JP6230356B2 - Vacuum breaker vacuum degree confirmation device and vacuum degree confirmation method thereof - Google Patents
Vacuum breaker vacuum degree confirmation device and vacuum degree confirmation method thereof Download PDFInfo
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この発明は、真空遮断器の真空度確認装置及びその真空度確認方法に関するものである。 The present invention relates to a vacuum degree confirmation device for a vacuum circuit breaker and a vacuum degree confirmation method thereof.
従来の真空遮断器は、高真空の優れた絶縁性能及び遮断性能により大電流の遮断を可能としている。又、ガス遮断器と異なり地球温暖化係数の高いＳＦ６ガスを使用しておらず環境低負荷であるため、真空遮断器の高電圧適用が進んできている。一方、真空遮断器の容器内の真空度が亀裂などで低下すると絶縁、遮断性能が維持できない。このため定期的なメンテナンスの際に真空度を確認することも行われている。
高圧クラスの真空遮断器における真空度チェックは、定期メンテナンス時に真空遮断器を高圧盤から引き出し、真空バルブ極間に電圧を印加して絶縁性能を確認し真空遮断器の真空度をチェックするのが一般的である。
The conventional vacuum circuit breaker is capable of interrupting a large current due to excellent insulation performance and interruption performance of high vacuum. Also, unlike gas breakers, SF 6 gas, which has a high global warming potential, is not used, and the environment is lightly loaded. Therefore, the application of high voltage vacuum breakers is progressing. On the other hand, if the degree of vacuum in the vacuum circuit breaker container decreases due to cracks or the like, the insulation and breaking performance cannot be maintained. For this reason, the degree of vacuum is also checked during regular maintenance.
The vacuum level check for high-pressure class vacuum circuit breakers is to pull out the vacuum circuit breaker from the high-pressure panel during regular maintenance, check the insulation performance by applying voltage across the vacuum valve poles, and check the vacuum level of the vacuum circuit breaker. It is common.
前述のとおり、高圧クラスの真空遮断器では、定期メンテナンス時の真空度チェックとして真空遮断器を高圧盤から引き出し、真空バルブ極間に電圧を印加して絶縁性能を確認する方法が一般的である。一方、特高以上のクラスの真空遮断器は、ＳＦ６ガスやドライエアなどを密封したガス絶縁開閉装置のように接地タンクに収納されている場合が多く、真空遮断器のみを引き出して電圧印加することは難しい。このため、電圧印加による真空度チェックを行うためには、電力ケーブルや架空送電線などを取り外して真空遮断器の真空バルブを含む主回路部に電圧印加する必要があるため、メンテナンス時間が長時間化する。又、真空バルブに亀裂が発生し、真空バルブ内がＳＦ６ガスやドライエアなどの他の絶縁媒体に置換されることにより、真空度チェックのための耐電圧試験に耐えるケースもあり得るということがＩＥＣ規格でも指摘されているため、真空バルブ内が、ＳＦ６ガスやドライエアなどの他の絶縁媒体に完全に置換された場合においても真空バルブ内の状態を確認する方法が求められる。 As described above, in the high-pressure class vacuum circuit breaker, the method of checking the insulation performance by pulling the vacuum circuit breaker from the high-pressure panel and applying voltage between the vacuum valve poles as a check of the degree of vacuum during regular maintenance is common. . On the other hand, a vacuum circuit breaker of an extra high or higher class is often housed in a grounded tank like a gas insulated switchgear in which SF 6 gas or dry air is sealed, and only the vacuum circuit breaker is pulled out to apply a voltage. It ’s difficult. For this reason, in order to check the degree of vacuum by applying voltage, it is necessary to remove the power cable or overhead transmission line and apply the voltage to the main circuit part including the vacuum valve of the vacuum circuit breaker. Turn into. In addition, there may be cases where the vacuum valve cracks and the vacuum valve is replaced with another insulating medium such as SF 6 gas or dry air to withstand a withstand voltage test for checking the degree of vacuum. Since it is pointed out in the IEC standard, there is a need for a method for checking the state of the vacuum valve even when the inside of the vacuum valve is completely replaced with another insulating medium such as SF 6 gas or dry air.
特許文献１の文献では、真空バルブ内の接点を操作する操作ロッドの歪量を歪ゲージで測定している。一般に、真空バルブ内部の真空と外部気体の圧力差のため、真空バルブの接点開極時には接点部に自閉力と呼ばれる、接点が閉極する方向の力が生じる。真空バルブの真空度が劣化すると、この自閉力が低下するため、前述した操作ロッドに生じる荷重が変化する。特許文献１では、歪ゲージによって、自閉力の変化を常時測定することで、真空度の劣化を常時監視している。
しかし、真空遮断器の操作ロッドは、多数回動作する部分であるため振動等でひずみゲージがはがれ落ちる場合もあり得る。又真空遮断器の操作ロッドには少なくとも数百Ｋｇ〜数千Ｋｇの衝撃荷重が多数回加わるため、操作ロッド自体は前記の多数回の衝撃荷重に耐える構造となっている。一方で真空度の劣化によって生じる自閉力の変化は、数Ｋｇ〜数十Ｋｇ程度である。操作ロッド自体は、衝撃荷重に耐える構造であるため数Ｋｇ〜数十Ｋｇ程度の荷重の変化では、ほとんど歪が発生しない可能性もあり得る。
In the document of Patent Document 1, the strain amount of an operating rod that operates a contact in a vacuum valve is measured with a strain gauge. In general, due to the pressure difference between the vacuum inside the vacuum valve and the external gas, when the contact of the vacuum valve is opened, a force in the direction of closing the contact, called a self-closing force, is generated at the contact. When the degree of vacuum of the vacuum valve is deteriorated, the self-closing force is reduced, so that the load generated on the operation rod changes. In Patent Document 1, deterioration of the degree of vacuum is constantly monitored by constantly measuring changes in the self-closing force with a strain gauge.
However, since the operating rod of the vacuum circuit breaker is a part that operates many times, the strain gauge may be peeled off due to vibration or the like. In addition, since the impact load of at least several hundred kilograms to several thousand kilograms is applied many times to the operation rod of the vacuum circuit breaker, the operation rod itself has a structure that can withstand the multiple impact loads. On the other hand, the change in the self-closing force caused by the deterioration of the degree of vacuum is about several kilograms to several tens kilograms. Since the operating rod itself has a structure capable of withstanding an impact load, there is a possibility that almost no distortion will occur when the load changes from several kilograms to several tens of kilograms.
又、特許文献２では、真空バルブの接点を駆動する軸とは別の部分に、真空バルブ内の真空状態を維持するようにベローズを介して接続された真空度検出用の軸が配置されている。真空バルブの真空度が健全な場合は、真空バルブ内外の圧力差によってベローズが圧縮しているが、真空度が劣化してくると、ベローズが伸長するため、ベローズに接続された前述の真空度検出用の軸が突出する。この軸が外部に設けた電気的な接点を押すことにより、前記接点信号を用いて真空バルブの真空度が劣化したことを外部から検出することが可能としている。
しかし、真空バルブの真空度を検出するために、新たなベローズを含む検出用の軸を取り付けているため、真空バルブ自体の気密箇所が増えることになり、製品としての信頼性を下げることになると共に、真空バルブのコスト増加させることとなる。
Moreover, in patent document 2, the axis | shaft for a vacuum degree detection connected through the bellows is arrange | positioned so that the vacuum state in a vacuum valve may be maintained in the part different from the axis | shaft which drives the contact of a vacuum valve. Yes. When the vacuum level of the vacuum valve is healthy, the bellows is compressed due to the pressure difference between the inside and outside of the vacuum valve. However, when the vacuum level deteriorates, the bellows expands. The detection shaft protrudes. When this shaft presses an electrical contact provided outside, it is possible to detect from the outside that the vacuum degree of the vacuum valve has deteriorated using the contact signal.
However, since a detection shaft including a new bellows is attached to detect the degree of vacuum of the vacuum valve, the number of airtight portions of the vacuum valve itself will increase, reducing the reliability of the product. At the same time, the cost of the vacuum valve is increased.
この発明に係る真空遮断器の真空度確認装置は、絶縁ガスの封入された密封容器、可動接点、及び固定接点を有し上記密封容器内に収納され接点開閉操作機構により開閉操作される真空バルブ、及び上記可動接点の可動接点軸を気密に貫通させた蛇腹状ベローズ体を備え、上記可動接点軸に連結された絶縁ロッドと、この絶縁ロッドを介し上記可動接点軸に内端部が連結され上記接点開閉操作機構により上記可動接点及び上記固定接点を開閉駆動する作動軸と、この作動軸に設けられ上記可動接点及び上記固定接点を開離方向に付勢する開放ばねとをそれぞれ連結配置し、上記作動軸の外端部には、上記作動軸の荷重を測定する荷重測定装置を着脱自在に設けると共にこの荷重測定装置には、上記作動軸に当接する押圧子と、この押圧子の上記作動軸への当接時に上記作動軸及び上記絶縁ロッドを上記可動接点及び上記固定接点の閉極方向に押し出す押圧機構とを設け、この押圧機構による押圧力で上記可動接点と上記固定接点間を正規の開極寸法から少なくとも０．１ｍｍ以上縮め、上記真空バルブの自閉力及び上記開放ばねの弾力により上記作動軸に生じている荷重を上記荷重測定装置に伝えることによって、上記作動軸に生じる荷重を測定し、上記荷重測定装置によって、真空遮断器の製作完了時に、上記荷重の初期測定値を記録保存し且つ真空遮断器のメンテナンス時に、上記初期測定値とメンテナンス時における測定値とを比較照合することによりメンテナンス時における上記真空バルブの真空度を検知確認することを特徴とするものである。 A vacuum degree confirmation device for a vacuum circuit breaker according to the present invention includes a sealed container filled with an insulating gas, a movable contact , and a fixed contact , and is housed in the sealed container and is opened and closed by a contact opening / closing operation mechanism. And a bellows-like bellows body hermetically penetrating the movable contact shaft of the movable contact, and an inner rod is connected to the movable contact shaft via the insulating rod connected to the movable contact shaft. An operating shaft that opens and closes the movable contact and the fixed contact by the contact opening / closing operation mechanism, and an open spring that is provided on the operating shaft and biases the movable contact and the fixed contact in the separating direction are connected to each other. , the outer end of the actuating shaft, in the load measuring device with detachably provided a load measuring device for measuring the load of the working shaft, and the pushing element abutting on said actuating shaft, on the pushing element There is provided a pressing mechanism that pushes the operating shaft and the insulating rod in the closing direction of the movable contact and the fixed contact when contacting the operating shaft, and between the movable contact and the fixed contact by the pressing force of the pressing mechanism. It is generated at the operating shaft by contracting at least 0.1 mm or more from the normal opening dimension and transmitting the load generated on the operating shaft by the self-closing force of the vacuum valve and the elasticity of the open spring to the load measuring device. Measure the load, and record the initial measurement value of the load when the vacuum circuit breaker is completed by the load measurement device, and compare the initial measurement value with the measured value during maintenance of the vacuum circuit breaker. By checking, the degree of vacuum of the vacuum valve at the time of maintenance is detected and confirmed.
この発明の真空度確認装置によれば、メンテナンス時、電力ケーブルや架空送電線などを取り外すことなく、荷重測定装置によって真空バルブの真空度の健全性を確認できると共に真空度チェックに要する時間を短縮でき、高電圧を扱わないため安全性も高い。又、真空バルブ内が、ＳＦ６ガスやドライエアなどの他の絶縁媒体に完全に置換された場合においても、真空バルブ内の状態を検知確認することができる。更に、荷重測定器として充電式の物を使用すれば、外部電源も必要としない効果がある。 According to the vacuum degree confirmation device of the present invention, the maintenance of the vacuum degree of the vacuum valve can be confirmed by the load measuring device and the time required for the vacuum degree check can be reduced without removing the power cable or the overhead power transmission line during maintenance. Yes, it is safe because it does not handle high voltages. Further, even when the inside of the vacuum valve is completely replaced with another insulating medium such as SF 6 gas or dry air, the state in the vacuum valve can be detected and confirmed. Further, if a rechargeable device is used as a load measuring device, there is an effect that an external power source is not required.
以下、図面に基づいて、この発明の各実施の形態を説明する。
なお、各図間において、同一符号は同一あるいは相当部分を示す。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.
実施の形態１．
図１〜４に基づいて、この発明の実施の形態１を説明する。
図１は、この発明の実施の形態１における各相個別駆動形式の真空遮断器の、真空度確認装置を模式的に示した説明図で、（ａ）は開極状態における真空バルブの真空度検知確認時の真空度確認装置の側面図、（ｂ）は閉極状態における真空遮断器の要部のみを示す側面図である。
図２は、図１（ａ）の真空遮断器の真空度確認装置において、真空度確認装置による真空バルブの真空度確認時の動作説明図で、可動接点軸すなわち可動接点が開極状態から０．１ｍｍ以上閉極側に移動した状態を示したものである。
Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is an explanatory view schematically showing a vacuum degree confirmation device of a vacuum circuit breaker of each phase individually driven type according to Embodiment 1 of the present invention, and (a) is a vacuum degree of a vacuum valve in an open state. The side view of the vacuum degree confirmation apparatus at the time of detection confirmation, (b) is a side view which shows only the principal part of the vacuum circuit breaker in a closing state.
FIG. 2 is an operation explanatory diagram when the vacuum degree of the vacuum valve is confirmed by the vacuum degree confirmation device in the vacuum degree confirmation device of the vacuum circuit breaker of FIG. This shows the state of moving to the closing side by 1 mm or more.
図１に示す真空遮断器の真空度確認装置は、真空バルブの真空度検知確認時に、例えば図１（ａ）、図２に示すように密封容器１に、後述するようにして取り付け使用される。
真空度確認装置を説明する前に、まず図１（ａ）によって、真空度確認装置の測定の対象となる真空遮断器の構成を説明する。
実施の形態１に係る真空遮断器は、絶縁ガスが封入された密封容器１、可動接点Ｓ１及び固定接点Ｓ２を有しこの密封容器１内に収納され、接点開閉操作機構６（操作機構は図示せず）により開閉操作される真空バルブ２、及び接点開閉操作機構６内を貫通する可動接点軸２ａ（可動接点Ｓ１の）を密封容器１へ気密に貫通させた蛇腹状ベローズ体３を備えている。
The vacuum circuit breaker confirmation device shown in FIG. 1 is attached to a sealed container 1 as shown in FIGS. 1 (a) and 2, for example, as shown in FIG. .
Before explaining the vacuum degree confirmation device, first, the configuration of the vacuum circuit breaker to be measured by the vacuum degree confirmation device will be described with reference to FIG.
The vacuum circuit breaker according to Embodiment 1 has a sealed container 1 in which an insulating gas is sealed, a movable contact S1, and a fixed contact S2, and is housed in the sealed container 1, and a contact opening / closing operation mechanism 6 (the operation mechanism is illustrated in FIG. And a bellows-like bellows body 3 in which the movable contact shaft 2a (of the movable contact S1) penetrating through the contact opening / closing operation mechanism 6 is hermetically penetrated into the sealed container 1. Yes.
可動接点軸２ａには、エポキシ樹脂などの棒状の絶縁ロッド４が連結され、更にこの可動接点軸２ａと絶縁ロッド４の同一軸線上に、第１駆動軸２ｂ、第１接圧ばね圧縮部２ｂ１、第２接圧ばね圧縮部２ｄ１、第２駆動軸２ｄ、可動軸６ａ、可動子６ｂ、開放ばね押さえ５ａなどが配置され、直線駆動のための作動軸を構成している。
なお、作動軸は、第１駆動軸２ｂ、第２駆動軸２ｄ、可動軸６ａなどの総称である。
そして、第１駆動軸２ｂと第２駆動軸２ｄ間は、ピンｐにより連結され、数ｍｍの可動範囲を有する連結部２ｃを形成している。
又、可動接点軸２ａと絶縁ロッド４とはネジ又はピンにより締結され、第２駆動軸２ｄと可動軸６ａとは、ネジ又はピンにより締結されている。
A rod-like insulating rod 4 such as an epoxy resin is connected to the movable contact shaft 2a, and further, on the same axis line of the movable contact shaft 2a and the insulating rod 4, a first drive shaft 2b and a first contact pressure spring compression portion 2b1. The second contact pressure spring compression portion 2d1, the second drive shaft 2d, the movable shaft 6a, the movable element 6b, the release spring retainer 5a, and the like are arranged to constitute an operation shaft for linear drive.
The operating shaft is a general term for the first drive shaft 2b, the second drive shaft 2d, the movable shaft 6a, and the like.
The first drive shaft 2b and the second drive shaft 2d are connected by a pin p to form a connecting portion 2c having a movable range of several mm.
The movable contact shaft 2a and the insulating rod 4 are fastened by screws or pins, and the second drive shaft 2d and the movable shaft 6a are fastened by screws or pins.
更に、第１駆動軸２ｂと第２駆動軸２ｄとの連結部２ｃには、接点閉極時に接点間に圧縮力を与えるための接圧ばね５１が設けられ、この接圧ばね５１は、第１駆動軸２ｂに設けた第１接圧ばね圧縮部２ｂ１と第２駆動軸２ｄに設けた第２接圧ばね圧縮部２ｄ１間に張架されている。
又、この接圧ばね５１は、接点の開極状態では、連結部２ｃの可動範囲内で最大高さまで伸びた状態となっていて、接点閉極時には、連結部２ｃの可動範囲内で最小高さまで圧縮した状態となる。なお、第１駆動軸２ｂと第１接圧ばね圧縮部２ｂ１、第２駆動軸２ｄと第２接圧ばね圧縮部２ｄ１は、それぞれ溶接又はボルト締結により一体となっている。
Furthermore, a contact pressure spring 51 is provided at the connecting portion 2c between the first drive shaft 2b and the second drive shaft 2d to apply a compressive force between the contacts when the contact is closed. It is stretched between a first contact pressure spring compression portion 2b1 provided on the first drive shaft 2b and a second contact pressure spring compression portion 2d1 provided on the second drive shaft 2d.
The contact pressure spring 51 extends to the maximum height within the movable range of the connecting portion 2c when the contact is open, and the minimum height within the movable range of the connecting portion 2c when the contact is closed. It will be in the compressed state. The first drive shaft 2b and the first contact pressure spring compression portion 2b1, and the second drive shaft 2d and the second contact pressure spring compression portion 2d1 are integrated by welding or bolt fastening, respectively.
なお、接圧ばね５１は、真空遮断器が投入状態において真空バルブ２に接圧を与えるものであるため、図１（ａ）や図２の開極状態では接圧は生じていない。
又接圧ばね５１は、接点開閉操作機構６の可動軸６ａに接続され、開放ばね５とも連結する構造となっている。
The contact pressure spring 51 applies contact pressure to the vacuum valve 2 when the vacuum circuit breaker is turned on, so that contact pressure is not generated in the open state of FIG. 1A or FIG.
The contact pressure spring 51 is connected to the movable shaft 6 a of the contact opening / closing operation mechanism 6 and is connected to the release spring 5.
可動子６ｂは、接点開閉操作機構６内において可動軸６ａの中間部にネジ又はピンにより締結され、後述するように接点の開極時に、接点開閉操作機構６の開極側のストッパー部６ｃに当接し、このストッパー部６ｃで可動軸６ａに発生している荷重を受けている。又、可動子６ｂは、接点の閉極時に、接点開閉操作機構６の閉極側に当接し、閉極側に取り付けられた永久磁石６１に吸着され接点の閉極状態を保持する。又、可動子６ｂは、電磁操作機構（図示せず）の電磁力によって駆動され、接点開閉の操作が行われる。 The movable element 6b is fastened to the intermediate portion of the movable shaft 6a in the contact opening / closing operation mechanism 6 with a screw or a pin, and is applied to a stopper portion 6c on the opening side of the contact opening / closing operation mechanism 6 when the contact is opened as will be described later. The stopper 6c receives a load generated on the movable shaft 6a. Further, when the contact is closed, the movable element 6b contacts the closing side of the contact opening / closing operation mechanism 6 and is attracted to the permanent magnet 61 attached to the closing side to keep the contact closed. Further, the mover 6b is driven by an electromagnetic force of an electromagnetic operation mechanism (not shown), and a contact opening / closing operation is performed.
開放ばね押さえ５ａは、可動軸６ａの外端部にネジ又はピンにより締結され、この開放ばね押さえ５ａとストッパー部６ｃ間には開放ばね５が張架されている。
この開放ばね５は、可動接点Ｓ１及び固定接点Ｓ２を開離方向に付勢するもので、接点開極時に最大高さとなり、接点閉極時は、開放ばね押さえ５ａによって圧縮される。
The release spring retainer 5a is fastened to the outer end of the movable shaft 6a with a screw or a pin, and the release spring 5 is stretched between the release spring retainer 5a and the stopper portion 6c.
The open spring 5 biases the movable contact S1 and the fixed contact S2 in the opening direction, and has a maximum height when the contact is opened, and is compressed by the open spring retainer 5a when the contact is closed.
上述のように、可動軸２ａから駆動軸６ａまでが同一直線上に配置されている場合は、もっともシンプルな構造であり、外部から測定する荷重は、後述するように真空バルブ２の自閉力と開放ばね５の力の単純な差となる。
又、この構成は、同一直線上でない場合にも応用は可能であり、例えば、可動接点軸２ａと駆動軸６ａが角度θを有して連結されている場合、外部から測定する荷重は、開放ばねの荷重のcosθ分と真空バルブ２の自閉力の差となる。
As described above, when the movable shaft 2a to the drive shaft 6a are arranged on the same straight line, the structure is the simplest, and the load measured from the outside is the self-closing force of the vacuum valve 2 as will be described later. And a simple difference in the force of the open spring 5.
In addition, this configuration can be applied even when it is not on the same straight line. For example, when the movable contact shaft 2a and the drive shaft 6a are connected with an angle θ, the load measured from the outside is released. This is the difference between the cos θ component of the spring load and the self-closing force of the vacuum valve 2.
次に、図１（ｂ）に基づいて接点の閉極状態を略説する。
接点開閉操作機構６により閉極操作が行われると、開放ばね５及び接圧ばね５１には、図１（ａ）の開極状態の時に比べて圧縮され可動軸６ａに生じる荷重が開極方向に生じている。このとき、可動子６ｂは、接点開閉操作機構６の閉極側に当接し、閉極側に取り付けられた永久磁石６１に吸着され閉極状態が保持される。なお、開極位置から閉極位置への移動、及び閉極位置から開極位置への移動は、図示しないコイルに通電した電磁力で行われる。
Next, the contact closing state will be briefly described with reference to FIG.
When the closing operation is performed by the contact opening / closing operation mechanism 6, the opening spring 5 and the contact pressure spring 51 are compressed compared with the opening state of FIG. Has occurred. At this time, the mover 6b is in contact with the closing side of the contact opening / closing operation mechanism 6, and is attracted to the permanent magnet 61 attached to the closing side to maintain the closed state. Note that the movement from the open position to the closed position and the movement from the closed position to the open position are performed by electromagnetic force applied to a coil (not shown).
次に、開放ばね５及び蛇腹状ベローズ体３によって付勢された可動軸６ａの荷重を測定する、真空度確認装置の本体である荷重測定装置７について説明する。
この荷重測定装置７は、可動軸６ａの外端部に、当接自在に設けられている。そして、この荷重測定装置７の先端棒部７ｂには、可動軸６ａの外端部に当接する押圧子、すなわち当接部７ａが設けられ、その反対側には、当接部７ａ（押圧子）を接点の閉極方向に押し出す押圧機構、すなわちねじ棒９が設けられている。このねじ棒９（押圧機構）は、固定用フレーム８のねじ孔８ａに螺入され外端部の把手部を回動操作することにより進退する。なお、固定用フレーム８は、図１（ａ）の丸枠Ａで示した箇所において、密封容器１に対し着脱可能に構成され、測定時にのみ密封容器１に取り付けられる。従って、荷重測定装置７は、真空遮断器（真空バルブ２）の真空度の測定時にのみ密封容器１に取り付けられるものである。なお、固定用フレーム８の密閉容器１に対する取り付けは、例えば、
例１:密閉容器１にネジ穴部を設けておき、固定用フレーム８とネジ締結する。
例２:密閉容器１にスタッド部を設けておき、固定用フレーム８とネジ締結する。
例３:密閉容器１と固定用フレーム８をクランプで挟み込んで取り付ける。
などの取り付け方法によって、実施される。
Next, the load measuring device 7 which is a main body of the vacuum degree confirmation device for measuring the load of the movable shaft 6a urged by the opening spring 5 and the bellows-like bellows body 3 will be described.
The load measuring device 7 is provided on the outer end portion of the movable shaft 6a so as to be able to come into contact therewith. The distal end rod portion 7b of the load measuring device 7 is provided with a pressing member that contacts the outer end portion of the movable shaft 6a, that is, the contacting portion 7a, and on the opposite side, a contacting portion 7a (pressing member). ) In the contact closing direction, that is, a screw rod 9 is provided. This screw rod 9 (pressing mechanism) is screwed into the screw hole 8a of the fixing frame 8 and moves forward and backward by rotating the handle portion of the outer end portion. Note that the fixing frame 8 is configured to be detachable from the sealed container 1 at a position indicated by a round frame A in FIG. 1A, and is attached to the sealed container 1 only at the time of measurement. Therefore, the load measuring device 7 is attached to the sealed container 1 only when measuring the degree of vacuum of the vacuum circuit breaker (vacuum valve 2). Note that the fixing frame 8 is attached to the sealed container 1 by, for example,
Example 1: A screw hole is provided in the sealed container 1, and the fixing frame 8 is screwed.
Example 2: A stud portion is provided in the sealed container 1 and the fixing frame 8 is screwed.
Example 3: The sealed container 1 and the fixing frame 8 are clamped and attached.
It is carried out by an attachment method such as
この荷重測定装置７は、真空遮断器の製作完了時に、荷重の初期測定値を記録保存し且つメンテナンス時に、初期測定値とメンテナンス時における測定値との比較照合によりメンテナンス時における真空バルブ２の真空度を検知確認するものである。なお、荷重測定装置７としては、例えばプッシュプルゲージなどの汎用品が使用可能である。なお又、メンテナンス器具は、荷重測定装置７、固定フレーム８、及びねじ棒９等によって構成されている。
The load measuring apparatus 7, during manufacture completion of the vacuum circuit breaker, the initial measurement value of the load at the time of recording saved and maintenance of the vacuum valve 2 at the time of maintenance by comparison and collation with the measurement definitive during initial measurement and maintenance This is to detect and confirm the degree of vacuum. As the load measuring device 7, a general-purpose product such as a push-pull gauge can be used. The maintenance instrument is composed of a load measuring device 7, a fixed frame 8, a screw rod 9, and the like.
次に、荷重測定装置７による真空バルブ２の真空度検知確認操作を詳述する。
荷重測定装置７は、真空遮断器の製作完了時又はメンテナンス時に、測定のため密封容器１にメンテナンス器具として取り付けられる。
図１に示すように可動接点Ｓ１及び固定接点Ｓ２の開極状態の時、真空バルブ２の可動接点軸２ａは、真空バルブ２の自閉力（真空バルブ内部の真空と外部気体の圧力差）により閉極方向（図の右方向Ｒ）に荷重Ｆ１を受けている。
この荷重Ｆ１は、真空バルブ２の蛇腹状ベローズ体３に生じる真空バルブ２内外の圧力差と、蛇腹状ベローズ体３のばね力によって生じる。
Next, the vacuum degree detection confirmation operation of the vacuum valve 2 by the load measuring device 7 will be described in detail.
The load measuring device 7 is attached to the sealed container 1 as a maintenance tool for measurement at the time of completion of production of the vacuum circuit breaker or at the time of maintenance.
As shown in FIG. 1, when the movable contact S1 and the fixed contact S2 are in the open state, the movable contact shaft 2a of the vacuum valve 2 has a self-closing force of the vacuum valve 2 (the pressure difference between the vacuum inside the vacuum valve and the external gas). receiving a load F 1 in the closing direction (the right direction R in the figure) by.
This load F 1 is generated by the pressure difference inside and outside the vacuum valve 2 generated in the bellows-shaped bellows body 3 of the vacuum valve 2 and the spring force of the bellows-shaped bellows body 3.
接点開閉操作機構６内部の可動子６ｂは、可動接点Ｓ１及び固定接点Ｓ２が開極状態であるため、接点開閉操作機構６のストッパー部６ｃに当接し接触した状態となっている。
図１（ａ）の開極状態において、可動軸６ａには、開放ばね５による開極方向への荷重（図の左方向Ｌ）と真空バルブ２の自閉力による荷重Ｆ１(図の右方向Ｒ)が生じているが、可動子６ｂが接点開閉操作機構６のストッパー部６ｃに接触しているため、可動軸６ａの荷重は、ストッパー部６ｃで受けている。このため、荷重測定装置７には、荷重は発生しない。
The movable element 6b in the contact opening / closing operation mechanism 6 is in contact with and in contact with the stopper portion 6c of the contact opening / closing operation mechanism 6 because the movable contact S1 and the fixed contact S2 are in an open state.
In the open state of FIG. 1A, the movable shaft 6a is loaded on the movable shaft 6a in the open direction by the open spring 5 (left direction L in the figure) and the load F 1 due to the self-closing force of the vacuum valve 2 (right in the figure). Although the direction R) occurs, since the movable element 6b is in contact with the stopper portion 6c of the contact opening / closing operation mechanism 6, the load of the movable shaft 6a is received by the stopper portion 6c. For this reason, no load is generated in the load measuring device 7.
図１（ａ）の状態から、ネジ棒９を時計方向に回転させることで、ネジ棒９が真空遮断器の閉極方向（図の右方向Ｒ）に直線駆動し、荷重測定装置７の当接部７ａを介して作動軸の一部である可動軸６ａを、真空遮断器の閉極方向（図の右方向Ｒ）に押し込む。
この結果、図２に示すように、開極状態から少なくとも０．１ｍｍ以上閉極方向に移動した状態となる。
このとき、可動子６ｂは、接点開閉操作機構のストッパー部６ｃに接触せず、少なくとも０．１ｍｍ以上の隙間６ｄを有しているため、可動軸６ａに生じている荷重は、荷重測定装置７に伝わるようになる。
このように、ネジ棒９による押圧力で可動接点Ｓ１、固定接点Ｓ２間を正規の開極寸法から少なくとも０．１ｍｍ以上縮め、真空バルブ２の自閉力及び開放ばね５の弾力により作動軸に生じている荷重を荷重測定装置に伝えることによって、後述のようにして作動軸に生じる荷重を測定し、メンテナンス時における真空バルブの真空度を検知確認する。
By rotating the screw rod 9 clockwise from the state of FIG. 1 (a), the screw rod 9 is linearly driven in the closing direction of the vacuum circuit breaker (right direction R in the figure), and the load measuring device 7 is applied. The movable shaft 6a, which is a part of the operating shaft, is pushed through the contact portion 7a in the closing direction (right direction R in the figure) of the vacuum circuit breaker.
As a result, as shown in FIG. 2, the electrode moves from the open state to the closing direction by at least 0.1 mm or more.
At this time, since the movable element 6b does not contact the stopper portion 6c of the contact opening / closing operation mechanism and has a gap 6d of at least 0.1 mm or more, the load generated on the movable shaft 6a is the load measuring device 7. Will come to you.
In this way, the movable contact S1 and the fixed contact S2 are contracted by at least 0.1 mm or more from the normal opening dimension by the pressing force of the screw rod 9, and the working shaft is made to operate by the self-closing force of the vacuum valve 2 and the elasticity of the opening spring 5. By transmitting the generated load to the load measuring device, the load generated on the operating shaft is measured as described later, and the degree of vacuum of the vacuum valve during maintenance is detected and confirmed.
健全時の真空バルブ２の自閉力が、Ｆ１Ｋｇ（図の右方向Ｒ)、開放ばね５の荷重がＦ２Ｋｇ(図の左方向Ｌ)とすると、真空バルブ２が健全な場合に荷重測定装置７で測定される荷重Ｆは、Ｆ２-Ｆ１Ｋｇとなる。
これに対し、真空バルブ２の真空度が劣化した場合は、自閉力が低下し、自閉力は０Ｋｇとなるため、荷重測定装置７で測定される荷重はＦ２Ｋｇとなる。
When the self-closing force of the vacuum valve 2 in a healthy state is F 1 Kg (right direction R in the figure) and the load of the release spring 5 is F 2 Kg (left direction L in the figure), the vacuum valve 2 is healthy. The load F measured by the load measuring device 7 is F 2 −F 1 Kg.
On the other hand, when the degree of vacuum of the vacuum valve 2 is deteriorated, the self-closing force is reduced and the self-closing force is 0 kg, so the load measured by the load measuring device 7 is F 2 kg.
次に真空バルブ２の自閉力による荷重Ｆ１、開放ばね５の荷重Ｆ２、及び荷重測定装置７で計測される荷重Ｆについて説明する。
真空バルブ２の自閉力（荷重Ｆ１）は、圧力差及び蛇腹状ベローズ体３の有効断面積Ｓ、長さ及び材質によってきまるばね定数Ｋに依存する。
蛇腹状ベローズ体３の有効断面積をＳ[ｍｍ２]、
ばね定数をＫ１[Ｎ／ｍｍ]とし、
開極状態における蛇腹状ベローズ体３の自然長からの縮量がＺ[ｍｍ]とする。
又、真空バルブ２の外部の圧力がＰ[ＭＰａ−ａｂｓ]、
真空バルブ内部の圧力をＶ[ＭＰａ−ａｂｓ]とすると、
真空バルブ２の自閉力Ｆ１は、下記（１）式で表される。
自閉力Ｆ１＝（Ｐ−Ｖ）＊Ｓ−Ｋ１＊Ｚ ・・・・（１）
Next, the load F 1 due to the self-closing force of the vacuum valve 2, the load F 2 of the release spring 5, and the load F measured by the load measuring device 7 will be described.
The self-closing force (load F 1 ) of the vacuum valve 2 depends on the spring constant K determined by the pressure difference and the effective sectional area S, length and material of the bellows-like bellows body 3.
The effective cross-sectional area of the bellows-shaped bellows body 3 is S [mm 2 ],
The spring constant is K 1 [N / mm],
The amount of contraction from the natural length of the bellows-shaped bellows body 3 in the open state is defined as Z [mm].
Further, the pressure outside the vacuum valve 2 is P [MPa-abs],
When the pressure inside the vacuum valve is V [MPa-abs],
Self closing force F 1 of the vacuum valve 2 is expressed by the following equation (1).
Self-closing force F 1 = (P−V) * S−K 1 * Z (1)
又、開放ばね５のばね定数をＫ２、
真空遮断器の開極状態における自然長からの縮量がＹ[ｍｍ]とすると、
開放ばねの荷重Ｆ２は、下記（２）式となる。
荷重Ｆ２＝Ｋ２＊Ｙ ・・・・・（２）
荷重測定装置７で計測される荷重Ｆは、下記（３）式で表される。
荷重Ｆ＝Ｆ２−Ｆ１＝Ｋ２＊Ｙ−{（Ｐ−Ｖ）＊Ｓ−Ｋ１＊Ｚ} ・・・（３）
The spring constant of the open spring 5 is K 2 ,
If the amount of contraction from the natural length in the open circuit state of the vacuum circuit breaker is Y [mm],
Load F 2 of the opening spring is a following equation (2).
Load F 2 = K 2 * Y (2)
The load F measured by the load measuring device 7 is expressed by the following equation (3).
Load F = F 2 −F 1 = K 2 * Y − {(P−V) * S−K 1 * Z} (3)
上記（２）式から真空バルブ２の真空度が劣化すると、真空バルブ内部の圧力Ｖが上昇するため、真空バルブ２の自閉力が低下し、Ｆ２−Ｆ１の値が真空バルブ健全時の値に対して増加することとなり、真空度の劣化を判断することが可能となる。 When the degree of vacuum of the vacuum valve 2 deteriorates from the above equation (2), the pressure V inside the vacuum valve increases, so the self-closing force of the vacuum valve 2 decreases, and the value of F 2 −F 1 is when the vacuum valve is healthy. It becomes possible to judge deterioration of the degree of vacuum.
図３は、真空度と自閉力の関係（真空バルブの、真空度に対する自閉力の変化）を示している。
自閉力は、真空バルブ２の蛇腹状べローズ体３の寸法に依存するため、図３上での自閉力の値は相対値[ａ．ｕ．]としている。
図３では、真空度の単位を[Ｐａ]で示しており、真空バルブ２が健全な場合の真空度は一般的に１０-４[Ｐａ]以下といわれている。
一方、大気圧Ｐは、１０５[Ｐａ]である。図３では真空バルブ２が２気圧の加圧気体中に置かれている場合を想定している。
FIG. 3 shows the relationship between the degree of vacuum and the self-closing force (change of the self-closing force of the vacuum valve with respect to the degree of vacuum).
Since the self-closing force depends on the size of the bellows-shaped bellows body 3 of the vacuum valve 2, the value of the self-closing force on FIG. u. It is said that.
In FIG. 3, the unit of the degree of vacuum is indicated by [Pa], and the degree of vacuum when the vacuum valve 2 is healthy is generally said to be 10 −4 [Pa] or less.
On the other hand, the atmospheric pressure P is 10 5 [Pa]. In FIG. 3, it is assumed that the vacuum valve 2 is placed in a pressurized gas of 2 atm.
真空バルブ２に亀裂が発生した場合、真空度の低下速度は亀裂の大きさに依存するが、最終的には真空バルブ２内は全て周囲の気体に置換する。つまり、真空バルブ２の周囲が大気圧（１０５[Ｐａ]）であれば、亀裂が発生した真空バルブ２の内部も大気圧（１０５[Ｐａ]）となる。
又、真空バルブ２の周囲が２気圧に加圧された気体（２＊１０５[Ｐａ]）であれば、亀裂が発生した真空バルブ２の内部も２気圧（２＊１０５[Ｐａ]）となる。
When a crack is generated in the vacuum valve 2, the rate of decrease in the degree of vacuum depends on the size of the crack, but eventually the entire vacuum valve 2 is replaced with the surrounding gas. That is, if the surroundings of the vacuum valve 2 are atmospheric pressure (10 5 [Pa]), the inside of the vacuum valve 2 where the crack has occurred is also atmospheric pressure (10 5 [Pa]).
Further, if the surroundings of the vacuum valve 2 are pressurized to 2 atm (2 * 10 5 [Pa]), the inside of the vacuum valve 2 where the crack has occurred is also 2 atm (2 * 10 5 [Pa]). It becomes.
図３の条件下では、真空バルブ２内が１０３〜１０４[Ｐａ]以上になったあたりから、自閉力に変化が見られるようになり、真空バルブ２内が大気圧(１０５[Ｐａ])以上では、自閉力に大きな変化が見られる。つまり、真空バルブ２内が１０３〜１０４[Ｐａ]以上の場合は、自閉力の変化に伴う荷重の変化から、真空バルブ２の真空度の健全性が確認可能である。
なお、真空度が１０-４〜１０３[Ｐａ]においても真空バルブは健全な状態ではなく、真空バルブとしては不良の状態である。
Under the conditions of FIG. 3, the self-closing force starts to change after the inside of the vacuum valve 2 becomes 10 3 to 10 4 [Pa] or more, and the inside of the vacuum valve 2 is atmospheric pressure (10 5 [10 [ Above Pa]), there is a significant change in the autistic force. That is, when the inside of the vacuum valve 2 is 10 3 to 10 4 [Pa] or more, the soundness of the degree of vacuum of the vacuum valve 2 can be confirmed from the change in the load accompanying the change in the self-closing force.
Even when the degree of vacuum is 10 −4 to 10 3 [Pa], the vacuum valve is not in a healthy state and is in a poor state as a vacuum valve.
真空度が１０-４〜１０３[Ｐａ]の範囲では、自閉力の変化がみられないため、荷重測定による方法では、真空バルブ２の健全性は確認できない。しかし、真空バルブ２に亀裂が発生した場合、元々１０-４[Ｐａ]以下であった圧力が上昇し、一旦は１０-４〜１０３[Ｐａ]になるが、一度亀裂が発生した真空バルブの真空漏れが途中で停止することはないため、真空バルブ内の真空度は、１０-４〜１０３[Ｐａ]の範囲を通過し、１０３[Ｐａ]以上となる。つまり、真空バルブ内の真空度が１０-４〜１０３[Ｐａ]である時間は非常に短いため、定期点検時に真空度の健全性をチェックする場合は、真空度が１０３[Ｐａ]以上である範囲で判定して、真空バルブの健全性を確認できれば、実使用上は十分である。 When the degree of vacuum is in the range of 10 −4 to 10 3 [Pa], no change in the self-closing force is observed, and therefore the soundness of the vacuum valve 2 cannot be confirmed by the method using load measurement. However, when a crack occurs in the vacuum valve 2, the pressure that was originally 10 −4 [Pa] or higher is increased to 10 −4 to 10 3 [Pa]. for vacuum leakage will not be stopped on the way, the degree of vacuum in the vacuum valve passes through the range of 10 -4 ~10 3 [Pa], a 10 3 [Pa] or more. That is, the time during which the degree of vacuum in the vacuum valve is 10 −4 to 10 3 [Pa] is very short. Therefore, when checking the soundness of the degree of vacuum during regular inspection, the degree of vacuum is 10 3 [Pa] or more. If it can be judged within a certain range and the soundness of the vacuum valve can be confirmed, it is sufficient for practical use.
図４は荷重測定装置７での測定結果の一例を示している。
真空バルブ２が健全な場合は、前述のとおり、開放ばね５の荷重Ｆ２と真空バルブ２の自閉力Ｆ１の差が測定されるのみであるが、図３に示したように、真空バルブ２内が１０３〜１０４[Ｐａ]以上になったあたりから自閉力が大きく低下するため、それに伴って荷重測定装置７の測定値が増加することを示している。
FIG. 4 shows an example of a measurement result obtained by the load measuring device 7.
If the vacuum valve 2 is healthy, as as described above, but only the difference of the self closing force F 1 of the load F 2 and the vacuum valve 2 open spring 5 is measured, as shown in FIG. 3, the vacuum This shows that the measured value of the load measuring device 7 increases with the decrease of the self-closing force when the inside of the valve 2 becomes 10 3 to 10 4 [Pa] or more.
真空遮断器製造完了時に、前記荷重測定を行った結果を初期測定値として記録しておき、メンテナンス時の荷重測定値と比較することで、真空バルブ２の真空度の健全性が確認可能となる。 When the manufacture of the vacuum circuit breaker is completed, the result of the load measurement is recorded as an initial measurement value, and compared with the load measurement value at the time of maintenance, the soundness of the vacuum degree of the vacuum valve 2 can be confirmed. .
この実施の形態１では、メンテナンス時に荷重測定装置７、ねじ棒９及びそれらを固定する固定用フレーム８等のメンテナンス器具を取り付けるのみで、測定が実施可能であるため真空チェックに要する時間を短縮できる。
又、固定用フレーム８、荷重測定装置７及びねじ棒９等のメンテナンス器具が１式あれば、複数台の真空遮断器のメンテナンスが行えるため、製品自体のコストを増加させない。
又、高電圧を扱わないため安全性も高い。荷重測定装置７として充電式の物を使用することで、外部電源も必要としないなどの利点がある。
In the first embodiment, the time required for the vacuum check can be shortened because the measurement can be performed only by attaching the load measuring device 7, the screw rod 9, and the maintenance tool such as the fixing frame 8 for fixing them at the time of maintenance. .
Further, if there is one set of maintenance tools such as the fixing frame 8, the load measuring device 7, and the screw rod 9, a plurality of vacuum circuit breakers can be maintained, so that the cost of the product itself is not increased.
In addition, safety is high because high voltage is not handled. By using a rechargeable type load measuring device 7, there is an advantage that an external power source is not required.
なお、真空バルブ２の真空度検知確認方法は、上述のとおり、固定接点Ｓ２及び可動接点Ｓ１を開極状態にした後に、荷重測定装置７の取り付けを行い、可動軸６ａの外端部に当接させ、ねじ棒９の回動操作により固定接点Ｓ２及び可動接点Ｓ１の閉極方向に少なくとも０．１ｍｍ以上機械的に押し、この押し込み操作で真空バルブ２の自閉力に起因する荷重の変化を前述の要領で測定し、測定された荷重の測定値を比較照合することにより真空バルブの真空度を検知確認し、真空バルブ２の真空度の健全性を判断する方法で実施される。 As described above, the vacuum degree detection method for the vacuum valve 2 is performed by attaching the load measuring device 7 after the fixed contact S2 and the movable contact S1 are in the open state, and contacting the outer end of the movable shaft 6a. When the screw rod 9 is rotated, the fixed contact S2 and the movable contact S1 are mechanically pushed in the closing direction by at least 0.1 mm, and the load changes due to the self-closing force of the vacuum valve 2 by this pushing operation. Is carried out by a method of detecting and confirming the degree of vacuum of the vacuum valve 2 by comparing and comparing the measured values of the measured load and judging the soundness of the degree of vacuum of the vacuum valve 2.
実施の形態２.
図５〜８に基づいて、この発明の実施の形態２を説明する。
実施の形態２に係る真空遮断器は、三相一括駆動方式の接点開閉操作機構１３を備えたもので、各相の作動軸、真空度確認装置とも実施の形態１と同じ構成であり、重複部分の説明は省略する。なお、作動軸は、可動接点軸２ａ、第１駆動軸２ｂ、可動ロッド１０などを総称したものである。
Embodiment 2.
A second embodiment of the present invention will be described with reference to FIGS.
The vacuum circuit breaker according to the second embodiment is provided with a contact opening / closing operation mechanism 13 of a three-phase collective drive system, and the operation shaft of each phase and the vacuum degree confirmation device have the same configuration as in the first embodiment. The description of the part is omitted. The operating shaft is a general term for the movable contact shaft 2a, the first drive shaft 2b, the movable rod 10, and the like.
図５は、真空遮断器を模式的に示した説明図で、三相一括駆動方式の接点開閉操作機構を備えた真空遮断器の平面図、図６は、図５に示した真空遮断器の閉極状態における要部のみを示した側面図、図７は、図５における真空遮断器を簡略化（特に接圧ばね５１の部分）して示した説明図で、（ａ）は開極状態における真空遮断器の側面図、（ｂ）は閉極状態における真空遮断器の側面図である。図８は、図７（ａ）の真空遮断器の真空度確認装置において、真空度確認装置による真空バルブの真空度確認時の動作説明図である。 FIG. 5 is an explanatory view schematically showing a vacuum circuit breaker, a plan view of a vacuum circuit breaker provided with a contact opening / closing operation mechanism of a three-phase collective drive system, and FIG. 6 of the vacuum circuit breaker shown in FIG. FIG. 7 is a side view showing only the main part in the closed state, FIG. 7 is an explanatory view showing the vacuum circuit breaker in FIG. 5 in a simplified manner (particularly the part of the contact pressure spring 51), and FIG. FIG. 2B is a side view of the vacuum circuit breaker in FIG. FIG. 8 is an operation explanatory diagram when the vacuum degree of the vacuum valve is confirmed by the vacuum degree confirmation device in the vacuum degree confirmation device of the vacuum circuit breaker of FIG.
図５、６において、真空バルブ２は、三相分が並設され、各相の真空バルブ２の第２駆動軸２ｄには、実施の形態１の可動軸６ａに相当する可動ロッド１０が連結されている。図７において、三相一括駆動方式の接点開閉操作機構１３は、力点部１１ｂと作用点部１１ｃとを有し支点１１ａで支持された三相軸１１を備えている。
三相軸１１には、接点開閉操作機構１３からの出力である操作口ッド１２が力点部１１ｂで連結され、接点開閉操作機構１３からの出力は、１本の操作口ッド１２によって、三相軸１１を介して各相の可動ロッド１０、第２駆動軸２ｄに分配される。
5 and 6, three phases of the vacuum valve 2 are arranged in parallel, and the movable rod 10 corresponding to the movable shaft 6 a of the first embodiment is connected to the second drive shaft 2 d of the vacuum valve 2 of each phase. Has been. In FIG. 7, the three-phase collective drive type contact opening / closing operation mechanism 13 includes a three-phase shaft 11 having a force point portion 11b and an action point portion 11c and supported by a fulcrum 11a.
The three-phase shaft 11 is connected to an operation port 12 which is an output from the contact opening / closing operation mechanism 13 by a power point portion 11b, and an output from the contact opening / closing operation mechanism 13 is Each phase is distributed to the movable rod 10 and the second drive shaft 2d via the three-phase shaft 11.
従って、操作ロッド１２が開極方向に動作すると、その駆動力は三相軸１１を介して三相の第２駆動軸２ｄに伝わるため、図７（ａ）のように三相とも開極する。
又、操作口ッド１２が閉極方向に動作すると、その駆動力は三相軸１１を介して三相の第２駆動軸２ｄに伝わるため、図７（ｂ）のように三相とも閉極する。なお、開極位置及び閉極位置における接圧ばね５１の動作は、実施の形態１の場合と同じである。
Therefore, when the operating rod 12 moves in the opening direction, the driving force is transmitted to the three-phase second driving shaft 2d via the three-phase shaft 11, so that the three phases are also opened as shown in FIG. .
When the operation port 12 moves in the closing direction, the driving force is transmitted to the three-phase second drive shaft 2d via the three-phase shaft 11, so that all three phases are closed as shown in FIG. 7B. To the extreme. The operation of the contact pressure spring 51 at the opening position and the closing position is the same as that in the first embodiment.
なお、操作口ッド１２は、実施の形態１の電磁操作機構による電磁力、又は、モーターにより投入ばね、開放ばねのばねを畜勢し、ばねのエネルギーで駆動するばね操作機構のばねの力によって駆動する。 The operation port 12 is an electromagnetic force generated by the electromagnetic operation mechanism according to the first embodiment, or a spring force of a spring operation mechanism that drives the spring of the closing spring and the release spring by a motor and is driven by the energy of the spring. Drive by.
実施の形態１の開放ばね５に相当する開放ばねは、図示しないが接点開閉操作機構１３の中に搭載されており、開放ばねの力により操作ロッド１２が駆動し、その力が三相軸１１に伝わる。
なお、実施の形態２での荷重測定の際は、延長ロッド１４と可動ロッド１０を連結(ネジ又はピンなどで連結)した後で、可動ロッド１０と三相軸１１の連結１１ｂを取り外すため、測定される荷重に対して、開放ばねは関係なくなる。
The open spring corresponding to the open spring 5 of the first embodiment is mounted in the contact opening / closing operation mechanism 13 (not shown), and the operating rod 12 is driven by the force of the open spring, and the force is applied to the three-phase shaft 11. It is transmitted to.
When measuring the load in the second embodiment, after connecting the extension rod 14 and the movable rod 10 (connected with a screw or a pin), the connection 11b between the movable rod 10 and the three-phase shaft 11 is removed. The open spring is irrelevant for the measured load.
次に三相一括駆動方式の接点開閉操作機構１３を備えた真空遮断器のメンテナンス（真空度の検知確認）について説明する。
図５に示した真空遮断器をメンテナンスする時は、図８に示すように真空度確認装置の取り付けを行う。
まず、固定用フレーム８、ねじ棒９及び荷重測定装置７などで構成されたメンテナンス器具を密封容器１に取り付ける。
次に、荷重測定装置７の先端棒部７ｂに、連結用ピン７ｃによって延長ロッド１４を連結させ、更に延長ロッド１４の端部を、真空バルブ２の作動軸の一部である可動ロッド１０の先端部に連結させる。
Next, maintenance (vacuum level detection confirmation) of the vacuum circuit breaker provided with the contact opening / closing operation mechanism 13 of the three-phase collective drive system will be described.
When maintaining the vacuum circuit breaker shown in FIG. 5, the vacuum degree confirmation device is attached as shown in FIG.
First, a maintenance instrument including the fixing frame 8, the screw rod 9, the load measuring device 7, and the like is attached to the sealed container 1.
Next, the extension rod 14 is connected to the distal end rod portion 7 b of the load measuring device 7 by the connecting pin 7 c, and the end portion of the extension rod 14 is connected to the movable rod 10 which is a part of the operating shaft of the vacuum valve 2. Connect to the tip.
延長ロッド１４と可動ロッド１０の連結後、可動ロッド１０と作用点部１１ｃとのピンによる連結を取り外し、荷重測定装置７が作動軸の同一軸線上に位置する状態にする。
なお、可動ロッド１０には、真空バルブ２の自閉力に起因する引張り荷重（図の右方向Ｒ）が生じているが、可動ロッド１０は、延長ロッド１４、荷重測定装置７、ねじ棒９及び固定用フレーム８によって支えられているため、自閉力によって真空バルブ２の接点が閉極することはない。
この時点で、実施の形態１で説明した要領で計測が行われ、荷重測定装置７には、真空バルブ２の自閉力に起因する引張り荷重（図の右方向Ｒ）が測定される。
After the extension rod 14 and the movable rod 10 are connected, the connection of the movable rod 10 and the action point portion 11c by the pin is removed, so that the load measuring device 7 is positioned on the same axis of the operating shaft.
The movable rod 10 has a tensile load (right direction R in the figure) due to the self-closing force of the vacuum valve 2, but the movable rod 10 has the extension rod 14, the load measuring device 7, and the screw rod 9. And since it is supported by the fixing frame 8, the contact of the vacuum valve 2 is not closed by the self-closing force.
At this time, measurement is performed in the manner described in the first embodiment, and the load measuring device 7 measures a tensile load (right direction R in the figure) resulting from the self-closing force of the vacuum valve 2.
真空バルブ２の自閉力に起因する荷重測定装置７の測定値は、図３に示すような特性となる。
真空遮断器の製造完了時に、前記荷重測定を行った結果を記録保存しておき、メンテナンス時の荷重測定値と比較することで、実施の形態１と同様に真空バルブ２の真空度の健全性を確認することが可能となる。
The measured value of the load measuring device 7 resulting from the self-closing force of the vacuum valve 2 has characteristics as shown in FIG.
When the manufacture of the vacuum circuit breaker is completed, the result of the load measurement is recorded and stored, and compared with the load measurement value at the time of maintenance, the soundness of the vacuum degree of the vacuum valve 2 as in the first embodiment. Can be confirmed.
なお、この発明は、その発明の範囲内において、各実施の形態を適宜、変形、省略することが可能である。 In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention.
１：密封容器、 ２：真空バルブ、 Ｓ１：可動接点、 Ｓ２：固定接点、
２ａ：可動接点Ｓ１の可動接点軸、 ２ｂ：第１駆動軸、 ２ｄ：第２駆動軸、
２ｂ１：第１接圧ばね圧縮部、 ２ｄ１：第２接圧ばね圧縮部、
２ｃ：連結部、 ３：蛇腹状ベローズ体、 ４：絶縁ロッド、 ５：開放ばね、
５ａ：開放ばね押さえ、 ５１：接圧ばね、 ６：接点開閉操作機構、
６ａ：可動軸、 ６ｂ：可動子、 ６ｃ：ストッパー部、 ６ｄ：隙間、
６１：永久磁石、 ７：荷重測定装置、 ７ａ：荷重測定装置の当接部、
７ｂ：荷重測定装置の先端棒部（押圧子）、 ７ｃ：連結用ピン
８：固定用フレーム、 ８ａ：ねじ孔、 ９：ねじ棒（押圧機構）、
５１：接圧ばね、 １０：可動ロッド、 １１：三相軸、
１１ａ：三相軸の支点部、
１１ｂ：三相軸と操作ロッド１２との連結部、
１１ｃ：三相軸と可動ロッド１０との連結部、
１２：操作ロッド、 １３：接点開閉操作機構、 １４：延長ロッド。
1: sealed container, 2: vacuum valve, S1: movable contact, S2: fixed contact,
2a: movable contact shaft of the movable contact S1, 2b: first drive shaft, 2d: second drive shaft,
2b1: 1st contact pressure spring compression part, 2d1: 2nd contact pressure spring compression part,
2c: connecting portion, 3: bellows-shaped bellows body, 4: insulating rod, 5: open spring,
5a: Opening spring retainer 51: Contact pressure spring 6: Contact opening / closing operation mechanism
6a: movable shaft, 6b: mover, 6c: stopper, 6d: gap,
61: Permanent magnet, 7: Load measuring device, 7a: Contact portion of load measuring device,
7b: Tip rod portion (pressor) of load measuring device, 7c: Connecting pin 8: Fixing frame, 8a: Screw hole, 9: Screw rod (pressing mechanism),
51: contact pressure spring, 10: movable rod, 11: three-phase shaft,
11a: the fulcrum part of the three-phase shaft,
11b: a connecting portion between the three-phase shaft and the operation rod 12,
11c: a connecting portion between the three-phase shaft and the movable rod 10,
12: Operation rod, 13: Contact opening / closing operation mechanism, 14: Extension rod.
Claims (5)
上記可動接点軸に連結された絶縁ロッドと、この絶縁ロッドを介し上記可動接点軸に内端部が連結され上記接点開閉操作機構により上記可動接点及び上記固定接点を開閉駆動する作動軸と、この作動軸に設けられ上記可動接点及び上記固定接点を開離方向に付勢する開放ばねとをそれぞれ連結配置し、上記作動軸の外端部には、上記作動軸の荷重を測定する荷重測定装置を着脱自在に設けると共にこの荷重測定装置には、上記作動軸に当接する押圧子と、この押圧子の上記作動軸への当接時に上記作動軸及び上記絶縁ロッドを上記可動接点及び上記固定接点の閉極方向に押し出す押圧機構とを設け、この押圧機構による押圧力で上記可動接点と上記固定接点間を正規の開極寸法から少なくとも０．１ｍｍ以上縮め、上記真空バルブの自閉力及び上記開放ばねの弾力により上記作動軸に生じている荷重を上記荷重測定装置に伝えることによって、上記作動軸に生じる荷重を測定し、上記荷重測定装置によって、真空遮断器の製作完了時に、上記荷重の初期測定値を記録保存し且つ真空遮断器のメンテナンス時に、上記初期測定値とメンテナンス時における測定値とを比較照合することによりメンテナンス時における上記真空バルブの真空度を検知確認することを特徴とする真空遮断器の真空度確認装置。 A sealed container filled with an insulating gas, a movable contact , and a fixed contact, which are housed in the sealed container and opened / closed by a contact opening / closing mechanism, and the movable contact shaft of the movable contact are hermetically penetrated. With an accordion bellows body,
An insulating rod connected to the movable contact shaft, an inner shaft connected to the movable contact shaft via the insulating rod, and an operating shaft for opening and closing the movable contact and the fixed contact by the contact opening / closing operation mechanism; A load measuring device for measuring the load of the operating shaft at the outer end of the operating shaft, wherein the movable contact and the open spring that biases the movable contact and the fixed contact in the opening direction are connected to each other. The load measuring device includes a pressing member that contacts the operating shaft, and the operating shaft and the insulating rod that are connected to the operating shaft when the pressing member contacts the operating shaft. A pressing mechanism that pushes out in the closing direction of the vacuum valve, and the pressing force by the pressing mechanism reduces the distance between the movable contact and the fixed contact by at least 0.1 mm from the normal opening dimension, thereby increasing the self-closing force and the vacuum valve. By transmitting the load occurring on the actuating shaft by the elastic force of the opening spring to the load measuring device to measure the load generated in the actuating shaft, by the load measuring device, during fabrication the completion of the vacuum circuit breaker, the load The initial measured value is recorded and stored, and the vacuum degree of the vacuum valve at the time of maintenance is detected and confirmed by comparing and comparing the initial measured value and the measured value at the time of maintenance of the vacuum circuit breaker. A device for checking the degree of vacuum of a vacuum circuit breaker.
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