JPH05135681A - Device for extinguishing arc - Google Patents
Device for extinguishing arcInfo
- Publication number
- JPH05135681A JPH05135681A JP3294485A JP29448591A JPH05135681A JP H05135681 A JPH05135681 A JP H05135681A JP 3294485 A JP3294485 A JP 3294485A JP 29448591 A JP29448591 A JP 29448591A JP H05135681 A JPH05135681 A JP H05135681A
- Authority
- JP
- Japan
- Prior art keywords
- arc
- fixed contact
- contact
- insulator
- movable contact
- 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.)
- Pending
Links
- 239000012212 insulator Substances 0.000 claims abstract description 18
- 238000013459 approach Methods 0.000 claims abstract description 4
- 238000007872 degassing Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 3
- 230000008033 biological extinction Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000000696 magnetic material Substances 0.000 description 6
- 239000007769 metal material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000197 pyrolysis Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、回路遮断器等に適用
される消弧装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc extinguishing device applied to a circuit breaker or the like.
【０００２】[0002]
【従来の技術】従来例を図６および図７に示す。すなわ
ち、この回路遮断器の消弧装置は、固定接点７０を有す
る固定接触子７１と、この固定接触子７１に対向して接
離する可動接点７２を有する可動接触子７３と、可動接
点７２と固定接点７０の間のアークを電源側端子８０側
の排気孔７９の方向に駆動する磁束を発生する一対の駆
動コイル７４と、一対の駆動コイル７４にまたがる側板
７５とこの側板７５を連結する背板７６とで形成された
Ｕ字形の磁性体７７と、この磁性体７７の内面に被覆さ
れてアークの熱により熱分解ガスを発生する絶縁体７８
とを備えている。2. Description of the Related Art A conventional example is shown in FIGS. That is, the arc extinguishing device of this circuit breaker includes a fixed contact 71 having a fixed contact 70, a movable contact 73 having a movable contact 72 facing and coming away from the fixed contact 71, and a movable contact 72. A pair of drive coils 74 that generate a magnetic flux that drives the arc between the fixed contacts 70 toward the exhaust hole 79 on the power supply side terminal 80 side, a side plate 75 that extends over the pair of drive coils 74, and a back plate that connects the side plates 75. A U-shaped magnetic body 77 formed of the plate 76 and an insulator 78 that is coated on the inner surface of the magnetic body 77 and generates a pyrolysis gas by the heat of the arc.
It has and.
【０００３】この消弧装置によれば、過大電流の発生時
に電磁反発力によって開離する可動接触子７３の可動接
点７２と固定接点７０との間に発生したアークは、駆動
コイル７４および磁性体７７によって磁気駆動され、こ
れによりアークが伸長してアーク電圧が上昇する。ま
た、アークの熱により絶縁体７８より発生した熱分解ガ
スでアークを冷却する相乗効果によってアークを消弧す
る。According to this arc-extinguishing device, the arc generated between the movable contact 72 and the fixed contact 70 of the movable contactor 73, which is opened by the electromagnetic repulsive force when the excessive current is generated, causes the arc to be generated in the drive coil 74 and the magnetic material. It is magnetically driven by 77, which extends the arc and raises the arc voltage. Further, the arc is extinguished by the synergistic effect of cooling the arc with the pyrolysis gas generated from the insulator 78 by the heat of the arc.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、この消
弧装置は、遮断時に固定接点７０と可動接点７２との間
に発生したアークの付近は両側を絶縁体７８によって囲
まれているため、高圧力状態になっている。特に、固定
接点７０の直上部では固定接点７０からの金属材料の蒸
発が盛んであるため最も圧力が高くなっている。気体の
性質上、圧力の上昇に伴ってアーク温度も上昇すること
から、アークの固定側の足付近での金属材料の蒸発がさ
らに促進されることになる。そのため、アークの足が固
定接点７０上に停滞しやすい状態になり、電源端子８０
側の排気孔７９の方向へ駆動されるまでの時間が長くな
って消弧性能の劣化を招くという問題があった。However, in this arc extinguishing device, since the arcs generated between the fixed contact 70 and the movable contact 72 at the time of interruption are surrounded by the insulators 78 on both sides, a high pressure is applied. It is in a state. Particularly, immediately above the fixed contact 70, the pressure is highest because the evaporation of the metal material from the fixed contact 70 is active. Due to the nature of the gas, the arc temperature rises as the pressure rises, which further promotes the evaporation of the metallic material near the foot on the fixed side of the arc. Therefore, the legs of the arc are likely to stay on the fixed contact 70, and the power terminal 80
However, there is a problem in that it takes a long time to drive in the direction of the exhaust hole 79 on the side and the arc extinguishing performance is deteriorated.
【０００５】したがって、この発明の目的は、アークが
走行しやすくし消弧性能を向上することができる消弧装
置を提供することである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an arc extinguishing device capable of facilitating arc traveling and improving arc extinguishing performance.
【０００６】[0006]
【課題を解決するための手段】この発明の消弧装置は、
固定接点を有する固定接触子と、前記固定接点に接離す
る可動接点を有する可動接触子と、内面が絶縁体で被覆
されたＵ字形であってその一対の側板が前記固定接点の
両側に接近し前記可動接点が内部に位置するように配置
された磁性体とを備え、前記磁性体および前記絶縁体の
前記固定接点の側部にガス抜き開口を形成したものであ
る。The arc-extinguishing device of the present invention comprises:
A fixed contactor having a fixed contact, a movable contactor having a movable contact that comes in contact with and separated from the fixed contact, and a U-shaped inner surface covered with an insulator, the pair of side plates approaching both sides of the fixed contact. And a magnetic body arranged so that the movable contact is located inside, and a gas vent opening is formed in a side portion of the fixed contact of the magnetic body and the insulator.
【０００７】[0007]
【作用】この発明の構成によれば、固定接点と可動接点
との間にアークが発生するとき固定接点の金属材料の蒸
発により固定接点の近傍の圧力が高まるが、その高圧ガ
スの一部は磁性体および絶縁体に形成したガス抜き開口
より磁性体の外部に流出するため、接点近傍の圧力が下
がりアーク温度が下がることによって金属材料の蒸発が
抑えられ、このためアークの駆動が容易になり走行しや
すくなるので、アーク電圧が上昇しやすくなって回路遮
断器の消弧性能を向上させることができる。According to the structure of the present invention, when an arc is generated between the fixed contact and the movable contact, the pressure in the vicinity of the fixed contact increases due to evaporation of the metal material of the fixed contact, but a part of the high pressure gas is Since the gas flows out of the magnetic material through the gas vent openings formed in the magnetic material and the insulator, the pressure in the vicinity of the contact decreases and the arc temperature decreases, which suppresses evaporation of the metal material, which facilitates driving of the arc. Since the vehicle easily travels, the arc voltage easily rises and the arc extinguishing performance of the circuit breaker can be improved.
【０００８】[0008]
【実施例】この発明の一実施例を図１ないし図３により
説明する。すなわち、この回路遮断器の消弧装置は、磁
性体２と、固定接触子１７と、可動接触子１８とを有し
ている。固定接触子１７は、一端部に固定接点９を設
け、他端部に電源側端子１４を一体に設けている。また
固定接点１０の両側に駆動コイル部２１を形成し、駆動
コイル部２１の一端と固定接点９とが連続し駆動コイル
部２１の他端と電源側端子１４とが連続するようにして
いる。すわなち、この駆動コイル部２１は矩形板に略Ｕ
字形の切筋を形成し、その切筋と矩形板の側縁側をＣ字
形に折曲して駆動コイル部２１を形成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. That is, the arc extinguishing device of this circuit breaker has the magnetic body 2, the fixed contact 17, and the movable contact 18. The fixed contact 17 has a fixed contact 9 at one end and a power source side terminal 14 at the other end. Further, drive coils 21 are formed on both sides of the fixed contact 10 so that one end of the drive coil 21 and the fixed contact 9 are continuous, and the other end of the drive coil 21 and the power supply side terminal 14 are continuous. That is, the drive coil portion 21 is formed in a rectangular plate and is substantially U-shaped.
A cut line having a V-shape is formed, and the drive coil portion 21 is formed by bending the cut line and the side edge of the rectangular plate into a C shape.
【０００９】可動接触子１８は、固定接点９に接離する
可動接点９を先端部に有し、基端部は回路遮断器の開閉
機構部の回動軸（図示せず）に連結されている。磁性体
２は、内面が絶縁体２２で被覆されたＵ字形であってそ
の一対の側板８が固定接点９の両側に接近し可動接点１
０が内部に位置するように配置されている。実施例では
磁性体１が一対の側板８と背板１からなり、一対の側板
８の端部に駆動コイル部２１を避けるガス抜き開口５を
兼ねた切欠部３を形成している。またＵ字形の絶縁体２
２が駆動コイル部２１の内側で固定接点９に被さるよう
に配置され、これに磁性体２が被さるように嵌合してい
る。この絶縁体２２はアークの熱により熱分解ガスを発
生するとともに磁性体２のアーク橋絡を防止するもので
あり、絶縁体２２の周縁部には磁性体２の周縁部を被覆
するためのフランジ２４、駆動コイル部２１と磁性体２
とを絶縁する仕切り部２５および固定接触子１７の駆動
コイル部２１と固定接点９との連続部４に被さる絶縁部
２６とを有する。さらに絶縁体２２の両側部に磁性体２
の切欠部３に位置する部分に切欠を実施例とするガス抜
き開口６を形成している。The movable contactor 18 has a movable contact 9 at its tip end that contacts and separates from the fixed contact 9, and its base end is connected to a rotary shaft (not shown) of the opening / closing mechanism of the circuit breaker. There is. The magnetic body 2 has a U-shape whose inner surface is covered with an insulator 22, and a pair of side plates 8 approach both sides of the fixed contact 9 to move the movable contact 1.
It is arranged so that 0 is located inside. In the embodiment, the magnetic body 1 is composed of a pair of side plates 8 and a back plate 1, and a notch 3 which also serves as a gas vent opening 5 for avoiding the drive coil portion 21 is formed at an end of the pair of side plates 8. Also U-shaped insulator 2
2 is arranged inside the drive coil portion 21 so as to cover the fixed contact 9, and is fitted so as to cover the magnetic body 2. This insulator 22 generates a pyrolysis gas by the heat of the arc and prevents the arc bridging of the magnetic body 2. The peripheral edge of the insulator 22 is a flange for covering the peripheral edge of the magnetic body 2. 24, drive coil portion 21 and magnetic body 2
It has a partition part 25 for insulating between and, and an insulating part 26 covering the continuous part 4 of the drive coil part 21 of the fixed contact 17 and the fixed contact 9. Further, the magnetic substance 2 is provided on both sides of the insulator 22.
A gas vent opening 6 having a cutout as an example is formed in a portion located in the cutout 3.
【００１０】この実施例は、固定接点９と可動接点１０
のオン状態でこれらに短絡電流等が流れると、電磁反発
力によって可動接触子１８が回動すると同時に異常電流
検出手段が動作し、開閉機構部がトリップ動作して可動
接触子１８が開極動作し、固定接点９が開極する。固定
接点９と可動接点１０との間に図２のようにアークＡが
発生すると、駆動コイル部２１に発生する磁束にアーク
が鎖交するため駆動力が発生し磁気駆動される。また可
動接触子１８および固定接触子１７に流れる電流ならび
にアークＡのまわりに発生する磁束が磁性体２を通り側
板８間を流れることによって、アークＡに鎖交してアー
クＡを背板１側に引き寄せる。これらのアーク駆動力に
よってアークＡが伸長しアーク電圧が上昇する。またア
ークＡの熱により絶縁体２２より発生した熱分解ガスで
アークＡを冷却する相乗効果によってアークＡを消弧す
る。In this embodiment, a fixed contact 9 and a movable contact 10 are provided.
When a short-circuit current or the like flows in these in the ON state of, the movable contact 18 is rotated by the electromagnetic repulsion force, and at the same time, the abnormal current detection means operates, the opening / closing mechanism section trips, and the movable contact 18 opens. Then, the fixed contact 9 opens. When an arc A is generated between the fixed contact 9 and the movable contact 10 as shown in FIG. 2, the magnetic flux generated in the drive coil portion 21 is linked with the arc, so that a driving force is generated and magnetically driven. Further, the current flowing through the movable contact 18 and the fixed contact 17 and the magnetic flux generated around the arc A pass through the magnetic body 2 and between the side plates 8 so that the arc A is linked to the arc A on the back plate 1 side. Attract to. Due to these arc driving forces, the arc A extends and the arc voltage rises. Further, the arc A is extinguished by the synergistic effect of cooling the arc A with the pyrolysis gas generated from the insulator 22 by the heat of the arc A.
【００１１】この場合、固定接点９と可動接点１０のア
ークＡの付近のガスが図３の矢印のようにガス抜き開口
５，６より抜けてガス圧が下がり、温度は圧力に関係す
るのでアーク温度が下がり、これにより金属蒸気の発生
が抑えられるため、アークＡの足が駆動されやすくアー
クＡが走行しやすくなり、アークＡが伸びてアーク電圧
が高まる。In this case, the gas in the vicinity of the arc A of the fixed contact 9 and the movable contact 10 passes through the gas vent openings 5 and 6 as shown by the arrow in FIG. 3 to lower the gas pressure, and the temperature is related to the pressure. Since the temperature decreases and the generation of metal vapor is suppressed, the foot of the arc A is easily driven, the arc A easily travels, the arc A extends, and the arc voltage increases.
【００１２】ここで、ガス抜き開口５，６のあるこの実
施例とガス抜き開口のない従来例との消弧性能を大電流
遮断試験により調べた。試験条件は２６５Ｖ，５ｋＡで
ある。その結果、この実施例について図４の電流Ｑ1 お
よびアーク電圧Ｑ2 を示し、ガス抜き開口のない従来例
について図５の電流Ｑ3 およびアーク電圧Ｑ4 を示し
た。すなわち、図４の実施例ではアーク電圧Ｑ2 の最大
値１７０Ｖ，平均値１３９Ｖであるのに対して、図５の
従来例でのアーク電圧Ｑ4 の最大値は１４８Ｖ、平均値
１２０Ｖであり、この実施例の方がアーク電圧Ｑ2 が高
くなっており、消弧性能が向上していることが確認され
た。Here, the arc extinguishing performance of this embodiment having the gas vent openings 5 and 6 and the conventional example having no gas vent openings was examined by a large current interruption test. The test conditions are 265 V and 5 kA. As a result, the current Q 1 and the arc voltage Q 2 in FIG. 4 are shown for this embodiment, and the current Q 3 and the arc voltage Q 4 in FIG. 5 are shown for the conventional example having no vent opening. That is, the maximum value of the arc voltage Q 2 is 170 V and the average value is 139 V in the embodiment of FIG. 4, whereas the maximum value of the arc voltage Q 4 is 148 V and the average value is 120 V in the conventional example of FIG. It was confirmed that the arc voltage Q 2 was higher in this example and the arc extinguishing performance was improved.
【００１３】なお、固定接触子１７および可動接触子１
８の構成は前記実施例に限定されず、駆動コイル部２１
のないものを含む。また磁性体２は、切欠部３のほか両
側板の縁部が寸法的に固定接点９の両側まで達していな
いものを含む。The fixed contact 17 and the movable contact 1
The configuration of No. 8 is not limited to the above-described embodiment, and the drive coil unit 21
Including those without. Further, the magnetic body 2 includes not only the notch 3 but also the edges of both side plates that do not reach the both sides of the fixed contact 9 dimensionally.
【００１４】[0014]
【発明の効果】この発明の消弧装置は、固定接点と可動
接点との間にアークが発生したとき固定接点の金属材料
の蒸発により固定接点の近傍の圧力が高まるが、その高
圧ガスの一部は磁性体および絶縁体に形成したガス抜き
開口より磁性体の外部に流出するため、接点近傍の圧力
が下がりアーク温度が下がることによって金属材料の蒸
発が抑えられ、アークの駆動が容易になりアークが走行
しやすくなるのでアーク電圧が上昇しやすくなり回路遮
断器の消弧性能を向上させることができるという効果が
ある。According to the arc-extinguishing device of the present invention, when an arc is generated between the fixed contact and the movable contact, the pressure in the vicinity of the fixed contact increases due to evaporation of the metal material of the fixed contact. Since the part flows out of the magnetic material through the gas vent opening formed in the magnetic material and the insulator, the pressure in the vicinity of the contact decreases and the arc temperature decreases, which suppresses the evaporation of the metal material and facilitates the driving of the arc. Since the arc easily travels, the arc voltage easily rises, and the arc extinguishing performance of the circuit breaker can be improved.
【図１】この発明の第１の実施例の分解斜視図である。FIG. 1 is an exploded perspective view of a first embodiment of the present invention.
【図２】実施例の側面図である。FIG. 2 is a side view of the embodiment.
【図３】その部分断面図である。FIG. 3 is a partial cross-sectional view thereof.
【図４】遮断時の電流およびアーク電圧の波形図であ
る。FIG. 4 is a waveform diagram of current and arc voltage at the time of interruption.
【図５】従来例の遮断時の電流およびアーク電圧の波形
図である。FIG. 5 is a waveform diagram of a current and an arc voltage at the time of interruption in a conventional example.
【図６】従来例の分解斜視図である。FIG. 6 is an exploded perspective view of a conventional example.
【図７】従来例の側面図である。FIG. 7 is a side view of a conventional example.
２ 磁性体 ５，６ ガス抜き開口 ９ 固定接点 １０ 可動接点 １７ 固定接触子 １８ 可動接触子 ２２ 絶縁体 2 Magnetic material 5, 6 Gas venting opening 9 Fixed contact 10 Moving contact 17 Fixed contact 18 Moving contact 22 Insulator
Claims (1)
定接点に接離する可動接点を有する可動接触子と、内面
が絶縁体で被覆されたＵ字形であってその一対の側板が
前記固定接点の両側に接近し前記可動接点が内部に位置
するように配置された磁性体とを備え、前記磁性体およ
び前記絶縁体の前記固定接点の側部にガス抜き開口を形
成した消弧装置。1. A fixed contact having a fixed contact, a movable contact having a movable contact coming into contact with and separated from the fixed contact, a U-shaped inner surface of which is covered with an insulator, and a pair of side plates of the fixed contact. An arc extinguishing device comprising: a magnetic body arranged so as to approach both sides of a contact so that the movable contact is located inside, and a degassing opening is formed on a side portion of the fixed contact of the magnetic body and the insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3294485A JPH05135681A (en) | 1991-11-11 | 1991-11-11 | Device for extinguishing arc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3294485A JPH05135681A (en) | 1991-11-11 | 1991-11-11 | Device for extinguishing arc |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05135681A true JPH05135681A (en) | 1993-06-01 |
Family
ID=17808378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3294485A Pending JPH05135681A (en) | 1991-11-11 | 1991-11-11 | Device for extinguishing arc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05135681A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002270080A (en) * | 2001-03-12 | 2002-09-20 | Mitsubishi Electric Corp | Current limiting mechanism and circuit breaker having the same |
| JP2011146335A (en) * | 2010-01-18 | 2011-07-28 | Mitsubishi Electric Corp | Circuit breaker |
-
1991
- 1991-11-11 JP JP3294485A patent/JPH05135681A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002270080A (en) * | 2001-03-12 | 2002-09-20 | Mitsubishi Electric Corp | Current limiting mechanism and circuit breaker having the same |
| JP2011146335A (en) * | 2010-01-18 | 2011-07-28 | Mitsubishi Electric Corp | Circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |