JP2010092668A - Vacuum valve - Google Patents

Vacuum valve Download PDF

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JP2010092668A
JP2010092668A JP2008260044A JP2008260044A JP2010092668A JP 2010092668 A JP2010092668 A JP 2010092668A JP 2008260044 A JP2008260044 A JP 2008260044A JP 2008260044 A JP2008260044 A JP 2008260044A JP 2010092668 A JP2010092668 A JP 2010092668A
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vacuum valve
contact
current
blocking member
current blocking
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JP5210789B2 (en
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Yoshimitsu Niwa
芳充 丹羽
Kosuke Sasage
浩資 捧
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Toshiba Corp
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Toshiba Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To shorten a current passage expanding in a radius direction inside a slitted electrode and aiming at making uniform a vertical magnetic field distribution. <P>SOLUTION: In a vacuum valve having a pair of contacts in a free attachment and separation, the contact is provided with a slitted electrode 2 of a cup shape with its bottom part 2a fixed with an end of an electricity passing shaft 1, a contactor 4 fixed with an open end of a peripheral part 2b of the slitted electrode 2, a reinforcing member 5 arranged between the contactor 4 and the bottom part 2a, a current preventing member 6 penetrating the bottom part 2a and arranged between the reinforcing member 5 and the electricity passing shaft 1, and the current preventing member 6 is arranged inside in an axial direction of the electricity passing shaft 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、強い縦磁界を発生させ、遮断特性を向上し得る接離自在の一対の接点を有する真空バルブに関する。   The present invention relates to a vacuum valve having a pair of contactable and separable contacts that can generate a strong longitudinal magnetic field and improve a cutoff characteristic.

従来、接点の軸方向と平行な磁界、所謂縦磁界を発生させ、遮断特性を向上し得る接点を用いた真空バルブが知られている（例えば、特許文献１参照。）。   2. Description of the Related Art Conventionally, a vacuum valve using a contact that can generate a magnetic field parallel to the axial direction of the contact, that is, a so-called longitudinal magnetic field, and improve the interruption characteristics is known (see, for example, Patent Document 1).

この種の一対の接点のうちの一方を図７に示す。通電軸１端には、電気銅からなるカップ状のスリット付き電極２が固着されている。スリット付き電極２は、通電軸１端に固着される円板状の底部２ａと筒状の外周部２ｂとで構成されている。外周部２ｂ側面には、軸方向を斜めに横切る複数本（４本）のスリット３が設けられている。外周部２ｂの開放端には、銅合金からなる円板状の接離自在の接触子４が固着されている。接触子４と底部２ａ間の空間部には、両端に鍔部を設けた円柱状のステンレスなどからなる補強部材５が設けられている。
特開２００８−１３５３３８号公報 （第３ページ、図１） One of a pair of contacts of this type is shown in FIG. A cup-shaped slit electrode 2 made of electrolytic copper is fixed to the end of the energizing shaft 1. The electrode 2 with a slit is comprised by the disk-shaped bottom part 2a fixed to the electricity supply shaft 1 end, and the cylindrical outer peripheral part 2b. A plurality of (four) slits 3 that obliquely cross the axial direction are provided on the side surface of the outer peripheral portion 2b. A disc-shaped contactable contact 4 made of a copper alloy is fixed to the open end of the outer peripheral portion 2b. In the space between the contact 4 and the bottom 2a, a reinforcing member 5 made of columnar stainless steel or the like having flanges at both ends is provided.
JP 2008-135338 A (3rd page, FIG. 1)

上記の従来の真空バルブにおいては、次のような問題がある。電流ｉは、矢印で示すように、通電軸１からスリット付き電極２の底部２ａへ流れ、底部２ａから外周部２ｂへと流れる。即ち、図８に示すように、底部２ａでは半径方向へ広がる向きとなり、外周部２ｂではスリット３に沿って円周方向の向きとなって、接触子４に流れ込む。この円周方向の向きによって、縦磁界が発生し、真空中のアークが制御され、遮断特性を向上させることができる。   The above-described conventional vacuum valve has the following problems. As indicated by the arrow, the current i flows from the energizing shaft 1 to the bottom 2a of the slit electrode 2 and from the bottom 2a to the outer periphery 2b. That is, as shown in FIG. 8, the bottom portion 2 a flows in the radial direction and the outer peripheral portion 2 b flows in the circumferential direction along the slit 3 and flows into the contact 4. A longitudinal magnetic field is generated by this circumferential direction, the arc in the vacuum is controlled, and the interruption characteristic can be improved.

しかしながら、半径方向に広がる電流成分によっても磁界が発生し、円周方向で発生させる磁界に重畳する。半径方向に広がる電流ｉは、約９０度毎に分割された４個所で最長で通電軸１の中心部から外周部２ｂまでの長い経路をとり、大きな磁界を発生させる。このため、アークを制御する縦磁界の分布が接点４全域で不均一となり、遮断特性の向上をし難くさせる。   However, a magnetic field is also generated by a current component spreading in the radial direction, and is superimposed on the magnetic field generated in the circumferential direction. The current i spreading in the radial direction takes a long path from the center of the current-carrying shaft 1 to the outer periphery 2b at the longest at four points divided every 90 degrees, and generates a large magnetic field. For this reason, the distribution of the longitudinal magnetic field that controls the arc becomes non-uniform throughout the contact point 4 and makes it difficult to improve the breaking characteristics.

本発明は上記問題を解決するためになされたもので、スリット付き電極の底部内で半径方向に広がる電流経路を短くし、縦磁界分布の均一化を図り、遮断特性を向上し得る真空バルブを提供することを目的とする。   The present invention has been made to solve the above problems, and a vacuum valve that shortens the current path that extends in the radial direction within the bottom of the slit electrode, makes the distribution of the longitudinal magnetic field uniform, and improves the cutoff characteristics. The purpose is to provide.

上記目的を達成するために、本発明の真空バルブは、接離自在の一対の接点を有する真空バルブにおいて、前記接点は、底部が通電軸端に固着されたカップ状のスリット付き電極と、前記スリット付き電極の開放端に固着された接触子と、前記接触子と前記底部間に設けられた補強部材と、前記底部を貫通するとともに、前記補強部材と前記通電軸間に設けられた電流阻止部材とを有し、前記電流阻止部材を前記通電軸の軸方向の内部まで設けたことを特徴とする。   In order to achieve the above object, the vacuum valve of the present invention is a vacuum valve having a pair of contactable and separable contacts, wherein the contact includes a cup-shaped slit electrode having a bottom portion fixed to a current-carrying shaft end; A contact fixed to the open end of the slit electrode, a reinforcing member provided between the contact and the bottom, and a current blocking provided between the reinforcing member and the energizing shaft while penetrating the bottom. And the current blocking member is provided in the axial direction of the energizing shaft.

本発明によれば、通電軸端に電流阻止部材を設けてスリット付き電極を固着しているので、スリット付き電極の底部で半径方向に広がる電流経路が短くなり、外周部で発生させる縦磁界の分布を改善することができ、遮断特性を向上させることができる。   According to the present invention, the current blocking member is provided at the end of the current-carrying shaft, and the slit electrode is fixed. Therefore, the current path extending in the radial direction at the bottom of the slit electrode is shortened, and the longitudinal magnetic field generated at the outer periphery is reduced. The distribution can be improved and the blocking characteristic can be improved.

以下、図面を参照して本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

先ず、本発明の実施例１に係る真空バルブを図１、図２を参照して説明する。図１は、本発明の実施例１に係る真空バルブに用いられる一方の接点を示す半断面図、図２は、本発明の実施例１に係る真空バルブに用いられる一方の接点を示す上面図である。なお、各図において、従来と同様の構成部分については、同一符号を付した。   First, a vacuum valve according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a half sectional view showing one contact used in a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 is a top view showing one contact used in the vacuum valve according to Embodiment 1 of the present invention. It is. In addition, in each figure, the same code | symbol was attached | subjected about the component similar to the past.

図１に示すように、通電軸１端には、電気銅などからなるカップ状のスリット付き電極２が固着されている。スリット付き電極２は、通電軸１端に固着される円板状の底部２ａとこの外周に連接された筒状の外周部２ｂとで構成されている。外周部２ｂの側面には、軸方向を斜めに横切る複数本（４本）のスリット３が設けられている。外周部２ｂの開放端には、銅合金からなる円板状の接離自在の接触子４が固着されている。接触子４と底部２ａ間の空間部には、両端に鍔部を設けた円柱状のステンレスなどからなる補強部材５が設けられている。   As shown in FIG. 1, a cup-shaped slit electrode 2 made of electrolytic copper or the like is fixed to the end of the current-carrying shaft 1. The electrode 2 with a slit is comprised by the disk-shaped bottom part 2a fixed to the electricity supply shaft 1 end, and the cylindrical outer peripheral part 2b connected with this outer periphery. A plurality of (four) slits 3 that obliquely cross the axial direction are provided on the side surface of the outer peripheral portion 2b. A disc-shaped contactable contact 4 made of a copper alloy is fixed to the open end of the outer peripheral portion 2b. In the space between the contact 4 and the bottom 2a, a reinforcing member 5 made of columnar stainless steel or the like having flanges at both ends is provided.

また、底部２ａの中央部には開口孔２ａ１が設けられ、更に通電軸１端の中央部には凹部１ａが設けられている。そして、これらの空間部には、セラミックスなどの絶縁材料や、鉄合金、銅合金など、電気銅よりも抵抗の高い金属材料からなる円柱状の電流阻止部材６が設けられている。即ち、電流阻止部材６は、底部２ａを貫通し、通電軸１の軸方向の内部（凹部１ａに相当）にまで設けられている。電流阻止部材６と補強部材５とは当接している。   An opening hole 2a1 is provided at the center of the bottom 2a, and a recess 1a is provided at the center of the end of the energizing shaft 1. In these space portions, a cylindrical current blocking member 6 made of an insulating material such as ceramics, or a metal material having a higher resistance than electric copper, such as an iron alloy or a copper alloy, is provided. That is, the current blocking member 6 passes through the bottom portion 2a and is provided in the axial direction of the energizing shaft 1 (corresponding to the recess 1a). The current blocking member 6 and the reinforcing member 5 are in contact with each other.

これにより、図１、図２の矢印で示すように、電流ｉは、通電軸１内で電流阻止部材６により外周方向に広げられ、スリット付き電極２の底部２ａへ流れ、そして外周部２ｂへと流れる経路となる。底部２ｂでは、半径方向に広がる電流経路が電流阻止部材６外周から外周部２ｂまでとなり、短いものとなる。このため、半径方向に広がる電流成分によって発生する磁界を極めて小さいものにすることができる。   Thereby, as shown by the arrows in FIGS. 1 and 2, the current i is spread in the outer circumferential direction by the current blocking member 6 in the energizing shaft 1, flows to the bottom 2a of the slit electrode 2, and then to the outer circumferential portion 2b. And a flowing path. In the bottom portion 2b, the current path extending in the radial direction extends from the outer periphery of the current blocking member 6 to the outer peripheral portion 2b, and is short. For this reason, the magnetic field generated by the current component spreading in the radial direction can be made extremely small.

ここで、スリット付き電極２、接触子４、補強部材５、電流阻止部材６で接離自在の接点の一方が構成される。他方の接点も同様である。   Here, the electrode 2 with the slit, the contact 4, the reinforcing member 5, and the current blocking member 6 constitute one of the contact points that can be contacted and separated. The same applies to the other contact.

なお、通電軸１側の電流阻止部材６の深さは、底部２ａの厚さ以上としている。これは、通電軸１内においても半径方向に広がる電流成分によって磁界が発生するので、この影響を抑制するためである。また、通電軸１端では電流が絞られるが、スリット付き電極２に通電される所定の電流容量を有するものである。更に、電流阻止部材６の抵抗を補強部材５よりも高くすると、通電軸１側からの分流を抑制する効果が大きく、好ましいものとなる。   In addition, the depth of the current blocking member 6 on the energizing shaft 1 side is set to be equal to or greater than the thickness of the bottom portion 2a. This is because the magnetic field is generated by the current component spreading in the radial direction even in the energizing shaft 1, and this influence is suppressed. In addition, the current is narrowed at the end of the energizing shaft 1 but has a predetermined current capacity for energizing the slit electrode 2. Furthermore, if the resistance of the current blocking member 6 is made higher than that of the reinforcing member 5, the effect of suppressing the diversion from the current-carrying shaft 1 side is great, which is preferable.

上記実施例１の真空バルブによれば、通電軸１端の中央部に凹部１ａを設け、スリット付き電極２の底部２ａを貫通する電流阻止部材６を固定しているので、通電軸１内で電流の流れが外周側に広げられ、底部２ａで半径方向に広がる電流経路を短くすることができる。このため、底部２ａでの発生する磁界が小さくなり、外周部２ｂで発生させる磁界の分布が改善され、遮断特性を向上させることができる。   According to the vacuum valve of the first embodiment, since the recess 1a is provided in the central portion of the end of the energizing shaft 1 and the current blocking member 6 penetrating the bottom 2a of the electrode 2 with slit is fixed, The current flow is widened to the outer peripheral side, and the current path spreading in the radial direction at the bottom 2a can be shortened. For this reason, the magnetic field generated at the bottom portion 2a is reduced, the distribution of the magnetic field generated at the outer peripheral portion 2b is improved, and the cutoff characteristic can be improved.

次に、本発明の実施例２に係る真空バルブを図３を参照して説明する。図３は、本発明の実施例２に係る真空バルブに用いられる一方の接点を示す半断面図である。なお、この実施例２が実施例１と異なる点は、電流阻止部材の形状である。図３において、実施例１と同様の構成部分においては、同一符号を付し、その詳細な説明を省略する。   Next, a vacuum valve according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a half sectional view showing one contact used in the vacuum valve according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in the shape of the current blocking member. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

図３に示すように、通電軸１端の凹部１ａの底部を窪んだ円錐状とし、電流阻止部材６に突出した円錐状の突出部６ａを設けている。即ち、電流阻止部材６の通電軸１の軸方向の内部側を突出した円錐状としている。   As shown in FIG. 3, the bottom of the recess 1 a at the end of the current-carrying shaft 1 has a concave conical shape, and a conical protrusion 6 a that protrudes from the current blocking member 6 is provided. That is, the current blocking member 6 has a conical shape protruding from the inner side of the energizing shaft 1 in the axial direction.

上記実施例２の真空バルブによれば、実施例１による効果のほかに、通電軸１内での電流の流れを半径方向にスムースに広げることができる。   According to the vacuum valve of the second embodiment, in addition to the effects of the first embodiment, the current flow in the energizing shaft 1 can be smoothly spread in the radial direction.

次に、本発明の実施例３に係る真空バルブを図４、図５を参照して説明する。図４、図５は、本発明の実施例３に係る真空バルブに用いられる一方の接点を示す半断面図である。なお、この実施例３が実施例１と異なる点は、電流阻止部材の形状である。図４、図５において、実施例１と同様の構成部分においては、同一符号を付し、その詳細な説明を省略する。   Next, a vacuum valve according to Embodiment 3 of the present invention will be described with reference to FIGS. 4 and 5 are half sectional views showing one contact used in the vacuum valve according to the third embodiment of the present invention. The third embodiment is different from the first embodiment in the shape of the current blocking member. 4 and 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

図４に示すように、電流阻止部材６には、軸方向の中央部に中空部６ｂを設けている。中空部６ｂは、補強部材５面から凹部１ａ底面まで設けている。また、図５に示すように、電流阻止部材６の外径を、開口孔２ａ１や凹部１ａの内径よりも小さくし、空隙部６ｃを設けている。ここで、中空部６ｂと空隙部６ｃとを単に空隙部という。   As shown in FIG. 4, the current blocking member 6 is provided with a hollow portion 6 b in the central portion in the axial direction. The hollow portion 6b is provided from the reinforcing member 5 surface to the bottom surface of the concave portion 1a. Further, as shown in FIG. 5, the outer diameter of the current blocking member 6 is made smaller than the inner diameters of the opening hole 2a1 and the recess 1a, and a gap 6c is provided. Here, the hollow portion 6b and the gap portion 6c are simply referred to as a gap portion.

上記実施例３の真空バルブによれば、実施例１による効果のほかに、電流阻止部材６に空隙部を設けているので、通電軸１などから分流する電流を抑制することができる。特に、電流阻止部材６にスリット付き電極２と抵抗が大きく変わらない材料を用いた場合、分流する電流を抑制する効果が大きくなる。   According to the vacuum valve of the third embodiment, in addition to the effect of the first embodiment, the current blocking member 6 is provided with the gap, so that the current diverted from the energizing shaft 1 and the like can be suppressed. In particular, when the current blocking member 6 is made of a material whose resistance is not significantly different from that of the slit electrode 2, the effect of suppressing the diverted current is increased.

なお、上記実施例３では、電流阻止部材６に空隙部を設けて説明したが、接触子４を補強部材５で強固に固定することができる場合においては、電流阻止部材６そのものを設けないで、凹部１ａと開口孔２ａ１を空間部としてもよい。   In the third embodiment, the current blocking member 6 is provided with a gap. However, when the contact 4 can be firmly fixed by the reinforcing member 5, the current blocking member 6 itself is not provided. The recess 1a and the opening hole 2a1 may be a space.

次に、本発明の実施例４に係る真空バルブを図６を参照して説明する。図６は、本発明の実施例４に係る真空バルブに用いられる一方の接点を示す半断面図である。なお、この実施例４が実施例１と異なる点は、補強部材と電流阻止部材を一体化したことである。図６において、実施例１と同様の構成部分においては、同一符号を付し、その詳細な説明を省略する。   Next, a vacuum valve according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 6 is a half sectional view showing one contact used in the vacuum valve according to the fourth embodiment of the present invention. The fourth embodiment is different from the first embodiment in that the reinforcing member and the current blocking member are integrated. In FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

図６に示すように、電流阻止部材６には、これに連接されるとともに、底部１ａ面から接触子４まで形成された接点固定部６ｄを設けている。即ち、接触子４から通電軸１の凹部１ａの底面までを一体化させている。   As shown in FIG. 6, the current blocking member 6 is provided with a contact fixing portion 6 d connected to the current blocking member 6 and formed from the bottom 1 a surface to the contact 4. That is, the contact 4 to the bottom surface of the recess 1a of the energizing shaft 1 are integrated.

上記実施例４の真空バルブによれば、実施例１による効果のほかに、接触子４の固定と半径方向に電流の流れを広げる電流阻止部材６とを一体化させているので、部品点数を削減することができる。   According to the vacuum valve of the fourth embodiment, in addition to the effects of the first embodiment, the contact 4 is fixed and the current blocking member 6 that spreads the current flow in the radial direction is integrated. Can be reduced.

本発明の実施例１に係る真空バルブに用いられる一方の接点を示す半断面図。1 is a half cross-sectional view showing one contact used in a vacuum valve according to Embodiment 1 of the present invention. 本発明の実施例１に係る真空バルブに用いられる一方の接点を示す上面図。The top view which shows one contact used for the vacuum valve which concerns on Example 1 of this invention. 本発明の実施例２に係る真空バルブに用いられる一方の接点を示す半断面図。The half sectional view showing one contact used for the vacuum valve concerning Example 2 of the present invention. 本発明の実施例３に係る真空バルブに用いられる一方の接点を示す半断面図。The half sectional view showing one contact used for the vacuum valve concerning Example 3 of the present invention. 本発明の実施例３に係る真空バルブに用いられる一方の接点を示す半断面図。The half sectional view showing one contact used for the vacuum valve concerning Example 3 of the present invention. 本発明の実施例４に係る真空バルブに用いられる一方の接点を示す半断面図。The half sectional view showing one contact used for the vacuum valve concerning Example 4 of the present invention. 従来の真空バルブに用いられる一方の接点を示す半断面図。The half sectional view which shows one contact used for the conventional vacuum valve. 従来の真空バルブに用いられる一方の接点を示す上面図。The top view which shows one contact used for the conventional vacuum valve.

符号の説明Explanation of symbols

１ 通電軸
１ａ 凹部
２ スリット付き電極
２ａ 底部
２ａ１ 開口孔
２ｂ 外周部
３ スリット
４ 接触子
５ 補強部材
６ 電流阻止部材
６ａ 突出部
６ｂ 中空部
６ｃ 空隙部
６ｄ 接点固定部 DESCRIPTION OF SYMBOLS 1 Current supply shaft 1a Recessed part 2 Electrode with slit 2a Bottom part 2a1 Opening hole 2b Outer peripheral part 3 Slit 4 Contactor 5 Reinforcement member 6 Current blocking member 6a Projection part 6b Hollow part 6c Gap part 6d Contact fixing part

Claims (6)

接離自在の一対の接点を有する真空バルブにおいて、
前記接点は、底部が通電軸端に固着されたカップ状のスリット付き電極と、
前記スリット付き電極の開放端に固着された接触子と、
前記接触子と前記底部間に設けられた補強部材と、
前記底部を貫通するとともに、前記補強部材と前記通電軸間に設けられた電流阻止部材とを有し、
前記電流阻止部材を前記通電軸の軸方向の内部まで設けたことを特徴とする真空バルブ。 In a vacuum valve having a pair of contactable and separable contacts,
The contact is an electrode with a cup-like slit whose bottom is fixed to the end of the current-carrying shaft,
A contact secured to the open end of the slit electrode;
A reinforcing member provided between the contact and the bottom;
And having a current blocking member provided between the reinforcing member and the energizing shaft while penetrating the bottom portion,
A vacuum valve characterized in that the current blocking member is provided up to the inside of the energizing shaft in the axial direction. 前記電流阻止部材の前記通電軸側を突出した円錐状としたことを特徴とする請求項１に記載の真空バルブ。   The vacuum valve according to claim 1, wherein the current blocking member has a conical shape protruding from the energizing shaft side. 前記電流阻止部材に空隙部を設けたことを特徴とする請求項１または請求項２に記載の真空バルブ。   The vacuum valve according to claim 1, wherein a gap is provided in the current blocking member. 接離自在の一対の接点を有する真空バルブにおいて、
前記接点は、底部が通電軸端に固着されたカップ状のスリット付き電極と、
前記スリット付き電極の開放端に固着された接触子と、
前記底部を貫通するとともに、前記接触子と前記通電軸間に設けられた電流阻止部材とを有し、
前記電流阻止部材を前記通電軸の軸方向の内部まで設けたことを特徴とする真空バルブ。 In a vacuum valve having a pair of contactable and separable contacts,
The contact is an electrode with a cup-like slit whose bottom is fixed to the end of the current-carrying shaft,
A contact secured to the open end of the slit electrode;
A current blocking member provided between the contact and the current-carrying shaft while penetrating through the bottom;
A vacuum valve characterized in that the current blocking member is provided up to the inside of the energizing shaft in the axial direction. 前記電流阻止部材を絶縁材料で構成したことを特徴とする請求項１乃至請求項４のいずれか１項に記載の真空バルブ。   The vacuum valve according to any one of claims 1 to 4, wherein the current blocking member is made of an insulating material. 接離自在の一対の接点を有する真空バルブにおいて、
前記接点は、底部が通電軸端に固着されたカップ状のスリット付き電極と、
前記スリット付き電極の開放端に固着された接触子と、
前記接触子と前記底部間に設けられた補強部材とを有し、
前記底部に開口孔を設けるとともに、前記通電軸端に凹部を設けたことを特徴とする真空バルブ。 In a vacuum valve having a pair of contactable and separable contacts,
The contact is an electrode with a cup-like slit whose bottom is fixed to the end of the current-carrying shaft,
A contact secured to the open end of the slit electrode;
A reinforcing member provided between the contact and the bottom;
A vacuum valve characterized in that an opening hole is provided at the bottom and a recess is provided at the end of the energizing shaft.
JP2008260044A 2008-10-06 2008-10-06 Vacuum valve Active JP5210789B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012133988A (en) * 2010-12-21 2012-07-12 Japan Ae Power Systems Corp Electrode for vacuum circuit breaker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848320A (en) * 1981-09-16 1983-03-22 株式会社明電舎 Vacuum breaker
JPS60121636A (en) * 1983-09-23 1985-06-29 シ−メンス・アクチエンゲセルシヤフト Contactor unit of vacuum breaker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848320A (en) * 1981-09-16 1983-03-22 株式会社明電舎 Vacuum breaker
JPS60121636A (en) * 1983-09-23 1985-06-29 シ−メンス・アクチエンゲセルシヤフト Contactor unit of vacuum breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012133988A (en) * 2010-12-21 2012-07-12 Japan Ae Power Systems Corp Electrode for vacuum circuit breaker

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