JP3659719B2

JP3659719B2 - Insulator protection device

Info

Publication number: JP3659719B2
Application number: JP32685895A
Authority: JP
Inventors: 憲治武田; 富裕丹下
Original assignee: Nippon Kouatsu Electric Co
Current assignee: Nippon Kouatsu Electric Co
Priority date: 1995-12-15
Filing date: 1995-12-15
Publication date: 2005-06-15
Anticipated expiration: 2015-12-15
Also published as: JPH09167533A

Description

【０００１】
【発明の属する技術分野】
本願発明は高圧配電線路の絶縁電線をその頭部の把持部にバインド線により緊縛して同線を支持するようにした支持碍子に近接或いは装着して使用する碍子保護装置の改良に係り、特に放電開始電圧の安定化と取付作業の効率化を図ることを目的とするものである。
【０００２】
【従来の技術】
絶縁電線を使用した高圧配電線路では、図１０に示すように支持碍子の近傍に碍子保護装置が付設されている。一般に碍子保護装置１００は、腕金１０１に取着した接地側の支持碍子１０２に対し限流素子ユニット１０４と接地側放電電極１０５を本体取付金具１０６により付設し、また充電側となる絶縁電線１０７に対し放電ギヤップｇ₀を介して上記接地側放電電極１０５と対向する充電側放電電極１０８を付設した構成からなり、雷サ−ジ等の過大電圧が絶縁電線１０７を伝搬してくると、上記放電ギヤップｇ₀の絶縁が破壊して同ギヤップｇ₀において閃絡が起こり、雷サ−ジは絶縁電線１０７−充電側放電電極１０８−放電ギヤップｇ₀−接地側放電電極１０５−限流素子ユニット１０４−本体取付金具１０６−腕金１０１−接地線の経路で大地に放電される。そして上記放電経路に介在する上記放電ギヤップｇ₀と限流素子ユニット１０４により続流ア−クが遮断されるため、同ア−クが原因で招来していた支持碍子の偏熱破壊や絶縁電線の断線の発生が未然に防止されるようになっている。
【０００３】
【発明が解決しようとする課題】
ところで、上記にあっては特に充電側である絶縁電線１０７に対し付設した充電側放電電極１０８が絶縁電線１０７の捻回により回転して、その取付位置（取付角度）が変わってしまうと、同電極１０８と接地側放電電極１０５間で形成する放電ギヤップｇ₀のギヤップ長がそれに伴って変化し、放電開始電圧にバラツキが出て不安定になり、保護特性が充分発揮できないことがある。
【０００４】
また、高圧配電線路においては一般用支持碍子と耐塩用支持碍子とが地区別にそれぞれ使用されるが、両碍子は形状（特に高さ）が若干異なるためにこの両方に碍子保護装置を適用する場合には取り付け時に放電ギャップの調整がそれぞれ必要となるが、従来の保護装置にあっては柱上（高所）においてこのギヤップ調整作業が簡単にできず効率が悪かった。
【０００５】
また、従来の保護装置においては充電側放電電極１０８と対向する接地側放電電極１０５の放電部の全体が絶縁電線１０７の直下に位置せず、一部のみがその下側に位置するため絶縁電線が少しでも動いたりすると放電ギヤップ長が変わり、放電開始電圧が不安定となって十分な保護が期待できないことがあった。
【０００６】
【課題を解決しようとするための手段】
本発明は、上記の課題を解決するために、請求項１記載の第１の発明は、支持碍子に限流素子ユニットを本体取付金具で付設し、限流素子ユニットの上部に接地側放電電極を備え、該接地側放電電極を、絶縁電線に付設した充電側放電電極に放電ギャップを介して対向するように付設したものにおいて、
上記充電側放電電極（９）を、その軸心に位置して上方へ突出し絶縁電線（３）の芯線（３ａ）に接触させる針電極（９ａ）と、上記絶縁電線（３）と同心的に配置された円弧状の放電部（９ｂ）とで形成し、
上記充電側放電電極（９）を被覆する絶縁カバー（１０）には、上記針電極（９ａ）から放電させる放電用孔（２０ａ）と、該放電用孔（２０ａ）から上記放電部（９ｂ）の円弧方向への両側に離間した位置において上記放電部（９ｂ）から放電させる放電用孔（１０ｅ）（１０ｆ）を形成したことを特徴とするものである。
【０００７】
本発明においては、絶縁電線（３）が捻回されていない正常な場合には、放電用孔（２０ａ）が接地側放電電極（８）へ指向し、該放電用孔（２０ａ）を通じて、針電極（９ａ）から接地側放電電極（８）へギャップ（Ｇ）を介して放電される。
【０００８】
絶縁電線（３）が仮りに捻回されて回転した場合には、その回転方向と反対側の放電用孔（１０ｅ）又は（１０ｆ）が接地側放電電極（８）へ指向し、この放電用孔（１０ｅ）又は（１０ｆ）を通じて、円弧状の放電部（８ｂ）から接地側放電電極（８）へギャップ（Ｇ）を介して放電される。このとき、円弧状の放電部（８ｂ）の円弧中心が絶縁電線（３）の中心と同心的であるため、絶縁電線（３）とともに放電部（８ｂ）が回転してもその放電部（８ｂ）と接地側放電電極（８）とのギャップ（Ｇ）長はさほど変化せず、上記の非回転状態時とほぼ同等に保持される。
【０００９】
請求項２記載の第２の発明は、上記第１の発明の接地側放電電極（８）を、限流素子ユニットに対して取外し可能に備えるとともに、該接地側放電電極（８）の放電部（８ｂ）の表裏に放電端（８ｇ）（８ｊ）を設け、かつ表側の放電端（８ｇ）を充電側放電電極（９）に対して所定のギャップ（Ｇ）長で対向させた場合と、裏返して裏側の放電端（８ｊ）を充電側放電電極（９）に対して上記と同一のギャップ（Ｇ）長で対向させた場合とで、その接地側放電電極（８）の取付部分が上下に変位するように形成したことを特徴とするものである。
【００１０】
本発明においては、例えば表側の放電端（８ｇ）を上向きにした場合に取付部が上位になり、裏側の放電端（８ｊ）を上向きにした場合に取付部が下位になるように接地側放電電極（８）を形成することにより、図１に示すように、絶縁電線（３）と取付金具（６ｂ）間の距離が短い一般用支持碍子（１）の場合は表側の放電端（８ｇ）を上向きにして使用し、図９に示すように絶縁電線（３）と取付金具（６ｂ）間の距離が長い耐塩用支持碍子（２５）の場合は裏側の放電端（８ｊ）を上向きにして使用する。これにより、上記いずれの場合においても上記ギャップ（Ｇ）長をほぼ同等にすることができる。
【００１１】
請求項３記載の第３の発明は、上記第１又は第２の発明における接地側放電電極（８）を、その平面形状をＬ形に形成するとともに、前記絶縁電線の真下で、かつ、絶縁電線と平行に配置したことを特徴とするものである。
本発明においては、図６（ａ）に示すように接地側放電電極（８）の取付部と放電部（８ｂ）とが相互に変位する。そのため、この接地側放電電極（８）の取付部を支持碍子（１）（２５）の軸心を通る線上に取付けた場合に、支持碍子（１）（２５）に偏心して取付けられた絶縁電線（３）に対して平行でかつ真下に位置して上記放電部（８ｂ）を位置させることができる。
【００１２】
【発明の実施の形態】
以下、図１乃至図９に基づき本願発明の碍子保護装置の実施例について説明する。
【００１３】
１は高圧配電線路の電柱の腕金２に取付固定された一般用支持碍子であり、その頭部の把持部１ａには絶縁電線３がバインド線４により緊縛されている。５は碍子保護装置であり、接地側の腕金２に付設される本体取付金具６、限流素子ユニット７、接地側放電電極８と、また対向して充電側の絶縁電線３に付設される充電側放電電極９、絶縁カバ−１０等から構成されている。
【００１４】
上記限流素子ユニット７は電圧非直線性に優れた酸化亜鉛(ZnO) 等からなる限流素子１１と、ポリアミド樹脂等の合成樹脂性の内筒１２と、ＥＰゴム、ＥＰＤＭゴム等からなるヒダ付き絶縁外被１３等からなり、上方にボルト形の上部端子１４を突設し、下方に下部端子１５が突設している。上記下部端子１５は本体取付金具６の支持部６ａの取付穴に上方より差し込まれた状態で下方よりナット２８およびワッシャ−１８によりネジ着されている。
【００１５】
つまり、限流素子ユニット７はその下部端子１５によって本体取付金具６に対し電気的並びに機械的に接続されている。
接地側放電電極８は上部端子１４に対し後端８ｃ側が回動不能にナット１７によりネジ着されており、更にその側断面形状が図４及び図５に示すように逆凹形に形成されているとともにその平面形状が図６に示すように略Ｌ形に形成されている。すなわち、接地側放電電極８を図６に示すように取付部８ａと放電部８ｂとに分割して形成し、その取付部８ａをＬ形に形成し、放電部８ｂを直線状に形成し、これらをビス１６で連結して、全体をＬ形にしている。このようにＬ形に形成することにより、支持碍子１の中心に対して絶縁電線３が偏心して架設された状態において、放電部８ｂを絶縁電線３の直下で平行して配置することができる。
【００１６】
更に該接地側放電電極８はステンレス板或いは黄銅板を逆凹形に曲げて高い曲げ強度を有し、かつ、同電極８はその途中で取付部８ａと放電部８ｂとに２分割され、これらをビス１６により分離可能に連結して構成されている。
【００１７】
更に、放電部８ｂは後端（ビス１６によるネジ着）側の水平部から途中８ｄを若干下向きに屈曲した後、再び絶縁電線３に対し平行（水平）となるように先端側８ｆを延出形成している。更に該延出したその先端側８ｆには図６（ａ）（ｂ）に示すように、観音扉状に上方へ打ち抜き形成した２枚の放電突起８ｇ，８ｇが先端側８ｆの延出方向に平行し、かつ正面からみて帯状に形成されている。
【００１８】
なお、本実施例では放電突起８ｇがある面を表８ｈ、その反対面を裏８ｉと称しており、放電突起（放電端）８ｇが設けられた放電部８ｂはその放電部の全体を碍子保護装置５の取り付け時、絶縁電線３に対し平行でかつ直下に位置させることで正規の放電ギヤップ長が確保できるようになっている。
【００１９】
６は限流素子ユニット５等を支持碍子１のベ−ス金具１ｂに取付接続するためのバンド状の本体取付金具であり、前方に突出する支持部６ａには、上部端子１４に接地側放電電極８を備えた限流素子ユニット７が直立状態で下部端子１５により取付接続される。また、本体取付金具６の挟持部６ｂは支持碍子１のベ−ス金具１ｂをその外周面側から挟持し、取付ボルト２９、座金付きナット１９により取り付けるようになっている。６ｃは取付ボルト２９の取付並びに取り外しをし易くするための切欠されたガイド溝である。６ｄは本体取付金具６の回転防止と同時に位置決めを行う下方突片であり、挟持部６ｂと支持部６ａの境界付近の本体取付金具６に形成され、同金具６を支持碍子１のベ−ス金具１ｂに挟持した状態で取り付けた場合にその下方突片６ｄが腕金２の側面２ａに対し係止するようになっている。
【００２０】
９は充電側である絶縁電線３側に付設された充電側放電電極であり、同電極９は上記接地側放電電極８との間で所定の放電ギヤップ長（標準放電ギヤップ長：３５ｍｍ〜４５ｍｍ）を形成するために取り付けられるもので、図７に示すように金属線からなるバインド線４が絶縁電線３の芯線と電気的に接続されて充電部とならないようにバインド線４の存在しない部分例えばａに位置して取り付けられる。
【００２１】
該充電側放電電極９は図７及び図８に示すように、中央に位置するステンレス或いは黄銅製の針電極９ａと、その針電極９ａを中心にして絶縁電線３と同心的な位置関係になるように円弧状に形成した同じくステンレス板或いは黄銅板から作られた放電部９ｂとからなる。また針電極９ａはＥＶＡ（エチレンビニールアルコール）樹脂等からなるネジ部材２０の中央上部に突出的に固着され、針電極９ａの下部に一体形成した放電端９ａ′がネジ部材２０に形成した小孔の放電用孔２０ａを覗見するようにして設けられている。そして上記ネジ部材２０には六角頭２０ｂが一体成形されており、該ネジ部材２０を絶縁カバ−１０のネジ部１０ａに螺回して挿着すると針先端部９ａ₁が絶縁電線３の被覆３ｂを突き破って芯線３ａと接触するようになっている。なお、針電極９ａは放電部９ｂに対し空回りの関係になっており、ネジ部材２０の螺回操作により同部材２０と共に針電極９ａのみが上下方向に進退するようになっている。
【００２２】
上記絶縁カバー１０は耐候性等に優れたＥＶＡ（エチレンビニ−ルアルコ−ル）樹脂等で形成されており、そのネジ部１０ａの軸心は上記芯線３ａの軸心とほぼ交わるように設定されている。更に同カバー１０は充電側放電電極９を絶縁電線３に付設する場合の取付主体となるもので、絶縁スペ−サ−２１、２２を介して絶縁電線３に取り付けられている。
【００２３】
上記カバー１０は上下に２分割して形成されており、図３に示すように、夫々の一側をヒンジ１０ｄで開閉可能に連結され、夫々の他側に接合部１０ｃ，１０ｃが突出形成されている。そして、該カバー１０の取付けに際しては、両分割片を絶縁電線３を挟むように閉じてその重合された両接合部１０ｃ，１０ｃに樹脂製の止着ネジ２４によりネジ着する。
【００２４】
２５は針電極により突き破られた穴から雨水等が浸水して絶縁電線３の芯線３ａが応力腐食割れすることを防止する小片の融着部材、例えばパテテ−プ等からなるシ−ル材であり、針電極９ａに添着されている。
【００２５】
１０ｅ，１０ｆはネジ部材２０の放電用孔２０ａを中心にその両隣に設けた小孔からなる放電用孔であり、該両放電用孔１０ｅと放電用孔１０ｆとがなす芯線３ａを中心とする角度は所望に設定されるもので、望ましくはほぼ９０度前後にするとよい。
【００２６】
つまり、絶縁電線が捻回などにより右或いは左に回転した場合にこの放電用孔１０ｅ，１０ｆを通じて放電し、この回転時にも充電側接地電極９と接地側接地電極８との放電ギヤップＧのギヤップ長が差ほど変わらない（規定ギヤップ長の範囲内にある）ように工夫したもので、放電用孔１０ｅ、１０ｆの奥には円弧状の上記放電部９ｂが位置するようになっている。
【００２７】
図９は耐塩用支持碍子２５に対し本願発明の碍子保護装置５を取り付けた場合の実施例を示すものであり、図１の一般用支持碍子１の取付の場合と比較して、限流素子ユニット７の上部端子１４に取り付けた接地側放電電極８の放電部８ｂを裏向きにして使用したことが相違している。つまり、ビス１６を外して放電突起８ｇが下方向きになるように放電部８ｂを裏返し、再度ビス１６で締め付け直すことにより、一般用支持碍子１より縦方向（高さ）の長い耐塩用支持碍子２５に対し、その縦方向（高さ）の差がこれにより調整（補正）されて、接地側放電電極８と充電側放電電極９間で設定する放電ギヤップＧが正規の長さ（標準ギヤップ長：３５ｍｍ〜４５ｍｍ）になり、所定の放電開始電圧が得られることになる。なお、放電部８ｂにはその上向きになった裏８ｉに放電突起が特に設けられていないが逆凹状の放電部８ｂの上向きになった両端の突部８ｊを放電突起（放電端）として代用するようにしている。
【００２８】
２６は腕金２の寸法７５ｍｍ角、４５ｍｍ×７５ｍｍ角に対応して本体取付金具６の取付を調整するようにした同金具６に止着した樹脂部材からなる着脱自在なアダプタ−であり、例えば７５ｍｍ角の腕金２への取付の場合には同アダプタ−２６を取り除いた状態で本体取付金具６を使用する。
【００２９】
上記構成の碍子保護装置５は雷サ−ジの伝搬があると次のように動作する。
今、雷サ−ジが絶縁電線３を伝搬してきてその電圧が碍子保護装置５の放電開始電圧以上であると、その過電圧が放電ギヤップＧ間に印加され、同ギヤップＧにおいて閃絡が生じる。閃絡すると雷サ−ジは、絶縁電線３−充電側放電電極９−放電ギヤップＧ−接地側放電電極８−上部端子１４−限流素子ユニット７−下部端子１５−本体取付金具６−腕金２の放電経路で大地に放電される。またこの際、放電経路には放電ギヤップＧと限流素子ユニット７があるため続流ア−クは遮断されて発生せず、したがって支持碍子１、２５はア−クによる偏熱破壊から防止され、また絶縁電線３はその溶損による断線が防止されることになる。
【００３０】
【発明の効果】
以上のようであるから、請求項１記載の発明によれば、
絶縁電線側に付設した充電部側放電電極は同電線に対し同心的になるように円弧状に配置されているため、仮に絶縁電線が捻回などにより回転してもこれと対向する接地側放電電極との距離、つまり放電ギヤップのギヤップ長が一定範囲内に収まって差程変化しないため、放電開始電圧が安定し、保護特性が一段と確実なものとなる。
【００３１】
請求項２記載の発明によれば、更に、
一般用支持碍子と耐塩用支持碍子の形状（高さ）の違ったそれぞれの支持碍子に対しても、接地側放電電極の表裏の交換取付けだけで所定の放電ギヤップが設定できるため柱上等でも簡単に作業ができ作業効率の向上につながる。
【００３２】
請求項３記載の発明によれば、更に、
限流素子ユニットの上部端子に接続する接地側放電電極の形状を平面Ｌ形に形成して同装置の支持碍子への取り付け時に絶縁電線と平行でかつ真下に位置するようにしたため同電極と放電ギヤップを介して対向する絶縁電線の充電側放電電極との間、つまり放電ギヤップ長が正しく設定できるため放電特性の安定化につながる。
【図面の簡単な説明】
【図１】本願発明の実施例を示すもので、一般用支持碍子に対し本願発明の碍子保護装置を取り付けた場合の取付状態図。
【図２】図１の底面図。
【図３】充電側放電電極の取付状態を示す側面図。
【図４】接地側電極の取付状態を示す側面図。
【図５】接地側放電電極の取付状態を示す背面図。
【図６】（ａ）は限流素子ユニットの上部端子と接地側放電電極の取付状態を示す平面図、（ｂ）は（ａ）におけるＡ−Ａ線断面図。
【図７】充電側放電電極並びに絶縁カバ−の絶縁電線への取付状態を示す断面図。
【図８】図７におけるＢ−Ｂ線断面図。
【図９】耐塩用支持碍子に対し本願発明の碍子保護装置を取り付けた場合の取付状態図。
【図１０】従来例の取付状態図。
【符号の説明】
３絶縁電線
５碍子保護装置
７限流素子ユニット
９充電側放電電極
９ａ針電極
９ｂ放電部
８接地側放電電極
８ｂ放電部
８ｇ，８ｊ放電端
１０絶縁カバ−
１０ｅ放電用孔
１０ｆ放電用孔
２０ａ放電用孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an insulator protection device that is used in the vicinity of or attached to a support insulator that is used to support the same wire by binding an insulated wire of a high-voltage distribution line to a grip portion of its head with a bind wire. The purpose is to stabilize the discharge start voltage and improve the efficiency of the mounting work.
[0002]
[Prior art]
In a high voltage distribution line using an insulated wire, an insulator protection device is attached in the vicinity of the support insulator as shown in FIG. In general, the insulator protection device 100 includes a current-limiting element unit 104 and a ground-side discharge electrode 105 attached to a ground-side support insulator 102 attached to a metal arm 101 by a main body mounting bracket 106, and an insulated wire 107 on the charging side. On the other hand, a charging-side discharge electrode 108 facing the ground-side discharge electrode 105 is provided via a discharge gap g _{0. When} an excessive voltage such as a lightning surge propagates through the insulated wire 107, discharge Giyappu g insulation ₀ flashovers in the Giyappu g ₀ destroyed, Kaminarisa - di is an insulated wire 107 and the charge side discharge electrodes 108- discharge Giyappu g ₀ - ground discharge electrodes 105 and current limiting element unit It is discharged to the ground through a route of 104-main body mounting bracket 106-arm metal 101-ground line. Then the discharge Giyappu g ₀ and the current limit element unit 104 by the follow current A interposed the discharge path - for click is blocked, the A - temperature deviation destruction or insulated wire supporting insulators click had Shorai due The occurrence of disconnection is prevented in advance.
[0003]
[Problems to be solved by the invention]
By the way, especially in the above, when the charging side discharge electrode 108 attached to the insulated wire 107 on the charging side is rotated by twisting of the insulated wire 107 and its mounting position (mounting angle) is changed, Giyappu length of the discharge Giyappu g ₀ where the electrode 108 is formed between the ground side discharge electrode 105 is changed in accordance therewith, unstable out variations in discharge starting voltage, protective properties may not be sufficiently exhibited.
[0004]
Also, in the high-voltage distribution line, general support insulators and salt-resistant support insulators are used for each area, but both insulators have slightly different shapes (especially height), so the insulator protection device is applied to both. However, it is necessary to adjust the discharge gap at the time of installation. However, in the conventional protective device, this gap adjustment work cannot be easily performed on the pillar (high place), and the efficiency is poor.
[0005]
Further, in the conventional protection device, the entire discharge part of the ground-side discharge electrode 105 facing the charge-side discharge electrode 108 is not located directly below the insulated wire 107, but only a part is located below the insulated wire 107, so that the insulated wire If the gas moves even a little, the discharge gap length changes, the discharge start voltage becomes unstable, and sufficient protection may not be expected.
[0006]
[Means for solving problems]
In order to solve the above-mentioned problems, the present invention provides a first invention according to claim 1, wherein a current limiting element unit is attached to a support insulator with a body mounting bracket, and a ground-side discharge electrode is provided above the current limiting element unit. The ground side discharge electrode is attached so as to face the charge side discharge electrode attached to the insulated wire via the discharge gap.
The charge-side discharge electrode (9) is positioned concentrically with the insulated wire (3), and the needle electrode (9a) that projects upward and contacts the core wire (3a) of the insulated wire (3). Formed with the arc-shaped discharge part (9b) arranged,
The insulating cover (10) covering the charging-side discharge electrode (9) includes a discharge hole (20a) for discharging from the needle electrode (9a), and the discharge portion (9b) from the discharge hole (20a). The discharge holes (10e) and (10f) for discharging from the discharge part (9b) are formed at positions separated on both sides in the arc direction.
[0007]
In the present invention, when the insulated wire (3) is not twisted, the discharge hole (20a) is directed to the ground-side discharge electrode (8), and the needle is passed through the discharge hole (20a). The electrode (9a) is discharged through the gap (G) from the ground side discharge electrode (8).
[0008]
When the insulated wire (3) is twisted and rotated, the discharge hole (10e) or (10f) on the opposite side to the rotation direction is directed to the ground-side discharge electrode (8), and this discharge It discharges through a hole (10e) or (10f) from a circular arc shaped discharge part (8b) to a ground side discharge electrode (8) through a gap (G). At this time, since the arc center of the arc-shaped discharge portion (8b) is concentric with the center of the insulated wire (3), even if the discharge portion (8b) rotates together with the insulated wire (3), the discharge portion (8b) ) And the ground-side discharge electrode (8) does not change so much, and is maintained substantially equal to that in the non-rotating state.
[0009]
According to a second aspect of the present invention, the ground-side discharge electrode (8) according to the first aspect of the present invention is detachable from the current limiting element unit, and the discharge portion of the ground-side discharge electrode (8) is provided. The discharge end (8g) (8j) is provided on the front and back of (8b), and the front discharge end (8g) is opposed to the charge side discharge electrode (9) with a predetermined gap (G) length; When the reverse side discharge end (8j) is opposed to the charge side discharge electrode (9) with the same gap (G) length as above, the mounting portion of the ground side discharge electrode (8) is It is characterized by being formed so as to be displaced.
[0010]
In the present invention, for example, when the front discharge end (8g) is directed upward, the mounting portion is higher, and when the rear discharge end (8j) is upward, the ground side discharge is performed so that the mounting portion is lower. By forming the electrode (8), as shown in FIG. 1, in the case of the general support insulator (1) where the distance between the insulated wire (3) and the mounting bracket (6b) is short, the discharge end (8g) on the front side In the case of the salt-resistant support insulator (25) having a long distance between the insulated wire (3) and the mounting bracket (6b) as shown in FIG. 9, the discharge end (8j) on the back side faces upward. use. Thereby, the gap (G) length can be made substantially equal in any of the above cases.
[0011]
A third invention is according to claim 3, the ground side discharge electrode (8) in the first or second aspect of the invention, to form a planar shape of that the L-shaped, just below the insulated wire, and, It arrange | positions in parallel with the insulated wire, It is characterized by the above-mentioned.
In the present invention, as shown in FIG. 6A, the mounting portion of the ground-side discharge electrode (8) and the discharge portion (8b) are displaced from each other. Therefore, when the attachment portion of the ground side discharge electrode (8) is attached on a line passing through the axis of the support insulator (1) (25), the insulated wire attached eccentrically to the support insulator (1) (25). The discharge part (8b) can be positioned parallel to (3) and directly below.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the insulator protecting device according to the present invention will be described with reference to FIGS.
[0013]
Reference numeral 1 denotes a general support insulator attached and fixed to a brace 2 of a power pole of a high-voltage distribution line. An insulated wire 3 is bound to a grip portion 1 a of the head by a bind wire 4. Reference numeral 5 denotes an insulator protection device, which is attached to the main body mounting bracket 6 attached to the ground-side arm 2, the current-limiting element unit 7, the ground-side discharge electrode 8, and the charging-side insulated wire 3 so as to face each other. The charging side discharge electrode 9 and the insulating cover 10 are included.
[0014]
The current limiting element unit 7 includes a current limiting element 11 made of zinc oxide (ZnO) or the like excellent in voltage non-linearity, a synthetic resin inner cylinder 12 such as polyamide resin, and a pleat made of EP rubber, EPDM rubber or the like. A bolt-shaped upper terminal 14 protrudes upward and a lower terminal 15 protrudes downward. The lower terminal 15 is screwed by a nut 28 and a washer 18 from below while being inserted into the mounting hole of the support portion 6a of the main body mounting bracket 6 from above.
[0015]
That is, the current limiting element unit 7 is electrically and mechanically connected to the body mounting bracket 6 by the lower terminal 15.
The ground side discharge electrode 8 is screwed to the upper terminal 14 at the rear end 8c side by a nut 17 so as not to rotate, and the side sectional shape thereof is formed in a reverse concave shape as shown in FIGS. As shown in FIG. 6, the planar shape is substantially L-shaped. That is, as shown in FIG. 6, the ground side discharge electrode 8 is divided into a mounting portion 8a and a discharge portion 8b, the mounting portion 8a is formed in an L shape, and the discharge portion 8b is formed in a straight line. These are connected with screws 16 to form an L shape as a whole. By forming the L-shape in this way, the discharge portion 8b can be arranged in parallel directly under the insulated wire 3 in a state where the insulated wire 3 is eccentrically installed with respect to the center of the support insulator 1.
[0016]
Further, the ground-side discharge electrode 8 has a high bending strength by bending a stainless steel plate or a brass plate into an inverted concave shape, and the electrode 8 is divided into two parts, an attachment part 8a and a discharge part 8b. Are detachably connected by screws 16.
[0017]
Further, the discharge part 8b bends the middle part 8d slightly downward from the horizontal part on the rear end (screwed by screws 16) side, and then extends the front end side 8f so as to be parallel (horizontal) to the insulated wire 3 again. Forming. Further, as shown in FIGS. 6 (a) and 6 (b), two discharge protrusions 8g, 8g formed by punching upward in the shape of a door are formed on the extended distal end side 8f in the extending direction of the distal end side 8f. They are parallel and formed in a band shape when viewed from the front.
[0018]
In this embodiment, the surface with the discharge protrusion 8g is referred to as the front 8h, and the opposite surface is referred to as the back 8i. The discharge portion 8b provided with the discharge protrusion (discharge end) 8g protects the entire discharge portion with insulator protection. When the device 5 is mounted, a normal discharge gap length can be secured by being positioned parallel to and immediately below the insulated wire 3.
[0019]
Reference numeral 6 denotes a band-shaped main body mounting bracket for mounting and connecting the current limiting element unit 5 and the like to the base metal fitting 1b of the support insulator 1. The support portion 6a protruding forward is connected to the upper terminal 14 by the ground side discharge. The current limiting element unit 7 including the electrode 8 is attached and connected by the lower terminal 15 in an upright state. The clamping portion 6b of the main body mounting bracket 6 clamps the base metal fitting 1b of the supporting insulator 1 from the outer peripheral surface side and attaches it with the mounting bolt 29 and the nut 19 with a washer. Reference numeral 6c denotes a notched guide groove for facilitating attachment and removal of the attachment bolt 29. 6d is a downward projecting piece for positioning at the same time as preventing the rotation of the main body mounting bracket 6 and is formed on the main body mounting bracket 6 in the vicinity of the boundary between the sandwiching portion 6b and the support portion 6a. When attached in a state of being clamped by the metal fitting 1b, the lower protruding piece 6d is locked to the side surface 2a of the arm metal 2.
[0020]
9 is a charge-side discharge electrode provided on the insulated wire 3 side, which is the charge side, and the electrode 9 has a predetermined discharge gap length between the ground-side discharge electrode 8 (standard discharge gap length: 35 mm to 45 mm). 7 is a portion where the bind wire 4 is not present so that the bind wire 4 made of a metal wire is not electrically connected to the core wire of the insulated wire 3 to become a charging part as shown in FIG. Mounted at a.
[0021]
As shown in FIGS. 7 and 8, the charging-side discharge electrode 9 has a needle electrode 9a made of stainless steel or brass located in the center, and has a concentric positional relationship with the insulated wire 3 around the needle electrode 9a. Similarly, the discharge portion 9b made of a stainless steel plate or a brass plate is formed in an arc shape. The needle electrode 9a is projectably fixed to the upper center of a screw member 20 made of EVA (ethylene vinyl alcohol) resin or the like, and a discharge end 9a 'formed integrally with the lower portion of the needle electrode 9a is a small hole formed in the screw member 20. The discharge hole 20a is provided so as to look into it. The screw member 20 is integrally formed with a hexagon head 20b. When the screw member 20 is screwed into the screw portion 10a of the insulating cover 10 and inserted, the needle tip 9a ₁ covers the sheath 3b of the insulated wire 3. It breaks through and comes into contact with the core wire 3a. The needle electrode 9a is in an idle relationship with respect to the discharge portion 9b, and only the needle electrode 9a is advanced and retracted together with the member 20 by the screwing operation of the screw member 20.
[0022]
The insulating cover 10 is formed of EVA (ethylene vinyl alcohol) resin or the like having excellent weather resistance, and the axial center of the screw portion 10a is set so as to substantially intersect the axial center of the core wire 3a. . Further, the cover 10 is an attachment main body when the charging-side discharge electrode 9 is attached to the insulated wire 3, and is attached to the insulated wire 3 via insulating spacers 21 and 22.
[0023]
As shown in FIG. 3, the cover 10 is divided into two parts in the vertical direction, and one side of each of the covers 10 is connected by a hinge 10d so that the cover 10 can be opened and closed, and joints 10c and 10c are formed to protrude on the other side. ing. When the cover 10 is attached, both the divided pieces are closed so as to sandwich the insulated wire 3 and are screwed to the superposed joint portions 10c, 10c with resin fixing screws 24.
[0024]
Reference numeral 25 denotes a seal material made of a small piece of a fusion member, for example, a pate tape, which prevents rainwater or the like from entering through a hole pierced by the needle electrode to prevent the core wire 3a of the insulated wire 3 from undergoing stress corrosion cracking. Yes, it is attached to the needle electrode 9a.
[0025]
10e and 10f are discharge holes composed of small holes provided on both sides of the discharge hole 20a of the screw member 20, and the core wire 3a formed by the discharge holes 10e and the discharge hole 10f is the center. The angle is set as desired, and is preferably about 90 degrees.
[0026]
That is, when the insulated wire rotates to the right or left due to twisting or the like, the discharge holes 10e and 10f are discharged, and the gap of the discharge gap G between the charging side ground electrode 9 and the ground side ground electrode 8 is also rotated during this rotation. It is devised so that the length does not change as much as the difference (within the specified gap length range), and the arc-shaped discharge part 9b is located in the back of the discharge holes 10e, 10f.
[0027]
FIG. 9 shows an embodiment in which the insulator protection device 5 of the present invention is attached to the salt-resistant support insulator 25. Compared with the case of attaching the general support insulator 1 of FIG. The difference is that the discharge part 8b of the ground-side discharge electrode 8 attached to the upper terminal 14 of the unit 7 is used face down. That is, by removing the screw 16 and turning the discharge portion 8b upside down so that the discharge protrusion 8g faces downward and retightening with the screw 16, the salt-resistant support insulator is longer in the vertical direction (height) than the general support insulator 1. 25, the difference in the vertical direction (height) is adjusted (corrected) thereby, and the discharge gap G set between the ground-side discharge electrode 8 and the charge-side discharge electrode 9 is set to a regular length (standard gap-up length). : 35 mm to 45 mm), and a predetermined discharge start voltage is obtained. The discharge portion 8b is not provided with discharge protrusions on the back surface 8i facing upward, but the protrusions 8j at both ends facing upwards of the reverse concave discharge portion 8b are used as discharge protrusions (discharge ends). Like that.
[0028]
26 is a detachable adapter made of a resin member fixed to the metal fitting 6 that adjusts the attachment of the main body attachment metal fitting 6 corresponding to the dimensions of the arm metal 2 of 75 mm square and 45 mm × 75 mm square. In the case of attachment to a 75 mm square arm metal 2, the main body attachment bracket 6 is used with the adapter 26 removed.
[0029]
The insulator protection device 5 configured as described above operates as follows when lightning surge is propagated.
If the lightning surge propagates through the insulated wire 3 and its voltage is equal to or higher than the discharge start voltage of the insulator protection device 5, the overvoltage is applied between the discharge gaps G, and a flashing occurs at the same gap G. When flashed, the lightning surges are: insulated wire 3 -charge side discharge electrode 9 -discharge gap G -ground side discharge electrode 8 -upper terminal 14 -current limiting element unit 7 -lower terminal 15 -main body mounting bracket 6 -arm bracket It is discharged to the ground by two discharge paths. At this time, since the discharge gap G and the current limiting element unit 7 are present in the discharge path, the continuation arc is interrupted and does not occur. Therefore, the support insulators 1 and 25 are prevented from the thermal destruction due to the arc. In addition, the insulated wire 3 is prevented from being disconnected due to melting damage.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention,
Since the charging part side discharge electrode provided on the insulated wire side is arranged in an arc shape so as to be concentric with the same wire, even if the insulated wire is rotated by twisting or the like, the ground side discharge is opposed to this Since the distance from the electrode, that is, the gap length of the discharge gap is within a certain range and does not change so much, the discharge start voltage is stabilized and the protection characteristics are further ensured.
[0031]
According to the invention described in claim 2, further,
Even for support insulators with different shapes (heights) of general support insulators and salt-resistant support insulators, a predetermined discharge gap can be set simply by replacing the front and back of the ground side discharge electrode. It is easy to work and leads to improved work efficiency.
[0032]
According to the invention of claim 3, further,
The shape of the ground side discharge electrode connected to the upper terminal of the current limiting element unit is formed in a plane L shape so that it is parallel to the insulated wire and positioned directly underneath when mounted on the support insulator of the device. Between the charge-side discharge electrodes of the insulated wires facing each other via the gap, that is, the discharge gap length can be set correctly, leading to stabilization of the discharge characteristics.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is an attachment state diagram when the insulator protection device of the present invention is attached to a general support insulator.
FIG. 2 is a bottom view of FIG.
FIG. 3 is a side view showing a mounting state of a charge side discharge electrode.
FIG. 4 is a side view showing a mounting state of a ground side electrode.
FIG. 5 is a rear view showing a mounting state of the ground-side discharge electrode.
6A is a plan view showing an attachment state of an upper terminal of a current limiting element unit and a ground side discharge electrode, and FIG. 6B is a cross-sectional view taken along line AA in FIG.
FIG. 7 is a cross-sectional view showing a state in which a charging-side discharge electrode and an insulating cover are attached to an insulated wire.
8 is a cross-sectional view taken along line BB in FIG.
FIG. 9 is an attachment state diagram when the insulator protection device of the present invention is attached to the salt-resistant support insulator.
FIG. 10 is a mounting state diagram of a conventional example.
[Explanation of symbols]
3 Insulated Wire 5 Insulator Protection Device 7 Current Limiting Element Unit 9 Charging Side Discharge Electrode 9a Needle Electrode 9b Discharge Part 8 Ground Side Discharge Electrode 8b Discharge Part 8g, 8j Discharge End 10 Insulation Cover
10e Discharge hole 10f Discharge hole 20a Discharge hole

Claims

A current-limiting element unit is attached to the support insulator with a body mounting bracket, and a ground-side discharge electrode is provided above the current-limiting element unit. The ground-side discharge electrode is connected to the charge-side discharge electrode attached to the insulated wire via a discharge gap. Are attached to face each other,
The charge-side discharge electrode (9) is positioned concentrically with the insulated wire (3), and the needle electrode (9a) that projects upward and contacts the core wire (3a) of the insulated wire (3). Formed with the arc-shaped discharge part (9b) arranged,
The insulating cover (10) covering the charging-side discharge electrode (9) includes a discharge hole (20a) for discharging from the needle electrode (9a), and the discharge portion (9b) from the discharge hole (20a). The insulator protecting device is characterized in that discharge holes (10e) and (10f) for discharging from the discharge part (9b) are formed at positions separated on both sides in the arc direction.

The ground-side discharge electrode (8) according to claim 1 is provided so as to be removable from the current-limiting element unit, and the discharge terminals (8g) ( 8j) and the front discharge end (8g) is opposed to the charge discharge electrode (9) with a predetermined gap (G) length, and the reverse discharge end (8j) is turned to the charge side The mounting portion of the ground-side discharge electrode (8) is formed so as to be displaced up and down when facing the discharge electrode (9) with the same gap (G) length as described above. Insulator protection device.

The ground side discharge electrode according to claim 1 or 2, wherein (8), to form a planar shape of that the L-shaped, just below the insulated wire, and characterized by being arranged parallel to the insulated wire insulator Protective device.