JP2013073879A

JP2013073879A - Puffer type gas circuit breaker

Info

Publication number: JP2013073879A
Application number: JP2011214007A
Authority: JP
Inventors: Hideaki Uchiyama; 英昭内山; Masaru Sato; 賢佐藤; Makoto Hirose; 誠廣瀬
Original assignee: Hitachi Ltd
Current assignee: Hitachi Ltd
Priority date: 2011-09-29
Filing date: 2011-09-29
Publication date: 2013-04-22
Anticipated expiration: 2031-09-29
Also published as: JP5459283B2

Abstract

PROBLEM TO BE SOLVED: To provide a puffer type gas circuit breaker with high reliability by preventing deterioration of insulation performance by preventing movement of a conductive foreign matter to be generated at a breaking part in ark generation to an insulation cylinder.SOLUTION: In a puffer type gas circuit breaker constituted by arranging a pair of fixed side contact and a movable side contact so as to face each other in an air-tight container 1 with which insulation gas is filled and fixing a movable side center conductor 18 inside the air-tight container 1 by an insulation cylinder 11, a through hole 18a of the movable side center conductor 18 is provided with a cover 10 which vertically moves according to vertical movement of an operation rod 13 to be generated by a breaking operation while holding the operation rod 13. The cover 10 has a center hole 10a into which the operation rod 13 is loosely inserted, and a bolt loose insertion hole 10b in the elliptical shape in the vertical direction on both sides of the cover 10, and is constituted as size so that the through hole 18a is blocked when the cover 10 is pressurized to the through hole 18a due to gas flow generated at the breaking part at a point of time when an arc is generated.

Description

本発明は、パッファ形ガス遮断器に係り、特に、遮断部等で生じた導電性異物が密閉容器内を移動する場合でも絶縁性能の低下を防止することのできる信頼性の高いパッファ形ガス遮断器に関する。 The present invention relates to a puffer-type gas circuit breaker, and more particularly, a highly reliable puffer-type gas circuit breaker that can prevent deterioration of insulation performance even when conductive foreign matter generated in a breaker or the like moves in a sealed container. Related to the vessel.

電力系統の変電所等においては遮断器が不可欠であるが、特に高電圧の電力系統においては優れた遮断性能が要求されるため、パッファ形ガス遮断器が用いられる。パッファ形ガス遮断器は、ＳＦ_６ガス等の絶縁性ガスを封入した接地密閉容器内に、固定電極部と可動電極部とを接離自在に対向配置して収納し、遮断動作時に可動電極部と連動してガスを圧縮するパッファ部を備えたものである。かかる構成のパッファ形ガス遮断器は、遮断動作時に、パッファ部によって圧縮された絶縁性ガスを、固定電極部と可動電極部との間に点弧したアーク電流に強制的に吹き付けて消弧するため、高い遮断性能を得ることができる。 Circuit breakers are indispensable in power system substations and the like, but puffer type gas circuit breakers are used because excellent circuit breaker performance is required particularly in high voltage power systems. The puffer type gas circuit breaker stores the fixed electrode part and the movable electrode part in a grounded sealed container filled with an insulating gas such as SF ₆ gas so as to be contacted and separated from each other. It has a puffer part that compresses gas in conjunction with it. The puffer-type gas circuit breaker having such a configuration extinguishes the insulating gas compressed by the puffer part by forcibly blowing the arc current ignited between the fixed electrode part and the movable electrode part during the breaking operation. Therefore, high blocking performance can be obtained.

パッファ形ガス遮断器は、電流遮断時に遮断接点部の金属がアークによって溶融し金属異物を生じることがある。この導電性異物が密閉容器内を移動することで様々な要因から耐電性能を低下させ地絡に至ることがある。 In the puffer-type gas circuit breaker, when the current is interrupted, the metal at the interrupting contact portion may be melted by the arc to generate a metal foreign object. Due to the movement of the conductive foreign matter in the sealed container, the electric resistance performance may be reduced due to various factors, leading to a ground fault.

このようなリスクを低減するために、特許文献１には、パッファ形ガス遮断器の絶縁筒内において排気ガスによる導電性異物の移動があった場合でも、絶縁性能の低下を防止することを目的としたパッファ形ガス遮断器の発明が開示されている。 In order to reduce such a risk, Patent Document 1 aims to prevent a decrease in insulation performance even when conductive foreign matter moves due to exhaust gas in an insulating cylinder of a puffer-type gas circuit breaker. An invention of a puffer-type gas circuit breaker is disclosed.

特許文献１図１に示す第１の実施形態は、絶縁筒１３の内径に、パッファ部側（高電圧部側）から操作機構部側（接地電位側）に向かって広がる傾斜が設けられていることを特徴とする。そして、絶縁筒１３の内側面の変曲点１３ａは、絶縁筒１３の軸方向の中央部よりも操作機構部側に形成されている。 In the first embodiment shown in FIG. 1, the inner diameter of the insulating cylinder 13 is provided with an inclination that widens from the puffer part side (high voltage part side) toward the operation mechanism part side (ground potential side). It is characterized by that. The inflection point 13 a on the inner surface of the insulating cylinder 13 is formed closer to the operation mechanism section than the axial center of the insulating cylinder 13.

この構成においては、電流遮断に際して発生する熱ガス流によって、導電性異物１０がパッファ部内を通って絶縁筒１３の内部に侵入するが、絶縁筒１３の内径が操作機構部に向かって漸次拡大しているので、導電性異物１０の大部分は高電圧部側であるパッファ部側に定着することができずに、最終的に操作機構部側の変曲点１３ａに滞留することになる。 In this configuration, the conductive foreign material 10 enters the inside of the insulating cylinder 13 through the puffer due to the hot gas flow generated when the current is interrupted, but the inner diameter of the insulating cylinder 13 gradually increases toward the operation mechanism. Therefore, most of the conductive foreign material 10 cannot be fixed on the puffer portion side, which is the high voltage portion side, and eventually stays at the inflection point 13a on the operation mechanism portion side.

特許文献１によれば、絶縁筒１３内部においては、高電圧部側の電界は強く、接地電位側の電界は弱いため、導電性異物１０の滞留箇所が接地電位側である操作機構部側にあれば、電界条件上裕度があることになり、絶縁性能の低下を防止することができる、としている。 According to Patent Document 1, since the electric field on the high voltage part side is strong and the electric field on the ground potential side is weak inside the insulating cylinder 13, the staying portion of the conductive foreign material 10 is on the operation mechanism part side on the ground potential side. If so, there is a margin in terms of electric field conditions, and a decrease in insulation performance can be prevented.

また、特許文献１図２に示す第２の実施形態は、絶縁筒９と絶縁筒支持台１１との間に、絶縁操作ロッド１６の電界緩和用のシールド１５が設けられ、このシールド１５の下部には絶縁性ガスが通過可能な通気孔が形成されていることを特徴とする。 Further, in the second embodiment shown in FIG. 2 of Patent Document 1, a shield 15 for electric field relaxation of the insulating operation rod 16 is provided between the insulating cylinder 9 and the insulating cylinder support 11, and a lower part of the shield 15 is provided. Is characterized in that a vent hole through which an insulating gas can pass is formed.

この第２の実施形態の構成においては、電流遮断に際して発生する熱ガス流によって、導電性異物１０がシールド１５の下部を通過して絶縁筒支持台１１内部へ移動する。すなわち、熱ガス流によって、導電性異物１０の絶縁筒９内への滞留が防止され、絶縁筒９内部を常に清浄な状態に維持することができるので、絶縁性能の低下を防止することができる、としている。 In the configuration of the second embodiment, the conductive foreign material 10 passes through the lower part of the shield 15 and moves into the insulating cylinder support 11 due to the hot gas flow generated when the current is interrupted. That is, the hot gas flow prevents the staying of the conductive foreign substance 10 in the insulating cylinder 9 and the inside of the insulating cylinder 9 can be always maintained in a clean state, so that it is possible to prevent a decrease in insulation performance. , And.

特許文献１によれば、上記図１及び図２に示すパッファ形ガス遮断器は、導電性異物をパッファ部側から遠ざけ接地電位側である操作機構部側に移動させることで、導電性異物による絶縁性能の低下を防止することができる、としている。 According to Patent Document 1, the puffer-type gas circuit breaker shown in FIGS. 1 and 2 moves away from the puffer part side to the operation mechanism part side which is the ground potential side, thereby causing the It is said that deterioration of insulation performance can be prevented.

特開平９−１３４６５１号公報Japanese Patent Laid-Open No. 9-134651

しかし、特許文献１図１に示すパッファ形ガス遮断器では、導電性異物１０を絶縁筒１３の内径に滞留させるため、導電性異物１０の滞留した箇所が絶縁上の弱点となるおそれがある。 However, in the puffer-type gas circuit breaker shown in FIG. 1 of Patent Document 1, since the conductive foreign material 10 stays in the inner diameter of the insulating cylinder 13, the portion where the conductive foreign material 10 stays may become a weak point in insulation.

また、特許文献１図２に示すパッファ形ガス遮断器では、導電性異物１０が絶縁筒支持台１１に移動して付着すると、可動側通電部と接地密閉容器との絶縁距離を十分確保できなくなり、部分放電や絶縁破壊を生じるおそれが高くなる。 Further, in the puffer-type gas circuit breaker shown in FIG. 2 of Patent Document 1, if the conductive foreign material 10 moves and adheres to the insulating cylinder support base 11, it is impossible to secure a sufficient insulation distance between the movable side energizing portion and the grounded sealed container. The risk of partial discharge and dielectric breakdown increases.

本発明は、上記の問題に鑑み、遮断部で生じた熱ガス流により導電性異物が移動する場合でも、導電性異物が接地密閉容器内の絶縁物に付着することを防いで絶縁性能の低下を防止し、信頼性の高いパッファ形ガス遮断器を提供することを目的とする。 In view of the above-mentioned problems, the present invention prevents the conductive foreign matter from adhering to the insulator in the grounded sealed container even when the conductive foreign matter moves due to the hot gas flow generated in the blocking portion. It is an object of the present invention to provide a highly reliable puffer-type gas circuit breaker.

上記目的を達成するため、請求項１記載のパッファ形ガス遮断器は、絶縁ガスを充填する密閉容器と、前記密閉容器内に対向配置された固定側主接触子及び可動側主接触子と、前記固定側主接触子及び前記可動側主接触子の内側にそれぞれ同心円状に設けられた固定側アーク接触子及び可動側アーク接触子と、前記固定側主接触子及び前記固定側アーク接触子が電気的に接続する固定側中心導体と、前記可動側アーク接触子が先端に設けられたパッファシリンダと、前記パッファシリンダの内側に同心円状に設けられたパッファシャフトと、前記パッファシャフトと操作レバーを連結する操作ロッドと、前記パッファシリンダの外側に同心円状に設けられ、前記パッファシリンダと電気的に接続され、前記操作ロッドが貫通する貫通孔を有する可動側中心導体と、前記可動側中心導体を前記密閉容器内に固定し、前記可動側中心導体とほぼ同軸上に設けられた絶縁支持部材と、前記パッファシリンダと前記パッファシャフトで形成される空間の内面を摺動するパッファピストンとで構成され、前記可動側中心導体に、前記貫通孔よりも大きい形状を有し、前記操作ロッドを遊挿しつつ遮断動作により生じる前記操作ロッドの上下動に応じて上下動する封止部材を設けることにより、前記操作ロッドの周囲に形成される前記貫通孔の間隙を塞ぐようにしたことを特徴とする。 In order to achieve the above object, a puffer-type gas circuit breaker according to claim 1 includes a sealed container filled with an insulating gas, a fixed-side main contactor and a movable-side main contactor arranged to face each other in the sealed container, A fixed-side arc contact and a movable-side arc contact provided concentrically inside the fixed-side main contact and the movable-side main contact, respectively, and the fixed-side main contact and the fixed-side arc contact A fixed-side central conductor for electrical connection, a puffer cylinder provided with a tip of the movable-side arc contact, a puffer shaft provided concentrically on the inner side of the puffer cylinder, the puffer shaft and an operating lever. An operating rod to be coupled, and a concentric circle provided outside the puffer cylinder, electrically connected to the puffer cylinder, and having a through hole through which the operating rod passes. A space formed by a movable central conductor, the movable central conductor fixed in the sealed container, an insulating support member provided substantially coaxially with the movable central conductor, the puffer cylinder, and the puffer shaft. A buffer piston that slides on the inner surface of the movable side, and has a shape larger than the through hole in the movable-side central conductor, and responds to the vertical movement of the operation rod caused by the blocking operation while the operation rod is loosely inserted. By providing a sealing member that moves up and down, the gap between the through holes formed around the operation rod is closed.

ここで、上記記載の「封止部材」とは、上記パッファ形ガス遮断器でアークが発生した時点において、遮断部で生じたガス流により上記貫通孔に押し付けられた場合にその貫通孔を塞ぐことができるように上記貫通孔よりも大きなものであれば、特にその形状は限定されない。 Here, the above-described “sealing member” means that when an arc is generated in the puffer-type gas circuit breaker, the through hole is blocked when pressed against the through hole by the gas flow generated in the blocking portion. The shape is not particularly limited as long as it is larger than the through hole so that it can be formed.

請求項２記載の発明は、請求項１記載のパッファ形ガス遮断器において、前記封止部材は、前記操作ロッドが遊挿される中心孔と、前記中心孔の両側に垂直方向に楕円形状のボルト遊嵌孔を有し、ボルトにより前記可動側中心導体に取り付けられることを特徴とする。 According to a second aspect of the present invention, in the puffer-type gas circuit breaker according to the first aspect, the sealing member includes a center hole into which the operation rod is loosely inserted, and an elliptical bolt in a vertical direction on both sides of the center hole. It has a loose fitting hole and is attached to the movable side central conductor by a bolt.

請求項３記載の発明は、請求項１記載のパッファ形ガス遮断器において、前記封止部材は、前記操作ロッドが遊挿される中心孔を有し、前記可動側中心導体の操作レバー側端部に設けられた円筒状のガイド内に設けられることを特徴とする。 According to a third aspect of the present invention, in the puffer type gas circuit breaker according to the first aspect, the sealing member has a center hole into which the operation rod is loosely inserted, and an end portion on the operation lever side of the movable side central conductor. It is provided in the cylindrical guide provided in the.

本発明のカバーを上記の通り貫通孔を塞ぐように上下方向に移動自在に構成することで、アーク発生時に遮断部で生ずる導電性異物が絶縁筒１１へ入り込むことを防止することができる。これにより、簡易な構成を用いて絶縁性能の低下を防止し、信頼性の高いパッファ形ガス遮断器を提供することができる。 By configuring the cover of the present invention so as to be movable in the vertical direction so as to close the through-hole as described above, it is possible to prevent the conductive foreign matter generated at the blocking portion when the arc is generated from entering the insulating cylinder 11. Thereby, the fall of insulation performance can be prevented using a simple structure, and a highly reliable puffer type gas circuit breaker can be provided.

本発明のパッファ形ガス遮断器の投入状態を示す側面断面図である。It is side surface sectional drawing which shows the injection state of the puffer type gas circuit breaker of this invention. 本発明のパッファ形ガス遮断器の遮断途中状態（アーク発生時）を示す側面断面図である。It is side surface sectional drawing which shows the state in the middle of interruption | blocking (at the time of arc generation | occurrence | production) of the puffer type gas circuit breaker of this invention. 本発明のパッファ形ガス遮断器の遮断終了状態を示す側面断面図である。It is side surface sectional drawing which shows the interruption | blocking completion state of the puffer type gas circuit breaker of this invention. 本発明の実施例１の要部拡大断面図である。It is a principal part expanded sectional view of Example 1 of this invention. 本発明の実施例２の要部拡大断面図である。It is a principal part expanded sectional view of Example 2 of the present invention. 図４に示すカバー１０の一実施例である。図６（ａ）は平面図であり、図６（ｂ）は側面図である。It is one Example of the cover 10 shown in FIG. FIG. 6A is a plan view, and FIG. 6B is a side view. 図４に示すカバー１０の他の実施例である。図７（ａ）は平面図であり、図７（ｂ）は側面図である。It is another Example of the cover 10 shown in FIG. FIG. 7A is a plan view, and FIG. 7B is a side view. 本発明の実施例２の操作ロッド側端部を示す側面断面図である。It is side surface sectional drawing which shows the operation rod side edge part of Example 2 of this invention.

以下、本発明のパッファ式ガス遮断器を図面に基づいて説明する。図１は、本発明によるパッファ式ガス遮断器の一実施例の遮断部投入状態を示す。 Hereinafter, the puffer type gas circuit breaker of the present invention will be described with reference to the drawings. FIG. 1 shows a state where a breaker is turned on in an embodiment of a puffer type gas circuit breaker according to the present invention.

ＳＦ_６ガス等の絶縁ガスを充填した密閉容器１内にそれぞれ環状の固定側主接触子５及び可動側主接触子４が対向して同一軸上に設けられる。固定側主接触子５の内側には同心円状に固定側アーク接触子２が設けられる。可動側主接触子４の内側には同心円状に可動側アーク接触子３が設けられる。 In the sealed container 1 filled with an insulating gas such as SF ₆ gas, the annular fixed main contact 5 and the movable main contact 4 are respectively provided on the same axis so as to face each other. The fixed-side arc contact 2 is provided concentrically inside the fixed-side main contact 5. A movable arc contact 3 is provided concentrically inside the movable main contact 4.

固定側主接触子５及び固定側アーク接触子２は、固定側中心導体１７と電気的に接続される。可動側主接触子４及び可動側アーク接触子３は、パッファシリンダ７を介して可動側中心導体１８と電気的に接続される。 The stationary main contact 5 and the stationary arc contact 2 are electrically connected to the stationary central conductor 17. The movable main contact 4 and the movable arc contact 3 are electrically connected to the movable central conductor 18 via the puffer cylinder 7.

可動側アーク接触子３はパッファシリンダ７の先端に設けられる。パッファシリンダ７の内側にはパッファシャフト８が同心円状に設けられ、その間をパッファピストン９が摺動するように構成する。パッファシャフト８の一端はパッファシリンダ７に固定され、パッファシャフト８の他端は絶縁性の操作ロッド１３に連結される。操作ロッド１３は操作レバー１２を介して操作器（不図示）に連結される。これにより操作器（不図示）の駆動力が可動側に伝えられる。 The movable side arc contact 3 is provided at the tip of the puffer cylinder 7. A puffer shaft 8 is provided concentrically inside the puffer cylinder 7, and a puffer piston 9 slides between them. One end of the puffer shaft 8 is fixed to the puffer cylinder 7, and the other end of the puffer shaft 8 is connected to an insulating operation rod 13. The operating rod 13 is connected to an operating device (not shown) via the operating lever 12. Thereby, the driving force of the operating device (not shown) is transmitted to the movable side.

絶縁ノズル６は、可動側主接触子４と可動側アーク接触子３の間にこれらと同心円状に設けられ、パッファ室１９内で圧縮された絶縁ガスを固定側アーク接触子２及び可動側アーク接触子３間に生じたアークに吹き付けるように構成される。パッファ室１９は、パッファシャフト８、パッファシリンダ７及びパッファピストン９により囲まれた空間として構成される。 The insulating nozzle 6 is provided concentrically between the movable side main contact 4 and the movable side arc contact 3, and the insulating gas compressed in the puffer chamber 19 is supplied to the fixed side arc contact 2 and the movable side arc. It is configured to spray an arc generated between the contacts 3. The puffer chamber 19 is configured as a space surrounded by the puffer shaft 8, the puffer cylinder 7 and the puffer piston 9.

図４は実施例１の要部拡大断面図である。これは、可動側中心導体１８の操作レバー側端部を上側から見たものである。可動側中心導体１８は絶縁筒１１により密閉容器１内に保持される。可動側中心導体１８と絶縁筒１１は同心円状に構成するのが好ましい。操作ロッド１３はカバー１０に遊挿される。カバー１０は貫通孔１８ａよりも大きい形状を有し、ボルト１４とナット１５によって操作ロッド１３の周囲に形成される貫通孔１８ａの間隙を塞ぐように可動側中心導体１８の操作レバー側端部に取り付けられる。 4 is an enlarged cross-sectional view of a main part of the first embodiment. This is the operation lever side end of the movable side central conductor 18 as viewed from above. The movable side central conductor 18 is held in the sealed container 1 by the insulating cylinder 11. The movable side central conductor 18 and the insulating cylinder 11 are preferably configured concentrically. The operation rod 13 is loosely inserted into the cover 10. The cover 10 has a shape larger than that of the through hole 18a, and is formed at the end of the movable side central conductor 18 on the operation lever side so as to close the gap between the through hole 18a formed around the operation rod 13 by the bolt 14 and the nut 15. It is attached.

カバー１０は、フッ素樹脂製が好ましく、特に４フッ化エチレン樹脂製が好ましい。また、カバー１０は、例えば図６及び図７に示すように、中心孔１０ａ及びその両側のボルト遊嵌孔１０ｂにより構成される。 The cover 10 is preferably made of fluororesin, and particularly preferably made of tetrafluoroethylene resin. Moreover, the cover 10 is comprised by the center hole 10a and the bolt loose fitting hole 10b of the both sides as shown, for example in FIG.6 and FIG.7.

図６（ａ）及び図７（ａ）に示すように、中心孔１０ａは、軸方向に移動を繰り返す操作ロッド１３が遊挿されるため、破損しないように操作ロッド１３の断面よりも若干大きめに構成する。但し、中心孔１０ａと操作ロッド１３の隙間は、アーク発生時に遮断部で生じる高温高圧のガスがその隙間から絶縁筒１１側に流出するのを最小限に抑えるため、できる限り狭く構成する。なお、図６（ａ）は操作ロッド１３の断面形状が矩形の例を示し、図７（ａ）は操作ロッド１３の断面形状が円形の例を示している。操作ロッド１３の断面形状がその他の形状であっても同様である。 As shown in FIGS. 6 (a) and 7 (a), the center hole 10a is slightly larger than the cross section of the operation rod 13 so as not to break because the operation rod 13 that repeats movement in the axial direction is loosely inserted. Configure. However, the gap between the center hole 10a and the operating rod 13 is made as narrow as possible in order to minimize the flow of high-temperature and high-pressure gas generated at the interrupting portion when an arc is generated to the insulating cylinder 11 side. 6A shows an example in which the cross section of the operating rod 13 is rectangular, and FIG. 7A shows an example in which the cross section of the operating rod 13 is circular. The same applies even if the cross-sectional shape of the operating rod 13 is other shapes.

図６（ａ）及び図７（ａ）に示すボルト遊嵌孔１０ｂは、例えば、縦方向に楕円状であって、図４に示すように、２組のボルトとナットによって可動側中心導体１８の操作レバー側端部に取り付ける。可動側中心導体１８の操作レバー側端部にはねじ切りを施したボルト締結用孔が２つ設けられており、ボルト１４をボルト締結用孔に操作器側から遮断部側に向けてねじ込む。次に、ボルト１４にカバー１０のボルト遊嵌孔１０ｂを通し、ボルト１４の先端部にナット１５を螺合する。 The bolt loosely fitting hole 10b shown in FIGS. 6 (a) and 7 (a) is, for example, elliptical in the vertical direction, and as shown in FIG. 4, the movable-side central conductor 18 is composed of two sets of bolts and nuts. Attach to the end of the control lever. Two bolt fastening holes, which are threaded, are provided at the end of the movable side central conductor 18 on the operation lever side, and the bolts 14 are screwed into the bolt fastening holes from the operating device side toward the blocking portion side. Next, the bolt 14 is passed through the bolt loose fitting hole 10 b of the cover 10, and the nut 15 is screwed into the tip of the bolt 14.

ナット１５とカバー１０の間には若干遊びを持たせることで操作ロッド１３の動きに伴うカバー１０の動きを吸収する。また、ボルト遊嵌孔１０ｂは、操作ロッド１３の上下動に伴うカバー１０の上下動により、カバー１０がボルト１４と接触して破損しないよう、適宜軸方向の長さを調整する。このように構成することで、カバー１０はボルト遊嵌孔１０ｂの軸方向、すなわち遮断器の上下方向に移動自在となる。 A slight play is provided between the nut 15 and the cover 10 to absorb the movement of the cover 10 accompanying the movement of the operation rod 13. Further, the bolt loosely fitting hole 10b is appropriately adjusted in length in the axial direction so that the cover 10 does not come into contact with the bolt 14 and is damaged by the vertical movement of the cover 10 accompanying the vertical movement of the operation rod 13. By comprising in this way, the cover 10 becomes movable in the axial direction of the bolt loose fitting hole 10b, that is, the vertical direction of the circuit breaker.

次に、図１〜図３を参照して、本発明に係るパッファ形ガス遮断器の遮断動作との関係でカバー１０を説明する。図１は遮断器の投入状態を示す。この状態では、操作ロッドと操作レバーの接続点１３ａが最も低位置にある。カバー１０は上下方向に移動自在に取り付けられているので、カバー１０も最も低位置に移動する。 Next, the cover 10 will be described with reference to FIGS. 1 to 3 in relation to the shutoff operation of the puffer type gas circuit breaker according to the present invention. FIG. 1 shows the circuit breaker in a charged state. In this state, the connecting point 13a between the operating rod and the operating lever is at the lowest position. Since the cover 10 is attached so as to be movable in the vertical direction, the cover 10 also moves to the lowest position.

この状態から操作器（不図示）の駆動力により操作レバー１２が時計回りに回転し、操作ロッド１３が右方向に移動する。遮断動作が進み図２に示すアーク発生時に至ると、操作ロッドと操作レバーの接続点１３ａは最も高位置に移動する。カバー１０は上下方向に移動自在に取り付けられているので、カバー１０も最も高位置に移動する。 From this state, the operating lever 12 rotates clockwise by the driving force of the operating device (not shown), and the operating rod 13 moves to the right. When the breaking operation proceeds and the arc shown in FIG. 2 occurs, the connecting point 13a between the operating rod and the operating lever moves to the highest position. Since the cover 10 is attached so as to be movable in the vertical direction, the cover 10 also moves to the highest position.

遮断部でアークが生じることにより、高温高圧のガスが遮断部からパッファシャフト８、排気孔８ａを介して操作レバー１３沿いに貫通孔１８ａに向かって移動する。このガス流によりカバー１０は可動側中心導体１８の操作レバー側端部に設けられた貫通孔１８ａに押し付けられる。この状態においてカバー１０は貫通孔１８ａを塞ぐ大きさに設計する。こうすることで、アークの発生により遮断部で生じた導電性異物が絶縁筒１１まで移動して付着するのを防ぐことが可能となる。 When an arc is generated at the blocking portion, the high-temperature and high-pressure gas moves from the blocking portion along the operation lever 13 toward the through hole 18a through the puffer shaft 8 and the exhaust hole 8a. By this gas flow, the cover 10 is pressed against a through hole 18 a provided at the end of the movable side central conductor 18 on the operation lever side. In this state, the cover 10 is designed so as to close the through hole 18a. By doing so, it becomes possible to prevent the conductive foreign matter generated at the blocking portion due to the occurrence of the arc from moving to the insulating cylinder 11 and being attached thereto.

更に動作が進み図３の遮断完了状態に至ると、操作ロッドと操作レバーの接続点１３ａは、図１に示す状態と同様に、最も低位置に移動する。これに応じてカバー１０も最も低位置に移動する。なお、以上は操作レバーが等振分けの場合であるが、操作レバーが不等振分けの場合においても同様に、カバー１０は、アークが発生した時点において遮断部で生じたガス流により貫通孔１８ａに押し付けられた場合に貫通孔１８ａを塞ぐことができる寸法に設計すればよい。 When the operation further proceeds to reach the shut-off completion state in FIG. 3, the connection point 13a between the operation rod and the operation lever moves to the lowest position as in the state shown in FIG. In response to this, the cover 10 also moves to the lowest position. Note that the above is the case where the operation lever is equally distributed. Similarly, even when the operation lever is unevenly distributed, the cover 10 is similarly formed in the through hole 18a by the gas flow generated in the blocking portion when the arc is generated. What is necessary is just to design to the dimension which can block | close the through-hole 18a, when it presses.

とりわけ、パッファ形ガス遮断器の遮断時にアークにより生じた高温高圧のガス流がパッファシャフト８の排気孔８ａを流れ、操作ロッド１３沿いに絶縁筒１１に排出されると、遮断部で生じた導電性異物が絶縁筒１１に付着して短絡事故につながるおそれがある。 In particular, when a high-temperature and high-pressure gas flow generated by an arc when the puffer-type gas circuit breaker is shut off flows through the exhaust hole 8a of the puffer shaft 8 and is discharged along the operation rod 13 to the insulating cylinder 11, the conductivity generated in the shut-off portion There is a possibility that the conductive foreign matter adheres to the insulating cylinder 11 and leads to a short circuit accident.

そのため、本発明では、アーク発生時に可動側中心導体１８の貫通孔１８ａをカバー１０で塞ぐ構造とすることで、アーク発生時に遮断部で生じる高温高圧のガスが、パッファシャフト８内を通過して排気孔８ａから貫通孔１８ａを経て絶縁筒１１内に流入することを防止する。一方、遮断部で生じた高温高圧のガスの抜け道を確保するために、可動側中心導体１８の径方向に排気孔１８ｂを別途設ける。 For this reason, in the present invention, the structure is such that the through hole 18a of the movable center conductor 18 is closed with the cover 10 when an arc is generated, so that the high-temperature and high-pressure gas generated in the blocking portion when the arc is generated passes through the puffer shaft 8. Inflow from the exhaust hole 8a through the through hole 18a into the insulating cylinder 11 is prevented. On the other hand, an exhaust hole 18b is separately provided in the radial direction of the movable-side central conductor 18 in order to ensure a passage of high-temperature and high-pressure gas generated in the blocking portion.

本発明のカバー１０を、上記の通り、アーク発生時において貫通孔１８ａを塞ぐように上下方向に移動自在に構成することで、アークの発生により遮断部で生ずる導電性異物が絶縁筒１１へ入り込むことを効果的に防止することができる。これにより、簡易な構成を用いて耐電圧性能の低下による地絡等を防止し、信頼性の高いパッファ形ガス遮断器を提供することができる。 As described above, the cover 10 of the present invention is configured to be movable in the vertical direction so as to close the through-hole 18a when an arc is generated, so that the conductive foreign matter generated in the blocking portion due to the generation of the arc enters the insulating cylinder 11. This can be effectively prevented. Thereby, it is possible to provide a puffer type gas circuit breaker with high reliability by preventing a ground fault or the like due to a decrease in withstand voltage performance using a simple configuration.

図５に本発明の実施例２を示す。これは、可動側中心導体１８の操作レバー側端部を上側から見たものである。なお、第１の実施例と同様の部分については同じ符号を付し、その詳細な説明は省略する。実施例２においては、図５に示すように、可動側中心導体１８の操作レバー側端部に円筒状のガイド１６をボルト等で固定する。ガイド１６と可動側中心導体１８の操作レバー側端部で形成する空間にカバー１０を配置する。円筒状のガイド１６の中空部１６ａはカバー１０より小径にしてカバー１０がこの空間から外に出ないように構成する。 FIG. 5 shows a second embodiment of the present invention. This is the operation lever side end of the movable side central conductor 18 as viewed from above. In addition, the same code | symbol is attached | subjected about the part similar to a 1st Example, and the detailed description is abbreviate | omitted. In the second embodiment, as shown in FIG. 5, a cylindrical guide 16 is fixed to the end portion on the operation lever side of the movable side central conductor 18 with a bolt or the like. The cover 10 is arranged in a space formed by the guide lever 16 and the operation lever side end of the movable center conductor 18. The hollow portion 16a of the cylindrical guide 16 has a smaller diameter than the cover 10 so that the cover 10 does not come out of this space.

次に、図８に基づいて、操作ロッド１３が上下動するときのカバー１０とガイド１６の関係を説明する。前提として、操作レバー１２は等振分けとする。まず、遮断器の投入時においては、操作ロッド１３は１３_lowで示す状態にある。遮断動作が開始すると操作レバー１２が反時計回りに回転し、遮断途中状態（アーク発生時）において、操作ロッド１３は１３_highで示す状態に移行する。さらに遮断動作が進み遮断動作が完了すると、閉極時と同様に、操作ロッド１３は１３_lowで示す状態に移行する（不図示）。 Next, based on FIG. 8, the relationship between the cover 10 and the guide 16 when the operating rod 13 moves up and down will be described. As a premise, the operation lever 12 is equally distributed. First, when the circuit breaker is turned on, the operating rod 13 is in a state indicated by 13 _low . When the interruption operation starts, the operation lever 12 rotates counterclockwise, and the operation rod 13 shifts to a state indicated by 13 _high in the middle of interruption (when an arc is generated). When the blocking operation further proceeds and the blocking operation is completed, the operating rod 13 shifts to a state indicated by 13 _low (not shown) as in the case of closing.

操作ロッド１３が１３_lowで示す状態にあるときに操作レバー１３が最も低い位置にあるので、カバー１０も最も低い位置に移行する。一方、操作ロッド１３が１３_highで示す状態にあるときに操作レバー１３が最も高い位置にあるので、カバー１０も最も高い位置に移行する。カバー１０の破損を防ぐため、カバー１０の位置が最も高位置と最も低位置にあるときにカバー１０の外周がガイド１６の内周面に接触しないように構成する。 Since the operation lever 13 is in the lowest position when the operation rod 13 is in a state indicated by 13 _low , the cover 10 also moves to the lowest position. On the other hand, since the operation lever 13 is at the highest position when the operation rod 13 is in the state indicated by 13 _high , the cover 10 is also moved to the highest position. In order to prevent damage to the cover 10, the cover 10 is configured such that the outer periphery of the cover 10 does not contact the inner peripheral surface of the guide 16 when the cover 10 is at the highest position and the lowest position.

また、カバー１０の外周面とガイド１６の内周面は互いに接触しない範囲でその間隔がなるべく狭くなるように適宜構成する。こうすることでアーク発生時に遮断部で生じる導電性異物が貫通孔１８ａを通して絶縁筒１１に進入するおそれを低減することができる。 In addition, the outer peripheral surface of the cover 10 and the inner peripheral surface of the guide 16 are appropriately configured so that the distance between them is as small as possible within a range where they do not contact each other. By doing so, it is possible to reduce the possibility that the conductive foreign matter generated at the interruption portion when the arc is generated enters the insulating cylinder 11 through the through hole 18a.

なお、実施例１同様、アーク発生時においてカバー１０が最も高位置に移行するので、この状態でカバー１０が貫通孔１８ａを封止するように構成する。こうすることで、アークの発生により遮断部で生ずる導電性異物が絶縁筒１１へ入り込むことを効果的に防止することができる。これにより、簡易な構成を用いて耐電圧性能の低下による地絡等を防止し、信頼性の高いパッファ形ガス遮断器を提供することができる。 As in the first embodiment, the cover 10 is moved to the highest position when an arc is generated. Therefore, the cover 10 is configured to seal the through hole 18a in this state. By doing so, it is possible to effectively prevent the conductive foreign matter generated in the blocking portion due to the generation of the arc from entering the insulating cylinder 11. Thereby, it is possible to provide a puffer type gas circuit breaker with high reliability by preventing a ground fault or the like due to a decrease in withstand voltage performance using a simple configuration.

さらに、実施例２の構成では、カバー１０には実施例１に示すようなボルト１４とナット１５による保持が不要となるため、カバー１０の動きに起因するボルトの緩みや脱落のおそれがなくなる。これにより、実施例１の構成より信頼性の高いパッファ形ガス遮断器を提供することができる。 Further, in the configuration of the second embodiment, the cover 10 does not need to be held by the bolts 14 and the nuts 15 as shown in the first embodiment, so that there is no possibility of the bolts loosening or dropping due to the movement of the cover 10. Thereby, the puffer type gas circuit breaker having higher reliability than the configuration of the first embodiment can be provided.

１密閉容器
２固定側アーク接触子
３可動側アーク接触子
４可動側主接触子
５固定側主接触子
６絶縁ノズル
７パッファシリンダ
８パッファシャフト
８ａ排気孔
９パッファピストン
１０カバー
１０ａ中心孔
１０ｂボルト遊嵌孔
１１絶縁筒
１２操作レバー
１３操作ロッド
１３ａ操作ロッドと操作レバーの接続点
１４ボルト
１５ナット
１６ガイド
１７固定側中心導体
１８可動側中心導体
１８ａ貫通孔
１８ｂ排気孔 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Fixed side arc contact 3 Movable side arc contact 4 Movable side main contact 5 Fixed side main contact 6 Insulation nozzle 7 Puffer cylinder 8 Puffer shaft 8a Exhaust hole 9 Puffer piston 10 Cover 10a Center hole 10b Bolt play Fitting hole 11 Insulating cylinder 12 Operation lever 13 Operation rod 13a Connection point between operation rod and operation lever 14 Bolt 15 Nut 16 Guide 17 Fixed side center conductor 18 Movable side center conductor 18a Through hole 18b Exhaust hole

Claims

絶縁ガスを充填する密閉容器と、
前記密閉容器内に対向配置された固定側主接触子及び可動側主接触子と、
前記固定側主接触子及び前記可動側主接触子の内側にそれぞれ同心円状に設けられた固定側アーク接触子及び可動側アーク接触子と、
前記固定側主接触子及び前記固定側アーク接触子が電気的に接続する固定側中心導体と、
前記可動側アーク接触子が先端に設けられたパッファシリンダと、
前記パッファシリンダの内側に同心円状に設けられたパッファシャフトと、
前記パッファシャフトと操作レバーを連結する操作ロッドと、
前記パッファシリンダの外側に同心円状に設けられ、前記パッファシリンダと電気的に接続され、前記操作ロッドが貫通する貫通孔を有する可動側中心導体と、
前記可動側中心導体を前記密閉容器内に固定し、前記可動側中心導体とほぼ同軸上に設けられた絶縁支持部材と、
前記パッファシリンダと前記パッファシャフトで形成される空間の内面を摺動するパッファピストンとで構成され、
前記可動側中心導体に、前記貫通孔よりも大きい形状を有し、前記操作ロッドを遊挿しつつ遮断動作により生じる前記操作ロッドの上下動に応じて上下動する封止部材を設けることにより、前記操作ロッドの周囲に形成される前記貫通孔の間隙を塞ぐようにしたことを特徴とする、パッファ形ガス遮断器。 An airtight container filled with insulating gas;
A fixed-side main contactor and a movable-side main contactor arranged opposite to each other in the sealed container;
A fixed side arc contact and a movable side arc contact provided concentrically on the inside of the fixed side main contact and the movable side main contact, respectively;
A fixed-side central conductor to which the fixed-side main contact and the fixed-side arc contact are electrically connected; and
A puffer cylinder provided with the movable arc contact at the tip,
A puffer shaft provided concentrically inside the puffer cylinder;
An operation rod connecting the puffer shaft and the operation lever;
A movable center conductor provided concentrically on the outside of the puffer cylinder, electrically connected to the puffer cylinder, and having a through hole through which the operation rod passes;
The movable side central conductor is fixed in the sealed container, and an insulating support member provided substantially coaxially with the movable side central conductor;
It is composed of a puffer piston that slides on the inner surface of the space formed by the puffer cylinder and the puffer shaft,
The movable side central conductor has a shape larger than the through hole, and by providing a sealing member that moves up and down according to the up and down movement of the operation rod caused by a blocking operation while loosely inserting the operation rod, A puffer-type gas circuit breaker characterized in that a gap between the through holes formed around the operation rod is closed.

前記封止部材は、前記操作ロッドが遊挿される中心孔と、前記中心孔の両側に垂直方向に楕円形状のボルト遊嵌孔を有し、ボルトにより前記可動側中心導体に取り付けられることを特徴とする、請求項１に記載のパッファ形ガス遮断器。 The sealing member has a center hole into which the operation rod is loosely inserted, and an elliptical bolt loose fitting hole on both sides of the center hole, and is attached to the movable side central conductor by a bolt. The puffer type gas circuit breaker according to claim 1.

前記封止部材は、前記操作ロッドが遊挿される中心孔を有し、前記可動側中心導体の操作レバー側端部に設けられた円筒状のガイド内に設けられることを特徴とする、請求項１に記載のパッファ形ガス遮断器。 The sealing member has a center hole into which the operation rod is loosely inserted, and is provided in a cylindrical guide provided at an operation lever side end of the movable side central conductor. The puffer-type gas circuit breaker according to 1.