JP3541657B2 - Gas insulated switchgear and method of replacing branch line unit thereof - Google Patents

Gas insulated switchgear and method of replacing branch line unit thereof Download PDF

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JP3541657B2
JP3541657B2 JP32756797A JP32756797A JP3541657B2 JP 3541657 B2 JP3541657 B2 JP 3541657B2 JP 32756797 A JP32756797 A JP 32756797A JP 32756797 A JP32756797 A JP 32756797A JP 3541657 B2 JP3541657 B2 JP 3541657B2
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main bus
unit
branch line
disconnector
main
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JP32756797A
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JPH11164427A (en
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佳一 津々楽
和彦 高橋
実 矢吹
健一 大久保
博 小沢
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Hitachi Ltd
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Hitachi Ltd
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Priority to TW087118142A priority patent/TW407388B/en
Priority to KR1019980051203A priority patent/KR19990045635A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0352—Gas-insulated switchgear for three phase switchgear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0358—Connections to in or out conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B5/00—Non-enclosed substations; Substations with enclosed and non-enclosed equipment
    • H02B5/06—Non-enclosed substations; Substations with enclosed and non-enclosed equipment gas-insulated

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明はガス絶縁開閉装置の分岐回線ユニット取外し方法に係り、特に事故対応に好適なガス絶縁開閉装置の分岐回線ユニット取外し方法に関する。
【０００２】
【従来の技術】
変電所等の電気所に設置される従来のガス絶縁開閉装置としては、特開昭61−185004号公報に記載のように、第１主母線及び第２主母線に、遮断器等の機器を介して複数の分岐回線を接続する２重主母線構造のものがある。このガス絶縁開閉装置では、遮断器，線路側断路器，接地開閉器，避雷器等の機器を容器内に収納した分岐回線ユニットが所定の間隔をおいて並設され、これらの分岐回線ユニットにそれぞれ、第１主母線を構成する第１主母線断路器ユニットと第２主母線を構成する第２主母線断路器ユニットとが絶縁スペーサを介して接続されている。そして第１主母線断路器ユニット同士が直列に接続されて第１主母線を、第２主母線断路器ユニット同士が直列に接続されて第２主母線を、それぞれ構成している。
【０００３】
上記のような構成のガス絶縁開閉装置でいずれかの分岐回線ユニット内で事故が生じた場合には、事故が生じた分岐回線ユニットを第１及び第２主母線断路器ユニットから取り外して補修を行う必要がある。その際に、電気所全体が停電状態になるのを避けるために、第１及び第２主母線の少なくとも一方を課電状態に保ったままで、分岐回線ユニットを取り外している。しかし、課電状態となっている主母線断路器ユニットの容器内には高圧ガスが充填されているため、主母線断路器ユニットから分岐回線ユニットを取り外すと、その間に接続される絶縁スペーサに高いガス圧がかかっている状態となり作業に危険性を伴う。
【０００４】
そのため、従来技術では、予め容器内に母線導体を収納しただけの短絡母線ユニットを用意しておき、第１及び第２主母線の一方を停電させた状態で、停電させた主母線を構成する主母線断路器ユニットを短絡母線ユニットと入れ替える作業を行い、短絡母線ユニットを課電状態としたのち他方の主母線を停電させ、停電させた主母線を構成する主母線断路器ユニット内のガスを抜いてから、次いで分岐回線ユニットを主母線断路器ユニットから取り外すことにより作業の安全性を確保していた。
【０００５】
【発明が解決しようとする課題】
上記した従来の技術では、事故が生じたときにのみ使用する、容器内に母線導体を収納しただけの短絡母線ユニットを予め用意しておかなければならないため、その短絡母線ユニットの製作，保管場所の確保，事故発生現場への運搬作業などが必要であった。
【０００７】
本発明の目的は、電気所を停電させずに補修を行う際に、安全に短時間で、且つ低コストで分岐回線ユニットを主母線断路器ユニットから取外すことができるガス絶縁開閉装置の分岐回線ユニット取外し方法を提供するにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明のガス絶縁開閉装置の分岐回線ユニット取外し方法は、ほぼ平行に配置された第１及び第２主母線のそれぞれが中心部に配置される筒部分と、該筒部分から突出し、前記第１及び第２主母線のそれぞれの軸方向に対して直交する方向に分岐している第１及び第２主母線のそれぞれが中心部に配置される接続部分とから成り、それぞれの前記接続部分には、該接続部分の中心部に配置される前記分岐している第１及び第２主母線のそれぞれに接続している母線側断路器が配置され、かつ、前記筒部分及び接続部分内には絶縁ガスが充填されている第１及び第２主母線断路器ユニットと、該第１及び第２主母線断路器ユニットのそれぞれと絶縁スペーサを介して接続され、遮断器を含む機器を絶縁ガスが充填された容器内に収納している分岐回線ユニットとを備え、前記第１及び第２主母線断路器ユニットと分岐回線ユニットが絶縁スペーサを介して接続された状態で、前記第１及び第２主母線断路器ユニットのそれぞれが絶縁スペーサを介して複数軸方向に一列に配置されているガス絶縁開閉装置であって、
前記分岐回線ユニットのいずれかで事故が発生した際には、事故が発生した分岐回線ユニットと接続している前記第１及び第２主母線断路器ユニットのいずれか一方の主母線を停電させ、この停電させた主母線が配置されている前記主母線断路器ユニットの筒部分及び接続部分内の前記絶縁ガスを回収し、次いで前記絶縁ガスが回収された前記主母線断路器ユニットを軸方向に隣接する主母線断路器ユニットから取外すと共に、前記主母線断路器ユニットの接続部分に配置されている絶縁スペーサを前記分岐回線ユニットから取外し、この取外された前記主母線断路器ユニットを、内部にある主母線を中心として１８０°回転させて前記主母線断路器ユニットの接続部分を前記分岐回線ユニットとは反対側に位置させ、この状態で前記主母線断路器ユニットを軸方向に隣接する主母線断路器ユニットと再接続し、前記絶縁ガスが回収されていた前記主母線断路器ユニット内に絶縁ガスを所定の圧力まで充填し、その後に停電していた前記主母線に課電し、しかる後に停電させた前記主母線とは別の主母線を停電させ、この停電させた主母線が配置されている前記主母線断路器ユニットの筒部分及び接続部分内の絶縁ガスを回収し、この状態で前記主母線断路器ユニットの接続部分に配置されている絶縁スペーサを前記分岐回線ユニットから取外し、その後、前記分岐回線ユニットを主母線から取外すことを特徴とする。
【００１０】
【発明の実施の形態】
本発明の一実施例を、図１から図７により説明する。
【００１１】
本実施例のガス絶縁開閉装置は、図１に示すように、第１主母線１と第２主母線２とはほぼ平行に配置されており、この第１主母線１及び第２主母線２は、それぞれ第１主母線断路器ユニット２１ａ，２１ｂ，２１ｃ及び第２主母線断路器ユニット２２ａ，２２ｂ，２２ｃを介して分岐回線ユニット２３ａ，２３ｂ，
２３ｃに接続されて構成されている。これらの第１主母線断路器ユニット２１ａ，２１ｂ，２１ｃは第１及び第２主母線方向にそれぞれ絶縁スペーサ４４を介して並置されており、第２主母線断路器ユニット２２ａ，２２ｂ，２２ｃも同様に並置されている。主母線断路器ユニットは中心部に主母線が配置された筒部分とこの筒部分から突出した分岐回線ユニットとの接続部分が設けられている。第１主母線断路器ユニット２１ａ，２１ｂ，２１ｃには、それぞれ母線側断路器３１，３２が分岐回線ユニット２３ａ，２３ｂ，２３ｃとの接続側に設けられており、分岐回線ユニット２３ａ，２３ｂ，２３ｃとは絶縁スペーサ４１を介して接続されている。第２主母線断路器ユニット２２ａ，２２ｂ，２２ｃも同様な構成で分岐回線ユニット２３ａ，２３ｂ，２３ｃと絶縁スペーサ４２を介して接続されている。分岐回線ユニット２３ａ，２３ｂ，２３ｃ内には、遮断器５１，３つの接地開閉器６１，６２，６３，線路側断路器３３，計器用変圧器７１，ケーブルヘッド７３，避雷器７２が収納されており、第１主母線１及び第２主母線２は遮断器５１と接続され、遮断器５１の両側には接地開閉器６１，６２が設置されている。遮断器５１はさらに絶縁スペーサ４３を介して線路側断路器３３及びケーブルヘッド７３に接続され、線路側断路器３３とケーブルヘッド７３との間には接地開閉器６３及び計器用変圧器７１，避雷器７２が設置されている。ケーブルヘッド７３はさらに分岐回線８１に接続されている。
【００１２】
図２に示すように、第１主母線１は、分岐回線ユニット２３の側面の上方に設置され、第２主母線２は、第１主母線１の下方側に設置されている。第１主母線１，第２主母線２を収納する主母線断路器ユニット容器は、主母線方向両側に開口部を有し、それと直交する方向の一方の側に開口部が設けられており、それらの開口部にはそれぞれ絶縁スペーサ４１，４２，４４が取り付けられている。主母線断路器ユニット容器は、絶縁スペーサ４４が設けられている方向は円筒形状に形成され、その中央部に主母線が配置されている。又、絶縁スペーサ４１，
４２の方向は直方体形状に形成されている。このとき、絶縁スペーサ４１，４２側には、母線側断路器３１，３２が設けられた分、長く形成されている。主母線断路器ユニット容器と分岐回線ユニット容器とは絶縁スペーサ４１，４２を介して気密に接続されている。３相分の第１主母線１及び第２主母線２は縦方向に一列に配列されており、それぞれ母線側断路器３１，３２を介して絶縁スペーサ
４１，４２に設けられた導体部と接続されている。第１主母線１側導体部と第２主母線２側導体部は、縦方向に設けられた導体７４を介して、遮断器５１の下方側に接続されており、遮断器５１の上方で接地開閉器６２を介して絶縁スペーサ４３に設けられた導体部と接続されている。遮断器５１を収納した容器は直方体形状に形成されており、絶縁スペーサ４１，４２はその直方体の一面に取付けられている。この導体部はさらに、線路側断路器３３を介して下方に位置する避雷器７２，避雷器と並置されたケーブルヘッド７３，ケーブルヘッドの上方に設けられた計器用変圧器７１と接続されている。
【００１３】
本実施例では図１のように、上述した分岐回線ユニット容器３台を横方向に所定の間隔を空けて設置されている。
【００１４】
上記のような構成のガス絶縁開閉装置でいずれかの分岐回線ユニット内で事故が生じた場合には、事故が生じた分岐回線ユニット（本実施例では仮に２３ｂとする。）を第１及び第２主母線断路器ユニット２１，２２から取外して補修を行う必要がある。その際に、電気所全体が停電状態になるのを避けるために、第１及び第２主母線の少なくとも一方を課電状態に保ったままで、分岐回線ユニット２３を取外している。課電状態の主母線断路器ユニットの容器内には高圧ガスが充填されているため、そのまま取外し作業を行うと、第１及び第２主母線断路器ユニット２１，２２と分岐回線ユニット２３間に接続される絶縁スペーサ４１，４２に高いガス圧がかかっている状態での危険な取外し作業となる。これを避けるために、本実施例ではまず第１主母線１を停電させた後、この第１主母線１が収納されている第１主母線断路器ユニット２１ａ，２１ｂ，２１ｃの容器内、つまり、第１主母線断路器ユニットの筒部分及び接続部分内のＳＦ6 ガスを回収する。次いで補修対象となる分岐回線ユニット２３ｂに接続されている第１主母線断路器ユニット２１ｂを、この第１主母線断路器ユニット２１ｂと軸方向に隣接する第１主母線断路器ユニット21ａ，２１ｃから取外すと共に、第１主母線断路器ユニット２１ａ，２１ｃの接続部分に配置されている絶縁スペーサ４１を分岐回線ユニット２３ｂから取外し、この第１主母線断路器ユニット２１ｂを図３，図４に示すように軸線９１を中心として１８０度回転させ第１主母線断路器ユニット第１主母線断路器ユニット２１ｂの接続部分を分岐回線ユニット２３ｂとは反対側に位置させ、この状態で第１主母線断路器ユニット２１ｂを再び軸方向に隣接する第１主母線断路器ユニット２１ａ，２１ｃと接続する。その際、図５に示すように、絶縁スペーサ４１に設けられた導体に電界シールド１０１を取り付け、その上から蓋１０２をフランジ接続して被せ、分岐回線ユニット２３ｂの解放端にも蓋１０３をフランジ接続して被せる。このとき主母線断路器ユニットの容器が上述した形状に形成されているので、第１主母線断路器ユニット２１ｂと分岐回線ユニット２３ｂとの間に十分なスペースができるような寸法となっている。上述した第１主母線断路器ユニット２１ｂと軸方向に隣接する第１主母線断路器ユニット２１ａ，２１ｃとの再接続が行われた後、第１主母線断路器ユニット２１ａ，２１ｂ，２１ｃ内にＳＦ6 ガスを所定の圧力まで充填し、その後に停電していた第１主母線１に課電し、次に第２主母線２を停電させる。第２主母線２を停電させた後、第２主母線断路器ユニット２２ｂの容器内、つまり、第２主母線断路器ユニット２２ｂの筒部分及び接続部分内のＳＦ 6 ガスを回収して、この第２主母線断路器ユニット２２ｂの接続部分と分岐回線ユニット２３ｂとの間に設置された絶縁スペーサ４２にガス圧が作用しない状態にする。この状態において前記絶縁スペーサ４２を分岐回線ユニット２３ｂから取外し、その後、分岐回線ユニット２３ｂを主母線から取外して補修を行う。
【００１６】
【発明の効果】
以上のように、本発明によれば、電気所を停電させずに第１及び第２主母線から分岐回線ユニットを取外す際に、短絡母線ユニットを用いる代わりに主母線断路器ユニットを回転させて再接続することにより、主母線断路器ユニットを使用することができ、余分なコストや時間を削減する効果がある。
【図面の簡単な説明】
【図１】本発明の一実施例であるガス絶縁開閉装置を示す単線結線図。
【図２】本実施例のガス絶縁開閉装置の縦断面図。
【図３】図２のガス絶縁開閉装置を上方から見た断面図。
【図４】図２のガス絶縁開閉装置を左方から見た断面図。
【図５】主母線導体配置が直線配置の場合の本実施例を示す図。
【符号の説明】
１…第１主母線、２…第２主母線、２１…第１主母線断路器ユニット、２２…第２主母線断路器ユニット、２３…分岐回線ユニット、３１，３２…母線側断路器、３３…線路線側断路器、４１，４２，４３，４４…絶縁スペーサ、５１…遮断器、６１，６２，６３…接地開閉器、７１…計器用変圧器、７２…避雷器、７３…ケーブルヘッド、７４…導体、８１…分岐回線、９１，９２…軸線、１０１…電界シールド、１０２，１０３…蓋。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is gas relates to a branch line units removal methods insulated switchgear equipment, that in particular about the branch line units removal method of the preferred gas-insulated switchgear equipment in accident response.
[0002]
[Prior art]
As a conventional gas insulated switchgear installed in an electric substation such as a substation, as described in JP-A-61-185004, devices such as a circuit breaker are mounted on a first main bus and a second main bus. There is a double main bus structure in which a plurality of branch lines are connected via a bus. In this gas insulated switchgear, branch line units in which equipment such as a circuit breaker, a line-side disconnector, a grounding switch, and a lightning arrester are housed in a container are juxtaposed at a predetermined interval, and each of these branch line units is The first main bus disconnector unit forming the first main bus and the second main bus disconnector unit forming the second main bus are connected via an insulating spacer. The first main bus disconnector units are connected in series to form a first main bus, and the second main bus disconnector units are connected in series to form a second main bus.
[0003]
When an accident occurs in any of the branch line units in the gas insulated switchgear having the above configuration, the branch line unit in which the accident has occurred is removed from the first and second main bus disconnector units to perform repair. There is a need to do. At this time, the branch line unit is removed while at least one of the first and second main buses is kept in the power-supplying state in order to avoid a power outage of the entire electric power station. However, since the high-pressure gas is filled in the container of the main bus disconnector unit in the power-on state, when the branch line unit is removed from the main bus disconnector unit, a high voltage is applied to the insulating spacer connected therebetween. The gas pressure is applied and the work is dangerous.
[0004]
Therefore, in the related art, a short-circuit bus unit in which only a bus conductor is housed in a container is prepared in advance, and a power outage of the main bus is configured in a state where one of the first and second main buses is in a power outage. After replacing the main bus disconnector unit with the short-circuit bus unit, and setting the short-circuit bus unit to the power-on state, the other main bus is cut off, and the gas in the main bus disconnector unit that constitutes the main bus that has been cut off is discharged. After removal, the branch line unit is then removed from the main bus disconnector unit to ensure the safety of work.
[0005]
[Problems to be solved by the invention]
In the above-described conventional technique, a short-circuit bus unit only used to store the bus conductor in a container, which is used only when an accident occurs, must be prepared in advance. And transportation to the accident site.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a branch line of a gas insulated switchgear capable of safely and quickly removing a branch line unit from a main bus disconnector unit when performing repair without stopping a power station. there in that provides a unit removal method.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method for removing a branch line unit of a gas insulated switchgear of the present invention comprises a tubular portion in which first and second main buses arranged substantially in parallel are arranged at a central portion, A connecting portion protruding from the cylindrical portion and branching in a direction orthogonal to the respective axial directions of the first and second main buses, wherein each of the first and second main buses is disposed at a central portion; A bus-side disconnector that is connected to each of the branched first and second main buses disposed at the center of the connection portion, is disposed at each of the connection portions; A first and a second main bus disconnector unit filled with an insulating gas in the portion and the connection portion, and each of the first and the second main bus disconnector units is connected via an insulating spacer; The equipment containing the insulation gas is filled And a first and second main buses in a state in which the first and second main bus disconnector units and the branch line units are connected via an insulating spacer. A gas-insulated switchgear, wherein each of the disconnector units is arranged in a row in a plurality of axial directions via an insulating spacer,
When an accident occurs in any of the branch line units, the power of one of the first and second main bus disconnector units connected to the branch line unit in which the accident has occurred is cut off, Recover the insulating gas in the cylindrical portion and the connection portion of the main bus disconnector unit where the main bus with the power failure is arranged, and then move the main bus disconnector unit in which the insulating gas is recovered in the axial direction. Remove from the adjacent main bus disconnector unit, remove the insulating spacer arranged at the connection part of the main bus disconnector unit from the branch line unit, and remove the removed main bus disconnector unit inside. By rotating the main bus disconnector unit by 180 ° about a certain main bus, the connecting portion of the main bus disconnector unit is located on the opposite side to the branch line unit, and in this state, the main bus The disconnector unit is reconnected to the main bus disconnector unit adjacent in the axial direction, the main bus disconnector unit from which the insulating gas has been recovered is filled with insulating gas to a predetermined pressure, and then the power is cut off. Further, the main bus is subjected to a power supply, and then a main bus other than the main bus that has been subjected to the power failure is subjected to a power failure, and the cylinder part and the connection part of the main bus disconnector unit in which the main bus having the power failure is disposed. Recovering the insulating gas inside, and in this state, removing the insulating spacer arranged at the connection portion of the main bus disconnector unit from the branch line unit, and then removing the branch line unit from the main bus. I do.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention will be described with reference to FIGS.
[0011]
In the gas insulated switchgear of this embodiment, as shown in FIG. 1, a first main bus 1 and a second main bus 2 are arranged substantially in parallel, and the first main bus 1 and the second main bus 2 Are respectively connected to the branch line units 23a, 23b, 22c via the first main bus disconnector units 21a, 21b, 21c and the second main bus disconnector units 22a, 22b, 22c.
23c. These first main bus disconnector units 21a, 21b, 21c are juxtaposed in the first and second main bus directions via insulating spacers 44, respectively, and the second main bus disconnector units 22a, 22b, 22c are also the same. Are juxtaposed. The main bus disconnector unit is provided with a connecting portion between a tubular portion in which the main bus is disposed at the center and a branch line unit protruding from the tubular portion. In the first main bus disconnector units 21a, 21b, 21c, bus-side disconnectors 31, 32 are provided on the connection side with the branch line units 23a, 23b, 23c, respectively, and the branch line units 23a, 23b, 23c are provided. Are connected via an insulating spacer 41. The second main bus disconnector units 22a, 22b, 22c have the same configuration and are connected to the branch line units 23a, 23b, 23c via insulating spacers 42. In the branch line units 23a, 23b and 23c, a circuit breaker 51, three grounding switches 61, 62 and 63, a line side disconnector 33, an instrument transformer 71, a cable head 73, and a lightning arrester 72 are housed. The first main bus 1 and the second main bus 2 are connected to a circuit breaker 51, and ground switches 61 and 62 are provided on both sides of the circuit breaker 51. The circuit breaker 51 is further connected to the line-side disconnector 33 and the cable head 73 via an insulating spacer 43. Between the line-side disconnector 33 and the cable head 73, a grounding switch 63, an instrument transformer 71, an arrester 72 are installed. The cable head 73 is further connected to the branch line 81.
[0012]
As shown in FIG. 2, the first main bus 1 is installed above a side surface of the branch line unit 23, and the second main bus 2 is installed below the first main bus 1. The main bus disconnector unit container that stores the first main bus 1 and the second main bus 2 has an opening on both sides in the main bus direction, and an opening is provided on one side in a direction orthogonal to the main bus direction. Insulating spacers 41, 42, and 44 are attached to these openings, respectively. In the main bus disconnector unit container, the direction in which the insulating spacer 44 is provided is formed in a cylindrical shape, and the main bus is disposed at the center thereof. Also, the insulating spacer 41,
The direction of 42 is formed in a rectangular parallelepiped shape. At this time, on the insulating spacers 41 and 42 side, they are formed longer by the provision of the bus-side disconnectors 31 and 32. The main bus disconnector unit container and the branch line unit container are airtightly connected via insulating spacers 41 and 42. The first main bus 1 and the second main bus 2 for three phases are arranged in a line in the vertical direction, and are connected to conductors provided on the insulating spacers 41 and 42 via the bus-side disconnectors 31 and 32, respectively. Have been. The first main bus 1 side conductor portion and the second main bus 2 side conductor portion are connected to a lower side of the circuit breaker 51 via a conductor 74 provided in a vertical direction, and grounded above the circuit breaker 51. It is connected to a conductor provided on the insulating spacer 43 via a switch 62. The container accommodating the circuit breaker 51 is formed in a rectangular parallelepiped shape, and the insulating spacers 41 and 42 are attached to one surface of the rectangular parallelepiped. The conductor is further connected to a lightning arrester 72 located below, a cable head 73 juxtaposed with the lightning arrester, and an instrument transformer 71 provided above the cable head via a line-side disconnector 33.
[0013]
In this embodiment, as shown in FIG. 1, the three branch line unit containers described above are installed at predetermined intervals in the horizontal direction.
[0014]
When an accident occurs in any of the branch line units in the gas insulated switchgear configured as described above, the branch line unit in which the accident has occurred (referred to as 23b in the present embodiment) is the first and the second. It is necessary to remove the main bus disconnector units 21 and 22 for repair. At that time, the branch line unit 23 is removed while at least one of the first and second main buses is kept in the power-supplying state in order to avoid a power outage of the entire electric power station. Since the container of the main bus disconnector unit in the charged state is filled with high-pressure gas, if the removal operation is performed as it is, the first and second main bus disconnector units 21 and 22 and the branch line unit 23 This is a dangerous removal operation when high gas pressure is applied to the insulating spacers 41 and 42 to be connected. In order to avoid this, in the present embodiment, after the first main bus 1 is first powered down, the first main bus 1 is housed in the containers of the first main bus disconnector units 21a, 21b, 21c , that is, And recovering the SF 6 gas in the tube portion and the connection portion of the first main bus disconnector unit . Next, the first main bus disconnector unit 21b connected to the branch line unit 23b to be repaired is separated from the first main bus disconnector units 21a and 21c axially adjacent to the first main bus disconnector unit 21b. At the same time, the insulating spacer 41 disposed at the connection portion of the first main bus disconnector units 21a and 21c is removed from the branch line unit 23b, and the first main bus disconnector unit 21b is removed as shown in FIGS. The first main bus disconnector unit 21b is rotated 180 degrees around the axis 91 so that the connection portion of the first main bus disconnector unit 21b is located on the opposite side to the branch line unit 23b, and in this state, the first main bus disconnector The unit 21b is again connected to the first main bus disconnector units 21a and 21c adjacent in the axial direction . At this time, as shown in FIG. 5, the electric field shield 101 is attached to the conductor provided on the insulating spacer 41, and a lid 102 is flange-connected from above, and the lid 103 is also flanged on the open end of the branch line unit 23b. Connect and cover. At this time, since the container of the main bus disconnector unit is formed in the above-described shape, the dimensions are such that a sufficient space is formed between the first main bus disconnector unit 21b and the branch line unit 23b. I have. After the above-mentioned first main bus disconnector unit 21b and the first main bus disconnector units 21a, 21c adjacent in the axial direction are reconnected, the first main bus disconnector units 21a, 21b, 21c are inserted into the first main bus disconnector units 21a, 21b, 21c. The SF 6 gas is charged to a predetermined pressure, and thereafter, power is applied to the first main bus 1, which has been interrupted , and then the second main bus 2 is interrupted. After the power failure of the second main bus 2 , the SF 6 in the container of the second main bus disconnector unit 22b , that is, in the cylindrical portion and the connection portion of the second main bus disconnector unit 22b. The gas is recovered, the gas pressure in the insulating spacer 42 disposed between the connecting portion and the branch line units 23b of the second main bus bars disconnector unit 22b is in a state that does not act. Remove the insulating spacer 42 in this state from the branch line units 23b, then performs repair branch line units 23b is removed from the main bus.
[0016]
【The invention's effect】
As described above, according to the present invention, the main bus disconnector unit is rotated instead of using the short-circuit bus unit when removing the branch line unit from the first and second main buses without causing a power outage at the power station. By reconnecting, the main bus disconnector unit can be used, which has the effect of reducing extra cost and time.
[Brief description of the drawings]
FIG. 1 is a single-line diagram showing a gas-insulated switchgear according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the gas insulated switchgear of the embodiment.
FIG. 3 is a sectional view of the gas insulated switchgear of FIG. 2 as viewed from above.
FIG. 4 is a sectional view of the gas insulated switchgear of FIG. 2 as viewed from the left.
FIG. 5 is a diagram showing this embodiment when the main bus conductor arrangement is a linear arrangement.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... 1st main bus, 2 ... 2nd main bus, 21 ... 1st main bus disconnector unit, 22 ... 2nd main bus disconnector unit, 23 ... Branch line unit, 31, 32 ... Bus-side disconnector, 33 ... Line-side disconnectors, 41, 42, 43, 44 ... Insulating spacers, 51 ... Circuit breakers, 61, 62, 63 ... Grounding switches, 71 ... Instrument transformers, 72 ... Lightning arresters, 73 ... Cable heads, 74 ... conductor, 81 ... branch line, 91, 92 ... axis, 101 ... electric field shield, 102, 103 ... lid.

Claims (1)

ほぼ平行に配置された第１及び第２主母線のそれぞれが中心部に配置される筒部分と、該筒部分から突出し、前記第１及び第２主母線のそれぞれの軸方向に対して直交する方向に分岐している第１及び第２主母線のそれぞれが中心部に配置される接続部分とから成り、それぞれの前記接続部分には、該接続部分の中心部に配置される前記分岐している第１及び第２主母線のそれぞれに接続している母線側断路器が配置され、かつ、前記筒部分及び接続部分内には絶縁ガスが充填されている第１及び第２主母線断路器ユニットと、該第１及び第２主母線断路器ユニットのそれぞれと絶縁スペーサを介して接続され、遮断器を含む機器を絶縁ガスが充填された容器内に収納している分岐回線ユニットとを備え、前記第１及び第２主母線断路器ユニットと分岐回線ユニットが絶縁スペーサを介して接続された状態で、前記第１及び第２主母線断路器ユニットのそれぞれが絶縁スペーサを介して複数軸方向に一列に配置されているガス絶縁開閉装置であって、
前記分岐回線ユニットのいずれかで事故が発生した際には、事故が発生した分岐回線ユニットと接続している前記第１及び第２主母線断路器ユニットのいずれか一方の主母線を停電させ、この停電させた主母線が配置されている前記主母線断路器ユニットの筒部分及び接続部分内の前記絶縁ガスを回収し、次いで前記絶縁ガスが回収された前記主母線断路器ユニットを軸方向に隣接する主母線断路器ユニットから取外すと共に、前記主母線断路器ユニットの接続部分に配置されている絶縁スペーサを前記分岐回線ユニットから取外し、この取外された前記主母線断路器ユニットを、内部にある主母線を中心として１８０°回転させて前記主母線断路器ユニットの接続部分を前記分岐回線ユニットとは反対側に位置させ、この状態で前記主母線断路器ユニットを軸方向に隣接する主母線断路器ユニットと再接続し、前記絶縁ガスが回収されていた前記主母線断路器ユニット内に絶縁ガスを所定の圧力まで充填し、その後に停電していた前記主母線に課電し、しかる後に停電させた前記主母線とは別の主母線を停電させ、この停電させた主母線が配置されている前記主母線断路器ユニットの筒部分及び接続部分内の絶縁ガスを回収し、この状態で前記主母線断路器ユニットの接続部分に配置されている絶縁スペーサを前記分岐回線ユニットから取外し、その後、前記分岐回線ユニットを主母線から取外すことを特徴とするガス絶縁開閉装置の分岐回線ユニット取外し方法。Each of the first and second main buses arranged substantially in parallel is arranged at a central portion and projects from the cylindrical portion, and is orthogonal to the axial direction of each of the first and second main buses. The first and second main buses branching in the direction each comprise a connection portion disposed at a center portion, and each of the connection portions has the branch portion disposed at the center portion of the connection portion. First and second main bus disconnectors, each of which has a bus-side disconnector connected to each of the first and second main buses, and in which the cylindrical portion and the connection portion are filled with an insulating gas; And a branch line unit that is connected to each of the first and second main bus disconnector units via an insulating spacer and stores equipment including a circuit breaker in a container filled with insulating gas. , The first and second main bus disconnector units A gas insulated switchgear in which each of the first and second main bus disconnector units is arranged in a row in a plurality of axial directions via an insulating spacer in a state in which the branch line unit and the branch line unit are connected via an insulating spacer. And
When an accident occurs in any of the branch line units, the power of one of the first and second main bus disconnector units connected to the branch line unit in which the accident has occurred is cut off, Recover the insulating gas in the cylindrical portion and the connection portion of the main bus disconnector unit where the main bus with the power failure is arranged, and then move the main bus disconnector unit in which the insulating gas is recovered in the axial direction. Remove from the adjacent main bus disconnector unit, remove the insulating spacer arranged at the connection part of the main bus disconnector unit from the branch line unit, and remove the removed main bus disconnector unit inside. By rotating the main bus disconnector unit by 180 ° about a certain main bus, the connecting portion of the main bus disconnector unit is located on the opposite side to the branch line unit, and in this state, the main bus The disconnector unit is reconnected to the main bus disconnector unit adjacent in the axial direction, the main bus disconnector unit from which the insulating gas has been recovered is filled with insulating gas to a predetermined pressure, and then the power is cut off. Further, the main bus is subjected to a power supply, and then a main bus other than the main bus that has been subjected to the power failure is subjected to a power failure, and the cylinder part and the connection part of the main bus disconnector unit in which the main bus having the power failure is disposed. Recovering the insulating gas inside, and in this state, removing the insulating spacer arranged at the connection portion of the main bus disconnector unit from the branch line unit, and then removing the branch line unit from the main bus. To remove the branch line unit of the gas insulated switchgear.
JP32756797A 1997-11-28 1997-11-28 Gas insulated switchgear and method of replacing branch line unit thereof Expired - Fee Related JP3541657B2 (en)

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JP32756797A JP3541657B2 (en) 1997-11-28 1997-11-28 Gas insulated switchgear and method of replacing branch line unit thereof
TW087118142A TW407388B (en) 1997-11-28 1998-10-31 Gas insulated switch device and the replacement method of its branch circuit element
KR1019980051203A KR19990045635A (en) 1997-11-28 1998-11-27 Gas insulated switchgear and its branch line unit replacement method

Applications Claiming Priority (1)

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JP32756797A JP3541657B2 (en) 1997-11-28 1997-11-28 Gas insulated switchgear and method of replacing branch line unit thereof

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JPS58165613A (en) * 1982-03-25 1983-09-30 株式会社東芝 Gas insulated switching device
JPS61185004A (en) * 1985-02-07 1986-08-18 日新電機株式会社 Removal of circuit unit for gas insulated switchgear
JPH01177808A (en) * 1988-01-04 1989-07-14 Toshiba Corp Gas-insulated switchgear
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