JP3609749B2 - Lightning arrester - Google Patents
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- JP3609749B2 JP3609749B2 JP2001152207A JP2001152207A JP3609749B2 JP 3609749 B2 JP3609749 B2 JP 3609749B2 JP 2001152207 A JP2001152207 A JP 2001152207A JP 2001152207 A JP2001152207 A JP 2001152207A JP 3609749 B2 JP3609749 B2 JP 3609749B2
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Description
【０００１】
【発明の属する技術分野】
本発明は送電線等に設置され、架空送電線の碍子を落雷より保護し、送電線の雷害を低減させる避雷装置に関し、さらに詳細には、酸化亜鉛素子の回りにＦＲＰ等の絶縁ロッドを配し、絶縁ロッドを端末金具に固定して、酸化亜鉛素子同士をバネ等の押しつけ力により密着させるように構成した避雷装置に関するものである。
【０００２】
【従来の技術】
送電線においては、上記したように落雷等から送電線をを保護するために、避雷装置が設置されている。
上記避雷装置として、構造を簡単にするとともに組み立てを容易にし、さらにコンパクト化、軽量化を図るため、端末金具間に配置した酸化亜鉛素子の回りにＦＲＰ等の絶縁ロッド（絶縁棒）を配し、絶縁ロッドの両端を上記端末金具に固着し、絶縁ロッドにて、酸化亜鉛素子同士の密着のために加えるバネ等による押しつけ力を受け持つようにした避雷装置が提案されている（例えば、特開昭６３−３１２６０２号公報、特開平０６−３１０３０７号公報、実開昭０６−６０１０４号公報、特開平０８−１１５６２６号公報）。
【０００３】
上記特開昭６３−３１２６０２号公報には、課電側電極板および接地側電極板（端末金具）のそれぞれに複数の切り欠きを形成し、この切り欠きに、絶縁棒の両端部をねじ等の係止具により係合し、両電極板の間に限流素子を介在させてバネにより両電極板を押圧し、電極板、絶縁棒、限流素子の外周をゴムモールドした避雷ユニットが記載されている。
また、特開平０６−３１０３０７号公報には、複数個のＺｎＯ素子を積み重ね、その重合する部分の側面に耐熱性テープを貼り付けるとともに、上下両端部に上金具と下金具（端末金具）を配置し、上金具と下金具をＦＲＰ棒（絶縁棒）にねじにより固定し、ＺｎＯ素子とＦＲＰ棒と上金具と下金具の外周をモールドした避雷器が記載されている。
さらに、実開昭０６−６０１０４号公報、特開平０８−１１５６２６号公報には、避雷素子の円周に沿って複数本の支持棒（絶縁棒）を配置し、支持棒の両端に、該支持棒が挿通される支持板（端末金具）を設け、支持板の上と下の支持棒にストッパを取り付けて、該ストッパに半径方向の力を加えて潰し、ストッパを支持棒に圧着したり、かしめ具により、ストッパを部分的に支持棒にめり込ませることにより、支持棒と支持板を固定するようにした避雷器が記載されている。
【０００４】
【発明が解決しようとする課題】
上記構造の避雷装置においては、酸化亜鉛素子の回りに配置したＦＲＰ等の絶縁棒を、酸化亜鉛素子の両側に設けられる端末金具に、充分な引っ張り強度を持たせて固着する必要がある。
上記特開昭６３−３１２６０２号公報、特開平０６−３１０３０７号公報に記載されるものでは、絶縁ロッド（絶縁棒）にねじを切り、ねじにより絶縁ロッドに電極板（端末金具）を固着し、ねじの推力よりばねの押しつけ力を支えている。
しかし、絶縁ロッドには、引っ張り強度を支えるため、ＦＲＰが使用されることが多く、ＦＲＰロッドにねじを切るのはコスト高となる。また、ねじを切っても、樹脂の引っ張り強度しか得られず、ＦＲＰ本来のガラス繊維による引っ張り強度は期待できない。このため充分な押圧力を得ることができないといった問題がある。
【０００５】
また、上記実開昭０６−６０１０４号公報、特開平０８−１１５６２６号公報に記載されるものでは、支持板（端末金具）に支持棒（絶縁棒）を挿通し、支持板の上と下の支持棒にストッパを、圧着、もしくは、かしめにより取り付け、支持棒に支持板を固着しているが、この方法はストッパを必要とし、部品点数が増加しコスト高となる。
本発明は上記従来技術の問題点に鑑みなされたものであって、本発明の目的は、絶縁棒に端末金具を充分な引っ張り強度をもって固着することができ、安価で、かつ部品点数が増加することがない絶縁棒と端末金具の固着構造を備えた避雷装置を提供することである。
【０００６】
【課題を解決するための手段】
上記課題を本発明においては、次のように解決する。
（１）端末金具間に避雷素子を段積みし、両端の端末金具を絶縁棒で連結し、避雷素子と絶縁棒の外周を樹脂でモールドした避雷装置において、円盤状の端末金具を円周方向にｎ分割し、該端末金具の中心と一致する中心を持つ同一円周上に均等の間隔でｎ個の穴を設ける。
そして、上記穴に絶縁棒を挿入し、端末金具外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して絶縁棒を端末金具に固着する。
（２）端末金具間に避雷素子を段積みし、両端の端末金具を絶縁棒で連結し、避雷素子と絶縁棒の外周を樹脂でモールドした避雷装置において、円盤状の端末金具を円周方向にｎ分割し、該端末金具の中心と一致する中心を持つ同一円周上に均等の間隔でｎ個の点を配置し、上記円周上であって、上記ｎ個の点の両側の近傍に２つの穴を設ける。
そして、上記穴に絶縁棒を挿入し、端末金具外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して絶縁棒を端末金具に固着する。
（３）上記ｎを偶数とする。
（４）上記ｎを４〜８とする。
（５）絶縁棒挿入穴に接着剤を塗布した後に圧縮する。
【０００７】
本発明においては、上記のように、端末金具を円周方向にｎ分割し、端末金具上の同一円周上に均等の間隔でｎ個の穴を設け、該穴に絶縁棒を挿入して、外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して、端末金具に絶縁棒を固着するように構成したので、部品点数を増やすことなく強固に端末金具と絶縁棒を固着することができる。このため、安価にかつ信頼性の高い避雷装置を得ることができる。
また、端末金具上の同一円周上に均等の間隔でｎ個の点を配置し、ｎ個の点の両側の近傍に２つの穴を設け、該穴に絶縁棒を挿入して、上記のように固着するすることにより、ｎの分割数を増やすことなく、絶縁棒の本数を２倍にすることができ、さらに引っ張り強度を増加させることができる。
また、上記ｎを偶数とすることにより、端末金具を均等に圧縮することが可能となる。さらに、上記ｎを４〜８とすることにより、避雷素子の抜け落ちを防止するとともに、端末金具をダイスにより十分に塑性変形させることができる。
またさらに、絶縁棒挿入穴に接着剤を塗布した後に圧縮することにより、引っ張り強度を増やすことができる。
【０００８】
【発明の実施の形態】
図１は本発明の実施例の避雷装置の構成を示す図である。同図（ａ）は避雷装置の側面図を示し、同図は樹脂モールド前の状態を示しており、その外周を同図の点線に示すようにシリコーン樹脂等のモールド材でモールドすることにより、避雷装置を組み立てる。また、同図（ｂ）（ｃ）は端末金具の構成を示し、（ｂ）は側面図、（ｃ）は（ｂ）のＡ方向から見た図を示す。
図１において、１はＦＲＰ製の絶縁棒、２ａ，２ｂは例えばアルミ製の端末金具である。端末金具２ａ，２ｂには、同図（ｂ）（ｃ）に示すように上記絶縁棒１が挿入される穴２ｃが設けられている。この実施例では、端末金具２ａ，２ｂの円周方向に等間隔に８個の穴２ｃが設けられており、端末金具２ａ，２ｂに設けられた穴２ｃに絶縁棒１の両端を挿入し、後述するように端末金具２ａ，２ｂを圧縮することにより、絶縁棒１を端末金具２ａ，２ｂに固着し、端末金具２ａ，２ｂを絶縁棒１を介して連結する。
端末金具２ａ，２ｂの間には、複数個の酸化亜鉛素子３とバネ４が設けられており、バネ４により酸化亜鉛素子３を押圧し、酸化亜鉛同士を密着させている。
上記のような組み立て体を構成したのち、図１（ａ）の点線に示すように、端末金具の一部を外部に露出させて、その周囲をシリコーン樹脂等のモールド材５で一体にモールドする。
【０００９】
図２は図１に示す実施例の避雷装置において、端末金具２ａ，２ｂに絶縁棒１をダイスを用いて圧縮・固着する際のダイスの配置を示す図である。図２（ａ）は避雷器の軸方向から端末金具を見た図、図２（ｂ）は避雷器の側面から端末金具およびダイスを見た図を示しており、図２（ｂ）では、端末金具の両側のダイス以外のダイスは省略されている。
図１（ｃ）に示すように端末金具２ａ，２ｂには、その円周方向に等間隔に８個の穴２ｃが設けられている。同図では、８個の穴を設ける場合について示しているが、一般には、円盤状の端末金具２ａ，２ｂを円周方向にｎ分割し、端末金具２ａ，２ｂの中心と一致する中心を持つ円周上に、均等の間隔でｎ個の穴２ｃを設ける。
【００１０】
そして、上記穴２ｃに絶縁棒１を挿入し、図２（ａ）に示すように端末金具２ａ，２ｂの周囲に配置したｎ個（この例では８個）のダイス６により、上記穴２ｃの中心と、円盤状の端末金具２ａ，２ｂの中心を結ぶ直線方向に均等に圧縮力を与えて、端末金具２ａ，２ｂを圧縮する。これにより、上記穴２ｃが変形し、絶縁棒１と端末金具２ａ，２ｂが固着される。
以上のように、ダイス６により端末金具２ａ，２ｂを圧縮することにより、絶縁棒１と端末金具２ａ，２ｂ間で充分な摩擦力が得られ、酸化亜鉛素子３を押しつけるバネ４の反力を絶縁棒１が受け持つことが可能となる。
【００１１】
ここで、端末金具２ａ，２ｂの円周方向の分割数ｎは、４以上が望ましい。分割数が４より少ないと、酸化亜鉛素子３が絶縁棒１の間から抜け落ちてしまう場合が生ずる。但し、上記ｎが過剰に多いと、ダイスの幅が狭くなりすぎ、端末金具２ａ，２ｂを充分に塑性変形させることができなくなり、十分な絶縁棒１と端末金具２ａ，２ｂの間の引っ張り強度をだせない。したがって、上記分割数ｎは８程度までがよい。また、端末金具２ａ，２ｂを均等に圧縮するには、端末金具２ａ，２ｂの中心に対して、点対称の位置にダイス６を配置するのが好ましく、したがってｎは偶数とするのが良い。
【００１２】
本実施例の効果を確認するため、上記端末金具として径が略φ６０ｍｍ、厚さが３９ｍｍのものを用い、また、上記絶縁棒としてφ３ｍｍのＦＲＰ棒を図１に示すように８本用い、該ＦＲＰ棒を端末金具に設けたφ３．２ｍｍの穴に深さ２５ｍｍまで挿入して、その回りを図２に示すようにダイスにより圧縮して、ＦＲＰ棒が抜け落ちる荷重（引っ張り強度）を測定した。
その結果、図２（ｂ）に示すダイスにより８５ｂａｒまで圧縮した場合に、約２０００ｋｇｆ以上の引っ張り強度が得られた。
酸化亜鉛素子の耐圧縮力（ばね圧）は最大数百Ｋｇｆであり、上記圧縮接続により十分な強度が得られることが確認された。
さらに絶縁棒を挿入する穴内部にアラルダイト系接着剤を塗り、絶縁棒を挿入して、接着剤が硬化する前に、上と同様に圧縮を行った後、十分接着剤が乾燥するまで常温放置したものを引張り試験したところ、引張り強度が約３０００ｋｇｆと接着剤を塗らずに圧縮したものより増加した。
これは圧縮され塑性変形した挿入穴と絶縁棒との隙間に接着剤が充填して硬化し、絶縁棒の全周にわたって金具と接触することにより、圧縮のみでは絶縁棒全周が金具と接触することはなく隙間が生じていた金具と絶縁棒の接触面が増えて、絶縁棒に引張り重荷がかかったときに重荷を受け持つ面が増加したことにより引張り強度が増えたものである。
【００１３】
図３は端末金具２ａ，２ｂ上の穴２ｃの他の配置例を示す図であり、避雷器の軸方向から端末金具を見た図を示している。
図３では、端末金具２ａ，２ｂを円周方向に８分割し、各８分割点の両側に対称に絶縁棒挿入用の２個の穴２ｃ（この例では合計１６個の穴）を設けている。すなわち、分割数がｎの場合には、円盤状の端末金具２ａ，２ｂの中心と一致する中心を持つ同一円周上に均等の間隔でｎ個の点を配置し、上記円周上であって、上記ｎ個の点の両側の近傍に、それぞれ、該ｎ個の点を中心として対称に絶縁棒１を挿入する２つの穴２ｃを設ける。該２個の穴２ｃの距離は一つのダイスで圧縮できる距離内であることが必要である。
そして、上記穴２ｃに絶縁棒１を挿入し、図３に示すように端末金具２ａ，２ｂの周囲に配置したｎ個（この例では８個）のダイス６により、上記ｎ個の点と、円盤状の端末金具２ａ，２ｂの中心を結ぶ直線方向に均等に圧縮力を与えて、端末金具２ａ，２ｂを圧縮する。
上記のように構成することにより、円周上のｎ分割数を過剰に多くすることなく、絶縁棒１の本数を図１に示したものの２倍とすることができ、その分だけ引っ張り強度を増大させることができる。
【００１４】
【発明の効果】
以上説明したように本発明においては、以下の効果を得ることができる。
（１）端末金具を円周方向にｎ分割し、端末金具上の同一円周上に均等の間隔でｎ個の穴を設け、該穴に絶縁棒を挿入して、外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して、端末金具に絶縁棒を固着するように構成したので、部品点数を増やすことなく強固に端末金具と絶縁棒を固着することができる。このため、安価にかつ信頼性の高い避雷装置を得ることができる。
（２）端末金具上の同一円周上に均等の間隔でｎ個の点を配置し、ｎ個の点の両側の近傍に２つの穴を設け、該穴に絶縁棒を挿入して、上記のように固着するすることにより、ｎの分割数を増やすことなく、絶縁棒の本数を２倍にすることができ、さらに引っ張り強度を増加させることができる。
（３）上記ｎを偶数とすることにより、端末金具を均等に圧縮することが可能となる。また、上記ｎを４〜８とすることにより、避雷素子の抜け落ちを防止するとともに、端末金具をダイスにより十分に塑性変形させることが可能となる。
（４）絶縁棒挿入穴に接着剤を塗布した後に圧縮することにより、引っ張り強度を増やすことができる。
【図面の簡単な説明】
【図１】本発明の実施例の避雷装置の構成を示す図である。
【図２】端末金具に絶縁棒を圧縮・固着する際のダイスの配置を示す図である。
【図３】端末金具に配置する穴の他の配置例を示す図である。
【符号の説明】
１ 絶縁棒
２ａ，２ｂ 端末金具
２ｃ 穴
３ 酸化亜鉛素子
４ バネ４
５ モールド材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightning arrester that is installed in a power transmission line, etc., protects an insulator of an overhead power transmission line from lightning, and reduces lightning damage of the power transmission line, and more specifically, an insulating rod such as FRP around a zinc oxide element. In particular, the present invention relates to a lightning arrester configured such that an insulating rod is fixed to a terminal fitting, and zinc oxide elements are brought into close contact with each other by a pressing force such as a spring.
[0002]
[Prior art]
In the power transmission line, as described above, a lightning arrester is installed to protect the power transmission line from lightning strikes and the like.
As the above lightning arrester, an insulating rod (insulating rod) such as FRP is arranged around the zinc oxide elements arranged between the end fittings in order to simplify the structure and facilitate assembly, and to further reduce the size and weight. In addition, a lightning arrester has been proposed in which both ends of an insulating rod are fixed to the terminal fitting, and the insulating rod is subjected to a pressing force by a spring or the like applied for adhesion between zinc oxide elements (for example, JP Sho 63-312602, JP-A 06-310307, JP-A 06-60104, JP 08-115626).
[0003]
In the above Japanese Patent Laid-Open No. 63-312602, a plurality of notches are formed in each of the voltage-applying electrode plate and the ground-side electrode plate (terminal fitting), and both ends of the insulating rod are screwed into these notches A lightning protection unit is described in which a current limiting element is interposed between the electrode plates, a current limiting element is interposed between the electrode plates, both electrode plates are pressed by a spring, and the outer periphery of the electrode plate, the insulating rod, and the current limiting element is rubber molded. Yes.
In JP-A-06-310307, a plurality of ZnO elements are stacked, a heat-resistant tape is attached to the side surface of the overlapping portion, and upper and lower metal fittings (terminal metal fittings) are arranged at both upper and lower ends. A lightning arrester is described in which an upper metal fitting and a lower metal fitting are fixed to an FRP rod (insulating rod) with screws, and the outer periphery of the ZnO element, the FRP rod, the upper metal fitting, and the lower metal fitting is molded.
Furthermore, in Japanese Utility Model Laid-Open No. 06-60104 and Japanese Patent Application Laid-Open No. 08-115626, a plurality of support bars (insulating bars) are arranged along the circumference of the lightning protection element, and the support bars are provided at both ends of the support bar. Provide a support plate (terminal bracket) through which the rod is inserted, attach stoppers to the upper and lower support rods of the support plate, crush them by applying radial force to the stopper, and press the stopper to the support rod, or caulking tools Describes a lightning arrester in which the support bar and the support plate are fixed by partially inserting the stopper into the support bar.
[0004]
[Problems to be solved by the invention]
In the lightning arrester having the above structure, it is necessary to fix an insulating rod such as FRP arranged around the zinc oxide element with sufficient tensile strength to terminal fittings provided on both sides of the zinc oxide element.
In the above-mentioned JP-A-63-312602 and JP-A-06-310307, a screw is cut on an insulating rod (insulating bar), and an electrode plate (terminal fitting) is fixed to the insulating rod with a screw, Supports the pressing force of the spring rather than the thrust of the screw.
However, in order to support the tensile strength of the insulating rod, FRP is often used, and it is expensive to cut a screw on the FRP rod. Moreover, even if the screw is cut, only the tensile strength of the resin can be obtained, and the tensile strength due to the FRP original glass fiber cannot be expected. For this reason, there is a problem that a sufficient pressing force cannot be obtained.
[0005]
Moreover, in what is described in Japanese Utility Model Laid-Open No. 06-60104 and Japanese Patent Application Laid-Open No. 08-115626, a support bar (insulating bar) is inserted into a support plate (terminal fitting), and support rods above and below the support plate. A stopper is attached to the support rod by crimping or caulking, and the support plate is fixed to the support rod. However, this method requires a stopper, which increases the number of parts and increases the cost.
The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to fix a terminal fitting to an insulating rod with sufficient tensile strength, which is inexpensive and increases the number of parts. It is an object of the present invention to provide a lightning arrester having a structure for securing an insulating rod and a terminal fitting.
[0006]
[Means for Solving the Problems]
In the present invention, the above problem is solved as follows.
(1) In a lightning arrester in which lightning protection elements are stacked between terminal fittings, the terminal fittings at both ends are connected with insulating rods, and the outer periphery of the lightning arresting device and the insulating rod is molded with resin, the disk-shaped terminal fittings are arranged in the circumferential direction. And n holes are provided at equal intervals on the same circumference having a center coinciding with the center of the terminal fitting.
Then, an insulating rod is inserted into the hole, and the end fitting is compressed in the direction of the center point of the end fitting with a die divided into n from the outer circumference of the end fitting to fix the insulating rod to the end fitting.
(2) In a lightning protection device in which lightning protection elements are stacked between terminal fittings, the terminal fittings at both ends are connected with insulating rods, and the outer periphery of the lightning protection device and the insulating rod is molded with resin, the disk-shaped terminal fittings are arranged in the circumferential direction. And n points are arranged at equal intervals on the same circumference having a center that coincides with the center of the terminal fitting, and in the vicinity of both sides of the n points on the circumference Two holes are provided in
Then, an insulating rod is inserted into the hole, and the end fitting is compressed in the direction of the center point of the end fitting with a die divided into n from the outer circumference of the end fitting to fix the insulating rod to the end fitting.
(3) Let n be an even number.
(4) The above n is 4-8.
(5) Applying an adhesive to the insulating rod insertion hole and then compressing.
[0007]
In the present invention, as described above, the terminal fitting is divided into n in the circumferential direction, n holes are provided at equal intervals on the same circumference on the terminal fitting, and an insulating rod is inserted into the hole. Because the terminal fitting is compressed in the direction of the center point of the terminal fitting with a die divided into n from the outer periphery, and the insulation rod is fixed to the terminal fitting, the terminal fitting and the insulation rod are firmly fixed without increasing the number of parts. Can be fixed. For this reason, an inexpensive and highly reliable lightning arrester can be obtained.
Further, n points are arranged at equal intervals on the same circumference on the terminal fitting, two holes are provided in the vicinity of both sides of the n points, and an insulating rod is inserted into the hole, By fixing in this manner, the number of insulating bars can be doubled and the tensile strength can be increased without increasing the number of divisions of n.
Moreover, it becomes possible to compress a terminal metal fitting uniformly by making said n into an even number. Further, by setting n to 4 to 8, it is possible to prevent the lightning protection element from falling off and to sufficiently plastically deform the terminal fitting with the die.
Furthermore, the tensile strength can be increased by compressing after applying an adhesive to the insulating rod insertion hole.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a configuration of a lightning arrester according to an embodiment of the present invention. The figure (a) shows the side view of the lightning arrester, the figure shows the state before resin molding, and by molding its outer periphery with a molding material such as silicone resin as shown by the dotted line in the figure, Assemble the lightning arrester. Moreover, the figure (b) (c) shows the structure of a terminal metal fitting, (b) is a side view, (c) shows the figure seen from the A direction of (b).
In FIG. 1, 1 is an FRP insulating rod, and 2a and 2b are aluminum terminal fittings, for example. The terminal fittings 2a and 2b are provided with a hole 2c into which the insulating rod 1 is inserted as shown in FIGS. In this embodiment, eight holes 2c are provided at equal intervals in the circumferential direction of the terminal fittings 2a and 2b, and both ends of the insulating rod 1 are inserted into the holes 2c provided in the terminal fittings 2a and 2b. As will be described later, by compressing the terminal fittings 2a and 2b, the insulating rod 1 is fixed to the terminal fittings 2a and 2b, and the terminal fittings 2a and 2b are connected via the insulating rod 1.
A plurality of zinc oxide elements 3 and
After constructing the assembly as described above, as shown by the dotted line in FIG. 1A, a part of the terminal fitting is exposed to the outside and the periphery thereof is integrally molded with a molding material 5 such as silicone resin. .
[0009]
FIG. 2 is a diagram showing the arrangement of dies when the insulating rod 1 is compressed and fixed to the terminal fittings 2a and 2b using the dies in the lightning arrester of the embodiment shown in FIG. 2A shows a view of the end fitting from the axial direction of the lightning arrester, FIG. 2B shows a view of the end fitting and the die viewed from the side of the lightning arrester, and FIG. 2B shows the end fitting. The dice other than the dice on both sides of are omitted.
As shown in FIG. 1C, the end fittings 2a and 2b are provided with eight holes 2c at equal intervals in the circumferential direction. Although the figure shows a case where eight holes are provided, generally, the disk-shaped terminal fittings 2a and 2b are divided into n in the circumferential direction and have a center that coincides with the center of the terminal fittings 2a and 2b. On the circumference, n holes 2c are provided at equal intervals.
[0010]
Then, the insulating rod 1 is inserted into the hole 2c, and n (eight in this example) dies 6 arranged around the terminal fittings 2a and 2b as shown in FIG. The terminal fittings 2a and 2b are compressed by applying a compressive force evenly in a linear direction connecting the center and the centers of the disk-like terminal fittings 2a and 2b. Thereby, the said hole 2c deform | transforms and the insulation stick | rod 1 and the terminal metal fittings 2a and 2b are fixed.
As described above, by compressing the terminal fittings 2a and 2b with the die 6, a sufficient frictional force can be obtained between the insulating rod 1 and the terminal fittings 2a and 2b, and the reaction force of the
[0011]
Here, the number of divisions n in the circumferential direction of the terminal fittings 2a and 2b is preferably 4 or more. If the number of divisions is less than 4, the zinc oxide element 3 may come off between the insulating rods 1. However, if n is excessively large, the width of the die becomes too narrow and the terminal fittings 2a and 2b cannot be sufficiently plastically deformed, and the tensile strength between the insulating rod 1 and the terminal fittings 2a and 2b is sufficient. I can't let go. Therefore, the number of divisions n is preferably up to about 8. In order to uniformly compress the terminal fittings 2a and 2b, it is preferable to place the dies 6 at point-symmetrical positions with respect to the centers of the terminal fittings 2a and 2b, and therefore n should be an even number.
[0012]
In order to confirm the effect of the present embodiment, the terminal fittings having a diameter of approximately φ60 mm and a thickness of 39 mm are used, and the FRP rods having a diameter of 3 mm are used as the insulating rods as shown in FIG. The FRP rod was inserted into a hole of φ3.2 mm provided in the terminal fitting to a depth of 25 mm, and the periphery of the FRP rod was compressed with a die as shown in FIG. 2, and the load (tensile strength) at which the FRP rod fell out was measured.
As a result, a tensile strength of about 2000 kgf or more was obtained when compressed to 85 bar with the die shown in FIG.
The compression resistance (spring pressure) of the zinc oxide element is a maximum of several hundred Kgf, and it was confirmed that sufficient strength can be obtained by the compression connection.
In addition, apply Araldite adhesive inside the hole to insert the insulating rod, insert the insulating rod, compress it as before before the adhesive hardens, and leave it at room temperature until the adhesive is fully dried As a result of tensile testing, the tensile strength was about 3000 kgf, which was higher than that compressed without applying an adhesive.
This is because the adhesive fills the gap between the compressed and plastically deformed insertion hole and the insulating rod and hardens, and contacts the metal fitting around the entire circumference of the insulating rod, so that the entire circumference of the insulating rod contacts the metal fitting only by compression. In other words, the contact surface between the metal fitting and the insulating rod that had a gap increased, and the tensile load increased due to the increase in the number of surfaces that bear the heavy load when the insulating rod was subjected to a tensile load.
[0013]
FIG. 3 is a view showing another arrangement example of the holes 2c on the terminal fittings 2a and 2b, and shows a view of the terminal fitting from the axial direction of the lightning arrester.
In FIG. 3, the terminal fittings 2a and 2b are divided into eight in the circumferential direction, and two holes 2c (16 holes in this example in total) for inserting the insulating bars are provided symmetrically on both sides of each of the eight dividing points. Yes. That is, when the number of divisions is n, n points are arranged at equal intervals on the same circumference having a center that coincides with the center of the disk-shaped terminal fittings 2a and 2b. Thus, in the vicinity of both sides of the n points, there are provided two holes 2c into which the insulating rods 1 are inserted symmetrically around the n points. The distance between the two holes 2c needs to be within a distance that can be compressed by one die.
Then, the insulating rod 1 is inserted into the hole 2c, and n points (8 in this example) dies 6 arranged around the terminal fittings 2a and 2b as shown in FIG. The terminal fittings 2a and 2b are compressed by applying a compressive force evenly in the linear direction connecting the centers of the disk-shaped terminal fittings 2a and 2b.
By configuring as described above, the number of the insulating rods 1 can be doubled as shown in FIG. 1 without excessively increasing the number of n divisions on the circumference, and the tensile strength can be increased accordingly. Can be increased.
[0014]
【The invention's effect】
As described above, in the present invention, the following effects can be obtained.
(1) The terminal fitting was divided into n in the circumferential direction, and n holes were provided at equal intervals on the same circumference on the terminal fitting, and an insulating rod was inserted into the hole, and divided into n from the outer periphery. Since the terminal fitting is compressed in the direction of the center point of the terminal fitting with a die and the insulating rod is fixed to the terminal fitting, the terminal fitting and the insulating rod can be firmly fixed without increasing the number of parts. For this reason, an inexpensive and highly reliable lightning arrester can be obtained.
(2) n points are arranged at equal intervals on the same circumference on the terminal fitting, two holes are provided in the vicinity of both sides of the n points, and an insulating rod is inserted into the hole, By fixing as described above, the number of insulating rods can be doubled and the tensile strength can be increased without increasing the number of divisions of n.
(3) By setting n to an even number, it is possible to uniformly compress the terminal fitting. Further, by setting n to 4 to 8, it is possible to prevent the lightning protection element from falling off and to sufficiently plastically deform the terminal fitting with the die.
(4) The tensile strength can be increased by compressing after applying an adhesive to the insulating rod insertion hole.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a lightning arrester according to an embodiment of the present invention.
FIG. 2 is a diagram showing the arrangement of dies when an insulating rod is compressed and fixed to a terminal fitting.
FIG. 3 is a view showing another arrangement example of holes arranged in the terminal fitting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Insulating rod 2a, 2b Terminal metal fitting 2c Hole 3
5 Mold material
Claims (5)
円盤状の端末金具を円周方向にｎ分割し、該端末金具の中心と一致する中心を持つ同一円周上に均等の間隔でｎ個の穴を設け、
上記穴に絶縁棒を挿入し、端末金具外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して絶縁棒を端末金具に固着した
ことを特徴とする避雷装置。A lightning protection device in which lightning protection elements are stacked between terminal metal fittings, terminal metal fittings at both ends are connected with an insulating rod, and the outer periphery of the lightning protection device and the insulating rod is molded with resin,
A disk-shaped terminal fitting is divided into n parts in the circumferential direction, and n holes are provided at equal intervals on the same circumference having a center coinciding with the center of the terminal fitting,
A lightning arrester characterized by inserting an insulating rod into the hole, compressing the end fitting in the direction of the center point of the end fitting with a die divided into n from the outer periphery of the end fitting, and fixing the insulating rod to the end fitting.
円盤状の端末金具を円周方向にｎ分割し、該端末金具の中心と一致する中心を持つ同一円周上に均等の間隔でｎ個の点を配置し、上記円周上であって、上記ｎ個の点の両側の近傍に２つの穴を設け、
上記穴に絶縁棒を挿入し、端末金具外周からｎ分割されたダイスで端末金具の中心点方向に端末金具を圧縮して絶縁棒を端末金具に固着した
ことを特徴とする避雷装置。A lightning protection device in which lightning protection elements are stacked between terminal metal fittings, terminal metal fittings at both ends are connected with an insulating rod, and the outer periphery of the lightning protection device and the insulating rod is molded with resin,
A disk-shaped terminal fitting is divided into n parts in the circumferential direction, n points are arranged at equal intervals on the same circumference having a center coinciding with the center of the terminal fitting, and on the circumference, Two holes are provided near both sides of the n points,
A lightning arrester characterized by inserting an insulating rod into the hole, compressing the end fitting in the direction of the center point of the end fitting with a die divided into n from the outer periphery of the end fitting, and fixing the insulating rod to the end fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| JP2001152207A JP3609749B2 (en) | 2001-05-22 | 2001-05-22 | Lightning arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001152207A JP3609749B2 (en) | 2001-05-22 | 2001-05-22 | Lightning arrester |
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| JP3609749B2 true JP3609749B2 (en) | 2005-01-12 |
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