JP4138665B2 - Air circuit breaker - Google Patents

Air circuit breaker Download PDF

Info

Publication number
JP4138665B2
JP4138665B2 JP2003564894A JP2003564894A JP4138665B2 JP 4138665 B2 JP4138665 B2 JP 4138665B2 JP 2003564894 A JP2003564894 A JP 2003564894A JP 2003564894 A JP2003564894 A JP 2003564894A JP 4138665 B2 JP4138665 B2 JP 4138665B2
Authority
JP
Japan
Prior art keywords
contact
arc
fixed
movable
circuit breaker
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
Application number
JP2003564894A
Other languages
Japanese (ja)
Other versions
JPWO2003065396A1 (en
Inventor
広史 岡下
淳一 川上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of JPWO2003065396A1 publication Critical patent/JPWO2003065396A1/en
Application granted granted Critical
Publication of JP4138665B2 publication Critical patent/JP4138665B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01H9/342—Venting arrangements for arc chutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • 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
    • H01H9/52—Cooling of switch parts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/62—Heating or cooling of contacts
    • 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
    • H01H9/342—Venting arrangements for arc chutes
    • H01H2009/343—Venting arrangements for arc chutes with variable venting aperture function of arc chute internal pressure, e.g. resilient flap-valve or check-valve

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Breakers (AREA)

Description

技術分野
この発明は、気中遮断器の通常通電時における開閉接点と接点周辺通電導体の温度上昇の抑制に関するものである。
背景技術
第３図は、例えば日本国特開平５−３０３９３０号公報に記載された従来の気中遮断器の側断面図である。
図において、１はベース筐体であり、絶縁材料で形成された主ベース１ａと副ベース１ｂとから構成される。１ｃはベース筐体１に設けられたアークガスの放出窓である。２はカバー筐体、３は副ベース１ｂに該気中遮断器の極数個並設された固定導体であり、一端に固定接点４が固着され、他端はベース筐体１の外部へ導出されて電源側端子３ａを形成する。５は固定接点４に対向して離接する可動接点、６は可動接点５が固着された可動子、７は可動子６を回動可能に保持するコンタクトアーム、８は可動子６の不要部位への動きを阻止する可動子ストッパーピン、９はコンタクトアーム７をベース筐体１に支承するコンタクトアーム軸である。１０は端子導体であり、主ベース１ａに固定されベース筐体１に導出した部分は負荷側端子１０ａを形成する。１１は可動子６を端子導体１０に移動可能に接続する可撓導体である。
１２は可動子６を開離方向へ付勢する接圧バネ、１３は開閉機構部であり、軸１４によりコンタクトアーム７と連繋された可動子６を開閉させる。１５は引外しリレー部である。開閉機構部１３は周知のトグルリンク機構からなり、引外しリレー部１５に係合するＤ形ラッチ１６にて係止されている。１７は消弧装置であり、アークガス放出窓１ｃにより外部へアークガスを放出できるように開口している。１８は開閉機構部１３の投入駆動力が蓄勢される投入バネ、１９は投入バネ１８をハンドル２０または図示していないモータにより圧縮蓄勢するラチェット機構である。
このような気中遮断器は接続された負荷に過電流または事故等によるの過大電流を検知して引外しリレー部１５がＤ形ラッチ１６の係止を開放することで開閉機構部１３を作動させて、接圧バネ１２の力でもってコンタクトアーム７をコンタクトアーム軸９を中心に押し上げるとともに、可動子６は軸１４を中心に反時計方向に回動させて、固定接点４と可動接点５を開離させて両接点間の電流を遮断する。その際に接点間のアークは消弧装置１７に誘引され消弧され、このとき発生するアークガスはアークガス放出窓１ｃを通じて放出される。
このような気中遮断器は１千〜数千アンペアの定格電流であり、定格電流通電による温度上昇が各部の劣化を防ぐため通電部の上限温度が規格で定められている。上記のような従来の気中遮断器は、固定接点４と可動接点５及び可動子６等の周辺導電通路は通電充電部の絶縁と過大電流遮断時に発生するアークの遮蔽、及びアークガスの開閉機構部１３への漏出を防ぐためアークガス放出窓１ｃだけの閉塞空間に配置されているため、定格電流を通電時には固定接点４と可動接点５の接触抵抗及び可動子６等の周辺導電通路の抵抗による発熱が篭りベース筐体１の内部の温度上昇が大きくなり、通電部の上昇温度が規格上限温度を超えるという課題があった。
この発明は、かかる課題を解決するためになされたものであり、気中遮断器内部の熱を効果的に放散できるようにして気中遮断器内部の通電部の温度上昇を抑制することを目的としている。
発明の開示
この発明にかかる気中遮断器は、固定接点が固着された固定導体と、開閉機構により固定接点と接離する可動接点が固着された可動子と、上記両接点間に発生するアークを消弧する消弧装置とを筐体内に具備し、筐体の一部に設けられアークガスを筐体外へ放出する放出窓と、この放出窓に対向する部位に開口され筐体内部に空気通路を形成する通気穴とを設けたものである。
そして、上記のものに筐体内部の圧力上昇時には通気穴を閉塞する弁部材を設けたものである。
また。固定接点から導電及び伝熱可能に消弧装置側へ延在された固定側アーク接触子を備えるアークブロックと、両接点の開動作のときに固定側アーク接触子に接触する可動側アーク接触子を可動接点から導電及び伝熱可能に消弧装置側へ延在させて設けたものである。
そしてまた、１極の開閉を複数の可動子でもっておこない、この複数の可動子のそれぞれに可動側アーク接触子を消弧装置側へ延在させたものである。
発明を実施するための最良の形態
実施の形態１．
第１図はこの発明の実施の形態１を示す気中遮断器の要部断面図、第２図は実施の形態１の気中遮断器の通電部の透視斜視図である。
図において、１、３〜１３、１７は上記従来装置と同様なものでありその説明を省略する。１ｄは消弧装置１７とは反対側のベース筐体１に開口させた通気穴である。２１は通気穴１ｄの弁部材であり、常時はベース筐体１の外部から内部への通気は可能にして、ベース筐体１内部の圧力が上昇したときは通気穴１ｄを閉鎖する。６ａは可動子６の可動接点５の固着部から先端向けて可動子導体を延長して設けた可動側アーク接触子である。２２は固定導体３の消弧装置１７方向に取付けられたアークブロックであり、一面は固定導体３に、直交する他の一面はベース筐体１の底面にそれぞれ密着取付けされている。また、このアークブロック２２は可動側アーク接触子６ａと対向する位置に固定側アーク接触子２２ａを備えている。そして、第２図に示すように可動子６を複数並列にして１極の開閉部を構成している。また、アークブロック２２には可動側アーク接触子６ａと接触しない部位には凹溝２２ｂが設けられている。
このような気中遮断器は電源側端子３ａを上方にしての設置され、図示と同じように消弧装置１７側が上、通気穴１ｄが下に位置することになる。従って、通気穴１ｄとアークガスの放出窓１ｃ間に空気通路が形成される。
これにより、通電時の固定接点４と可動接点５の接触部及び可動子６等の周辺導電通路の発熱は通気穴１ｄからアークガス放出窓１ｃへ向けての自然対流による冷却がなされ、内部の温度上昇が抑制される。
また、通電電流遮断時には発生するアークガス圧により弁部材２１が通気穴１ｄを閉塞するので通気穴１ｄ下部の金属物へのアーク地絡を防止する。
次に、可動側アーク接触子６ａと固定側アーク接触子２２ａの作用について説明する。開閉機構部１３に連接する可動子６はオン・オフ時に揺動するようにコンタクトアーム７と可動子ピン８とコンタクトアーム軸９の位置関係となっている。オン動作の途上において最初に可動側アーク接触子６ａと固定側アーク接触子２２ａが当接して通電が開始される。開閉機構のさらなる押し込みでこの当接点が支点となり可動接点５と固定接点４が接触当接する。今度は可動接点５と固定接点４の接触面が支点となり押し込みが続けられるため、可動側アーク接触子６ａと固定側アーク接触子２２ａは開離して、通電電流は固定接点４と可動接点５との接触面を全て流れる。
電流遮断動作時は開閉機構の可動子６の引き上げに伴い可動接点５は固定接点４から僅かに開離され、両接点間はアークによる通電がなされる。そして可動子６は接圧バネ１２の押圧力により軸１４を中心に時計方向に回動されて可動側アーク接触子６ａは固定側アーク接触子２２ａに接触する。この時点で電流は両接点間のアーク電流と、可動側アーク接触子６ａと固定側アーク接触子２２ａとの接触点に並行して流れる。開閉機構のさらなる引き上げ動作により、可動側アーク接触子６ａと固定側アーク接触子２２ａの接触点は当接したまま、ここを支点に可動接点５と固定接点４は大きく開離され、接点間のアークは引き延ばされる。アークの引き延ばしにより、アーク抵抗が増大して電流の主流は可動側アーク接触子６ａと固定側アーク接触子２２ａの接触点へ移行する。開閉機構のさらなる開動作により可動側アーク接触子６ａと固定側アーク接触子２２ａの接触点が開離され、ここに発生するアークは消弧装置１７に誘引され消弧される。
以上のように、開閉時外の通常の通電状態には可動側アーク接触子６ａと固定側アーク接触子２２ａへは電流は流れないので、この部位での通電による発熱はない。しかし、接点部分からの熱伝導は可能であり、放熱面積を増大する効果がある。
主たる発熱部位である可動接点５と固定接点４の接触面と連なる可動側アーク接触子６ａとアークブロック２２は通気穴１ｄとアークガス放出窓１ｃ間の通気流路において、放熱部材として対流空気により冷却されるので、通電部の温度上昇を抑制する。
そして、１極の開閉部は可動側アーク接触子６ａを含む可動子６が複数並列に配設されているので、可動側アーク接触子６ａは全体として放熱面積を大きくする。また、アークブロック２２は凹溝２２ｂが通気方向に沿って設けられ放熱面積を大きくして放熱効果を高める。
固定側アーク接触子２２ａを構成するアークブロック２２は一面を固定導体３に、別の一面はベース筐体１の底面にそれぞれ密着取付けされているので、固定接点４の熱は固定導体３を経由してアークブロック２２に伝達され、上記の対流空気による放熱と、ベース筐体１の底面を通じての裏面からの外気への放熱が促進され、通電部の温度上昇を抑制する。このとき、ベース筐体１の底裏面を波状にして底裏面の放熱面積を増大させればさらに放熱効果を良好にすることができる。
産業上の利用可能性
以上のように本発明の気中遮断器は、固定接点が固着された固定導体と、固定接点と接離する可動接点が固着された可動子と、上記両接点間のアークを消弧する消弧装置とを筐体内に具備し、筐体の一部に設けられアークガスを筐体外へ放出する放出窓に対向する部位に開口された通気穴を設けているので、筐体内部に通気穴から放出窓への空気対流により接点及び接点周辺通電体が冷却され通電発熱による温度上昇が抑制される。
また、筐体内の圧力上昇時には通気穴を閉塞する弁部材を設けているので、弁部材が事故電流遮断時のアークガスの通気穴からの噴出しを阻止する。
そして、固定接点から導電及び伝熱可能に延在された固定側アーク接触子を備えるアークブロックと、可動側アーク接触子を可動接点から導電及び伝熱可能に延在して設けたので、通常の接点閉成状態において通電のないアークブロックと可動側アーク接触子は放熱面積を増加させ冷却を効果的に行うことができる。
また、１極の開閉を複数の可動子として、この複数の可動子のそれぞれに可動側アーク接触子を延在させたので、全ての可動側アーク接触子は放熱フィンになり、より放熱面積を増加させることができる。従って、該気中遮断器の通電部の上昇温度を規格上限温度以内に抑制することができる。
【図面の簡単な説明】
第１図はこの発明を示す気中遮断器の要部断面図である。
第２図はこの発明の気中遮断器の通電部の透視斜視図である。
第３図は従来の気中遮断器の側断面図である。TECHNICAL FIELD The present invention relates to suppression of temperature rise of switching contacts and contact peripheral conducting conductors during normal energization of an air circuit breaker.
Background Art FIG. 3 is a side sectional view of a conventional air circuit breaker described in, for example, Japanese Patent Application Laid-Open No. 5-303930.
In the figure, reference numeral 1 denotes a base housing, which is composed of a main base 1a and a sub base 1b formed of an insulating material. 1 c is an arc gas discharge window provided in the base casing 1. 2 is a cover housing, 3 is a fixed conductor arranged in parallel with the sub-base 1b and several poles of the air circuit breaker. A fixed contact 4 is fixed to one end, and the other end is led out of the base housing 1. Thus, the power supply side terminal 3a is formed. Reference numeral 5 denotes a movable contact that contacts and separates from the fixed contact 4, reference numeral 6 denotes a movable element to which the movable contact 5 is fixed, reference numeral 7 denotes a contact arm that rotatably holds the movable element 6, and reference numeral 8 denotes an unnecessary portion of the movable element 6. A mover stopper pin 9 for preventing the movement of the contact arm 9 is a contact arm shaft for supporting the contact arm 7 on the base housing 1. Reference numeral 10 denotes a terminal conductor, and a portion fixed to the main base 1a and led to the base casing 1 forms a load side terminal 10a. Reference numeral 11 denotes a flexible conductor that movably connects the movable element 6 to the terminal conductor 10.
Reference numeral 12 denotes a contact pressure spring that urges the movable element 6 in the opening direction, and 13 denotes an opening / closing mechanism. The movable element 6 connected to the contact arm 7 is opened and closed by a shaft 14. Reference numeral 15 denotes a trip relay unit. The opening / closing mechanism portion 13 is formed of a well-known toggle link mechanism, and is locked by a D-type latch 16 that engages the tripping relay portion 15. Reference numeral 17 denotes an arc extinguishing device, which is opened by an arc gas discharge window 1c so that arc gas can be discharged to the outside. Reference numeral 18 denotes a closing spring in which the closing driving force of the opening / closing mechanism 13 is stored. Reference numeral 19 denotes a ratchet mechanism that compresses and stores the closing spring 18 by a handle 20 or a motor (not shown).
Such an air circuit breaker detects the overcurrent or excessive current due to an accident or the like in the connected load, and the tripping relay unit 15 opens the D-type latch 16 to operate the opening / closing mechanism unit 13. Then, the contact arm 7 is pushed up about the contact arm shaft 9 by the force of the contact pressure spring 12, and the movable element 6 is rotated counterclockwise about the shaft 14 so that the fixed contact 4 and the movable contact 5 are rotated. Is opened to cut off the current between both contacts. At this time, the arc between the contacts is attracted by the arc extinguishing device 17 and extinguished, and the arc gas generated at this time is emitted through the arc gas discharge window 1c.
Such an air circuit breaker has a rated current of 1,000 to several thousand amperes, and the upper limit temperature of the energized part is defined by the standard in order to prevent a temperature rise caused by energization of the rated current from deteriorating each part. In the conventional air circuit breaker as described above, the peripheral conductive passages such as the fixed contact 4, the movable contact 5, and the mover 6 are insulated from the energized charging portion, shielded from arcs generated when an excessive current is interrupted, and an arc gas switching mechanism. In order to prevent leakage to the portion 13, it is disposed in the closed space of only the arc gas discharge window 1c, so that when the rated current is applied, it depends on the contact resistance of the fixed contact 4 and the movable contact 5 and the resistance of the peripheral conductive path such as the mover 6. There was a problem that heat generation increased and the temperature inside the base housing 1 increased, and the temperature rise of the current-carrying part exceeded the standard upper limit temperature.
The present invention has been made in order to solve such a problem, and an object of the present invention is to suppress the temperature rise of the current-carrying part inside the air circuit breaker by effectively dissipating the heat inside the air circuit breaker. It is said.
DISCLOSURE OF THE INVENTION An air circuit breaker according to the present invention includes a fixed conductor to which a fixed contact is fixed, a mover to which a movable contact that contacts and separates from the fixed contact by an opening / closing mechanism, and an arc generated between the two contacts. An arc extinguishing device that extinguishes the arc, a discharge window that is provided in a part of the casing and discharges arc gas to the outside of the casing, and an air passage that opens at a portion facing the discharge window and passes through the interior of the casing Ventilation holes are formed.
In addition, a valve member that closes the vent hole when the pressure inside the housing rises is provided in the above-described one.
Also. An arc block having a fixed-side arc contact extended from the fixed contact to the arc-extinguishing device so as to be able to conduct and transfer heat, and a movable-side arc contact that contacts the fixed-side arc contact when both contacts are opened Is extended from the movable contact to the arc extinguishing device side so as to be able to conduct and transfer heat.
Further, one pole is opened and closed by a plurality of movers, and a movable-side arc contact is extended to the arc-extinguishing device side of each of the plurality of movers.
BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1
FIG. 1 is a cross-sectional view of a main part of an air circuit breaker showing Embodiment 1 of the present invention, and FIG. 2 is a perspective view of a current-carrying part of the air circuit breaker of Embodiment 1.
In the figure, reference numerals 1, 3 to 13 and 17 are the same as those of the conventional apparatus described above, and the description thereof is omitted. Reference numeral 1 d denotes a vent hole opened in the base casing 1 on the side opposite to the arc extinguishing device 17. Reference numeral 21 denotes a valve member for the ventilation hole 1d, which normally allows ventilation from the outside to the inside of the base casing 1, and closes the ventilation hole 1d when the pressure inside the base casing 1 rises. Reference numeral 6a denotes a movable-side arc contact provided by extending a movable conductor from the fixed portion of the movable contact 5 of the movable element 6 toward the tip. An arc block 22 is attached in the direction of the arc extinguishing device 17 of the fixed conductor 3, and one surface is closely attached to the fixed conductor 3 and the other orthogonal surface is closely attached to the bottom surface of the base housing 1. The arc block 22 includes a fixed-side arc contact 22a at a position facing the movable-side arc contact 6a. As shown in FIG. 2, a plurality of movers 6 are arranged in parallel to form a one-pole opening / closing section. Further, the arc block 22 is provided with a concave groove 22b at a portion not in contact with the movable-side arc contact 6a.
Such an air circuit breaker is installed with the power supply side terminal 3a facing upward, and the arc extinguishing device 17 side is located on the upper side and the vent hole 1d is located on the lower side, as shown. Accordingly, an air passage is formed between the vent hole 1d and the arc gas discharge window 1c.
As a result, the heat generated in the contact portions between the fixed contact 4 and the movable contact 5 and the peripheral conductive passages such as the movable element 6 when energized is cooled by natural convection from the vent hole 1d toward the arc gas discharge window 1c, and the internal temperature The rise is suppressed.
Further, since the valve member 21 closes the vent hole 1d by the arc gas pressure generated when the energization current is cut off, an arc ground fault to the metal object below the vent hole 1d is prevented.
Next, the operation of the movable side arc contact 6a and the fixed side arc contact 22a will be described. The mover 6 connected to the opening / closing mechanism 13 is in a positional relationship of the contact arm 7, the mover pin 8, and the contact arm shaft 9 so as to swing when turned on / off. In the course of the ON operation, first, the movable side arc contact 6a and the fixed side arc contact 22a come into contact with each other and energization is started. When the opening / closing mechanism is further pushed in, this contact point becomes a fulcrum, and the movable contact 5 and the fixed contact 4 come into contact contact. In this case, since the contact surface of the movable contact 5 and the fixed contact 4 becomes a fulcrum and the push-in is continued, the movable side arc contact 6a and the fixed side arc contact 22a are separated, and the energization current is changed between the fixed contact 4 and the movable contact 5. All of the contact surface flows.
During the current interruption operation, the movable contact 5 is slightly separated from the fixed contact 4 as the movable member 6 of the opening / closing mechanism is pulled up, and an electric current is applied between the two contacts by an arc. The movable element 6 is rotated clockwise around the shaft 14 by the pressing force of the contact pressure spring 12, and the movable-side arc contact 6a comes into contact with the fixed-side arc contact 22a. At this time, the current flows in parallel to the arc current between the two contacts and the contact point between the movable side arc contact 6a and the fixed side arc contact 22a. By further lifting operation of the opening / closing mechanism, the movable contact 5 and the fixed contact 4 are largely separated from each other with the contact point between the movable arc contact 6a and the fixed arc contact 22a kept in contact with each other. The arc is stretched. By extending the arc, the arc resistance increases and the main current flows to the contact point between the movable arc contact 6a and the fixed arc contact 22a. By further opening operation of the opening / closing mechanism, the contact point of the movable side arc contact 6a and the fixed side arc contact 22a is separated, and the generated arc is attracted to the arc extinguishing device 17 and extinguished.
As described above, since no current flows to the movable side arc contact 6a and the fixed side arc contact 22a in the normal energized state outside opening and closing, there is no heat generation due to energization at this portion. However, heat conduction from the contact portion is possible, and there is an effect of increasing the heat radiation area.
The movable-side arc contact 6a and the arc block 22 connected to the contact surfaces of the movable contact 5 and the fixed contact 4 which are main heat generating portions are cooled by convection air as a heat radiating member in the ventilation passage between the ventilation hole 1d and the arc gas discharge window 1c. Therefore, the temperature rise of the current-carrying part is suppressed.
In addition, since the plurality of movable elements 6 including the movable-side arc contact 6a are arranged in parallel in the one-pole opening / closing portion, the movable-side arc contact 6a increases the heat radiation area as a whole. Further, the arc block 22 is provided with a concave groove 22b along the ventilation direction to increase the heat radiation area and enhance the heat radiation effect.
Since the arc block 22 constituting the fixed-side arc contact 22a is closely attached to the fixed conductor 3 on one surface and the bottom surface of the base housing 1 on the other surface, the heat of the fixed contact 4 passes through the fixed conductor 3. Then, the heat is transmitted to the arc block 22 and the heat radiation by the convection air and the heat radiation from the back surface through the bottom surface of the base housing 1 are promoted to suppress the temperature rise of the energization portion. At this time, if the bottom back surface of the base casing 1 is waved to increase the heat radiation area of the bottom back surface, the heat radiation effect can be further improved.
Industrial Applicability As described above, the air circuit breaker of the present invention includes a fixed conductor to which a fixed contact is fixed, a mover to which a movable contact that is in contact with and away from the fixed contact is fixed, and the two contacts. An arc extinguishing device that extinguishes the arc is provided in the casing, and a vent hole that is provided in a part of the casing and that opens to a portion facing the discharge window that discharges arc gas to the outside of the casing is provided. The contact and the contact energizing body are cooled by air convection from the vent hole to the discharge window inside the body, and the temperature rise due to energization heat generation is suppressed.
In addition, since the valve member that closes the vent hole when the pressure in the housing rises is provided, the valve member prevents the arc gas from being ejected from the vent hole when the accident current is interrupted.
And since the arc block provided with the fixed side arc contact extended so as to be able to conduct and heat transfer from the fixed contact, and the movable side arc contact extended from the movable contact so as to be able to conduct and heat transfer, In the closed contact state, the arc block and the movable-side arc contact which are not energized can increase the heat radiation area and can be cooled effectively.
In addition, since the opening and closing of one pole is used as a plurality of movers, and the movable side arc contacts are extended to each of the plurality of movers, all the movable side arc contacts become radiating fins, and the heat radiation area is further increased. Can be increased. Therefore, the rising temperature of the energizing part of the air circuit breaker can be suppressed within the standard upper limit temperature.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of an air circuit breaker showing the present invention.
FIG. 2 is a perspective view of the energization part of the air circuit breaker of the present invention.
FIG. 3 is a side sectional view of a conventional air circuit breaker.

Claims (4)

固定接点が固着された固定導体と、開閉機構により駆動され上記固定接点と接離する可動接点が固着された可動子と、上記可動接点及び固定接点間に発生するアークを誘引消弧する消弧装置とを筐体内に具備した気中遮断器において、上記筐体の上部であって上記消弧装置の近傍に設けられ、上記筐体内のアークガスを筐体の上方外部へ放出する放出窓と、上記筐体の下部に開口され、上記筐体の内部で上記放出窓に向う自然対流を形成する通気穴を備えたことを特徴とする気中遮断器。A fixed conductor to which a fixed contact is fixed, a mover to which a movable contact that is driven by an open / close mechanism and contacts and separates from the fixed contact, and an arc extinguishing that induces and extinguishes an arc generated between the movable contact and the fixed contact In the air circuit breaker equipped with a device in the housing, provided in the vicinity of the arc extinguishing device at the upper part of the housing , a discharge window for discharging the arc gas in the housing to the upper outside of the housing, An air circuit breaker comprising a vent hole that is opened at a lower portion of the casing and forms natural convection toward the discharge window inside the casing . 上記筐体内部の圧力上昇時には上記通気穴を閉塞する弁部材とを備えたことを特徴とする請求項１記載の気中遮断器。The air circuit breaker according to claim 1, further comprising a valve member that closes the vent hole when the pressure inside the housing increases. 上記固定接点から導電及び伝熱可能に上記消弧装置側へ延在された固定側アーク接触子を備えるアークブロックと、少なくとも上記両接点の開動作のときに上記固定側アーク接触子に接触する可動側アーク接触子を上記可動接点から導電及び伝熱可能に上記消弧装置側へ延在させて設けたことを特徴とする請求項１または２記載の気中遮断器。An arc block having a fixed-side arc contact extending to the arc-extinguishing device so as to be able to conduct and transfer heat from the fixed contact, and contacts the fixed-side arc contact at least when the both contacts are opened. The air circuit breaker according to claim 1 or 2, wherein a movable side arc contact is provided to extend from the movable contact to the arc extinguishing device so as to conduct and transfer heat. １極の開閉を複数の可動子でもっておこない、上記複数の可動子のそれぞれに可動側アーク接触子を延在させたことを特徴とする請求項３記載の気中遮断器。4. The air circuit breaker according to claim 3, wherein one pole is opened and closed by a plurality of movers, and a movable-side arc contact is extended to each of the plurality of movers.
JP2003564894A 2002-01-31 2002-01-31 Air circuit breaker Expired - Fee Related JP4138665B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2002/000739 WO2003065396A1 (en) 2002-01-31 2002-01-31 Air circuit breaker

Publications (2)

Publication Number Publication Date
JPWO2003065396A1 JPWO2003065396A1 (en) 2005-05-26
JP4138665B2 true JP4138665B2 (en) 2008-08-27

Family

ID=27639268

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003564894A Expired - Fee Related JP4138665B2 (en) 2002-01-31 2002-01-31 Air circuit breaker

Country Status (8)

Country Link
EP (1) EP1471553B1 (en)
JP (1) JP4138665B2 (en)
KR (1) KR100552413B1 (en)
CN (1) CN1253909C (en)
DE (1) DE60211562T2 (en)
ES (1) ES2262784T3 (en)
TW (1) TW540078B (en)
WO (1) WO2003065396A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005345A (en) * 2010-11-11 2011-04-06 江苏辉能电气有限公司 Arc extinguishing module of molded case low-voltage circuit breaker

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100728863B1 (en) 2006-02-16 2007-06-19 엘에스산전 주식회사 Arc extinguishing device of air circuit breaker
US7294804B1 (en) * 2007-03-29 2007-11-13 Eaton Corporation Energy dissipating spring seat
JP4753263B2 (en) * 2008-10-10 2011-08-24 三菱電機株式会社 Circuit breaker
CN101847553A (en) * 2010-06-07 2010-09-29 湖北盛佳电器设备有限公司 Breaker capable of improving disconnecting capacity
EP2573789B1 (en) 2011-09-21 2016-08-24 Siemens Aktiengesellschaft Circuit breaker with ventilation channels for efficient heat dissipation
CN105762028B (en) 2014-12-18 2019-08-02 通用电气公司 A kind of contact arm of breaker and the method for manufacturing the contact arm
WO2017183679A1 (en) * 2016-04-22 2017-10-26 三菱電機株式会社 Contactor device for circuit breaker and circuit breaker using same contactor device
KR20220061718A (en) 2020-11-06 2022-05-13 엘에스일렉트릭(주) Arc extinguish unit and air circuit breaker include the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB855730A (en) * 1957-03-27 1960-12-07 Chilton Electric Products Ltd Improvements in and relating to electrical circuit-breakers
JPS5882440A (en) * 1981-11-12 1983-05-18 三菱電機株式会社 Switching unit
JPS5882441A (en) * 1981-11-12 1983-05-18 三菱電機株式会社 Switching unit
FR2682531B1 (en) * 1991-10-15 1993-11-26 Merlin Gerin MULTIPOLAR CIRCUIT BREAKER WITH SINGLE POLE BLOCKS.
JP2882186B2 (en) * 1992-02-26 1999-04-12 三菱電機株式会社 Circuit breaker
JPH0831296A (en) * 1994-07-14 1996-02-02 Fuji Electric Co Ltd Circuit breaker
JP4438102B2 (en) * 1997-12-02 2010-03-24 日本ゼオン株式会社 Binder for battery, slurry for battery electrode, electrode for lithium secondary battery, and lithium secondary battery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102005345A (en) * 2010-11-11 2011-04-06 江苏辉能电气有限公司 Arc extinguishing module of molded case low-voltage circuit breaker
CN102005345B (en) * 2010-11-11 2012-11-21 江苏辉能电气有限公司 Arc extinguishing module of molded case low-voltage circuit breaker

Also Published As

Publication number Publication date
KR100552413B1 (en) 2006-02-16
DE60211562T2 (en) 2007-04-26
CN1253909C (en) 2006-04-26
TW540078B (en) 2003-07-01
WO2003065396A1 (en) 2003-08-07
JPWO2003065396A1 (en) 2005-05-26
DE60211562D1 (en) 2006-06-22
ES2262784T3 (en) 2006-12-01
KR20030090691A (en) 2003-11-28
EP1471553B1 (en) 2006-05-17
EP1471553A4 (en) 2005-04-06
EP1471553A1 (en) 2004-10-27
CN1494727A (en) 2004-05-05

Similar Documents

Publication Publication Date Title
JPH0821307B2 (en) Circuit breaker
US4650940A (en) Circuit breaker with arc gas vent baffle
JP4138665B2 (en) Air circuit breaker
US10460898B2 (en) Circuit breakers
JP4147347B2 (en) Circuit breaker for wiring
KR200437071Y1 (en) A mold cased circuit breaker
JP5149667B2 (en) Contact device
KR0176736B1 (en) Moving contact for circuit breaker
JP7493480B2 (en) Circuit Breakers
CN212874379U (en) Terminal clamp covering device for low-voltage circuit breaker and corresponding low-voltage circuit breaker
US11764022B2 (en) Slim circuit breaker
KR100732508B1 (en) Pressure-trip apparatus for molded case circuit breaker
JP5199712B2 (en) Contact device
JP2022174433A (en) circuit breaker
JPH09171757A (en) Circuit breaker
JPH0124328B2 (en)
JP2003272501A (en) Circuit breaker
JPH0471134A (en) Circuit breaker
JP4059007B2 (en) Switch
KR950009746Y1 (en) Circuit breaker with arc chamber vent
CN114496678A (en) Solid-state circuit breaker and power equipment
JPH0574318A (en) Switch
JPH08298064A (en) Circuit breaker
JP2009272062A (en) Contact device
KR20030075364A (en) Current limiting circuit breaker

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20071204

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080125

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080520

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080605

R151 Written notification of patent or utility model registration

Ref document number: 4138665

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R151

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110613

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120613

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130613

Year of fee payment: 5

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees