JPH0644522B2 - Reinforcement structure of withstand voltage insulation cylinder in lightning insulator - Google Patents

Description

【発明の詳細な説明】 発明の目的 （産業上の利用分野） この発明は避雷素子を内蔵し、特に架空送電線用の碍子
装置に使用される避雷碍子に関するものであり、さらに
詳しくは放圧孔を備えた耐圧絶縁筒の補強構造に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lightning arrestor with a built-in lightning protection element, and more particularly to a lightning protection insulator used in an insulator device for an overhead transmission line. The present invention relates to a reinforcing structure for a pressure-proof insulating cylinder having holes.

（従来の技術） 従来、避雷素子を内蔵した避雷碍子として、ＦＲＰ等の
機械的強度に優れた耐圧絶縁筒の上下両端にそれぞれ筒
状の接地側電極及び課電側電極を嵌合固定するととも
に、両電極間には電圧−電流特性が非直線性の避雷素子
を収容固定し、避雷素子と耐圧絶縁筒との間及び耐圧絶
縁筒の外周にゴムモールドを設け、さらに、前記耐圧絶
縁筒の外周には、予期しない大規模雷撃によって避雷素
子が異常放電して生ずる高温・高圧のアークを碍子外部
に放出するための放圧孔を形成したものが提案されてい
る。(Prior Art) Conventionally, as a lightning arrestor with a built-in lightning protection element, a cylindrical ground-side electrode and a power-supply-side electrode are fitted and fixed to the upper and lower ends of a pressure-resistant insulating cylinder having excellent mechanical strength such as FRP. Between the electrodes, a lightning protection element having a non-linear voltage-current characteristic is housed and fixed, and a rubber mold is provided between the lightning protection element and the withstand voltage insulating cylinder and on the outer circumference of the withstand voltage insulating tube. It has been proposed to form a pressure relief hole on the outer periphery for discharging a high-temperature, high-pressure arc generated by abnormal lightning of a lightning arrester element due to an unexpected large-scale lightning stroke to the outside of the insulator.

（考案が解決しようとする問題点） 短絡電流が非常に大きい有効接地系統、あるいは非有効
接地系統での特殊ケースでは数万アンペアの短絡電流を
考える必要がある。例えば、線路電圧が３３〜７７ＫＶ
の送電線路では、故障時の短絡電流１０〜２５ＫＡ、
０．１〜０．１５秒であるのに対し、線路電圧が１５４
〜５００ＫＶの送電線路では、同じ短絡電流が３０〜５
０ＫＡ、０．１〜０．２秒となり、格段に設計上厳しい
条件となる。従って、このような線路に避雷碍子を適用
しようとすると耐圧絶縁筒のみでは放圧時において強度
が不足するという問題がある。すなわち、大規模雷撃時
のアークの放出による放圧孔縁部への応力集中により耐
圧絶縁筒には割れが生じて、この割れが長手方向に進行
して耐圧絶縁筒が破壊する。また、所要の強度を得るに
は肉厚を大幅に増加させる必要が生じるため、碍子が大
型化する等の問題がある。(Problems to be solved by the invention) In a special case of an active earthing system or a non-effective earthing system where the short circuit current is very large, it is necessary to consider a short circuit current of tens of thousands of amperes. For example, the line voltage is 33 to 77 KV
In the power transmission line of, short circuit current 10-25KA at the time of failure,
It takes 0.1 to 0.15 seconds, but the line voltage is 154
In the transmission line of ~ 500 KV, the same short circuit current is 30 ~ 5.
0KA, 0.1 to 0.2 seconds, which is a severe design condition. Therefore, when the lightning protection insulator is applied to such a line, there is a problem that the strength is insufficient at the time of pressure release only with the pressure resistant insulating cylinder. That is, stress concentration on the edge portion of the pressure release hole due to arc discharge during a large-scale lightning strike causes a crack in the pressure-resistant insulating cylinder, and the crack progresses in the longitudinal direction to destroy the pressure-resistant insulating cylinder. Further, in order to obtain the required strength, it is necessary to significantly increase the wall thickness, which causes a problem such as an increase in the size of the insulator.

発明の構成 （問題点を解決するための手段） この発明は前記問題点を解決するため、放圧孔を形成し
た耐圧絶縁筒の上下両端にそれぞれ筒状の接地側電極及
び課電側電極を嵌合固定するとともに、両電極間には電
圧−電流特性が非直線性の避雷素子を収容固定し、避雷
素子と耐圧絶縁筒との間及び耐圧絶縁筒の外周にゴムモ
ールドを設けた避雷碍子において、前記耐圧絶縁筒の外
周に放圧孔を除いてあるいは放圧孔も含めて、補強繊維
糸又は補強繊維布で巻回してその端部を仮止めし、こう
して形成した補強繊維層の外周を前記ゴムモールドによ
り一体にモールドするという構成を採用している。Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention has a cylindrical ground-side electrode and a power-supply-side electrode at the upper and lower ends of a pressure-resistant insulating cylinder having pressure relief holes. A lightning arrestor with a lightning protection element that has a non-linear voltage-current characteristic accommodated and fixed between both electrodes, and a rubber mold is provided between the lightning protection element and the withstand voltage insulation tube and on the outer circumference of the withstand voltage insulation tube. In the outer periphery of the pressure-resistant insulating cylinder, excluding or including the pressure-release holes, is wound with a reinforcing fiber thread or a reinforcing fiber cloth to temporarily fix the ends thereof, and the outer periphery of the reinforcing fiber layer thus formed. Is integrally molded with the rubber mold.

（作用） この発明は前記手段を採用したため、予期しない大規模
雷撃によって避雷素子が異常放電して生ずる高温・高圧
のアークの放圧時に放圧孔縁部に応力集中が生じて耐圧
絶縁筒に割れが生じても、同耐圧絶縁筒の外周に設けた
補強繊維層によって補強され、耐圧絶縁筒内の圧力が負
担される。このため、耐圧絶縁筒の長手方向への割れの
進行が防止される。また、所要の耐圧強度を得る場合、
耐圧絶縁筒の外周に補強繊維層を設けたので、同絶縁筒
の肉厚を薄くして避雷碍子を大幅に軽量化できるため、
避雷碍子装置のブラケット、吊下金具への振動時の応力
集中が防止される。(Operation) Since the present invention employs the above-mentioned means, stress concentration occurs at the edge of the pressure release hole at the time of releasing the pressure of a high temperature / high pressure arc caused by an abnormal discharge of the lightning arrester due to an unexpected large-scale lightning strike, so that the pressure resistant insulating cylinder Even if a crack occurs, it is reinforced by the reinforcing fiber layer provided on the outer periphery of the pressure-proof insulating cylinder, and the pressure in the pressure-proof insulating cylinder is borne. For this reason, the progress of cracking in the longitudinal direction of the pressure-proof insulating cylinder is prevented. Also, in order to obtain the required pressure resistance,
Since the reinforcing fiber layer is provided on the outer periphery of the pressure-proof insulating cylinder, the thickness of the insulating cylinder can be reduced to significantly reduce the weight of the lightning protection insulator.
It is possible to prevent stress concentration on the bracket and suspension metal fittings of the lightning arrester device during vibration.

さらに、本発明は補強繊維層の端部を耐圧絶縁筒に仮止
めして、ゴムモールドにより一体に包蔵したので、樹脂
含浸や、切断加工等の行程が省略され、製作が容易にな
る。Further, according to the present invention, the end portion of the reinforcing fiber layer is temporarily fixed to the pressure-resistant insulating cylinder and is integrally encapsulated by the rubber mold, so that steps such as resin impregnation and cutting are omitted, and the manufacturing is facilitated.

（実施例） 以下、この発明を具体化した一実施例を図面に従って説
明する。第２図に示すように、塔体１に取着された接地
側の吊下金具２の左右両端には吊下碍子３，３が回動可
能に垂下され、両吊下碍子３，３の下端には中央に放電
電極５を有する電線側の吊下金具４が取着され、この吊
下金具４にはクランプ６を介して電線７が吊下支持され
ている。又、前記吊下金具２の中央に取着されたブラケ
ット８には避雷碍子１０が取付けられている。(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, suspension insulators 3, 3 are rotatably suspended at the left and right ends of the ground-side suspension metal fitting 2 attached to the tower body 1, and the suspension insulators 3, 3 A wire-side hanging metal fitting 4 having a discharge electrode 5 in the center is attached to the lower end, and an electric wire 7 is suspended and supported on the hanging metal fitting 4 via a clamp 6. A lightning protection insulator 10 is attached to the bracket 8 attached to the center of the suspension fitting 2.

次に、避雷碍子１０について説明すると、第１，第３図
に示すように機械的強度に優れ、耐熱性、耐圧性のある
強化プラスチック（ＦＲＰ）等の材料よりなる耐圧絶縁
筒１１の上端には、内面に段差部１２ａを有し、かつ、
上部外周に取付フランジ１２ｂを有する筒状の接地側電
極１２が嵌合接着され、下端には底部中央寄りに円筒状
の係合筒１３ａを突設した有底筒状の課電側電極１３が
嵌合接着されている。同課電側電極１３下面に設けた取
付片１３ｂには放電電極１４が取付けられ、第２図に示
すように前記吊下金具４に設けた放電電極５との間に気
中放電間隙Ｇを形成している。Next, the lightning protection insulator 10 will be described. As shown in FIGS. 1 and 3, the upper end of a pressure resistant insulating cylinder 11 made of a material such as reinforced plastic (FRP) having excellent mechanical strength, heat resistance, and pressure resistance is provided. Has a step portion 12a on the inner surface, and
A cylindrical grounding-side electrode 12 having a mounting flange 12b is fitted and adhered on the outer periphery of the upper part, and a cylindrical bottomed power-supplying electrode 13 having a cylindrical engaging cylinder 13a protruding toward the center of the bottom is provided at the lower end. Fitted and bonded. A discharge electrode 14 is attached to a mounting piece 13b provided on the lower surface of the power-supply side electrode 13, and an air discharge gap G is provided between the discharge electrode 14 and the discharge electrode 5 provided on the hanging fitting 4, as shown in FIG. Is forming.

第３図に示すように前記耐圧絶縁筒１１内には素子組体
１５が収容されている。この素子組体１５は酸化亜鉛
（ＺｎＯ）を主材とする電圧−電流特性が非直線性の避
雷素子１６を複数直列に積層するとともに、上下両端の
避雷素子１６にそれぞれ上部及び下部の素子押え金具１
７，１８を接合し、避雷素子１６及び両素子押え金具１
７，１８の外周にＥＰＤＭゴムよりなる被覆１９を設け
て構成されている。そして、同素子組体１５の下端は、
下部の素子押え金具１８に形成した突部１８ａを前記課
電側電極１３の係合筒１３ａに係合して位置規制されて
いる。As shown in FIG. 3, an element assembly 15 is housed in the withstand voltage insulating cylinder 11. This element assembly 15 has a plurality of lightning protection elements 16 mainly made of zinc oxide (ZnO) and having a non-linear voltage-current characteristic, which are stacked in series. Metal fittings 1
7 and 18 are joined together, and the lightning arrester element 16 and both element holding metal fittings 1
A coating 19 made of EPDM rubber is provided on the outer circumferences of 7 and 18. The lower end of the element assembly 15 is
The projection 18a formed on the lower element pressing fitting 18 is engaged with the engagement cylinder 13a of the power-supply-side electrode 13 to regulate the position.

前記接地側電極１２の内周面に形成した雌ねじ１２ｃに
は、第３図に示すように外周面に雄ねじ２０ａを有する
締付金具２０が螺合されている。同締付金具２０中央の
挿通孔２０ｂには筒状の絶縁スペーサ２１を介して端子
金具２２が貫通固定され、素子組体１５上部の素子押え
金具１７との間には、素子組体１５を同端子金具２２と
課電側電極１３との間に圧着固定するとともに、避雷素
子１６に接触圧を付与するばね２３が介在されている。
なお、ばね２３にはシャント２４が複数（この実施例で
は３）介在され、電気的接続を良くしている。As shown in FIG. 3, a tightening fitting 20 having a male screw 20a on the outer peripheral surface is screwed into the female screw 12c formed on the inner peripheral surface of the ground electrode 12. A terminal metal fitting 22 is fixed through the insertion hole 20b in the center of the fastening metal fitting 20 through a cylindrical insulating spacer 21, and the element assembly 15 is provided between the element holding metal fitting 17 above the element assembly 15. A spring 23 is provided between the terminal fitting 22 and the power-supply-side electrode 13 for crimping and fixing, and a spring 23 for applying a contact pressure to the lightning protection element 16 is interposed.
A plurality of shunts 24 (three in this embodiment) are interposed in the spring 23 to improve electrical connection.

前記耐圧絶縁筒１１の上部、中間部２ヶ所及び下部に
は、異常時のアークを放出するための放圧孔１１ａが直
径方向に９０°ごと（第４図参照）に形成されている。
同放圧孔１１ａの長さＬは幅Ｓの５倍以内が好ましく、
又、各放圧孔１１ａの縦方向の間隔は耐圧絶縁筒１１内
径の６倍以内とするのが好ましい。さらに、放圧孔１１
ａを接地側電極１２及び課電側電極１３の近傍とその中
間部に設けることにより、アークを効率良く放出でき
る。又、第１図に示すように、同耐圧絶縁筒１１の外周
面には各放圧孔１１ａにかからないように、ガラス繊維
糸、炭素繊維あるいはアラミド（商品名、ケプラー）等
の一本の繊維糸２５ａ（５〜６本の撚糸で、繊維径が
０．１mm程度のものが望ましい）をコイル状に連続して
巻回し、補強繊維層２５を形成している。この繊維糸２
５ａの両端部は例えば瞬間接着剤により戻らないように
耐圧絶縁筒１１の表面に仮止めされている。この補強繊
維層２５の厚さは３〜５mmが望ましい。又、この補強繊
維糸２５ａは脱脂後、プライマー処理され、さらに、加
硫接着剤（図示略）をスプレー等により塗布してゴムモ
ールド２６と一体化するようになっている。Pressure release holes 11a for emitting an arc at abnormal times are formed at 90 ° intervals (see FIG. 4) in the diametrical direction at the upper part, two intermediate parts and the lower part of the pressure-proof insulating cylinder 11.
The length L of the pressure release hole 11a is preferably within 5 times the width S,
Further, it is preferable that the space between the pressure release holes 11a in the vertical direction be within 6 times the inner diameter of the pressure-proof insulating cylinder 11. Further, the pressure release hole 11
By providing a in the vicinity of the ground-side electrode 12 and the charging-side electrode 13 and in the middle thereof, the arc can be efficiently emitted. Further, as shown in FIG. 1, one fiber such as glass fiber yarn, carbon fiber or aramid (trade name, Kepler) is provided on the outer peripheral surface of the pressure-proof insulating cylinder 11 so as not to cover the pressure release holes 11a. A reinforcing fiber layer 25 is formed by continuously winding a yarn 25a (5 to 6 twisted yarns, preferably having a fiber diameter of about 0.1 mm) in a coil shape. This fiber thread 2
Both ends of 5a are temporarily fixed to the surface of the pressure-resistant insulating cylinder 11 so as not to return by an instant adhesive, for example. The thickness of the reinforcing fiber layer 25 is preferably 3-5 mm. The reinforcing fiber yarn 25a is degreased, then treated with a primer, and further applied with a vulcanizing adhesive (not shown) by spraying or the like to be integrated with the rubber mold 26.

前記耐圧絶縁筒１１と素子組体１５との間、接地側電極
１２と端子金具２２との間及び耐圧絶縁筒１１の外側に
はＥＰＤＭゴムよりなるゴムモールド２６が形成され、
接地側電極１２の下部外周面及び課電側電極１３の上部
外周面にまで延在され、外周にはひだ２６ａが一体に形
成されている。このゴムモールド２６により本発明では
前記補強繊維層２５全体を一体に包蔵固定するようにし
ている。A rubber mold 26 made of EPDM rubber is formed between the pressure-resistant insulating cylinder 11 and the element assembly 15, between the ground side electrode 12 and the terminal fitting 22, and on the outer side of the pressure-resistant insulating cylinder 11.
It extends to the lower outer peripheral surface of the ground side electrode 12 and the upper outer peripheral surface of the voltage application side electrode 13, and a fold 26a is integrally formed on the outer periphery. In the present invention, the rubber mold 26 is used to integrally enclose and fix the entire reinforcing fiber layer 25.

又、ゴムモールド２６には第４図に示すように前記耐圧
絶縁筒１１の放圧孔１１ａと対応する位置に放圧口２６
ｂが設けられている。As shown in FIG. 4, the rubber mold 26 is provided with a pressure release port 26 at a position corresponding to the pressure release hole 11a of the pressure resistant insulating cylinder 11.
b is provided.

第２図に示すように前記ブラケット８の一側には図示し
ないアーキングリング腕部を介して、前記上部の放圧口
２６ｂと対応するようにアーキングリング２８が設けら
れている。一方、前記課電側電極１３の取付片１３ｂに
も図示しないアーキングリング腕部を介して、前記下部
の放圧口２６ｂとほぼ対応するようにアーキングリング
２８が設けられている。As shown in FIG. 2, an arcing ring 28 is provided on one side of the bracket 8 via an arcing ring arm (not shown) so as to correspond to the pressure release port 26b in the upper portion. On the other hand, an arcing ring 28 is also provided on the attachment piece 13b of the power-supply-side electrode 13 via an arcing ring arm portion (not shown) so as to substantially correspond to the lower pressure release port 26b.

次に、前記のように構成した碍子装置についてその作用
を説明する。Next, the operation of the insulator device configured as described above will be described.

今、雷撃により電線７に雷サージが侵入すると、電流は
電線７からクランプ６→吊下金具４→放電電極５から気
中放電間隙Ｇを介して避雷碍子１０の放電電極１４にア
ーク放電され、課電側電極１３から下部の素子押え金具
１８を経て避雷素子１６に流れ、さらに上部の素子押え
金具１７→シャント２４→端子金具２２→吊下金具２を
経て塔体１から大地へと流れる。これに伴う続流は避雷
素子１６により遮断される。Now, when a lightning surge enters the electric wire 7 due to a lightning stroke, a current is arc-discharged from the electric wire 7 to the discharge electrode 14 of the lightning protection insulator 10 through the air discharge gap 5 from the clamp 6 → the hanging metal member 4 → the discharge electrode 5, The current flows from the power-supply-side electrode 13 to the lightning protection element 16 via the lower element holding metal fitting 18, and further flows from the tower body 1 to the ground via the upper element holding metal fitting 17 → shunt 24 → terminal metal fitting 22 → hanging metal fitting 2. The accompanying current is interrupted by the lightning protection element 16.

又、予期しない大規模雷撃によって避雷素子１６が異常
放電して導通状態となり高温・高圧のアークが発生する
と、耐圧絶縁筒１１の放圧孔１１ａ付近の被覆１９の一
部及びゴムモールド２６の一部が軟化又は溶融破壊さ
れ、高圧のガスによって飛散され、外部に通ずるアーク
放出路が強制的に形成される。避雷碍子１０外部に放出
されたアークは両アーキングリング２８間へ移行され、
上下互に繋がる。このアークにより放圧孔１１ａ縁部に
応力集中が生じて耐圧絶縁筒１１に割れが生じても、同
絶縁筒１１の外周に巻回した補強繊維層２５によって補
強されていることから、耐圧絶縁筒１１の内圧力が負担
される。このため、耐圧絶縁筒１１の長手方向への割れ
の進行、破壊が防止される。Further, when the lightning arrester 16 is abnormally discharged due to an unexpected large-scale lightning strike and becomes in a conductive state and a high-temperature / high-voltage arc is generated, a part of the coating 19 near the pressure-release hole 11a of the pressure-proof insulating cylinder 11 and one part of the rubber mold 26. The portion is softened or melted and broken, and is scattered by the high-pressure gas, so that an arc discharge path communicating with the outside is forcibly formed. The arc emitted to the outside of the lightning protection insulator 10 is transferred between both arcing rings 28,
Connect to each other. Even if the arc concentrates stress on the edge of the pressure release hole 11a and cracks the pressure-resistant insulating tube 11, since it is reinforced by the reinforcing fiber layer 25 wound around the outer periphery of the pressure-insulating tube 11, the pressure-resistant insulating tube 11 is reinforced. The internal pressure of the cylinder 11 is borne. For this reason, cracking and breakage of the withstand voltage insulating cylinder 11 in the longitudinal direction are prevented.

又、本発明では耐圧絶縁筒１１の外周に補強繊維層２５
を設けているので、所要の耐圧強度を得る場合、耐圧絶
縁筒１１の肉厚を薄くして避雷碍子１０を小型軽量化で
きる。Further, in the present invention, the reinforcing fiber layer 25 is provided on the outer periphery of the pressure resistant insulating cylinder 11.
Therefore, in order to obtain a required withstand voltage strength, the lightning protection insulator 10 can be made smaller and lighter by reducing the wall thickness of the withstand voltage insulating cylinder 11.

さらに、本発明では補強繊維層２５を形成する繊維糸２
５ａの端部を耐圧絶縁筒１１に仮止めして、ゴムモール
ド２６のモールド時に該モールド２６により前記補強繊
維層２５を一体に包蔵したので、樹脂含浸や、切断加工
等の固定・成形行程が省略され、ゴムモールド２６の成
形行程を利用して耐圧前記筒１１に補強繊維層２５が固
定され、製作が容易になる。Further, in the present invention, the fiber yarn 2 forming the reinforcing fiber layer 25
Since the end portion of 5a is temporarily fixed to the pressure-resistant insulating cylinder 11 and the reinforcing fiber layer 25 is integrally enclosed by the mold 26 when the rubber mold 26 is molded, the fixing / molding process such as resin impregnation and cutting process can be performed. By omitting this, the reinforcing fiber layer 25 is fixed to the pressure resistant cylinder 11 by utilizing the molding process of the rubber mold 26, which facilitates manufacturing.

ところで、本願出願人は実願昭６０−２８１４００号に
おいて既に耐圧絶縁筒の外周部に補強リングを設ける構
造のものを提案しており、その中で補強繊維糸を耐圧絶
縁筒の外周部に巻回した後、樹脂により一体的に包蔵す
る技術を開示したが、この先願はゴムモールド２６と別
に樹脂により繊維層を包蔵しているので、製造行程が増
えるという難点がある。By the way, the applicant of the present application has already proposed in Japanese Patent Application No. 60-281400 a structure in which a reinforcing ring is provided on the outer peripheral portion of a pressure resistant insulating tube, in which a reinforcing fiber yarn is wound around the outer peripheral portion of the pressure resistant insulating tube. A technique of integrally enclosing with a resin after turning is disclosed. However, in this prior application, since the fiber layer is encased with a resin separately from the rubber mold 26, there is a drawback that the number of manufacturing processes is increased.

なお、この発明は次のように実施してもよい。The present invention may be implemented as follows.

（１）前記補強繊維糸２５ａに代えて、補強繊維布（図
示略）を使用すること。この補強繊維布の厚さを例えば
０．２mm程度とし、巻回数を２５回程度とすると、補強
繊維層２５の厚さは５mm程度となる。(1) Use a reinforcing fiber cloth (not shown) in place of the reinforcing fiber yarn 25a. When the thickness of the reinforcing fiber cloth is, for example, about 0.2 mm and the number of windings is about 25, the thickness of the reinforcing fiber layer 25 is about 5 mm.

（２）耐圧絶縁筒１１の強度要請が極めて大きいとき
は、放圧孔１１ａと対応する部分にも補強繊維糸２５ａ
を疎らに巻回して、補強繊維層２５を形成してもよい。
この場合、補強繊維層２５が通気性を有しているので、
放圧初期に放圧孔１１ａから容易に放圧され、放圧孔１
１ａに対応する繊維層２５はやがて圧力と熱により切断
される。(2) When the strength requirement of the pressure resistant insulating cylinder 11 is extremely large, the reinforcing fiber yarn 25a is also applied to the portion corresponding to the pressure release hole 11a.
May be sparsely wound to form the reinforcing fiber layer 25.
In this case, since the reinforcing fiber layer 25 has air permeability,
The pressure is easily released from the pressure release hole 11a at the initial stage of the pressure release.
The fiber layer 25 corresponding to 1a is eventually cut by pressure and heat.

発明の効果 以上詳述したように、この発明は耐圧絶縁筒の外周に補
強繊維層を設けたので、予期しない大規模雷撃によって
避雷素子が異常放電し続流によって生じる高温・高圧の
アークの放圧時に放圧孔縁部に応力集中が生じて耐圧絶
縁筒に割れが生じても、補強繊維層によってこの放出圧
力を負担して耐圧絶縁筒の長手方向への割れの進行を防
止でき、耐圧絶縁筒の強度を向上できるとともに、耐圧
絶縁筒の肉厚を薄くして避雷碍子の小型軽量化を図れる
優れた効果がある。Effects of the Invention As described in detail above, according to the present invention, since the reinforcing fiber layer is provided on the outer periphery of the pressure-proof insulating cylinder, the lightning protection element is abnormally discharged by an unexpected large-scale lightning strike and the arc of high temperature and high pressure generated by the follow current is discharged. Even if stress concentration occurs at the edge of the pressure relief hole when pressure is applied and the pressure-resistant insulating tube cracks, the reinforcing fiber layer bears this discharge pressure and prevents the pressure-resistant insulating tube from cracking in the longitudinal direction. There is an excellent effect that the strength of the insulating cylinder can be improved and the wall thickness of the withstand voltage insulating cylinder can be reduced to reduce the size and weight of the lightning protection insulator.

又、本発明は耐圧絶縁筒に対し補強繊維層を仮止めして
ゴムモールドにより包蔵固定したので、その固定を簡単
に行うことができ、ひいては避雷碍子の製作を容易に行
い、製品のコストダウンを図ることができる効果があ
る。Further, according to the present invention, since the reinforcing fiber layer is temporarily fixed to the pressure-proof insulating cylinder and is encased and fixed by the rubber mold, the fixing can be easily performed, which in turn facilitates the production of the lightning protection insulator, which reduces the cost of the product. There is an effect that can be achieved.

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

第１図はこの発明を具体化した一実施例を示す斜視図、
第２図は避雷碍子を装着した碍子装置を示す正面図、第
３図は避雷碍子の縦断面図、第４図は第３図のＡ−Ａ線
端面図、第５図は第３図のＢ−Ｂ線端面図、第６図は第
３図のＣ−Ｃ線端面図、第７図は第３図のＤ−Ｄ線端面
図である。 １１……耐圧絶縁筒、１１ａ……放圧孔、１２……接地
側電極、１３……課電側電極、１６……避雷素子、２５
……補強繊維層、２５ａ……補強繊維糸、２６……ゴム
モールド。FIG. 1 is a perspective view showing an embodiment embodying the present invention,
2 is a front view showing an insulator device equipped with a lightning arrester, FIG. 3 is a longitudinal sectional view of the lightning insulator, FIG. 4 is an end view taken along the line AA of FIG. 3, and FIG. FIG. 6 is an end view taken along the line BB of FIG. 3, FIG. 6 is an end view taken along the line CC of FIG. 3, and FIG. 7 is an end view taken along the line DD of FIG. 11 ... Withstand voltage insulating cylinder, 11a ... Pressure release hole, 12 ... Grounding side electrode, 13 ... Charging side electrode, 16 ... Lightning arrester element, 25
... Reinforcing fiber layer, 25a ... Reinforcing fiber yarn, 26 ... Rubber mold.

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】放圧孔（１１ａ）を形成した耐圧絶縁筒
（１１）の上下両端にそれぞれ筒状の接地側電極（１
２）及び課電側電極（１３）を嵌合固定するとともに、
両電極（１２，１３）間には電圧−電流特性が非直線性
の避雷素子（１６）を収容固定し、避雷素子（１６）と
耐圧絶縁筒（１１）との間及び耐圧絶縁筒（１１）の外
周にゴムモールド（２６）を設けた避雷碍子において、
前記耐圧絶縁筒（１１）の外周に放圧孔（１１ａ）を除
いてあるいは放圧孔（１１ａ）も含めて、補強繊維糸
（２５ａ）又は補強繊維布で巻回してその端部を仮止め
し、こうして形成した補強繊維層（２５）の外周を前記
ゴムモールド（２６）により一体にモールドしたことを
特徴とする避雷碍子における耐圧絶縁筒の補強構造。1. A cylindrical ground-side electrode (1) at each of the upper and lower ends of a pressure-resistant insulating cylinder (11) having pressure relief holes (11a).
2) and the charging side electrode (13) are fitted and fixed,
A lightning arrester element (16) having a non-linear voltage-current characteristic is housed and fixed between both electrodes (12, 13), and is provided between the lightning arrester element (16) and the withstand voltage insulation tube (11) and withstand voltage insulation tube (11). ) In the lightning insulator having a rubber mold (26) on the outer periphery,
Excluding the pressure release hole (11a) or including the pressure release hole (11a) on the outer periphery of the pressure-resistant insulating cylinder (11), it is wound with a reinforcing fiber yarn (25a) or a reinforcing fiber cloth and its end is temporarily fixed. Then, the reinforcing structure of the withstand voltage insulating cylinder in the lightning insulator is characterized in that the outer periphery of the reinforcing fiber layer (25) thus formed is integrally molded by the rubber mold (26). 【請求項２】耐圧絶縁筒（１１）の外周には一本の補強
撚糸がコイル状に連続して巻回されている特許請求の範
囲第１項に記載の避雷碍子における耐圧絶縁筒の補強構
造。2. Reinforcement of a pressure resistant insulating cylinder in a lightning protection insulator according to claim 1, wherein one reinforcing twisted yarn is continuously wound in a coil shape on the outer periphery of the pressure resistant insulating cylinder (11). Construction.