JP3749572B2

JP3749572B2 - Discharge electrode device for insulated wires

Info

Publication number: JP3749572B2
Application number: JP14531796A
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: 1996-06-07
Filing date: 1996-06-07
Publication date: 2006-03-01
Anticipated expiration: 2016-06-07
Also published as: JPH09330780A

Description

【０００１】
【発明の属する技術分野】
本願発明は支持碍子の頭部の把握部に高圧配電線路の絶縁電線をバインド線により緊縛して同線を支持するようにしたものにおいて、その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放電電極装置の改良に係る。
【０００２】
【従来の技術】
絶縁電線を使用した高圧配電線路では、図１７に示すように支持碍子１０７の近傍に碍子保護装置１００が付設されている。一般に上記碍子保護装置１００は支持碍子１０７の底面側に取り付けられた取付金具１０２に限流素子ユニット１０３と接地電極１０４を設け、絶縁電線１０５に放電電極装置１０６を設けた構成であり、配電線路を伝搬して来た雷サージ等の異常電圧を放電電極装置１０６から接地電極１０４に放電し、腕金１０１を通して大地へ流すことで碍子１０７を保護するようになっている。なお、この放電の際、放電経路に介在する上記限流素子ユニット１０３により、商用周波の続流がしゃ断される。
【０００３】
上記放電電極装置１０６は図１８に示すように、絶縁電線１０５の外周に対して絶縁カバー１０８の内面の全周に半流動性絶縁材料の絶縁コンパウンド１０９を介して上記絶縁カバー１０８を装着させ、上記絶縁カバー１０８に装着した接触電極部１１０に設けられた針電極１１１の先端部１１１ａを上記絶縁電線１０５の被覆部１０５ａを突き破って芯線１０５ｂに接触させたものである。
【０００４】
【発明が解決しようとする課題】
ところで、上記従来の放電電極装置１０６は、針電極１１１等の充電部の露出を防止し、かつ絶縁カバー１０８に止着した接触電極部１１０の針電極１１１によって突き破られた絶縁電線１０５の被覆部１０５ａから芯線１０５ｂに雨水が侵入しないようにするための絶縁コンパウンド１０９に粘着ブチルゴム等の半流動性絶縁材料を用いているため、一度放電電極装置１０６を取り付けるとその取付位置の変更等により放電電極装置１０６を取り外す場合に、その高い粘着性により取り外し作業が簡単にできず、取り外し方によっては放電電極装置１０６の再使用が難しくなると言う問題点があった。
【０００５】
また、上記従来の放電電極装置１０６にあっては、放電電極装置１０６を絶縁電線１０５に取り付ける際に、絶縁電線１０５の径の違いにより、絶縁コンパウンド１０９と絶縁電線１０５並びに絶縁カバー１０８との密着度合の異なりが生じるため、それぞれ絶縁電線１０５の径に対応した種類の放電電極装置１０６を用意して作業しなければならず、コスト高や作業性が悪いと言う問題点があった。
【０００６】
また、上記従来の放電電極装置１０６はその接触電極部１１０の放電部１１１ｂが接地電極１０４側に向くように、すなわち周方向に一致させる位置決め（調節）をすることが難しいため、取り付け時に放電電極装置１０６が周方向に傾いた状態になってしまい、接触電極１１０の放電部１１１ｂが接地電極１０４に対し正確に対向しなくなり、放電開始電圧が一定にならないと言う問題点があった。
【０００７】
また、絶縁コンパウンド１０９が絶縁電線１０５の外周面に密着するように絶縁カバー１０８の内面全体に設けられているため多量の絶縁コンパウンドを必要とし、コストがその分余計に高くなると言う問題点があった。
【０００８】
【課題を解決しようとするための手段】
本願発明は、上記問題点を解決するためのもので、
第１の発明は、バインド線（３）を巻き付けた絶縁電線（４）の外周面に対して装着する絶縁カバー（２）と、該絶縁カバー（２）にはネジ孔（６ｄ）を形成して該ネジ孔（６ｄ）に螺着した接触電極部（１３）と、該接触電極部（１３）をネジを締め込むことで針状に形成した先端部（１４ａ）が絶縁電線（４）の芯線（４ｂ）に接触する針電極（１４）を備えた絶縁電線用放電電極装置において、
上記絶縁カバー（２）の内面（５ｃ）に、バインド線（３）がはまる溝（１２）を設け、
更に、絶縁カバー（２）内に、スペーサ（１７）（１７′）を分離可能に備え、該スペーサ（１７）（１７′）に、対応する径の絶縁電線（４）の外周に接触する接触部（１７ｅ）（１７ｅ′）と、上記絶縁電線（４）に巻装されたバインド線（３）がはまる溝（１７ｆ）（１７ｆ′）を形成したことを特徴とするものである。
【０００９】
第２の発明は、バインド線（３）を巻き付けた絶縁電線（４）の外周面に対して装着する絶縁カバー（２）と、該絶縁カバー（２）にはネジ孔（６ｄ）を形成して該ネジ孔（６ｄ）に螺着した接触電極部（１３）と、該接触電極部（１３）をネジを締め込むことで針状に形成した先端部（１４ａ）が絶縁電線（４）の芯線（４ｂ）に接触する針電極（１４）を備えた絶縁電線用放電電極装置において、
上記絶縁カバー（２）の内面（５ｃ）に、バインド線（３）がはまる溝（１２）を設け、
更に、絶縁カバー（２）内に、スペーサ（１７）（１７′）を分離可能に備え、該スペーサ（１７）（１７′）に、対応する径の絶縁電線（４）の外周に接触する接触部（１７ｅ）（１７ｅ′）と、上記絶縁電線（４）に巻装されたバインド線（３）がはまる溝（１７ｆ）（１７ｆ′）を形成し、
更に、前記針電極（１４）の先端部（１４ａ）に、針電極（１４）を絶縁電線（４）の芯線（４ｂ）に接触させた場合に、絶縁電線（４）の被覆部（４ａ）と接触電極部（１３）の上面（１３ｂ）との間に密着するＯリング又はパッキン（１６）を嵌着したことを特徴とするものである。
【００１１】
【発明の実施の形態】
以下、図１乃至図１６に示す実施例に基づき本願発明の実施の態様について説明する。
【００１２】
１は本願発明の絶縁電線用放電電極装置で、２はバインド線３を巻き付けた絶縁電線４に対しその外周面を覆うようにして取り付けられる耐候性等に優れたＥＶＡ（エチレンビニ−ルアルコ−ル）樹脂等の合成樹脂からなる絶縁カバーである。同カバー２は円筒状に形成されているとともにこれを上カバー５と下カバー６とで２分割に構成され、該上下カバー５，６がヒンジ７により開閉自在に連結されている。更に上カバー５における上記ヒンジ７と反対側の片２ｂには角状の突起５ａが内側に向かって一体形成され、また下カバー６における上記ヒンジ７と反対側の片２ｂ′には上記突起５ａが嵌入する角状の穴６ａが一体形成されており、上下のカバー５，６を閉じた場合に、突起５ａが穴６ａに嵌合し、かつ突起５ａに形成した爪部５ａ′が穴６ａの外面側に係止して、上下カバー５，６の閉じ状態が保持されるようになっている。
【００１３】
２ｃは上記上下カバー５，６の両端に一体成形した遮閉板で、屈曲可能な薄板で形成され、かつ上下カバー５，６を絶縁電線４に閉じて止着する場合に、絶縁電線４の直径に応じて容易に広がるよう切目（スリット）が形成されている。
【００１４】
また、上カバー５における上記突起５ａが設けられている片２ｂの中央には取付ネジ孔５ｂが形成され、下カバー６における上記穴６ａが形成されている片２ｂ′の中央には取付ネジ貫通孔６ｂが形成されており、上下カバー５，６の閉状態において、貫通孔６ｂに、絶縁カバー２の底面２ｄ側からＥＶＡ樹脂等の合成樹脂からなる取付ネジ９を挿入し、そのネジ部を取付ネジ孔５ｂにネジ着して上下カバー５，６が開かないようになっている。なお、上記取付ネジ９は下カバー６の取付ネジ貫通孔６ｂに嵌まっており、該取付ネジ９の先端部分９ａには、図１，図４に示すような、外径が取付ネジ貫通孔６ｂの径より大きく、内径が取付ネジ９の外周面に密着するドーナツ形状でかつ肉厚の薄いストッパ１０が嵌挿され、取付ネジ９が下カバー６から落下しないように保持している。また該取付ネジ９は、これを締め付ける際に大きな摩擦を生じないようにナイロン、ビニール等の柔らかい合成樹脂やゴム等から形成されている。
【００１５】
上記上カバー５の内面５ｃ側でかつ両側部には、上カバー５と同心円で半径の小さい円弧状電線接触部１１ａ′，１１ｂ′，１１ｃ′を有する扇形状をした複数（実施例では３個）のリブ１１ａ，１１ｂ，１１ｃが並列して該カバー５と一体に形成されている。このリブ１１ａ，１１ｂ，１１ｃ円弧状内面は、上下カバー５，６を閉じた場合に、例えば径が１９．５ｍｍ（１５０ｓｑ）の大きさの絶縁電線４の外周に接触する径に形成されている。
【００１６】
該３個のリブ１１ａ，１１ｂ，１１ｃにおける絶縁電線４のバインド線３が通過する側の端面１１ａ″，１１ｂ″，１１ｃ″は、図２に示すように、バインド線３の通過する傾斜（カバー２の軸線に対して傾斜）に沿って欠除されており、すなわち、図２に示すように、外側のリブ１１ｃから内側のリブ１１ａに対し順次周方向長が短くなっている。
【００１７】
また、このようなリブ１１ａ，１１ｂ，１１ｃは、図２に示すように、上カバー５の両端部内面において、上カバー５の中央を中心として点対称的に設けられている。
【００１８】
そして、上記両側部のリブ１１ａ，１１ｂ，１１ｃの端面１１ａ″，１１ｂ″，１１ｃ″によって図２に示すように、絶縁電線４に巻き付けられたバインド線３をはめ込むための溝１２を形成しており、絶縁カバー２を絶縁電線４に取り付ける際に上記溝１２にバインド線３をはめ込むことでバインド線３が端面１１ａ″，１１ｂ″，１１ｃ″に当たって絶縁電線４に対する絶縁カバー２の周方向の位置決めがされ、後述する接触電極部１３の放電部１５が接地電極２４に正確に対向するようになっている。
【００１９】
また、上記両側部に形成した両リブ１１ａ，１１ａ間における上カバー５の内面部は取付用のスペースになっており、該部が、後述するスペーサ１７の取付部５ｆを構成している。該取付部５ｆには、その上カバー５の内面５ｃと外面５ｄに貫通する取付孔５ｅが形成されている。
【００２０】
上記下カバー６の底部中央には後述する接触電極部１３をネジ着するためのネジ孔６ｄを内外方向に貫通して刻設した凸部６ｅが形成されている。更に、底面６ｃの両端６ｆ部側には絶縁カバー２を絶縁電線４に取り付ける時に、工具（図示されていない）を挿入するための貫通孔６ｇが形成されている。なお、上記貫通孔６ｇは絶縁カバー２を絶縁電線４に取り付けた後は、絶縁カバー２内に侵入した雨水等を排出するための水抜き孔として使用するものである。
【００２１】
１３は接触電極部であり、図５に示すように、ステンレス或いは黄銅等の金属からなる針電極１４と、該針電極１４の先端部１４ａを除く外周面を被覆するとともに放電用穴１３ｆを形成し、更に側面に雄ネジ１３ａを刻設し、更に下部に六角状のナット部１３ｃを一体成形した合成樹脂製のネジ部１３ｄとからなっている。そして、上記接触電極部１３の外周面に形成した雄ネジ部１３ａを上記下カバー６の凸部６ｅに刻設したネジ孔６ｄに対し下方から締め付けて図９のような状態に備えられている。
【００２２】
なお、上記放電用穴１３ｆの底面１４ｂは絶縁カバー２を絶縁電線４に取り付けた場合に接地電極２４に対向し、絶縁電線４に発生した異常電圧を接地電極２４に放電するための放電部１５となっている。
【００２３】
１６は、図６に示すような形状のＯリングで、ゴムや軟質の合成樹脂等の絶縁部材で形成されており、図９に示すように、上記針電極１４の先端部１４ａに嵌挿され必要により粘着材や接着剤等で止着保持されている。
【００２４】
なお、本願実施例ではＯリング１６について図示しているが、Ｏリング１６の代わりに絶縁電線４の被覆部４ａと接触電極部１３の上面１３ｂに密着して接触するようにしたパッキンを用いてもよい。また上記Ｏリング１６又はパッキンの防水性をさらに高めるためにＯリング１６又はパッキンの穴内あるいは針電極１４の先端部１４ａにグリス等のシール剤をあらかじめ塗布しておけば、さらに防水性を完全なものにすることができる。
【００２５】
１７，１７′はスペーサで、上記絶縁カバー２と同じＥＶＡ樹脂等の合成樹脂で形成され、その外周形状は上記上カバー５のスペーサ取付部５ｆに分離可能に装着できるように形成されている。図７は絶縁電線４の直径が１４．５ｍｍ（６０ｓｑ）のものに適用するスペーサ１７を示し、図８は絶縁電線４の直径が９ｍｍのものに適用するスペーサ１７′を示す。
【００２６】
上記スペーサ１７の上面１７ａ側には上記上カバー５のスペーサ取付部５ｆの取付孔５ｅを貫通する取付突起からなる取付部１７ｂを設け、また下面１７ｄ側には、内面を円弧状の接触部１７ｅとした３本のリブ１７ｇが平行して一体形成されている。該接触部１７ｅの内径は、対応する絶縁電線４の径と略同等に設定されている。したがって、このスペーサ１７を上記のスペーサ取付部５ｆに取り付けることにより、上記上カバー５側のリブにおける電線接触部１１ａ′，１１ｂ′，１１ｃ′の径より小径の電線接触部１７ｅを形成できる。
【００２７】
また、上記各リブ１７ｇには、絶縁電線４に巻き付けたバインド線３がはまる溝１７ｆが形成されており、該溝１７ｆは、絶縁カバー２を絶縁電線４にはめた場合に、そのバインド線３が絶縁カバー２の軸方向に対して傾斜して通過する方向に沿って傾斜して形成されている。
【００２８】
図８に示すスペーサ１７′は、電線接触部１７ｅ′を、上記スペーサ１７電線接触部１７ｅの半径より小さい半径部分を通る傾斜面で形成し、上記スペーサ１７に対応する絶縁電線より更に小径の絶縁電線の外周に電線接触部１７ｅ′が接触するようになっている。尚、該スペーサ１７′の他の構造は上記スペーサ１７と同様であるので、同一部分には同一符号にダッシュを付してその説明を省略する。
【００２９】
したがって、絶縁電線４が大径（１９．５ｍｍ）の場合は図１１のようにスペーサを使用せず、絶縁電線４が中径（１４．５ｍｍ）の場合は図１２のようにスペーサ１７を使用し、絶縁電線４が小径（９ｍｍ）の場合はスペーサ１７′を使用する。
【００３０】
ここで、本願実施例では絶縁電線４の径が１４．５ｍｍと９ｍｍの場合のスペーサ１７，１７′について記載してあるが、上記スペーサ１７，１７′の接触部１７ｅ，１７ｅ′の高さを絶縁電線４の径に対応させて変更したスペーサを用いることにより上記以外の径の絶縁電線４に対しても絶縁電線用放電電極装置１を取り付けることができる。
【００３１】
次に図９乃至図１１に基づき本願発明の絶縁電線用放電電極装置１を絶縁電線４に取り付ける場合について説明する。この場合はスペーサ１７，１７′を用いない場合である。
【００３２】
上記絶縁電線用放電電極装置１における上下カバー５，６を図９に示すように開いた状態において、絶縁カバー２の底面２ｄ側に設けられた貫通孔６ｇから工具（図示されていない）を差し込み、絶縁電線４に巻き付けられたバインド線３が絶縁電線４の上側の位置にある箇所において、下カバー６を絶縁電線４に対しその下側から押し当て、次で、上カバー５を閉め、上カバー５の突起５ａを下カバー６の穴６ａに嵌め合わせ、さらに下カバー６の取付ネジ貫通孔６ｂに嵌挿された取付ネジ９を上カバー５の取付ネジ孔５ｂに螺合して締め付け、絶縁カバー２を絶縁電線４に対して固定する。そして、工具（図示されていない）をはずす。この時、底面２ｄ側に設けられた接触電極部１３の放電部１５は接地電極２４に対して正確に対向する。
【００３３】
すなわち、絶縁電線４の上側を通過するバインド線３に対して上ケース５に形成した溝１２を嵌合することにより、これが位置決めとなって放電部１５が鉛直線上において下向きとなる。そして、一般にバインド線は一定のピッチで絶縁電線４に巻装されるので、図１４に示すように接地電極２４をバインド線３が絶縁電線４の上部を通る位置に設定しておくことにより、放電部１５を接地電極２４に対して正確に対向する。
【００３４】
次に、図１１に示すように、接触電極部１３を締め付けて上方へ移動させ、その先端に設けた針電極１４の先端部１４ａを絶縁電線４の被覆部４ａを破り芯線４ｂに接触させる。このとき針電極１４の先端部１４ａに嵌挿させたＯリング１６は絶縁電線４の破られた被覆部４ａと接触電極部１３の上面１３ｂとの間に密着して接触し、針電極１４等の充電部の露出を防止し、かつ雨水等が突き破られた絶縁電線４の被覆部４ａから芯線４に侵入しないようにして、絶縁電線４の芯線４ｂや針電極１４の応力腐食を防止する。
【００３５】
また、絶縁電線４の径が異なる場合には図１３に示す（ここでは絶縁電線４の径が９ｍｍの場合を示す）ように、上記したスペーサ１７′を上カバー５のスペーサ取付部５ｅに装着させてから絶縁カバー２を、上記スペーサ１７を装着していない場合と同様にして絶縁電線４に取り付ける。これにより径の小径な絶縁電線４に対しても簡単に取り付けられる。このスペーサ１７′を使用した場合の状態を図１３に示す。またスペーサ１７を使用した場合の状態を図１２に示す。
【００３６】
次に、本願発明の絶縁電線用放電電極装置１の使用状態について図１４に基づき説明する。
２０は碍子保護装置であり、高圧配電線路の電柱の腕金２１に取付固定された一般用支持碍子２２があり、その頭部の把持部２３には絶縁電線４がバインド線３により緊縛されている。上記絶縁電線４には上記の絶縁電線用放電電極装置１が上記のように付設され、その底面２ｄ側に設けられた放電部１５がギャップＧを介して接地電極２４に対向している。
【００３７】
また接地側の腕金２１には取付金具２５が設けられており、該取付金具２５には接地電極２４と内部に電圧非直線に優れた酸化亜鉛（ＺｎＯ）を主成分とする限流素子２６を備えた限流素子ユニット２７が電気的に接続されて取り付けられている。更に、取付金具２５は腕金２１に電気的に接続されているとともに腕金２１に対して回転するのを防止する回り止め金具２８が形成されている。
【００３８】
上記構成の碍子保護装置２０は、雷サ−ジが絶縁電線４を伝搬してきてその電圧が保護装置２０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、同ギャップＧにおいて閃絡が生じる。閃絡すると雷サ−ジは、絶縁電線４−接触電極部１３−放電ギヤップＧ−接地電極２４−限流素子ユニット２７−取付金具２５−腕金２１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２７があるため続流ア−クは遮断され，発生しない。したがって支持碍子２２はア−クによる偏熱破壊から防止されまた絶縁電線４はその溶損による断線が防止されることになる。
【００３９】
図１５及び図１６は上記取付金具２５を腕金２１に取り付ける場合の仮保持構造を示す。
図１５において、２５は上記の取付金具で、その基部に取付ボルト３０が挿通する取付穴２５ａが形成されている。３１は薄板状の落下防止板で、これに係止穴３２が形成されている。該係止穴３２は、その内周に、上記取付穴２５ａの内径より小さく、かつ上記取付ボルト３０のねじ山より若干大径の内径を有する係止片３３を周方向に３個突設して形成されている。そして、該落下防止板３１は、その係止穴３２を取付穴２５ａに合致させて取付金具２５の下面に当接し、ブラインドリベット３４により取付金具２５に図１６のように固着されている。
【００４０】
この取付金具２５を腕金２１に取り付ける場合には、図１４に示すナット４０及びワッシャ４１がない状態において、取付金具２５を、その落下防止板３１の係止穴３２及び取付穴２５ａを通じて取付ボルト３０に下方から挿通する。この挿通状態で限流素子ユニット２７を具備した取付金具２５から作業者の手を離すと、取付金具２５は、その自重によって図１４の右側が下るように傾斜する。これにより、係止片３３が取付ボルト３０のねじ溝に係止し、取付金具２５は落下することなく若干傾斜した状態で仮保持される。
【００４１】
その後、取付ボルト３０にワッシャ４１を挿通するとともにナット４０を螺合して取付金具２５を固定する。
以上のように取付金具２５が仮保持されるのでその取付作業が容易になる。
【００４２】
【発明の効果】
本願発明は以上の構成からなり、
針電極の先端部にＯリング又はパッキンを設けているため、接触電極部を絶縁カバーに対し締め付けるだけでＯリング又はパッキンが絶縁電線の被覆部と接触電極部の上面に密着して接触するため、簡単に針電極（充電部）を絶縁することができる。
【００４３】
また、絶縁電線の被覆部と接触電極部の上面に対して密着して接触する絶縁部材のＯリング又はパッキンを設けたため、上記絶縁カバー内に雨水が侵入した場合においても針電極（充電部）並びに針電極が突き破った絶縁電線の被覆部から雨水が侵入することはなく、同電線の芯線並びに針電極の応力腐食を防止することができる。
【００４４】
また、Ｏリング又はパッキンを針電極の先端に嵌着したため、作業の際にＯリング又はパッキンを落下させて紛失したりすることが防止できる。
また、従来の絶縁コンパウンドを使用していたものに比べて、本願発明では上記のごとくＯリング又はパッキンを使用しているため、構造が簡単となり、またコストを下げることができる。
【００４５】
また、絶縁カバーの内面又はスペーサにバインド線をはめる溝を形成したため、放電電極装置はバインド線を絶縁カバー若しくはスペーサの溝にあわせて取り付けるのみで、放電電極装置の接触電極部の放電部が接地電極と正確に対向する位置に設けることができるため作業性が向上する。
【００４６】
また、絶縁カバーと絶縁電線の間に同電線の径に対応させてスペーサを分離可能に装着することにより、径の異なる絶縁電線においても、上記の効果を発揮して絶縁カバーを共用化することができ、コストが低減される。
【００４７】
更に従来のような粘着性の絶縁コンパウドを使用しないので、放電電極装置の交換作業が容易になる。
【図面の簡単な説明】
【図１】本願発明の絶縁電線用放電電極装置の絶縁カバーを開いた状態の斜視図。
【図２】本願発明の絶縁電線用放電電極装置の絶縁カバーを開いた状態の平面図。
【図３】本願発明の絶縁電線用放電電極装置の絶縁カバーを開いた状態の側面図。
【図４】ストッパーの斜視図。
【図５】接触電極部の断面図。
【図６】Ｏリングの斜視図。
【図７】絶縁電線の径が１４．５ｍｍの場合に使用するスペーサを示すもので、（ａ）は平面図、（ｂ）は側面図、（ｃ）は底面図。
【図８】絶縁電線の径が９ｍｍの場合に使用するスペーサを示すもので、（ａ）は平面図、（ｂ）は側面図、（ｃ）は底面図。
【図９】絶縁電線に本願発明の絶縁電線用放電電極装置を取り付ける寸前の断面図。
【図１０】上カバーにスペーサを取り付けようとしている状態の斜視図。
【図１１】絶縁電線に本願発明の絶縁電線用放電電極装置を取り付けた状態の端面図。
【図１２】径が１４．５ｍｍの絶縁電線にスペーサを介して本願発明の絶縁電線用放電電極装置を取り付けた状態の断面図。
【図１３】径が９ｍｍの絶縁電線にスペーサを介して本願発明の絶縁電線用放電電極装置を取り付けた状態の断面図。
【図１４】本願発明の絶縁電線用放電電極装置の使用状態を示す図。
【図１５】取付金具とその落下防止板の分離した斜視図。
【図１６】取付金具に落下防止板を取り付けた斜視図。
【図１７】従来の放電電極装置を用いた碍子保護装置の側面図。
【図１８】従来の放電電極装置の断面図。
【符号の説明】
１絶縁電線用放電電極装置
２絶縁カバー
３バインド線
４絶縁電線
４ａ被覆部
４ｂ芯線
５上カバー
６下カバー
６ｄネジ孔
１１ａ，１１ｂ，１１ｃリブ
１２溝
１３接触電極部
１３ｂ上面
１４針電極
１４ａ先端部
１５放電部
１６Ｏリング
１７，１７′ スペーサ
１７ｅ，１７ｅ′ スペーサの接触部
１７ｆ，１７ｆ′ バインド線を嵌める溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulator protection device which is used by supporting an insulated wire of a high-voltage distribution line by binding a binding wire to a grasping portion of a head portion of the support insulator in the vicinity of or attached to the support insulator. This relates to the improvement of the discharge electrode device.
[0002]
[Prior art]
In a high-voltage distribution line using an insulated wire, an insulator protection device 100 is attached in the vicinity of the support insulator 107 as shown in FIG. Generally, the insulator protection device 100 has a configuration in which a current limiting element unit 103 and a ground electrode 104 are provided on a mounting bracket 102 attached to the bottom surface side of a support insulator 107, and a discharge electrode device 106 is provided on an insulated wire 105. The insulator 107 is protected by discharging an abnormal voltage such as a lightning surge that has propagated to the ground electrode 104 from the discharge electrode device 106 to the ground through the brace 101. During this discharge, the continuity of the commercial frequency is cut off by the current limiting element unit 103 interposed in the discharge path.
[0003]
As shown in FIG. 18, the discharge electrode device 106 has the insulating cover 108 attached to the outer periphery of the insulated wire 105 on the entire inner surface of the insulating cover 108 via an insulating compound 109 of a semi-fluid insulating material, The tip end portion 111a of the needle electrode 111 provided on the contact electrode portion 110 attached to the insulating cover 108 is penetrated through the covering portion 105a of the insulated wire 105 and brought into contact with the core wire 105b.
[0004]
[Problems to be solved by the invention]
By the way, the above-described conventional discharge electrode device 106 prevents the exposed portion of the charged portion such as the needle electrode 111 from being exposed, and covers the insulated wire 105 pierced by the needle electrode 111 of the contact electrode portion 110 fixed to the insulating cover 108. Since a semi-fluid insulating material such as adhesive butyl rubber is used for the insulating compound 109 for preventing rainwater from entering the core wire 105b from the portion 105a, once the discharge electrode device 106 is attached, the discharge is caused by changing the attachment position, etc. When the electrode device 106 is removed, the removal operation cannot be easily performed due to its high adhesiveness, and there is a problem that it becomes difficult to reuse the discharge electrode device 106 depending on the removal method.
[0005]
Further, in the conventional discharge electrode device 106, when the discharge electrode device 106 is attached to the insulated wire 105, the insulation compound 109, the insulated wire 105, and the insulation cover 108 are in close contact with each other due to the difference in diameter of the insulated wire 105. Since the degree of difference occurs, it is necessary to prepare and operate a discharge electrode device 106 of a type corresponding to the diameter of the insulated wire 105, and there is a problem that the cost is high and workability is poor.
[0006]
Further, since the conventional discharge electrode device 106 is difficult to position (adjust) the contact electrode portion 110b of the contact electrode portion 110 to face the ground electrode 104, that is, to coincide with the circumferential direction, There is a problem that the device 106 is inclined in the circumferential direction, and the discharge portion 111b of the contact electrode 110 does not face the ground electrode 104 accurately, and the discharge start voltage is not constant.
[0007]
Further, since the insulating compound 109 is provided on the entire inner surface of the insulating cover 108 so as to be in close contact with the outer peripheral surface of the insulated wire 105, a large amount of insulating compound is required, and the cost is increased accordingly. It was.
[0008]
[Means for solving problems]
The present invention is for solving the above problems,
The first invention comprises an insulating cover (2) attached to the outer peripheral surface of an insulated wire (4) wound with a bind wire (3), and a screw hole (6d) formed in the insulating cover (2). The contact electrode portion (13) screwed into the screw hole (6d) and the tip portion (14a) formed into a needle shape by tightening the screw of the contact electrode portion (13) are formed on the insulated wire (4). In the discharge electrode device for insulated wires provided with the needle electrode (14) in contact with the core wire (4b),
The inner surface (5c) of the insulating cover (2) is provided with a groove (12) in which the bind wire (3) is fitted ,
Furthermore, a spacer (17) (17 ') is detachably provided in the insulating cover (2), and the spacer (17) (17') is in contact with the outer periphery of the insulated wire (4) having a corresponding diameter. A groove (17f) (17f ') into which the part (17e) (17e') and the bind wire (3) wound around the insulated wire (4) fit is formed .
[0009]
In the second invention, an insulating cover (2) to be attached to the outer peripheral surface of an insulated wire (4) wound with a bind wire (3), and a screw hole (6d) are formed in the insulating cover (2). The contact electrode portion (13) screwed into the screw hole (6d) and the tip portion (14a) formed into a needle shape by tightening the screw of the contact electrode portion (13) are formed on the insulated wire (4). In the discharge electrode device for insulated wires provided with the needle electrode (14) in contact with the core wire (4b),
The inner surface (5c) of the insulating cover (2) is provided with a groove (12) in which the bind wire (3) is fitted,
Furthermore, a spacer (17) (17 ') is detachably provided in the insulating cover (2), and the spacer (17) (17') is in contact with the outer periphery of the insulated wire (4) having a corresponding diameter. Forming a groove (17f) (17f ') in which the part (17e) (17e') and the bind wire (3) wound around the insulated wire (4) are fitted;
Furthermore, when the needle electrode (14) is brought into contact with the core wire (4b) of the insulated wire (4) at the tip end portion (14a) of the needle electrode (14), the covered portion (4a) of the insulated wire (4) And an O-ring or packing (16) that is in close contact with the upper surface (13b) of the contact electrode portion (13).
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on the embodiments shown in FIGS.
[0012]
DESCRIPTION OF SYMBOLS 1 is the discharge electrode apparatus for insulated wires of this invention, 2 is EVA (ethylene vinyl alcohol) excellent in the weather resistance etc. which are attached so that the outer peripheral surface may be covered with respect to the insulated wire 4 which wound the bind wire 3 An insulating cover made of a synthetic resin such as a resin. The cover 2 is formed in a cylindrical shape and is divided into two parts by an upper cover 5 and a lower cover 6, and the upper and lower covers 5 and 6 are connected to each other by a hinge 7 so as to be opened and closed. Further, a square-shaped protrusion 5a is integrally formed inward on the piece 2b on the upper cover 5 opposite to the hinge 7, and the protrusion 5a on the piece 2b 'on the lower cover 6 opposite to the hinge 7 is integrally formed. Is formed integrally, and when the upper and lower covers 5, 6 are closed, the projection 5a is fitted into the hole 6a, and the claw portion 5a 'formed in the projection 5a is formed in the hole 6a. The upper and lower covers 5 and 6 are held in a closed state.
[0013]
2c is a shielding plate integrally formed at both ends of the upper and lower covers 5 and 6, is formed of a thin plate that can be bent, and when the upper and lower covers 5 and 6 are closed and fixed to the insulated wire 4, Cuts (slits) are formed so as to spread easily according to the diameter.
[0014]
A mounting screw hole 5b is formed at the center of the piece 2b on the upper cover 5 where the projection 5a is provided, and a mounting screw is passed through the center of the piece 2b 'where the hole 6a is formed on the lower cover 6. A hole 6b is formed. When the upper and lower covers 5 and 6 are closed, a mounting screw 9 made of synthetic resin such as EVA resin is inserted into the through hole 6b from the bottom surface 2d side of the insulating cover 2, and the screw portion is inserted. The upper and lower covers 5 and 6 are not opened by screwing into the mounting screw holes 5b. The mounting screw 9 is fitted in the mounting screw through-hole 6b of the lower cover 6, and the distal end portion 9a of the mounting screw 9 has an outer diameter as shown in FIGS. A stopper 10 that is larger in diameter than the diameter of 6 b and has an inner diameter closely attached to the outer peripheral surface of the mounting screw 9 and has a thin wall thickness is inserted and held so that the mounting screw 9 does not fall from the lower cover 6. The mounting screw 9 is made of a soft synthetic resin such as nylon or vinyl, rubber, or the like so as not to cause a large friction when tightened.
[0015]
On the inner surface 5c side of the upper cover 5 and on both sides, a plurality of fan-shaped electric wire contact portions 11a ', 11b', 11c 'that are concentric with the upper cover 5 and have a small radius (three in the embodiment) ) Ribs 11a, 11b, and 11c are formed integrally with the cover 5 in parallel. The ribs 11a, 11b, and 11c have arcuate inner surfaces that are in contact with the outer periphery of the insulated wire 4 having a diameter of, for example, 19.5 mm (150 sq) when the upper and lower covers 5 and 6 are closed. .
[0016]
The end surfaces 11a ", 11b", 11c "of the three ribs 11a, 11b, 11c on the side through which the bind wire 3 of the insulated wire 4 passes are inclined as shown in FIG. 2, that is, as shown in FIG. 2, the circumferential length is gradually shortened from the outer rib 11 c to the inner rib 11 a.
[0017]
Further, as shown in FIG. 2, such ribs 11 a, 11 b, and 11 c are provided point-symmetrically around the center of the upper cover 5 on the inner surfaces of both ends of the upper cover 5.
[0018]
Then, as shown in FIG. 2, a groove 12 for fitting the bind wire 3 wound around the insulated wire 4 is formed by the end faces 11a ″, 11b ″, 11c ″ of the ribs 11a, 11b, 11c on both sides. When the insulating cover 2 is attached to the insulated wire 4, the bind wire 3 is fitted into the groove 12 so that the bind wire 3 hits the end faces 11a ", 11b", 11c "and the insulating cover 2 is positioned in the circumferential direction with respect to the insulated wire 4. The discharge part 15 of the contact electrode part 13 to be described later faces the ground electrode 24 accurately.
[0019]
Further, the inner surface portion of the upper cover 5 between the ribs 11a, 11a formed on the both side portions serves as a mounting space, and this portion constitutes a mounting portion 5f of the spacer 17 described later. The mounting portion 5f is formed with mounting holes 5e penetrating the inner surface 5c and the outer surface 5d of the upper cover 5.
[0020]
A convex portion 6e is formed at the center of the bottom portion of the lower cover 6 and is engraved by penetrating a screw hole 6d for screwing a contact electrode portion 13 to be described later inward and outward. Further, through holes 6g for inserting a tool (not shown) when the insulating cover 2 is attached to the insulated wire 4 are formed on both ends 6f of the bottom surface 6c. The through hole 6g is used as a drain hole for discharging rainwater or the like that has entered the insulating cover 2 after the insulating cover 2 is attached to the insulated wire 4.
[0021]
Reference numeral 13 denotes a contact electrode portion. As shown in FIG. 5, a needle electrode 14 made of a metal such as stainless steel or brass, and an outer peripheral surface excluding the tip end portion 14a of the needle electrode 14 are formed and a discharge hole 13f is formed. In addition, a male screw 13a is engraved on the side surface, and a hexagonal nut portion 13c is integrally formed on the lower portion, and a synthetic resin screw portion 13d is formed. The male screw portion 13a formed on the outer peripheral surface of the contact electrode portion 13 is tightened from below to the screw hole 6d formed in the convex portion 6e of the lower cover 6 so as to be in a state as shown in FIG. .
[0022]
The bottom surface 14 b of the discharge hole 13 f faces the ground electrode 24 when the insulating cover 2 is attached to the insulated wire 4, and the discharge portion 15 for discharging the abnormal voltage generated in the insulated wire 4 to the ground electrode 24. It has become.
[0023]
Reference numeral 16 denotes an O-ring having a shape as shown in FIG. 6, which is formed of an insulating member such as rubber or soft synthetic resin. As shown in FIG. 9, the O-ring is inserted into the distal end portion 14 a of the needle electrode 14. If necessary, it is fastened and held with an adhesive or an adhesive.
[0024]
In this embodiment, the O-ring 16 is illustrated, but instead of the O-ring 16, a packing that is in close contact with the covering portion 4 a of the insulated wire 4 and the upper surface 13 b of the contact electrode portion 13 is used. Also good. Further, in order to further improve the waterproofness of the O-ring 16 or the packing, if a sealant such as grease is applied in advance in the hole of the O-ring 16 or the packing or the tip end portion 14a of the needle electrode 14, the waterproofness is further improved. Can be a thing.
[0025]
Reference numerals 17 and 17 'denote spacers which are formed of the same synthetic resin such as EVA resin as the insulating cover 2, and the outer peripheral shape thereof is formed so as to be separably mounted on the spacer mounting portion 5f of the upper cover 5. FIG. 7 shows a spacer 17 applied to an insulated wire 4 having a diameter of 14.5 mm (60 sq), and FIG. 8 shows a spacer 17 'applied to an insulated wire 4 having a diameter of 9 mm.
[0026]
A mounting portion 17b made of a mounting projection penetrating the mounting hole 5e of the spacer mounting portion 5f of the upper cover 5 is provided on the upper surface 17a side of the spacer 17, and an inner surface of the spacer 17 has an arcuate contact portion 17e. These three ribs 17g are integrally formed in parallel. The inner diameter of the contact portion 17e is set substantially equal to the diameter of the corresponding insulated wire 4. Therefore, by attaching the spacer 17 to the spacer attachment portion 5f, the wire contact portion 17e having a diameter smaller than the diameter of the wire contact portions 11a ', 11b', 11c 'in the rib on the upper cover 5 side can be formed.
[0027]
Each rib 17g is formed with a groove 17f into which the bind wire 3 wound around the insulated wire 4 is fitted. When the insulating cover 2 is fitted onto the insulated wire 4, the groove 17f is formed with the bind wire 3f. Is formed so as to be inclined along the direction of passing through the insulating cover 2 while being inclined with respect to the axial direction.
[0028]
In the spacer 17 'shown in FIG. 8, the electric wire contact portion 17e' is formed by an inclined surface that passes through a radius portion smaller than the radius of the spacer 17 electric wire contact portion 17e, and is insulated with a smaller diameter than the insulated electric wire corresponding to the spacer 17. The electric wire contact portion 17e 'comes into contact with the outer periphery of the electric wire. Since the other structure of the spacer 17 'is the same as that of the spacer 17, the same portions are given the same reference numerals with a dash, and the description thereof is omitted.
[0029]
Therefore, when the insulated wire 4 has a large diameter (19.5 mm), a spacer is not used as shown in FIG. 11, and when the insulated wire 4 has a medium diameter (14.5 mm), a spacer 17 is used as shown in FIG. If the insulated wire 4 has a small diameter (9 mm), a spacer 17 'is used.
[0030]
Here, in the present embodiment, the spacers 17 and 17 'when the diameter of the insulated wire 4 is 14.5 mm and 9 mm are described, but the height of the contact portions 17e and 17e' of the spacers 17 and 17 'is described. By using the spacer changed corresponding to the diameter of the insulated wire 4, the insulated wire discharge electrode device 1 can be attached to the insulated wire 4 having a diameter other than the above.
[0031]
Next, the case where the insulated wire discharge electrode device 1 of the present invention is attached to the insulated wire 4 will be described with reference to FIGS. 9 to 11. In this case, the spacers 17 and 17 'are not used.
[0032]
With the upper and lower covers 5 and 6 in the insulated electrode discharge electrode device 1 opened as shown in FIG. 9, a tool (not shown) is inserted from the through hole 6g provided on the bottom surface 2d side of the insulating cover 2. At the place where the bind wire 3 wound around the insulated wire 4 is located at the upper position of the insulated wire 4, the lower cover 6 is pressed against the insulated wire 4 from the lower side, and then the upper cover 5 is closed, The protrusion 5a of the cover 5 is fitted into the hole 6a of the lower cover 6, and the mounting screw 9 inserted into the mounting screw through hole 6b of the lower cover 6 is screwed into the mounting screw hole 5b of the upper cover 5 and tightened. The insulating cover 2 is fixed to the insulated wire 4. Then remove the tool (not shown). At this time, the discharge portion 15 of the contact electrode portion 13 provided on the bottom surface 2d side accurately faces the ground electrode 24.
[0033]
That is, when the groove 12 formed in the upper case 5 is fitted to the bind wire 3 passing above the insulated wire 4, this becomes a positioning and the discharge part 15 faces downward on the vertical line. And since the bind wire is generally wound around the insulated wire 4 at a constant pitch, by setting the ground electrode 24 at a position where the bind wire 3 passes through the upper portion of the insulated wire 4 as shown in FIG. The discharge unit 15 is accurately opposed to the ground electrode 24.
[0034]
Next, as shown in FIG. 11, the contact electrode portion 13 is tightened and moved upward, and the tip portion 14a of the needle electrode 14 provided at the tip thereof is brought into contact with the core wire 4b by breaking the covering portion 4a of the insulated wire 4. At this time, the O-ring 16 inserted into the distal end portion 14a of the needle electrode 14 is in close contact with the torn portion 4a of the insulated wire 4 and the upper surface 13b of the contact electrode portion 13 so that the needle electrode 14 and the like are in contact. The exposed portion of the insulated wire 4 is prevented from being exposed, and the core wire 4b of the insulated wire 4 and the needle electrode 14 are prevented from stress corrosion by preventing the rain wire from entering the core wire 4 from the covered portion 4a of the insulated wire 4. .
[0035]
If the diameter of the insulated wire 4 is different, the spacer 17 'is mounted on the spacer mounting portion 5e of the upper cover 5 as shown in FIG. 13 (in this case, the diameter of the insulated wire 4 is 9 mm). Then, the insulating cover 2 is attached to the insulated wire 4 in the same manner as when the spacer 17 is not attached. Thereby, it can be easily attached to the insulated wire 4 having a small diameter. FIG. 13 shows a state in which this spacer 17 ′ is used. FIG. 12 shows a state where the spacer 17 is used.
[0036]
Next, the use state of the insulated wire discharge electrode device 1 of the present invention will be described with reference to FIG.
Reference numeral 20 denotes an insulator protection device, which has a general support insulator 22 attached and fixed to a brace 21 of a power pole of a high-voltage distribution line. An insulated wire 4 is bound to a grip portion 23 of the head by a bind wire 3. Yes. The insulated wire 4 is provided with the insulated wire discharge electrode device 1 as described above, and the discharge portion 15 provided on the bottom surface 2d side faces the ground electrode 24 with the gap G interposed therebetween.
[0037]
Further, the armature 21 on the ground side is provided with a mounting bracket 25. The mounting bracket 25 has a grounding electrode 24 and a current limiting element 26 mainly composed of zinc oxide (ZnO) having excellent voltage non-linearity inside. A current-limiting element unit 27 having an electrical connection is electrically connected and attached. Further, the mounting bracket 25 is electrically connected to the arm bracket 21 and is formed with a rotation stopper 28 that prevents the mounting bracket 25 from rotating with respect to the arm bracket 21.
[0038]
When the lightning surge propagates through the insulated wire 4 and the voltage is equal to or higher than the discharge start voltage of the protection device 20, the overvoltage is applied between the discharge gaps G, and A flashover occurs. When the flashing occurs, the lightning surge is discharged to the ground through the discharge path of the insulated wire 4 -contact electrode portion 13 -discharge gap G -ground electrode 24 -current limiting element unit 27 -mounting bracket 25 -arm metal 21. At this time, since the discharge gap G and the current limiting element unit 27 are present in the discharge path, the continuation arc is cut off and does not occur. Therefore, the support insulator 22 is prevented from thermal destruction due to arc, and the insulated wire 4 is prevented from being disconnected due to melting.
[0039]
15 and 16 show a temporary holding structure when the mounting bracket 25 is attached to the arm metal 21. FIG.
In FIG. 15, reference numeral 25 denotes the above-described mounting bracket, and a mounting hole 25 a through which the mounting bolt 30 is inserted is formed at the base thereof. Reference numeral 31 denotes a thin plate-like fall prevention plate, in which a locking hole 32 is formed. The locking hole 32 has three locking pieces 33 protruding in the circumferential direction on the inner periphery thereof, which are smaller than the inner diameter of the mounting hole 25a and have an inner diameter slightly larger than the thread of the mounting bolt 30. Is formed. The fall prevention plate 31 is brought into contact with the lower surface of the mounting bracket 25 with its locking hole 32 aligned with the mounting hole 25a, and is fixed to the mounting bracket 25 with a blind rivet 34 as shown in FIG.
[0040]
When the mounting bracket 25 is attached to the arm metal 21, the mounting bracket 25 is attached to the mounting bolt 25 through the locking hole 32 and the mounting hole 25a of the fall prevention plate 31 without the nut 40 and the washer 41 shown in FIG. 30 is inserted from below. When the operator's hand is released from the mounting bracket 25 provided with the current limiting element unit 27 in this inserted state, the mounting bracket 25 is inclined so that the right side of FIG. Thereby, the locking piece 33 is locked in the thread groove of the mounting bolt 30, and the mounting bracket 25 is temporarily held in a slightly inclined state without falling.
[0041]
Thereafter, the washer 41 is inserted into the mounting bolt 30 and the nut 40 is screwed to fix the mounting bracket 25.
Since the mounting bracket 25 is temporarily held as described above, the mounting operation is facilitated.
[0042]
【The invention's effect】
The present invention comprises the above configuration,
Since the O-ring or packing is provided at the tip of the needle electrode, the O-ring or packing is in intimate contact with the top surface of the contact electrode portion and the insulation wire cover simply by tightening the contact electrode portion against the insulating cover. The needle electrode (charging part) can be easily insulated.
[0043]
In addition, since an O-ring or packing of an insulating member that is in close contact with the upper surface of the covering portion of the insulated wire and the contact electrode portion is provided, even when rainwater enters the insulating cover, the needle electrode (charging portion) In addition, rainwater does not enter from the covered portion of the insulated wire through which the needle electrode has broken, and stress corrosion of the core wire and needle electrode of the wire can be prevented.
[0044]
Further, since the O-ring or packing is fitted to the tip of the needle electrode, it is possible to prevent the O-ring or packing from being dropped and lost during work.
In addition, as compared with the case where a conventional insulating compound is used, the present invention uses an O-ring or packing as described above, so that the structure is simplified and the cost can be reduced.
[0045]
In addition, since the groove for fitting the bind wire to the inner surface of the insulating cover or the spacer is formed, the discharge electrode device is simply attached to the insulating cover or the groove of the spacer, and the discharge portion of the contact electrode portion of the discharge electrode device is grounded. Since it can be provided at a position accurately facing the electrode, workability is improved.
[0046]
In addition, by installing a spacer in a separable manner between the insulating cover and the insulated wire so as to correspond to the diameter of the same wire, the insulating cover can be used in common even for insulated wires with different diameters. And the cost is reduced.
[0047]
Furthermore, since the conventional adhesive insulating compound is not used, the replacement work of the discharge electrode device is facilitated.
[Brief description of the drawings]
FIG. 1 is a perspective view of an insulated wire discharge electrode device according to the present invention with an insulating cover opened.
FIG. 2 is a plan view showing a state in which an insulating cover of the discharge electrode device for insulated wires according to the present invention is opened.
FIG. 3 is a side view of the discharge electrode device for insulated wires according to the present invention in a state where an insulating cover is opened.
FIG. 4 is a perspective view of a stopper.
FIG. 5 is a cross-sectional view of a contact electrode portion.
FIG. 6 is a perspective view of an O-ring.
FIGS. 7A and 7B show spacers used when the diameter of an insulated wire is 14.5 mm. FIG. 7A is a plan view, FIG. 7B is a side view, and FIG.
FIGS. 8A and 8B show spacers used when the diameter of an insulated wire is 9 mm. FIG. 8A is a plan view, FIG. 8B is a side view, and FIG. 8C is a bottom view.
FIG. 9 is a cross-sectional view just before attaching the insulated wire discharge electrode device of the present invention to the insulated wire.
FIG. 10 is a perspective view of a state in which a spacer is about to be attached to the upper cover.
FIG. 11 is an end view of the insulated wire with the insulated electrode discharge electrode device of the present invention attached thereto.
FIG. 12 is a cross-sectional view showing a state where the insulated wire discharge electrode device of the present invention is attached to an insulated wire having a diameter of 14.5 mm via a spacer.
FIG. 13 is a cross-sectional view of a state in which the insulated wire discharge electrode device of the present invention is attached to an insulated wire having a diameter of 9 mm via a spacer.
FIG. 14 is a diagram showing a usage state of the discharge electrode device for insulated wires of the present invention.
FIG. 15 is a perspective view of the mounting bracket and its fall prevention plate separated from each other.
FIG. 16 is a perspective view in which a fall prevention plate is attached to the mounting bracket.
FIG. 17 is a side view of an insulator protecting device using a conventional discharge electrode device.
FIG. 18 is a cross-sectional view of a conventional discharge electrode device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Discharge electrode apparatus 2 for insulated wires Insulation cover 3 Binding wire 4 Insulated wire 4a Covering part 4b Core wire 5 Upper cover 6 Lower cover 6d Screw hole 11a, 11b, 11c Rib 12 Groove 13 Contact electrode part 13b Upper surface 14 Needle electrode 14a Tip part 15 Discharge part 16 O-ring 17, 17 'Spacer 17e, 17e' Spacer contact part 17f, 17f 'Groove for fitting the bind wire

Claims

An insulating cover (2) to be attached to the outer peripheral surface of the insulated wire (4) around which the bind wire (3) is wound, and a screw hole (6d) is formed in the insulating cover (2) to form the screw hole (6d). ) And the tip portion (14a) formed into a needle shape by tightening the screw with the contact electrode portion (13) is in contact with the core wire (4b) of the insulated wire (4). In the discharge electrode device for insulated wires provided with the needle electrode (14)
The inner surface (5c) of the insulating cover (2) is provided with a groove (12) in which the bind wire (3) is fitted ,
Furthermore, a spacer (17) (17 ') is detachably provided in the insulating cover (2), and the spacer (17) (17') is in contact with the outer periphery of the insulated wire (4) having a corresponding diameter. Discharge electrode device for insulated wires , characterized in that grooves (17f) (17f ') are formed in which portions (17e) (17e') and bind wires (3) wound around insulated wires (4) are fitted .

An insulating cover (2) to be attached to the outer peripheral surface of the insulated wire (4) around which the bind wire (3) is wound, and a screw hole (6d) is formed in the insulating cover (2) to form the screw hole (6d). ) And the tip portion (14a) formed into a needle shape by tightening the screw with the contact electrode portion (13) is in contact with the core wire (4b) of the insulated wire (4). In the discharge electrode device for insulated wires provided with the needle electrode (14)
The inner surface (5c) of the insulating cover (2) is provided with a groove (12) in which the bind wire (3) is fitted,
Furthermore, a spacer (17) (17 ') is detachably provided in the insulating cover (2), and the spacer (17) (17') is in contact with the outer periphery of the insulated wire (4) having a corresponding diameter. Forming a groove (17f) (17f ') in which the part (17e) (17e') and the bind wire (3) wound around the insulated wire (4) are fitted;
Furthermore, when the needle electrode (14) is brought into contact with the core wire (4b) of the insulated wire (4) at the tip end portion (14a) of the needle electrode (14), the covered portion (4a) of the insulated wire (4) A discharge electrode device for an insulated wire, wherein an O-ring or packing (16) that is in close contact with the upper surface (13b) of the contact electrode portion (13) is fitted.