JPH07212945A - Gas-insulated bus bar - Google Patents

Abstract

PURPOSE:To suppress an electric field intensity on a conductor joint part and reduce the dimensions of a bus bar by a method wherein a buffer layer with which a conductor around which an insulating layer is formed is bonded to a bushing insulating layer is provided and, further, a gas pipe is provided so as to surround the center conductor and the center conductor is connected to the other bushing. CONSTITUTION:An insulating layer 10 is formed around an approximately T-shaped conductor 9 in an insulated bushing 7 which is fixed to a frame 11. A gas pipe 15 is fixed to the insulating layer 10 by a bolt 17 through an O--ring 16 and, further, the end of the gas pipe 15 on the side where no switchboard is provided is sealed with an insulating plug 19 and cut off. Insulating gas 18 is enclosed into the gas pipe 15 with a gas pressure approximately the same as the pressure in a housing. In the gas tube 15 side, a bushing 22 which has a contactor 13 which is brought into contact with the conductor 9 on its one side and has a contactor 21 which is brought into contact with a bushing 20 from an adjacent switchboard on the other side is fixed to the insulating layer 10 with the O-ring 16 between the gas pipe 15 and itself. With this constitution, the irregularities of an electric field intensity in the bushing between the switchboards can be suppressed and the dimensions of the bushing can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、ガス絶縁閉鎖配電盤の
盤相互間を接続するガス絶縁母線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated bus bar which connects between panels of a gas-insulated closed switchboard.

【０００２】[0002]

【従来の技術】代表的なガス絶縁閉鎖配電盤の一例を示
す図６において、密封構造の金属箱体１の中間やや前方
（図示左寄り）には、箱体１を前後にガス区分する隔壁
１ａが設けられている。この隔壁１ａの前面には逆コ字
状の隔壁１ｂが取付けられ、隔壁１ａの後面と天井間に
は逆Ｌ字状の隔壁１ｃが取付けられ、箱体１の後部には
略Ｚ字状の隔壁１ｂが取付けられている。隔壁１ａと隔
壁１ｂ間は、例えば六ふっ化硫黄ガス（以下、絶縁ガス
という）が封入され、真空遮断器５が収納された遮断器
室１ｈを形成している。2. Description of the Related Art In FIG. 6 showing an example of a typical gas-insulated closed switchboard, a partition wall 1a for partitioning the box body 1 into front and rear gas is provided in the middle and slightly forward of the sealed metal box body 1 (to the left in the drawing). It is provided. An inverted U-shaped partition wall 1b is mounted on the front surface of the partition wall 1a, an inverted L-shaped partition wall 1c is mounted between the rear surface of the partition wall 1a and the ceiling, and a substantially Z-shaped partition is mounted on the rear portion of the box body 1. The partition wall 1b is attached. A space between the partition walls 1a and 1b is filled with, for example, sulfur hexafluoride gas (hereinafter, referred to as an insulating gas) to form a circuit breaker chamber 1h in which a vacuum circuit breaker 5 is housed.

【０００３】一方、隔壁１ａと隔壁１ｃ間は、天井部後
方に絶縁ブッシング７が貫設され、その下部には後側が
絶縁ブッシング７に接続された断路器４Ａが取付けられ
る。また天井部前方に変流器６が取付けられ、この変流
器６の後端は断路器４Ａの前側に接続され、前端は隔壁
１ａに貫設された絶縁スペーサ８Ａを介して真空遮断器
５ａの上極に接続され、内部に絶縁ガスが封入されて母
線室１ｆを形成している。On the other hand, between the partition wall 1a and the partition wall 1c, an insulating bushing 7 is provided at the rear of the ceiling portion, and a disconnector 4A whose rear side is connected to the insulating bushing 7 is attached to the lower part thereof. Further, a current transformer 6 is attached to the front of the ceiling portion, the rear end of the current transformer 6 is connected to the front side of the disconnector 4A, and the front end is connected to a vacuum circuit breaker 5a through an insulating spacer 8A penetrating the partition wall 1a. Is connected to the upper pole and is filled with an insulating gas to form a bus chamber 1f.

【０００４】更に、隔壁１ｃと隔壁１ｄとの間には、隔
壁１ａの下部後面に上極が同じく隔壁中間部に貫設され
た絶縁スペーサ８Ｂを介して真空遮断器５ａの下極に接
続された断路器４Ｂが取付けられる。後方の天井部には
避雷器３が断路棒３ａを下方にして貫設され、断路器４
Ｂの下極と避雷器３の下端が隔壁１ｄの内側のブッシン
グ３ｂに接続された受電室１ｃを形成し、ブッシング３
ｂと断路器４Ｂ間にはがいし３ｃに支えられた導体３ｄ
が配設され、その内部には絶縁ガスが封入されている。Further, between the partition wall 1c and the partition wall 1d, the upper pole is connected to the lower pole of the vacuum circuit breaker 5a through an insulating spacer 8B which is also penetrated in the middle portion of the partition wall on the lower rear surface of the partition wall 1a. The disconnector 4B is attached. A lightning arrester 3 is pierced at the rear ceiling part with the disconnecting rod 3a facing downward,
The lower pole of B and the lower end of the lightning arrester 3 form a power receiving chamber 1c connected to a bushing 3b inside the partition wall 1d.
The conductor 3d supported by the peeler 3c between the switch b and the disconnector 4B
Is provided, and an insulating gas is enclosed in the interior thereof.

【０００５】一方、隔壁１ｄの後方は、床面からケーブ
ル２が立上って、隔壁１ｄに貫設されたケーブルヘッド
２ａに接続されたケーブル室１ｇを形成している。この
ように構成されるガス絶縁閉鎖配電盤を列盤する場合に
は、例えば特開平２−262810に開示されている通り、絶
縁ブッシング間７−７はガス絶縁母線で接続される。On the other hand, behind the partition wall 1d, the cable 2 rises from the floor surface to form a cable chamber 1g connected to a cable head 2a penetrating the partition wall 1d. When the gas-insulated closed switchboards configured as described above are arranged in rows, for example, as disclosed in JP-A-2-262810, the insulating bushings 7-7 are connected by gas-insulated buses.

【０００６】このガス絶縁母線を図７に示すが、列盤時
の左右の盤で同様の構造となるので、一方端について説
明する。絶縁ブッシング７は、略Ｔ形の導体９の周囲
と、例えばエポキシ樹脂より成る絶縁層10を形成し、フ
レーム11に固定されている。下方の導体９ａには電気機
器へ接続され、また左右に貫通された導体９ｂには接続
導体12が貫通し、接触子13によって導体９ｂと電気的に
接続されている。接続導体12は耐電圧向上を図るための
絶縁層14で覆われており、これらは伸縮自在のガス管15
に収納されている。ガス管15は端部にＯリング16を介し
て絶縁層10にボルト17で固定され、絶縁ガス18が封入さ
れている。This gas-insulated bus bar is shown in FIG. 7. Since the left and right boards in the row board have the same structure, one end will be described. The insulating bushing 7 is fixed to the frame 11 by forming an insulating layer 10 made of, for example, epoxy resin around the substantially T-shaped conductor 9. The lower conductor 9a is connected to an electric device, the conductor 9b penetrating left and right is penetrated by a connecting conductor 12, and is electrically connected to the conductor 9b by a contactor 13. The connecting conductor 12 is covered with an insulating layer 14 for improving withstand voltage, and these are expandable gas pipes 15
It is stored in. The gas pipe 15 is fixed to the insulating layer 10 with bolts 17 at the end through an O-ring 16, and an insulating gas 18 is filled therein.

【０００７】一方、接続導体12がない側は絶縁栓19で封
じ切られている。ここで、耐電圧を向上させる絶縁層14
は、例えば誘電率が約５のエポキシ樹脂より成り、接続
導体12からの電子放出を抑制したり絶縁層14の表面の電
界強度を低下させて絶縁ガス18の電離を抑制する等の効
果を持っている。On the other hand, the side without the connecting conductor 12 is completely sealed with an insulating plug 19. Here, the insulating layer 14 that improves the withstand voltage is used.
Is made of, for example, an epoxy resin having a dielectric constant of about 5 and has the effect of suppressing the emission of electrons from the connecting conductor 12 and reducing the electric field strength on the surface of the insulating layer 14 to suppress the ionization of the insulating gas 18. ing.

【０００８】[0008]

【発明が解決しようとする課題】しかしながら、このよ
うなガス絶縁母線は、絶縁層14が裸の接続導体12と比べ
て耐電圧の向上にあるものの、誘電率が大きいため限界
を生じる。つまり、ガス管15との電位分担を考えてみる
と、絶縁ガスの誘電率が約１のために殆どの電位がガス
ギャップに分担され、絶縁層14の表面の電界強度は大き
く低下しない。However, although such a gas-insulated bus bar has a higher dielectric strength than the bare connecting conductor 12 in the insulating layer 14, it has a limit because of its large dielectric constant. That is, considering the potential sharing with the gas pipe 15, most of the potential is shared with the gas gap because the dielectric constant of the insulating gas is about 1, and the electric field strength on the surface of the insulating layer 14 does not significantly decrease.

【０００９】また破壊の起点は、導体９ｂの端部から絶
縁層14の沿面を追ってガスギャップ空間を介してガス管
15に達する。これは、絶縁層14の電界強度が上昇するた
め、この部分で電離が進んで電極となる導体９ｂ端部よ
り破壊を誘起させるものと考えられる。従って、絶縁層
14の電界強度を低下させなければ、耐電圧の向上は見ら
れないと考えられる。Further, the starting point of the destruction is that the end of the conductor 9b is followed by the creeping surface of the insulating layer 14 through the gas gap space and the gas pipe.
Reach 15 It is considered that this is because, because the electric field strength of the insulating layer 14 increases, ionization proceeds at this portion, and destruction is induced from the end of the conductor 9b serving as an electrode. Therefore, the insulating layer
It is considered that the withstand voltage is not improved unless the electric field strength of 14 is reduced.

【００１０】このため、絶縁層14を薄くしてガスギャッ
プを広げると、絶縁層14表面の電界強度は低下するもの
の、絶縁層14自体の破壊電圧が低下してしまう。また、
ガス圧力を上昇させ破壊する電界強度を上昇させること
も考えられるが、箱体１の封入圧力と異なったガス圧力
の管理をしなくてはならなくなる。特に、ガス圧力を上
昇させることは、ガス管15が圧力容器となって法的な規
制を受けると共に、重量が増加し、製作が困難となる。
これらのことより、ガス絶縁母線の縮小化には限界があ
った。本発明の目的は、導体接続部の電界強度を抑制し
て縮小化が図れるガス絶縁母線を提供することにある。Therefore, if the insulating layer 14 is thinned to widen the gas gap, the electric field strength on the surface of the insulating layer 14 is lowered, but the breakdown voltage of the insulating layer 14 itself is lowered. Also,
It is conceivable to increase the gas pressure to increase the electric field strength for destruction, but it is necessary to manage the gas pressure different from the enclosure pressure of the box body 1. In particular, increasing the gas pressure causes the gas pipe 15 to act as a pressure vessel and is legally regulated, and also increases the weight, making manufacturing difficult.
For these reasons, there is a limit to the reduction of the gas-insulated bus bar. An object of the present invention is to provide a gas-insulated busbar that can suppress the electric field strength of a conductor connecting portion and can be reduced in size.

【００１１】[0011]

【課題を解決するための手段】上記目的を達成するため
に本発明は、内部に絶縁ガスが封入され電気機器が収納
された箱体間を、箱体の夫々の外壁に設けられたブッシ
ングを介して接続するガス絶縁母線において、ブッシン
グ間に配設され周囲に絶縁層を形成した中心導体と、中
心導体の一方のブッシング側表面に形成され、このブッ
シングの絶縁層と中心導体を接着させる緩衝層と、伸縮
部を有すると共に、絶縁層が形成された中心導体を包囲
するように設けられガス管とを備え、ガス管の他方のブ
ッシング側の径を一方のブッシング側の径よりも大きく
して中心導体と他方のブッシングを接続したことを要旨
とするものである。In order to achieve the above-mentioned object, the present invention provides a bushing provided on each outer wall of a box body between the box bodies in which an insulating gas is sealed and electric equipment is housed. In a gas-insulated busbar connected via a central conductor that is disposed between bushings and has an insulating layer formed around it, and a buffer that is formed on one bushing-side surface of the central conductor and that bonds the insulating layer of this bushing and the central conductor A gas pipe having a layer and a stretchable portion and surrounding the central conductor on which the insulating layer is formed, and the diameter of the other bushing side of the gas pipe is made larger than the diameter of one bushing side. The gist is that the central conductor is connected to the other bushing.

【００１２】[0012]

【作用】このような構成において、盤間のブッシングは
電界強度の乱れが少なくなることにより小形化でき、絶
縁ガス中で接続される接続部ではガス管が太径で適切な
ガス絶縁距離が保たれるので、良好な絶縁性能が維持で
きる。In such a structure, the bushing between the panels can be downsized by reducing the disturbance of the electric field strength, and the gas pipe has a large diameter at the connection portion connected in the insulating gas to maintain an appropriate gas insulation distance. Since it drips, good insulation performance can be maintained.

【００１３】[0013]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。図１は、本発明のガス絶縁母線を適用した絶縁
ブッシング７の断面図である。同図において、絶縁ブッ
シング７は略Ｔ形の導体９の周囲に絶縁層10を形成させ
てフレーム11に固定される。またガス管15は、Ｏリング
16を介してボルト17で絶縁層10に固定されると共に、列
盤をしない側の端部は絶縁栓19で封じ切られ、絶縁ガス
18が箱体１と同程度のガス圧力で封入されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an insulating bushing 7 to which the gas-insulated bus bar of the present invention is applied. In the figure, the insulating bushing 7 is fixed to the frame 11 by forming an insulating layer 10 around a substantially T-shaped conductor 9. The gas pipe 15 is an O-ring.
It is fixed to the insulating layer 10 with a bolt 17 via 16 and the end not on the row board is sealed off with an insulating plug 19 to prevent the insulating gas.
18 is sealed at the same gas pressure as the box 1.

【００１４】ここで、ガス管15側においては、一方が導
体９と接続する接触子13を配置し、他方が隣接盤からの
ブッシング20と接続する接触子21を配置したブッシング
22が、ガス管15との間にＯリング16を介して絶縁層10に
固定される。ブッシング22は、導体23の周囲に絶縁層24
を形成した単一形ブッシングであるが、嵌合される絶縁
層10との界面には、例えばシリコーン、ゴム等の緩衝層
25を設け密着されている。また接地側は、電界緩和のた
め接地層26が設けられ、接地層26の端部26ａは一定の曲
率を持たせている。更に、ブッシング22の接地側におい
ては、ガス管15は細径であるが、ブッシング相互20，22
の接続部においては太径となって伸縮部27が設けられて
いる。なお、絶縁ブッシング７は三相配置されるが、ガ
ス管15の伸縮部27は、図２に示すように、互いをずらし
た三角配置される。このため、太径の伸縮部27が横一列
とならないように、ブッシング20，22の長さは２種類と
している。Here, on the gas pipe 15 side, a bushing in which one is provided with a contact 13 for connecting with the conductor 9 and the other is provided with a contact 21 for connecting with a bushing 20 from an adjacent board.
22 is fixed to the insulating layer 10 via the O-ring 16 between the gas pipe 15 and the gas pipe 15. The bushing 22 includes an insulating layer 24 around the conductor 23.
Although it is a single type bushing in which a cushioning layer such as silicone or rubber is formed at the interface with the insulating layer 10 to be fitted.
Tightly provided with 25. On the ground side, a ground layer 26 is provided to relax the electric field, and an end portion 26a of the ground layer 26 has a constant curvature. Further, on the ground side of the bushing 22, although the gas pipe 15 has a small diameter,
The connecting portion has a large diameter and is provided with a stretchable portion 27. Note that the insulating bushings 7 are arranged in three phases, but the expansion / contraction parts 27 of the gas pipe 15 are arranged in a triangular shape in which they are offset from each other, as shown in FIG. For this reason, the bushings 20 and 22 have two types of lengths so that the large-diameter stretchable portions 27 are not arranged in a line.

【００１５】これらの構成において、絶縁ブッシング７
と嵌合されるブッシング22は緩衝層25で密着されてお
り、ボイド等の形成がされず、良好な絶縁特性を維持す
ることができる。また接地側は、接地層26の形成により
電界緩和が施されているので、接地となるガス管15は更
に細径化が可能となり、絶縁層10との取付け固定のスペ
ースを縮小することができる。一方、ブッシング相互2
0，22の接続部においては、ガス管15が太径の伸縮部27
であるため、充分なガスギャップを保つことができ、良
好な絶縁特性を保つことができる。なお、必要に応じて
接触子21等に電界緩和を施せば、伸縮部27の直径を縮小
することができる。In these configurations, the insulating bushing 7
Since the bushing 22 fitted with is closely adhered by the buffer layer 25, voids and the like are not formed, and good insulation characteristics can be maintained. Further, on the ground side, since the electric field is relaxed by forming the ground layer 26, the diameter of the gas pipe 15 serving as the ground can be further reduced, and the space for mounting and fixing the insulating layer 10 can be reduced. . Meanwhile, bushing mutual 2
At the connecting portion of 0 and 22, the gas pipe 15 has a large diameter expandable portion 27.
Therefore, a sufficient gas gap can be maintained, and good insulation characteristics can be maintained. It should be noted that the diameter of the stretchable portion 27 can be reduced by subjecting the contactor 21 and the like to electric field relaxation as necessary.

【００１６】また、ガス管15の三相配置においては、伸
縮部17の配置を横方向にづらしているため、最小のスペ
ースとなる。なお、図３に示すように絶縁ブッシング７
の高さを変化させて、三相分を縦方向で配置すると、伸
縮部27の位置を三相分共同様にしても盤幅方向が最小の
スペースにすることが可能である。Further, in the three-phase arrangement of the gas pipe 15, since the arrangement of the expansion and contraction portion 17 is laterally staggered, the space becomes the minimum. In addition, as shown in FIG.
By arranging the heights of the three phases in the vertical direction by changing the height, it is possible to make the space in the board width direction the smallest even if the positions of the expansion / contraction parts 27 are the same for the three phases.

【００１７】次に、図４にガス絶縁母線側の接続導体28
をより線より成る導体29と周囲にポリエチレン樹脂より
成る絶縁層30を形成した構成を示す。ここで、この接続
導体28は、例えばより線のＣＶケーブルの接地層を取除
いた構造でよい。Next, FIG. 4 shows the connecting conductor 28 on the gas-insulated bus bar side.
1 shows a structure in which a conductor 29 made of a twisted wire and an insulating layer 30 made of polyethylene resin are formed around the conductor 29. Here, the connecting conductor 28 may have a structure in which the ground layer of the stranded CV cable is removed, for example.

【００１８】この接続導体28の周囲には、例えばＥＰゴ
ムを成形した絶縁層31が形成され、一方は機器側の絶縁
層10と密着されている。また、他方は円錐状に突出して
おり、接続導体28と絶縁層31との接合部における電界の
乱れを防いでいる。なお絶縁層間10−31，30−31には、
シリコーングリスが塗布され、密着されている。接地側
においては、電界緩和用のＬ字形の半導電層32が絶縁層
31に埋込まれており、ガス管33と共にＯリング16を介し
てボルト17で絶縁層10に固定されている。ガス管33には
伸縮部33ａを設けており、内部には絶縁ガス18が封入さ
れている。An insulating layer 31 formed of, for example, EP rubber is formed around the connecting conductor 28, and one of them is in close contact with the insulating layer 10 on the device side. Further, the other protrudes in a conical shape and prevents disturbance of the electric field at the joint between the connecting conductor 28 and the insulating layer 31. In addition, between the insulating layers 10-31, 30-31,
Silicone grease is applied and adhered. On the ground side, the L-shaped semiconductive layer 32 for relaxing the electric field is an insulating layer.
It is embedded in 31 and is fixed to the insulating layer 10 by a bolt 17 together with the gas pipe 33 via an O-ring 16. The gas pipe 33 is provided with a stretchable portion 33a, and the insulating gas 18 is enclosed inside.

【００１９】これらの構成において、絶縁層10−31，30
−31は密着されているため、界面にボイド等が形成され
ず良好な絶縁特性を維持することができる。従って、ガ
ス母線の接続部の縮小化が図れる。また、ガス側におい
ては、ゴム等より成る絶縁層31が緩やかに立上っている
ので、電界の分布を乱すことが少なく、更に誘電率を例
えば約2.6 としているので、電界強度を極端に上昇させ
ることがなく縮小化が図れる。接地側においては、半導
電層32が埋込まれて接地電位と接続されているので、接
地側の電界緩和が図れ、安定した絶縁特性を維持するこ
とができる。In these structures, the insulating layers 10-31, 30
Since -31 is in close contact, voids and the like are not formed at the interface, and good insulation characteristics can be maintained. Therefore, the connection portion of the gas bus bar can be downsized. On the gas side, since the insulating layer 31 made of rubber or the like rises gently, it does not disturb the distribution of the electric field, and since the dielectric constant is, for example, about 2.6, the electric field strength rises extremely. It is possible to reduce the size without doing this. On the ground side, the semiconductive layer 32 is buried and connected to the ground potential, so that the electric field on the ground side can be relaxed and stable insulation characteristics can be maintained.

【００２０】これらのことより、金属露出部がないガス
母線とすることができるので、破壊電圧に及ぼす一つの
因子である電極表面からの電子放出を抑制し、耐電圧を
向上させることができる。従って、全体形状の縮小化が
図れる。From the above, a gas bus bar having no metal exposed portion can be obtained, so that electron emission from the electrode surface, which is one factor affecting the breakdown voltage, can be suppressed and the withstand voltage can be improved. Therefore, the overall shape can be reduced.

【００２１】なお、接続導体28とガス管33は、伸縮部を
有しているので、温度上昇等における寸法の変化を吸収
することができる。次に、絶縁ガスを主絶縁媒体とする
ガス絶縁母線の構造を図５に示す。略Ｔ形の導体９に
は、周囲に絶縁層34が形成され、フレーム11に固定され
ているが、ガス絶縁母線側では接続導体35が接続される
部分に開口部が形成されるように絶縁層34ａが形成され
ている。またガス管36は、Ｏリング16を介してボルト17
でフレーム11に固定されており、略Ｔ字形の導体９等の
気中側を覆い、絶縁ガス18が封入されている。ガス管36
には、伸縮部36ａと直線部36ｂがそれぞれ密封されて固
定されている。なお、接続導体35の端部には、接触子37
が取付けられ導体９との接続がされている。Since the connecting conductor 28 and the gas pipe 33 have the expanding / contracting portion, it is possible to absorb the dimensional change due to temperature rise and the like. Next, FIG. 5 shows the structure of a gas-insulated bus bar using an insulating gas as a main insulating medium. An insulating layer 34 is formed around the substantially T-shaped conductor 9 and is fixed to the frame 11. However, insulation is formed so that an opening is formed in a portion to which the connecting conductor 35 is connected on the gas insulating busbar side. The layer 34a is formed. Further, the gas pipe 36 is connected to the bolt 17 via the O-ring 16.
Is fixed to the frame 11 and covers the air side of the substantially T-shaped conductor 9 and the like, and the insulating gas 18 is filled therein. Gas pipe 36
The expansion / contraction part 36a and the linear part 36b are hermetically fixed to each other. Note that the contact 37 is provided at the end of the connecting conductor 35.
Is attached and is connected to the conductor 9.

【００２２】このように構成されたガス母線では、図示
下方の機器側ブッシングの形状を変えることなく、耐電
圧特性の向上が図れる。つまり、ガス絶縁母線側のガス
ギャップを充分に確保することができるので、高電圧化
や大容量化が容易となる。また、接続導体35の接続部で
は、形状が複雑でそれに伴って電界強度で上昇しやすい
が、電極部が絶縁層34ａで覆われているので、破壊電圧
に及ぼす因子の電子放出が抑制され耐電圧を向上させる
ことができる。従って、接続部囲りの縮小化が図れる。
なお、接続導体35部では、同軸円筒形状で比較的に電界
強度が上昇しないので縮小化が図れる。With the gas bus thus constructed, the withstand voltage characteristics can be improved without changing the shape of the bushing on the equipment side below the drawing. That is, since the gas gap on the gas insulating busbar side can be sufficiently secured, it becomes easy to increase the voltage and the capacity. Further, in the connection portion of the connection conductor 35, the shape is complicated and the electric field strength is likely to increase accordingly, but since the electrode portion is covered with the insulating layer 34a, electron emission which is a factor affecting the breakdown voltage is suppressed. The voltage can be improved. Therefore, it is possible to reduce the size of the surrounding area of the connection portion.
The connecting conductor 35 has a coaxial cylindrical shape, and the electric field strength does not increase relatively, so that the size can be reduced.

【００２３】[0023]

【発明の効果】以上のように本発明によれば、箱体の夫
々のブッシング間に配設された中心導体の一端を適切に
一方のブッシングに接合し、中心導体を包囲するガス管
に伸縮部を形成させてガスギャップを十分に確保するこ
とができるので、導体接続部の電解強度を抑制して縮小
化が図れるガス絶縁母線を得ることができる。As described above, according to the present invention, one end of the central conductor disposed between the bushings of the box body is appropriately joined to one of the bushings, and the gas pipe surrounding the central conductor is expanded and contracted. Since the gas gap can be sufficiently secured by forming the portion, it is possible to obtain the gas-insulated busbar which can suppress the electrolytic strength of the conductor connecting portion and can be reduced in size.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明のガス絶縁母線の第１の実施例を示す断
面図。FIG. 1 is a sectional view showing a first embodiment of a gas-insulated bus bar of the present invention.

【図２】［図１］のガス管15の伸縮部27の配置を説明す
るための第１の図。FIG. 2 is a first diagram for explaining the arrangement of the expandable portion 27 of the gas pipe 15 of FIG.

【図３】［図１］のガス管15の伸縮部27の配置を説明す
るための第２の図。FIG. 3 is a second diagram for explaining the arrangement of the expansion / contraction part 27 of the gas pipe 15 of FIG.

【図４】本発明のガス絶縁母線の第２の実施例を示す断
面図。FIG. 4 is a sectional view showing a second embodiment of the gas insulated bus bar of the present invention.

【図５】本発明のガス絶縁母線の第２の実施例を示す断
面図。FIG. 5 is a sectional view showing a second embodiment of the gas insulated bus bar of the present invention.

【図６】代表的なガス絶縁開閉装置の側面図。FIG. 6 is a side view of a typical gas insulated switchgear.

【図７】従来のガス絶縁母線の断面図。FIG. 7 is a sectional view of a conventional gas-insulated bus bar.

【符号の説明】[Explanation of symbols]

７…絶縁ブッシング、15…ガス管、20…ブッシング、23
…導体、24…絶縁層、25…緩衝層、26…接地層、27…伸
縮部7 ... Insulating bushing, 15 ... Gas pipe, 20 ... Bushing, 23
... conductor, 24 ... insulating layer, 25 ... buffer layer, 26 ... ground layer, 27 ... expansion / contraction part

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 内部に絶縁ガスが封入され電気機器が収
納された箱体間を、この箱体の夫々の外壁に設けられた
ブッシングを介して接続するガス絶縁母線において、前
記ブッシング間に配設され周囲に絶縁層を形成した中心
導体と、この中心導体の一方のブッシング側表面に形成
され、このブッシングの絶縁層と中心導体を接着させる
緩衝層と、伸縮部を有すると共に、前記絶縁層が形成さ
れた中心導体を包囲するように設けられガス管とを備
え、ガス管の他方のブッシング側の径を前記一方のブッ
シング側の径よりも大きくして前記中心導体と他方のブ
ッシングを接続したことを特徴とするガス絶縁母線。1. A gas-insulated bus bar that connects between boxes in which an insulating gas is enclosed and electric equipment is housed via bushings provided on the outer walls of the boxes. A central conductor provided with an insulating layer on the periphery thereof, a buffer layer formed on one surface of the central conductor on the side of the bushing for adhering the insulating layer of the bushing to the central conductor, and an expandable portion, and the insulating layer And a gas pipe provided so as to surround the formed central conductor, and the diameter of the other bushing side of the gas pipe is made larger than the diameter of the one bushing side to connect the central conductor and the other bushing. The gas-insulated bus bar characterized in that 【請求項２】 前記中心導体の接地側となる絶縁層に、
中心導体と同軸円筒状で端部に湾曲部を有する接地層を
形成させたことを特徴とする請求項１記載のガス絶縁母
線。2. The insulating layer on the ground side of the center conductor,
The gas-insulated bus bar according to claim 1, wherein a ground layer having a cylindrical shape coaxial with the central conductor and having a curved portion at an end is formed. 【請求項３】 内部に絶縁ガスが封入され電気機器が収
納された箱体間を、この箱体の夫々の外壁に設けられた
ブッシングを介して接続するガス絶縁母線において、前
記ブッシング間に配設され周囲に第１の絶縁層を形成し
た中心導体と、一方のブッシング側に前記第１の絶縁層
が形成された中心導体を包囲するように形成され、一端
が前記一方のブッシング側の絶縁層に接着し、他端が前
記第１の絶縁層に接着する円錐状の第２の絶縁層と、伸
縮部を有すると共に、前記第２の絶縁層が形成された中
心導体を包囲するように設けられたガス管とを有するガ
ス絶縁母線。3. A gas-insulated bus bar that connects between boxes in which an insulating gas is enclosed and electric equipment is housed via bushings provided on the outer walls of the boxes, respectively. Is provided so as to surround the central conductor having the first insulating layer formed on the periphery thereof and the central conductor having the first insulating layer formed on one bushing side, and one end of which is insulated on the one bushing side. A second insulating layer having a conical shape that adheres to the layer and the other end adheres to the first insulating layer, and has a stretchable portion and surrounds the central conductor on which the second insulating layer is formed. A gas-insulated bus bar having a gas pipe provided. 【請求項４】 前記中心導体の接地側となる第２の絶縁
層に、略Ｌ字状の半導電層を埋設させたことを特徴とす
る請求項３記載のガス絶縁母線。4. The gas-insulated bus bar according to claim 3, wherein a substantially L-shaped semiconductive layer is embedded in the second insulating layer on the ground side of the center conductor. 【請求項５】 内部に絶縁ガスが封入され電気機器が収
納された箱体間を、この箱体の夫々の外壁に設けられた
ブッシングを介して接続するガス絶縁母線において、前
記ブッシング間に配設され、一方のブッシングに接続さ
れる中心導体と、伸縮部を有すると共に、前記中心導体
およびブッシングを包囲するように設けられたガス管と
を有するガス絶縁母線。5. A gas-insulated bus bar that connects between boxes in which an insulating gas is enclosed and electric equipment is housed through bushings provided on the outer walls of the boxes, respectively. A gas-insulated bus bar provided with a central conductor that is connected to one of the bushings, and a gas pipe that has a stretchable portion and that is provided so as to surround the central conductor and the bushing.