JPH0770277B2 - High-voltage load switch - Google Patents
High-voltage load switchInfo
- Publication number
- JPH0770277B2 JPH0770277B2 JP23672790A JP23672790A JPH0770277B2 JP H0770277 B2 JPH0770277 B2 JP H0770277B2 JP 23672790 A JP23672790 A JP 23672790A JP 23672790 A JP23672790 A JP 23672790A JP H0770277 B2 JPH0770277 B2 JP H0770277B2
- Authority
- JP
- Japan
- Prior art keywords
- thyristor
- opening
- switch
- closing
- voltage
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電源と負荷との間の電路を開閉するようにし
てある高圧負荷開閉器に関する。TECHNICAL FIELD The present invention relates to a high-voltage load switch which is adapted to open and close an electric path between a power source and a load.
電源側端子と負荷側端子との間に、互いに逆並列接続し
たサイリスタを接続して、上記サイリスタの導通により
電源側から負荷側への通電を行ない、上記サイリスタを
遮断することにより上記通電を停止するようにしたもの
がある。A thyristor connected in anti-parallel with each other is connected between the power supply side terminal and the load side terminal, the power supply side is energized by the conduction of the thyristor, and the energization is stopped by shutting off the thyristor. There are things I tried to do.
この従来の高圧負荷開閉器では、負荷側への通電の場
合、電流が上記サイリスタに連続的に流れる為、サイリ
スタで生ずる損失が非常に大きいという問題点がある。
この為サイリスタの発熱量が大きくてその冷却の為に大
規模な冷却装置が必要となったり、大容量の高価なサイ
リスタが必要になったりする問題点があった。また上記
サイリスタが遮断となって負荷側への通電を停止した場
合においても、負荷側は上記サイリスタを介して電源側
へつながっている為、上記サイリスタに漏れ電流がある
と負荷側が加電状態となってそこでの作業の場合に感電
事故を起こしたりする問題点もあった。This conventional high-voltage load switch has a problem that, when the load side is energized, a current continuously flows through the thyristor, so that the loss generated in the thyristor is very large.
Therefore, there is a problem that a large amount of heat is generated in the thyristor, a large-scale cooling device is required for cooling the thyristor, and a large-capacity expensive thyristor is required. Further, even when the thyristor is cut off and the energization to the load side is stopped, the load side is connected to the power supply side through the thyristor. There was also the problem that an electric shock accident could occur when working there.
本願発明は上記従来技術の問題点（技術的課題）を解決
する為になされたもので、常態での通電は機械的な開閉
部を通して行ない、サイリスタの通電は上記開閉部の開
又は閉を行なう場合の一時的にのみ行なえばよくするこ
とによって、サイリスタで生ずる損失を著しく低減させ
ることができ、しかも通電の停止時には負荷側を電源側
から完全に切り離すことができて、負荷側での安全作業
を可能にできるようにした高圧負荷開閉器を提供するこ
とを目的としている。The present invention has been made in order to solve the above-mentioned problems (technical problems) of the prior art. In the normal state, energization is performed through a mechanical opening / closing part, and energization of a thyristor opens or closes the opening / closing part. By doing this only temporarily, the loss generated in the thyristor can be significantly reduced, and the load side can be completely disconnected from the power source side when the energization is stopped. It is an object of the present invention to provide a high-voltage load switch that enables the above.
本願発明における高圧負荷開閉器は、電源側端子と負荷
側端子との間に、互いに逆並列接続したサイリスタと、
第１の機械的な開閉部とを直列に接続し、上記逆並列接
続したサイリスタには、第２の機械的な開閉部を並列接
続した高圧負荷開閉器において、上記開閉器の開放時に
は第２の開閉部を開放した後サイリスタを導通させ、続
いて同サイリスタを非導通にした状態で第１の開閉部を
開放する一方、閉路時には、第１の開閉部を閉路した後
サイリスタを導通させ、次いで第２の開閉部を閉路して
サイリスタを非導通とするようにしたものである。The high-voltage load switch according to the present invention, between the power supply side terminal and the load side terminal, a thyristor connected in reverse parallel to each other,
A high-voltage load switch in which a first mechanical switch is connected in series and the second mechanical switch is connected in parallel to the thyristor connected in anti-parallel, and a second switch is opened when the switch is opened. After opening the opening / closing part, the thyristor is made conductive, and then the first opening / closing part is opened while the same thyristor is made non-conductive, while at the time of closing, the thyristor is made conductive after closing the first opening / closing part, Then, the second opening / closing part is closed to make the thyristor non-conductive.
常態において電源側から負荷側へは第２の開閉部を通し
て通電される。上記通電を停止する場合、第２の開閉部
が開かれる。第２の開閉部が開かれた場合、サイリスタ
が導通して、上記第２の開閉部におけるアークの発生が
抑制される。その結果第２の開閉部の損傷が防止され
る。上記サイリスタは導通後短時間で遮断される。サイ
リスタの遮断の後、第１の開閉部が開放され、負荷側は
電源側から完全に切り離される。In the normal state, electricity is supplied from the power supply side to the load side through the second opening / closing section. When the energization is stopped, the second opening / closing part is opened. When the second opening / closing section is opened, the thyristor is brought into conduction, and generation of an arc in the second opening / closing section is suppressed. As a result, damage to the second opening / closing portion is prevented. The thyristor is cut off in a short time after conduction. After the thyristor is cut off, the first opening / closing part is opened, and the load side is completely disconnected from the power supply side.
次に本願の実施例を説明するに先立って、実施例を理解
する為に必要なアークの消弧の原理を第１図及び第２図
に基づいて説明する。第１図において、１は単相乃至三
相の交流電源、２は負荷、３は電源と負荷との間に介設
した高圧負荷開閉器を示す。これにおいて3aは金属等か
らなる密閉ケース、４は電源側端子、５は負荷側端子、
６はケース内に備えられた開閉部を示し、周知の如く固
定電極（固定接点）７とそれに接離する可動電極（可動
接点）８とからなる。次に9,10は高耐圧、大電流用のサ
イリスタで、図示される如く逆並列に接続してあり、そ
れらを上記固定電極７と可動電極８との間に並列に接続
してある。9a,10aはトリガ端子（ゲート）を示す。11は
主回路5aに装着した変流器（CT）で、主回路の電流を検
出してパルス発生器12に向けて電気信号を発するように
したものである。変流器11によって検出した信号はパル
ス発生器12によりパルス信号に変換して上記サイリスタ
9,10のゲートに加えるようにしてあり、主回路、つまり
量電極間に電流が流れている場合は常時ゲートに対し信
号を与え続けるようになっている。なお、上記において
パルス発生器12は充電式バッテリまたは別電源、例えば
電源を降圧してAC100Vで駆動させるようにしてもよい。Prior to describing the embodiments of the present application, the principle of arc extinction necessary for understanding the embodiments will be described with reference to FIGS. 1 and 2. In FIG. 1, 1 is a single-phase to three-phase AC power supply, 2 is a load, and 3 is a high-voltage load switch provided between the power supply and the load. In this, 3a is a sealed case made of metal or the like, 4 is a power supply side terminal, 5 is a load side terminal,
Reference numeral 6 denotes an opening / closing portion provided in the case, which is composed of a fixed electrode (fixed contact) 7 and a movable electrode (movable contact) 8 which is brought into contact with and separated from the fixed electrode 7 as is well known. Next, 9 and 10 are thyristors for high withstand voltage and large current, which are connected in antiparallel as shown in the drawing, and they are connected in parallel between the fixed electrode 7 and the movable electrode 8. 9a and 10a indicate trigger terminals (gates). Reference numeral 11 is a current transformer (CT) attached to the main circuit 5a, which detects the current in the main circuit and emits an electric signal to the pulse generator 12. The signal detected by the current transformer 11 is converted into a pulse signal by the pulse generator 12 and is converted into the above thyristor.
It is designed to be added to the gates of 9 and 10, and when the current is flowing between the main circuit, that is, the quantity electrodes, the signal is always given to the gate. In the above, the pulse generator 12 may be driven by a rechargeable battery or another power source, for example, a power source which is stepped down and AC100V.
上記構成のものにあっては、開閉部６において固定電極
７と可動電極８とが接続された状態においては、交流電
源１からの交流電力はその開閉部６を通って負荷２に供
給される（第２図の（ニ）図の波形参照）。In the configuration described above, when the fixed electrode 7 and the movable electrode 8 are connected to each other in the opening / closing section 6, the AC power from the AC power supply 1 is supplied to the load 2 through the opening / closing section 6. (See the waveform in FIG. 2D).
次に開閉部６を開放する時の動作を説明する。可動電極
８が手動操作により動かされて固定電極７から離反し始
めると、それらの間にアーク40が発生し始める。この
間、第２図の（ホ）図のように変流器11、パルス発生器
12からはサイリスタ9,10のトリガ端子9a,10aにトリガ信
号igを与え続けている。するとサイリスタ９及び10は、
固定電極７と可動電極８との間のその時の電気的な極性
に応じて、その何れか一方が上記アーク40の発生による
アーク電圧によって導通する（なおアーク電圧はアーク
発生後、サイリスタの最低動作電圧にすぐ達する）。従
って端子4,5の間においてはその導通した側のサイリス
タによって通電が行われ、固定電極７と可動電極８との
間は無電圧となって上記アークが消滅する。この場合主
回路5aの電流は０となる為トリガ信号igの発生は無くな
る。やがて電源１の位相が０゜又は180゜となって端子
4,5間が０ボルトになると、上記の如くトリガ信号が既
に無くなっている為、上記導通したサイリスタ９又は10
はオフとなる。上記初期アークが消されて上記のように
サイリスタがオフとなるまでの間において周知の如く可
動電極８は固定電極７から充分に離間させられている
為、上記サイリスタ９又は10がオフとなる事によって端
子4,5間は電気的に完全に遮断され、負荷２への電源供
給が断たれる。尚上記サイリスタ9,10には長くても半波
しか電流が流れない為、電流定格（容量）の小さなもの
（例えば30A・瞬時通電は600A程度まで可能）で足り
る。なお動作中の波形は第２図の（ホ）図参照。Next, the operation of opening the opening / closing portion 6 will be described. When the movable electrode 8 is manually moved to start moving away from the fixed electrode 7, an arc 40 starts to be generated therebetween. During this period, as shown in Fig. 2 (e), current transformer 11 and pulse generator
From 12, the trigger signal ig is continuously applied to the trigger terminals 9a and 10a of the thyristors 9 and 10. Then the thyristors 9 and 10
Depending on the electrical polarity at that time between the fixed electrode 7 and the movable electrode 8, either one of them becomes conductive by the arc voltage generated by the arc 40 (the arc voltage is the minimum operation of the thyristor after the arc is generated). Reach the voltage soon). Therefore, between the terminals 4 and 5, electricity is conducted by the thyristor on the conducting side, and there is no voltage between the fixed electrode 7 and the movable electrode 8, and the arc is extinguished. In this case, since the current of the main circuit 5a becomes 0, the trigger signal ig is not generated. Eventually the phase of power supply 1 becomes 0 ° or 180 ° and the terminal
When the voltage between 4 and 5 becomes 0 volt, the trigger signal has already disappeared as described above, so that the thyristor 9 or 10 which has been conducted is made conductive.
Turns off. As is well known, the movable electrode 8 is sufficiently separated from the fixed electrode 7 until the initial arc is extinguished and the thyristor is turned off as described above. Therefore, the thyristor 9 or 10 is turned off. As a result, the terminals 4 and 5 are electrically cut off completely, and the power supply to the load 2 is cut off. Since only half-wave current flows through the thyristors 9 and 10 for a long time, a small current rating (capacity) (for example, 30 A, instantaneous energization up to about 600 A is sufficient) is sufficient. For the waveforms during operation, see Fig. 2 (e).
また、今とは逆に開放状態つまり、電路の開放状態より
閉路する場合は次のようになる。即ち図示外の操作ハン
ドルを閉路すべく操作すると可動電極８が逆に動いて固
定電極７に接近するため両者間ではアーク放電が発生
し、アーク電流が流れる。するとこの電流は変流器11で
直ちに検出され、サイリスタ9,10のゲートにはこのトリ
ガー用の信号が与えられる。同時に上記の如くサイリス
タにはアーク電圧により電圧が印加されているためサイ
リスタは点弧し、電流はサイリスタに流れる。そして上
記アーク電圧は時間の経過（可動接点の固定接点に対す
る接近）とともになくなり、電流は両電極間にのみ流れ
て通常の電路となる（第２図（ヘ）図の波形参照）。On the contrary, when the circuit is closed from the open state, that is, the open state of the electric circuit, it is as follows. That is, when an operation handle (not shown) is operated to close it, the movable electrode 8 moves in the opposite direction and approaches the fixed electrode 7, so that arc discharge occurs between the two and an arc current flows. Then, this current is immediately detected by the current transformer 11, and the signals for this trigger are given to the gates of the thyristors 9 and 10. At the same time, since the voltage is applied to the thyristor by the arc voltage as described above, the thyristor is ignited and the current flows through the thyristor. Then, the arc voltage disappears with the lapse of time (the movable contact approaches the fixed contact), and the current flows only between the electrodes to form a normal electric path (see the waveform in FIG. 2 (f)).
次に本願の実施例を示す第３図について説明する。図に
おいて21,22はブッシングで、磁器或いはエポキシ樹脂
で形成される。23は電源側端子4fに固定した導電材製の
取付片で、これにはサイリスタ9f,10fが取付けてある。
尚サイリスタ9fと10fは紙面と垂直な方向に並設され、
かつ、逆並列接続された状態で、上記開閉器の電気的な
接続を示す第４図における（Ａ）図（第３図の状態に対
応する図）のように、両電極7f,8f間に並列に接続され
ている。上記サイリスタ9fにおいて、24はアノード、25
はカソードを示す。また両サイリスタのゲート（図示し
ない）にはパルス発生器からのトリガー用の信号が与え
られるように接続されている。11fは主回路5afに流れる
電流を検出する変流器（CT）であり、この検出した信号
を図示外のパルス発生器を経てサイリスタのゲートに対
しトリガー用の信号として継続的に与えるようにしたも
ので、電源のブッシング21の外周にブッシングを貫通さ
せる状態に取付けられている。次に、電源側端子4fと負
荷側端子5fとの間においては、上記逆並列接続したサイ
リスタ9f,10fと直列に第１の機械的な開閉部S1が接続さ
れており、また上記逆並列接続したサイリスタ9f,10fに
は第２の機械的な開閉部S2が並列接続されている。即
ち、27は取付片23に固定した絶縁材製の支持体で、可動
電極8fに弾力的に接触する補助接触片28が取付けてあ
る。29は接続片を示す。上記可動電極8fと補助接触片28
により第１の機械的な開閉部S1が構成され、固定電極7f
と可動電極8fにより第２の機械的な開閉部S2が構成され
ている。次に30はチューリップ形の固定電極7fに周設し
た引締め用のコイルスプリングである。31は図示外の操
作ハンドルに連らなる開閉用の操作軸で、開閉用レバー
32が取付けてありレバー32の矢印方向への揺動によって
可動電極8fが矢印方向に直線運動するようになってい
る。尚本例においては、負荷側の接続端子5fとしてチュ
ーリップ形のものが用いてあり、コイルスプリング34に
よって引き締められている。Next, FIG. 3 showing an embodiment of the present application will be described. In the figure, 21 and 22 are bushings, which are made of porcelain or epoxy resin. Reference numeral 23 is a mounting piece made of a conductive material, which is fixed to the power source side terminal 4f, to which thyristors 9f and 10f are mounted.
The thyristors 9f and 10f are arranged side by side in a direction perpendicular to the paper surface,
In addition, as shown in FIG. 4A (the diagram corresponding to the state of FIG. 3) in FIG. 4 showing the electrical connection of the switches in the state of being connected in anti-parallel, between the electrodes 7f, 8f. It is connected in parallel. In the above thyristor 9f, 24 is an anode, 25
Indicates a cathode. Further, gates (not shown) of both thyristors are connected so that a trigger signal from a pulse generator is given. Reference numeral 11f is a current transformer (CT) that detects the current flowing in the main circuit 5af, and the detected signal is continuously given to the gate of the thyristor as a trigger signal via a pulse generator (not shown). It is attached to the outer periphery of the bushing 21 of the power supply in a state where the bushing penetrates. Next, between the power source side terminal 4f and the load side terminal 5f, the first mechanical switching unit S1 is connected in series with the thyristors 9f and 10f connected in antiparallel, and the antiparallel connection is also performed. A second mechanical switch S2 is connected in parallel to the thyristors 9f and 10f. That is, 27 is a support made of an insulating material fixed to the attachment piece 23, and an auxiliary contact piece 28 that elastically contacts the movable electrode 8f is attached. 29 indicates a connecting piece. The movable electrode 8f and the auxiliary contact piece 28
The first mechanical opening / closing part S1 is constituted by the fixed electrode 7f
The movable electrode 8f constitutes a second mechanical opening / closing section S2. Next, 30 is a coil spring for tightening which is provided around the tulip-shaped fixed electrode 7f. Reference numeral 31 is an opening / closing operation shaft connected to an operation handle (not shown).
32 is attached and the movable electrode 8f is linearly moved in the direction of the arrow by swinging the lever 32 in the direction of the arrow. In this example, a tulip-shaped connection terminal 5f is used as the connection terminal 5f on the load side and is tightened by the coil spring 34.
次に上記構成の高圧負荷開閉器の動作を第３図並びに第
４図に基づき説明する。第３図及び第４図（Ａ）に示さ
れる如き投入状態において、電流は電源側端子4f、固定
電極7f、可動電極8f、負荷側端子5fの主回路5afに流れ
る。そして変流器11fと図示外のパルス発生器から成る
トリガー信号発生器からはトリガー用の信号が上記サイ
リスタに常時流れている。Next, the operation of the high-voltage load switch having the above structure will be described with reference to FIGS. In the closed state as shown in FIGS. 3 and 4 (A), a current flows through the main circuit 5af of the power source side terminal 4f, the fixed electrode 7f, the movable electrode 8f, and the load side terminal 5f. A trigger signal generator, which is composed of the current transformer 11f and a pulse generator (not shown), constantly supplies a trigger signal to the thyristor.
上記高圧負荷開閉器を開放する場合の動作は次の通りで
ある。上記状態において、操作軸31の開放操作により可
動電極8fが図の状態から右方へ移動し始め、第２の開閉
部S2が開くと、即ち、第４図（Ｂ）の如く先端33が固定
電極7fから離れると、先端33と固定電極7fとの間にアー
ク40fが発生し始める。そのアークのアーク電圧はサイ
リスタがまだ固定補助接触片28を介して可動電極8fに接
続しているためサイリスタに印加される。そしてその電
圧が最低動作電圧に達するとサイリスタは直ちに導通状
態即ちオン状態となり、導サイリスタに電流は移行す
る。つまり、アーク電圧が発生した状態においては主回
路には依然としてアーク電流が流れているため、変流器
11fがこの電流を検出してゲートにはトリガー用の信号
を与え続けており、上記の如くアーク電圧がサイリスタ
の最低動作電圧に達すると直ちに同サイリスタはオン状
態となる。そして接続端子4fと可動電極8fとの間におい
ては取付片23、サイリスタ9f（又は10f）、接続片29、
補助接触片28を通る経路で通電がなされる。その結果、
固定電極7fと可動電極8fの先端33との間は無電圧とな
り、上記アークが消滅する。The operation of opening the high-voltage load switch is as follows. In the above state, when the operation shaft 31 is opened, the movable electrode 8f starts to move to the right from the state shown in the figure and the second opening / closing part S2 opens, that is, the tip 33 is fixed as shown in FIG. 4 (B). When separated from the electrode 7f, an arc 40f starts to be generated between the tip 33 and the fixed electrode 7f. The arc voltage of the arc is applied to the thyristor because the thyristor is still connected to the movable electrode 8f via the fixed auxiliary contact piece 28. When the voltage reaches the minimum operating voltage, the thyristor is immediately turned on, that is, turned on, and the current is transferred to the conductive thyristor. In other words, when the arc voltage is generated, the arc current is still flowing in the main circuit.
11f detects this current and continues to give a signal for triggering to the gate, and as described above, the thyristor is turned on as soon as the arc voltage reaches the minimum operating voltage of the thyristor. Then, between the connection terminal 4f and the movable electrode 8f, a mounting piece 23, a thyristor 9f (or 10f), a connection piece 29,
Electric power is supplied along the path passing through the auxiliary contact piece 28. as a result,
There is no voltage between the fixed electrode 7f and the tip 33 of the movable electrode 8f, and the arc is extinguished.
やがて電源の位相が０゜又は180゜となるとサイリスタ9
f（又は10f）は非導通となり、接続端子4f,5f間の通電
が遮断される。When the phase of the power supply eventually becomes 0 ° or 180 °, the thyristor 9
f (or 10f) becomes non-conductive, and the conduction between the connection terminals 4f and 5f is cut off.
更に引き続いて可動電極8fが右方へ移動することにより
やがて第１の開閉部S1が開くと、即ち、第４図（Ｃ）の
如くその先端33が補助接触片28から離れると、その時に
は既にサイリスタ9f（又は10f）が非導通即ちオフとな
っている為、先端33が補助接触片28から離れてもそこで
アークが生ずるようなことは無い。このようにして先端
33が第３図に想像線で示される如き位置まで至ることに
より、接続端子4f、5f間は電気的、機械的に完全に開放
された状態となる。When the movable electrode 8f is further moved to the right and the first opening / closing part S1 is eventually opened, that is, when the tip 33 is separated from the auxiliary contact piece 28 as shown in FIG. Since the thyristor 9f (or 10f) is non-conducting, that is, off, even if the tip 33 separates from the auxiliary contact piece 28, an arc does not occur there. In this way the tip
When 33 reaches the position shown by the imaginary line in FIG. 3, the connection terminals 4f and 5f are completely opened electrically and mechanically.
一方開閉器を閉路即ち投入する場合においては、可動電
極8fの先端33が第３図に想像線で示される位置から左方
へ移動してくると先ず第１の開閉部S1が閉路する。即ち
可動電極8fの先端33が補助接触片28に接触する。この場
合、サイリスタはオフとなっている為、何等の現象も生
じない。やがて先端33が固定電極7fに極めて近接すると
両者間において先行放電のアークが発生する。このアー
クの発生によって主回路5af（両接点）には電流が流
れ、この電流は変流器11fによって検出され、検出され
た信号はサイリスタのゲートに対しトリガー用の信号と
して継続的に与えられる。また同時にアーク電圧がサイ
リスタに印加され、それが最低動作電圧に達するとサイ
リスタは直ちに導通状態となり電流はサイリスタに移行
する。そして可動電極8fが更に左方に動いて第２の開閉
部S2が閉路すると、即ち先端33が固定電極7fに完全に接
触すると極間電圧が０となり、サイリスタに流れる電流
がその保持電流以下となってサイリスタは非導通状態と
なる。この状態において、電流は電源側端子4f、固定電
極7f、可動電極8f、負荷側端子5fの主回路に流れる状態
となる。On the other hand, when closing or closing the switch, when the tip 33 of the movable electrode 8f moves to the left from the position shown by the imaginary line in FIG. 3, the first switch S1 first closes. That is, the tip 33 of the movable electrode 8f contacts the auxiliary contact piece 28. In this case, since the thyristor is off, no phenomenon occurs. When the tip 33 comes very close to the fixed electrode 7f, an arc of preceding discharge is generated between the two. A current flows through the main circuit 5af (both contacts) by the generation of this arc, this current is detected by the current transformer 11f, and the detected signal is continuously given to the gate of the thyristor as a signal for triggering. At the same time, an arc voltage is applied to the thyristor, and when it reaches the minimum operating voltage, the thyristor immediately becomes conductive and current flows to the thyristor. When the movable electrode 8f further moves to the left and the second opening / closing part S2 is closed, that is, when the tip 33 completely contacts the fixed electrode 7f, the inter-electrode voltage becomes 0, and the current flowing through the thyristor becomes less than the holding current. Then the thyristor becomes non-conductive. In this state, the current flows into the main circuit of the power supply side terminal 4f, the fixed electrode 7f, the movable electrode 8f, and the load side terminal 5f.
なお、機能上前図のものと同一又は均等構成と考えられ
る部分には、前図と同一の符号にアルファベットのｆを
付して重複する説明を省略した。It should be noted that the parts that are considered to have the same or equivalent configurations as those in the previous figure in terms of function are denoted by the same reference numerals as in the previous figure with the letter f attached, and redundant description is omitted.
以上のように本願発明にあっては、負荷側への通電の場
合、第２の機械的な開閉部S2を閉じて通電できるは勿論
のこと、 そのような機械的な開閉部S2を用いたものでも、上記通
電の開始あるいは停止の為に第２の開閉部S2を閉じたり
あるいは開くときには、サイリスタ9f又はサイリスタ10
fを導通させることにより、第２の開閉部S2のアークに
よる損傷を防止できる効果がある。As described above, according to the present invention, in the case of energizing the load side, it is of course possible to close the second mechanical opening / closing section S2 for energization, and such a mechanical opening / closing section S2 is used. However, when closing or opening the second opening / closing part S2 for starting or stopping the energization, the thyristor 9f or the thyristor 10
By making f conductive, there is an effect that damage to the second opening / closing portion S2 due to an arc can be prevented.
しかも上記のようにサイリスタ9f,10fを用いていても、
上記通電時には上記の如く通電は第２の開閉部S2を通し
て行なわれてサイリスタ9f,10fには電流が流れず、サイ
リスタ9f,10fの通電は上記第２の開閉部S2の開又は閉の
場合に一時的に行なわれればよいから、サイリスタで生
ずる損失を著しく小さくできる特長がある。このことは
サイリスタの発熱を小さくできることであってそれ用の
冷却装置を不要にできる効果があると共に、小容量のサ
イリスタが利用可能となってコストダウンを図り得る効
果がある。Moreover, even if the thyristors 9f and 10f are used as described above,
During the energization, the energization is performed through the second opening / closing part S2 as described above and no current flows in the thyristors 9f, 10f. The energization of the thyristors 9f, 10f occurs when the second opening / closing part S2 is opened or closed. Since it may be performed temporarily, it has a feature that the loss generated in the thyristor can be significantly reduced. This has the effect that the heat generation of the thyristor can be made small and the cooling device therefor can be made unnecessary, and at the same time, a small capacity thyristor can be used and the cost can be reduced.
しかも上記のようにサイリスタを用いたものであって
も、上記通電の停止後は第１の機械的な開閉部S1を開く
ことによって電源側と負荷側とを機械的に完全に切り離
せるから、例えサイリスタに漏れ電流が生ずる可能性が
あっても、その漏れ電流によって負荷側に高電圧が加わ
ることを防止できて、負荷側での作業を安全化できる利
点がある。Moreover, even if a thyristor is used as described above, the power supply side and the load side can be mechanically completely separated by opening the first mechanical switching unit S1 after the stop of the energization. Even if a leakage current may occur in the thyristor, there is an advantage that a high voltage can be prevented from being applied to the load side due to the leakage current and the work on the load side can be made safe.
第１図は開閉器の電極に生ずるアークの消弧の原理を説
明する為の回路図、第２図は同原理を説明する為の波形
図、第３図は本願の実施例を示す高圧負荷開閉器の縦断
面図、第４図は第３図の開閉器の動作説明用回路図。 １……電源、２……負荷、７……固定電極、８……可動
電極、9,10……サイリスタ、S1……第１の開閉部、S2…
…第２の開閉部。FIG. 1 is a circuit diagram for explaining the principle of extinguishing an arc generated in an electrode of a switch, FIG. 2 is a waveform diagram for explaining the same principle, and FIG. 3 is a high voltage load showing an embodiment of the present application. FIG. 4 is a vertical sectional view of the switch, and FIG. 4 is a circuit diagram for explaining the operation of the switch of FIG. 1 ... power supply, 2 ... load, 7 ... fixed electrode, 8 ... movable electrode, 9,10 ... thyristor, S1 ... first opening / closing part, S2 ...
… Second opening / closing part.
Claims (1)
逆並列接続したサイリスタと、第１の機械的な開閉部と
を直列に接続し、上記逆並列接続したサイリスタには、
第２の機械的な開閉部を並列接続した高圧負荷開閉器に
おいて、上記開閉器の開放時には第２の開閉部を開放し
た後サイリスタを導通させ、続いて同サイリスタを非導
通にした状態で第１の開閉部を開放する一方、閉路時に
は、第１の開閉部を閉路した後サイリスタを導通させ、
次いで第２の開閉部を閉路してサイリスタを非導通とす
るようにしたことを特徴とする高圧負荷開閉器。1. A thyristor connected in antiparallel to each other between a power supply side terminal and a load side terminal and a first mechanical switching unit are connected in series, and the thyristor connected in antiparallel is
In a high-voltage load switch in which a second mechanical switch is connected in parallel, when the switch is opened, the thyristor is turned on after the second switch is opened, and then the thyristor is turned off. On the other hand, while opening the opening / closing part of 1, while closing the circuit, the thyristor is made conductive after closing the first opening / closing part,
Next, the high-voltage load switch is characterized in that the thyristor is made non-conductive by closing the second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23672790A JPH0770277B2 (en) | 1990-09-05 | 1990-09-05 | High-voltage load switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23672790A JPH0770277B2 (en) | 1990-09-05 | 1990-09-05 | High-voltage load switch |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10324285A Division JPS61260516A (en) | 1985-05-15 | 1985-05-15 | Arc extinguishing for high pressure load switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03129614A JPH03129614A (en) | 1991-06-03 |
| JPH0770277B2 true JPH0770277B2 (en) | 1995-07-31 |
Family
ID=17004893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23672790A Expired - Lifetime JPH0770277B2 (en) | 1990-09-05 | 1990-09-05 | High-voltage load switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0770277B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2541194Y2 (en) * | 1991-10-03 | 1997-07-09 | 日新電機株式会社 | Semiconductor circuit breaker |
| DE112009005004T5 (en) * | 2009-06-25 | 2012-06-21 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | LOW FREQUENCY CIRCUIT BREAKER |
| PL2523203T3 (en) * | 2011-05-10 | 2019-10-31 | Abb Schweiz Ag | Switching device and related switchgear |
| DK3116007T3 (en) * | 2015-07-07 | 2018-12-17 | Abb Schweiz Ag | A SWITCH DEVICE |
-
1990
- 1990-09-05 JP JP23672790A patent/JPH0770277B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03129614A (en) | 1991-06-03 |
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