JPH03208218A - Load switch with fuse - Google Patents
Load switch with fuseInfo
- Publication number
- JPH03208218A JPH03208218A JP393890A JP393890A JPH03208218A JP H03208218 A JPH03208218 A JP H03208218A JP 393890 A JP393890 A JP 393890A JP 393890 A JP393890 A JP 393890A JP H03208218 A JPH03208218 A JP H03208218A
- Authority
- JP
- Japan
- Prior art keywords
- fuse
- lever
- load switch
- switch
- shape memory
- 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
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000003446 memory effect Effects 0.000 claims abstract description 9
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims description 5
- 230000004927 fusion Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000029052 metamorphosis Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は、ヒューズの溶断動作により機械的に負荷開閉
器の引き外し機構をトリソプさせて開閉器の電極を開極
させるようにしたヒューズ付き負荷開閉器に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a fuse-equipped device in which the tripping mechanism of a load switch is mechanically tripped by the fuse blowing operation to open the electrodes of the switch. Regarding load switch.
配電用変圧器などに用いる負荷開閉器として、負荷開閉
器に限流ヒューズなどの電力用ヒューズを組合わせたヒ
ューズ付き負荷開閉器が従来より公知であり、かつ前記
ヒエーズとして溶断表示ピンを備えたものを用い、故Ｉ
Ｉ電流が流れてヒューズが溶断した際にヒューズ本体よ
り突き出す溶断表示ピンの動作により、負荷開閉器の引
き外し機構を機械的にトリソブさせるように構成したも
のが同し出願人より特公昭６３−４０３４６号公報とし
て既に提案されている。As a load switch for use in a distribution transformer, etc., a load switch with a fuse, which is a combination of a load switch and a power fuse such as a current limiting fuse, is conventionally known, and is equipped with a blowout indicator pin as the fuse. Using things, the late I
Japanese Patent Publication No. 1983-1999 was published by the same applicant, in which the load switch tripping mechanism is mechanically tripped by the operation of a blowout indicator pin that protrudes from the fuse body when the fuse blows due to the flow of I current. This has already been proposed as Publication No. 40346.
この場合に、ヒューズは通常負荷の突入電流などによる
不要な溶断を避け、故障電流の通電時に溶断して電流を
しゃ断するために、通常はヒューズの定格電瓜が負荷ｔ
流の２〜３倍程度に選定されている。In this case, in order to avoid unnecessary blowing due to the rush current of the load, etc., and to cut off the current by blowing when the fault current is applied, the fuse's rated voltage is normally set at the load t.
It is selected to be about 2 to 3 times the current.
ところで、電力回路によっては故障ｔｉのみならず、通
常負荷の２倍前後の過負荷電流が流れた際にも過負荷保
護を必要とする場合が多い．しかして、先記したヒュー
ズ付き負荷開閉器では通常負荷の２倍程度の過負荷ｔ流
ではヒューズが溶断しない（ヒューズの最小溶断電流は
定格電流の約２倍）．そこで従来ではヒューズと別個に
変流器過電流継電器を組合わせて電気的に負荷開閉器の
引き外し機構をトリップさせるような装置を負荷開閉器
に追加装備して対処しているのが現状である。しかしな
がら、過負荷保護のために変流器，過電流ｗ１′＠器を
追加装備することは負荷開閉器の大幅なコストアップを
招く。Incidentally, depending on the power circuit, overload protection is often required not only in case of a failure ti but also when an overload current of around twice the normal load flows. However, in the above-mentioned load switch with a fuse, the fuse does not blow under an overload current of about twice the normal load (the minimum fuse current is about twice the rated current). Conventionally, the current solution is to add a device to the load switch that electrically trips the load switch tripping mechanism by combining a fuse with a separate current transformer overcurrent relay. be. However, additionally equipping a current transformer and an overcurrent w1'@ device for overload protection causes a significant increase in the cost of the load switch.
本発明は上記の点にかんがみなされたものであり、ヒュ
ーズの溶断表示ピンと負荷開閉器の引き外し！１横との
間の連結部品を改良することにより、変流器．過電流継
電器などの追加装備を要することなしに過負荷保護が行
えるようにしたヒューズ付き負荷開閉器を提供すること
を目的とする。The present invention has been made in consideration of the above points, and it is possible to remove the fuse blowout indicator pin and the load switch! By improving the connection parts between 1 and 1 side, current transformer. It is an object of the present invention to provide a load switch with a fuse that can perform overload protection without requiring additional equipment such as an overcurrent relay.
上記課題を解決するために、本発明のヒューズ付き負荷
開閉器においては、ヒューズの溶断表示ピンと開閉器引
き外しｌＩＩｉ構の操作ロソドとの間に介装した揺動レ
バーを形状記憶合金製としてレバーの一端をヒューズキ
ャップの端面に伝熱的に接触して配備し、ヒューズ溶断
ｔ流より低い過負荷電流の通電時には、形状記憶効果に
よる揺動レバー自身の変形力で負荷開閉器の引き外し４
１構をトリップさせるようｍ威ずるものとする。In order to solve the above problems, in the load switch with a fuse of the present invention, the swinging lever interposed between the fuse blowout indicator pin and the operating rod of the switch tripping mechanism is made of a shape memory alloy. One end is placed in thermal conductive contact with the end face of the fuse cap, and when an overload current lower than the fuse blowing current is applied, the load switch is tripped by the deformation force of the swing lever itself due to the shape memory effect.
Let's try to intimidate one structure into tripping.
〔作用］
前記の構成において、中央を揺動支点としたＶ字形の揺
動レバーは二方向性の形状記憶合金で作られており、常
温から高温に加熱されると形状記憶効果による変態でレ
バー自身がそのＶ字角度を開くように変形し、常温に低
下すれば再び元の形状に戻るようにあらかしめ形状が記
憶されている。[Function] In the above configuration, the V-shaped swinging lever with the center as the swinging fulcrum is made of a bidirectional shape memory alloy, and when heated from room temperature to high temperature, the lever undergoes transformation due to the shape memory effect. The shape is memorized so that it deforms itself to open its V-shaped angle, and returns to its original shape once the temperature drops to room temperature.
また、高温側への変態開始温度を過負荷電流の通電に伴
う上昇温度に対応させて設定しておく。Further, the temperature at which transformation to the high temperature side starts is set in accordance with the temperature increase caused by the application of overload current.
これにより、過負荷電流の通電時にヒューズの温度が上
昇し、その熱がヒューズのヰヤノブを通して揺動レバー
に伝熱されると揺動レバー自身が■字形を開く方向に変
形し、その変形力で開閉器の引き外し機構をトリップさ
せる。そして電流しゃ断の後に温度が常温に下がれば、
揺動レバーは再び元の形状に戻る。一方、故障電流によ
りヒューズが溶断した場合には、従来のヒューズ付き負
荷開閉器と同様に揺動レバーが溶断表示ピンの突出し動
作で揺動し、開閉器の引き外し機構をトリンブさせて電
極を開極する。つまり、変流器，過電流保護継電器など
の電気的な引き外し装置を追加装備することなく、形状
記憶合金製の揺動レバー自身の変形動作で負荷開閉器に
過負荷保護機能を与えることができる。As a result, the temperature of the fuse rises when overload current is applied, and when that heat is transferred to the swing lever through the fuse knob, the swing lever itself deforms in the direction of opening the ■ shape, and the deformation force opens and closes it. trip the device's tripping mechanism. And if the temperature drops to room temperature after the current is cut off,
The swing lever returns to its original shape. On the other hand, if the fuse blows due to a fault current, the rocking lever swings by the protruding action of the blowout indicator pin, similar to conventional fused load switches, and the switch's tripping mechanism is trimmed to remove the electrodes. Open the pole. In other words, it is possible to provide an overload protection function to the load switch through the deformation action of the shape memory alloy rocking lever itself, without the need for additional electrical tripping devices such as current transformers or overcurrent protection relays. can.
〔実施例］
第１図は本発明実施例の構或図、第２図は第１図におけ
る揺動レバーに対する形状記憶効果の動作説明図である
。[Embodiment] FIG. 1 is a schematic diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of the shape memory effect on the swing lever in FIG. 1.
まず、ヒューズ付き負荷開閉器の全体構造を第１図で述
べる，図において，１は開閉器のヘース仮、２は支持碍
子、３．４は各碍子２に設けた端子金具、５は一方の端
子金具３に接続した固定電極、６は一端を他方の碍子２
にヒンジ結合したヒューズ保持具、７はヒューズ保持具
６に搭載した溶断表示ピン内蔵形のヒューズ、８，９は
ヒューズ７の両端キャンプ７ａに結合したコンタクト、
１０はコンタクト９に連ねて前記の固定電極５と接触す
る可動電極、１１は消弧室である。一方、可動電極１０
を開極させる開閉器の引き外し機構は、べ一ス板１に一
端をヒンジ結合した開閉器の投入操作レバー１２、該レ
バー１２の軸にクランクを介して前記のヒューズ保持具
６と連結し合う駆動アームエ３、該駆動アーム１３を左
方へ突出し付勢するばね１４、投入操作レバー１２を投
入位置に係止鎖錠するラッチ機構ｌ５、該ラソチ機構１
５を釈放操作する絶縁物製の操作ロノド１６、およびヒ
ューズ保持具６の先端に装着してヒューズ７に内蔵した
溶断表示ピン７ｂと操作ロッド１６との間に介装したＶ
字形の揺動レバー１７などの組立体から構成されている
。First, the overall structure of a load switch with a fuse is described in Fig. 1. In the figure, 1 is the temporary fuselage of the switch, 2 is the supporting insulator, 3.4 is the terminal fitting provided on each insulator 2, and 5 is one of the insulators. Fixed electrode 6 connected to terminal fitting 3 connects one end to the other insulator 2
7 is a fuse with a built-in blowout indicator pin mounted on the fuse holder 6; 8 and 9 are contacts connected to camps 7a at both ends of the fuse 7;
10 is a movable electrode connected to the contact 9 and in contact with the fixed electrode 5, and 11 is an arc extinguishing chamber. On the other hand, the movable electrode 10
The switch tripping mechanism for opening the switch includes a switch closing operation lever 12 whose one end is hinged to the base plate 1, and a shaft of the lever 12 connected to the fuse holder 6 through a crank. A matching drive arm 3, a spring 14 that protrudes and biases the drive arm 13 to the left, a latch mechanism 15 that locks the closing operation lever 12 in the closing position, and a closing mechanism 1.
an operating rod 16 made of an insulating material for releasing the fuse 5; and a V interposed between the operating rod 16 and the blowout indicator pin 7b attached to the tip of the fuse holder 6 and built into the fuse 7.
It is composed of an assembly including a swing lever 17 in the shape of a letter.
かかる構成で、実線で表す開閉器の投入位置では、端子
金具３と４との間に固定電極５．可動電極１０，ヒュー
ズ７を直列に経由する通電回路が形威される．ここで、
故障電流によりヒューズ７が溶断ずると、そのキャノブ
端面から外方に突き出す溶断表示ピン７ｂが揺動レバー
１７を押す。したがって、揺動レバー１７は揺動支点を
中心に時計方向に揺動し、該レバーの他端に当接してい
る開閉器引き外し機構の操作ロッド１６を右方向に押し
出してラノチ機構１５の釈放する。これにより投入操作
レバー１２が自由状態とＣつ、ばね１４の付勢により駆
動アーム１３が左方に突き出してヒューズ保持具６が実
線位置から鎖線位置に回動し、可動電極１０をｏｌ ＃
Ｊ電極５から引き離して開極する。なお、ヒューズ７を
新しいものに差し替えた上で投入操作レバー１２を引き
戻し操作すれば、ヒューズ保持具６が投入位置に復帰し
て固定電極５と可動電極１０との間が閉しると同時にラ
ノチ機構１５が係止ピンに掛かり、引き外し機構が投入
位置に鎖錠される。With this configuration, at the closing position of the switch indicated by the solid line, the fixed electrode 5. A current-carrying circuit is formed that passes through the movable electrode 10 and the fuse 7 in series. here,
When the fuse 7 blows due to a fault current, the blowout indicator pin 7b protruding outward from the end face of the cannob pushes the swing lever 17. Therefore, the swinging lever 17 swings clockwise around the swinging fulcrum, pushing out the operating rod 16 of the switch tripping mechanism that is in contact with the other end of the lever to the right, and releasing the lanoche mechanism 15. do. As a result, the closing operation lever 12 is moved to the free state, the drive arm 13 is pushed to the left by the bias of the spring 14, the fuse holder 6 is rotated from the solid line position to the chain line position, and the movable electrode 10 is moved to the ol #
It is separated from the J electrode 5 to open the electrode. Note that if the closing operation lever 12 is pulled back after replacing the fuse 7 with a new one, the fuse holder 6 returns to the closing position and the space between the fixed electrode 5 and the movable electrode 10 is closed, and at the same time the lano-chip is closed. The mechanism 15 engages the locking pin and the release mechanism is locked in the closed position.
一力、本発明により、前記揺動レバー１７には二方向性
の形状記憶合金で作られたレバーが採用され、その＼字
形レバーの一端がヒューズ７のキャップ７ａの端面と伝
熱的に接触し合うように配備されている。ここで、形状
記憶合金製の揺動レバー１７は、第２図に示すように常
温（３０〜４ ０ ’Ｃ ）では実線の形状を保ち、高
温（例えば９ ０ ’Ｃ ）に加熱されると形状記憶効
果による変態でレバー自身がＶ字角度を広げた鎖線の形
状に変形するするようにあらかしめその形状が記憶され
ている。First, according to the present invention, a lever made of a bidirectional shape memory alloy is adopted as the swing lever 17, and one end of the \-shaped lever is in thermal conductive contact with the end surface of the cap 7a of the fuse 7. They are arranged to match each other. Here, as shown in FIG. 2, the swing lever 17 made of shape memory alloy maintains the solid line shape at room temperature (30 to 40'C), and when heated to a high temperature (for example, 90'C). Due to the metamorphosis caused by the shape memory effect, the lever itself deforms into the shape of a chain line with a widened V-shaped angle, and that shape is memorized.
したがって、開閉器の投入状態で故障電流以下の過負荷
電流（通常負荷電流の２〜３倍程度）が通電してヒュー
ズ７が発熱し、その熱がヒューズのキャノブ７ａを通し
て揺動レバー１７に伝熱すると、揺動レバー自身が先記
した形状記憶効果により高温側に変態して第２図の鎖線
で示す形状に変形し、その変形力で開閉器引き外し機構
の操作ロッド１６を右方に押し出す。これにより、ヒュ
ーズ７の溶断動作時と同様に引き外し機構がトリンプし
て開閉器の固定電極５と可動電極ＩＯとの間が開極し、
過負荷電流をしゃ断する．なお、電流しゃ断の後に温度
が常温に低下すれば、揺動レバー１７は形状記憶効果に
より低温側に変魁して再び第２図の実線で表す形状に戻
る。Therefore, when the switch is closed, an overload current (approximately 2 to 3 times the normal load current) that is less than the fault current is applied and the fuse 7 generates heat, which is transmitted to the swing lever 17 through the fuse cannob 7a. When heated, the swing lever itself transforms to the high temperature side due to the aforementioned shape memory effect and deforms into the shape shown by the chain line in Figure 2, and the deformation force causes the operating rod 16 of the switch tripping mechanism to move to the right. push out As a result, the tripping mechanism is tripped in the same way as when the fuse 7 is blown, and the contact between the fixed electrode 5 and the movable electrode IO of the switch is opened.
Cuts off overload current. Note that if the temperature drops to room temperature after the current is cut off, the swing lever 17 shifts to the low temperature side due to the shape memory effect and returns to the shape shown by the solid line in FIG. 2 again.
本発明によるヒューズ付き負荷開閉器は、以上説明した
ように構成されているので、次記の効果を奏する。Since the load switch with fuse according to the present invention is configured as described above, it has the following effects.
すなわち、ヒューズの溶断表示ピンと開閉器引き外し機
構の操作ロッドとの間を連繋するように一端をヒューズ
側のキャップと伝熱的に接触させて配備した揺動レバー
を形状記憶合金製と威し、かつ過負荷ｔ流の通電，加熱
による揺動レバー自身の形状記憶効果による変形で開閉
器引き外し機構を機械的にトリノブさせるよう構戒した
ことにより、変流器，過電流保護継電器など用いた電気
的な引き外し装置を追加装備することなしに過負荷保護
機能を与えることができ、従来の負荷開閉器と比べて大
幅なコストダウンが図れる．In other words, the rocking lever is made of shape memory alloy and has one end in thermal contact with the cap on the fuse side so as to connect the fuse blowout indicator pin and the operating rod of the switch tripping mechanism. , and by taking precautions to mechanically trigger the switch tripping mechanism by deformation due to the shape memory effect of the swing lever itself due to overload current energization and heating, it is suitable for use in current transformers, overcurrent protection relays, etc. It is possible to provide an overload protection function without the need for additional electrical tripping devices, resulting in significant cost reductions compared to conventional load switches.
第１図は本発明実施例によるヒューズ付き負荷開閉器の
全体構底図、第２図は第１図における揺動レバーに対す
る形状記憶の動作説明図である．図において、FIG. 1 is an overall schematic diagram of a load switch with a fuse according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of shape memory operation for the swing lever in FIG. 1. In the figure,
Claims (1)
せ、ヒューズ溶断時のピン突出し動作で機械的に負荷開
閉器の引き外し機構をトリップさせて開閉器の電極を開
極するようにしたヒューズ付き負荷開閉器であり、ヒュ
ーズの溶断表示ピンと前記引き外し機構の操作ロッドと
の間に力を伝達するＶ字形の揺動レバーを介装したもの
において、前記揺動レバーを形状記憶合金製としてレバ
ーの一端をヒューズキャップの端面に伝熱的に接触して
配備し、ヒューズ溶断電流より低い過負荷電流の通電時
には、形状記憶効果による揺動レバー自身の変形力で負
荷開閉器の引き外し機構をトリップさせるよう構成した
ことを特徴とするヒューズ付き負荷開閉器。1) A fuse that combines a load switch with a fuse that has a built-in blowout indicator pin, and when the fuse blows, the pin protrudes to mechanically trip the load switch's tripping mechanism and open the switch's electrodes. The load switch is equipped with a V-shaped swinging lever that transmits force between the fuse blowout indicator pin and the operating rod of the tripping mechanism, wherein the swinging lever is made of a shape memory alloy. One end of the lever is placed in thermally contact with the end face of the fuse cap, and when an overload current lower than the fuse blowing current is applied, the load switch is tripped by the deformation force of the swinging lever itself due to the shape memory effect. A load switch with a fuse, characterized in that it is configured to trip the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003938A JP2676955B2 (en) | 1990-01-11 | 1990-01-11 | Load switch with fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003938A JP2676955B2 (en) | 1990-01-11 | 1990-01-11 | Load switch with fuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03208218A true JPH03208218A (en) | 1991-09-11 |
| JP2676955B2 JP2676955B2 (en) | 1997-11-17 |
Family
ID=11571072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003938A Expired - Lifetime JP2676955B2 (en) | 1990-01-11 | 1990-01-11 | Load switch with fuse |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2676955B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054047A (en) * | 2018-01-12 | 2018-05-18 | 国家电网公司 | A kind of Intelligent isolation switch |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6340346A (en) * | 1986-08-05 | 1988-02-20 | Mitsubishi Electric Corp | Semiconductor integrated circuit |
| JPS63126128A (en) * | 1986-11-17 | 1988-05-30 | 時枝 直満 | Breaker |
-
1990
- 1990-01-11 JP JP2003938A patent/JP2676955B2/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6340346A (en) * | 1986-08-05 | 1988-02-20 | Mitsubishi Electric Corp | Semiconductor integrated circuit |
| JPS63126128A (en) * | 1986-11-17 | 1988-05-30 | 時枝 直満 | Breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054047A (en) * | 2018-01-12 | 2018-05-18 | 国家电网公司 | A kind of Intelligent isolation switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2676955B2 (en) | 1997-11-17 |
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