JPH02165527A - Gas insulation switching device - Google Patents
Gas insulation switching deviceInfo
- Publication number
- JPH02165527A JPH02165527A JP32013788A JP32013788A JPH02165527A JP H02165527 A JPH02165527 A JP H02165527A JP 32013788 A JP32013788 A JP 32013788A JP 32013788 A JP32013788 A JP 32013788A JP H02165527 A JPH02165527 A JP H02165527A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- shield
- circuit breaker
- gas circuit
- gas
- 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
- 238000009413 insulation Methods 0.000 title claims 2
- 230000005684 electric field Effects 0.000 claims abstract description 14
- 230000000116 mitigating effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000013016 damping Methods 0.000 abstract 4
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- 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
- H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ、産業上の利用分野
本発明は、コンタクト近傍の電界集中を緩和することに
より、半径方向及び軸心方向の縮小化を図ったガス絶縁
開閉装置に関する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a gas insulated switchgear that is downsized in the radial and axial directions by alleviating electric field concentration near contacts.
Ｂ０発明の概要
本発明は、相対的に接触・離反可能な固定コンタクト、
可動コンタクトと、これらを個別に囲繞する筒状の一対
の外部シールドと、一対の外部シールド間に設けた絶縁
筒とで一相分のガス遮断器を構成したガス絶縁開閉装置
において、絶縁筒の少なくとも一端に、緩和シールドを
埋設するとともに緩和シールドを外部シールドに接続す
ることにより、
コンタクト近傍の電界集中を緩和して、半径方向及び軸
心方向の縮小化を図ったものである。B0 Summary of the Invention The present invention provides fixed contacts that can be relatively contacted and separated;
In a gas-insulated switchgear in which a one-phase gas circuit breaker is constructed of a movable contact, a pair of cylindrical external shields that individually surround these, and an insulating tube provided between the pair of external shields, the insulating tube is By embedding a relaxation shield in at least one end and connecting the relaxation shield to an external shield, electric field concentration near the contact is alleviated and the size is reduced in the radial and axial directions.
Ｃ９従来の技術
開閉器を縦置きにしてブッシング内へ収容する縦置形開
閉装置は重心が高いために地震に弱いという欠点がある
。そのため、開閉器を横置きにしてタンク内に収容した
タンク形開閉装置が開発された。C9 Prior Art A vertical switchgear in which the switch is placed vertically and housed in a bushing has a drawback of being vulnerable to earthquakes due to its high center of gravity. Therefore, a tank-type switchgear was developed in which the switch was placed horizontally and housed in a tank.
タンク形開閉装置の構成を第３図に示す。横置にした金
属製のタンク６内に開閉器としてのガス遮断器ｌが収容
される。即ち、タンク６の両端を塞ぐ端板１０ａ、１０
ｂに一対の支持碍管５ａ。The configuration of the tank-type switchgear is shown in Figure 3. A gas circuit breaker l as a switch is housed in a horizontally placed metal tank 6. That is, the end plates 10a, 10 that close both ends of the tank 6
b is a pair of support insulator tubes 5a.
５ｂが取り付けられ、支持碍管５ａには支持金具４ａを
介してガス遮断器ｌの一端が支持される一方、支持碍管
５ｂには支持金具４ｂを介してガス遮断器ｌの他端が支
持される。端板１０ａには操作機構ＩＫが取り付けられ
、絶縁ロッドＩ２を介して可動ロッド１３が連結される
。5b is attached, and one end of the gas circuit breaker l is supported on the support insulator tube 5a via the support fitting 4a, while the other end of the gas circuit breaker l is supported on the support insulator tube 5b via the support fitting 4b. . An operating mechanism IK is attached to the end plate 10a, and a movable rod 13 is connected via an insulating rod I2.
タンク６の両端近傍には鉛直上方へ向かって立ち上がる
一対のブッシング７ａ、７ｂが設けられ、ブッシンク７
ａ、７ｂ内には導体８ａ、８ｂが設けられる。導体８ａ
、８ｂの下端は、支持金具４ａ、４ｂを介して可動ロッ
ド１３．固定ロッド１４に接続される。また、導体８ａ
、８ｂの上端は主回路端子９ａ、９ｂに接続される。な
お、３ａ。A pair of bushings 7a and 7b rising vertically upward is provided near both ends of the tank 6.
Conductors 8a and 8b are provided within a and 7b. Conductor 8a
, 8b are connected to the movable rod 13. through support fittings 4a, 4b. It is connected to the fixed rod 14. In addition, the conductor 8a
, 8b are connected to main circuit terminals 9a, 9b. In addition, 3a.
３ｂは防振ゴムである。3b is a vibration-proof rubber.
ガス遮断器の内部は、第４図に示すように構成される。The inside of the gas circuit breaker is constructed as shown in FIG.
即ち、固定ロッド１４には固定アーキングコンタクト２
５と固定アーキングコンタクト２５を囲繞する固定主コ
ンタクトＩ５とが固着される一方、可動ロッド１４には
可動アーキングコンタクト！６と可動主コンタクト１７
とが固着される。そして、バッファ室２６からの絶縁ガ
スをアークに吹きつけて消弧させるための放出路１８を
形成するため、可動アーキングコンタクト１６と可動主
コンタクト１７との間に絶縁ノズルＩ９の基端部が結合
される。そして、固定主コンタクト１５を囲繞する筒状
の外シールド２７と、可動主コンタクト１７を囲繞する
筒状の外シールド２８とが設けられ、外シールド２７．
２８間には筒状の絶縁筒２９が固着される。That is, the fixed arcing contact 2 is attached to the fixed rod 14.
5 and a fixed main contact I5 surrounding the fixed arcing contact 25 are fixed, while the movable rod 14 has a movable arcing contact! 6 and movable main contact 17
and are fixed. The base end of the insulating nozzle I9 is connected between the movable arcing contact 16 and the movable main contact 17 to form a discharge path 18 for extinguishing the arc by blowing insulating gas from the buffer chamber 26 onto the arc. be done. A cylindrical outer shield 27 surrounding the fixed main contact 15 and a cylindrical outer shield 28 surrounding the movable main contact 17 are provided.
A cylindrical insulating tube 29 is fixed between the holes 28 .
遮断時に、可動アーキングコンタクト１６が固定アーキ
ングコンタクト２５から離れる際にアークが生じるが、
図示しないピストンによってバッファ室２６から押し出
されたあと放出路１８を通って吹きつけられる絶縁ガス
によって、アークは消弧される。When the movable arcing contact 16 separates from the fixed arcing contact 25 during interruption, an arc is generated.
The arc is extinguished by the insulating gas that is pushed out of the buffer chamber 26 by a piston (not shown) and then blown through the discharge path 18.
Ｄ０発明が解決しようとする課題
ところが、開極状態では第４図に示すように固定主コン
タクト１５の先端部公人で電界が集中し、耐電圧を得る
ためには電極間距離あるいはタンク６と固定コンタクト
１５との距離を大きくする必要がある。また、電界集中
を緩和するため、コンタクトの角部の曲率を大きくして
電界分布の適正化を図って対処してきたが、これも限界
に達している。D0 Problem to be solved by the invention However, in the open state, the electric field concentrates at the tip of the fixed main contact 15 as shown in FIG. It is necessary to increase the distance from the fixed contact 15. In addition, in order to alleviate electric field concentration, efforts have been made to increase the curvature of the corners of the contacts to optimize the electric field distribution, but this approach has also reached its limit.
そして、ガス遮断器はタンク形開閉装置の最も重要な構
成機器であって他の機器に比べて多くのスペースを占め
るため、ガス遮断器の小形化は、三相−括形のタンク形
開閉装置を小形化するための重要なポイントである。Gas circuit breakers are the most important components of tank-type switchgear, and they occupy more space than other devices. This is an important point for downsizing.
そこで本発明は、斯かる課題を解決したガス絶縁開閉装
置を提供することを目的とする。Therefore, an object of the present invention is to provide a gas insulated switchgear that solves the above problem.
８１課題を解決するための手段
斯かる目的を達成するための本発明の構成は、絶縁ガス
中に並列に三相分のガス遮断器を設け、夫々のガス遮断
器を、相対的に接触・離反可能な国定コンタクト、可動
コンタクトと、固定コンタクト及び可動コンタクトを個
別に囲繞する筒状の一対の外部シールドと、一対の外部
シールド間に設けた絶縁筒とで構成したガス絶縁開閉装
置において、
絶縁筒の少なくとも一端に、円周方向に沿って電界緩和
用の緩和シールドを埋設するとともに、該緩和シールド
を外部シールドに接続したことを特徴とする。81 Means for Solving the Problems The structure of the present invention for achieving the above object is to provide gas circuit breakers for three phases in parallel in an insulating gas, and to connect the gas circuit breakers to each other in relative contact with each other. In a gas-insulated switchgear consisting of a releasable nationally specified contact, a movable contact, a pair of cylindrical external shields that individually surround the fixed contact and the movable contact, and an insulating tube provided between the pair of external shields, The present invention is characterized in that a relaxation shield for electric field relaxation is embedded in at least one end of the cylinder along the circumferential direction, and the relaxation shield is connected to an external shield.
１０作用
絶縁筒の少なくとも一端に緩和シールドを埋め込んだの
で、等電位線が緩和シールドの部分を避けて分布する。Since the relaxation shield is embedded in at least one end of the 10-effect insulating tube, the equipotential lines are distributed avoiding the relaxation shield portion.
このため、可動コンタクト、固定コンタクトの少なくと
もいずれかの先端部近傍の等電位線も先端部から少しず
つ離れ、この部分での電界集中が大幅に緩和される。Therefore, the equipotential lines near the tip of at least one of the movable contact and the fixed contact also gradually move away from the tip, and electric field concentration in this portion is significantly alleviated.
Ｇ、実施例
以下、本発明を図面に示す実施例に騙づいて詳細に説明
する。なお、本実施例は従来のガス絶縁開閉装置の一部
を改良したものなので、従来と同一部分には同一符号を
付して説明を省略し、異なる部分のみを説明する。G. Examples The present invention will be explained in detail below using examples shown in the drawings. Note that this embodiment is an improvement on a part of the conventional gas insulated switchgear, so the same parts as the conventional gas insulated switchgear are given the same reference numerals, the explanation is omitted, and only the different parts will be explained.
（ａ）第一実施例
本発明によるガス絶縁開閉装置の構成を、第１図に基づ
いて説明する。(a) First Embodiment The configuration of a gas insulated switchgear according to the present invention will be explained based on FIG.
図のように、絶縁筒２９の両端に緩和シールド２０が埋
め込まれる。この緩和シールド２０は、金属リング２０
ａを円周方向に沿って埋め込み、他の金属２０ｂを介し
て金属リング２０ａを外部シールド２７又は２８に接続
したものである。As shown in the figure, relaxation shields 20 are embedded at both ends of the insulating cylinder 29. This relaxation shield 20 includes a metal ring 20
a is embedded along the circumferential direction, and the metal ring 20a is connected to the external shield 27 or 28 via another metal 20b.
このように緩和シールド２０を設けたので、第１図に示
すように等電位線が緩和シールド２０の部分を避けて少
し移動する。Since the relaxation shield 20 is provided in this way, the equipotential line moves a little to avoid the relaxation shield 20, as shown in FIG.
それにより、固定主コンタクト１５の先端部Ａにおいて
も等電位線が先端部から離れ、等電位線の間隔が大きく
なって電界集中が緩和される。また、固定アーキングコ
ンタクト２５の先端部Ｂにおいても同様にして電界集中
が緩和される。このように電界集中が緩和され、電極間
の電位分布が均一になる。As a result, the equipotential lines at the tip A of the fixed main contact 15 also move away from the tip, the interval between the equipotential lines increases, and electric field concentration is alleviated. In addition, electric field concentration is similarly alleviated at the tip portion B of the fixed arcing contact 25. In this way, electric field concentration is relaxed and the potential distribution between the electrodes becomes uniform.
（ｂ）その他の実施例
次に、その他の実施例を第２図（ａ）〜（ｃ）に基づい
て説明する。(b) Other Embodiments Next, other embodiments will be described based on FIGS. 2(a) to 2(c).
第２図（ａ）は、本発明の第二実施例を示すものである
。図のように、絶縁筒２９の長さ方向での両端位置に、
緩和シールド２１が埋め込まれる。FIG. 2(a) shows a second embodiment of the present invention. As shown in the figure, at both ends of the insulating tube 29 in the length direction,
A mitigation shield 21 is embedded.
即ち、金属リング２１区が埋め込まれるとともに金属リ
ング２１ａが網状に形成された接続線２１ｂを介して外
部シールド２７．２８に接続される。That is, the metal ring 21 section is embedded, and the metal ring 21a is connected to the external shield 27, 28 via the connection wire 21b formed in a mesh shape.
第２図（ｂ）は、本発明の第三実施例を示すものである
。前記と同様に、絶縁筒２９の両端に緩和シールド２３
が埋め込まれる。この緩和シールド２３は、エポキシか
らなる絶縁筒２９の内部に凹部を形成して導電性ゴムを
注入し、シールド効果をもたせたものである。FIG. 2(b) shows a third embodiment of the present invention. Similar to the above, relaxation shields 23 are provided at both ends of the insulating cylinder 29.
is embedded. This relaxation shield 23 has a shielding effect by forming a recess inside an insulating cylinder 29 made of epoxy and injecting conductive rubber into the recess.
第２図（ｃ）は、本発明の第四実施例を示すものである
。第三実施例と同様にして緩和シールド２４が埋め込ま
れる。この緩和シールド２４は、チタン酸バリウムなど
の高誘電率物質を第三実施例と同様にして四部に注入し
て形成したものである。この場合は、必ずしも緩和シー
ルド２４を外部シールド２７．２８に接触させる必要は
ない。FIG. 2(c) shows a fourth embodiment of the present invention. A relaxation shield 24 is embedded in the same manner as in the third embodiment. This relaxation shield 24 is formed by injecting a high dielectric constant material such as barium titanate into four parts in the same manner as in the third embodiment. In this case, the mitigation shield 24 does not necessarily need to be in contact with the outer shield 27,28.
第２図（ｄ）は、本発明の第五実施例を示すもものであ
る。これは、第二〜第四実施例の組み合わせであり、金
属リング３０ａを導電性ゴム３０ｂで被い、耐クラツク
性を考慮した緩和シールド３０を形成している。FIG. 2(d) shows a fifth embodiment of the present invention. This is a combination of the second to fourth embodiments, and a metal ring 30a is covered with a conductive rubber 30b to form a relaxation shield 30 in consideration of crack resistance.
第２図（ｅ）に示す第六実施例と第２図ＣＩ）に示す第
七実施例は、電界集中の生じ易い固定側のみ緩和させよ
うとしたものであり、第六実施例は絶縁筒２９の固定側
にのみ緩和シールド２０を埋め込んだものである。また
、第七実施例は短い絶縁筒２９を外部シールド２７にの
み結合するとともに緩和シールド２０を埋め込んだもの
である。The sixth embodiment shown in FIG. 2(e) and the seventh embodiment shown in FIG. The relaxation shield 20 is embedded only on the fixed side of the shield 29. Further, in the seventh embodiment, a short insulating cylinder 29 is coupled only to the outer shield 27, and a relaxation shield 20 is embedded.
Ｈ０発明の効果
以上の説明かられかるように、本発明によるガス絶縁開
閉装置によれば以下の効果がある。H0 Effects of the invention As can be seen from the above explanation, the gas insulated switchgear according to the invention has the following effects.
（１）絶縁筒の少なくとも一端に緩和シールドを埋め込
んだので、可動コンタクト、固定コンタクトの少なくと
も一方の先端部近傍の電界集中が緩和される。その結果
、コンタクトの角部のＲの曲率を小さくすることが可能
となり、その分だけコンタクトの外径寸法を小さくでき
る。(1) Since the relaxation shield is embedded in at least one end of the insulating cylinder, electric field concentration near the tip of at least one of the movable contact and the fixed contact is alleviated. As a result, it is possible to reduce the curvature of the radius of the corner of the contact, and the outer diameter of the contact can be reduced accordingly.
（２）コンタクトの先端部近傍の電界集中が緩和される
ことで、開離距離を小さくすることも可能となり、ガス
遮断器の軸心方向への小形化と、更にはガス遮断器の操
作装置の小形化が図れる。(2) By easing the electric field concentration near the tip of the contact, it becomes possible to reduce the separation distance, making it possible to downsize the gas circuit breaker in the axial direction and furthermore, to make the operating device of the gas circuit breaker smaller. can be made smaller.
（３）ガス遮断器を半径方向及び軸心方向へ小さくでき
るので、三相−括形のタンク形開閉装置を一層縮小する
ことが可能となる。(3) Since the gas circuit breaker can be made smaller in both the radial and axial directions, it is possible to further downsize the three-phase, tank-type switchgear.
第１図〜第２図は本発明によるガス絶縁開閉装置の実施
例に係り、第１図は第一実施例の要部を示す拡大図、第
２図（λ）は第二実施例の要部を示す拡大図、第２図（
ｂ）は第三実施例の要部を示す拡大図、第２図（ｃ）は
第四実施例の要部を示す拡大図、第２図（ｄ）は第五実
施例の要部を示す拡大図、第２図（ｅ）は第六実施例の
要部を示す拡大図、第２図（ｆ）は第七実施例の要部を
示す拡大図、第３図はタンク形開閉装置の構成図、第４
図は従来のガス遮断器の要部を示す拡大図である。
ｌ・・・ガス遮断器、１５・・・固定主コンタクト、１
６・・・可動アーキングコンタクト、Ｉ７・・・可動主
コンタクト、１８・・・放出路、Ｉ９・・・絶縁ノズル
、２０．２１．２３．２４．３０・・・緩和シールド、
２５・・・固定アーキングコンタクト、２６・・・バッ
ファ室、２７．２８・・・外部シールド、２９・・・絶
縁筒。
外２名
第１図
ガス遮断器９要部を示す拡大図（第一実施例）トガス遮
断器
１５・−固定主コノタクト
１６ 可動アーキングコンタクト
１７−可動主コノタクト
１８ 放出路
１９ 絶線ノズル
２４．３０・・緩和ノールド
２５・固定アーキングコノタクト
２６ バッファ室
２７２８−外部ノールド
２９ 絶韓問
第３図
タンク杉開閉装置の噂成図1 and 2 relate to an embodiment of the gas insulated switchgear according to the present invention, FIG. 1 is an enlarged view showing the main parts of the first embodiment, and FIG. 2 (λ) is the main part of the second embodiment. Enlarged view showing the section, Figure 2 (
b) is an enlarged view showing the main parts of the third embodiment, Fig. 2(c) is an enlarged view showing the main parts of the fourth embodiment, and Fig. 2(d) shows the main parts of the fifth embodiment. An enlarged view, FIG. 2(e) is an enlarged view showing the main part of the sixth embodiment, FIG. 2(f) is an enlarged view showing the main part of the seventh embodiment, and FIG. 3 is an enlarged view of the tank type switchgear. Configuration diagram, 4th
The figure is an enlarged view showing the main parts of a conventional gas circuit breaker. l...Gas circuit breaker, 15...Fixed main contact, 1
6... Movable arcing contact, I7... Movable main contact, 18... Ejection path, I9... Insulating nozzle, 20.21.23.24.30... Relaxation shield,
25... Fixed arcing contact, 26... Buffer chamber, 27.28... External shield, 29... Insulating tube. Figure 1: Enlarged view showing the main parts of the gas circuit breaker 9 (first embodiment) - Gas circuit breaker 15 - Fixed main contact 16 Movable arcing contact 17 - Movable main contact 18 Discharge path 19 Disconnected nozzle 24.30・・Relaxation Nord 25・Fixed Arcing Connector 26 Buffer Room 2728-External Nord 29 Zekko Interchange Figure 3 Tank Cedar Opening and Closing Device Rumored Diagram
Claims (1)
夫々のガス遮断器を、相対的に接触・離反可能な固定コ
ンタクト、可動コンタクトと、固定コンタクト及び可動
コンタクトを個別に囲繞する筒状の一対の外部シールド
と、一対の外部シールド間に設けた絶縁筒とで構成した
ガス絶縁開閉装置において、 絶縁筒の少なくとも一端に、円周方向に沿って電界緩和
用の緩和シールドを埋設するとともに、該緩和シールド
を外部シールドに接続したことを特徴とするガス絶縁開
閉装置。(1) Install a three-phase gas circuit breaker in parallel in the insulating gas,
Each gas circuit breaker has a fixed contact and a movable contact that can be brought into and out of relative contact, a pair of cylindrical outer shields that individually surround the fixed contact and the movable contact, and insulation provided between the pair of outer shields. A gas insulated switchgear configured with a cylinder, characterized in that a relaxation shield for mitigating an electric field is buried in at least one end of the insulating cylinder along the circumferential direction, and the relaxation shield is connected to an external shield. Insulated switchgear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32013788A JPH02165527A (en) | 1988-12-19 | 1988-12-19 | Gas insulation switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32013788A JPH02165527A (en) | 1988-12-19 | 1988-12-19 | Gas insulation switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02165527A true JPH02165527A (en) | 1990-06-26 |
Family
ID=18118121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32013788A Pending JPH02165527A (en) | 1988-12-19 | 1988-12-19 | Gas insulation switching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02165527A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005339918A (en) * | 2004-05-26 | 2005-12-08 | Toshiba Corp | Switch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5261783A (en) * | 1975-11-17 | 1977-05-21 | Toshiba Corp | Insulator cylinder |
| JPS551399B2 (en) * | 1973-06-28 | 1980-01-14 | ||
| JPS573314A (en) * | 1980-06-06 | 1982-01-08 | Takamatsu Electric Works Ltd | Electrode structure for switch |
-
1988
- 1988-12-19 JP JP32013788A patent/JPH02165527A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551399B2 (en) * | 1973-06-28 | 1980-01-14 | ||
| JPS5261783A (en) * | 1975-11-17 | 1977-05-21 | Toshiba Corp | Insulator cylinder |
| JPS573314A (en) * | 1980-06-06 | 1982-01-08 | Takamatsu Electric Works Ltd | Electrode structure for switch |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005339918A (en) * | 2004-05-26 | 2005-12-08 | Toshiba Corp | Switch |
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