JPH046246B2 - - Google Patents

Description

【発明の詳細な説明】 Ａ 産業上の利用分野 本発明は真空開閉器に係り、特に誘発截断サー
ジの発生を防止するようにした真空電磁接触器に
関する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a vacuum switch, and more particularly to a vacuum electromagnetic contactor that prevents the occurrence of induced cutting surges.

Ｂ 従来の技術 本発明は第１相、第２相および第３相に対応し
て第１、第２、第３の真空スイツチを備えた真空
電磁接触器において、第１の真空スイツチには第
１の操作レバーと第１のラツチ部を連設し、第
２、第３の真空スイツチには第２の操作レバーと
第２のラツチ部を連設して、１個の操作電磁石と
１個の引外し鉄心により操作するとともに、第１
のラツチ部の動作タイミングと第２のラツチ部の
動作タイミングをずらして第１の真空スイツチの
開極と第２、第３の真空スイツチの開極に時間差
を持たして誘発截断サージの発生を防止したもの
である。B. Prior Art The present invention provides a vacuum electromagnetic contactor equipped with first, second, and third vacuum switches corresponding to a first phase, a second phase, and a third phase. A first operation lever and a first latch part are connected in series, a second operation lever and a second latch part are connected in succession to the second and third vacuum switches, and one operation electromagnet and one operation electromagnet are connected to each other. The trip iron is operated by the first trip iron.
The operation timing of the first latch part and the operation timing of the second latch part are shifted to create a time difference between the opening of the first vacuum switch and the opening of the second and third vacuum switches, thereby preventing the occurrence of an induced cutting surge. This was prevented.

Ｃ 従来の技術 第５図は従来の３相電磁接触器の構造を示す正
面図、第６図は側面図である。これらの図に示す
ように、真空スイツチ１Ａ〜１Ｃはそれぞれ固定
側が絶縁フレーム１４に取付けられた上部端子２
ａ〜２ｃに接続され、可動側がフレキシブルリー
ド４ａ〜４ｃを介して下部端子５ａ〜５ｃに電気
的に接続されている。また、各可動リード３ａ〜
３ｃは絶縁ロツド６ａ〜６ｃを介して操作レバー
８に連結されている。可動鉄心１０の基部は操作
軸９を介して操作レバー８に取付けられている。
第６図において１１は断面Ｌ字状の取付枠１２に
固設された操作電磁石、１３は取付枠１２と可動
鉄心１０間に設けられたしや断バネである。第５
図および第７図において、３０は操作軸９に取付
けられた操作アーム、３１は操作アーム３０の先
端に設けられたコロ、３２は軸３３に枢支された
コロ３１と係合離脱するフツク、３４は引外し電
磁石、３５はこの引外し電磁石３４の可動鉄心で
ある。C. Prior Art FIG. 5 is a front view showing the structure of a conventional three-phase magnetic contactor, and FIG. 6 is a side view. As shown in these figures, each of the vacuum switches 1A to 1C has an upper terminal 2 attached to an insulating frame 14 on the fixed side.
a to 2c, and the movable side is electrically connected to lower terminals 5a to 5c via flexible leads 4a to 4c. In addition, each movable lead 3a~
3c is connected to the operating lever 8 via insulating rods 6a to 6c. The base of the movable core 10 is attached to the operating lever 8 via the operating shaft 9.
In FIG. 6, reference numeral 11 designates an operating electromagnet fixed to a mounting frame 12 having an L-shaped cross section, and reference numeral 13 designates a bow spring provided between the mounting frame 12 and the movable iron core 10. Fifth
In the figures and FIG. 7, 30 is an operating arm attached to the operating shaft 9, 31 is a roller provided at the tip of the operating arm 30, 32 is a hook that engages with and disengages from the roller 31 that is pivotally supported on the shaft 33; 34 is a tripping electromagnet, and 35 is a movable core of this tripping electromagnet 34.

操作電磁石１１が付勢されると可動鉄心１０が
しや断バネ１３に抗して操作電磁石１１に吸引さ
れる。これにより操作レバー８は上部に引き上げ
られ投入状態となる。投入する場合、操作軸９が
回転し、操作アーム３０に取付けたコロ３１がフ
ツク３２の上に乗り上げて機械的に投入状態を保
持する。またこのときワイプバネ７ａ（７ｂ，７
ｃ）によりコンタクトは加圧状態にありワイプ長
ａ（mm）を保つている。しや断する場合は、引外
し電磁石３４を励磁して可動鉄心３５の先端でフ
ツク３２をたたくことにより、フツク３２とコロ
３１の係合がはずれ可動鉄心１０がしや断バネ１
３により押され操作レバー８が引下げられてしや
断状態となる。以上の動作は３相一括に取付けら
れた操作軸９を中心に行われるので三相同時に動
作する。 When the operating electromagnet 11 is energized, the movable iron core 10 is attracted to the operating electromagnet 11 against the armature spring 13. As a result, the operating lever 8 is pulled upward and placed in the closed state. When charging, the operating shaft 9 rotates, and the roller 31 attached to the operating arm 30 rides on the hook 32 to mechanically maintain the charging state. Also at this time, the wipe springs 7a (7b, 7
Due to c), the contact is in a pressurized state and maintains the wipe length a (mm). To break the break, excite the tripping electromagnet 34 and hit the hook 32 with the tip of the movable core 35. This will disengage the hook 32 and the rollers 31, causing the movable core 10 to break and break the break spring 1.
3, the operating lever 8 is pulled down and becomes in a shattered state. The above operations are performed centering around the operating shaft 9 attached to all three phases, so the three phases operate simultaneously.

Ｄ 発明が解決しようとする問題点 真空電磁接触器は、真空バルブを消弧室として
備えているので、優れた消弧能力、絶縁回復特性
を有するが開閉サージを発生するという欠点があ
る。そのため真空電磁接触器の負荷側に接続され
たモータ等の絶縁を脅すという問題がある。それ
故、開閉サージ電圧を低く抑える必要があり、真
空しや断器の接点材料として高価なAg系のもの
やBiなど低融点のもので電流截断値の低い（1A
以下）ものを使用し、截断サージの抑制を図つて
いる。D. Problems to be Solved by the Invention Since the vacuum electromagnetic contactor is equipped with a vacuum valve as an arc extinguishing chamber, it has excellent arc extinguishing ability and insulation recovery characteristics, but has the drawback of generating switching surges. Therefore, there is a problem that the insulation of the motor etc. connected to the load side of the vacuum electromagnetic contactor is threatened. Therefore, it is necessary to suppress the switching surge voltage to a low level, and as a contact material for vacuum shields and disconnectors, expensive Ag-based materials and low melting point materials such as Bi are used, which have a low current cutting value (1A
(below) is used to suppress cutting surges.

しかし、再発弧サージ、発生サージのうちで最
も大きい再発弧による誘発截断サージの問題があ
る。したがつて高価なサージアブソーバが必要と
なる。 However, there is a problem with the re-ignition surge and the cutting surge induced by the re-ignition, which is the largest of the generated surges. Therefore, an expensive surge absorber is required.

誘発截断サージのメカニズムは、接触器の電源
側および負荷側にケーブルのような適当な容量の
キヤパシタンスがあるような回路条件で遅れ力率
の小電流を接触器でしや断する場合に発生する。 The induced disconnection surge mechanism occurs when a contactor disconnects a small current with a lagging power factor under circuit conditions where there is adequate capacitance, such as a cable, on the power and load sides of the contactor. .

すなわち、第８図は等価回路を示し、第９図は
３相一括しや断時の電圧電流波形を示すものであ
る。第９図において、Ｌは負荷インダクタンス、
Ｒは負荷レジスタンス、L₀は線路の漏れインダ
クタンス、C₀は線路のストレイキヤパシタンス、
１ｕ，１ｖ，１ｗはそれぞれＵ，Ｖ，Ｗ相におけ
る接点である。すなわち、三相一括に開極するの
で第９図Ａ〜Ｆに示すようにＰ点で開極したとす
ると、Ｕ相が電流零を迎え、電流i_uはしや断され
るが真空スイツチ１Ａ〜１Ｃのコンタクト間のギ
ヤツプが短いため再起電圧よりも極間耐圧が下ま
わり閃絡する。そして、第９図の等価回路におい
て発弧電流がC₀−L₀−１ｕ−L₀−C₀を通して流
れるが、真空しや断器の消弧能力が高いことから
その発弧電流もしや断され再び再起電圧が立上
る。このとき、Ｖ，Ｗ相の極間耐電圧も再起電圧
よりも下まわるため、Ｖ，Ｗ相は閃絡する。この
繰返し発弧によりＵ相には発弧サージが発生す
る。一方、発弧電流はＶ，Ｗ相にもC₀，L₀を通
じて流れるため、第１０図に示すように強制的に
電流零点を迎え、しや断される。このことより通
常では１アンペア以下の截断電流値がそれよりも
数倍もの電流を截断したことになり、大きな截断
（誘発截断）サージ電圧が発生する。 That is, FIG. 8 shows an equivalent circuit, and FIG. 9 shows voltage and current waveforms when three phases are simultaneously disconnected. In Fig. 9, L is the load inductance,
R is the load resistance, L ₀ is the leakage inductance of the line, C ₀ is the stray capacitance of the line,
1u, 1v, and 1w are contacts in U, V, and W phases, respectively. That is, since the three phases are opened at once, if the contact is opened at point P as shown in FIG. 9A to F, the current in the U phase reaches zero and the current _i Since the gap between the contacts of ~1C is short, the inter-electrode withstand voltage is lower than the restart voltage, causing a flashover. In the equivalent circuit shown in Fig. 9, the firing current flows through C ₀ -L ₀ -1u-L ₀ -C ₀ , but because the arc extinguishing ability of the vacuum circuit breaker is high, the firing current is soon cut off. The restart voltage rises again. At this time, since the withstand voltage between the electrodes of the V and W phases is also lower than the re-electromotive voltage, a flash short circuit occurs in the V and W phases. This repeated firing causes a firing surge in the U phase. On the other hand, since the firing current also flows through C ₀ and L ₀ in the V and W phases, the current forcibly reaches a zero point and is interrupted as shown in FIG. This means that normally a cutting current value of 1 ampere or less cuts a current several times that value, and a large cutting (induced cutting) surge voltage is generated.

Ｅ 問題点を解決するための手段 本発明は前述の問題点を解決するために、電源
の第１相、第２相および第３相に対応して第１の
真空スイツチ、第２の真空スイツチおよび第３の
真空スイツチを備えた開閉部と、該開閉部を投
入、しや断命令に応答して開閉操作する開閉操作
部とからなる真空開閉器において、 前記開閉操作部が、前記開閉部の第１の真空ス
イツチを開閉操作する第１の操作部と、前記第
２、第３の真空スイツチを開閉操作する第２の操
作部とからなり、 前記第１の操作部が、前記第１の真空スイツチ
の可動側に連設された第１の操作レバーと、該第
１の操作レバーを前記投入、しや断命令に応答し
て動作させる操作電磁石および第１のしや断バネ
と、前記しや断命令に応答して前記第１の真空ス
イツチの投入状態を解除する第１のラツチ部とか
らなり、 前記第２の操作部が、前記しや断命令に応答し
前記操作電磁石と関連して動作する第２のしや断
バネと、前記第２、第３の真空スイツチの投入状
態を保持する第２のラツチ部とを備え、 前記第１のラツチ部が、第１のフツクと、前記
しや断命令に応答して動作する引外し電磁石の可
動鉄心に連設され前記第１のフツクから所定距離
を置いて対設された第１の作動アームとによつて
構成され、 前記第２のラツチ部が第２のフツクと、前記引
外し電磁石の引外し鉄心に連設され前記第２のフ
ツクから所定距離を置いて対設された第２の作動
アームとからなり、 前記第１のフツクと第１の作動アーム間の距離
を前記第２のフツクと第２の作動アーム間の距離
よりも小となるように設定して構成した真空開閉
器を提供するものである。E Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a first vacuum switch, a second vacuum switch corresponding to the first phase, second phase and third phase of the power supply. and a vacuum switch comprising an opening/closing section provided with a third vacuum switch, and an opening/closing operation section that opens and closes the opening/closing section in response to a command to turn on or off the opening/closing section. a first operating section that opens and closes the first vacuum switch; and a second operating section that opens and closes the second and third vacuum switches; a first operating lever connected to the movable side of the vacuum switch; an operating electromagnet and a first crinkling spring that operate the first operating lever in response to the closing and crinkling commands; a first latch part that releases the closed state of the first vacuum switch in response to the damping command, and a second operating part that releases the operating electromagnet in response to the damping command. a second latch portion that maintains the closed state of the second and third vacuum switches; and a second latch portion that maintains the closed state of the second and third vacuum switches; and a first actuating arm connected to the movable core of the tripping electromagnet that operates in response to the shunting command and opposed to the first hook at a predetermined distance, The second latch portion includes a second hook and a second actuation arm that is connected to the tripping core of the tripping electromagnet and opposed to it at a predetermined distance from the second hook, and A vacuum switch is provided in which the distance between the first hook and the first operating arm is set to be smaller than the distance between the second hook and the second operating arm.

Ｆ 作用 投入命令により１個の操作電磁石が励磁され、
第１、第２の操作レバーが第１、第２のしや断バ
ネのバネ力に抗して回動され、これにより第１、
第２、第３の真空スイツチが投入される。投入状
態は第１、第２のラツチ部によつて保持される。F Effect One operating electromagnet is energized by the closing command,
The first and second operation levers are rotated against the spring force of the first and second blade springs, thereby causing the first and second operation levers to rotate.
The second and third vacuum switches are turned on. The closed state is maintained by the first and second latch parts.

しや断命令が発せられると、１個の引外し電磁
石が動作し、まず第１のラツチ部が作動して第１
の真空スイツチが開極し、所定時間後に第２のラ
ツチ部が作動して第２、第３の真空スイツチが開
極する。 When a cut-off command is issued, one tripping electromagnet is activated, and the first latch is activated and the first
The vacuum switch is opened, and after a predetermined time, the second latch is actuated to open the second and third vacuum switches.

Ｇ 実施例 以下に本発明を第１図〜第４図に示す実施例に
よつて具体的に説明する。G. Examples The present invention will be specifically explained below using examples shown in FIGS. 1 to 4.

本実施例においては、第１図に示すように、真
空スイツチ１Ａを操作するための第１の操作部３
６Ａと、他の２相の真空スイツチ１Ｂ，１Ｃを同
時に操作するための第２の操作部３６Ｂが設けら
れている。すなわち、絶縁フレーム１４には操作
軸９が取付けられており、この操作軸９に関連し
て第１の操作部３６Ａと第２の操作部３６Ｂが形
成される。第１の操作部３６Ａにおいては、真空
スイツチ１Ａの絶縁ロツド６ａに操作レバー８ａ
が取付けられており、操作レバー８ａには可動鉄
心１０ａが連設され、これらの操作レバー８ａと
可動鉄心１０ａは操作軸９に回動可能に取付けら
れている。第１の操作部３６Ａにおいては、第６
図に示す構成の操作電磁石１１と第１のしや断バ
ネ１３ａが設けられているとともに、第１のラツ
チ部３７Ａが設けられている。 In this embodiment, as shown in FIG. 1, a first operating section 3 for operating a vacuum switch 1A is provided.
A second operation section 36B is provided for simultaneously operating the vacuum switch 6A and the other two-phase vacuum switches 1B and 1C. That is, an operating shaft 9 is attached to the insulating frame 14, and a first operating section 36A and a second operating section 36B are formed in relation to this operating shaft 9. In the first operating section 36A, the operating lever 8a is connected to the insulating rod 6a of the vacuum switch 1A.
A movable iron core 10a is attached to the operating lever 8a, and the operating lever 8a and the movable iron core 10a are rotatably attached to the operating shaft 9. In the first operation section 36A, the sixth
The operating electromagnet 11 and the first armature spring 13a having the configuration shown in the figure are provided, as well as a first latch portion 37A.

第２の操作部３６Ｂにおいては、真空スイツチ
１Ｂ，１Ｃの絶縁ロツド６ｂ，６ｃに第２の操作
レバー８ｂが取付けられており、第２の操作レバ
ー８ｂには可動鉄心１０ｂが連設され、これらの
第２の操作レバー８ｂと可動鉄心１０ｂも操作軸
９に回動可能に取付けられているとともに、第２
のラツチ部３７Ｂが設けられている。また第２の
操作部３６Ｂにおいては第２のしや断バネ１３ｂ
が設けられており、投入操作にあたつては操作電
磁石１１を共用するとともに、第１の操作部３６
Ａの可動鉄心１０ａの動作を第２の操作部３６Ｂ
の可動鉄心１０ｂに伝達するようにしている。動
作伝達手段としては可動鉄心１０ａに腕部１０ｃ
を可動鉄心１０ｂと係合するように一体に形成す
る。 In the second operating section 36B, a second operating lever 8b is attached to the insulating rods 6b, 6c of the vacuum switches 1B, 1C, and a movable iron core 10b is connected to the second operating lever 8b. The second operation lever 8b and movable iron core 10b are also rotatably attached to the operation shaft 9, and the second
A latch portion 37B is provided. In addition, in the second operating portion 36B, the second shear spring 13b
is provided, and the operating electromagnet 11 is shared during the closing operation, and the first operating section 36
The operation of the movable iron core 10a of A is controlled by the second operating section 36B.
The signal is transmitted to the movable iron core 10b. As a motion transmission means, an arm portion 10c is attached to the movable core 10a.
is integrally formed so as to engage with the movable iron core 10b.

第２図に示すように第１のラツチ部３７Ａは第
１の操作レバー８ａに連結された第１の操作アー
ム３０ａ、第１のコロ３１ａおよび第１のフツク
３２ａによつて構成され、第２のラツチ部３７Ｂ
は第２の操作レバー８ｂに連結された第２の操作
アーム３０ｂ、第２のコロ３１ｂおよび第１のフ
ツク３２ｂによつて構成されている。引外し電磁
石３４は第１の操作部３６Ａと第２の操作部３６
Ｂに共用し、該引外し電磁石３４の可動鉄心３５
にはそれぞれフツク３２ａ，３２ｂに対向して作
動アーム３８ａ，３８ｂが連結されている。 As shown in FIG. 2, the first latch portion 37A is composed of a first operating arm 30a connected to a first operating lever 8a, a first roller 31a, and a first hook 32a. latch part 37B
is composed of a second operating arm 30b connected to a second operating lever 8b, a second roller 31b, and a first hook 32b. The tripping electromagnet 34 has a first operating section 36A and a second operating section 36.
The movable iron core 35 of the tripping electromagnet 34 is shared with B.
Operating arms 38a, 38b are connected to the hooks 32a, 32b, respectively.

可動鉄心３５を介してフツク３２ａは作動アー
ム３８ａによつて動作され、フツク３２ｂは作動
アーム３８ｂによつて動作される。また、第１相
に対して他の第２、３相のしや断を遅らせるため
に第１の作動アーム３８ａの長さを第２作動アー
ム３８ｂの長さよりも大きくし、第１の作動アー
ム３８ａと第１のフツク３２ａまでの距離をａ
（mm）、第２の作動アーム３８ｂと第２のフツク３
２ｂまでの距離をｂ（mm）（ｂ＞ａ）に設定する。 Through the movable iron core 35, the hook 32a is operated by an operating arm 38a, and the hook 32b is operated by an operating arm 38b. Further, in order to delay the shearing of the other second and third phases with respect to the first phase, the length of the first actuating arm 38a is made larger than the length of the second actuating arm 38b, and the first actuating arm 38a and the first hook 32a is a
(mm), second actuation arm 38b and second hook 3
Set the distance to 2b as b (mm) (b>a).

したがつて、引外し電磁石３４が付勢されると
可動鉄心３５が第２図において左方向に移動し、
作動アーム３８ａ，３８ｂがフツク３２ａ，３２
ｂをたたき、これによりフツク３２ａ，３２ｂと
コロ３１ａ，３１ｂとの係合が外れて真空スイツ
チ１Ａ〜１Ｃのしや断動作が遂行される。しかる
に、ｂ＞ａに設定されているため第１相と他の第
２、３相との間には開極時間差が生じ、第１相に
対して第２、３相の開極が遅れることになる。こ
れにより、第３図Ａ〜Ｆに示すように第１相の発
弧電流が流れてもその間は第２、３相は閉じてい
るので誘発截断はおこらない。 Therefore, when the tripping electromagnet 34 is energized, the movable core 35 moves to the left in FIG.
The operating arms 38a, 38b are hooks 32a, 32
b is struck, thereby disengaging the hooks 32a, 32b from the rollers 31a, 31b, and performing the bending/disconnecting operation of the vacuum switches 1A to 1C. However, since b>a is set, there is a difference in opening time between the first phase and the other second and third phases, and the opening of the second and third phases is delayed relative to the first phase. become. As a result, even if the first phase firing current flows as shown in FIGS. 3A to 3F, the second and third phases are closed during that time, so no induced cutting occurs.

投入動作時には、投入命令により可動鉄心１０
ａが操作電磁石１１に吸引される時、可動鉄心ア
ーム１０ｃが他相の可動鉄心１０ｂを押して同時
に第２、３相投入させる。 During the closing operation, the movable iron core 10 is activated by the closing command.
When a is attracted to the operating electromagnet 11, the movable core arm 10c pushes the movable core 10b of the other phase to simultaneously input the second and third phases.

誘発截断サージの発生を防止するためには第１
相しや断と第２、３相との開極時間差が1/3サイ
クル以上であることが望ましい。誘発截断サージ
は発弧電流が他相に乗じることによつて生じる
が、その発端は３相いずれかのうち１相が発弧す
ることにある。発弧は電流零点での開極あるいは
極めてアーク時間の短い開極でなければ生じない
ので、第１相が開極し、1/3サイクル後に他の第
２、第３相が開極すると誘発截断は起らない。 In order to prevent the occurrence of induced cutting surge, the first step is to
It is desirable that the difference in opening time between the phase and phase and the second and third phases is 1/3 cycle or more. The induced cutting surge occurs when the firing current multiplies other phases, and its origin lies in the firing of one of the three phases. Since arcing occurs only when the current is zero or when the arcing time is extremely short, it is triggered when the first phase is opened and the other 2nd and 3rd phases are opened 1/3 cycle later. No cutting occurs.

すなわち、第４図Ａに示すように第１相の開極
をＵ相とすると、Ａ点においてＶ，Ｗ相に発弧電
流が乗じても1/3サイクル後のA′，P′点で開極す
るので発弧電流が乗じている間は確実にＶ，Ｗ相
は閉じているため誘発截断サージは起らない。こ
の場合、Ｖ，Ｗ相のしや断点はB₂点になる。 In other words, if the opening of the first phase is the U phase as shown in Fig. 4A, even if the firing current is multiplied by the V and W phases at point A, the current will be reduced at points A' and P' after 1/3 cycle. Since the contacts are opened, the V and W phases are certainly closed while the firing current is being applied, so no induced cutting surge occurs. In this case, the sheath breakpoints of the V and W phases are at point _B2 .

次にＵ相では発弧サージが生じないような位相
Ｏ〜P₁点のうち例えばP₂点でＵ相の開極が行わ
れたとすると、Ｖ，Ｗ相の開極遅れが1/3サイク
ルより少い場合、例えばP′₂点でＶ相が開極する。
この時Ｖ相ではアーク時間が短いので発弧現象が
起り、Ｕ，Ｗ相に発弧電流が乗じ強制電流零点が
生じる1/3サイクル後に開極すれば、Ｕ相の開極
がＯ〜P₁点のいかなる点で開極してもＶ，Ｗ相
の開極はO′点、P′点より後になり、Ｖ，Ｗ相での
電流零点はＵ相の電流零点より後になる。このた
めＵ相のしや断点はＡ点になり、Ｖ，Ｗ相のしや
断点はB₁，B₂点になる。 Next, if the U phase is opened at, for example, P ₂ points among _{the 1} points of the phase O to P where no firing surge occurs in the U phase, the opening delay of the V and W phases will be 1/3 cycle. If it is smaller, the V phase opens at the _P'2 point, for example.
At this time, since the arc time is short in the V phase, an arcing phenomenon occurs, and if the U and W phases are multiplied by the firing current and the forced current zero point is opened after 1/3 cycle, the U phase will open from O to P. No matter _which point is opened, the opening of the V and W phases will be after the O' and P' points, and the zero current point of the V and W phases will be after the current zero point of the U phase. Therefore, the edge breaking point of the U phase becomes point A, and the edge breaking points of the V and W phases become points _B1 and _B2 .

Ｈ 発明の効果 以上説明したように本発明は、第１相、第２
相、第３相に対応する第１、第２、第３の真空ス
イツチを備えた真空電磁接触器において、第１の
真空スイツチに第１の操作レバーと第１のラツチ
部を連設し、第２、第３の真空スイツチに第２の
操作レバーと第２のラツチ部を連設してこれらを
１個の操作電磁石と１個の引外し電磁石によつて
三相同時に投入すると共に、しや断時は第１相の
開極と第２、第３相の開極に時間差を持たせるよ
うにしたから、誘発截断サージの発生を防止でき
小型で高性能、高信頼性の真空電磁接触を得るこ
とができる。H. Effect of the invention As explained above, the present invention has advantages in the first phase and the second phase.
In a vacuum electromagnetic contactor equipped with first, second, and third vacuum switches corresponding to a phase and a third phase, a first operating lever and a first latch part are connected to the first vacuum switch, A second operating lever and a second latch are connected to the second and third vacuum switches, and the three phases are turned on simultaneously by one operating electromagnet and one tripping electromagnet. When disconnecting or disconnecting, there is a time difference between the opening of the first phase and the opening of the second and third phases, which prevents the occurrence of induced cutting surges.A compact, high-performance, highly reliable vacuum electromagnetic contact. can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例に係る真空電磁接触器
の正面図、第２図はラツチ機構の斜視図、第３図
および第４図は第１図の真空電磁接触器の動作特
性図、第５図は従来の真空電磁接触器の正面図、
第６図は側面図、第７図はラツチ部の構成図、第
８図は等価回路図、第９図は従来の真空電磁接触
器の特性図である。 １Ａ，１Ｂ，１Ｃ……真空スイツチ、３ａ，３
ｂ，３ｃ……可動リード、８ａ……第１の操作レ
バー、８ｂ……第２の操作レバー、９……操作
軸、１０ａ……第１の可動鉄心、１０ｂ……第２
の可動鉄心、１０ｃ……可動鉄心アーム、１１ａ
……第１の操作電磁石、１１ｂ……第２の操作電
磁石、１３ａ……第１のしや断バネ、１３ｂ……
第２のしや断バネ、３０ａ……第１の操作アー
ム、３０ｂ……第２の操作アーム、３２ａ……第
１のフツク、３２ｂ……第２のフツク、３４……
引外し電磁石、３５……可動鉄心、３６Ａ……第
１の操作部、３６Ｂ……第２の操作部、３７Ａ…
…第１のラツチ部、３７Ｂ……第２のラツチ部。 FIG. 1 is a front view of a vacuum electromagnetic contactor according to an embodiment of the present invention, FIG. 2 is a perspective view of a latch mechanism, and FIGS. 3 and 4 are operational characteristic diagrams of the vacuum electromagnetic contactor of FIG. 1. Figure 5 is a front view of a conventional vacuum electromagnetic contactor.
6 is a side view, FIG. 7 is a configuration diagram of the latch portion, FIG. 8 is an equivalent circuit diagram, and FIG. 9 is a characteristic diagram of a conventional vacuum electromagnetic contactor. 1A, 1B, 1C...Vacuum switch, 3a, 3
b, 3c...Movable lead, 8a...First operating lever, 8b...Second operating lever, 9...Operation shaft, 10a...First movable iron core, 10b...Second
Movable iron core, 10c...Movable iron core arm, 11a
...First operating electromagnet, 11b... Second operating electromagnet, 13a... First bow spring, 13b...
Second bow spring, 30a...first operating arm, 30b...second operating arm, 32a...first hook, 32b...second hook, 34...
Tripping electromagnet, 35...movable iron core, 36A...first operating section, 36B...second operating section, 37A...
...first latch part, 37B...second latch part.

Claims (1)

【特許請求の範囲】 １ 三相電力を投入しや断する第１の真空スイツ
チ、第２の真空スイツチおよび第３の真空スイツ
チを備えた開閉部と、該開閉部を投入、しや断命
令に応答して開閉操作する開閉操作部とからなる
真空開閉器において、 前記開閉操作部が、前記開閉部の第１の真空ス
イツチを開閉操作する第１の操作部と、前記第
２、第３の真空スイツチを開閉操作する第２の操
作部とからなり、 前記第１の操作部が、前記投入、しや断命令に
応答して動作する操作電磁石および第１のしや断
バネと、前記しや断命令に応答して前記第１の真
空スイツチの投入状態を解除する第１のラツチ部
とからなり、 前記第２の操作部が前記しや断命令に応答し前
記操作電磁石に関連して動作する第２のしや断バ
ネと、前記第２、第３の真空スイツチの投入状態
を保持する第２のラツチ部とを備え、 前記第１のラツチ部が、第１のフツクと、前記
しや断命令に応答して動作する引外し電磁石の可
動鉄心に連設され前記第１のフツクから所定距離
を置いて対設された第１の作動アームとによつて
構成され、 前記第２のラツチ部が、第２のフツクと、前記
引外し電磁石の引外し鉄心に連設され前記第２の
フツクから所定距離を置いて対設された第２の作
動アームとからなり、 前記第１のフツクと第１の作動アーム間の距離
を前記第２のフツクと第２の作動アーム間の距離
よりも小となるように設定して構成したことを特
徴とする真空開閉器。[Claims] 1. An opening/closing unit including a first vacuum switch, a second vacuum switch, and a third vacuum switch that turn on and off three-phase power, and an instruction to turn on and off the opening/closing unit. A vacuum switch comprising an opening/closing operation section that opens and closes a first vacuum switch of the opening/closing section, and a first operation section that opens and closes a first vacuum switch of the opening/closing section; a second operating section for opening and closing the vacuum switch; a first latch part that releases the closed state of the first vacuum switch in response to a shunt command, and a second operating part that releases the closed state of the first vacuum switch in response to a shunt command; a second latch portion that maintains the closed state of the second and third vacuum switches; the first latch portion is connected to a first hook; a first actuating arm connected to a movable core of a tripping electromagnet that operates in response to the shunting command and opposed to the first hook at a predetermined distance; The second latch portion includes a second hook and a second actuation arm that is connected to the tripping core of the tripping electromagnet and opposed to the tripping electromagnet at a predetermined distance from the second hook; A vacuum switch characterized in that the distance between the first hook and the first actuating arm is set to be smaller than the distance between the second hook and the second actuating arm.