JPH077688B2 - Disconnecting device - Google Patents
Disconnecting deviceInfo
- Publication number
- JPH077688B2 JPH077688B2 JP27010088A JP27010088A JPH077688B2 JP H077688 B2 JPH077688 B2 JP H077688B2 JP 27010088 A JP27010088 A JP 27010088A JP 27010088 A JP27010088 A JP 27010088A JP H077688 B2 JPH077688 B2 JP H077688B2
- Authority
- JP
- Japan
- Prior art keywords
- arc
- conductive plastic
- extinguishing resin
- resin
- extinguishing
- 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 - Fee Related
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- Adjustable Resistors (AREA)
- Thermistors And Varistors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電気回路の切り離し装置に関し、特に避雷器が
雷撃等により特性劣化して、洩れ電流が大きくなったり
雷サージ到来後の続流を遮断できなくなったときに、避
雷器を接地回路から切り離して電力系統回路の地絡異常
を防止する避雷器の切り離し装置に関するものである。Description: TECHNICAL FIELD The present invention relates to a device for disconnecting an electric circuit, and in particular, characteristics of a lightning arrester deteriorate due to lightning or the like, resulting in a large leakage current or interruption of a follow-up current after the arrival of a lightning surge. The present invention relates to a lightning arrester disconnecting device that disconnects a lightning arrester from a ground circuit when it is no longer possible to prevent a ground fault in a power system circuit.
配電線等の充電部と大地との間に接続され、雷サージ等
の異常電圧から電気設備を保護する避雷器は、一般に、
雷サージ等の高電圧印加時に低抵抗となり、配電線の通
常の対地電圧は完全に遮断するという電圧一電流特性を
持つ素子、例えばZnOを特性要素として用いる。Lightning arresters, which are connected between live parts such as distribution lines and the ground and protect electrical equipment from abnormal voltage such as lightning surge, are generally
An element with a voltage-current characteristic, such as ZnO, that has low resistance when a high voltage such as a lightning surge is applied and completely cuts off the normal ground voltage of the distribution line, is used as a characteristic element.
しかしこの特性要素は、多回数の雷サージを受けたり定
格を大きく上回るサージを受けると、上記電圧一電流特
性がどうしても劣化する。However, this characteristic element inevitably deteriorates the voltage-current characteristic when subjected to a large number of lightning surges or surges exceeding the rating.
この劣化によって、徐々に洩れ電流が大きくなり、また
雷サージ吸収動作時のエネルギーが過大となれば素子は
発熱し始め、熱暴走によりついには短絡破壊を起こして
地絡事故が生じる。すると避雷器が接続されている回路
の地絡リレー等を作動させ電力系統に大きな影響を与え
る。Due to this deterioration, the leakage current gradually increases, and if the energy at the time of lightning surge absorbing operation becomes excessive, the element starts to generate heat, and thermal runaway eventually causes short-circuit breakdown, resulting in a ground fault. Then, the ground fault relay or the like of the circuit to which the lightning arrester is connected is activated to have a great influence on the power system.
そこで、本出願人はこれを防止するため、第４図に示す
ような切り離し装置（１）を提案し（特開昭62−208581
号）、第５図または第６図に示すように避雷器（２）と
ともに配電線等の充電部（３）と大地（４）間に接続す
るようにした。Therefore, in order to prevent this, the present applicant has proposed a disconnecting device (1) as shown in FIG. 4 (Japanese Patent Laid-Open No. 62-208581).
No.), as shown in FIG. 5 or FIG. 6, the lightning arrester (2) and the charging section (3) such as a distribution line are connected to the ground (4).
この切り離し装置（１）は、所定値に温度上昇したとき
溶け、且つ発熱抵抗体として機能するように導電率を選
定した導電性プラスチック（５）を端子保持体として用
い、この両端に固定した一対の金属端子（６）（６）間
に、放電ギャップＧを形成している。This disconnecting device (1) uses a conductive plastic (5), whose conductivity is selected so that it melts when the temperature rises to a predetermined value and functions as a heating resistor, as a terminal holder, and is fixed to both ends. A discharge gap G is formed between the metal terminals (6) and (6).
この切り離し装置（１）は、避雷器（２）が劣化して洩
れ電流が多くなった場合及び避雷器が短絡破壊した場合
には、自己発熱により溶断して、上下の金属端子（６）
（６）を分離し、避雷器（２）を接地回路から切り離
す。このような動作によって電力系統回路への地絡異常
を防止する。This disconnecting device (1) melts by self-heating when the arrester (2) deteriorates and leak current increases and when the arrester is short-circuited and destroyed, and the upper and lower metal terminals (6).
Separate (6) and disconnect the arrester (2) from the ground circuit. Such an operation prevents a ground fault in the power system circuit.
しかしこの切り離し装置（１）は、避雷器（２）の劣化
等で導電性プラスチック（５）が溶断した際に、この溶
断点に発生するアークが消弧し難い問題があった。配電
線等の充電部（３）の対地電圧は数千ボルトと高いた
め、消弧には溶断した導電性プラスチックの切断端同士
が、例えば30cm以上離れる必要がある一方で、分離した
金属端子（６）（６）は、それに接続された太い電線に
よって支持され自重によっては通常少しの距離しか離れ
ないからである。このように続流が切れないと変電所で
復帰動作をする必要があり、切り離し装置（１）を用い
る意味がなくなる。However, this disconnecting device (1) has a problem that when the conductive plastic (5) is melted due to deterioration of the lightning arrester (2), the arc generated at this melting point is difficult to extinguish. Since the ground voltage of the charging part (3) such as distribution line is as high as several thousand volts, the cut ends of the fused conductive plastic must be separated by, for example, 30 cm or more to extinguish the arc, while separate metal terminals ( 6) (6) is because it is supported by a thick electric wire connected to it and is usually only a short distance depending on its own weight. If the follow-up current is not cut off in this way, it is necessary to perform a return operation at the substation, and it makes no sense to use the disconnecting device (1).
そこで、本出願人は導電性プラスチックが避雷器の不良
によって溶断して金属端子を分離したとき続流を確実に
遮断できる第７図に示すような切り離し装置（７）を発
明した。Therefore, the applicant of the present invention has invented a disconnecting device (7) as shown in FIG. 7, which can surely interrupt the follow-up current when the conductive plastic is melted due to a defect of the lightning arrester to separate the metal terminal.
第７図において、（８）は全長に亘って雄ネジを形成し
た棒状の導電性プラスチックで、所定値に温度上昇した
とき溶け、且つ発熱抵抗体として機能するように導電率
を選定されている。この導電性プラスチック（８）は、
例えば金属あるいは黒鉛等の導体粉末を混入した合成樹
脂により作られている。（10）（10）は導電性プラスチ
ックの両端に固定した棒状の金属端子で、上側の金属端
子（10）は内端に雌ネジ、外端に雄ネジを形成してい
る。また下側の金属端子（10）は、両端共に雌ネジを形
成している。（11）（11）は断面ハット形状の第１の消
弧性樹脂で、各金属端子（10）（10）の内端を囲むよう
に成形されている。第１の消弧性樹脂（11）（11）の素
材としてはジュラコン、ユリア樹脂等の加熱するとH2等
の消弧性ガスを発生するものが使用される。（12）は円
筒状の第２の消弧性樹脂で、頂面部分を向かい合わせて
配置される第１の消弧性樹脂（11）（11）の外周に滑動
自在に嵌められる。この素材は第１の消弧性樹脂（11）
と同様である。In FIG. 7, (8) is a rod-shaped conductive plastic in which a male screw is formed over the entire length, and its conductivity is selected so that it melts when the temperature rises to a predetermined value and functions as a heating resistor. . This conductive plastic (8)
For example, it is made of synthetic resin mixed with conductor powder such as metal or graphite. (10) (10) is a rod-shaped metal terminal fixed to both ends of a conductive plastic, and the upper metal terminal (10) has a female screw at the inner end and a male screw at the outer end. The lower metal terminal (10) is formed with female threads at both ends. (11) (11) is a first arc-extinguishing resin having a hat-shaped cross section, which is molded so as to surround the inner end of each metal terminal (10) (10). As a material for the first arc-extinguishing resin (11) (11), a material such as Duracon or urea resin that generates an arc-extinguishing gas such as H 2 when heated is used. Reference numeral (12) is a cylindrical second arc-extinguishing resin, which is slidably fitted on the outer circumference of the first arc-extinguishing resin (11) (11) arranged with their top surfaces facing each other. This material is the first arc extinguishing resin (11)
Is the same as.
この発明は避雷器が劣化又は短絡破壊すると自己発熱に
より導電性プラスチック（８）が急速に溶断して、金属
端子を切り離す。この溶断時に発生する高温ガスは消弧
性樹脂によって囲まれて、内圧を急上昇させる。さらに
この高温ガスが消弧性樹脂の表面に作用して水素等を発
生させる。この内圧の上昇と水素等の発生の相乗作用に
より、溶断点におけるアークは急速に消滅する。In the present invention, when the lightning arrester deteriorates or short-circuits and breaks, the conductive plastic (8) is rapidly melted by self-heating, and the metal terminal is disconnected. The high temperature gas generated during this melting is surrounded by the arc extinguishing resin, and the internal pressure rises sharply. Further, this high temperature gas acts on the surface of the arc extinguishing resin to generate hydrogen and the like. The arc at the fusing point is rapidly extinguished due to the synergistic effect of this increase in internal pressure and the generation of hydrogen and the like.
上記切り離し装置（７）は、導電性プラスチック（８）
の両端のネジ部を、金属端子（10）（10）に螺合させる
構造のため、この部分の接触抵抗が比較的大きくかつ製
作の条件で変動し易いため、一定の性能を得難い問題が
あった。また導電性プラスチック（８）を、外部電線と
の接線用の引出金具に接続するために、金属端子（10）
（10）を別に製作する必要がありコスト高となる問題も
あった。The separating device (7) is made of conductive plastic (8).
Due to the structure in which the screw parts on both ends of are screwed into the metal terminals (10) (10), the contact resistance of this part is relatively large and easily fluctuates depending on the manufacturing conditions, so there is a problem that it is difficult to obtain a certain performance. It was Further, in order to connect the conductive plastic (8) to the pull-out fitting for tangential connection with the external electric wire, the metal terminal (10)
Since (10) needs to be manufactured separately, there is a problem that the cost becomes high.
そこで、本発明は、導電性プラスチック自体に、この金
属端子の機能を持たせ、この導電性プラスチックに直
接、引出金具あるいは避雷器等の接続用電線を接続でき
る構造を提供することを目的とする。Therefore, an object of the present invention is to provide a structure in which the conductive plastic itself has the function of the metal terminal, and a connecting wire such as a lead-out fitting or a lightning arrester can be directly connected to the conductive plastic.
本発明は、所定値に温度上昇したとき溶け、且つ発熱抵
抗体として機能するように導電率を選定し、両端に中間
部より大径のネジ部を形成した棒状の導電性プラスチッ
クと、 上記導電性プラスチックの外周面に、上記ネジ部を突出
させかつ中間を分離してモールド固着した第１の消弧性
樹脂と、 上記第１の消弧性樹脂にスライド自在に外嵌した筒状の
第２の消弧性樹脂とを備えることを特徴とする切り離し
装置を開示する。The present invention is a rod-shaped conductive plastic in which the conductivity is selected so that it melts when the temperature rises to a predetermined value and functions as a heating resistor, and a threaded portion having a diameter larger than the intermediate portion is formed at both ends, Arc-extinguishing resin, the first arc-extinguishing resin in which the screw portion is projected and the middle part is separated and molded and fixed to the outer peripheral surface, and a cylindrical first arc-extinguishing resin slidably fitted over the first arc-extinguishing resin Disclosed is a disconnecting device including two arc extinguishing resins.
上記導電性プラスチックは、両端の大径部にネジ部が形
成され、金属端子が不用となる。またこのネジ部は大径
であるので、ここに接続される接続用導体との接触抵抗
が小さく、安定した性能の切り離し装置が提供できる。
さらに製作は第１の消弧性樹脂をモールド整形し、第２
の消弧性樹脂を嵌めるだけでよく工数が大幅に削減でき
る。The conductive plastic has threaded portions formed on the large-diameter portions at both ends, so that metal terminals are not required. Further, since this screw portion has a large diameter, the contact resistance with the connecting conductor connected here is small, and a disconnecting device with stable performance can be provided.
In addition, the first arc extinguishing resin is molded and shaped, and the second
The man-hours can be greatly reduced by simply fitting the arc-extinguishing resin.
本発明を一実施例について説明する。 The present invention will be described with reference to an embodiment.
第１図に示す切り離し装置（20）において、（21）は所
定値に温度上昇したとき溶け、且つ発熱抵抗体として機
能するように導電率を選定された導電性プラスチック
で、中間外周に環状溝（21a）が形成され、両端が大径
部（22）（22）となっている。この大径部（22）にはフ
ランジ（22a）が形成され、その端部は雄ネジ（23）（2
3）が形成されている。この導電性プラスチック（21）
は、例えば金属あるいは黒鉛等の導体粉末を混入した合
成樹脂により作られ、引出金具等との接触抵抗を小さく
するため雄ネジ（23）の表面に金属メッキを施すことが
好ましい。In the disconnecting device (20) shown in Fig. 1, (21) is a conductive plastic whose conductivity is selected so that it melts when the temperature rises to a predetermined value and functions as a heating resistor. (21a) is formed, and both ends are large diameter portions (22) and (22). A flange (22a) is formed on this large-diameter portion (22), and the end portion thereof has external threads (23) (2
3) has been formed. This conductive plastic (21)
Is made of, for example, a synthetic resin mixed with a conductor powder such as metal or graphite, and it is preferable that the surface of the male screw (23) is plated with metal in order to reduce the contact resistance with the drawer fitting or the like.
（24）（24）は第１の消弧性樹脂で、導電性プラスチッ
ク（21）のフランジ（22a）（22a）から環状溝（21a）
の手前までの部分を筒状に囲むように、導電性プラスチ
ック（21）と一体的にモールド整形されている。第１の
消弧性樹脂（24）（24）の素材としてはジュラコン、ユ
リア樹脂等の加熱するとH2等の消弧性ガスを発生するも
のが使用される。（25）は一端に内側に向く鍔（25a）
を有する円筒状の第２の消弧性樹脂で、第１の消弧性樹
脂（24）（24）の外周に滑動自在に嵌められる。この素
材は第１の消弧性樹脂（24）と同様である。(24) (24) is the first arc-extinguishing resin, which is formed from the flange (22a) (22a) of the conductive plastic (21) to the annular groove (21a).
Is molded integrally with the conductive plastic (21) so as to surround the part up to this side in a tubular shape. As a material for the first arc-extinguishing resin (24) (24), a material such as Duracon or urea resin that generates an arc-extinguishing gas such as H 2 when heated is used. (25) is a collar (25a) facing inward at one end
The second arc-extinguishing resin having a cylindrical shape is slidably fitted onto the outer circumference of the first arc-extinguishing resin (24) (24). This material is similar to the first arc extinguishing resin (24).
第２図(a)(b)(c)に示す（26）は金属帯板をハット形状
に曲げたギャップ金具で、第１図に示す切り離し装置
（20）に端部側から外嵌できるように頂面に孔（27）を
形成し、側面を円弧状に加工している。なお側面に設け
た切起し（26a）が形成されている。(26) shown in FIGS. 2 (a) (b) (c) is a gap fitting made by bending a metal strip into a hat shape so that it can be externally fitted to the separating device (20) shown in FIG. 1 from the end side. A hole (27) is formed on the top surface and the side surface is processed into an arc shape. A cut-and-raised portion (26a) provided on the side surface is formed.
上記切り離し装置（20）を具体的に使用するためにギャ
ップ金具（26）と組合せた構造を第３図に示す。FIG. 3 shows a structure in which the separating device (20) is combined with a gap fitting (26) for specific use.
前記ギャップ金具（26）は、雄ネジ（23）を形成した導
電性プラスチック（21）の大径部（22）に、その孔（2
7）を挿通させ、第２の消弧性樹脂（25）を両端から覆
うように嵌められる。そして、その先端のＲ状屈曲部を
対向させてギャップＧを形成する。この固定は引出金具
（28）とナット（29）による締め付けにより行われてい
る。The gap metal fitting (26) has a hole (2) formed in a large diameter portion (22) of a conductive plastic (21) having a male screw (23).
7) is inserted, and the second arc extinguishing resin (25) is fitted so as to cover both ends. Then, the R-shaped bent portion at the tip is opposed to form the gap G. This fixing is performed by tightening the pull-out fitting (28) and the nut (29).
このようなギャップ金具（26）と組み合わされた切り離
し装置（20）は第５図又は第６図に示すように避雷器
（２）と共に接地回路を構成する。The disconnecting device (20) combined with the gap metal fitting (26) constitutes a ground circuit together with the lightning arrester (2) as shown in FIG. 5 or FIG.
次にこの切り離し装置（20）の動作を説明する。Next, the operation of the separating device (20) will be described.
雷サージ等の異常電圧はギヤップＧ及び避雷器（２）を
通して大地に流れる。避雷器（２）が劣化して配電線の
通常の対地電圧を遮断できなくなると、導電性プラスチ
ック（21）が発熱して溶断する。この溶断は強度的に弱
く、かつ発熱が集中する環状溝（21a）の形成部分に生
じ、この溶断点にアークが発生する。Abnormal voltage such as lightning surge flows to the ground through the gearup G and the lightning arrester (2). If the lightning arrester (2) deteriorates and the normal ground voltage of the distribution line cannot be cut off, the conductive plastic (21) will generate heat and melt down. This fusing is weak in strength and occurs at the portion where the annular groove (21a) where heat is concentrated is formed, and an arc is generated at this fusing point.
溶断の直前から、導電性プラスチック（21）は気化を始
めているが、溶断直後の溶断点におけるアーク発生で、
気化量は急激に増加する。気化により発生するガスは、
溶断部の導電性プラスチックの全てが気化するので大量
のものとなり、熱エネルギーも与えられるので圧力上昇
は大きい。The conductive plastic (21) started to vaporize just before the fusing, but an arc was generated at the fusing point immediately after the fusing,
The amount of vaporization increases rapidly. The gas generated by vaporization is
Since all of the conductive plastic in the fusing part is vaporized, it becomes a large amount, and thermal energy is also given, so that the pressure rise is large.
この溶断時の発熱は、消弧性樹脂（24）（24）（25）に
作用し、H2等の消弧性ガスを発生させる。この加熱は、
溶断前から行われるので、アークが消弧性樹脂の表面に
接触すると、瞬時に消弧性気体の発生量は急上昇する。The heat generated at the time of melting acts on the arc extinguishing resin (24) (24) (25) to generate arc extinguishing gas such as H 2 . This heating is
Since the process is performed before the fusing, when the arc comes into contact with the surface of the arc-extinguishing resin, the amount of the arc-extinguishing gas generated suddenly increases.
そして、導電性プラスチック（21）は、電線等の自重又
は図示しない引張スプリングの力で高速に上下に分離を
始める。Then, the conductive plastic (21) starts to separate up and down at high speed by its own weight of the electric wire or the like or the force of a tension spring (not shown).
上記アーク発生直後から、第１の消弧性樹脂（24）（2
4）が上下に分離し、微小な隙間をもって嵌まり合って
いる円筒状の第２の消弧性樹脂（25）が外れるまでの期
間は、アークを発生する溶断部は、第１及び第２の消弧
性樹脂で囲まれる空間内に閉じ込められている。Immediately after the occurrence of the above arc, the first arc extinguishing resin (24) (2
During the period until the second cylindrical arc-extinguishing resin (25), which is separated vertically and is fitted with a minute gap, comes off, the fusing parts that generate an arc are the first and second fusing parts. It is confined in a space surrounded by arc-extinguishing resin.
したがって、溶断直後のアーク発生で瞬時に圧力が上昇
し、閉じ込められたアークが消弧性樹脂（24）（24）
（25）に充分に接触するので、消弧に十分な消弧性ガス
が発生する。これに、上記導電性プラスチック（21）の
分離によるアークの引き延ばしが加わるので、アークは
短時間で消滅し、配電系統の充電部における通常の対地
電圧による続流は遮断される。Therefore, the pressure immediately rises due to the arc generation immediately after melting, and the confined arc is extinguished by the arc-extinguishing resin (24) (24).
Since it is in sufficient contact with (25), arc-extinguishing gas sufficient for arc extinction is generated. Since the arc is extended by the separation of the conductive plastic (21), the arc is extinguished in a short time, and the continuous current due to the normal ground voltage in the charging section of the distribution system is interrupted.
なお、上記閉じ込められた空間の容積は、スプリング等
による第１の消弧性樹脂（24）（24）の分離によって増
加し、高圧化を妨げるようであるが、実際は、第１図に
示したような構造では、慣性を伴う機械的な運動より
も、上記予熱された樹脂のアークによる気化速度が速
く、容積の増加に比べガス発生量が膨大なため、高圧化
が妨げられることはなく、第２の消弧性樹脂（25）が第
１の消弧性樹脂（24）（24）から外れるまで、高圧状態
が保たれる。The volume of the confined space seems to increase due to the separation of the first arc-extinguishing resin (24) (24) by a spring or the like, which hinders the high pressure, but in reality, it is shown in FIG. In such a structure, rather than mechanical movement accompanied by inertia, the vaporization rate by the arc of the preheated resin is faster, because the gas generation amount is huge compared to the increase in volume, high pressure is not hindered, The high pressure state is maintained until the second arc extinguishing resin (25) comes off the first arc extinguishing resin (24) (24).
以上説明した実施例は、本発明を避雷器の切り離し装置
として構成したものであったが、本発明は電気回路にお
ける切り離し装置としても用いることができる。Although the embodiments described above constitute the present invention as a device for disconnecting a lightning arrester, the present invention can also be used as a device for disconnecting an electric circuit.
本発明によれば、導電性プラスチックの溶断部分を消弧
性樹脂で囲んで狭い空間を形成し、溶断時のアークを確
実に消せるようにした切り離し装置において、導電性プ
ラスチックの形状に工夫をしたので、製作工数が大幅に
減少し、コストを大幅に削減できると同時に、接触抵抗
を小さくして性能の向上と安定化が図れる。According to the present invention, the shape of the conductive plastic is devised in the disconnecting device in which the fusing part of the conductive plastic is surrounded by the arc-extinguishing resin to form a narrow space so that the arc during the fusing can be surely extinguished. Therefore, the number of manufacturing steps can be significantly reduced, and the cost can be significantly reduced, and at the same time, the contact resistance can be reduced to improve the performance and stabilize the performance.
第１図は本発明の一実施例を示す断面図である。第２図
はギャップ金具を示す図で、その(a)は正面図、その(b)
は平面図、その(c)は側面図である。第３図は本発明を
ギャップ金具と組合せて示す断面図である。 第４図は従来の切り離し装置の断面図、第５図及び第６
図は切り離し装置を避雷器に取りつける状態を示す説明
図、第７図は本発明の前提となる切り離し装置の断面図
である。 （21）……導電性プラスチック、 （22）……大径部、（23）……ネジ部、 （24）……第１の消弧性樹脂、 （25）……第２の消弧性樹脂。FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a view showing a gap metal fitting, in which (a) is a front view and (b) thereof.
Is a plan view and (c) is a side view. FIG. 3 is a sectional view showing the present invention in combination with a gap fitting. FIG. 4 is a sectional view of a conventional separating device, FIGS. 5 and 6
FIG. 7 is an explanatory view showing a state in which the separating device is attached to the lightning arrester, and FIG. 7 is a sectional view of the separating device which is a premise of the present invention. (21) …… conductive plastic, (22) …… large diameter part, (23) …… screw part, (24) …… first arc extinguishing resin, (25) …… second arc extinguishing property resin.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高山 亨 大阪府大阪市旭区中宮３丁目15番25号 (72)発明者 芋生 保幸 大阪府大阪市西淀川区佃１丁目26番２― 1306 (56)参考文献 特開 昭62−208581（ＪＰ，Ａ) 特開 昭59−167982（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Takayama 3-15-25 Nakamiya, Asahi-ku, Osaka City, Osaka Prefecture (72) Inventor Yasuyuki Imo, 1-26-1306, Tsukuda, Nishiyodogawa-ku, Osaka City, Osaka Prefecture (56) ) Reference JP 62-208581 (JP, A) JP 59-167982 (JP, A)
Claims (1)
抵抗体として機能するように導電率を選定し、両端に中
間部より大径のネジ部を形成した棒状の導電性プラスチ
ックと、 上記導電性プラスチックの外周面に、上記ネジ部を突出
させかつ中間を分離してモールド固着した第１の消弧性
樹脂と、 上記第１の消弧性樹脂にスライド自在に外嵌した筒状の
第２の消弧性樹脂とを備えることを特徴とする切り離し
装置。1. A rod-shaped conductive plastic in which the conductivity is selected so that it melts when the temperature rises to a predetermined value and functions as a heating resistor, and threaded portions having diameters larger than the intermediate portion are formed at both ends, A first arc-extinguishing resin in which the screw portion is projected and the middle is separated and molded and fixed to the outer peripheral surface of the conductive plastic, and a tubular shape slidably fitted on the first arc-extinguishing resin. A disconnecting device comprising a second arc extinguishing resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27010088A JPH077688B2 (en) | 1988-10-25 | 1988-10-25 | Disconnecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27010088A JPH077688B2 (en) | 1988-10-25 | 1988-10-25 | Disconnecting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02117084A JPH02117084A (en) | 1990-05-01 |
| JPH077688B2 true JPH077688B2 (en) | 1995-01-30 |
Family
ID=17481534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27010088A Expired - Fee Related JPH077688B2 (en) | 1988-10-25 | 1988-10-25 | Disconnecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077688B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0421091U (en) * | 1990-06-08 | 1992-02-21 |
-
1988
- 1988-10-25 JP JP27010088A patent/JPH077688B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02117084A (en) | 1990-05-01 |
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