JPH02201836A - Magnetic driving type electrode for vacuum interrupter - Google Patents
Magnetic driving type electrode for vacuum interrupterInfo
- Publication number
- JPH02201836A JPH02201836A JP1961089A JP1961089A JPH02201836A JP H02201836 A JPH02201836 A JP H02201836A JP 1961089 A JP1961089 A JP 1961089A JP 1961089 A JP1961089 A JP 1961089A JP H02201836 A JPH02201836 A JP H02201836A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- contact surface
- arc
- electrode
- outer diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 238000009792 diffusion process Methods 0.000 abstract description 7
- 239000000306 component Substances 0.000 abstract 2
- 239000010949 copper Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011651 chromium Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
- H01H33/6643—Contacts; Arc-extinguishing means, e.g. arcing rings having disc-shaped contacts subdivided in petal-like segments, e.g. by helical grooves
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ 産業上の利用分野
本発明は、アークを磁気回転駆動してしゃ断する真空イ
ンタラプタ用磁気駆動型電極に関する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a magnetically driven electrode for a vacuum interrupter that interrupts an arc by magnetic rotational driving.
Ｂ 発明の概要
本発明は、真空インクラブタ用磁気駆動型電極において
、接触面の外径をリード棒の直径以下にすると共に、接
触面の半径を前記接触部自体の半径より１ ｍｍ以上小
さくして、少なくとも通電時において、接触面とり一ド
棒との間に形成される電流路におけろ電流成分のうち、
接触面に直交する方向の電流成分を接触面に平行なもの
より大きくし、もってしゃ断時の金属蒸気によるアーク
の自己拡散力によってアークを接触部からアーク部へ移
動し、アーク部においてアークを回転移動させてしゃ断
するようにしたものである。B. Summary of the Invention The present invention provides a magnetically driven electrode for a vacuum incretor, in which the outer diameter of the contact surface is made equal to or less than the diameter of the lead rod, and the radius of the contact surface is made smaller than the radius of the contact portion itself by 1 mm or more. , at least when energized, among the current components in the current path formed between the contact surface and the rod,
By making the current component in the direction perpendicular to the contact surface larger than that parallel to the contact surface, the arc is moved from the contact part to the arc part by the self-diffusion force of the arc due to metal vapor at the time of interruption, and the arc is rotated in the arc part. It was designed to be moved and cut off.
Ｃ従来の技術
一般に、真空インタラプタは、第１０図に示すように、
真空容器１内に、固定電極２を有する固定リード棒３と
、可動電極４を有し上下動可能な可動リード棒５とを内
装して構成される。図中、６は可動リード棒５を可動と
しているベローズ、７は真空容器１内周をおおっている
シールドである。C. Prior Art In general, a vacuum interrupter has the following structure as shown in FIG.
A vacuum container 1 is configured to house a fixed lead rod 3 having a fixed electrode 2 and a movable lead rod 5 having a movable electrode 4 and movable up and down. In the figure, 6 is a bellows that makes the movable lead rod 5 movable, and 7 is a shield that covers the inner circumference of the vacuum container 1.
このような真空インタラプタの電極２，４には、大電流
しゃ断簡力特性、低さい断電流値特性、高耐電圧値特性
など腫々の電気的特性が要求される。The electrodes 2 and 4 of such a vacuum interrupter are required to have various electrical characteristics such as large current breaking characteristics, low breaking current value characteristics, and high withstand voltage value characteristics.
しかしながら、これらの諸特性は相反する性質のもので
あるので、すべてを同時に達成することは難しい。した
がって、従来より、真空インタラプタの用途に応じてい
ずれかの特性を重視して電極材料を選択したり、特殊な
電極構造を採用したりしている。However, since these characteristics are contradictory, it is difficult to achieve all of them at the same time. Therefore, conventionally, electrode materials have been selected with emphasis on one of the characteristics, or a special electrode structure has been adopted, depending on the purpose of the vacuum interrupter.
このような状況のもと、同じ電極径でより電流しゃ断性
能を向上させるための代表例として、磁気駆動型の電極
が知られている。Under these circumstances, magnetically driven electrodes are known as a representative example of improving current cutting performance with the same electrode diameter.
磁気駆動型の電極の一例を第７図、第８図に示す。図に
示すように、この電極８は、複数のスパイラル溝９を備
えたアーク部１０の一方の面側中央部に接触部１１を設
け、アーク部１０の他方の面側にリード棒１２を接続す
る構造となっており、磁気駆動力によりアークを外周方
向に駆動し、電極の極部的な加熱を防止することによっ
て、しゃ断限界の増大を図るものである。An example of a magnetically driven electrode is shown in FIGS. 7 and 8. As shown in the figure, this electrode 8 has a contact portion 11 provided at the center of one side of an arc portion 10 having a plurality of spiral grooves 9, and a lead rod 12 connected to the other side of the arc portion 10. The structure is designed to increase the cutoff limit by driving the arc in the outer circumferential direction using magnetic driving force and preventing local heating of the electrode.
しかして、この電極８は、アークを回転させることを目
ざしたものであるから、発生したアークが停滞すること
なく、電流ゼロ点をむかえるまで動いているように種々
の試みがなされている。Since the electrode 8 is intended to rotate the arc, various attempts have been made to ensure that the generated arc does not stagnate and continues to move until the current reaches zero point.
つまり、アーク１３は、第７図中の■で発生した後、ア
ークペダル１０ａ上を■、■。That is, after the arc 13 occurs at ■ in FIG. 7, it moves over the arc pedal 10a at ■ and ■.
■のように移動する。この際に、アーク１３は、次々に
発生するアークを集めてアーク柱１３′となって回転す
ることになる。■Move as shown. At this time, the arc 13 collects the arcs generated one after another and rotates to form an arc column 13'.
アーク１３の駆動力となるのは、第８図における、電極
８の半径方向に生じる電流１ｈの成分に基因する電極部
に生じろコ字状の電流路による磁気力Ｆである。The driving force for the arc 13 is the magnetic force F caused by the U-shaped current path generated in the electrode portion due to the component of the current 1h generated in the radial direction of the electrode 8 in FIG.
したがって、従来は、
■ 磁気力Ｆが大きく生じろように、
ａ： リード棒１２の直径に比較して接触部１１の内径
を大きくする、
ｂ： リード棒１２の上部に高抵抗材料（ＳＵＳ鋼）か
らなるいわゆるブローアウトリング１４を設けろ、
Ｃ：スパイラル溝９の内端部を第７図中９ａで示す如く
接触部１１の下まで伸ばしてアークペダル１０ａを長く
する、
といった手段をとっており、また、
■ アークの回転移動のために、
ａ；アークペダル１０ａの先端を第７図中１０ｂで示す
ように長くして、アークが隣接ペダルに移動しやすくす
る、
ｂ：周辺のアークシールドとの間隙寸法を考慮する、
といった手段をとっている。Therefore, in the past, in order to generate a large magnetic force F, a: the inner diameter of the contact part 11 was made larger than the diameter of the lead rod 12; b: a high-resistance material (SUS steel C: The inner end of the spiral groove 9 extends below the contact portion 11 as shown by 9a in FIG. 7 to lengthen the arc pedal 10a. , Also, ■ For the rotational movement of the arc, a: The tip of the arc pedal 10a is lengthened as shown by 10b in Fig. 7 to make it easier for the arc to move to the adjacent pedal.b: The surrounding arc shield and Measures are taken to consider the gap size.
Ｄ、 発明が解決しようとする課題
上記のような手段をとる従来の電極における思想は、発
生したアーク１３にすばやくいわゆるコ字力による磁気
駆動力を作用させるようにしたものである。したがって
、アーク１３の動きは、前述したように一点で発生した
アーク１３が成長し、次々に発生したアークを集めて大
きなアーク柱１３′となって回転する如くなる。D. Problems to be Solved by the Invention The idea behind conventional electrodes that take the above-described measures is to quickly apply a magnetic driving force by a so-called U-shaped force to the generated arc 13. Therefore, the movement of the arc 13 is such that the arc 13 generated at one point grows as described above, and the arcs generated one after another are collected to form a large arc column 13' and rotate.
しかし、アークが回転するといっても、アークには電極
外周方向に向かう磁気駆動力が作用していることから、
アークの回転移動は電極表面の一部のみで終了してしま
い、電極全表面が有効に利用されない。However, even though the arc rotates, there is a magnetic driving force acting on the arc toward the outer circumference of the electrode.
The rotational movement of the arc ends only on a portion of the electrode surface, and the entire electrode surface is not effectively utilized.
したがって、電極径に見合ったしゃ断性能が得られず、
また、前述のように、■スパイラル溝９を長くする、■
アークペダル１０を長くする、■ブローアウトリング１
４を設ける等の手段をとっても性能の向上には限界があ
り、待に■、■の手段では、耐久性が低下するという別
の問題が発生してしまう。Therefore, breaking performance commensurate with the electrode diameter cannot be obtained,
In addition, as mentioned above, ■ lengthening the spiral groove 9, ■
Lengthen the arc pedal 10, ■Blowout ring 1
Even if measures such as providing 4 are taken, there is a limit to the improvement in performance, and measures ① and ③ cause another problem of reduced durability.
第９図には従来の電極における電極径と電流しゃ断性能
との関係を示しである。図には、併せて縦磁界印加型の
電極につい゛ても示しである。図かられかるように、磁
気駆動型の電極では、電極径がある寸法以上になると、
しゃ断性能の向上は望めない。FIG. 9 shows the relationship between the electrode diameter and current cutoff performance in a conventional electrode. The figure also shows a vertical magnetic field application type electrode. As can be seen from the figure, in magnetically driven electrodes, when the electrode diameter exceeds a certain size,
No improvement in cutting performance can be expected.
また、特に、しゃ断電流が５０ｋＡ以上になると、アー
クエネルギが大きくなるため、磁気駆動力のみではアー
クの局所的集中が防止できず、電極径が１１０〜１２〇
−以上ではほとんどしゃ断性能は上がらない。In addition, especially when the breaking current exceeds 50 kA, the arc energy becomes large, so magnetic driving force alone cannot prevent local concentration of the arc, and when the electrode diameter is 110 to 120 mm or more, the breaking performance hardly improves. .
さらに、定格電圧が１２ｋＶ程度の真空インタラプタに
おいては、外部配線との距離（第１０図中にｒＬＪで示
す）は２５０〜３５０關程度であ秒、電磁力の値は約２
０ Ｇａｕｓｓ／ ｋ Ａ−ｍ （磁束密度／電流・ア
ーク長）、磁気駆動力Ｆは１０ ｇ ｆ ／ ｋ Ａ−
ｍｍ程度であるため、特にアークがアークペダル１０ａ
の外周付近（第７図に示した■の位置）に位置する場合
には、円周方向へアークが移動しにくくなり、しゃ断性
能が低下する。Furthermore, in a vacuum interrupter with a rated voltage of about 12 kV, the distance from the external wiring (indicated by rLJ in Figure 10) is about 250 to 350 seconds, and the electromagnetic force is about 2
0 Gauss/k A-m (magnetic flux density/current/arc length), magnetic driving force F is 10 g f/k A-
Since the arc is about mm, especially when the arc is
If the arc is located near the outer periphery (the position marked with ■ in FIG. 7), it becomes difficult for the arc to move in the circumferential direction, and the breaking performance deteriorates.
上記のように、外方向の磁気駆動力によるしゃ断性能の
向上には限界があったので、本件発明者らは原点に帰り
、しゃ断時に発生する金属蒸気の自己拡散力にて発生し
たアークを接触部からアーク部に移動させることができ
ないか試みた。As mentioned above, there was a limit to the improvement of the breaking performance due to the outward magnetic driving force, so the inventors of the present invention returned to the starting point and decided to contact the arc generated by the self-diffusion force of the metal vapor generated during the breaking. I tried to see if it was possible to move it from the section to the arc section.
すなわち、外方向の磁気駆動力が極力小さくなるように
電極を構成してみたのである。In other words, the electrodes were constructed so that the outward magnetic driving force was as small as possible.
具体的には、接触面の外径をリード棒の直径以下にする
と共に、接触面の外径を接触部自体の外径より小さくし
、リード棒と接触面との間の電流路が、接触面に直交す
るもの（第１１図中ので示す）が大半となるようにして
、接触面と平行となる方向の成分（第１１図中Ｏで示す
）が極力少なくなるように配慮したのである。Specifically, the outer diameter of the contact surface is made equal to or less than the diameter of the lead rod, and the outer diameter of the contact surface is made smaller than the outer diameter of the contact part itself, so that the current path between the lead rod and the contact surface is The majority of the components were perpendicular to the contact surface (indicated by O in FIG. 11), and care was taken to minimize the component in the direction parallel to the contact surface (indicated by O in FIG. 11).
この電極を用いて真空インタラプタを組み立てて、その
しゃ断性能を試験したところ、電流しゃ断性能が１０〜
３０％向上する結果が得られた。しかも、試験後のもの
を分解して電極表面を観察したところ、局部的なエロー
ジョンはなく、電極表面はぼ全体にアークの痕跡が見ら
れた（従来のものでは、局部的な二ロージンンであった
） これから、電極表面全体が有効利用されているこ
とが判った。When a vacuum interrupter was assembled using this electrode and its interrupting performance was tested, the current interrupting performance was 10~10.
A result of 30% improvement was obtained. Moreover, when we disassembled the product after the test and observed the electrode surface, we found that there was no local erosion, and traces of arcing were seen on almost the entire electrode surface (in contrast to the localized two erosions in the conventional product). ) From this, it was found that the entire electrode surface was effectively utilized.
また、真空インタラプタのシールド内壁面のよごれ、パ
リの発生も少なかった。これ（よ、しゃ断後の耐圧低下
防止が図れ、その結果、大電流しゃ断回敞の増加が期待
できろことを示している。In addition, there was less dirt and debris on the inner wall of the vacuum interrupter shield. This shows that it is possible to prevent a drop in withstand voltage after a shutdown, and as a result, we can expect an increase in the recovery performance after a large current shutdown.
したがって、発生したアークを従来の如く強制的に外方
向向きの磁気力によって駆動させるのではなく、自然発
生の自己拡散力によってアークを接触部からアーク部に
移動させろことにより、良好な結果が得られることが判
った。Therefore, better results can be obtained by moving the arc from the contact part to the arc part by the naturally occurring self-diffusion force, instead of forcing the generated arc to be driven by an outward magnetic force as in the past. It turned out that it was possible.
しかしながら、このように接触部からアーク部へアーク
を移動させることにより、電極の品質安定化を図っても
、閉極時において電極間に接触抵抗のばらつきがあると
、抵抗の増加した部分で発熱等の問題を引き起こすばか
りでなく、アーク発生の集中、片寄り等の問題を惹起し
、性能の安定性を害してしまう。However, even if the quality of the electrode is stabilized by moving the arc from the contact part to the arc part in this way, if there is variation in contact resistance between the electrodes when the contact is closed, heat will be generated in the part where the resistance increases. This not only causes problems such as the above, but also causes problems such as concentration and unevenness of arc generation, which impairs the stability of performance.
接触抵抗にばらつきを生じさせろ原因としては、一方の
電極の接触部が他方の電極のアーク部とも接触してしま
うことがあげられろ。One of the causes of variation in contact resistance is that the contact portion of one electrode also comes into contact with the arc portion of the other electrode.
これは、アーク部に対する接触部のズレ、電極同士の片
当りなどに起因する。This is caused by misalignment of the contact portion with respect to the arc portion, uneven contact between the electrodes, and the like.
そこで、電極同士の片当りや接触部のズレがあっても接
触部がアーク部に接触しないようにするため、実際に接
触する接触面を接触部材自体の外径より小さくして試み
た。接触部材の外径と、この接触部材の外周からテーパ
を介して突出する接触面の外径との差を変丸で接触抵抗
のバラツキを調べた結果を第４図に示す。接触部材の外
径り、と接触面の外径Ｄ２との半径差ｌ（＝Ｌ丁２ ）
が１ｍ息上になると接触抵抗のバラツキは顕著に少なく
なろ。Therefore, in order to prevent the contact part from coming into contact with the arc part even if there is uneven contact between the electrodes or misalignment of the contact part, an attempt was made to make the contact surface that actually makes contact smaller than the outer diameter of the contact member itself. The difference between the outer diameter of the contact member and the outer diameter of the contact surface protruding from the outer periphery of the contact member via a taper is shown in FIG. 4 as a result of examining the variation in contact resistance. Radius difference l between the outer diameter of the contact member and the outer diameter D2 of the contact surface (=L2)
The variation in contact resistance decreases significantly when the height increases by 1 m.
Ｅ、 課題を解決するための手段
上記知見に基づき、本発明では、
複数のスパイラル溝を有するアーク部の一方の面の中央
部にリング状の接触面を具備する接触部を設け、他方の
面の中央部にリード棒を接続してなる真空インタラプタ
用磁気駆動型電極において、
前記接触面の外径を前記リード棒の直径以下にすると共
に、前記接触面の半径を前記接触部材自体の半径より１
陳以上小さくして、少な（とも通電時において前記接触
面と前記リード棒との間に形成される電流路における電
流成分を、接触面に直交する方向の成分をｒｖ、接触面
に平行する方向の成分をＩｈとしたとき、Ｔｖ＞ｉｈと
なるようにしたのである。E. Means for Solving the Problems Based on the above findings, the present invention provides a contact portion having a ring-shaped contact surface in the center of one surface of an arc portion having a plurality of spiral grooves, and a contact portion having a ring-shaped contact surface on the other surface. In a magnetically driven electrode for a vacuum interrupter in which a lead rod is connected to the center of the electrode, the outer diameter of the contact surface is set to be equal to or less than the diameter of the lead rod, and the radius of the contact surface is set to be smaller than the radius of the contact member itself. 1
The current component in the current path formed between the contact surface and the lead rod when energized is smaller than that, rv is the component in the direction perpendicular to the contact surface, and rv is the component in the direction parallel to the contact surface. When the component of is Ih, Tv>ih.
なお、前記接触部はクロム、銅を主成分とした材料から
なり、例えばＣｕ −Ｃｒ −Ｍ ｏの複合金属が採用
される。The contact portion is made of a material containing chromium or copper as a main component, such as a Cu-Cr-Mo composite metal.
また、前記アーク部は磁性材料と銅を主成分とした材料
からなり、Ｆｅ−０ｒや磁性ステンレス鋼−Ｃｕの複合
金属が採用される。Further, the arc portion is made of a material mainly composed of a magnetic material and copper, and a composite metal such as Fe-0r or magnetic stainless steel-Cu is used.
Ｆ 作 用
上記真空インクラブタ用電極でζよ、電流のしゃ断時、
アーク集中を起こすことなく、発生した金属蒸気の自己
拡散力によって発生各アークは接触部からアーク部へと
移動し、アーク部において各アークは全体回転するので
、電極面を有効に利用してしゃ断が行なわれる。F action When the current is cut off using the electrode for the vacuum incretor mentioned above,
Without arc concentration, each generated arc moves from the contact area to the arc area due to the self-diffusion force of the generated metal vapor, and each arc rotates as a whole in the arc area, so the electrode surface can be used effectively for interruption. will be carried out.
また、接触部材同志が確実に接触し、接触抵抗、しゃ断
性能が安定する。Further, the contact members are in reliable contact with each other, and contact resistance and breaking performance are stabilized.
実施例
第１図、第２図、第３図には本発明の一実施例に係る真
空インクラブタ用電極の平面、その■−■矢視断面、そ
の■部拡大を示しである。Embodiment FIG. 1, FIG. 2, and FIG. 3 show a plan view of an electrode for a vacuum incluctor according to an embodiment of the present invention, its cross section taken along arrows 1--2, and an enlarged view of section 2.
当該電極のアーク部２１は、中央部に貫通孔２２を有す
る円盤リング状をなし、貫通孔２２内局面付近から外周
面にかけて多数のスパイラル溝２３が形成しである。The arc portion 21 of the electrode has a disk ring shape with a through hole 22 in the center, and a large number of spiral grooves 23 are formed from near the inner surface of the through hole 22 to the outer peripheral surface.
本実施例に係る電極では、アーク部２１の背面２１ａに
は、ステンレス、インコネル等製の補強板２４が設けで
ある。In the electrode according to this embodiment, a reinforcing plate 24 made of stainless steel, Inconel, etc. is provided on the back surface 21a of the arc portion 21.
アーク部２１の背面側から貫通孔２２にはり−ド捧２５
の先端部が嵌合してあり、り一ド棒２５外周面に突設さ
れた肩部２６が補強板２４裏面に当接されている。リー
ド棒２５先端部とアーク部２１とはろう付は結合される
。A beam 25 is inserted into the through hole 22 from the back side of the arc portion 21.
A shoulder portion 26 protruding from the outer circumferential surface of the reinforcing rod 25 is in contact with the back surface of the reinforcing plate 24. The tip of the lead rod 25 and the arc portion 21 are joined by brazing.
リード棒２５の先端面２５ａには凹穴２７があけである
。この凹穴２７の深さは、少なくともその底面２７ａが
アーク部２１の背面２１ａよりリード棒２５根元側に来
るようにしである。A recessed hole 27 is formed in the distal end surface 25a of the lead rod 25. The depth of the recessed hole 27 is such that at least its bottom surface 27a is closer to the base of the lead rod 25 than the back surface 21a of the arc portion 21.
一方、アーク部２１の表面側において貫通孔２２には、
リング状の接触面２８ａを有する接触部２８が嵌着しで
ある。接触部２８において、接触面２８ａの外径りは接
触部２８ｍｍ以上としである。つまり、接触面２８ａは
接触部２ｇの表面にテーパを介して突出する如く形成さ
れるのである。接触面２８ａの外径りはリード棒２５の
外径ｄ以下の寸法であればよいが、この実施例では、接
触面２８ａの外径りをリード棒２５の外径ｄより小さく
しである。なお、接触面２８ａの内径り、はリード棒２
５先端の凹穴２７の内径ｄとほぼ等しいものとしである
。On the other hand, in the through hole 22 on the surface side of the arc portion 21,
A contact portion 28 having a ring-shaped contact surface 28a is fitted. In the contact portion 28, the outer diameter of the contact surface 28a is 28 mm or more at the contact portion. In other words, the contact surface 28a is formed so as to protrude from the surface of the contact portion 2g via a taper. The outer diameter of the contact surface 28a may be smaller than the outer diameter d of the lead rod 25, but in this embodiment, the outer diameter of the contact surface 28a is made smaller than the outer diameter d of the lead rod 25. Note that the inner diameter of the contact surface 28a is the same as the lead rod 2.
The inner diameter d of the concave hole 27 at the tip of the hole 5 is approximately equal to the inner diameter d.
接触部２８の底面２８ｂはリード棒２５のリング状の先
端面２５ａに密着し、接触部２８周面とアーク部２１及
び接触部底面２８ｂとリード棒先端面２５ａとζよろう
付は結合されている。つまり、接触部２８の背面にリー
ド棒２５の先端面を直接接続した構造となっているので
ある。The bottom surface 28b of the contact portion 28 is in close contact with the ring-shaped tip surface 25a of the lead rod 25, and the circumferential surface of the contact portion 28, the arc portion 21, the contact portion bottom surface 28b and the lead rod tip surface 25a are connected by ζ brazing. There is. In other words, the structure is such that the tip end surface of the lead rod 25 is directly connected to the back surface of the contact portion 28.
上記のように、各部の寸法を決め、かつ接続構成するこ
とによって、少なくとも通電時においては、リード棒２
５から接触面２８ａに至る抵抗の少ない直線的な電流路
が確保され、接触面２８ａに直交する方向の電流成分を
太き（とることができるのである。As described above, by determining the dimensions of each part and configuring the connections, the lead rod 2
5 to the contact surface 28a is ensured, and the current component in the direction perpendicular to the contact surface 28a can be thick.
また、接触面２８ａの外周部に所定寸法以上（１順以上
）の接触部材が存在することから、閉極時においても、
接触部２８がアーク部２１に当たりあるいは接触して接
触抵抗にバラツキが生ずることも回避される。In addition, since there are contact members of a predetermined size or more (in order of one or more) on the outer periphery of the contact surface 28a, even when the contact is closed,
It is also avoided that the contact portion 28 hits or contacts the arc portion 21, causing variations in contact resistance.
なお、本実施例では、スパイラル溝２３の内端部は、第
１図ウニ点鎖ｉＪ ｒ ２３ ａ Ｊで示す如く接触部
２８の部分まで延長した溝３０に形成してもよい。In this embodiment, the inner end of the spiral groove 23 may be formed into a groove 30 extending to the contact portion 28 as shown by the dot chain iJ r 23 a J in FIG.
第１，２図に示した実施例において、接触部２８は接触
面２８ａの外径が４０ ｎｍ＋ 、内径２０＋ｍｎで、
Ｍｏ−Ｃｒの多孔質焼結体にＣｕを溶浸して形成される
。In the embodiment shown in FIGS. 1 and 2, the contact portion 28 has a contact surface 28a having an outer diameter of 40 nm+ and an inner diameter of 20+ mn,
It is formed by infiltrating Cu into a porous sintered body of Mo-Cr.
アーク部２１は外径８０ｍｍ、スパイラル溝の数（＝ア
ークペダル２１ｂの数）は１２、スパイラル溝２３の幅
は４ ｍｍで、Ｆｅ、Ｃｒの多孔質焼結体にＣｕを溶浸
したＣｕ （５０％）−Ｆｅ（４２％）−Ｃｒ（８％）
の成分からなる材料にて形成される。The arc part 21 has an outer diameter of 80 mm, the number of spiral grooves (=the number of arc pedals 21b) is 12, and the width of the spiral groove 23 is 4 mm. 50%)-Fe(42%)-Cr(8%)
It is made of a material consisting of the following components.
上記構成の電極を第５図に示すように、固定電極３１、
可動電極３２として真空インタラプタを構成し、電極径
を変えて電流しゃ断性能について試験した結果を第６図
に示す。As shown in FIG. 5, the electrodes with the above configuration are fixed electrodes 31,
A vacuum interrupter was constructed as the movable electrode 32, and the current interrupting performance was tested by changing the electrode diameter. The results are shown in FIG.
第５図において、真空インクラブタの構成部材は第１０
図に示したものと同じであり、同一部材は同一符号で示
しである。なお、試験の条件は、電圧１２ｋＶ、電極間
ギャップ１２ｍｒＲである。In FIG. 5, the constituent members of the vacuum ink cleaner are shown in
It is the same as that shown in the figure, and the same members are indicated by the same reference numerals. Note that the test conditions were a voltage of 12 kV and an interelectrode gap of 12 mrR.
通電時及び開極直後（アークが接触面上に存在する間）
においては、リード棒２５と接触面２８ａとの間の電流
路が、接触面２８ａに直交するもの（第２図、第１１図
中ので示す）が大半（Ｉｖ＞Ｉｈ）となるので、しゃ断
時に生ずる金属蒸気の自己拡散力によって、アークは放
射方向に広がって、接触部からアーク部へ移動し、アー
ク部におけろスパイラル溝の作用によって回転移動し、
消弧する。During energization and immediately after contact opening (while the arc exists on the contact surface)
In this case, most of the current paths between the lead rod 25 and the contact surface 28a are perpendicular to the contact surface 28a (indicated by a circle in FIGS. 2 and 11) (Iv>Ih), so when the current path is cut off, Due to the self-diffusion force of the resulting metal vapor, the arc spreads in the radial direction and moves from the contact area to the arc area, where it rotates due to the action of the spiral groove,
Extinguish the arc.
第１図において、アークの移動を説明的に矢印Ａで示し
である。In FIG. 1, the movement of the arc is illustrated by an arrow A.
試験の結果、本発明の電極を用いた真空インクラブタに
おけるしゃ断性能（第６図中０−０で示す）は従来品の
もの（第６図中×−×で示す）より谷径において１０〜
３０％良好であす、シかも１２０間の大径のものにおい
ても、極めて良好な結果が得られた。As a result of the test, the breaking performance (indicated by 0-0 in Fig. 6) of the vacuum incluctor using the electrode of the present invention was 10 to 10 times lower in the valley diameter than that of the conventional product (indicated by x-x in Fig. 6).
Very good results were obtained even with large diameters between 30% and 120%.
なお、真空インクラブタを構成するに際しては、少なく
とも一方の電極を本発明に係る電極とし、もう一方の電
極を凹穴のないものとしても所期の効果を得ることがで
きる。Note that when constructing a vacuum incluctor, the desired effect can be obtained even if at least one electrode is the electrode according to the present invention and the other electrode is one without a recessed hole.
■ 発明の効果
本発明に係る真空インタラプタ用磁気駆動型電極は、少
なくとも通電時において接触部の接触面とリード棒との
間に形成される電流路におけろ電流成分を、接触面に直
交する方向の成分をＩｖ、接触面に平行する方向の成分
をＩｈとしたとき、Ｉｖ＞Ｉｈ’となるように接触部、
アーク部、リード棒を接続構成して、電流しゃ断時に発
生する金属蒸気の自己拡散力によってアークが接触部か
らアーク部へ移動し、アーク部において全体回転して消
弧するようにしたので、しゃ断性能が向上し、電極面を
有効に利用できることから電極径の小型化、ひいては真
空インタラプタの小型化が達成できる。■ Effects of the Invention The magnetically driven electrode for a vacuum interrupter according to the present invention directs the current component in the current path formed between the contact surface of the contact portion and the lead rod at least perpendicularly to the contact surface during energization. When the component in the direction is Iv and the component in the direction parallel to the contact surface is Ih, the contact portion is adjusted so that Iv>Ih'.
The arc part and the lead rod are connected in such a way that the arc moves from the contact part to the arc part by the self-diffusion force of the metal vapor generated when the current is cut off, and the whole body rotates in the arc part to extinguish the arc. Since performance is improved and the electrode surface can be used effectively, the electrode diameter can be reduced, and the vacuum interrupter can also be made smaller.
また、シールドのよごれ及びパリの発生が抑えられるこ
とから、耐電圧の向上、大電流しゃ断回数の増大が図れ
る。In addition, since the shield is prevented from becoming dirty and the occurrence of flakes, the withstand voltage can be improved and the number of times the large current can be cut off can be increased.
さらに、接触部における接触面の外径を接触部自体の外
径より所定寸法以上小さくして、閉極時の接触抵抗のバ
ラツキを小さく抑えるようにしたので、局部的な加熱な
ども生ぜず、品質の安定が保たれる。接触部材同志が確
実に接触するので、接触抵抗、しゃ断性能も安定する。Furthermore, the outer diameter of the contact surface in the contact part is made smaller than the outer diameter of the contact part itself by a predetermined dimension or more to suppress variations in contact resistance during closing, so local heating does not occur. Stable quality is maintained. Since the contact members are in reliable contact with each other, contact resistance and breaking performance are also stable.
第１図は本発明の一実施例に係る真空インクラブタ用電
極の平面図、第２図はそのＩＩ−ＩＩ矢視断面図、第３
図は第２図中の■部の拡大図、第４図は接触部自体と接
触面との径差による接触抵抗のバラツキを示すグラフ、
第５図は実施例に係る電極を備えた真空インクラブタの
縦断面図、第６図は電極径としゃ断性能との関係を示す
グラフ、第７図は従来の磁気駆動型電極の平面図、第８
図はその■−■矢視断面図、第９図は従来の電極の電極
径としゃ断性能との関係を示すグラフ、第１０図は真空
インタラプタの概略図、第１１図は電流路の説明図であ
る。
図 面 中、
第１図
一実施例に係る電極の平面図
第２図
第１図の■−■矢視断面図
１はアーク部、
３はスパイラル溝、
５はリード棒、
５ａはリード棒先端面、
７は凹穴、
８は接触部、
８ａは接触面である。
特 許 出 願
株式会社 明
代 理FIG. 1 is a plan view of an electrode for a vacuum incretor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along arrow II-II, and FIG.
The figure is an enlarged view of part ■ in Figure 2, and Figure 4 is a graph showing the variation in contact resistance due to the difference in diameter between the contact part itself and the contact surface.
FIG. 5 is a longitudinal cross-sectional view of a vacuum incretor equipped with an electrode according to an embodiment, FIG. 6 is a graph showing the relationship between electrode diameter and cutting performance, and FIG. 7 is a plan view of a conventional magnetically driven electrode. 8
The figure is a cross-sectional view taken along the ■-■ arrow, Figure 9 is a graph showing the relationship between the electrode diameter and breaking performance of a conventional electrode, Figure 10 is a schematic diagram of a vacuum interrupter, and Figure 11 is an explanatory diagram of the current path. It is. In the drawings, FIG. 1 is a plan view of an electrode according to an embodiment. FIG. 2 is a cross-sectional view taken along the arrows 1 to 1 in FIG. 7 is a recessed hole, 8 is a contact portion, and 8a is a contact surface. Patent Application Co., Ltd. Osamu Akiyo
Claims (1)
部にリング状の接触面を具備する接触部を設け、他方の
面の中央部にリード棒を接続してなる真空インタラプタ
用磁気駆動型電極において、 前記接触面の外径を前記リード棒の直径以下にすると共
に、前記接触面の半径を前記接触部材自体の半径より１
ｍｍ以上小さくして、少なくとも通電時において前記接
触面と前記リード棒との間に形成される電流路における
電流成分を、接触面に直交する方向の成分をＩｖ、接触
面に平行する方向の成分をＩｈとしたとき、Ｉｖ＞Ｉｈ
となるようにしたことを特徴とする真空インタラプタ用
磁気駆動型電極。[Claims] A vacuum formed by providing a contact portion having a ring-shaped contact surface in the center of one surface of an arc portion having a plurality of spiral grooves, and connecting a lead rod to the center of the other surface. In the magnetically driven electrode for an interrupter, the outer diameter of the contact surface is set to be equal to or less than the diameter of the lead rod, and the radius of the contact surface is set to 1 greater than the radius of the contact member itself.
mm or more, and at least when current is applied, the current component in the current path formed between the contact surface and the lead rod, the component in the direction perpendicular to the contact surface is Iv, and the component in the direction parallel to the contact surface When Ih is Iv>Ih
A magnetically driven electrode for a vacuum interrupter, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019610A JP2689568B2 (en) | 1989-01-31 | 1989-01-31 | Magnetically driven electrodes for vacuum interrupters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1019610A JP2689568B2 (en) | 1989-01-31 | 1989-01-31 | Magnetically driven electrodes for vacuum interrupters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02201836A true JPH02201836A (en) | 1990-08-10 |
| JP2689568B2 JP2689568B2 (en) | 1997-12-10 |
Family
ID=12003960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1019610A Expired - Lifetime JP2689568B2 (en) | 1989-01-31 | 1989-01-31 | Magnetically driven electrodes for vacuum interrupters |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2689568B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211479B1 (en) | 1998-10-06 | 2001-04-03 | Mitsubishi Denki Kabushiki Kaisha | Persistent current circuit switch |
-
1989
- 1989-01-31 JP JP1019610A patent/JP2689568B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6211479B1 (en) | 1998-10-06 | 2001-04-03 | Mitsubishi Denki Kabushiki Kaisha | Persistent current circuit switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2689568B2 (en) | 1997-12-10 |
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