JP2000113782A - Puffer gas circuit breaker - Google Patents
Puffer gas circuit breakerInfo
- Publication number
- JP2000113782A JP2000113782A JP10279956A JP27995698A JP2000113782A JP 2000113782 A JP2000113782 A JP 2000113782A JP 10279956 A JP10279956 A JP 10279956A JP 27995698 A JP27995698 A JP 27995698A JP 2000113782 A JP2000113782 A JP 2000113782A
- Authority
- JP
- Japan
- Prior art keywords
- fixed
- contact
- puffer
- movable
- arc contact
- 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
- Circuit Breakers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、消弧性ガスとし
てＳＦ6 ガスが用いられている電力用のガス遮断器、特
に、小形化することのできる遮断器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas circuit breaker for electric power using SF 6 gas as an arc-extinguishing gas, and more particularly to a circuit breaker that can be downsized.
【０００２】[0002]
【従来の技術】パッファ形ガス遮断器は、消弧性ガスを
圧縮し、この圧縮ガスをアーク接点の開離間隙に吹き付
けてアークを吹き消し通電電流を遮断するものである。
この遮断器の消弧性ガスとしては、ＳＦ6 ガスが非常に
優れており、中小容量から大容量の遮断器にまで広く用
いられている。2. Description of the Related Art A puffer-type gas circuit breaker compresses an arc-extinguishing gas and blows the compressed gas to an opening gap of an arc contact to blow out an arc and cut off an electric current.
As the arc-extinguishing gas for this circuit breaker, SF 6 gas is very excellent, and is widely used for medium to small capacity to large capacity circuit breakers.
【０００３】図５は、従来のパッファ形ガス遮断器の構
成を示す要部断面図であり、遮断動作している途中の状
態が示されている。ＳＦ6 ガスで充填された密閉タンク
６内に、棒状導体よりなる固定アーク接点１１と、内腔
１３Ａを備えた可動アーク接点１３とで一対の互いに接
離可能なアーク接点が形成されている。可動アーク接点
１３は、図５の上下方向に移動可能である。一方、固定
アーク接点１１、可動アーク接点１３とそれぞれ導通す
る固定通電接点１０、可動通電接点１４が一対の通電接
点を形成している。固定通電接点１０は固定アーク接点
１１の周囲を囲むようにして設けられ、可動通電接点１
４は可動アーク接点１３の周囲を囲み可動アーク接点１
３とともに図５の上下方向に移動可能である。パッファ
形ガス遮断器の通電時は、可動通電接点１４が図５の上
方へ移動して固定通電接点１０の内部に挿入されて可動
通電接点１４と固定通電接点１０とが接触し合うととも
に、可動アーク接点１３の内腔１３Ａに固定アーク接点
１１が挿入されて可動アーク接点１３と固定アーク接点
１１とが接触し合うことによって通電状態が保たれてい
る。図５では、パッファ形ガス遮断器の上下の構成の図
示が省略されているが、固定通電接点１０および固定ア
ーク接点１１に接続された図示されていない主回路導体
が上方へ伸び、一方、可動通電接点１４および可動アー
ク接点１３に接続された図示されていないもう一方の主
回路導体が下方へ伸び、電力回路の開閉が行われる。FIG. 5 is a cross-sectional view of a main part showing a configuration of a conventional puffer type gas circuit breaker, showing a state in the middle of a breaking operation. In the closed tank 6 filled with SF 6 gas, a fixed arc contact 11 made of a rod-shaped conductor and a movable arc contact 13 having an inner cavity 13A form a pair of mutually contactable arc contacts. The movable arc contact 13 is vertically movable in FIG. On the other hand, the fixed energizing contact 10 and the movable energizing contact 14 that respectively conduct with the fixed arc contact 11 and the movable arc contact 13 form a pair of energizing contacts. The fixed energizing contact 10 is provided so as to surround the periphery of the fixed arc contact 11,
4 is a movable arc contact 1 surrounding the movable arc contact 13.
3 can be moved up and down in FIG. When the puffer type gas circuit breaker is energized, the movable energizing contact 14 moves upward in FIG. 5 and is inserted into the fixed energizing contact 10 so that the movable energizing contact 14 and the fixed energizing contact 10 come into contact with each other. When the fixed arc contact 11 is inserted into the bore 13A of the arc contact 13 and the movable arc contact 13 and the fixed arc contact 11 come into contact with each other, the energized state is maintained. In FIG. 5, the upper and lower configurations of the puffer type gas circuit breaker are not shown, but the main circuit conductors (not shown) connected to the fixed current-carrying contacts 10 and the fixed arc contacts 11 extend upward, while The other main circuit conductor (not shown) connected to the current-carrying contact 14 and the movable arc contact 13 extends downward to open and close the power circuit.
【０００４】また、図５において、遮断動作時には、可
動通電接点１４が下降し、固定通電接点１０と可動通電
接点１４とが開離した後で固定アーク接点１１と可動ア
ーク接点１３が開離するように構成されている。すなわ
ち、固定通電接点１０と可動通電接点１４が開離したと
きに、固定アーク接点１１と可動アーク接点１３との開
離間隙１８だけにアークが移るようになっている。それ
によって、固定通電接点１０と可動通電接点１４とがア
ークによって損傷されることを防いでいる。遮断時に発
生するアークを固定アーク接点１１と可動アーク接点１
３との開離間隙１８だけに閉じ込め、このアークに後述
される圧縮ガスを吹き付けて消弧がなされる。パッファ
形とは、ｐｕｆｆの「吹き出す」の意から由来してお
り、圧縮された消弧性ガスをアークに吹き付けることに
よって大電流を遮断することから来ている。遮断終了後
は、可動通電接点１４が図５の構成よりさらに下へ移動
し、固定通電接点１１からさらに離れた位置まで下降す
る。[0005] In FIG. 5, at the time of the breaking operation, the movable energizing contact 14 is lowered, and after the fixed energizing contact 10 and the movable energizing contact 14 are separated, the fixed arc contact 11 and the movable arc contact 13 are separated. It is configured as follows. That is, when the fixed energizing contact 10 and the movable energizing contact 14 are separated, the arc is transferred only to the separation gap 18 between the fixed arc contact 11 and the movable arc contact 13. This prevents the fixed energizing contact 10 and the movable energizing contact 14 from being damaged by the arc. The arc generated at the time of interruption is defined as a fixed arc contact 11 and a movable arc contact 1.
3, and the arc is extinguished by blowing a compressed gas described later on the arc. The puffer shape derives from the meaning of “blow” of puff, which is to cut off a large current by blowing a compressed arc-extinguishing gas to the arc. After the cutoff, the movable energizing contact 14 moves further below the configuration of FIG. 5 and descends to a position further away from the fixed energizing contact 11.
【０００５】さらに、図５において、金属シールド７，
９は、それぞれ固定通電接点１０，可動通電接点１４の
外周を包囲し、密閉タンク６との間に発生する電界集中
を緩和させている。金属シールド７，９はいずれも固定
されたものであり、それぞれ金属シールド７は固定通電
接点１０側に固定され、金属シールド９は固定ピストン
１７側に固定されている。この金属シールド７，９に絶
縁筒８が接着されている。絶縁筒８はガラス繊維強化プ
ラスチックよりなり、アークの加熱によって発生した分
解ガスを絶縁筒８内に閉じ込め、密閉タンク６に対する
絶縁が低下するのを防いでいる。また、図５の下部に図
示されていない駆動装置が連結されていて、可動通電接
点１４および可動アーク接点１３をパッファシリンダ１
５および排気筒１７とともに上下駆動させる。一方、固
定ピストン１６は固定されたものであり、パッファシリ
ンダ１５内部と排気筒１７との間にパッファ室１５Ａを
形成している。このパッファ室１５Ａは、遮断時にパッ
ファシリンダ１５が下方に移動することによって、パッ
ファ室１５Ａ内のガスが圧縮される。この圧縮ガスが、
パッファシリンダ１５の上部に形成された吹出し穴１５
Ｂから開離間隙１８へ吹き出すようになっている。[0005] Further, in FIG.
9 surrounds the outer circumferences of the fixed energizing contact 10 and the movable energizing contact 14, respectively, and alleviates the electric field concentration generated between the stationary energizing contact 10 and the closed energizing tank 6. Each of the metal shields 7 and 9 is fixed. The metal shield 7 is fixed to the fixed energizing contact 10 side, and the metal shield 9 is fixed to the fixed piston 17 side. An insulating cylinder 8 is bonded to the metal shields 7 and 9. The insulating cylinder 8 is made of glass fiber reinforced plastic and traps decomposition gas generated by the heating of the arc in the insulating cylinder 8 to prevent the insulation of the closed tank 6 from lowering. A driving device (not shown) is connected to the lower part of FIG. 5 to move the movable energizing contact 14 and the movable arc contact 13 to the puffer cylinder 1.
5 and the exhaust pipe 17 are driven up and down. On the other hand, the fixed piston 16 is fixed, and forms a puffer chamber 15 </ b> A between the inside of the puffer cylinder 15 and the exhaust pipe 17. In the puffer chamber 15A, the gas in the puffer chamber 15A is compressed by moving the puffer cylinder 15 downward when shut off. This compressed gas is
Blow-out hole 15 formed in the upper part of puffer cylinder 15
B is blown out to the separation gap 18.
【０００６】図６は、図５の要部拡大断面図である。可
動通電接点１４と可動アーク接点１３との間に、第一絶
縁ノズル１２Ａと第二絶縁ノズル１２Ｂとが配され、そ
の間に通気ガイド１９が形成されている。第一絶縁ノズ
ル１２Ａは、中空の絶縁体よりなるとともに上方の開口
部は絞られて固定アーク接点１１の出入りするノズル穴
１２が形成され、下部の開口側からはパッファシリンダ
１５の吹出し穴１５Ｂからパッファ室１５Ａ内の圧縮ガ
スを導き入れ、この圧縮ガスを通気ガイド１９中を矢印
１９Ａのように通過させて開離間隙１８に導く。一方、
第二絶縁ノズル１２Ｂは、可動アーク接点１３の外壁側
を覆うようにして配されている。遮断時に、固定アーク
接点１１と可動アーク接点１４との間にアークが発生す
るが、通気ガイド１９からの圧縮ガスによってアークが
冷却され、固定アーク接点１１が第一絶縁ノズル１２Ａ
のノズル穴１２から抜け出た後に消弧される。なお、固
定アーク接点１０の内壁に設けられた周回突起１０Ａ
は、可動アーク接点１４が上昇したときに可動アーク接
点１４の外周面と固定アーク接点１０の周回突起１０Ａ
とが接触するようにさせるためのものである。FIG. 6 is an enlarged sectional view of a main part of FIG. A first insulating nozzle 12A and a second insulating nozzle 12B are arranged between the movable energizing contact 14 and the movable arc contact 13, and a ventilation guide 19 is formed therebetween. The first insulating nozzle 12A is made of a hollow insulator and the upper opening is narrowed to form a nozzle hole 12 for the fixed arc contact 11 to enter and exit, and from the lower opening side to the outlet hole 15B of the puffer cylinder 15 The compressed gas in the puffer chamber 15A is introduced, and the compressed gas is passed through the ventilation guide 19 as indicated by an arrow 19A and guided to the separation gap 18. on the other hand,
The second insulating nozzle 12B is disposed so as to cover the outer wall side of the movable arc contact 13. At the time of interruption, an arc is generated between the fixed arc contact 11 and the movable arc contact 14, but the arc is cooled by the compressed gas from the ventilation guide 19, and the fixed arc contact 11 becomes the first insulating nozzle 12A.
The arc is extinguished after exiting from the nozzle hole 12. The circular projection 10A provided on the inner wall of the fixed arc contact 10
When the movable arc contact 14 rises, the outer peripheral surface of the movable arc contact 14 and the orbiting projection 10A of the fixed arc contact 10
Is to make contact with.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前述し
たような従来の装置は、絶縁筒にかかる電界が高いとい
う問題があった。図７は、図５における電位分布図であ
り、可動アーク接点１３に１００％の電位が、固定アー
ク接点１１に０％の電位が与えられ、有限要素法にて軸
対称場（中心軸２１）として電界計算された結果であ
る。電界計算は、密閉タンクの内部全体について行わ
れ、固定アーク接点１１と可動アーク接点１３との間の
開離間隙近傍の電位分布を拡大して示したのが図７であ
る。計算された等電位線２０は９．０９％の等ピッチで
引かれた線である。However, the conventional device as described above has a problem that the electric field applied to the insulating cylinder is high. FIG. 7 is a potential distribution diagram in FIG. 5, in which 100% potential is applied to the movable arc contact 13 and 0% potential is applied to the fixed arc contact 11, and an axially symmetric field (central axis 21) is obtained by the finite element method. Is the result of the electric field calculation. The electric field calculation is performed for the entire inside of the closed tank, and FIG. 7 is an enlarged view of the potential distribution near the separation gap between the fixed arc contact 11 and the movable arc contact 13. The calculated equipotential line 20 is a line drawn at an equal pitch of 9.09%.
【０００８】図８は、図７の絶縁筒８周辺の拡大電位分
布図であり、図７の電位分布を基にして、絶縁筒８の周
辺がさらに詳細に電界計算されて得られた結果である。
等電位線２０Ａは等ピッチで引かれた線である。絶縁筒
８の沿面方向にかかる電界のうち、金属シールド７近辺
の電界をＥ1 、金属シールド７から離れた部分の電界を
Ｅ2 とする。図８の絶縁筒８の沿面における等電位線２
０Ａ同士の間隙は、金属シールド７から離れた部分より
金属シールド７近辺の方が広くなっている。そのため
に、Ｅ1 ＜Ｅ2 となり、絶縁筒８の中間部に高い電界が
かかっている。絶縁筒８の沿面部に高い電界がかかる
と、交流の耐電圧試験や落雷、回路の開閉などによって
遮断器に侵入して来る高電圧に絶縁筒８の沿面部の絶縁
が耐えられなくなる恐れある。したがって、従来は、絶
縁筒８の長さや密閉タンクとの離隔距離をこれ以上縮め
るとができなかった。そのために、遮断器もこれ以上小
形化することができなかった。FIG. 8 is an enlarged potential distribution diagram around the insulating cylinder 8 shown in FIG. 7. FIG. 8 shows a result obtained by performing more detailed electric field calculation around the insulating cylinder 8 based on the potential distribution shown in FIG. is there.
The equipotential lines 20A are lines drawn at an equal pitch. Of the electric field applied in the creeping direction of the insulating cylinder 8, the electric field near the metal shield 7 is E 1 , and the electric field at a portion away from the metal shield 7 is E 2 . Equipotential line 2 on the surface of the insulating cylinder 8 in FIG.
The gap between 0A is wider near the metal shield 7 than at a portion away from the metal shield 7. Therefore, E 1 <E 2 , and a high electric field is applied to the middle part of the insulating cylinder 8. When a high electric field is applied to the creepage portion of the insulating cylinder 8, the insulation of the creepage portion of the insulating cylinder 8 may not be able to withstand a high voltage that enters the circuit breaker due to an AC withstand voltage test, lightning strike, circuit opening / closing, and the like. . Therefore, conventionally, it has not been possible to further reduce the length of the insulating tube 8 or the distance from the closed tank. Therefore, the circuit breaker could not be further reduced in size.
【０００９】この発明の目的は、絶縁筒表面の電界を緩
和させることにある。An object of the present invention is to alleviate an electric field on the surface of an insulating cylinder.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、この発明によれば、消弧性ガスで充填された密閉タ
ンク内に、棒状導体よりなる固定アーク接点と、この固
定アーク接点の軸方向に移動可能であり固定アーク接点
と接離する可動アーク接点と、この可動アーク接点の反
固定アーク接点側に取り付けられ内部にパッファ室を形
成するパッファシリンダと、パッファ室内に配されパッ
ファシリンダが反固定アーク接点側へ移動するとともに
パッファ室内の消弧性ガスを圧縮する固定ピストンと、
固定アーク接点の外周を囲むとともに固定アーク接点と
導通する固定通電接点と、可動アーク接点の外周を囲
み、可動アーク接点と導通するとともに固定通電接点と
接離する可動通電接点と、この可動通電接点および固定
通電接点の外周を囲むとともに可動通電接点の移動方向
に中心軸が向けられて配された絶縁筒と、この絶縁筒の
軸方向の両端部に取り付けられそれぞれが固定通電接点
側、固定ピストン側に固定された一対の金属シールドと
により構成され、遮断動作時に固定通電接点と可動通電
接点とが開離した後で固定アーク接点と可動アーク接点
とが開離し、固定アーク接点と可動アーク接点との開離
間隙に生ずるアークがパッファシリンダからの圧縮ガス
で吹き消されてなるパッファ形ガス遮断器において、前
記絶縁筒が軸方向に繋がる３つの絶縁筒部からなり、両
側の絶縁筒部がそれぞれ金属シールドに固定されるとと
もに中間の絶縁筒部が金属シールドの端部から軸方向に
離れた位置で両側の絶縁筒部に接合され、両側の絶縁筒
部の比誘電率が中間の絶縁筒部のそれより小さくなるよ
うにするとよい。それによって中間の絶縁筒部のキャパ
シタンスが両側の絶縁筒部のそれより大きくなるので、
絶縁筒にかかる電界が緩和される。According to the present invention, there is provided, in accordance with the present invention, a fixed arc contact made of a rod-like conductor and a fixed arc contact made of the rod-shaped conductor in a closed tank filled with an arc-extinguishing gas. A movable arc contact which is movable in the axial direction and comes into contact with and separates from the fixed arc contact; a puffer cylinder which is mounted on the opposite fixed arc contact side of the movable arc contact to form a puffer chamber therein; and a puffer cylinder which is disposed in the puffer chamber A stationary piston that moves to the anti-fixed arc contact side and compresses the arc-extinguishing gas in the puffer chamber;
A fixed energizing contact that surrounds the outer periphery of the fixed arc contact and conducts with the fixed arc contact; a movable energizing contact that surrounds the outer periphery of the movable arc contact and conducts with the movable arc contact and contacts and separates from the fixed energizing contact; And an insulating cylinder surrounding the outer periphery of the fixed energizing contact and having a central axis oriented in the moving direction of the movable energizing contact, and fixed energizing contact sides, fixed pistons respectively attached to both axial ends of the insulating cylinder. The fixed arc contact and the movable arc contact are separated after the fixed energizing contact and the movable energizing contact are separated during the breaking operation, and the fixed arc contact and the movable arc contact are separated. In the puffer type gas circuit breaker, in which the arc generated in the separation gap with the puffer cylinder is blown out by the compressed gas from the puffer cylinder, It consists of three insulated cylinders, and the two insulated cylinders are fixed to the metal shield respectively, and the middle insulated cylinder is joined to the two insulated cylinders at a position axially away from the end of the metal shield. It is preferable that the relative dielectric constant of the insulating cylinder portions on both sides be smaller than that of the intermediate insulating cylinder portion. As a result, the capacitance of the middle insulating cylinder becomes larger than that of the insulating cylinder on both sides,
The electric field applied to the insulating cylinder is reduced.
【００１１】また、かかる構成において、両側の絶縁筒
部がポリテトラフルオルエチレンよりなるとともに、中
間の絶縁筒部がガラス繊維強化プラスチックよりなるよ
うにしてもよい。ポリテトラフルオルエチレンの比誘電
率が２、ガラス繊維強化プラスチックの比誘電率が５な
ので、絶縁筒にかかる電界が緩和される。また、かかる
構成において、両側の絶縁筒部と中間の絶縁筒部との接
合部が切欠き部の嵌め合い構造によって接合されるよう
にしてもよい。それによって、絶縁筒が機械的に丈夫に
なる。In such a configuration, the insulating tubular portions on both sides may be made of polytetrafluoroethylene, and the intermediate insulating tubular portion may be made of glass fiber reinforced plastic. Since the relative permittivity of polytetrafluoroethylene is 2 and the relative permittivity of glass fiber reinforced plastic is 5, the electric field applied to the insulating cylinder is reduced. Further, in such a configuration, the joint portion between the insulating tubular portions on both sides and the intermediate insulating tubular portion may be joined by a notch fitting structure. Thereby, the insulating tube becomes mechanically strong.
【００１２】また、かかる構成において、両側の絶縁筒
部と中間の絶縁筒部との接合部が両ねじの嵌め合い構造
によって接合されるようにしてもよい。それによって
も、絶縁筒が機械的に丈夫になる。In this configuration, the joint between the insulating tubular portion on both sides and the intermediate insulating tubular portion may be joined by a fitting structure of both screws. This also makes the insulation tube mechanically robust.
【００１３】[0013]
【発明の実施の形態】以下、この発明を実施例に基づい
て説明する。図１は、この発明の実施例にかかるパッフ
ァ形ガス遮断器の構成を示す要部断面図である。絶縁筒
８０が軸方向に繋がる３つの絶縁筒部８０Ａ，８０Ｂ，
８０Ｃとから構成されている。両側の絶縁筒部８０Ａ，
８０Ｃがそれぞれ金属シールド７，９に固定され、中間
の絶縁筒部８０Ｂは金属シールド７，９の端部から軸方
向に離れた位置の接合部２３で両側の絶縁筒部８０Ａ，
８０Ｃに接合されている。両側の絶縁筒部８０Ａ，８０
Ｃはポリテトラフルオルエチレンにより形成されている
とともに、中間の絶縁筒部８０Ｂはガラス繊維強化プラ
スチックにより形成されている。ポリテトラフルオルエ
チレンの比誘電率は２であり、ガラス繊維強化プラスチ
ックの比誘電率は５なので、両側の絶縁筒部８０Ａ，８
０Ｃの比誘電率が中間の絶縁筒部８０Ｂのそれより小さ
くなっている。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a sectional view of a main part showing a configuration of a puffer type gas circuit breaker according to an embodiment of the present invention. Three insulating cylinder portions 80A, 80B, in which the insulating cylinder 80 is connected in the axial direction,
80C. 80A of insulating cylinder parts on both sides,
80C are fixed to the metal shields 7 and 9, respectively, and the intermediate insulating cylindrical portion 80B is a joint 23 at a position axially away from the ends of the metal shields 7 and 9 and the insulating cylindrical portions 80A and 80A on both sides.
80C. Insulating cylindrical portions 80A, 80 on both sides
C is formed of polytetrafluoroethylene, and the intermediate insulating cylinder 80B is formed of glass fiber reinforced plastic. Since the relative dielectric constant of polytetrafluoroethylene is 2, and the relative dielectric constant of glass fiber reinforced plastic is 5, the insulating cylinder portions 80A, 80 on both sides are used.
The relative dielectric constant of 0C is smaller than that of the middle insulating cylinder 80B.
【００１４】図２は、図１の要部拡大断面図である。両
側の絶縁筒部８０Ａと中間の絶縁筒部８０Ｂとの接合部
２３は、接着材にて気密に接合されている。図示されて
いないもう一つの下部の接合部２３も、同様に接着材に
て気密に接合されている。図１および図２のその他は、
それぞれ図５および図６の従来の構成と同じであり、従
来と同じ部分は同一参照符号を付けることによって詳細
な説明は省略する。FIG. 2 is an enlarged sectional view of a main part of FIG. The joint 23 between the insulating tubular portion 80A on both sides and the intermediate insulating tubular portion 80B is hermetically joined with an adhesive. The other lower joining portion 23 (not shown) is also hermetically joined with an adhesive. 1 and FIG. 2
5 and 6 are the same as those in the related art, and the same parts as in the related art are denoted by the same reference numerals, and the detailed description is omitted.
【００１５】図９は、図２の絶縁筒周辺の拡大電位分布
図であり、図８に対応する図である。図９の絶縁筒８０
Ａ，８０Ｂの沿面における等電位線２０Ａ同士の間隙
は、金属シールド７から離れた部分より金属シールド７
の近辺部分の方が僅かに狭くなっている。そのために、
金属シールド７近辺の電界Ｅ1 が金属シールド７から離
れた部分の電界Ｅ2 より僅かに高くなっている。そのた
めに、Ｅ1 ＞Ｅ2 となっているが、この実施例における
Ｅ1 の値は、図８の従来例におけるＥ2 の値より１０％
緩和されている。そのために、図１の構成は、絶縁筒の
長さや密閉タンクとの離隔距離を従来の場合より縮める
ことができ、遮断器全体も従来より小形化することがで
きるようになった。FIG. 9 is an enlarged potential distribution diagram around the insulating cylinder of FIG. 2 and corresponds to FIG. The insulating tube 80 of FIG.
The gap between the equipotential lines 20A on the surface of A, 80B is larger than the distance from the metal shield 7 to the metal shield 7A.
The area near is slightly narrower. for that reason,
The electric field E 1 in the vicinity of the metal shield 7 is slightly higher than the electric field E 2 in the part remote from the metal shield 7. For this reason, E 1 > E 2. However, the value of E 1 in this embodiment is 10% higher than the value of E 2 in the conventional example of FIG.
Has been relaxed. Therefore, in the configuration of FIG. 1, the length of the insulating cylinder and the separation distance from the closed tank can be reduced as compared with the conventional case, and the entire circuit breaker can be downsized as compared with the conventional case.
【００１６】図１０は、図１の実施例における絶縁筒沿
面の電界が緩和される理由を説明する等価回路図であ
る。金属シールド７，９間のキャパシタンスが、絶縁筒
部分とその他の部分とに分けて表されている。絶縁筒の
部分は絶縁筒部８０ＡのキャパシタンスＣ1 と、中間の
絶縁筒部８０ＢのキャパシタンスＣ2 と、絶縁筒部８０
ＣのキャパシタンスＣ3 との直列キャパシタンスで表さ
れ、絶縁筒以外の部分は、キャパシタンスＣ0 でもって
全て一括して表されている。絶縁筒部８０Ａにかかる電
圧Ｖ1 ，絶縁筒部８０Ｂにかかる電圧Ｖ2 ，絶縁筒部８
０Ｃにかかるに電圧Ｖ3 は、それぞれキャパシタンスＣ
1 とＣ2 とＣ3 との分圧でもってほぼ決まっている。し
たがって、キャパシタンスＣ1 ，Ｃ3 が小さくなる程、
両側の絶縁筒部８０Ａ，８０Ｃにかかる電圧Ｖ1 ，Ｖ3
が大きくなり、中間の絶縁筒部８０Ｂにかかる電圧Ｖ2
が小さくなる。絶縁筒部８０Ａおよび絶縁筒部８０Ｃの
比誘電率は２であり、従来の場合（比誘電率が５）と比
べて小さくなっているので、キャパシタンスＣ1 とＣ2
が従来より小さくなっている。そのために、絶縁筒部８
０Ｂにかかる電圧Ｖ2 が小さくなり、それに伴って、中
間の絶縁筒８０Ｂの沿面電界が従来より緩和される。FIG. 10 is an equivalent circuit diagram for explaining the reason why the electric field on the surface of the insulating cylinder is reduced in the embodiment of FIG. The capacitance between the metal shields 7 and 9 is shown separately for the insulating cylinder portion and other portions. Portion of the insulating tube and the capacitance C 1 of the insulating tube portion 80A, the capacitance C 2 of the intermediate insulating tubular portion 80B, the insulating cylinder portion 80
Represented by series capacitance of the capacitance C 3 and C, a portion other than the insulating cylinder is represented collectively all with a capacitance C 0. The voltage V 1 applied to the insulating tube 80A, the voltage V 2 applied to the insulating tube 80B, the insulating tube 8
The voltage V 3 applied to 0 C is the capacitance C
It is substantially determined with a partial pressure of 1 and C 2 and C 3. Therefore, as the capacitances C 1 and C 3 become smaller,
The voltages V 1 , V 3 applied to the insulating cylinder portions 80A, 80C on both sides
And the voltage V 2 applied to the intermediate insulating cylinder portion 80B
Becomes smaller. The dielectric constant of the insulation tube portion 80A and the insulating cylinder portion 80C is 2, since the conventional (relative dielectric constant 5) is smaller than the capacitance C 1 and C 2
Is smaller than before. For this purpose, the insulating cylinder 8
Voltage V 2 applied to the 0B is reduced, with it, the creeping electric field of an intermediate insulating tube 80B is relaxed than before.
【００１７】図３は、この発明の異なる実施例にかかる
パッファ形ガス遮断器の構成を示す要部断面図である。
絶縁筒８１が軸方向に繋がる３つの絶縁筒部８１Ａ，８
１Ｂ，８１Ｃとから構成され，両側の絶縁筒部８１Ａ，
８１Ｃはポリテトラフルオルエチレンより形成されてい
るとともに、中間の絶縁筒部８１Ｂはガラス繊維強化プ
ラスチックより形成されている。両側の絶縁筒部８１
Ａ，８１Ｃと中間の絶縁筒部８１Ｂとの接合部２５が切
欠き部の嵌め合い構造になっている。図３のその他は、
図１の構成と同じである。絶縁筒部８１Ａ，８１Ｃと絶
縁筒部８１Ｂとの端部が切り欠かれ、接着材を介して互
いに嵌め合わされている。この接合構成によって絶縁筒
８１が機械的に丈夫になる。なお、接合部２５における
切欠き部にねじ部を形成し、両ねじの嵌合によって接合
させる構造にしてもよい。FIG. 3 is a sectional view showing a main part of the configuration of a puffer type gas circuit breaker according to another embodiment of the present invention.
Three insulating cylinder portions 81A and 8 to which the insulating cylinder 81 is connected in the axial direction.
1B, 81C, and the insulating tubular portions 81A on both sides.
81C is made of polytetrafluoroethylene, and the middle insulating cylinder 81B is made of glass fiber reinforced plastic. Insulating cylinder part 81 on both sides
A joining portion 25 between A, 81C and the intermediate insulating tubular portion 81B has a notched portion fitting structure. The rest of FIG.
This is the same as the configuration in FIG. The ends of the insulating tubular portions 81A and 81C and the insulating tubular portion 81B are cut out and fitted to each other via an adhesive. This joining structure makes the insulating cylinder 81 mechanically strong. Note that a structure may be employed in which a screw portion is formed in the cutout portion of the joint portion 25 and the two screws are fitted to join.
【００１８】図４は、この発明のさらに異なる実施例に
かかるパッファ形ガス遮断器の構成を示す要部断面図で
ある。絶縁筒８２が軸方向に繋がる３つの絶縁筒部８２
Ａ，８２Ｂ，８２Ｃとから構成され，両側の絶縁筒部８
２Ａ，８２Ｃはポリテトラフルオルエチレンより形成さ
れているとともに、中間の絶縁筒部８２Ｂはガラス繊維
強化プラスチックより形成されている。両側の絶縁筒部
８２Ａ，８２Ｃの外径端部にねじ部を形成するととも
に、中間の絶縁筒部８２Ｂの内径端部にもねじ部を形成
し、接合部２６は、絶縁筒部８２Ａ，８２Ｃと絶縁筒部
８２Ｂとのねじ止めによって接合されている。図４のそ
の他は、図１の構成と同じである。この接合構成によっ
ても絶縁筒８２が機械的に丈夫になる。なお、接合部２
６は、接着材を介して接合させる構造にしてもよい。FIG. 4 is a sectional view of a main part showing a configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention. Three insulating cylinder portions 82 in which the insulating cylinder 82 is connected in the axial direction
A, 82B, and 82C, and the insulating tubular portions 8 on both sides.
2A and 82C are formed of polytetrafluoroethylene, and the intermediate insulating cylinder portion 82B is formed of glass fiber reinforced plastic. Threads are formed at the outer diameter ends of the insulating cylinder portions 82A, 82C on both sides, and screw portions are also formed at the inner diameter ends of the intermediate insulating cylinder portion 82B. And the insulating tubular portion 82B are joined by screwing. The rest of FIG. 4 is the same as the configuration of FIG. This joining structure also makes the insulating cylinder 82 mechanically strong. The joint 2
6 may be configured to be joined via an adhesive.
【００１９】[0019]
【発明の効果】この発明は前述のように、絶縁筒が軸方
向に繋がる３つの絶縁筒部からなり、両側の絶縁筒部が
それぞれ金属シールドに固定されるとともに中間の絶縁
筒部が金属シールドの端部から軸方向に離れた位置で両
側の絶縁筒部に接合され、両側の絶縁筒部の比誘電率が
中間の絶縁筒部のそれより小さくなるようにすることに
よって、絶縁筒にかかる電界が緩和され、遮断器を縮小
化することができる。According to the present invention, as described above, the insulating tube is composed of three insulating tube portions connected in the axial direction, the insulating tube portions on both sides are respectively fixed to the metal shield, and the intermediate insulating tube portion is the metal shield. It is joined to the insulating cylinders on both sides at a position axially away from the end of the cylinder, and the relative dielectric constant of the insulating cylinders on both sides is made smaller than that of the middle insulating cylinder so that the insulating cylinders The electric field is reduced, and the circuit breaker can be reduced in size.
【００２０】また、かかる構成において、両側の絶縁筒
部がポリテトラフルオルエチレンよりなるとともに、中
間の絶縁筒部がガラス繊維強化プラスチックよりなるよ
うにしてもよい。ポリテトラフルオルエチレンの比誘電
率が２、ガラス繊維強化プラスチックの比誘電率が５な
ので、絶縁筒の中間部にかかる電界が緩和される。ま
た、かかる構成において、両側の絶縁筒部と中間の絶縁
筒部との接合部が切欠き部の嵌め合い構造によって接合
されることによって、絶縁筒か機械的に丈夫になり、遮
断器の信頼性が向上する。Further, in such a configuration, the insulating tubular portions on both sides may be made of polytetrafluoroethylene, and the intermediate insulating tubular portion may be made of glass fiber reinforced plastic. Since the relative permittivity of polytetrafluoroethylene is 2 and the relative permittivity of glass fiber reinforced plastic is 5, the electric field applied to the intermediate portion of the insulating cylinder is reduced. Further, in such a configuration, the joint between the insulating tubular portion on both sides and the intermediate insulating tubular portion is joined by the notch fitting structure, so that the insulating tube becomes mechanically strong, and the reliability of the circuit breaker is improved. The performance is improved.
【００２１】また、かかる構成において、両側の絶縁筒
部と中間の絶縁筒部との接合部が両ねじの嵌め合い構造
によって接合されることによっても、絶縁筒か機械的に
丈夫になり、遮断器の信頼性が向上する。Further, in this configuration, the insulating cylinder is made mechanically strong even when the joint between the insulating cylinder on both sides and the intermediate insulating cylinder is joined by a fitting structure of both screws, so that the insulating cylinder is cut off. The reliability of the vessel is improved.
【図１】この発明の実施例にかかるパッファ形ガス遮断
器の構成を示す要部断面図FIG. 1 is a sectional view of a main part showing a configuration of a puffer type gas circuit breaker according to an embodiment of the present invention.
【図２】図１の要部拡大断面図FIG. 2 is an enlarged sectional view of a main part of FIG. 1;
【図３】この発明の異なる実施例にかかるパッファ形ガ
ス遮断器の構成を示す要部断面図FIG. 3 is a sectional view of a main part showing a configuration of a puffer type gas circuit breaker according to another embodiment of the present invention.
【図４】この発明のさらに異なる実施例にかかるパッフ
ァ形ガス遮断器の構成を示す要部断面図FIG. 4 is a sectional view of a main part showing a configuration of a puffer type gas circuit breaker according to still another embodiment of the present invention.
【図５】従来のパッファ形ガス遮断器の構成を示す要部
断面図FIG. 5 is a sectional view of a main part showing a configuration of a conventional puffer type gas circuit breaker.
【図６】図５の要部拡大断面図FIG. 6 is an enlarged sectional view of a main part of FIG. 5;
【図７】図５の装置における電位分布図FIG. 7 is a potential distribution diagram in the device of FIG.
【図８】図７の絶縁筒周辺の拡大電位分布図FIG. 8 is an enlarged potential distribution diagram around the insulating cylinder of FIG. 7;
【図９】図２の絶縁筒周辺の拡大電位分布図FIG. 9 is an enlarged potential distribution diagram around the insulating cylinder of FIG. 2;
【図１０】図１の実施例における絶縁筒沿面の電界が緩
和される理由を説明する等価回路図FIG. 10 is an equivalent circuit diagram for explaining the reason why the electric field along the insulating cylinder is reduced in the embodiment of FIG. 1;
６：密閉タンク、７，９：シールド、８：絶縁筒、１
０：固定通電接点、１１：固定アーク接点、１３：可動
アーク接点、１４：可動通電接点、１５：パッファシリ
ンダ、１５Ａ：パッファ室、１６：固定ピストン、８
０，８１，８２：絶縁筒、８０Ａ，８０Ｃ，８１Ａ，８
１Ｃ，８２Ａ，８２Ｃ：両端の絶縁筒部、８０Ｂ，８１
Ｂ，８２Ｂ：中間の絶縁筒部6: closed tank, 7, 9: shielded, 8: insulating cylinder, 1
0: fixed energizing contact, 11: fixed arc contact, 13: movable arc contact, 14: movable energizing contact, 15: puffer cylinder, 15A: puffer chamber, 16: fixed piston, 8
0, 81, 82: insulating cylinder, 80A, 80C, 81A, 8
1C, 82A, 82C: insulating tubular portions at both ends, 80B, 81
B, 82B: middle insulating cylinder
Claims (4)
棒状導体よりなる固定アーク接点と、この固定アーク接
点の軸方向に移動可能であり固定アーク接点と接離する
可動アーク接点と、この可動アーク接点の反固定アーク
接点側に取り付けられ内部にパッファ室を形成するパッ
ファシリンダと、パッファ室内に配されパッファシリン
ダが反固定アーク接点側へ移動するとともにパッファ室
内の消弧性ガスを圧縮する固定ピストンと、固定アーク
接点の外周を囲むとともに固定アーク接点と導通する固
定通電接点と、可動アーク接点の外周を囲み、可動アー
ク接点と導通するとともに固定通電接点と接離する可動
通電接点と、この可動通電接点および固定通電接点の外
周を囲むとともに可動通電接点の移動方向に中心軸が向
けられて配された絶縁筒と、この絶縁筒の軸方向の両端
部に取り付けられそれぞれが固定通電接点側、固定ピス
トン側に固定された一対の金属シールドとにより構成さ
れ、遮断動作時に固定通電接点と可動通電接点とが開離
した後で固定アーク接点と可動アーク接点とが開離し、
固定アーク接点と可動アーク接点との開離間隙に生ずる
アークがパッファシリンダからの圧縮ガスで吹き消され
てなるパッファ形ガス遮断器において、前記絶縁筒が軸
方向に繋がる３つの絶縁筒部からなり、両側の絶縁筒部
がそれぞれ金属シールドに固定されるとともに中間の絶
縁筒部が金属シールドの端部から軸方向に離れた位置で
両側の絶縁筒部に接合され、両側の絶縁筒部の比誘電率
が中間の絶縁筒部のそれより小さいことを特徴とするパ
ッファ形ガス遮断器。In a closed tank filled with an arc-extinguishing gas,
A fixed arc contact made of a rod-shaped conductor, a movable arc contact movable in the axial direction of the fixed arc contact and coming into contact with or separated from the fixed arc contact; and a puffer chamber mounted inside the movable arc contact on the side opposite to the fixed arc contact. And a fixed piston arranged in the puffer chamber, the puffer cylinder moving toward the counter-fixed arc contact side and compressing the arc-extinguishing gas in the puffer chamber, and a fixed arc contact surrounding the outer periphery of the fixed arc contact. A fixed conducting contact that conducts, a movable conducting contact that surrounds the outer periphery of the movable arc contact, conducts with the movable arc contact, and contacts and separates from the fixed conducting contact, and a movable conducting contact that surrounds the outer periphery of the movable conducting contact and the fixed conducting contact. Insulating cylinder with the central axis oriented in the direction of movement of the cylinder, and attached to both axial ends of the insulating cylinder Each consists of a pair of metal shields fixed to the fixed energizing contact side and the fixed piston side.After the fixed energizing contact and the movable energizing contact are separated during the breaking operation, the fixed arc contact and the movable arc contact Are separated,
In a puffer type gas circuit breaker in which an arc generated in an opening gap between a fixed arc contact and a movable arc contact is blown out by a compressed gas from a puffer cylinder, the insulating cylinder comprises three insulating cylinder portions connected in the axial direction. , The insulating cylinders on both sides are fixed to the metal shield respectively, and the intermediate insulating cylinder is joined to the insulating cylinders on both sides at a position axially away from the end of the metal shield. A puffer type gas circuit breaker having a dielectric constant smaller than that of an intermediate insulating cylinder.
おいて、両側の絶縁筒部がポリテトラフルオルエチレン
よりなるとともに、中間の絶縁筒部がガラス繊維強化プ
ラスチックよりなることを特徴とするパッファ形ガス遮
断器。2. The puffer-type gas circuit breaker according to claim 1, wherein the insulating tubular portions on both sides are made of polytetrafluoroethylene, and the intermediate insulating tubular portion is made of glass fiber reinforced plastic. Puffer type gas circuit breaker.
遮断器において、両側の絶縁筒部と中間の絶縁筒部との
接合部が切欠き部の嵌め合い構造によって接合されたこ
とを特徴とするパッファ形ガス遮断器。3. The puffer-type gas circuit breaker according to claim 1, wherein a joint between the insulating tubular portion on both sides and the intermediate insulating tubular portion is joined by a notch fitting structure. Puffer type gas circuit breaker.
ファ形ガス遮断器において、両側の絶縁筒部と中間の絶
縁筒部との接合部が両ねじの嵌め合い構造によって接合
されたことを特徴とするパッファ形ガス遮断器。4. A puffer-type gas circuit breaker according to claim 1, wherein the joint between the insulating cylinder on both sides and the intermediate insulating cylinder is joined by a double screw fitting structure. A puffer type gas circuit breaker characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27995698A JP3815082B2 (en) | 1998-10-01 | 1998-10-01 | Puffer type gas circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27995698A JP3815082B2 (en) | 1998-10-01 | 1998-10-01 | Puffer type gas circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000113782A true JP2000113782A (en) | 2000-04-21 |
| JP3815082B2 JP3815082B2 (en) | 2006-08-30 |
Family
ID=17618276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27995698A Expired - Fee Related JP3815082B2 (en) | 1998-10-01 | 1998-10-01 | Puffer type gas circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3815082B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057568A (en) * | 2016-07-07 | 2016-10-26 | 山东泰开高压开关有限公司 | Composite insulation pillar type SF6 breaker |
-
1998
- 1998-10-01 JP JP27995698A patent/JP3815082B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106057568A (en) * | 2016-07-07 | 2016-10-26 | 山东泰开高压开关有限公司 | Composite insulation pillar type SF6 breaker |
| CN106057568B (en) * | 2016-07-07 | 2019-04-23 | 山东泰开高压开关有限公司 | A kind of compound inslation column support type SF6 breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3815082B2 (en) | 2006-08-30 |
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