JP3659722B2

JP3659722B2 - Insulator device with built-in protection device

Info

Publication number: JP3659722B2
Application number: JP00347196A
Authority: JP
Inventors: 良作中田; 憲治武田; 富裕丹下
Original assignee: Nippon Kouatsu Electric Co
Current assignee: Nippon Kouatsu Electric Co
Priority date: 1996-01-12
Filing date: 1996-01-12
Publication date: 2005-06-15
Anticipated expiration: 2016-01-12
Also published as: JPH09198945A

Description

【０００１】
【発明の属する技術分野】
本願発明は保護装置内蔵形碍子装置の改良に係り、閃絡時における続流ア−クによる碍子の偏熱破壊や絶縁電線の溶断事故等を確実に防止でき、また全体構造がコンパクトな保護装置内蔵形碍子装置に関するものである。
【０００２】
【従来の技術】
近年、高圧配電線路においては絶縁電線を支持する碍子装置に対し避雷機能を有する保護装置が備えられている。この保護装置の種類にはア−クホ−ンに限流素子を配した所謂、限流ア−クホ−ンタイプや、限流素子を本体碍子に内蔵した碍子内蔵タイプや或いは限流素子ユニットとして前以て組み付けこれを碍子体に取り付けるようにした碍子外付けタイプ等がある。
【０００３】
そして、これらの保護装置は、高圧配電線路の何処かで落雷が発生して、雷サ−ジ等の異常高電圧が配電線（絶縁電線）を伝搬し、侵入して来た場合に絶縁的に弱点部である碍子装置に備えた保護装置を介して同サ−ジを速やかに大地に逃がし、其の際に保護装置の限流素子により閃絡に伴う続流ア−クを遮断するようにしたもので、続流ア−クの発生に伴う碍子体の偏熱破壊や絶縁電線の溶断事故を未然に防止しようとするものである。
【０００４】
【発明が解決しようとする課題】
ところで、上記従来の保護装置にあっては長期使用により限流素子が劣化したり或いは性能を越える雷サ−ジの侵入があると限流素子が閃絡（短絡）事故を起こして破壊したりすることがあるが、かかる場合、限流素子の破壊だけに止まらず本体碍子（絶縁容器）までが損傷を受け使用停止や機能停止等を招いたりする等の問題がある。
【０００５】
また、保護装置を取付けるタイプにあっては、碍子装置全体の大型化や重量増大化が避けられないと言う問題がある。また従来の外部放電ギヤップタイプの場合は周囲の影響を大きく受け易いため放電開始電圧がバラついて放電特性が安定せず十分な保護特性が発揮できなかったりする等、動作上の問題もある。
【０００６】
また、特に限流ア−クホ−ンタイプの場合は放電開始電圧がバラつくことはもとより側方に大きく飛び出した状態で取り付けられるため装柱上、美観上、絶縁上等でも問題がある。
【０００７】
【課題を解決するための手段】
本願発明は上記諸々の問題を解決するためのもので、
本願の第１の発明は、体内に上下に貫通する空間部（２ｂ）を形成した碍子体（２）と、
上記碍子体（２）の下部に固着するとともに腕金（４０）に取付けられるベース金具（２０）と、
碍子体（２）の頭部（２ａ）に固着され、かつ、碍子体（２）の頭部（２ａ）の上部に収納部（３ａ）を設けて該収納部（３ａ）を碍子体（２）の外部に設け、更に絶縁電線（７）に電気的に接続されたキヤップ金具（３）と、
前記収納部（３ａ）と前記碍子体（２）の頭部（２ａ）との間に設けた仕切板（８）と、
上記キヤップ金具（３）の収納部（３ａ）内に収納され、かつ上記キヤップ金具（３）に電気的に接続された限流素子（９）と、一端が上記限流素子（９）に接続され他端の放電部（１３）が上記空間部（２ｂ）を貫通して上記ベース金具（２０）内に突出した導出用電極（１２）と、上記放電部（１３）付近を除く導出用電極（１２）の外面及び上記限流素子（９）の外面を被覆する絶縁部材（１６）とからなる限流素子ユニット（１０）と、
前記導出用電極（１２）の外面を被覆する絶縁材料（１６）に、前記空間部（２ｂ）を形成する内周面（２ｄ）に当接するように形成したガイド部（１６ｂ）と、
上記ベース金具（２０）と上記放電部（１３）とを所定の隙間で電気的に接続する放電ギヤップ（Ｇ）と、
からなるものである。
【０００８】
また、本願の第２の発明は、体内に上下に貫通する空間部（２ｂ）を形成した碍子体（２）と、
上記碍子体（２）の下部に固着され、かつ、碍子体（２）の下部に収納部（２０ａ）を設けて該収納部（２０ａ）を碍子体（２）の外部に設け、更に腕金（４０）に取付けられるベース金具（２０）と、
前記収納部（２０ａ）と前記碍子体の下部との間に設けた仕切板（２５）と、
碍子体（２）の頭部に固着され、かつ絶縁電線（７）に電気的に接続されたキヤップ金具（３）と、
上記キヤップ金具（３）に電気的に接続して固設され、かつ内圧により離脱する封着部材（３１）と、
上記ベース金具（２０）の収納部（２０ａ）内に収納され、かつベース金具（２０）に電気的に接続された限流素子（９）と、一端が上記限流素子（９）に接続され他端の放電部（１３）が上記空間部（２ｂ）を貫通して上記キヤップ金具（３）部に突出した導出用電極（１２）と、上記放電部（１３）付近を除く導出用電極（１２）の外面及び上記限流素子（９）の外面を被覆する絶縁部材（１６）とからなる限流素子ユニット（１０）と、
前記導出用電極（１２）の外面を被覆する絶縁材料（１６）に、前記空間部（２ｂ）を形成する内周面（２ｄ）に当接するように形成したガイド部（１６ｂ）と、
上記キヤップ金具（３）に固着した封着部材（３１）と上記放電部（１３）とを所定の隙間で電気的に接続する放電ギヤップ（Ｇ）と、
からなることを特徴とするものである。
【０００９】
また、本願の第３の発明は、上記第１の発明におけるベース金具（２０）に側方への放圧口（２０ｅ）を形成し、ベース金具（２０）の側部には、上記放圧口（２０ｅ）より放圧されたアークをキヤップ金具（３）側に向かって放圧するアーク移行金具（２７）を設けたものである。
【００１０】
また本願の第４の発明は、上記第２の発明における封着部材（３１）の上部に、該封着部材（３１）の離脱により放圧されたアークをベース金具（２０）側に向かって放圧するアーク移行金具（３３）を設けたものである。
【００１１】
【発明の実施の形態】
以下、図の実施例に基づいて本発明の実施の形態について説明する。
図１は第１実施例である。
【００１２】
１は保護装置内蔵形の碍子装置であり、その深溝形碍子からなる碍子体２の頭部２ａには鉄、ステンレス鋼鈑等からなるキヤップ金具３がセメント系或いは合成樹脂系の接着材４により固着されている。該キヤップ３の内部には収納部３ａが形成され、該収納部３ａによる空間が頭部２ａの上部に形成されるようにキヤップ３が固設されている。６はキヤップ金具３の上部外面３ｂに溶接等により固設したりまたはキヤップ金具と一体的に組付形成したクランプ部である。該クランプ部６は第１の電線用凹み６ｂと同凹み６ｂに設けた内方に突出する刃付電極部６ｃとを設けた受け金具６ａとボルト・ナットよりなる締め付け具６ｄと、同締め付け具６ｄにより受け金具６ａ側に或いはその反対側にスライドするように備えた第２の電線用凹み６ｅと内方に突出する刃付電極部６ｆとを設けた押さえ金具６ｇ等から構成されている。
【００１３】
８は、上記収納部３ａの下部側に設けた仕切板であり、その中央に位置して導出用電極１２を碍子体２の空間部２ｂへ導出するための開口部８ａが形成されている。
【００１４】
１０は限流素子ユニットで、電圧非直線性に優れたＺｎＯ（酸化亜鉛）を主成分とし上記キヤップ金具３の収納部３ａ内に２個直列状態で接続して収納した限流素子９と、該限流素子９の上流端に接続した充電側電極１４と、下流端に接続した接地側電極１１と、一端１２ｃを接地側電極１１を介して限流素子９の下流端側に接続すると共に他端１２ａを碍子体２の空間部２ｂを経て下端側に備えたベ−ス金具２０内に達するまで下方に延長形成した充電側放電電極であるところの導出用電極１２と、導出用電極１２の下端の弧状の放電部１３と、該放電部１３を除く導出用電極１２の外周面と限流素子９の外周面を一体的に被覆したＥＰゴム或いはＥＰＲゴム等の絶縁部材１６とから構成されている。
【００１５】
かかる構成のユニット１０は、収納部３ａに対し限流素子９部分を収納すると共に限流素子９の接地側電極１１に接続する導出用電極１２を収納部３ａの下部の開口部（正確には仕切板８の開口部８ａ）及び空間部２ｂを経て下端側のベ−ス金具２０側へ延長して備えたもので、先端の放電部１３が下部側のベ−ス金具２０内に達した状態で収納されている。つまり、収納完了時には導出用電極１２の下端の放電部１３が碍子体２の下端に固着したベ−ス金具２０内に位置してベ−ス金具２０の内底面２０ｃ間との間で所定の放電ギヤップＧを形成するようになっている。
【００１６】
また上記限流素子９の充電側電極１４はリ−ド線２２によりキヤップ金具３に接続され、接地側電極１１はリード線２２ａにより導出用電極１２に接続されている。なお、限流素子ユニット１０は上記のような収納の際、その絶縁部材１６をキヤップ３の内周面に対し接着剤１７により接着してユニットの保持をさらに確実にしているほか、収納部３ａの下端の開口部８ａから空間部２ｂを経て下方へ突出する導出用電極１２の外周部分の絶縁部材１６にひだ部１６ａを一体形成して放電部１３と収納部３ａの下端の開口部８ａ間の沿面距離を長くし、これにより同間の絶縁性能（耐電圧特性）を高めるようにしている。１６ｂは上記絶縁部材１６と一体形成されたガイド部で、上記のように連続形成されたひだ１６ａ群の中央に位置してひだ１６ａの直径に比して大きく形成され、そのガイド部１６ｂの外周面が空間部２ｂを形成する内周面２ｄに当接している。
【００１７】
なお、上記の限流素子ユニット１０は、同ユニット１０を収納部３ａ及び空間部２ｂに内蔵した場合に一体化された状態を言うのであって、例えば限流素子９を収納部に収納した状態で後からその間隙に絶縁性の充填材を充填して素子外周を被覆するようにしたり、導出用電極１２の被覆と素子の被覆を後から接着して一体化したりする場合等も含むものであり、内蔵前に既にユニット状態に組み立てられたものだけを特に言うものではない。
【００１８】
ベース金具２０はその内底面２０ｃが導出用電極１２の下端側の放電部１３に対向して所定の放電ギヤップＧを形成するように配置されて碍子体２の胴部２ｈの下端２ｊにセメント系、合成樹脂系等の接着材２３により固着されている。また、上記ベース金具２０の底面２０ｂ側には取付用のボルト部２１を垂設固着している。
【００１９】
２４は導出側電極１２の下端側の放電部１３の上部に位置して付設した閉鎖板で、ベ−ス金具２０内を上下に仕切る仕切板２５より若干離間した状態で配設されている。また、上記仕切り板２５の中央には上記導出側電極１２が貫通する開口部２５ａが形成され、該仕切板２５と導出側電極１２とは離間して電気的に絶縁されている。
【００２０】
２０ｅはベ−ス金具２０の側壁の下部に形成した放圧口である。２６はベース金具２０の空間内に同心的に配設してボルト部２１に固設したキヤップ状のベ−ス補助金具であり、同金具２６の側壁２６ａにはベ−ス金具２０の放圧口２６ｅに対向して補助放圧口２６ｂが設けてられている。
【００２１】
２７はベ−ス金具２０に電気的に接続した状態で付設した皿形のア−ク移行金具であり、ベ−ス金具２０の放圧口２０ｅより放圧されたア−ク等を上方に吹き上げて後述の外部放電ギヤップＧ₀間での放電（閃絡）を促進させるようにしたもので、限流素子９が閃絡（短絡）した場合に流れる続流ア−クをベ−ス金具２０の上端の放電部２０ｆとキヤップ金具３の下端の放電部３ｃとで形成する外部ギヤップＧ₀に速やかに移行させて碍子体２側の熱的損傷等を軽減させることを目的としており、同金具２７の上端は碍子体２から離間する方向、つまり、側方に大きく突出して設けられている。なお、該ア−ク移行金具２７には上方にア−クを吹き上げるための斜面状のア−ク案内部２７ａのほか、水抜き穴２７ｂが設けられている。
【００２２】
以上の構成からなる保護装置内蔵碍子装置１は、ベ−ス金具２０側に固着したボルト部２１を電柱の腕金４０の取付穴４０ａに差し込み、取付ナット２８により締め付けて腕金４０に取り付けられる。
【００２３】
また頭部側のキヤップ金具３のクランプ部６に対しては、絶縁電線７を受け金具６ａと押さえ金具６ｇ間に介在させた状態で、クランプ部６に取付接続されるもので、両金具間に介在する同電線７は締め付け具６ｄを回すのに伴って徐々に挟持され締め上げられる。またその場合、内方へ突出する刃付電極部６ｃ、６ｆが絶縁電線７の被覆材７ａを切断或いはこれを突き破って、芯線７ｂと接触するため絶縁電線７とキヤップ金具３間は機械的並びに電気的に接続された状態になる。
【００２４】
２９はキヤップ金具３等の充電部を覆うように絶縁電線７の接続後に頭部２ａに対し被着した絶縁カバ−を示す。
次に上記構成の保護装置内蔵形碍子装置１の動作について説明する。
【００２５】
平常時は、放電ギヤップＧにより導出用電極１２の下端の放電部１３と接地側のベ−ス金具２０間つまり放電ギヤップＧの気中絶縁が充分確保されており、保護装置側は何ら動作しない。
【００２６】
かかる状態にある時、どこかで落雷が発生し、それにより雷サ−ジが高圧配電線（絶縁電線）を伝搬しそれが異常高電圧であれば、絶縁上の弱点部である放電ギヤップＧにおいて閃絡が起こる。そして雷サ−ジは、絶縁電線７−クランプ部６−キヤップ金具３−リ−ド線２２−充電側電極１４−限流素子９−接地側電極１１−リ−ド線２３−導出用電極１２−放電部１３−放電ギヤップＧ−ベ−ス金具２０−腕金４０の放電経路で大地に速やかに放電される。この場合、その放電経路には上記の如く限流素子９と放電ギヤップＧが直列状態で介在するため続流ア−クは遮断され、したがって放電ギヤップＧは絶縁が回復し、平常状態に戻る。
【００２７】
なお、長期使用、湿気侵入或いは性能を越える雷サ−ジの侵入等何らかの原因により限流素子９が劣化し、正常動作が期待できない場合が起こることがある。その場合は、限流素子９は、素子外部或いは素子内部において閃絡し、これに伴って上記放電経路には続流ア−クが流れる。この続流ア−クは当然放電ギヤップＧにおいても流れため、ベ−ス金具２０内の内圧は急激に上昇し、上昇した圧力やア−クは補助放圧口２６ｂと放圧口２０ｅを経てベ−ス金具２０外へ直ちに放出される。また、この場合、上記の圧力によって閉鎖板２４が上方へ曲げられて開口部２５ａが閉鎖され、碍子体２の空間部２ｂの上部側へのア−ク及びガスの流入が避けられるため、碍子体の汚損或いは破壊は防止され安全に放圧されることになる。
【００２８】
またこの時、続流ア−クのエネルギ−が大きければ、放圧されたそのア−クはア−ク移行金具２７の斜面状のア−ク案内部２７ａに沿って上方に吹き上げられる。そしてベ−ス金具２０の放電部２０ｆとキヤップ金具３の放電部３ｃ間の外部ギヤップＧ₀が直ちに閃絡する。これによりア−クは外部ギヤップＧ₀に移行し、碍子体の熱的損傷が軽減される。なお、上記ア−ク移行の際、ア−ク移行金具２７とキヤップ金具３間にさらにア−クが移行することがあるが、その場合も何ら問題が無く、むしろア−クがさらに碍子体２から離間する状態となり碍子体の偏熱破壊に対してはより好ましい結果が得られる。
【００２９】
なお、素子短絡によりキヤップ金具３側の収納部３ａにおいてア−ク発弧や急激な圧力上昇があるが、キヤップ金具３はこれらに十分耐えられる強度を有することは当然であるが、かかる場合は絶縁部材１６の機械的弱点部１６ｃを破裂させると同時にキヤップ金具３の上面に形成した放圧穴３ｆの充填材３０を吹き飛ばして同穴３ｆを確保し、そこからキヤップ金具３とクランプ部６の隙間を経て金具外の上方へ速やかに放圧するようになっている。
【００３０】
図２は本願発明の第２実施例を示す。
本第２実施例は、上記第１実施例における放電ギヤップＧを形成するベ−ス金具２０のボルト部２１の先端に円弧状の放電部２１ａを形成したもので、その他の構造は上記第１実施例と略同一であるため同一部分には同一符号を付してその説明を省略する。
【００３１】
本実施例によれば、ギヤップＧでの放電が良好に行われる。
図３は、本願発明の保護装置内蔵形碍子装置の第３実施例を示す。
本実施例は、上記図１の第１実施例と比べて、限流素子９を下端側のベ−ス金具２０内の収納部２０ａに収納したことと、上記の如く収納部２０ａを下端側のベ−ス２０側に変更したのに伴い、放電ギヤップＧを上端側のキヤップ金具３側で而も金具３外に位置して設けるようにしたことが大きく相違している。つまり、キヤップ金具３外に延長形成した導出電極１２の先端の放電部１３と、キヤップ金具３の上端側の開口部３ｇを気密閉鎖するための銅板、ステンレス板等の薄肉金属からなる封着部材３１を設けてその中央の上方に突出する放電部３１ａとで所定の放電ギヤップＧを形成している。
【００３２】
３２は封着部に充填した気密シ−ル用のシリコ−ン樹脂系の充填材を示す。３３はキヤップ金具３に電気的並びに機械的に接続された逆皿形のア−ク移行金具であり、上端側において続流ア−クが発生した際、上端側の開口部３ｇから放圧されるア−ク等を下端側のベ−ス金具２０側に向かって吹き付けるようにキヤップ金具３に対し下向き状態で一体に設けられている。３３ｂは上記放圧されたアークを下方のベ−ス金具２０側へ吹き付けるように斜面状に形成したアーク案内部、６はア−ク移行金具３３の上面３３ａに一体に固着したクランプ部を示すもので、連結金具３４を介してキヤップ金具３に電気的並びに機械的に接続されている。
【００３３】
次に上記第３実施例における保護装置内蔵形碍子装置１の動作について説明する。
平常時は、放電ギヤップＧにより接地側の導出用電極１２の先端１２ｂの放電部１３と充電側のキヤップ金具３間つまり、封着部材３１の放電部３１ａと放電部１３とで形成する放電ギヤップＧの気中絶縁が充分確保されており、保護装置は何ら動作しない。
【００３４】
かかる状態にある時、何処かで落雷が発生し、それにより雷サ−ジが高圧配電線（絶縁電線）を伝搬しそれが異常高電圧であれば、絶縁上の弱点部である放電ギヤップＧにおいて閃絡が起こる。そして雷サ−ジは、絶縁電線７−クランプ部６−連結金具３４−キヤップ金具３−封着部材３１の放電部３１ａ−放電ギヤップＧ−放電部１３−導出用電極１２−リ−ド線３５−充電側電極３６−限流素子９−接地側電極３７−リ−ド線３８−ベ−ス金具２０−腕金４０の放電経路で大地に速やかに放電される。この場合、その放電経路には上記の如く限流素子９と放電ギヤップＧが直列状態で介在するため続流ア−クは遮断され、したがって放電ギヤップＧは絶縁が回復し、平常状態に戻る。
【００３５】
なお、長期使用、湿気侵入或いは性能を越える雷サ−ジの侵入等何らかの原因により限流素子９が劣化し、正常動作が期待できない場合が起こることがある。その場合は、限流素子は、素子外部（外絡）或いは素子内部（内絡）において閃絡し、これに伴って上記放電経路には続流ア−クが流れる。この続流ア−クは当然放電ギヤップＧにおいても流れため、該ア−クにより封着部材３１が熔融離脱して上端開口部３ｇがアーク移行金具３３部へ開放状態となり、空間部２ｂ内の上昇した内圧等が上端開口部３ｇから速やかに外側へ放圧される。また、この場合、絶縁部材１６のガイド部１６ｂにより碍子体２の空間部２ｂ内へのア−ク及びガスの流入が極力避けられるため、碍子体の汚損或いは破壊は極力防止され安全に放圧されることになる。
【００３６】
またこの時、続流ア−クのエネルギ−が大きければ、そのア−クはア−ク移行金具３３の斜面状のアーク案内部３３ｂにより下端側のベ−ス金具２０側に向かって吹き付けられる。そしてベ−ス金具２０の放電部２０ｆとキヤップ金具３の放電部３ｃ間の外部ギヤップＧ₀が直ちに閃絡する。これによりア−クは外部放電ギヤップＧ₀に移行して遠ざけられ、碍子体の熱的損傷が軽減乃至は防止される。なお、上記ア−ク移行の際、ア−ク移行金具３３とキヤップ金具２０間にさらにア−クが移行することがあるが、その場合も何ら問題が無く、むしろア−クがさらに碍子体２から離間することになるため好ましい結果となる。
【００３７】
なお、素子短絡によりベ−ス金具２０側の収納部２０ａにおいてア−ク発弧や急激な圧力上昇があるが、ベース金具はこれに十分耐えられる強度を有することは当然であるが、かかる場合は絶縁部材１６の機械的弱点部１６ｄを破裂させると同時にベース金具２０の下面（底面）の放圧穴２０ｈの充填材３９を吹き飛ばして同穴２０ｈを確保し、そこからベ−ス金具２０と腕金４０の隙間ｓを経て金具２０外へ速やかに放圧するようになっている。
【００３８】
尚、本第３実施例において、第１実施例と同一の符号を付した部分は第１実施例の部材、部分と同一のものである。
次に図４は本願発明の第４実施例を示す。
【００３９】
本第４実施例は、上記第３実施例における放電ギヤップＧを、導出用電極１２の放電部１３と封着部材３１の中央上部において下方に弧状に形成した放電部３１ｂによって形成している点が相違する。上記放電部３１ｂのへこみ部には気密用のシリコ−ン樹脂等の充填材３２が注入されている。
【００４０】
そして、続流ア−ク（ア−ク）が素子劣化などにより流れた場合に、上昇した内圧により充填材３２もろ共放電部３１ｂを反転離脱或いは熔融離脱せしめて放圧口を形成するようにしたものである。その他の構造は上記第３実施例と同様であるため同一部分には同一符号を付してその説明を省略する。
【００４１】
【発明の効果】
本願発明は以上の構成からなり、
万が一、限流素子の劣化短絡により続流ア−ク（ア−ク）が流れた場合にも上記の如く限流素子は十分な機械的強度を有するベ−ス金具又はキヤップ金具内の収納部にあるため、限流素子の破裂を防止できる。
【００４２】
また、放電ギヤップをベ−ス金具内又はキヤップ金具外に位置して設けたことにより碍子体（碍子面）に対し続流ア−クが直接作用しないため、碍子体の熱的損傷が極力防止できる。
【００４３】
また、上記したように限流素子ユニットをベ−ス金具又はキヤップ金具内と碍子体内に収納或いは配置したため、保護装置を内蔵したにも拘わらず碍子装置全体の形状がさほど大きくならずコンパクトになる。
【００４４】
また、アーク放出口を形成したキヤップ金具又はベ−ス金具にア−ク移行金具を設けることにより、発生した続流ア−ク（ア−ク）を直ちに外部ギヤップＧ₀に移行させて続流ア−クの影響を少なくできるため、続流ア−クに因る碍子体の熱的損傷を軽減できる。
【図面の簡単な説明】
【図１】本願発明の保護装置内蔵形碍子装置の第１実施例の断面図。
【図２】本願発明の保護装置内蔵形碍子装置の第２実施例の断面図であり、第１実施例において放電部の構造が若干異なる場合を示すものである。
【図３】本願発明の保護装置内蔵形碍子装置の第３実施例の断面図。
【図４】本願発明の保護装置内蔵形碍子装置の第４実施例の断面図であり、第２実施例において放電部の構造が若干異なる場合を示すものである。
【符号の説明】
１保護装置内蔵形碍子体装置
２碍子体
２ａ頭部
２ｂ空間部
３キヤップ金具
３ａ収納部
３ｇ上端側の開口部
７絶縁電線
９限流素子
１０限流素子ユニット
１３放電部
１６絶縁部材
２０ベ−ス金具
２０ａ収納部
２７アーク移行金具
３１封着部材
３３ア−ク移行金具
４０腕金
Ｇ放電ギヤップ
Ｇ₀ 外部ギヤップ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a protection device built-in type insulator device, which can reliably prevent the thermal destruction of the insulator due to the continuation arc at the time of flashing, the blowout accident of the insulated wire, etc., and the compact structure of the entire structure. The present invention relates to a built-in insulator device.
[0002]
[Prior art]
In recent years, a high-voltage distribution line has been provided with a protection device having a lightning protection function with respect to an insulator device supporting an insulated wire. This type of protective device includes a so-called current limiting horn type in which a current limiting element is arranged in the archorn, a type with a built-in insulator in which the current limiting element is incorporated in the main body insulator, or a current limiting element unit. Therefore, there is an insulator externally attached type in which this is attached to the insulator.
[0003]
These protective devices are insulated when lightning strikes somewhere on the high-voltage distribution line, and abnormal high voltage such as lightning surge propagates through the distribution line (insulated cable). The surge is quickly released to the ground through the protective device provided in the lever device, which is the weak point, and the wake arc associated with the flash is cut off by the current limiting element of the protective device. Therefore, it is intended to prevent the thermal breakdown of the insulator and the fusing accident of the insulated wire due to the occurrence of the follow-up arc.
[0004]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional protective device, the current limiting element deteriorates due to long-term use, or if the lightning surge enters beyond the performance, the current limiting element may cause a flashover (short circuit) accident and be destroyed. However, in such a case, there are problems such as not only the destruction of the current limiting element but also damage to the main body insulator (insulating container), resulting in stoppage of use or stop of function.
[0005]
Moreover, in the type which attaches a protective device, there exists a problem that the enlargement and weight increase of the whole lever apparatus cannot be avoided. Further, the conventional external discharge gap type is susceptible to the influence of the surroundings, so that there is a problem in operation such that the discharge start voltage varies, the discharge characteristics are not stable, and sufficient protection characteristics cannot be exhibited.
[0006]
In particular, in the case of the current-limiting arc type, there is a problem in terms of mounting columns, aesthetics, insulation, etc. since the discharge starting voltage varies and is mounted in a state of protruding greatly to the side.
[0007]
[Means for Solving the Problems]
The present invention is for solving the above problems,
1st invention of this application, the insulator (2) which formed the space part (2b) penetrated up and down in the body,
The insulator body and the base metal member to be attached to the arm gold (40) as well as secured to the bottom of (2) (20),
Is secured to the head (2a) of the insulator body (2), and insulator body (2) top in the housing portion of the head (2a) (3a) to provided the housing part (3a) of the insulator body (2 ) And a cap fitting (3) electrically connected to the insulated wire (7);
A partition plate (8) provided between the storage part (3a) and the head (2a) of the insulator (2);
A current limiting element (9) housed in the accommodating part (3a) of the cap metal fitting (3) and electrically connected to the cap metal fitting (3), and one end connected to the current limiting element (9) And a discharge electrode (12) in which the discharge portion (13) at the other end penetrates the space portion (2b) and protrudes into the base metal fitting (20), and a discharge electrode excluding the vicinity of the discharge portion (13) A current limiting element unit (10) comprising an outer surface of (12) and an insulating member (16) covering the outer surface of the current limiting element (9);
A guide portion (16b) formed on the insulating material (16) covering the outer surface of the lead-out electrode (12) so as to contact the inner peripheral surface (2d) forming the space portion (2b);
A discharge gap (G) for electrically connecting the base metal fitting (20) and the discharge part (13) with a predetermined gap;
It consists of
[0008]
Further, the second invention of the present application is an insulator body (2) in which a space portion (2b) penetrating vertically is formed in the body,
Is fixed to a lower portion of the insulator body (2), and, provided the housing portion housing portion to the lower of (20a) provided in the insulator body (2) and (20a) to the outside of the insulator body (2), further arm gold A base fitting (20) attached to (40) ;
A partition plate (25) provided between the storage part (20a) and the lower part of the insulator,
A cap fitting (3) fixed to the head of the insulator (2) and electrically connected to the insulated wire (7);
A sealing member (31) which is electrically connected and fixed to the cap fitting (3) and is released by internal pressure;
A current limiting element (9) housed in the housing part (20a) of the base metal fitting (20) and electrically connected to the base metal fitting (20), and one end connected to the current limiting element (9). A discharge electrode (12) having a discharge portion (13) at the other end penetrating through the space portion (2b) and protruding to the cap fitting (3) portion, and a discharge electrode (except for the vicinity of the discharge portion (13)) A current limiting element unit (10) comprising an outer surface of 12) and an insulating member (16) covering the outer surface of the current limiting element (9);
A guide portion (16b) formed on the insulating material (16) covering the outer surface of the lead-out electrode (12) so as to contact the inner peripheral surface (2d) forming the space portion (2b);
A discharge gap (G) for electrically connecting the sealing member (31) fixed to the cap fitting (3) and the discharge part (13) at a predetermined gap;
It is characterized by comprising.
[0009]
Further, in the third invention of the present application, a side pressure release port (20e) is formed in the base metal fitting (20) in the first invention, and the pressure release port is formed in a side portion of the base metal fitting (20). is provided with a mouth arc transition fitting depressurized towards the arc which is relieved from (20e) in cap plate (3) side (27).
[0010]
The fourth invention of the present application, the upper portion of the sealing member (31) in the second invention, toward the encapsulating adhesive member (31) base metal fitting (20) side arc which relieved the withdrawal of An arc transition metal fitting (33) for releasing the pressure is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments shown in the drawings.
FIG. 1 shows a first embodiment.
[0012]
Reference numeral 1 denotes a lever device with a built-in protection device. A cap metal fitting 3 made of iron, stainless steel iron or the like is attached to a head 2a of a lever body 2 made of a deep groove type insulator by a cement-based or synthetic resin-based adhesive material 4. It is fixed. A storage portion 3a is formed inside the cap 3, and the cap 3 is fixed so that a space by the storage portion 3a is formed above the head 2a. A clamp portion 6 is fixed to the upper outer surface 3b of the cap metal fitting 3 by welding or the like, or is integrally assembled with the cap metal fitting. The clamp 6 includes a first metal recess 6b, a receiving metal 6a provided with an inwardly projecting bladed electrode 6c provided in the recess 6b, a clamp 6d made of a bolt and a nut, and the clamp It comprises a holding metal fitting 6g provided with a second electric wire recess 6e provided so as to slide to the receiving metal 6a side or the opposite side by 6d and an electrode portion 6f with a blade projecting inwardly.
[0013]
Reference numeral 8 denotes a partition plate provided on the lower side of the storage portion 3a, and an opening 8a for leading the lead-out electrode 12 to the space portion 2b of the insulator 2 is formed at the center thereof.
[0014]
10 is a current limiting element unit, and the current limiting element 9 is composed of ZnO (zinc oxide) excellent in voltage non-linearity as a main component and is connected in series in the accommodating portion 3a of the cap metal fitting 3; The charging side electrode 14 connected to the upstream end of the current limiting element 9, the ground side electrode 11 connected to the downstream end, and one end 12 c are connected to the downstream end side of the current limiting element 9 via the ground side electrode 11. The lead-out electrode 12 is a charge-side discharge electrode that is formed by extending the other end 12a downward until it reaches the inside of the base metal fitting 20 provided on the lower end side through the space 2b of the insulator body 2, and the lead-out electrode 12 And an insulating member 16 such as EP rubber or EPR rubber integrally covering the outer peripheral surface of the lead-out electrode 12 excluding the discharge portion 13 and the outer peripheral surface of the current limiting element 9. Has been.
[0015]
The unit 10 having such a configuration accommodates the current limiting element 9 portion in the accommodating portion 3a and connects the lead-out electrode 12 connected to the ground-side electrode 11 of the current limiting element 9 to the opening (precisely, the lower portion of the accommodating portion 3a. It is provided with an opening 8a) of the partition plate 8 and the space 2b extending to the base metal fitting 20 on the lower end side, so that the discharge part 13 at the tip reaches the base metal fitting 20 on the lower side. It is stored in a state. In other words, when the storage is completed, the discharge portion 13 at the lower end of the lead-out electrode 12 is positioned in the base metal 20 fixed to the lower end of the insulator 2 and between the inner bottom surface 20c of the base metal 20 is predetermined. A discharge gap G is formed.
[0016]
Further, the charging side electrode 14 of the current limiting element 9 is connected to the cap fitting 3 by a lead wire 22, and the ground side electrode 11 is connected to the lead-out electrode 12 by a lead wire 22a. When the current limiting element unit 10 is housed as described above, the insulating member 16 is adhered to the inner peripheral surface of the cap 3 by an adhesive 17 to further secure the unit, and the housing portion 3a. A pleated portion 16a is formed integrally with the insulating member 16 on the outer peripheral portion of the lead-out electrode 12 projecting downward from the lower opening 8a through the space 2b, and between the discharge portion 13 and the lower opening 8a of the storage portion 3a. The creepage distance is increased, thereby improving the insulation performance (voltage resistance). Reference numeral 16b is a guide part integrally formed with the insulating member 16, and is formed at the center of the pleat 16a group continuously formed as described above, and is larger than the diameter of the pleat 16a, and the outer periphery of the guide part 16b. The surface is in contact with the inner peripheral surface 2d that forms the space 2b.
[0017]
In addition, said current limiting element unit 10 says the state integrated when the unit 10 is built in the accommodating part 3a and the space part 2b, Comprising: For example, the state which accommodated the current limiting element 9 in the accommodating part This includes cases where the gap is filled with an insulating filler later to cover the outer periphery of the element, or the covering of the lead-out electrode 12 and the covering of the element are bonded and integrated later. Yes, it doesn't mean anything that has already been assembled into a unit state prior to installation.
[0018]
The base metal fitting 20 is disposed so that the inner bottom surface 20c thereof faces the discharge portion 13 on the lower end side of the lead-out electrode 12 to form a predetermined discharge gap G, and is cemented to the lower end 2j of the trunk portion 2h of the insulator 2. It is fixed by an adhesive 23 such as a synthetic resin. Further, a mounting bolt portion 21 is vertically fixed to the bottom surface 20b side of the base metal fitting 20.
[0019]
Reference numeral 24 denotes a closing plate which is provided at the upper part of the discharge portion 13 on the lower end side of the lead-out side electrode 12 and is arranged in a state slightly separated from the partition plate 25 which partitions the inside of the base metal fitting 20 up and down. An opening 25a through which the lead-out electrode 12 passes is formed in the center of the partition plate 25, and the partition plate 25 and the lead-out electrode 12 are separated and electrically insulated.
[0020]
Reference numeral 20 e denotes a pressure relief port formed in the lower part of the side wall of the base metal fitting 20. Reference numeral 26 denotes a cap-shaped base auxiliary metal fitting concentrically disposed in the space of the base metal fitting 20 and fixed to the bolt portion 21. The pressure relief of the base metal fitting 20 is applied to the side wall 26a of the metal fitting 26. An auxiliary pressure relief port 26b is provided opposite to the port 26e.
[0021]
Reference numeral 27 denotes a dish-shaped arc transition metal fitting attached in a state of being electrically connected to the base metal fitting 20. The arc released from the pressure release port 20e of the base metal fitting 20 is directed upward. blown up and which was so as to facilitate the discharge (flashover) in between the external discharge Giyappu G ₀ will be described later, follow current flows when the current limiting element 9 has flashover (shorted) a - click a base - scan fittings aims at reducing the outside Giyappu G ₀ to be formed at the lower end of the discharge portion 3c of the discharge portion 20f and the cap fitting 3 at the upper end of the 20 promptly shifts insulator body 2 side of the thermal damage and the like, the The upper end of the metal fitting 27 is provided so as to protrude greatly in the direction away from the insulator body 2, that is, on the side. The arc transition metal fitting 27 is provided with a drainage hole 27b in addition to a sloped arc guide portion 27a for blowing up the arc upward.
[0022]
The insulator device 1 with a built-in protection device having the above-described configuration is attached to the arm metal 40 by inserting the bolt portion 21 fixed to the base metal fitting 20 side into the mounting hole 40a of the arm metal 40 of the utility pole and tightening it with the mounting nut 28. .
[0023]
Further, the clamp portion 6 of the cap metal fitting 3 on the head side is attached and connected to the clamp portion 6 with the insulated wire 7 interposed between the metal fitting 6a and the holding metal fitting 6g. The electric wire 7 intervening is gradually clamped and tightened as the fastening tool 6d is turned. In this case, the inwardly projecting electrode portions 6c, 6f cut or break through the covering material 7a of the insulated wire 7 and contact with the core wire 7b, so that the insulation wire 7 and the cap metal fitting 3 are mechanically arranged. It is in an electrically connected state.
[0024]
Reference numeral 29 denotes an insulating cover attached to the head 2a after the insulated wire 7 is connected so as to cover the charging part such as the cap fitting 3 or the like.
Next, the operation of the protective device built-in insulator device 1 having the above-described configuration will be described.
[0025]
In normal times, the discharge gap G ensures sufficient insulation between the discharge portion 13 at the lower end of the lead-out electrode 12 and the base metal fitting 20 on the ground side, that is, the discharge gap G, and the protective device side does not operate at all. .
[0026]
In such a state, if a lightning strike occurs somewhere and the lightning surge propagates through the high-voltage distribution line (insulated wire) and it is an abnormally high voltage, the discharge gap G, which is a weak point on insulation, is generated. A flashover occurs. The lightning surge consists of an insulated wire 7-a clamp 6-a cap fitting 3-a lead wire 22-a charging side electrode 14-a current limiting element 9-a ground side electrode 11-a lead wire 23-a lead electrode 12 -Discharge part 13-Discharge gear gap G-Base metal fitting 20-Arm metal 40 is quickly discharged to the ground. In this case, since the current limiting element 9 and the discharge gap G are interposed in series in the discharge path as described above, the continuation arc is cut off, so that the insulation of the discharge gap G is restored and returns to the normal state.
[0027]
Note that the current limiting element 9 may be deteriorated due to some reason such as long-term use, moisture intrusion, or lightning surge exceeding performance, and normal operation may not be expected. In that case, the current-limiting element 9 flashes outside the element or inside the element, and accordingly, a follow-up arc flows through the discharge path. Since this continuity arc naturally flows also in the discharge gap G, the internal pressure in the base metal fitting 20 rises rapidly, and the increased pressure and arc pass through the auxiliary pressure relief port 26b and the pressure relief port 20e. It is immediately discharged out of the base metal fitting 20. Further, in this case, the closing plate 24 is bent upward by the above-mentioned pressure, the opening 25a is closed, and arc and gas inflow to the upper side of the space 2b of the insulator 2 are avoided. Body fouling or destruction is prevented and safely released.
[0028]
At this time, if the energy of the follow-up arc is large, the released arc is blown upward along the arc-shaped arc guide portion 27a of the arc transition metal fitting 27. Then, the external gear G ₀ between the discharge part 20 f of the base metal 20 and the discharge part 3 c of the cap metal 3 is immediately flashed. Thus A - click moves to the outside Giyappu G _0, thermal damage of the insulator body is reduced. In addition, in the case of the above arc transfer, there is a case where the arc further moves between the arc transition metal fitting 27 and the cap metal fitting 3, but in that case, there is no problem. More favorable results can be obtained for the thermal destruction of the insulator body.
[0029]
In addition, although there is arc arcing or a sudden pressure rise in the storage part 3a on the cap metal fitting 3 side due to an element short circuit, it is natural that the cap metal fitting 3 has sufficient strength to withstand these, The mechanical weak point 16c of the insulating member 16 is ruptured, and at the same time, the filler 30 in the pressure release hole 3f formed on the upper surface of the cap fitting 3 is blown off to secure the hole 3f, from which the gap between the cap fitting 3 and the clamp portion 6 is secured. After that, the pressure is quickly released upwards outside the bracket.
[0030]
FIG. 2 shows a second embodiment of the present invention.
In the second embodiment, an arc-shaped discharge portion 21a is formed at the tip of the bolt portion 21 of the base metal fitting 20 that forms the discharge gap G in the first embodiment, and the other structures are the same as those in the first embodiment. Since it is substantially the same as the embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0031]
According to the present embodiment, the discharge at the gear G is satisfactorily performed.
FIG. 3 shows a third embodiment of a lever device with a built-in protection device according to the present invention.
In this embodiment, the current limiting element 9 is stored in the storage portion 20a in the base metal fitting 20 on the lower end side as compared with the first embodiment shown in FIG. With the change to the base 20 side, it is greatly different that the discharge gap G is provided on the cap metal fitting 3 side on the upper end side and located outside the metal fitting 3. That is, a sealing member made of a thin metal such as a copper plate or a stainless steel plate for hermetically sealing the discharge portion 13 at the tip of the lead-out electrode 12 extended outside the cap fitting 3 and the opening 3g on the upper end side of the cap fitting 3 A predetermined discharge gap G is formed by the discharge portion 31a provided with 31 and protruding upward in the center thereof.
[0032]
Reference numeral 32 denotes a silicone resin filler for an airtight seal filled in the sealing portion. Reference numeral 33 denotes an inverted dish-shaped arc transition metal fitting electrically and mechanically connected to the cap metal fitting 3. When a follow-up arc is generated on the upper end side, the pressure is released from the opening 3g on the upper end side. Are provided integrally with the cap fitting 3 so as to be blown toward the base fitting 20 on the lower end side. Reference numeral 33b denotes an arc guide portion formed in a slope shape so as to blow the released arc toward the base metal fitting 20 below, and 6 denotes a clamp portion integrally fixed to the upper surface 33a of the arc transition metal fitting 33. In this case, the cap metal fitting 3 is electrically and mechanically connected via the connecting metal fitting 34.
[0033]
Next, the operation of the protective device built-in insulator device 1 in the third embodiment will be described.
Under normal conditions, the discharge gap formed by the discharge gap G is formed between the discharge portion 13 at the tip 12b of the ground-side lead-out electrode 12 and the cap metal fitting 3 on the charge side, that is, between the discharge portion 31a and the discharge portion 13 of the sealing member 31. The air insulation of G is sufficiently secured, and the protective device does not operate at all.
[0034]
In such a state, if a lightning strike occurs somewhere, and the lightning surge propagates through the high-voltage distribution line (insulated wire) and it is an abnormally high voltage, the discharge gap G, which is a weak point on insulation, is generated. A flashover occurs. Then, the lightning surge consists of an insulated wire 7-a clamp portion 6-a connecting fitting 34-a cap fitting 3-a discharge portion 31a of the sealing member 31-a discharge gap G-a discharge portion 13-a lead electrode 12-a lead wire 35 It is quickly discharged to the ground through the discharge path of the charge side electrode 36, the current limiting element 9, the ground side electrode 37, the lead wire 38, the base metal 20, and the arm metal 40. In this case, since the current limiting element 9 and the discharge gap G are interposed in series in the discharge path as described above, the continuation arc is cut off, so that the insulation of the discharge gap G is restored and returns to the normal state.
[0035]
Note that the current limiting element 9 may be deteriorated due to some reason such as long-term use, moisture intrusion, or lightning surge exceeding performance, and normal operation may not be expected. In that case, the current-limiting element flashes outside the element (outer envelope) or inside the element (inner envelope), and a follow-up arc flows along the discharge path. Since this continuity arc naturally flows also in the discharge gap G, the sealing member 31 is melted and separated by the arc, and the upper end opening 3g is opened to the arc transition fitting 33, and the space 2b The increased internal pressure or the like is quickly released outward from the upper end opening 3g. Further, in this case, since the arc and gas inflow into the space 2b of the insulator 2 are avoided as much as possible by the guide portion 16b of the insulating member 16, the insulator is prevented from being contaminated or broken as much as possible and safely released. Will be.
[0036]
At this time, if the energy of the follower arc is large, the arc is blown toward the base metal fitting 20 side on the lower end side by the inclined arc guide portion 33b of the arc transition metal fitting 33. . Then, the external gear G ₀ between the discharge part 20 f of the base metal 20 and the discharge part 3 c of the cap metal 3 is immediately flashed. Thus A - click is moved away proceeds to external discharge Giyappu G _0, thermal damage of the insulator body is reduced or can be prevented. In addition, when the arc is transferred, the arc may be further transferred between the arc transfer fitting 33 and the cap fitting 20. However, there is no problem in this case, and the arc is further increased. This is a favorable result because it is separated from 2.
[0037]
In addition, although the arc is generated and the pressure is rapidly increased in the storage portion 20a on the base metal fitting 20 side due to the element short circuit, it is natural that the base metal fitting has sufficient strength to withstand this. Ruptures the mechanical weak point 16d of the insulating member 16 and simultaneously blows away the filler 39 in the pressure release hole 20h on the lower surface (bottom surface) of the base metal 20 to secure the hole 20h, from which the base metal 20 and the arm are secured. The pressure is quickly released to the outside of the metal fitting 20 through the gap s of the gold 40.
[0038]
In the third embodiment, the same reference numerals as those in the first embodiment are the same as the members and parts in the first embodiment.
Next, FIG. 4 shows a fourth embodiment of the present invention.
[0039]
In the fourth embodiment, the discharge gap G in the third embodiment is formed by the discharge portion 13 of the lead-out electrode 12 and the discharge portion 31b formed in an arc shape downward in the central upper portion of the sealing member 31. Is different. A filler 32 such as an airtight silicone resin is injected into the recess of the discharge part 31b.
[0040]
Then, when the follow-up arc (arc) flows due to device deterioration or the like, the discharge material 31 is reversed or melted away by the increased internal pressure so as to form a pressure release port. It is a thing. Since other structures are the same as those of the third embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0041]
【The invention's effect】
The present invention comprises the above configuration,
In the unlikely event that a continuation arc (arc) flows due to a deterioration short circuit of the current limiting element, the current limiting element has a sufficient mechanical strength as described above. Therefore, the current limiting element can be prevented from bursting.
[0042]
In addition, since the discharge arc does not directly act on the insulator (insulator surface) by disposing the discharge gap in the base bracket or outside the cap bracket, thermal damage to the insulator is prevented as much as possible. it can.
[0043]
In addition, since the current limiting element unit is housed or arranged in the base metal fitting or the cap metal fitting and the insulator as described above, the overall shape of the insulator device is not so large and compact despite the built-in protective device. .
[0044]
Also, cap fitting or base to form an arc outlet - by providing a click transition metal, follow current A generated - - A to the scan bracket click (A - h) immediately transferred to external Giyappu G ₀ to be continued flow Since the influence of the arc can be reduced, the thermal damage of the insulator due to the follow-up arc can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a first embodiment of a protective device built-in insulator device according to the present invention;
FIG. 2 is a cross-sectional view of a second embodiment of the protection device built-in type insulator device of the present invention, and shows a case where the structure of the discharge part is slightly different in the first embodiment.
FIG. 3 is a cross-sectional view of a third embodiment of a protective device built-in insulator device according to the present invention;
FIG. 4 is a cross-sectional view of a fourth embodiment of an insulator device with a built-in protection device according to the present invention, and shows a case where the structure of the discharge part is slightly different in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Protective-device built-in insulator body apparatus 2 Insulator body 2a Head part 2b Space part 3 Cap metal fitting 3a Storage part 3g Opening part 7 at the upper end side Insulated wire 9 Current limiting element 10 Current limiting element unit 13 Discharge part 16 Insulating member 20 Metal fitting 20a Storage part 27 Arc transition metal fitting 31 Sealing member 33 Arc transition metal fitting 40 Arm metal G Discharge gear gap G ₀ External gear gap

Claims

An insulator (2) having a space (2b) penetrating vertically in the body;
The insulator body and the base metal member to be attached to the arm gold (40) as well as secured to the bottom of (2) (20),
Is secured to the head (2a) of the insulator body (2), and insulator body (2) top in the housing portion of the head (2a) (3a) to provided the housing part (3a) of the insulator body (2 ) And a cap fitting (3) electrically connected to the insulated wire (7);
A partition plate (8) provided between the storage part (3a) and the head (2a) of the insulator (2);
A current limiting element (9) housed in the accommodating part (3a) of the cap metal fitting (3) and electrically connected to the cap metal fitting (3), and one end connected to the current limiting element (9) And a discharge electrode (12) in which the discharge portion (13) at the other end penetrates the space portion (2b) and protrudes into the base metal fitting (20), and a discharge electrode excluding the vicinity of the discharge portion (13) A current limiting element unit (10) comprising an outer surface of (12) and an insulating member (16) covering the outer surface of the current limiting element (9);
A guide portion (16b) formed on the insulating material (16) covering the outer surface of the lead-out electrode (12) so as to contact the inner peripheral surface (2d) forming the space portion (2b);
A discharge gap (G) for electrically connecting the base metal fitting (20) and the discharge part (13) with a predetermined gap;
An insulator device with a built-in protection device, characterized by comprising:

An insulator (2) having a space (2b) penetrating vertically in the body;
Is fixed to a lower portion of the insulator body (2), and, provided the housing portion housing portion to the lower of (20a) provided in the insulator body (2) and (20a) to the outside of the insulator body (2), further arm gold A base fitting (20) attached to (40) ;
A partition plate (25) provided between the storage part (20a) and the lower part of the insulator,
A cap fitting (3) fixed to the head of the insulator (2) and electrically connected to the insulated wire (7);
A sealing member (31) which is electrically connected and fixed to the cap fitting (3) and is released by internal pressure;
A current limiting element (9) housed in the housing part (20a) of the base metal fitting (20) and electrically connected to the base metal fitting (20), and one end connected to the current limiting element (9). A discharge electrode (12) having a discharge portion (13) at the other end penetrating through the space portion (2b) and protruding to the cap fitting (3) portion, and a discharge electrode (except for the vicinity of the discharge portion (13)) A current limiting element unit (10) comprising an outer surface of 12) and an insulating member (16) covering the outer surface of the current limiting element (9);
A guide portion (16b) formed on the insulating material (16) covering the outer surface of the lead-out electrode (12) so as to contact the inner peripheral surface (2d) forming the space portion (2b);
A discharge gap (G) for electrically connecting the sealing member (31) fixed to the cap fitting (3) and the discharge part (13) at a predetermined gap;
An insulator device with a built-in protection device, characterized by comprising:

The base bracket (20) according to claim 1 to form a release to the lateral pressure port (20e), the side of the base bracket (20), arc was relieved from the discharge pressure port (20e) the cap plate (3) protection device built-insulator device having a headed discharge pressure arc transition fitting (27) on the side.

The top of sealing member according to claim 2, wherein (31), the arc transition fittings depressurized towards the arc which is pressure-relieved by withdrawal of encapsulating adhesive member (31) to the base bracket (20) side (33) A built-in insulator device with built-in protection device.