JP2003187676A - Gas insulation circuit breaker - Google Patents
Gas insulation circuit breakerInfo
- Publication number
- JP2003187676A JP2003187676A JP2001390096A JP2001390096A JP2003187676A JP 2003187676 A JP2003187676 A JP 2003187676A JP 2001390096 A JP2001390096 A JP 2001390096A JP 2001390096 A JP2001390096 A JP 2001390096A JP 2003187676 A JP2003187676 A JP 2003187676A
- Authority
- JP
- Japan
- Prior art keywords
- fixed
- side main
- contactor
- arc
- support member
- 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
Landscapes
- Gas-Insulated Switchgears (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、発電所、変電
所、開閉所等で使用される電力用ガス絶縁開閉機器に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear for electric power used in power plants, substations, switchyards and the like.
【０００２】[0002]
【従来の技術】図４は従来のガス絶縁開閉機器の固定側
主接触子を示す正面図、及び図５は図４のＶ−Ｖ線の断
面と可動側主接触子とを示す側面図である。図４及び図
５において、平板状電極の可動側主接触子１は軸２を中
心に回動して、対向配置された固定側主接触子３と接離
する。可動側主接触子１の先端には可動側アーク接触子
４が設けられ、固定側主接触子３の先端には固定側アー
ク接触子５が設けられている。さらに、固定側主接触子
３の外側には、固定側主接触子３と電気的に接続された
電界遮蔽用シールド６が配置されている。そして、シー
ルド６は一端が固定側主接触子３に固着された支持部材
７と、支持部材７の他端に固着された曲面部８ａを有す
る耐アーク部材８とで構成されている。なお、耐アーク
部材８には銅−タングステン合金が使用され、支持部材
７には鉄合金、銅合金等が使用されて、耐アーク部材８
と支持部材７とは導電性のろう層を介して接合する。以
上のように構成することにより、両アーク接触子４，５
間が開離されたときに両アーク接触子４，５間に発生し
たアークが耐アーク部材８に移行してもシールド６が損
傷するのを防止している。さらに、耐アーク部材８に曲
面部８ａを形成したことにより、電界緩和をしている。2. Description of the Related Art FIG. 4 is a front view showing a fixed side main contactor of a conventional gas-insulated switchgear, and FIG. 5 is a side view showing a cross section taken along line VV of FIG. 4 and a movable side main contactor. is there. In FIG. 4 and FIG. 5, the movable side main contactor 1 of the flat plate-shaped electrode rotates about the shaft 2 and comes in contact with and separates from the fixed side main contactor 3 which is arranged to face it. A movable side arc contactor 4 is provided at the tip of the movable side main contactor 1, and a fixed side arc contactor 5 is provided at the tip of the fixed side main contactor 3. Further, an electric field shielding shield 6 electrically connected to the fixed-side main contact 3 is arranged outside the fixed-side main contact 3. The shield 6 is composed of a support member 7 having one end fixed to the fixed side main contactor 3, and an arc resistant member 8 having a curved surface portion 8a fixed to the other end of the support member 7. The arc-resistant member 8 is made of a copper-tungsten alloy, the support member 7 is made of an iron alloy, a copper alloy, or the like.
And the supporting member 7 are bonded to each other via a conductive brazing layer. With the above configuration, both arc contacts 4, 5
The shield 6 is prevented from being damaged even if the arc generated between the arc contacts 4 and 5 when the space is separated is transferred to the arc resistant member 8. Further, the curved portion 8a is formed on the arc resistant member 8 to alleviate the electric field.
【０００３】[0003]
【発明が解決しようとする課題】従来のガス絶縁開閉機
器は以上のように構成されているので、耐アーク部材８
の銅−タングステン合金と、支持部材７の鉄合金、銅合
金等とを導電性のろう層を介して接合するため、両部材
７，８として使用可能な材料の種類が制約されると共
に、接合した後での加工が困難であるという問題点があ
った。この発明は以上のような問題点を解消するために
なされたもので、使用材料の選択の自由度を向上させる
と共に、機械加工を容易に行うことができるガス絶縁開
閉機器を提供することを目的としたものである。Since the conventional gas-insulated switchgear is constructed as described above, the arc-proof member 8
Since the copper-tungsten alloy and the iron alloy, the copper alloy, etc. of the support member 7 are joined via the conductive brazing layer, the types of materials that can be used as both members 7 and 8 are restricted, and the joining is performed. However, there is a problem in that it is difficult to perform the processing after the processing. The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas-insulated switchgear capable of improving the degree of freedom in selection of materials used and facilitating machining. It is what
【０００４】[0004]
【課題を解決するための手段】この発明に係わるガス絶
縁開閉機器は、絶縁ガスが封入された金属容器内に接離
可能な固定側主接触子及び可動側主接触子と、固定側主
接触子と電気的に接続されて固定側接触子に固着された
固定側アーク接触子と、可動側主接触子と電気的に接続
されて可動側主接触子の先端側に固着され、固定側アー
ク接触子と接離可能な可動側アーク接触子と、固定側主
接触子及び固定側アーク接触子の外側に配置された電界
遮蔽用シールドとが配置されたガス絶縁開閉機器におい
て、電界遮蔽用シールドは固定側主接触子に電気的に接
続されて一端が固定側主接触子に固着され他端に貫通穴
が形成された支持部材と、固定側主接触子の先端部を覆
うように支持部材の他端に配置され、支持部材側とは反
対側に突状の曲面部が形成され、支持部材側にねじ部が
形成された耐アーク部材と、支持部材の貫通穴を貫通し
て耐アーク部材のねじ部に螺合され、支持部材に耐アー
ク部材を固定したボルトとで構成されたものである。ま
た、可動側主接触子は平板状電極で、固定側主接触子は
平板状電極が挿入可能に形成された対向電極である。さ
らに、可動側主接触子は棒状に形成された棒状電極で、
固定側主接触子は棒状電極が挿入可能に形成された管状
電極である。A gas-insulated switchgear according to the present invention is a fixed-side main contact, a fixed-side main contactor and a movable-side main contactor which can be contacted and separated from each other in a metal container in which an insulating gas is sealed. Fixed side arc contactor that is electrically connected to the fixed side contactor and fixed side arc that is electrically connected to the movable side main contactor and fixedly attached to the tip side of the movable side main contactor In a gas-insulated switchgear in which a movable arc contactor that can be brought into contact with and separated from a contactor and an electric field shielding shield arranged outside the fixed main contactor and the fixed arc contactor are arranged, an electric field shielding shield Is a support member that is electrically connected to the fixed-side main contact and has one end fixed to the fixed-side main contact and a through hole formed in the other end, and a support member that covers the tip of the fixed-side main contact. Is located at the other end of the And an arc resistant member having a threaded portion formed on the support member side, and a bolt that is screwed into the threaded portion of the arc resistant member through the through hole of the support member and that fixes the arc resistant member to the support member. It is composed of. The movable side main contactor is a flat electrode, and the fixed side main contactor is a counter electrode into which the flat electrode can be inserted. Furthermore, the movable side main contact is a rod-shaped electrode formed in a rod shape,
The fixed-side main contactor is a tubular electrode into which a rod-shaped electrode can be inserted.
【０００５】[0005]
【発明の実施の形態】実施の形態１．図１は実施の形態
１のガス絶縁機器の固定側主接触子を示す正面図、及び
図２は図１のＩＩ−ＩＩ線の断面と可動側主接触子とを
示す側面図である。図１及び図２において、９はフィン
ガー状の固定側主接触子で、対向電極になるように構成
されている。１０は固定側アーク接触子で、固定側主接
触子９と電気的に接続されて固定側主接触子９に固着さ
れている。１１は軸１２を中心にして回動可能な平板状
電極の可動側主接触子で、固定側主接触子と接離可能で
ある。１３は固定側アーク接触子１０と接離可能な可動
側アーク接触子で、可動側主接触子１１と電気的に接続
されて可動側主接触子１１に固着されている。１４は固
定側主接触子９に電気的に接続されて、固定側主接触子
９の外側に配置された支持部材で、一端が固定側主接触
子９側に固着され、他端に貫通穴１４ａが形成されてい
る。なお、支持部材１４はアルミニウム、アルミニウム
合金、銅、銅合金及び鉄合金のいずれかが使用されてい
る。１５は固定側主接触子９の先端部を覆うように支持
部材１４の他端に配置された耐アーク部材で、支持部材
１４とは反対側に突状の曲面部１５ａが形成されると共
に、支持部材１４側にねじ部１５ｂが形成されている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a front view showing a fixed-side main contactor of a gas-insulated device according to a first embodiment, and FIG. 2 is a side view showing a cross section taken along line II-II of FIG. 1 and a movable-side main contactor. In FIGS. 1 and 2, reference numeral 9 denotes a finger-shaped fixed-side main contactor, which is configured to serve as a counter electrode. Reference numeral 10 denotes a fixed-side arc contactor, which is electrically connected to the fixed-side main contactor 9 and fixed to the fixed-side main contactor 9. Reference numeral 11 denotes a movable side main contactor of a flat plate-shaped electrode which is rotatable around a shaft 12 and can be brought into contact with and separated from the fixed side main contactor. Reference numeral 13 denotes a movable arc contactor capable of coming into contact with and separating from the fixed arc contactor 10, which is electrically connected to the movable main contact 11 and fixed to the movable main contact 11. Reference numeral 14 denotes a support member that is electrically connected to the fixed-side main contact 9 and is arranged outside the fixed-side main contact 9. The one end is fixed to the fixed-side main contact 9 and the other end is a through hole. 14a is formed. The support member 14 is made of aluminum, aluminum alloy, copper, copper alloy, or iron alloy. Reference numeral 15 denotes an arc-resistant member arranged at the other end of the support member 14 so as to cover the tip of the fixed-side main contactor 9. The arc-shaped member 15 has a projecting curved surface portion 15a formed on the side opposite to the support member 14. A screw portion 15b is formed on the support member 14 side.
【０００６】なお、耐アーク部材１４は銅、銅合金、
鉄、鉄合金及び銅−タングステン合金のいずれかが使用
されている。そして、支持部材１４と耐アーク部材１５
とでシールド１６が構成されている。１７は耐アーク部
材１５を支持部材１４に固定したボルトで、支持部材１
４の貫通穴１４ａを貫通して耐アーク部材１５の曲面部
１５ａの反対側からねじ部１５ｂに螺合されている。以
上のように、支持部材１４の貫通穴１４ａを貫通したボ
ルト１７を耐アーク部材１５の曲面部１５ａの反対側の
ねじ部１５ｂに螺合して、耐アーク部材１５を支持部材
１４に固定したことにより、支持部材１４及び耐アーク
部材１５の材料の種類に制約を受けることなく組立てを
容易に行うことができる。さらに、耐アーク部材１５を
支持部材１４に固着する前に、支持部材１４及び耐アー
ク部材１５の加工をそれぞれ行うことができるので、加
工を容易に行うことができる。The arc resistant member 14 is made of copper, copper alloy,
Either iron, iron alloys or copper-tungsten alloys have been used. Then, the support member 14 and the arc resistant member 15
The shield 16 is composed of and. Reference numeral 17 is a bolt for fixing the arc resistant member 15 to the support member 14,
4 through the through hole 14a, and is screwed into the screw portion 15b from the side opposite to the curved surface portion 15a of the arc resistant member 15. As described above, the bolt 17 penetrating the through hole 14a of the support member 14 is screwed into the screw portion 15b on the opposite side of the curved surface portion 15a of the arc resistant member 15 to fix the arc resistant member 15 to the support member 14. As a result, the assembly can be easily performed without being restricted by the kinds of materials of the support member 14 and the arc resistant member 15. Furthermore, since the support member 14 and the arc resistant member 15 can be processed before the arc resistant member 15 is fixed to the support member 14, the processing can be easily performed.
【０００７】実施の形態２．図３は実施の形態２の構成
を示す断面図である。図３において、１８はフィンガー
状の固定側主接触子で、円周上に管状電極になるように
複数個配置されている。１９は固定側主接触子１８の中
心軸上に配置された固定側アーク接触子で、固定側主接
触子１８と電気的に接続されている。２０は棒状電極の
可動側主接触子で、固定側主接触子１８の軸方向に移動
して固定側主接触子１８及び固定側アーク接触子１９と
接離可能である。２１は可動側主接触子２０の先端に固
着された可動側アーク接触子で、可動側主接触子２０と
電気的に接続されている。なお、両接触子１８，２０間
が閉路されるときは、両アーク接触子１９，２１が最初
に閉路し、続いて固定側主接触子１８，２０間が閉路す
る。一方、両主接触子１８，２０が開路されるときは、
両主接触子１８，２０間が最初に開路して、最後に両ア
ーク接触子１９，２１間が開路する。これにより、両ア
ーク接触子１９，２１に遮断電流によるアークが発生す
るように構成されている。２２は固定側主接触子１８と
電気的に接続されて、固定側主接触子１８の外側に配置
された支持部材で、一端が固定側主接触子１８側に固着
され、他端に貫通穴２２ａが形成されている。Embodiment 2. FIG. 3 is a sectional view showing the configuration of the second embodiment. In FIG. 3, 18 is a finger-shaped fixed-side main contactor, and a plurality of them are arranged on the circumference so as to form a tubular electrode. A fixed-side arc contactor 19 is arranged on the central axis of the fixed-side main contactor 18, and is electrically connected to the fixed-side main contactor 18. Reference numeral 20 denotes a movable-side main contactor of a rod-shaped electrode, which can move in the axial direction of the fixed-side main contactor 18 to come into contact with and separate from the fixed-side main contactor 18 and the fixed-side arc contactor 19. Reference numeral 21 denotes a movable side arc contactor fixed to the tip of the movable side main contactor 20, which is electrically connected to the movable side main contactor 20. When the contacts 18 and 20 are closed, the arc contacts 19 and 21 are closed first, and then the fixed-side main contacts 18 and 20 are closed. On the other hand, when both main contactors 18, 20 are opened,
The main contacts 18, 20 are opened first, and finally the arc contacts 19, 21 are opened. As a result, an arc due to a breaking current is generated in both arc contacts 19 and 21. Reference numeral 22 denotes a support member that is electrically connected to the fixed-side main contact 18 and is arranged outside the fixed-side main contact 18. One end is fixed to the fixed-side main contact 18 and the other end is a through hole. 22a is formed.
【０００８】なお、支持部材２２はアルミニウム、アル
ミニウム合金、銅、銅合金及び鉄合金のいずれかが使用
されている。２３は固定側主接触子１８の先端部を覆う
ように支持部材２２の他端に配置された耐アーク部材
で、支持部材２２とは反対側に突状の曲面部２３ａが形
成されると共に、支持部材２２側にねじ部２３ｂが形成
されている。なお、耐アーク部材２３は銅、銅合金、
鉄、鉄合金及び銅−タングステン合金のいずれかが使用
されている。そして、支持部材２２と耐アーク部材２３
とでシールド２４が構成されている。２５は耐アーク部
材２３を支持部材２２に固定したボルトで、支持部材２
２の貫通穴２２ａを貫通して耐アーク部材２３の曲面部
２３ａの反対側からねじ部２３ｂに螺合されている。以
上のように、支持部材２２の貫通穴２２ａを貫通したボ
ルト２５を耐アーク部材２３の曲面部２３ａの反対側の
ねじ部２３ｂに螺合して、耐アーク部材２３を支持部材
２２に固定したことにより、支持部材２２及び耐アーク
部材２３の材料の種類に制約を受けることなく組立てを
容易に行うことができる。さらに、耐アーク部材２３を
支持部材２２に固着する前に、支持部材２２及び耐アー
ク部材２３の加工をそれぞれ行うことができるので、加
工を容易に行うことができる。The support member 22 is made of aluminum, aluminum alloy, copper, copper alloy or iron alloy. Reference numeral 23 is an arc-resistant member arranged at the other end of the support member 22 so as to cover the tip of the fixed-side main contact 18, and a curved surface portion 23a having a projecting shape is formed on the side opposite to the support member 22. A screw portion 23b is formed on the support member 22 side. The arc resistant member 23 is made of copper, copper alloy,
Either iron, iron alloys or copper-tungsten alloys have been used. Then, the support member 22 and the arc resistant member 23
And constitute a shield 24. Numeral 25 is a bolt for fixing the arc resistant member 23 to the support member 22.
The arc-proof member 23 is screwed into the screw portion 23b from the opposite side of the curved surface portion 23a through the second through hole 22a. As described above, the bolt 25 penetrating the through hole 22a of the support member 22 is screwed into the screw portion 23b on the opposite side of the curved surface portion 23a of the arc resistant member 23 to fix the arc resistant member 23 to the support member 22. As a result, the assembly can be easily performed without being restricted by the kinds of materials of the support member 22 and the arc resistant member 23. Furthermore, since the support member 22 and the arc resistant member 23 can be processed before the arc resistant member 23 is fixed to the support member 22, the processing can be performed easily.
【０００９】[0009]
【発明の効果】この発明によれば、支持部材の貫通穴を
貫通したボルトを耐アーク部材の曲面部の反対側のねじ
部に螺合して、耐アーク部材を支持部材に固定したこと
により、支持部材及び耐アーク部材の材料の種類に制約
を受けることなく組立てを容易に行うことができる。さ
らに、耐アーク部材を支持部材に固着する前に、支持部
材及び耐アーク部材の加工をそれぞれ行うことができる
ので、加工を容易に行うことができる。また、可動側主
接触子を平板状電極として、固定側主接触子を平板状電
極が挿入可能な対向電極としても容易に構成することが
できる。さらに、可動側主接触子を棒状に形成された棒
状電極として、固定側主接触子を棒状電極が挿入可能な
管状電極としても容易に構成することができる。According to the present invention, the bolt that penetrates the through hole of the support member is screwed into the threaded portion on the opposite side of the curved surface portion of the arc resistant member to fix the arc resistant member to the support member. Assembling can be easily performed without being restricted by the types of materials of the supporting member and the arc resistant member. Furthermore, since the support member and the arc resistant member can be processed before the arc resistant member is fixed to the support member, the processing can be easily performed. Further, the movable-side main contact can be easily configured as a flat electrode, and the fixed-side main contact can be easily configured as a counter electrode into which the flat-shaped electrode can be inserted. Furthermore, the movable main contact can be easily configured as a rod-shaped electrode formed in a rod shape, and the fixed main contact can be easily configured as a tubular electrode into which the rod-shaped electrode can be inserted.
【図１】 この発明の実施の形態１のガス絶縁機器の固
定側接触子を示す正面図である。FIG. 1 is a front view showing a stationary contact of a gas insulation device according to a first embodiment of the present invention.
【図２】 図１のＩＩ−ＩＩ線の断面と可動側主接触子
とを示す側面図である。FIG. 2 is a side view showing a cross section taken along line II-II of FIG. 1 and a movable side main contactor.
【図３】 この発明の実施の形態２の構成を示す断面図
である。FIG. 3 is a sectional view showing a configuration of a second embodiment of the present invention.
【図４】 従来のガス絶縁開閉機器の固定側接触子を示
す正面図である。FIG. 4 is a front view showing a fixed contact of a conventional gas-insulated switchgear.
【図５】 図４のＶ−Ｖ線の断面と可動側接触子とを示
す側面図である。5 is a side view showing a cross section taken along line VV of FIG. 4 and a movable contact.
９，１８ 固定側主接触子、１０，１９ 固定側アーク
接触子、１１，２０ 可動側主接触子、１３，２１ 可
動側アーク接触子、１４，２２ 支持部材、１５，２３
耐アーク部材、１５ａ，２３ａ 曲面部、１７，２５
ボルト、１６，２４ シールド。9,18 Fixed side main contactor, 10,19 Fixed side arc contactor, 11,20 Movable side main contactor, 13,21 Movable side arc contactor, 14,22 Support member, 15,23
Arc resistant member, 15a, 23a Curved surface portion, 17, 25
Bolts, 16 and 24 shields.
Claims (3)
可能な固定側主接触子及び可動側主接触子と、上記固定
側主接触子と電気的に接続されて上記固定側接触子に固
着された固定側アーク接触子と、上記可動側主接触子と
電気的に接続されて上記可動側主接触子の先端側に固着
され、上記固定側アーク接触子と接離可能な可動側アー
ク接触子と、上記固定側主接触子及び上記固定側アーク
接触子の外側に配置された電界遮蔽用シールドとが配置
されたガス絶縁開閉機器において、上記電界遮蔽用シー
ルドは上記固定側主接触子に電気的に接続されて一端が
上記固定側主接触子に固着され他端に貫通穴が形成され
た支持部材と、上記固定側主接触子の先端部を覆うよう
に上記支持部材の他端に配置され、上記支持部材側とは
反対側に突状の曲面部が形成され、上記支持部材側にね
じ部が形成された耐アーク部材と、上記支持部材の上記
貫通穴を貫通して上記耐アーク部材の上記ねじ部に螺合
され、上記支持部材に上記耐アーク部材を固定したボル
トとで構成されていることを特徴とするガス絶縁開閉機
器。1. A stationary main contact and a movable main contact that can be contacted and separated from each other in a metal container filled with an insulating gas, and the stationary contact that is electrically connected to the stationary main contact. A fixed side arc contactor fixedly attached to the movable side main contactor is electrically connected to the movable side main contactor and is fixed to the tip side of the movable side main contactor, and the movable side is movable to and from the fixed side arc contactor. In a gas-insulated switchgear in which an arc contactor and the fixed side main contactor and an electric field shielding shield arranged outside the fixed side arc contactor are arranged, the electric field shielding shield is the fixed side main contact. A support member that is electrically connected to the child and has one end fixed to the fixed-side main contactor and a through hole formed in the other end; and the support member other than the support member that covers the tip of the fixed-side main contactor. A curved surface that is arranged at the end and that is projecting on the side opposite to the support member side Part is formed, and the arc-resistant member in which the threaded part is formed on the support member side, and the threaded part of the arc-resistant member through the through hole of the support member is screwed to the support member A gas-insulated switchgear comprising a bolt to which an arc resistant member is fixed.
は平板状電極で、上記固定側主接触子は上記平板状電極
が挿入可能に形成された対向電極であることを特徴とす
るガス絶縁開閉機器。2. The gas according to claim 1, wherein the movable-side main contactor is a flat plate-shaped electrode, and the fixed-side main contactor is a counter electrode in which the flat-plate-shaped electrode can be inserted. Insulation switchgear.
は棒状に形成された棒状電極で、上記固定側主接触子は
上記棒状電極が挿入可能に形成された管状電極であるこ
とを特徴とするガス絶縁開閉機器。3. The movable-side main contactor according to claim 1, wherein the movable-side main contactor is a rod-shaped electrode, and the fixed-side main contactor is a tubular electrode into which the rod-shaped electrode can be inserted. And gas insulated switchgear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001390096A JP4188593B2 (en) | 2001-12-21 | 2001-12-21 | Gas insulated switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001390096A JP4188593B2 (en) | 2001-12-21 | 2001-12-21 | Gas insulated switchgear |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003187676A true JP2003187676A (en) | 2003-07-04 |
| JP4188593B2 JP4188593B2 (en) | 2008-11-26 |
Family
ID=27598126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001390096A Expired - Fee Related JP4188593B2 (en) | 2001-12-21 | 2001-12-21 | Gas insulated switchgear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4188593B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010150390A1 (en) | 2009-06-25 | 2010-12-29 | 三菱電機株式会社 | Gas insulated switchgear |
-
2001
- 2001-12-21 JP JP2001390096A patent/JP4188593B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010150390A1 (en) | 2009-06-25 | 2010-12-29 | 三菱電機株式会社 | Gas insulated switchgear |
| US8878092B2 (en) | 2009-06-25 | 2014-11-04 | Mitsubishi Electric Corporation | Gas-insulated switchgear |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4188593B2 (en) | 2008-11-26 |
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