JP4050916B2

JP4050916B2 - Lightning arrestor

Info

Publication number: JP4050916B2
Application number: JP2002071118A
Authority: JP
Inventors: 誠山口; 宏樹楫野
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-03-15
Filing date: 2002-03-15
Publication date: 2008-02-20
Anticipated expiration: 2022-03-15
Also published as: JP2003272908A

Description

【０００１】
【発明の属する技術分野】
この発明は、電力系統に接続された電気機器を回路に発生する開閉サージ、雷サージ等の異常電圧から保護する複数の酸化亜鉛素子を積層し、外周部にシリコンゴムまたはポリマー等の絶縁材料の外被を被せた避雷器に関するものである。
【０００２】
【従来の技術】
複数の酸化亜鉛素子を積層し、外周部にシリコンゴムまたはポリマー等の絶縁材料の外被を被せた避雷器としては、例えば特開平６−３１０３０７号公報に開示されたものがある。その構成を図６に示す。図６（ａ）は全体構成図、図６（ｂ）は酸化亜鉛素子モジュールの構成図、図６（ｃ）は上部電極部の平面図である。図において、１は複数の酸化亜鉛素子１ａが積層された酸化亜鉛素子ブロック、２は周囲にフランジ２ａを備え、フランジ２ａ部には複数のボルト穴が設けられた上部電極、３は周囲にフランジ３ａを備え、フランジ３ａ部には複数のボルト穴が設けられた下部電極、４は酸化亜鉛素子ブロック１の両端部に配置された上部電極２と下部電極３の間を締め付ける絶縁ロッド、５は絶縁ロッド４の両端部のナット、８は１〜５で構成された酸化亜鉛素子モジュールである。９は酸化亜鉛素子モジュール８の外周を覆うシリコンゴムまたは他のポリマー等の絶縁材料によりひだを有する形状に形成された外被である。
【０００３】
このように構成したことにより、積層された酸化亜鉛素子ブロック１が絶縁ロッド４により強固に締め付けられて機械的強度が確保され、外被９を耐候性、耐トラッキング性に優れた絶縁材料にて形成することにより、耐候性に優れた小形軽量の屋外用避雷器が得られるものである。
【０００４】
【発明が解決しようとする課題】
上記のように構成された避雷器は、外周に配置された絶縁ロッド４により酸化亜鉛素子ブロック１に押圧力を加えて酸化亜鉛素子１ａの接触部に接触圧力を与え、機械的強度が確保される構成であり、酸化亜鉛素子ブロック１の積層高さを高くすると、使用時に加わる曲げ荷重に耐えず、積層状態が崩れてしまうので、積層高さが高くなる高電圧用には適用できない問題点があった。
【０００５】
この発明は上記問題点を解決するためになされたものであり、酸化亜鉛素子の積層高さを高くしても、積層状態が崩れない構成とし、高電圧用が１つの酸化亜鉛素子モジュールで構成できる避雷器を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
この発明の請求項１に係る避雷器は、複数の酸化亜鉛素子が積層された酸化亜鉛素子ブロックを絶縁筒内に収容し、両端部に第１の電極および第２の電極を配置し、絶縁筒外周部に耐候性を備えた絶縁材料によりひだを有する形状に外被を被せた避雷器において、絶縁筒の両端部それぞれに直角方向に貫通する長円形の係止穴を設け、第１の電極は、円板部とこの円板部外周の対向する位置で周方向に突出する一対の係止部と、円板部の一面側の軸方向に突出する接続部とを有し、接続部中心の軸方向に貫通するねじ穴を設け、第２の電極は、円板部とこの円板部の一面側の軸方向に突出する接続部とを有し、接続部の軸方向に対し直角方向に貫通する係止穴を設けた形状に形成し、第１の電極と酸化亜鉛素子ブロックの間に、円板状に形成し、厚さ方向に変位させることにより押圧力が発生する円板状ばね部材の加圧部材を配置し、酸化亜鉛素子ブロックを絶縁筒内に挿入し、第２の電極を絶縁筒の他端内径部に配置し、絶縁筒の他端側係止穴と第２の電極の係止穴に第２の電極を係止する係止棒を挿入し、第１の電極のねじ穴に押圧ねじを螺合して締め付けることにより、加圧部材を介して酸化亜鉛素子ブロックに適正圧力を与える構成としたものである。
【０００７】
この発明の請求項２に係る避雷器は、請求項１の構成の絶縁筒の両端部に設けた係止穴の第１の電極および第２の電極の係止部が当接する係止面は、円弧状に形成し、第１の電極の係止部の係止面および第２の電極側に挿入する係止棒の係止面の形状は、絶縁筒の係止穴の係止面の内面に沿う円弧状に形成したものである。
【０００８】
この発明の請求項３に係る避雷器は、複数の酸化亜鉛素子が積層された酸化亜鉛素子ブロックを絶縁筒内に収容し、両端部に第１の電極および第２の電極を配置し、絶縁筒外周部に耐候性を備えた絶縁材料によりひだを有する形状に外被を被せた避雷器において、
絶縁筒は両端側内径部の上記第１の電極および第２に電極が配置される位置に係止溝を設け、第１の電極は、円板部とこの円板部の一面側の軸方向に突出する接続部を有し、円板部の外周の接続部側の角部を円錐状に形成し、接続部の軸方向に貫通するねじ穴を設け、第２の電極は、円板部とこの円板部の一面側の軸方向に突出する接続部を有し、円板部の外周の接続部側の角部を円錐状に形成し、接続部中心位置に接続用ねじ穴を設け、第１の電極は、絶縁筒の係止溝の位置に挿入し、オープンリング状の止め輪を絶縁筒の係止溝に装着し、第１の電極側に加圧部材を配置し、酸化亜鉛素子ブロックを絶縁筒内に配置し、第２の電極を絶縁筒の他端側内径部に配置し、第１の電極部と同一のオープンリング状の止め輪を絶縁筒の係止溝に装着し、第 1 の電極のねじ穴に押圧ねじを螺合して締め付けることにより加圧部材を介して酸化亜鉛素子ブロックに適正圧力を与える構成としたものである。
【０００９】
この発明の請求項４に係る避雷器は、請求項３の構成の絶縁筒の両端の内周に係止溝を設けた外周に補強リングを配設したものである。
【００１０】
【発明の実施の形態】
実施の形態１．
実施の形態１の避雷器の構成を図１に示す。図２は図１の酸化亜鉛素子モジュール部分の構成であり、図２（ａ）は酸化亜鉛素子ブロックの積層する各部材の配列状態を示す斜視図、図２（ｂ）は絶縁筒の斜視図である。図において、１１は複数の酸化亜鉛素子１１ａが積層された酸化亜鉛素子ブロック、１２は酸化亜鉛素子ブロック１１の端面の全面に接触させる円板、２０は酸化亜鉛素子ブロック１１が収容される絶縁筒であり、両端部に一対の電極を係止する係止穴２０ａが設けられている。１２ａは酸化亜鉛素子ブロック１１の積層高さを所定の高さに調整するスペーサである。１３は酸化亜鉛素子ブロックの両側に配置された一対の電極の一方の第１の電極であり、円板部１３ａの一面の中心部に接続部１３ｃ、外周部の対向する両側に係止部１３ｂが設けられ、中心部を貫通するねじ穴１３ｄが設けられている。１４は酸化亜鉛素子ブロック１１に押圧力を与える皿ばねで構成された加圧部材である。１５は加圧部材１４を押圧する押え板、１６は押え板１５を押圧する押圧ねじであり、頭なし六角穴付止めねじが適当である。
【００１１】
１７は一対の電極の他方の第２の電極であり、円板部１７ａの一面の中心部に接続部１７ｂが設けられ、中心部に接続用のねじ穴１７ｃが設けられている。１８は第２の電極１７を絶縁筒２０に係止する係止棒である。第１の電極１３の係止部１３ｂ、および係止棒１８の絶縁筒２０の係止穴２０ａに接する部分の形状は円弧状に形成されている。１０は酸化亜鉛素子ブロック１１、円板１２、第１の電極１３、加圧部材１４、押え板１５、押圧ねじ１６、第２の電極１７が絶縁筒２０に収容された構成の酸化亜鉛素子モジュールである。２２は酸化亜鉛素子モジュール１０の外周部に被せられた外被であり、耐候性を備えた絶縁材料によりひだを有する形状に形成されている。
【００１２】
図１の組立手順は、まず、第１の電極１３の係止部１３ｂを絶縁筒２０の係止穴２０ａの部分に装着し、酸化亜鉛素子ブロック１１を積層高さが所定の高さになるようにスペーサ１２により調整して積層し、絶縁筒２０の内径部に収容する。次に酸化亜鉛素子ブロック１１の積層された端部に第２の電極１７を配置し、絶縁筒２０の係止穴２０ａに係止棒１８を差し込み、第１の電極１３のねじ穴１３ｄに押圧ねじ１６を螺合して押え板１５に押圧力を加えることで酸化亜鉛素子モジュール１０が組み立てられる。
【００１３】
組み立てられた酸化亜鉛素子モジュール１０の外周に絶縁材料によりひだを有する形状に外被２２を加圧成型により被せて組立が完了する。外被２２は加圧成型時に絶縁材料が酸化亜鉛素子ブロック１０の外周と絶縁筒２０の内面との間に浸入し、空隙のない状態に仕上がり、酸化亜鉛素子ブロック１０の外周沿面の絶縁耐力が確保される。
【００１４】
このように酸化亜鉛素子ブロック１１を絶縁筒２０内に収容したことにより、避雷器の使用中に加わる曲げ荷重に対して、酸化亜鉛素子ブロック１１の積層状態が絶縁筒２０により保持されるので、積層高さを高くしても、使用中の積層状態が崩れることがなくなり、高電圧用の例えば１１０ｋＶ級の避雷器でも一体で構成できる。
また、第１の電極１３および第２の電極１７は円板部と接続部を一体に構成し、加圧部材は平板状の皿バネを使用したことにより、電極部の高さを低くできるので、避雷器の高さを低く抑えることができる。
【００１５】
実施の形態２．
実施の形態２の避雷器の構成を図３に示す。実施の形態１では、酸化亜鉛素子ブロックの両端面に配置した一対の電極の第１の電極１３、第２の電極１７は、絶縁筒２０の端部の係止穴２０ａに係止する構成としたので、酸化亜鉛素子ブロック１１を押圧した反力は、絶縁筒２０の係止部２０ａに集中荷重として加わり、この部分が押圧力に対して耐えるように肉厚を厚くしなければならないので絶縁筒２０のコストが高くなる問題がある。この問題を解消するために、実施の形態２では酸化亜鉛素子ブロック１１の両端部に配置した一対の電極と絶縁筒の係止方法を絶縁筒の周囲に均等に分布するように構成したものである。
【００１６】
図において、酸化亜鉛素子ブロック１１、円板１２、加圧部材１４、押え板１５、押圧ねじ１６は実施の形態１の図１、図２と同一部分である。３３、３７は酸化亜鉛素子ブロック１１の両端部に配置された電極であり、３３は加圧部材１４を配置した一端側の第１の電極、３７は酸化亜鉛素子ブロック１１の他端側の第２の電極である。第１の電極３３は円板部３３ａとその一面側に円柱状の接続部３３ｂを一体に形成し、円板部３３ａの接続部３３ｂ側の外周は円錐状に面取りした形状に形成し、中心部には貫通したねじ穴３３ｃが設けられている。第２の電極３７は円板部３７ａとその一面側に円柱状の接続部３７ｂを一体に形成し、円板部３７ａの接続部３７ｂ側の外周は円錐状に面取りした形状に形成し、中心部には外部回路に接続するねじ穴３７ｃが設けられている。
【００１７】
４０は酸化亜鉛素子ブロック１１が挿入される絶縁筒であり、両端部の内周に第１の電極３３および第２の電極３７を係止する係止溝４０ｂがそれぞれ加工され、酸化亜鉛素子ブロック１１が配置された部分には外被を成型するときに絶縁筒４０の内径部と酸化亜鉛素子ブロック１１の外周部にも外被の絶縁材料が浸入するように穴４０ａが設けられている。４１は第１の電極３３、第２の電極３７を絶縁筒４０に係止するための止め輪である。止め輪４１は円形断面の線材を円形に形成し、端部を接続しないオープンリング状に形成している。３０は酸化亜鉛素子ブロック１１、円板１２、第１の電極３３、加圧部材１４、押え板１５、押圧ねじ１６、第２の電極３７で構成された酸化亜鉛素子モジュールである。４２は酸化亜鉛素子モジュール３０の外周部に被せられた外被であり、耐候性を備えた絶縁材料によりひだを有する形状に形成されている。
【００１８】
図３の組立手順は、まず第２の電極３７を絶縁筒４０の端部に配置し、係止溝４０ｂの部分に止め輪４１を装着し、酸化亜鉛素子ブロック１１を積層し、積層高さが所定の高さになるようにスペーサ１２により調整して絶縁筒２０ａの内径部に挿入し、酸化亜鉛素子ブロック１１の端部に第１の電極３３を配置して絶縁筒４０の係止溝４０ｂに止め輪４１を装着し、第１の電極３３のねじ穴３３ｃに押圧ねじ１６を螺合して押え板１５に押圧力を加えることにより、酸化亜鉛素子モジュール３０が組み立てられる。
【００１９】
絶縁筒４０の端部と第１の電極３３の係止状態における荷重の方向は図４に示すようになっている。第１の電極３３の円錐面の軸方向に対する傾斜角をθとすると、加圧部材１４の反力Ｆｙは、絶縁筒４０の係止溝４０ｂの傾斜角θに対応した次式のＦｓが斜め方向に加わる。
Ｆｓ＝Ｆｙ／ｓｉｎθ
絶縁筒４０の外周方向には次式のＦｘが加わる。
Ｆｘ＝Ｆｙ／ｔａｎθ
絶縁筒４０は外方に向かう荷重Ｆｘに対して機械的に耐える肉厚を確保しておく必要がある。
【００２０】
組み立てられた酸化亜鉛素子モジュール３０の外周に絶縁材料によりひだを有する形状に外被４２を加圧成型により被せて組立が完了する。外被４２を加圧成型することにより、絶縁材料が酸化亜鉛素子ブロック１１の外周と絶縁筒４０の内面との間に浸入してこの間の空隙がなくなり、酸化亜鉛素子ブロック１１の外周沿面の絶縁耐力が確保され、使用中の沿面放電が生じることが防止される。
【００２１】
このように酸化亜鉛素子ブロック１１を絶縁筒４０内に収容し、絶縁筒４０の両端部にオープンリング状の止め輪により電極を係止する構成としたことにより、絶縁等 40 の応力集中がなくなり、絶縁筒の肉厚をあまり厚くしなくても所定の強度の避雷器が構成でき、実施の形態１と同様の効果が得られる。
【００２２】
実施の形態３．
実施の形態３の避雷器の構成を図５に示す。実施の形態３は、実施の形態２の構成において、絶縁筒４０の係止部４０ａに加わる、加圧部材１４の反力に対応して加わる外周方向の荷重Ｆｘが働いた状態においても絶縁筒４０が耐えるように肉厚を厚くしておくことが必要であり、肉厚が厚くすることによる絶縁筒４０のコストが高くなる問題を解消する構成としたものである。
【００２３】
図５は実施の形態２の図３の構成の絶縁筒４０の係止溝４０ｂを設けた外周側に補強リング５１をはめ込んだ構成である。このように絶縁筒４０の係止溝４０ａ部分の外周側に補強リング５１をはめ込むと、係止溝４０ｂの部分が補強されて外径方向の機械的強度が増し、絶縁筒４０の肉厚が薄くても所定の強度が得られ構成となり、絶縁筒４０の製作コストが安くなる。
【００２４】
【発明の効果】
この発明の請求項１に係る避雷器は、絶縁筒の両端部それぞれに直角方向に貫通する長円形の係止穴を設け、第１の電極は、円板部外周に周方向に突出する一対の係止部を設けて絶縁筒の係止穴に係止し、第２の電極は、円板部を絶縁筒の係止穴に係止棒を挿入して係止する構成とし、第１の電極と酸化亜鉛素子ブロックの間に、円板状に形成し、厚さ方向に変位させることにより押圧力が発生する円板状ばね部材の加圧部材を配置し、絶縁筒内に配置された酸化亜鉛素子ブロックを、第１の電極のねじ穴に押圧ねじを螺合して締め付けることにより、加圧部材を介して酸化亜鉛素子ブロックに適正圧力が与えられる構成としたので、使用中に加わる曲げ荷重に対して、酸化亜鉛素子ブロックの積層高さが高くなってもその積層状態が絶縁筒により保持されて積層状態が崩れることがなくなり、高電圧用の場合でも一体で構成した避雷器が得られる。
【００２５】
この発明の請求項２に係る避雷器は、請求項１の構成の絶縁筒の両端部に設けた係止穴の第１の電極および第２の電極の係止部が当接する係止面は、円弧状に形成し、第１の電極の係止部および第２の電極側に挿入する係止棒の係止面の形状は、絶縁筒の係止穴の係止面の内面に沿う円弧状に形成したので、電極を係止した絶縁筒の係止部の応力集中が緩和されて、絶縁筒の肉厚を厚くしなくても所定の強度が得られる構成となる。
【００２６】
この発明の請求項３に係る避雷器は、絶縁筒の両端側内径部の上記第１の電極および第２に電極が配置される位置に係止溝を設け、第１の電極は、円板部とこの円板部の一面側に突出する接続部を一体に形成し、円板状部分の外周の接続部側の角部は円錐状に形成し、接続部中心位置軸方向にねじ穴を設け、第２の電極は、円板部とこの円板部の一面側に突出する接続部を一体に形成し、円板状部分の外周の接続部側の角部は円錐状に形成し、接続部中心位置に接続用ねじ穴を設けた構成とし、第１の電極および第２の電極は、絶縁筒に円形オープンリング状の止め輪を絶縁筒の係止溝に装着して係止する構成とし、押圧ねじを第１の電極のねじ穴に螺合し、締め付けることにより加圧部材を介して酸化亜鉛素子ブロックに適正圧力を与える構成としたので、絶縁筒両端部の一対の電極を係止する部分の応力が円周に分布して応力集中する部分がない構成となり、絶縁筒の肉厚をあまり厚くしなくても高電圧用の所定の強度の避雷器が構成できる。
【００２７】
この発明の請求項４に係る避雷器は、請求項３の構成の絶縁筒の両端の内周に係止溝を設けた外周に補強リングを配設したので、絶縁筒の電極の係止部が補強されて外径方向の機械的強度が増し、絶縁筒の肉厚を薄くしても所定の強度が得られ構成となり、絶縁筒の製作コストが安くなる。
【図面の簡単な説明】
【図１】実施の形態１の避雷器の断面図である。
【図２】実施の形態１の酸化亜鉛素子モジュール部分の構成を示す斜視図である。
【図３】実施の形態２の避雷器の断面図である。
【図４】実施の形態２の電極の係止部の荷重方向の説明図である。
【図５】実施の形態３の避雷器の断面図である。
【図６】従来の避雷器の構成図である。
【符号の説明】
１０酸化亜鉛素子モジュール、１１酸化亜鉛素子ブロック、１２円板、
１３第１の電極、１４加圧部材、１５押え板、１６押圧ねじ、
１７第２の電極、１８係止棒、２０絶縁筒、２２外被、
３０酸化亜鉛素子モジュール、３３第１の電極、３７第２の電極、
４０絶縁筒、４１止め輪、４２外被、５１補強リング。[0001]
BACKGROUND OF THE INVENTION
In this invention, a plurality of zinc oxide elements that protect electrical devices connected to a power system from abnormal voltages such as switching surges and lightning surges generated in a circuit are laminated, and an insulating material such as silicon rubber or polymer is laminated on the outer periphery. It relates to a lightning arrester with a jacket.
[0002]
[Prior art]
An example of a lightning arrester in which a plurality of zinc oxide elements are stacked and an outer peripheral portion is covered with an insulating material such as silicon rubber or polymer is disclosed in, for example, Japanese Patent Laid-Open No. 6-310307. The configuration is shown in FIG. 6A is an overall configuration diagram, FIG. 6B is a configuration diagram of a zinc oxide element module, and FIG. 6C is a plan view of an upper electrode portion. In the figure, 1 is a zinc oxide element block in which a plurality of zinc oxide elements 1a are stacked, 2 is provided with a flange 2a around it, and the upper electrode is provided with a plurality of bolt holes in the flange 2a portion, and 3 is a flange around 3a, a lower electrode provided with a plurality of bolt holes in the flange 3a portion, 4 is an insulating rod for fastening between the upper electrode 2 and the lower electrode 3 disposed at both ends of the zinc oxide element block 1, Nuts 8 at both ends of the insulating rod 4 are zinc oxide element modules 1 to 5. Reference numeral 9 denotes an outer cover formed in a shape having pleats by an insulating material such as silicon rubber or other polymer covering the outer periphery of the zinc oxide element module 8.
[0003]
With this configuration, the laminated zinc oxide element block 1 is firmly clamped by the insulating rod 4 to ensure mechanical strength, and the outer cover 9 is made of an insulating material having excellent weather resistance and tracking resistance. By forming, a small and lightweight outdoor lightning arrester excellent in weather resistance can be obtained.
[0004]
[Problems to be solved by the invention]
The lightning arrester configured as described above applies a pressing force to the zinc oxide element block 1 by the insulating rod 4 arranged on the outer periphery to apply a contact pressure to the contact portion of the zinc oxide element 1a, thereby ensuring mechanical strength. If the stacking height of the zinc oxide element block 1 is increased, the bending load applied during use cannot be endured, and the stacking state will be destroyed. Therefore, there is a problem that cannot be applied to high voltage applications where the stacking height increases. there were.
[0005]
The present invention has been made to solve the above-described problems. Even when the stacking height of the zinc oxide elements is increased, the stacked state is not destroyed, and the high voltage is configured by one zinc oxide element module. The purpose is to provide a possible lightning arrester.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, a lightning arrester accommodates a zinc oxide element block in which a plurality of zinc oxide elements are stacked in an insulating cylinder, and arranges a first electrode and a second electrode at both ends, and the insulating cylinder. In a lightning arrester covered with a pleated shape by an insulating material having weather resistance on the outer periphery, an oblong locking hole penetrating in a perpendicular direction is provided at each end of the insulating cylinder, and the first electrode is A disc portion, a pair of engaging portions projecting in the circumferential direction at positions opposite to the outer circumference of the disc portion, and a connecting portion projecting in the axial direction on one surface side of the disc portion, A screw hole penetrating in the axial direction is provided, and the second electrode has a disc portion and a connecting portion protruding in the axial direction on one surface side of the disc portion, and is perpendicular to the axial direction of the connecting portion. Formed in a shape with a penetrating locking hole, formed in a disk shape between the first electrode and the zinc oxide element block , A pressure member of a disc-shaped spring member that generates a pressing force by being displaced in the thickness direction, a zinc oxide element block is inserted into the insulating cylinder, and the second electrode is connected to the other end inner diameter of the insulating cylinder The locking rod for locking the second electrode is inserted into the locking hole on the other end side of the insulating cylinder and the locking hole of the second electrode, and a pressing screw is inserted into the screw hole of the first electrode. By screwing and tightening, an appropriate pressure is applied to the zinc oxide element block via the pressure member.
[0007]
A lightning arrester according to a second aspect of the present invention has a locking surface on which the first electrode of the locking hole and the locking portion of the second electrode provided at both ends of the insulating cylinder having the structure of the first aspect are in contact, The shape of the locking surface of the locking portion of the insulating tube formed in the arc shape and the locking surface of the locking rod inserted into the second electrode side is the inner surface of the locking surface of the locking hole of the insulating cylinder. Is formed in an arc shape along the line.
[0008]
According to a third aspect of the present invention, a lightning arrester accommodates a zinc oxide element block in which a plurality of zinc oxide elements are laminated in an insulating cylinder, and arranges a first electrode and a second electrode at both ends, and an insulating cylinder. In a lightning arrester that has a sheath with a pleated shape by an insulating material having weather resistance on the outer periphery,
The insulating cylinder is provided with a locking groove at a position where the first electrode and the second electrode are disposed on the inner diameter portion on both ends, and the first electrode is in the axial direction of the disk portion and one surface side of the disk portion. A connecting portion projecting from the outer periphery of the disc portion, a corner portion on the connecting portion side of the disc portion is formed in a conical shape, a screw hole penetrating in the axial direction of the connecting portion is provided, and the second electrode is a disc portion And a connecting portion projecting in the axial direction on the one surface side of the disc portion, the corner portion on the connecting portion side of the outer periphery of the disc portion is formed in a conical shape, and a screw hole for connection is provided at the center position of the connecting portion The first electrode is inserted into the position of the locking groove of the insulating cylinder, an open ring-shaped retaining ring is attached to the locking groove of the insulating cylinder, a pressure member is arranged on the first electrode side, and the oxidation The zinc element block is arranged in the insulating cylinder, the second electrode is arranged in the inner diameter part on the other end side of the insulating cylinder, and the same open ring-shaped retaining ring as the first electrode part is used as the locking groove of the insulating cylinder Dress And it is obtained by a configuration to provide the proper pressure in the zinc oxide element block via a pressure member by tightening screwed a pressure screw into the screw hole of the first electrode.
[0009]
According to a fourth aspect of the present invention, a lightning arrester is provided with a reinforcing ring on the outer periphery provided with locking grooves on the inner periphery of both ends of the insulating cylinder having the structure of the third aspect.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
The structure of the lightning arrester of Embodiment 1 is shown in FIG. 2 is a configuration of the zinc oxide element module portion of FIG. 1, FIG. 2 (a) is a perspective view showing an arrangement state of respective members stacked in the zinc oxide element block , and FIG. 2 (b) is a perspective view of an insulating cylinder. It is. In the figure, 11 is a zinc oxide element block in which a plurality of zinc oxide elements 11a are laminated, 12 is a disk that contacts the entire end face of the zinc oxide element block 11, and 20 is an insulating cylinder in which the zinc oxide element block 11 is accommodated. The locking holes 20a for locking the pair of electrodes are provided at both ends. A spacer 12a adjusts the stacking height of the zinc oxide element block 11 to a predetermined height. 13 is one first electrode of the pair of electrodes disposed on opposite sides of the zinc oxide element block, the connecting portion 13 c in the center of one surface of the disc portion 13a, on both sides with the locking portion facing the outer peripheral portion 13b are provided, screw holes 13 d is provided through the center portion. Reference numeral 14 denotes a pressurizing member composed of a disc spring that applies a pressing force to the zinc oxide element block 11. Reference numeral 15 denotes a pressing plate that presses the pressing member 14, and 16 denotes a pressing screw that presses the pressing plate 15. A headless hexagon socket set screw is suitable.
[0011]
Reference numeral 17 denotes a second electrode that is the other of the pair of electrodes. A connection portion 17b is provided at the center of one surface of the disc portion 17a, and a screw hole 17c for connection is provided at the center. Reference numeral 18 denotes a locking rod for locking the second electrode 17 to the insulating cylinder 20. The shape of the engaging portion 13 b of the first electrode 13 and the portion of the engaging rod 18 in contact with the engaging hole 20 a of the insulating tube 20 is formed in an arc shape. Reference numeral 10 denotes a zinc oxide element module having a configuration in which a zinc oxide element block 11, a disk 12, a first electrode 13, a pressing member 14, a pressing plate 15, a pressing screw 16, and a second electrode 17 are accommodated in an insulating cylinder 20. It is. Reference numeral 22 denotes an outer cover that covers the outer peripheral portion of the zinc oxide element module 10 and is formed in a shape having pleats by an insulating material having weather resistance.
[0012]
In the assembly procedure of FIG. 1, first, the locking portion 13b of the first electrode 13 is mounted in the locking hole 20a portion of the insulating cylinder 20, and the stacking height of the zinc oxide element block 11 becomes a predetermined height. In this way, the spacers 12 are adjusted and stacked, and accommodated in the inner diameter portion of the insulating cylinder 20. Next, the second electrode 17 is disposed at the stacked end of the zinc oxide element block 11, the locking rod 18 is inserted into the locking hole 20 a of the insulating cylinder 20, and the screw hole 13 d of the first electrode 13 is inserted. The zinc oxide element module 10 is assembled by screwing the pressing screw 16 and applying a pressing force to the pressing plate 15.
[0013]
Assembling is completed by covering the outer periphery of the assembled zinc oxide element module 10 in a shape having a pleat with an insulating material by pressure molding. The outer cover 22 is filled with an insulating material between the outer periphery of the zinc oxide element block 10 and the inner surface of the insulating cylinder 20 at the time of pressure molding, and is finished in a state having no gap. Secured.
[0014]
Since the zinc oxide element block 11 is housed in the insulating cylinder 20 in this way, the laminated state of the zinc oxide element block 11 is held by the insulating cylinder 20 against the bending load applied during use of the lightning arrester. Even if the height is increased, the stacked state in use does not collapse, and a high voltage, for example, 110 kV class lightning arrester can be integrally formed.
Moreover, since the 1st electrode 13 and the 2nd electrode 17 comprised the disc part and the connection part integrally, and the pressurization member used the flat disk spring, the height of an electrode part can be made low. The height of the lightning arrester can be kept low.
[0015]
Embodiment 2. FIG.
The structure of the lightning arrester of Embodiment 2 is shown in FIG. In the first embodiment, the first electrode 13 and the second electrode 17 of the pair of electrodes disposed on both end faces of the zinc oxide element block are locked in the locking holes 20a at the end of the insulating cylinder 20, and Therefore, the reaction force that pressed the zinc oxide element block 11 is applied as a concentrated load to the locking portion 20a of the insulating cylinder 20, and the thickness must be increased so that this portion can withstand the pressing force. There is a problem that the cost of the cylinder 20 is increased. To solve this problem, which was constructed a locking method of a pair of electrodes and an insulating tube disposed in the both end portions of Embodiment 2, the zinc oxide element block 11 of implementation so as to be distributed evenly around the insulating cylinder is there.
[0016]
In the figure, the zinc oxide element block 11, the circular plate 12, the pressing member 14, the pressing plate 15, and the pressing screw 16 are the same as those in FIGS. 1 and 2 of the first embodiment. 33 and 37 are electrodes arranged at both ends of the zinc oxide element block 11, 33 is a first electrode on one end side where the pressing member 14 is arranged, and 37 is a first electrode on the other end side of the zinc oxide element block 11. 2 electrodes. The first electrode 33 is formed integrally with a disk portion 33a and a columnar connection portion 33b on one surface side thereof, and the outer periphery of the disk portion 33a on the connection portion 33b side is formed in a conical chamfered shape, The part is provided with a threaded hole 33c. The second electrode 37 is integrally formed with a disc portion 37a and a cylindrical connecting portion 37b on one surface side thereof, and the outer periphery of the disc portion 37a on the connecting portion 37b side is formed in a conical chamfered shape, The part is provided with a screw hole 37c connected to an external circuit.
[0017]
Reference numeral 40 denotes an insulating cylinder into which the zinc oxide element block 11 is inserted. Locking grooves 40b for locking the first electrode 33 and the second electrode 37 are respectively formed on the inner circumferences of both ends, and the zinc oxide element block is processed. 11 is provided with a hole 40a so that the insulating material of the outer sheath can also enter the inner diameter portion of the insulating cylinder 40 and the outer peripheral portion of the zinc oxide element block 11 when the outer shell is molded. . Reference numeral 41 denotes a retaining ring for locking the first electrode 33 and the second electrode 37 to the insulating cylinder 40. The retaining ring 41 is formed in an open ring shape in which a wire having a circular cross section is formed in a circular shape and ends thereof are not connected. Reference numeral 30 denotes a zinc oxide element module including the zinc oxide element block 11, the disk 12, the first electrode 33, the pressing member 14, the pressing plate 15, the pressing screw 16, and the second electrode 37. Reference numeral 42 denotes an outer cover placed on the outer peripheral portion of the zinc oxide element module 30 and is formed in a shape having pleats by an insulating material having weather resistance.
[0018]
In the assembly procedure of FIG. 3, first, the second electrode 37 is disposed at the end of the insulating cylinder 40, the retaining ring 41 is attached to the portion of the locking groove 40b, the zinc oxide element blocks 11 are stacked, and the stacking height is set. Is adjusted by the spacer 12 so as to have a predetermined height, and is inserted into the inner diameter portion of the insulating cylinder 20a, and the first electrode 33 is disposed at the end of the zinc oxide element block 11 so that the locking groove of the insulating cylinder 40 is provided. The zinc oxide element module 30 is assembled by attaching the retaining ring 41 to 40 b, screwing the pressing screw 16 into the screw hole 33 c of the first electrode 33 and applying pressing force to the pressing plate 15.
[0019]
The direction of the load in the locked state between the end of the insulating cylinder 40 and the first electrode 33 is as shown in FIG. Assuming that the inclination angle of the conical surface of the first electrode 33 with respect to the axial direction is θ, the reaction force Fy of the pressure member 14 is Fs in the following equation corresponding to the inclination angle θ of the locking groove 40b of the insulating cylinder 40 is oblique. Join the direction.
Fs = Fy / sin θ
In the outer peripheral direction of the insulating cylinder 40, Fx of the following formula is added.
Fx = Fy / tan θ
The insulating cylinder 40 needs to secure a thickness that can mechanically withstand the outward load Fx.
[0020]
The assembly is completed by covering the outer periphery of the assembled zinc oxide element module 30 in a shape having a pleat with an insulating material by pressure molding. By press-molding the jacket 42, the insulating material enters between the outer periphery of the zinc oxide element block 11 and the inner surface of the insulating cylinder 40, eliminating the gap between them, and insulating the outer surface along the outer periphery of the zinc oxide element block 11. Yield strength is ensured and the occurrence of creeping discharge during use is prevented.
[0021]
By thus zinc oxide element block 11 housed in an insulating tube 40, and configured to engage the electrode by retaining ring open ring at both ends of the insulation barrel 40, the stress concentration of the insulating such 40 Thus, a lightning arrester having a predetermined strength can be configured without making the insulating cylinder too thick, and the same effect as in the first embodiment can be obtained.
[0022]
Embodiment 3 FIG.
The structure of the lightning arrester of Embodiment 3 is shown in FIG. In the third embodiment, in the configuration of the second embodiment, the insulating cylinder is applied even in the state where the outer circumferential load Fx applied to the locking portion 40a of the insulating cylinder 40 corresponding to the reaction force of the pressing member 14 is applied. It is necessary to increase the wall thickness so that it can withstand 40, and the configuration is made to eliminate the problem that the cost of the insulating cylinder 40 increases due to the increase in wall thickness.
[0023]
FIG. 5 shows a configuration in which a reinforcing ring 51 is fitted on the outer peripheral side provided with the locking groove 40b of the insulating cylinder 40 of the configuration of FIG. 3 of the second embodiment. Thus, when the reinforcing ring 51 is fitted on the outer peripheral side of the locking groove 40a portion of the insulating tube 40, the locking groove 40b portion is reinforced, the mechanical strength in the outer diameter direction is increased, and the thickness of the insulating tube 40 is increased. Even if it is thin, a predetermined strength can be obtained, and the manufacturing cost of the insulating cylinder 40 can be reduced.
[0024]
【The invention's effect】
According to a first aspect of the present invention, the lightning arrester is provided with an oblong locking hole penetrating in a right angle direction at each of both end portions of the insulating cylinder, and the first electrode is a pair of protrusions protruding in the circumferential direction on the outer periphery of the disk portion. The second electrode has a configuration in which a locking bar is inserted into the locking hole of the insulating tube to lock the disk portion. Between the electrode and the zinc oxide element block, a pressure member of a disk-shaped spring member that is formed in a disk shape and generates a pressing force by being displaced in the thickness direction is disposed in an insulating cylinder The zinc oxide element block is configured so that an appropriate pressure is applied to the zinc oxide element block via the pressure member by screwing and tightening a pressing screw into the screw hole of the first electrode. Even if the stacking height of the zinc oxide element block increases with respect to the bending load, the stacking state is an insulating cylinder. The more retained prevents the stacked state collapses, constituting the arrester can be obtained in integral even in the case of high voltage.
[0025]
A lightning arrester according to a second aspect of the present invention has a locking surface on which the first electrode of the locking hole and the locking portion of the second electrode provided at both ends of the insulating cylinder having the structure of the first aspect are in contact, The shape of the locking surface of the locking rod formed in an arc shape and inserted into the locking portion of the first electrode and the second electrode side is an arc shape along the inner surface of the locking surface of the locking hole of the insulating cylinder As a result, the stress concentration at the locking portion of the insulating cylinder that locks the electrode is alleviated, and a predetermined strength can be obtained without increasing the thickness of the insulating cylinder.
[0026]
According to a third aspect of the present invention, a lightning arrester is provided with a locking groove at a position where the first electrode and the second electrode are arranged on both end inner diameter portions of the insulating cylinder, and the first electrode is a disc portion. And a connecting portion that protrudes to the one surface side of the disk portion is formed integrally, a corner portion of the outer periphery of the disk-shaped portion is formed in a conical shape, and a screw hole is provided in the axial direction of the connecting portion center position The second electrode is formed integrally with a disk part and a connection part protruding to one surface side of the disk part, and the corner part on the connection part side of the outer periphery of the disk part is formed in a conical shape. A structure in which a screw hole for connection is provided at the center position of the part, and the first electrode and the second electrode are configured to be fixed by attaching a circular open ring-shaped retaining ring to the locking groove of the insulating cylinder. Then, the pressure screw is screwed into the screw hole of the first electrode and tightened to apply an appropriate pressure to the zinc oxide element block via the pressure member. As a result, the stress of the part that locks the pair of electrodes at both ends of the insulating cylinder is distributed around the circumference and there is no stress concentration part, so high voltage can be achieved without making the insulating cylinder too thick. A lightning arrester with a predetermined strength can be constructed.
[0027]
In the lightning arrester according to claim 4 of the present invention, since the reinforcing ring is disposed on the outer periphery of the insulating tube having the structure of claim 3 provided on the inner periphery of both ends, the locking portion of the electrode of the insulating tube is provided. Reinforced, the mechanical strength in the outer diameter direction is increased, and even if the thickness of the insulating cylinder is reduced, a predetermined strength can be obtained and the manufacturing cost of the insulating cylinder is reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lightning arrester according to a first embodiment.
FIG. 2 is a perspective view showing a configuration of a zinc oxide element module portion according to the first embodiment.
FIG. 3 is a cross-sectional view of a lightning arrester according to a second embodiment.
FIG. 4 is an explanatory diagram of a load direction of an electrode locking portion according to a second embodiment.
FIG. 5 is a cross-sectional view of a lightning arrester according to a third embodiment.
FIG. 6 is a configuration diagram of a conventional lightning arrester.
[Explanation of symbols]
10 zinc oxide element module, 11 zinc oxide element block, 12 disc,
13 first electrode, 14 pressure member, 15 presser plate, 16 pressing screw,
17 second electrode, 18 locking rod, 20 insulating cylinder, 22 outer jacket,
30 Zinc oxide element module, 33 1st electrode, 37 2nd electrode,
40 Insulating cylinder, 41 retaining ring, 42 jacket, 51 reinforcing ring.

Claims

A zinc oxide element block in which a plurality of zinc oxide elements are stacked , an insulating cylinder that accommodates the zinc oxide element block in an inner diameter portion, and one end side of both end faces of the zinc oxide element block accommodated in the insulating cylinder A first electrode disposed and locked to the inner peripheral portion at one end of the insulating tube, a second electrode locked to the inner peripheral portion at the other end of the insulating tube, the first electrode, and the zinc oxide A zinc oxide element module is configured with a pressure member that is disposed between one end face of the element block and applies a predetermined pressing force to the zinc oxide element, and has weather resistance on the outer periphery of the insulating cylinder of the zinc oxide element module. In a lightning arrester covered with a pleated shape by an insulating material with
An oblong locking hole penetrating in a perpendicular direction is provided at each end of the insulating cylinder, and the first electrode protrudes in a circumferential direction at a position where the disk portion and the outer periphery of the disk portion face each other. The second electrode has a locking portion and a connecting portion protruding in the axial direction on one surface side of the disk portion, and is formed in a shape provided with a screw hole penetrating in the axial direction at the center of the connecting portion. Has a disk part and a connecting part protruding in the axial direction on one side of the disk part, and is formed in a shape provided with a locking hole penetrating in a direction perpendicular to the axial direction of the connecting part, The pressurizing member is a disc-shaped spring member that is formed in a disc shape and generates a pressing force by being displaced in the thickness direction. The first electrode is inserted into one end of the insulating cylinder, and is locked. Is inserted into a locking hole on one end side of the insulating cylinder, the pressure member is arranged on the zinc oxide element block side of the first electrode, and the acid The zinc element block is inserted into the insulating cylinder, the second electrode is disposed at the other end inner diameter portion of the insulating cylinder, the other end side locking hole of the insulating cylinder and the locking hole of the second electrode A locking rod for locking the second electrode is inserted, a press screw is screwed into the screw hole of the first electrode, and tightened to tighten the zinc oxide element block through the pressure member. A lightning arrester characterized by giving .

Locking surfaces with which the locking portions of the first electrode and the second electrode of the locking holes provided at both ends of the insulating cylinder abut are formed in an arc shape, and the locking of the first electrode The shape of the locking surface of the locking portion and the locking surface of the locking rod inserted into the second electrode side is formed in an arc shape along the inner surface of the locking surface of the locking hole of the insulating cylinder. The lightning arrester according to claim 1.

A zinc oxide element block in which a plurality of zinc oxide elements are stacked, an insulating cylinder that accommodates the zinc oxide element block in an inner diameter portion, and one end side of both end faces of the zinc oxide element block accommodated in the insulating cylinder A first electrode disposed and locked to the inner peripheral portion at one end of the insulating tube, a second electrode locked to the inner peripheral portion at the other end of the insulating tube, the first electrode, and the zinc oxide A zinc oxide element module is configured with a pressure member that is disposed between one end face of the element block and applies a predetermined pressing force to the zinc oxide element, and has weather resistance on the outer periphery of the insulating cylinder of the zinc oxide element module. In a lightning arrester covered with a pleated shape by an insulating material with
The insulating cylinder is provided with a locking groove at a position where the first electrode and the second electrode are disposed on both inner diameter portions, and the first electrode includes a disc portion and one surface side of the disc portion. A connecting portion projecting in the axial direction of the disk portion, forming a conical corner on the outer periphery of the disk portion, and providing a screw hole for screwing through the connecting portion in the axial direction, The second electrode has a disk part and a connection part projecting to one surface side of the disk part, and a corner part on the connection part side of the outer periphery of the disk part is formed in a conical shape. A screw hole for connection is provided at the center position of the part, the first electrode is inserted into a position of the locking groove of the insulating cylinder, an open ring-shaped retaining ring is attached to the locking groove of the insulating cylinder, The pressurizing member is disposed on the first electrode side, the zinc oxide element block is disposed in the insulating cylinder, and the second electrode is disposed on the inner diameter side of the other end of the insulating cylinder. The pressurizing member is formed by mounting the same open ring-shaped retaining ring as the first electrode portion in the locking groove of the insulating cylinder, screwing a press screw into the screw hole of the first electrode, and tightening. A lightning arrester characterized in that an appropriate pressure is applied to the zinc oxide element block via a wire .

4. A lightning arrester according to claim 3, wherein a reinforcing ring is provided on the outer periphery of the insulating tube having a locking groove on the inner periphery of both ends .