JPH01272024A - Vacuum valve - Google Patents
Vacuum valveInfo
- Publication number
- JPH01272024A JPH01272024A JP9831388A JP9831388A JPH01272024A JP H01272024 A JPH01272024 A JP H01272024A JP 9831388 A JP9831388 A JP 9831388A JP 9831388 A JP9831388 A JP 9831388A JP H01272024 A JPH01272024 A JP H01272024A
- Authority
- JP
- Japan
- Prior art keywords
- spacer
- electrode
- vacuum valve
- coil electrode
- main electrode
- 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.)
- Granted
Links
- 125000006850 spacer group Chemical group 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000011810 insulating material Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 8
- 240000004859 Gamochaeta purpurea Species 0.000 claims 1
- 238000000576 coating method Methods 0.000 abstract description 14
- 239000011248 coating agent Substances 0.000 abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 10
- 239000010935 stainless steel Substances 0.000 abstract description 10
- 239000000919 ceramic Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 229910052709 silver Inorganic materials 0.000 abstract description 3
- 239000004332 silver Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005476 soldering Methods 0.000 abstract 1
- 239000012212 insulator Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010040844 Skin exfoliation Diseases 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 238000003466 welding Methods 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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
-
- 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
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
- H01H33/6644—Contacts; Arc-extinguishing means, e.g. arcing rings having coil-like electrical connections between contact rod and the proper contact
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は遮断性能および機械的強度を向上させた、真空
バルブに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a vacuum valve with improved shutoff performance and mechanical strength.
（従来の技術）
従来の真空バルブの代表例として第４図に同一形状をし
た一対の電極の片側の構成を示す。(Prior Art) As a typical example of a conventional vacuum valve, FIG. 4 shows the configuration of one side of a pair of electrodes having the same shape.
１は主電極で、電流遮断時にこの表面でアークが発生す
る。２はコイル電極で、中央から放射状に延びる腕部２
ａと、円周方向に回る外周部２ｂと、主電極１との接続
部２Ｃとからなっている。通電軸３からコイル電極２に
流入した電流はコイル電極２の前記各部２ａ、２ｂ、
２ｃの順に流れ、その電流経路によりアーク柱に対して
軸方向の磁界、即ち縦磁界が発生する。＠Ｘ磁界中での
アークは、主電極１の表面に一様に分散し、アーク電圧
が低く安定しており、電極の局部的な溶融が起こりにく
いため、縦磁界電極は極めて優れた遮断性能を有してい
る。また、スペーサ４が主電極１とコイル電極２の間に
設けられてあり、電極の機械的開閉による衝撃で主電極
１やコイル電極２が変形し、接続部２Ｃ以外で接触する
のを防止している。1 is the main electrode, and an arc is generated on this surface when the current is interrupted. 2 is a coil electrode, and arm part 2 extends radially from the center.
a, an outer peripheral portion 2b rotating in the circumferential direction, and a connecting portion 2C with the main electrode 1. The current flowing into the coil electrode 2 from the current-carrying shaft 3 flows through the respective parts 2a, 2b of the coil electrode 2,
2c, and the current path generates an axial magnetic field, that is, a longitudinal magnetic field, with respect to the arc column. The arc in the @X magnetic field is uniformly distributed over the surface of the main electrode 1, the arc voltage is low and stable, and local melting of the electrode is less likely to occur, so the vertical magnetic field electrode has extremely excellent interrupting performance. have. In addition, a spacer 4 is provided between the main electrode 1 and the coil electrode 2 to prevent the main electrode 1 and the coil electrode 2 from being deformed by shocks caused by mechanical opening and closing of the electrodes and from coming into contact with each other at points other than the connecting portion 2C. ing.
このスペーサ４を通じてコイル電極２の中心部から主電
極１へ直接流れる電流を極力押えるためには電気抵抗率
が高いことが必要でおり、また機械的強度も必要とされ
ることから、その材質としては一般にステンレス鋼が使
用されている。In order to suppress the current flowing directly from the center of the coil electrode 2 to the main electrode 1 through the spacer 4, it is necessary to have high electrical resistivity, and also mechanical strength is required, so the material is Stainless steel is generally used.
しかしながら、ステンレス鋼の電気抵抗率は７２μΩｃ
ｍで銅のそれ（１，７μΩｃｍ）に比べて大きな値では
あるが、コイル電極２の通電経路は一般に敗十護以上で
おり電気抵抗が大きくなるばかりではなく、その幾何形
状により比較的大きなインダクタンスを有するので、そ
れに対応してステンレススペーサの抵抗も大ぎくする必
要がおる。However, the electrical resistivity of stainless steel is 72μΩc
Although this value is larger than that of copper (1.7 μΩcm), the current-carrying path of the coil electrode 2 is generally more than 100m, so not only does the electrical resistance become large, but its geometric shape also causes a relatively large inductance. Therefore, it is necessary to increase the resistance of the stainless steel spacer accordingly.
そのためにステンレススペーサの全長を長くしたり断面
積を小さくすると、機械的強度が損なわれるということ
になり、電気的（！！断〉性能と殿械的性能を両立させ
ることは困難なことでおった。For this reason, increasing the overall length or reducing the cross-sectional area of the stainless steel spacer will impair its mechanical strength, making it difficult to achieve both electrical (cutting) performance and mechanical performance. Ta.
そこで、このようなステンレススペーサの問題点を解決
する一方法としてセラミックス類のスペーサを用いる提
案もなされている。Therefore, as a way to solve the problems of stainless steel spacers, it has been proposed to use ceramic spacers.
しかし使用電圧が低く、従って真空遮断器の開閉スピー
ドが比較的低い場合は、このセラミックススペーサ使用
上の問題は無いが、使用電圧が高くなり開閉スピードも
高くなると、開閉動作時の衝撃応力でセラミックスは破
壊してしまうことがある。However, if the working voltage is low and therefore the opening/closing speed of the vacuum circuit breaker is relatively low, there is no problem in using this ceramic spacer. may be destroyed.
一般にセラミックス材料は原子間結合強度は高いがマク
ロな欠陥（亀裂〉が存在した場合、靭性が低いためその
先端に応力集中が生じて比較的低応力で破壊するからで
ある。This is because ceramic materials generally have high interatomic bonding strength, but if a macroscopic defect (crack) exists, stress concentration occurs at the tip due to low toughness, and the material breaks with relatively low stress.
（発明が解決しようとする課題〉
本発明は、無機質絶縁物を部分的にコーティングした金
属製スペーサを主電極とコイル電極の間に配設すること
により、スペーサを介して流れる漏れ電流を無くし十分
な縦磁界を発生させ、遮断性能の向上を図るとともに、
電極の機械的強度をも向上させた真空バルブを提供する
ことを目的とする。(Problems to be Solved by the Invention) The present invention eliminates leakage current flowing through the spacer by disposing a metal spacer partially coated with an inorganic insulator between the main electrode and the coil electrode. In addition to generating a strong vertical magnetic field and improving the blocking performance,
The object of the present invention is to provide a vacuum valve in which the mechanical strength of the electrode is also improved.
（課題を解決するための手段〉
かかる目的を達成するために、本発明ではいわゆる縦磁
界電極を使用した真空バルブにおいて、主電極とコイル
電極の中間部に、これら主電極またはコイル電極との少
なくとも一方に当接する部分に、無機質絶緑材料をコー
ティングした金属製スペーサを配置した構造としている
。(Means for Solving the Problems) In order to achieve the above object, in the present invention, in a vacuum valve using so-called vertical magnetic field electrodes, at least one of the main electrodes and the coil electrodes is provided between the main electrode and the coil electrode. It has a structure in which a metal spacer coated with an inorganic never-green material is placed on the part that comes into contact with one side.
（作 用）
このような構造にすることによって、スペーサは主電極
とコイル電極の中央部をほぼ完全に絶縁するので、スペ
ーサを介して流れる漏れ電流が無くなる。(Function) With such a structure, the spacer almost completely insulates the central part of the main electrode and the coil electrode, so there is no leakage current flowing through the spacer.
従って、全遮断電流がコイル電極を流れるので電極間に
強い縦磁界が印加され、遮断性能を向上させることがで
きる。Therefore, since the entire interrupting current flows through the coil electrodes, a strong longitudinal magnetic field is applied between the electrodes, and the interrupting performance can be improved.
ざらにスペーサの断面積は任意に大ぎくできるため、真
空バブルの開閉動作時の衝撃応力が低減できるとともに
、セラミックススペーサで懸念される欠陥部を起点とし
ての破壊が無い。Since the cross-sectional area of the spacer can be made arbitrarily large, the impact stress during the opening and closing operation of the vacuum bubble can be reduced, and there is no possibility of destruction starting from a defective part, which is a concern with ceramic spacers.
例えコーティング部に何らかの欠陥があったとしても、
局部的なりラックが生ずるだけで演み、スペーサ自体が
破壊してしまうことは無い。Even if there is some kind of defect in the coating part,
Only a localized rack will be produced, and the spacer itself will not be destroyed.
（実施例） 以下、本発明の一実施例を図面を用いて説明をする。(Example) An embodiment of the present invention will be described below with reference to the drawings.
第１図において第４図と同一部品には同一符号を記し、
その説明は省略する。In Fig. 1, parts that are the same as in Fig. 4 are given the same reference numerals.
The explanation will be omitted.
本実施例が従来例と異なるのは、スペーサ５としてステ
ンレス等の金属製円筒５ａの表面にセラミックス等の無
機質絶縁物６をコーティングした点である。This embodiment differs from the conventional example in that the surface of a metal cylinder 5a made of stainless steel or the like is coated with an inorganic insulating material 6 such as ceramics as a spacer 5.
このコーティング方法には主に化学蒸着（ＣＶＤ）法、
物理蒸着（ＰＶＤ）法、および溶射法などがあり、それ
ぞれ母材およびコーティング材料の相異により適宜使い
分けられる。This coating method mainly uses chemical vapor deposition (CVD),
There are physical vapor deposition (PVD) methods, thermal spraying methods, etc., and each method can be used appropriately depending on the differences in the base material and coating material.
なかでもプラズマ溶剣法によるアルミナセラミックスコ
ーティングは、真空バルブの製造工程の特異性を考慮す
ると最も適していると言える。Among these, alumina ceramic coating using the plasma melting method is said to be the most suitable, considering the uniqueness of the vacuum valve manufacturing process.
すなわち、真空バルブを組立てるには８００〜９００℃
という高温中で銀ろう付けをするのが一般的であるが、
この際コーディング被膜の剥離に注意する必要がある。In other words, to assemble the vacuum valve, the temperature is 800-900℃.
It is common to braze silver at high temperatures such as
At this time, care must be taken not to peel off the coating film.
その点、プラズマコーティング被膜中には気孔が包含さ
れており、ステンレス母材とアルミナセラミックス被膜
のように熱膨張率の大きく異なるものどうしでも、その
気孔部が応力を吸収緩和するので、被膜の剥離が無いと
いう特長が有る。On this point, the plasma coating film contains pores, and even if the coefficient of thermal expansion is significantly different between the stainless steel base material and the alumina ceramic film, the pores absorb and relieve stress, allowing the film to peel. It has the feature that there is no
さらに剥離の危険性を低くするために、被膜厚は数１０
〜１００μｍ稈度とすることが望ましい。Furthermore, to reduce the risk of peeling, the coating thickness is several tens of tens of
It is desirable to have a culm degree of ~100 μm.
なおアルミナのプラズマコーティングの絶縁破壊電界は
数１０ＫＶ／ ｍｍであり、遮断時にコーティング部６
にかかる電位差は数Ｖ以下であることから、この程度の
被膜厚でも絶縁性能上は十分である。The dielectric breakdown electric field of alumina plasma coating is several tens of KV/mm, and the coating part 6
Since the potential difference applied thereto is several volts or less, even a film thickness of this level is sufficient in terms of insulation performance.
以上のような構成にすることによって、スペーサ５を介
して流れる漏れ電流が無くなる。With the above configuration, leakage current flowing through the spacer 5 is eliminated.
従って、全遮断電流がコイル電極２を流れるので電極間
に強い縦磁界が印加され、遮断性能を向上させることが
できるばかりでなく、真空バルブの開閉動作時の衝撃応
力に耐える機械強度に優れた電極構造とすることができ
る。Therefore, since the entire breaking current flows through the coil electrode 2, a strong vertical magnetic field is applied between the electrodes, which not only improves the breaking performance but also has excellent mechanical strength to withstand impact stress during opening and closing operations of the vacuum valve. It can be an electrode structure.
等の金属製円筒７の径大部７ａをセラミックス等の無機
質絶縁物６でコーティングし、コイル電極２中央部の段
差部２ｄと通電軸端面３ａで挟み込むとともに、径小部
端面７ｂを主電極２の裏面に銀ろう付けしたものである
。The large-diameter portion 7a of a metal cylinder 7 is coated with an inorganic insulator 6 such as ceramics, and is sandwiched between the stepped portion 2d at the center of the coil electrode 2 and the end surface 3a of the current-carrying shaft, and the small-diameter portion end surface 7b is coated with the main electrode 2. The back side is soldered with silver.
このような構造にすることによって、主電極１とコイル
電極２はスペーサ７を介して相互に固定されるため真空
バルブの開閉動作による電極の変形もなくなる。With this structure, the main electrode 1 and the coil electrode 2 are fixed to each other via the spacer 7, so that deformation of the electrodes due to opening and closing operations of the vacuum valve is eliminated.
第３図は本発明による電極構造のざらに他の実施例で、
コイル電極が比較的薄い場合の応用例について示したも
のである。FIG. 3 shows another embodiment of the electrode structure according to the present invention.
This is an application example where the coil electrode is relatively thin.
この実施例では通電軸端面の座ぐり部３ｂに断面丁字形
のステンレス等の金属製スペーサ７の無機質絶縁物６で
コーティングされた径大部７ａ＠嵌合し、コイル電極２
の裏面を通電軸３の端面に銀ろう付けするとともに、ス
ペーサ７の径小部端面７ｂを主電極１の裏面に銀ろう付
けしたものであり、その作用効果は第２図の実施例と同
様でおる。In this embodiment, a large-diameter portion 7a coated with an inorganic insulator 6 of a spacer 7 made of metal such as stainless steel and having a T-shaped cross section is fitted into a counterbore portion 3b on the end face of the current-carrying shaft, and the coil electrode 2
The back surface of the main electrode 1 is silver-brazed to the end surface of the current-carrying shaft 3, and the end surface 7b of the small diameter portion of the spacer 7 is silver-brazed to the back surface of the main electrode 1. I'll go.
なお、本実施例においては、金属製円筒の全面にコーテ
ィングを施しているが、スペーサが主電極またはコイル
電極の少なくとも一方に当接する面にのみコーティング
を施しても同様の効果が得られる。In this example, the entire surface of the metal cylinder is coated, but the same effect can be obtained even if the coating is applied only to the surface where the spacer contacts at least one of the main electrode and the coil electrode.
（他の実施例）
真空バルブの遮断電流が比較的大きくなると、主電極相
互の溶着力が増す。(Other Embodiments) When the cutoff current of the vacuum valve becomes relatively large, the welding force between the main electrodes increases.
そのため電極開極時に主電極コとコイル電極２の間の引
張り応力も増し、電極全体が変形するようになる。Therefore, when the electrodes are opened, the tensile stress between the main electrode 2 and the coil electrode 2 also increases, causing the entire electrode to deform.
これを防止するためには、スペーサ５により主電極１と
コイル電極２とを相互に固定することが必要になる。In order to prevent this, it is necessary to fix the main electrode 1 and the coil electrode 2 to each other using the spacer 5.
コーティング６の上に更にメタライズして限ろう付けす
る方法も考えられるが、万一微細な欠陥がコーティング
６部に存在した場合、銀ろうが浸透してしまう危険性も
ある。Although it is possible to further metallize the coating 6 and perform limited brazing, there is a risk that the silver solder may penetrate if there is a minute defect in the coating 6.
そこで第２図は本発明における他の実施例について示し
たものであり、断面丁字形のステンレス以上述べたよう
に、無機質絶縁物を部分的にコーティングした金属製ス
ペーサを主電極とコイル電極の間に配設することにより
、スペーサを介して流れる漏れ電流が無くなる。そのた
め、電極間に十分な縦磁界を印加することができ遮断性
能の向上が図れるばかりでなく、電極の機械的強度をも
向上させた真空バルブを提供することができる。Therefore, Fig. 2 shows another embodiment of the present invention, in which a stainless steel spacer with a T-shaped cross section is used, as described above, a metal spacer partially coated with an inorganic insulator is placed between the main electrode and the coil electrode. By arranging the spacer, leakage current flowing through the spacer is eliminated. Therefore, it is possible to provide a vacuum valve in which not only a sufficient vertical magnetic field can be applied between the electrodes and the blocking performance can be improved, but also the mechanical strength of the electrodes can be improved.
第１図（ａ）は本発明の一実施例の縦磁界電極の平面図
、同図（ｂ）は（ａ）のＡ−Ａ断面図、第２図および第
３図は本発明の他の実施例を示す断面図、第４図（ａ）
は従来の縦磁界電極の平面図、同図（ｂ）は（ａ）のＡ
−ＡＩＦＴ面図を示す。
１・・・主電極
２・・・コイル電極
３・・・通電軸
４．５．７・・・スペーサ
６・・・無機質絶縁物
（α）
第１図
第２図
第３図FIG. 1(a) is a plan view of a vertical magnetic field electrode according to an embodiment of the present invention, FIG. 1(b) is a cross-sectional view taken along line A-A in FIG. 1(a), and FIGS. Cross-sectional view showing the embodiment, FIG. 4(a)
is a plan view of a conventional vertical magnetic field electrode, and (b) is A of (a).
- Shows an AIFT surface view. 1... Main electrode 2... Coil electrode 3... Current-carrying shaft 4.5.7... Spacer 6... Inorganic insulator (α) Figure 1 Figure 2 Figure 3
Claims (1)
る主電極とこの主電極の背面に軸方向の磁界を発生させ
るちたに取付けられたコイル電極とを有する真空バルブ
において、前記主電極と前記コイル電極とを重ね合わせ
たときの中間部に、前記主電極またはコイル電極の少く
なくとも一方に当接する部分に、無機質絶緑材料をコー
ティングした金属製スペーサを配置したことを特徴とす
る真空バルブ。 ２）金属製スペーサの少なくとも一方の端部に径大部を
設け、無機質絶縁材料にてコーティングしたこの径大部
をコイル電極中央部と通電軸間で挟むとともに、前記ス
ペーサの他端を主電極の背面にろう付けしたことを特徴
とする特許請求の範囲第１項記載の真空バルブ。[Scope of Claims] 1) A main electrode which is disposed in a vacuum container so as to be able to come and go and which ignites an arc, and a coil electrode which is attached to the back of this main electrode and which generates an axial magnetic field. In the vacuum valve, a metal spacer coated with an inorganic everlasting green material is provided at an intermediate portion when the main electrode and the coil electrode are overlapped, and a portion that abuts at least one of the main electrode or the coil electrode is coated with an inorganic evergreen material. A vacuum valve characterized by the arrangement of. 2) At least one end of the metal spacer is provided with a large diameter part, and this large diameter part coated with an inorganic insulating material is sandwiched between the center part of the coil electrode and the current-carrying shaft, and the other end of the spacer is connected to the main electrode. 2. The vacuum valve according to claim 1, wherein the vacuum valve is brazed to the back surface of the vacuum valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098313A JP2653466B2 (en) | 1988-04-22 | 1988-04-22 | Vacuum valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63098313A JP2653466B2 (en) | 1988-04-22 | 1988-04-22 | Vacuum valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01272024A true JPH01272024A (en) | 1989-10-31 |
| JP2653466B2 JP2653466B2 (en) | 1997-09-17 |
Family
ID=14216434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63098313A Expired - Lifetime JP2653466B2 (en) | 1988-04-22 | 1988-04-22 | Vacuum valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2653466B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57208023A (en) * | 1981-06-17 | 1982-12-21 | Tokyo Shibaura Electric Co | Vacuum bubl |
| JPS6046629U (en) * | 1983-09-07 | 1985-04-02 | 株式会社明電舎 | vacuum interrupter |
-
1988
- 1988-04-22 JP JP63098313A patent/JP2653466B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57208023A (en) * | 1981-06-17 | 1982-12-21 | Tokyo Shibaura Electric Co | Vacuum bubl |
| JPS6046629U (en) * | 1983-09-07 | 1985-04-02 | 株式会社明電舎 | vacuum interrupter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2653466B2 (en) | 1997-09-17 |
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