breaker for a DC circuit according to any one of claims 1 to 4, wherein the circuit breaker for a DC circuit is provided with three poles, and the circuit breaker for these DC circuits is wired in series so that the circuit voltage can be cut off. Circuit breaker 請求項１〜請求項４のいずれか１項記載の直流回路用回路遮断器を４極設け、これらの直流回路用回路遮断器を直列に配線して回路電圧を遮断できるよう構成した直流回路用回路遮断装置。  The DC circuit breaker according to any one of claims 1 to 4, wherein the DC circuit breaker is provided with four poles, and the DC circuit breaker is wired in series to cut off the circuit voltage. Circuit breaker.
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