JPH023227Y2 - - Google Patents

Description

【考案の詳細な説明】 考案の目的 （産業上の利用分野） 本考案は送配電線路における雷閃絡時の続流を
抑制、遮断して続流アークによる断線や碍子自体
の離断を防止する耐雷耐張碍子に関するものであ
る。[Detailed description of the invention] Purpose of the invention (industrial application field) The invention suppresses and interrupts follow-on current during lightning flash faults in power transmission and distribution lines, and prevents breakage due to follow-on arcs and separation of the insulator itself. This relates to lightning-resistant tension insulators.

（従来の技術） 従来、避雷器内蔵型耐張碍子として、実開昭56
−167430号公報あるいは実開昭57−6114号公報に
示すものが提案されているが、これらの耐張碍子
は中空碍子の両端にキヤツプ電極を嵌合固定し、
碍子の内部に限流素子と放電間隙などを配置して
両端キヤツプ電極と接続しているが、送配電線路
に過大な雷サージ、すなわち限流素子の放電耐量
以上の雷サージを受けたり、また放電耐量以下で
あつても、雷サージ放電の繰り返しや、経年、あ
るいは気密不良等の原因で限流素子が劣化してい
たりすると、爆発、飛散して、このような場合、
電線を引留めている耐張碍子が破損し、引張力に
よつて容易に離断され電線が地上へ落下するとい
う問題がある。(Prior technology) Conventionally, as a tension insulator with a built-in lightning arrester,
-167430 and Utility Model Application Publication No. 57-6114 have been proposed, but these tension-resistant insulators have cap electrodes fitted and fixed at both ends of a hollow insulator.
A current-limiting element and a discharge gap are arranged inside the insulator and connected to the cap electrodes at both ends, but the power transmission and distribution line may receive excessive lightning surges, that is, lightning surges that exceed the discharge withstand capacity of the current-limiting element, or Even if it is below the discharge withstand capacity, if the current limiting element has deteriorated due to repeated lightning surge discharges, age, or poor airtightness, it will explode and scatter.
There is a problem in that the tension insulator that holds the wires in place is damaged and is easily separated by the tensile force, causing the wires to fall to the ground.

（考案が解決しようとする問題点） 本考案は上記従来の耐張碍子に存する問題点、
すなわち単に中空碍子に避雷器を内蔵した耐張碍
子に存するごとき限流素子が劣化あるいは過大雷
サージ等により爆発し、耐張碍子が離断して電線
が地上落下するという問題点を解決しようとする
ものである。(Problems to be solved by the invention) This invention solves the problems existing in the conventional tension insulators mentioned above.
In other words, it is simply an attempt to solve the problem that the current limiting element in tension insulators, which have a lightning arrester built into the hollow insulator, explodes due to deterioration or excessive lightning surge, causing the tension insulator to rupture and the electric wire to fall to the ground. It is something.

考案の構成 （問題点を解決するための手段） 本考案は上記問題点を解消するため、筒状の碍
子本体の内壁に環状段部を形成し、この碍子本体
には前記環状段部に係止される係止部を有する棒
状導体を挿通し、この棒状導体を前記碍子本体の
一端開口部に被冠固定したキヤツプ金具に連結
し、碍子本体７の他端開口部にはキヤツプ金具を
被冠してその円筒部を前記環状段部と対応する位
置において固定し、前記棒状導体とキヤツプ金具
の内頂面との間に限流素子、放電電極及びスペー
サを直列に介在させ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 forms an annular stepped portion on the inner wall of a cylindrical insulator body, and the insulator body has a structure that engages with the annular stepped portion. A rod-shaped conductor having a locking portion is inserted through the insulator body, and this rod-shaped conductor is connected to a cap fitting fixed to the opening at one end of the insulator body, and a cap fitting is fitted to the opening at the other end of the insulator body 7. A configuration is adopted in which the cylindrical part is fixed at a position corresponding to the annular step part, and a current limiting element, a discharge electrode, and a spacer are interposed in series between the rod-shaped conductor and the inner top surface of the cap metal fitting. are doing.

（作用） 本考案は上記手段を採用したことにより、送配
電線路の雷サージによる雷インパルス過電圧が発
生した場合、限流素子の電圧電流特性の非直線性
により雷サージの大電流を放電させ、これに継続
する続流を抑制、遮断して、続流アークによる断
線や碍子自体の離断を防ぎ、かつ、限流素子の劣
化や過大雷サージによつて、万一限流素子が爆発
しても、碍子本体の限流素子収容部分はキヤツプ
金具に包蔵されているので飛散せず、また、キヤ
ツプ金具を放圧構造にすることによりキヤツプ金
具と棒状導体の係止部との間に挟着された碍子本
体部分の破損を避けることができ、さらに、万一
碍子本体が破損しても両端キヤツプ金具間は棒状
導体を介して連結が保持できるので離断しない。
従つて、碍子の電線引留機能が保持される。ま
た、本考案は限流素子を内蔵する碍子本体の外周
部がキヤツプ金具によつて覆われているので、補
修時、作業時の打撃等の外力が作用しても碍子本
体の限流素子収容部が破損されることはない。(Function) The present invention adopts the above means, so that when a lightning impulse overvoltage occurs due to a lightning surge on a power transmission/distribution line, the large current of the lightning surge is discharged due to the nonlinearity of the voltage-current characteristics of the current-limiting element. The following current is suppressed and blocked to prevent the wire from breaking due to the following arc and the insulator itself from being separated, and to prevent the current limiting element from exploding due to deterioration of the current limiting element or excessive lightning surge. Even if the current limiting element is housed in the insulator body, it will not scatter because it is enclosed in the cap metal fitting, and the cap metal fitting has a pressure release structure so that it will not be caught between the cap metal fitting and the locking part of the rod-shaped conductor. It is possible to avoid damage to the attached insulator body, and furthermore, even if the insulator body is damaged, the connection between the cap metal fittings at both ends can be maintained through the rod-shaped conductor, so that the insulator body will not be separated.
Therefore, the wire retaining function of the insulator is maintained. In addition, in this invention, the outer periphery of the insulator body containing the current limiting element is covered with a cap fitting, so even if external force such as impact during repair or work is applied, the current limiting element can be accommodated in the insulator body. No parts will be damaged.

（実施例） 以下、本考案を具体化した一実施例を図面に基
づいて説明する。(Example) Hereinafter, an example embodying the present invention will be described based on the drawings.

第３図は耐雷耐張装置全体の一例を示し、腕金
１には接地側引留具２が締着固定されている。一
方、絶縁電線Ｗを把持した電線把持具３には通常
の耐張碍子５が連結ピン４により連結され、接地
側引留具２と耐張碍子５との間には本考案の耐雷
耐張碍子６が連結ピン４により連結されている。 FIG. 3 shows an example of the entire lightning-resistant tension device, in which a ground-side retaining member 2 is fastened and fixed to the arm arm 1. On the other hand, a normal tension insulator 5 is connected to the wire gripping tool 3 that grips the insulated wire W by a connecting pin 4, and a lightning resistant tension insulator of the present invention is connected between the ground side retaining tool 2 and the tension insulator 5. 6 are connected by a connecting pin 4.

次に、前記耐雷耐張碍子６を第１図及び第２図
により説明する。 Next, the lightning-resistant tension insulator 6 will be explained with reference to FIGS. 1 and 2.

円筒状に形成された磁器製の碍子本体７の中間
部外周には笠７ａが形成されている。碍子本体７
の一端開口部には、有蓋円筒状をなすキヤツプ金
具８が嵌合され、その円筒部８ａは碍子本体７の
ほぼ中間部まで延出され、同中間部にセメント９
により固定されている。同キヤツプ金具８の内頂
面には一対の係止部８ｂが一体に形成され、連結
ピン４により前記接地側引留具２に連結される。
碍子本体７の他端開口部にはキヤツプ金具１０が
嵌合され、セメント９により固定されている。ま
た、キヤツプ金具８，１０は碍子本体７に対して
かしめなどの方法で固定させてもよい。 A shade 7a is formed on the outer periphery of the intermediate portion of the cylindrical insulator body 7 made of porcelain. Insulator body 7
A cap metal fitting 8 having a closed cylindrical shape is fitted into the opening at one end, and the cylindrical part 8a extends to approximately the middle part of the insulator body 7, and a cement 9 is inserted into the middle part.
Fixed by A pair of locking portions 8b are integrally formed on the inner top surface of the cap metal fitting 8, and are connected to the ground side retaining member 2 by a connecting pin 4.
A cap fitting 10 is fitted into the opening at the other end of the insulator body 7 and fixed with cement 9. Further, the cap fittings 8 and 10 may be fixed to the insulator body 7 by caulking or other methods.

前記碍子本体７の内部には棒状導体１１が挿通
され、この棒状導体１１の端部は前記キヤツプ金
具１０に螺合固定されている。また、碍子本体７
の内部には前記キヤツプ金具８固定用のセメント
９と対応する位置にテーパ状をなす環状段部７ｂ
が形成され、棒状導体１１の内端部に形成された
大径のテーパ状をなす係止部１１ａが硬質ゴムあ
るいは軟質金属よりなるクツシヨン１２を介して
圧接されている。 A rod-shaped conductor 11 is inserted into the inside of the insulator body 7, and the end of this rod-shaped conductor 11 is screwed and fixed to the cap fitting 10. In addition, the insulator body 7
Inside the cap metal fitting 8, there is a tapered annular stepped portion 7b at a position corresponding to the cement 9 for fixing the cap fitting 8.
is formed, and a large-diameter tapered locking portion 11a formed at the inner end of the rod-shaped conductor 11 is pressed into contact with a cushion 12 made of hard rubber or soft metal.

前記碍子本体７とキヤツプ金具８との間にはゴ
ム製のパツキン１３、Ｏリング１４が介装され、
碍子本体７とキヤツプ金具１０との間にも、Ｏリ
ング１５が介装され、碍子本体７の内部空間が気
密に保持されるようにしている。２６，２７はキ
ヤツプ金具８，１０が碍子本体７の端面へ直接押
圧されることがないように設けた硬質ゴム、又は
軟質金属等よりなるクツシヨン材である。 A rubber packing 13 and an O-ring 14 are interposed between the insulator body 7 and the cap fitting 8,
An O-ring 15 is also interposed between the insulator body 7 and the cap fitting 10, so that the internal space of the insulator body 7 is kept airtight. Reference numerals 26 and 27 are cushioning materials made of hard rubber or soft metal, which are provided so that the cap fittings 8 and 10 are not directly pressed against the end face of the insulator body 7.

前記棒状導体１１の端面には、軟質の金属薄片
１６を介して酸化亜鉛等の電圧電流特性が非直線
性の材料よりなる円柱状の限流素子１７が接合さ
れ、同限流素子１７の端面には同じく金属薄片１
８及び電極板１９を介して課電側の放電電極２０
が接合され、さらに同電極２０にはセラミツクよ
り成る円筒状のスペーサ２１を介して接地側の放
電電極２２が対向配置されている。第２図に示す
ようにこのスペーサ２１には放圧孔２１ａが複数
箇所に透設されている。又、前記接地側放電電極
２２とキヤツプ金具８との間にはコイルスプリン
グ２３が介在され、同スプリング２３の弾力によ
り前記限流素子１７、電極板１９、放電電極２
０，２２及びスペーサ２１が所定位置に直列に圧
接保持されるようにしている。前記放電電極２２
とキヤツプ金具８は短絡片２４により電気的に接
続されている。前記キヤツプ金具８の内頂面には
薄肉部８ｃが形成され、同薄肉部８ｃは前記限流
素子１７の続流遮断能力の低下や爆発時における
アークによる碍子本体７内部の異常圧力によつて
破裂して放圧し得るようにしている。前記係止部
８ｂの基端部には前記薄肉部８ｃの箸応位置に切
欠部８ｄが透設され、薄肉部８ｃの破裂を容易に
し、かつ飛脱を防止している。 A cylindrical current-limiting element 17 made of a material with non-linear voltage-current characteristics, such as zinc oxide, is joined to the end face of the rod-shaped conductor 11 via a soft metal thin piece 16. Also, there is a metal flake 1
8 and the discharge electrode 20 on the power supply side via the electrode plate 19
Further, a discharge electrode 22 on the ground side is disposed opposite to the electrode 20 with a cylindrical spacer 21 made of ceramic interposed therebetween. As shown in FIG. 2, the spacer 21 is provided with pressure release holes 21a at a plurality of locations. Further, a coil spring 23 is interposed between the ground side discharge electrode 22 and the cap metal fitting 8, and the elasticity of the spring 23 causes the current limiting element 17, the electrode plate 19, and the discharge electrode 2 to
0, 22 and the spacer 21 are held in series in a predetermined position by pressure contact. The discharge electrode 22
and the cap metal fitting 8 are electrically connected by a shorting piece 24. A thin wall portion 8c is formed on the inner top surface of the cap fitting 8, and the thin wall portion 8c is formed due to a decrease in the following current blocking ability of the current limiting element 17 or abnormal pressure inside the insulator body 7 due to an arc during an explosion. It is designed so that it can burst and release pressure. A notch 8d is transparently provided at the proximal end of the locking portion 8b at a position where the thin wall portion 8c is inserted, thereby facilitating the rupture of the thin wall portion 8c and preventing the thin wall portion 8c from falling off.

前記放電電極２０，２２は常時の線路電圧に対
しては絶縁を保ち、雷サージによる異常電圧によ
り放電が行われるよう間隙が設定されている。 The discharge electrodes 20 and 22 maintain insulation against normal line voltage, and a gap is set so that discharge occurs due to abnormal voltage caused by a lightning surge.

前記コイルスプリング２３の内部にはシリカゲ
ル等の乾燥剤パツク２５が収容され、限流素子１
７収容部の湿気を除去して内部絶縁抵抗の保持
と、限流素子１７の劣化を防止するようにしてい
る。 A desiccant pack 25 such as silica gel is housed inside the coil spring 23, and the current limiting element 1
Moisture in the housing section 7 is removed to maintain internal insulation resistance and to prevent deterioration of the current limiting element 17.

次に、前記のように構成した耐雷耐張装置につ
いてその作用を説明する。 Next, the operation of the lightning-resistant tension device constructed as described above will be explained.

送配電線路の絶縁電線Ｗに雷サージによる雷イ
ンパルス過電圧が発生すると、この雷サージは絶
縁電線Ｗ及び電線把持具３より耐雷耐張碍子６へ
印加されるが、この際電流はキヤツプ金具１０→
棒状導体１１→金属薄片１６→限流素子１７→金
属薄片１８及び電極板１９を経て放電電極２０か
ら放電電極２２へ放電され、さらに短絡片２４→
キヤツプ金具８→接地側引留具２を経て腕金１へ
流れる。 When a lightning impulse overvoltage occurs due to a lightning surge in the insulated wire W of the power transmission and distribution line, this lightning surge is applied from the insulated wire W and the wire gripper 3 to the lightning-proof tension insulator 6, but at this time, the current is transferred from the cap metal fitting 10→
Discharge occurs from the discharge electrode 20 to the discharge electrode 22 via the rod-shaped conductor 11 → metal thin piece 16 → current limiting element 17 → metal thin piece 18 and electrode plate 19, and then short-circuiting piece 24 →
It flows from the cap fitting 8 to the arm 1 via the ground side retaining fitting 2.

又、第３図のように通常の耐張碍子５と耐雷耐
張碍子６とを直列に連結した場合には、雷インパ
ルス過電圧が耐張碍子５の表面と、限流素子１７
を通つて、両放電電極２０，２２で閃絡すること
になる。そして、耐雷耐張碍子６に内蔵された限
流素子１７が電圧電流特性の非直線性により速や
かに抵抗値を減じて雷サージの大電流を放電させ
るとともに、これに継続する続流に対しては線路
電圧が低いため直ちに抵抗値を復元して絶縁を回
復するので、続流放電は抑制遮断されて電線路は
平常に復帰する。 Furthermore, when a normal tension insulator 5 and a lightning tension insulator 6 are connected in series as shown in FIG.
This causes a flashover between the discharge electrodes 20 and 22. Then, the current-limiting element 17 built into the lightning-resistant tensile insulator 6 quickly reduces the resistance value due to the non-linearity of the voltage-current characteristics and discharges the large current of the lightning surge, and also prevents the following current from continuing. Since the line voltage is low, the resistance value is immediately restored and the insulation is restored, so the follow-on discharge is suppressed and cut off, and the line returns to normal.

さて、本考案実施例においてはキヤツプ金具８
の内頂面に薄肉部８ｃを形成したので、限流素子
１７の爆発や続流遮断能力の低下による碍子本体
７内の異常圧力を外部へ放出して碍子本体７の破
損を防止することができる。 Now, in the embodiment of the present invention, the cap metal fitting 8
Since the thin wall portion 8c is formed on the inner top surface of the insulator body 7, it is possible to release abnormal pressure inside the insulator body 7 to the outside due to an explosion of the current limiting element 17 or a decrease in follow-on current blocking ability, thereby preventing damage to the insulator body 7. can.

本考案では、電線引留めによる常時の引張荷重
はキヤツプ金具８，１０に固定された碍子本体７
が保持している。 In the present invention, the constant tensile load due to the wire retention is handled by the insulator body 7 fixed to the cap fittings 8 and 10.
is held.

さらに、万一碍子本体７が破損して離断しても
棒状導体１１へ引張荷重がただちに伝達され、こ
の引張荷重が碍子本体７のテーパ状の環状段部７
ｂに対しＰ矢印方向とＱ矢印方向への圧縮力とな
つて作用し、碍子本体７の外周に固定されたキヤ
ツプ金具８により受けられるので、碍子本体７の
離断によつて電線が落下することはなく電線引留
能力を維持できる。 Furthermore, even if the insulator body 7 is damaged and separated, the tensile load is immediately transmitted to the rod-shaped conductor 11, and this tensile load is transferred to the tapered annular stepped portion 7 of the insulator body 7.
b acts as a compressive force in the direction of the arrow P and the direction of the arrow Q, and is received by the cap fitting 8 fixed to the outer periphery of the insulator body 7, so that the electric wire falls when the insulator body 7 is severed. The cable retention ability can be maintained without any problems.

また、本考案実施例においては、キヤツプ金具
８の円筒部８ａを延長してセメント９により碍子
本体７に固定し、碍子本体７の内部には前記セメ
ント９と対応する位置にテーパ状の環状段部７ｂ
を形成し、この環状段部７ｂに棒状導体１１の係
止部１１ａを当接させるとともに、棒状導体１１
の先端部をキヤツプ金具１０に螺合固定したの
で、万一限流素子１７が劣化あるいは過大雷サー
ジ等により爆発し、碍子本体７が破損しても、キ
ヤツプ金具８と係止部１１ａとの間の碍子本体７
の一部は、両者間に堅持されたままとなり、この
結果電線引留能力を保持でき、従つて電線の地上
落下や断線等が防止できる。 In addition, in the embodiment of the present invention, the cylindrical portion 8a of the cap fitting 8 is extended and fixed to the insulator body 7 with cement 9, and a tapered annular step is provided inside the insulator body 7 at a position corresponding to the cement 9. Part 7b
The locking portion 11a of the rod-shaped conductor 11 is brought into contact with this annular step portion 7b, and the rod-shaped conductor 11
Since the tip of the insulator is screwed and fixed to the cap metal fitting 10, even if the current limiting element 17 deteriorates or explodes due to excessive lightning surge and the insulator body 7 is damaged, the connection between the cap metal fitting 8 and the locking part 11a will be maintained. Insulator body 7 between
A part of the wire remains firmly held between the two, and as a result, the wire anchoring ability can be maintained, and the wire can be prevented from falling to the ground or being disconnected.

考案の効果 以上詳述したように、本考案は万一限流素子が
劣化あるいは過大雷サージ等により爆発し、碍子
本体が破損しても、破損物を飛散させず、碍子本
体の一部は両キヤツプ金具間に堅持されたままと
なり、この結果電線引留能力を保持でき、従つて
電線の地上落下や断線を防止できる効果がある。Effects of the invention As detailed above, the present invention prevents the damaged objects from scattering even if the current limiting element explodes due to deterioration or excessive lightning surge and the insulator body is damaged. The cap remains firmly held between the two cap fittings, and as a result, the wire retaining ability can be maintained, which has the effect of preventing the wire from falling to the ground or breaking.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例を示す半縦断面図、
第２図は第１図のＡ−Ａ線断面図、第３図は耐雷
耐張碍子を組み込んだ耐雷耐張装置を示す正面図
である。 ６……耐雷耐張碍子、７……碍子本体、８，１
０……キヤツプ金具、９……セメント、１１……
棒状導体、１７……限流素子、２０，２２……放
電電極、２１……スペーサ、２３……コイルスプ
リング。 FIG. 1 is a half-longitudinal cross-sectional view showing an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a front view showing a lightning tension device incorporating a lightning tension insulator. 6...Lightning resistant tension insulator, 7...Insulator body, 8,1
0... Cap metal fittings, 9... Cement, 11...
Rod-shaped conductor, 17... current limiting element, 20, 22... discharge electrode, 21... spacer, 23... coil spring.

Claims (1)

【実用新案登録請求の範囲】 １ 筒状の碍子本体７の内壁に環状段部７ｂを形
成し、この碍子本体７には前記環状段部７ｂに
係止される係止部１１ａを有する棒状導体１１
を挿通し、この棒状導体１１を前記碍子本体７
の一端開口部に被冠固定したキヤツプ金具１０
に連結し、碍子本体７の他端開口部にはキヤツ
プ金具８を被冠してその円筒部８ａを前記環状
段部７ｂと対応する位置において固定し、前記
棒状導体１１とキヤツプ金具８の内頂面との間
に限流素子１７、放電電極２０，２２及びスペ
ーサ２１を直列に介在させたことを特徴とする
耐雷耐張碍子。 ２ 前記環状段部７ｂ及び係止部１１ａはテーパ
状に形成されている実用新案登録請求の範囲第
１項記載の耐雷耐張碍子。[Claims for Utility Model Registration] 1. An annular stepped portion 7b is formed on the inner wall of a cylindrical insulator body 7, and the insulator body 7 has a rod-shaped conductor having a locking portion 11a that is locked to the annular stepped portion 7b. 11
is inserted into the insulator body 7, and this rod-shaped conductor 11 is inserted into the insulator body 7.
Cap metal fitting 10 fixed to the opening at one end
The other end opening of the insulator main body 7 is covered with a cap metal fitting 8, and its cylindrical part 8a is fixed at a position corresponding to the annular stepped part 7b. A lightning-resistant tension insulator characterized in that a current limiting element 17, discharge electrodes 20, 22, and a spacer 21 are interposed in series between the top surface and the top surface. 2. The lightning-resistant tension insulator according to claim 1, wherein the annular stepped portion 7b and the locking portion 11a are formed in a tapered shape.