JPS5846514Y2 - Fuse tube for cylindrical cutout - Google Patents

Description

【考案の詳細な説明】 本案は円筒形カットアウトに使用するヒユーズ筒の改良
に係り、特に遮断後、多重雷等の異常電圧によってヒユ
ーズ筒の外部極間で二次閃絡及び二次閃絡に伴なう短絡
事故が発生しないようにした構造に関するものである。[Detailed description of the invention] This invention relates to the improvement of fuse tubes used in cylindrical cutouts, and in particular, after the cutout, secondary flashovers and secondary flashovers occur between the outer poles of the fuse tubes due to abnormal voltages such as multiple lightning strikes. This relates to a structure that prevents short-circuit accidents from occurring.

高圧配電線路に於いて、初柱上変圧器の高圧側に保護用
として使用されている円筒形カットアウトは第１図に示
す構造である。In high-voltage distribution lines, the cylindrical cut-out used for protection on the high-voltage side of the first pole transformer has the structure shown in FIG.

即ち上端を閉鎖した円筒形の磁器性の本体Ａ内には、そ
の上部に上方に導出した上部日出線１に結がる上部接触
片２を、又、下部には側方に突出する下部日出線３に結
がる下部接触片４を設け、この面接触片２，４に対しヒ
ユーズ筒Ｂの上部電極５及び下部電極６を夫々接触させ
てヒユーズ筒を上下方向に保持している。That is, inside the cylindrical porcelain main body A with its upper end closed, there is an upper contact piece 2 connected to the upper sunrise wire 1 led out upward, and a lower part projecting laterally at the bottom. A lower contact piece 4 connected to the sunrise wire 3 is provided, and the upper electrode 5 and lower electrode 6 of the fuse tube B are brought into contact with the surface contact pieces 2 and 4, respectively, to hold the fuse tube in the vertical direction. .

そして雷等によって変圧器のブッシングでフラッシュオ
ーバーが起ると続流がヒユーズＣに流れ遮断が行なわれ
るのであるが、最近使用されているヒユーズ筒は、第１
図及び第２図から判るように大電流遮断時の圧力上昇に
対し充分耐えられるように断面＝＝形の固定金具７を絶
縁筒８の上端外周に被着して機械的強度を高めている。When a flashover occurs at the transformer bushing due to lightning, etc., the follow-on current flows to fuse C and is shut off.
As can be seen from the figures and Fig. 2, a fixing metal fitting 7 with a cross-sectional shape of == is attached to the outer periphery of the upper end of the insulating cylinder 8 to increase mechanical strength so as to be able to sufficiently withstand the pressure increase when a large current is cut off. .

ところが上記の構造においては、固定金具を下部電極６
側に延長している為に両者で形成している外部極間距離
１１は短かくなっている。However, in the above structure, the fixing fitting is connected to the lower electrode 6.
Since it extends to the side, the distance 11 between the outer poles formed by the two is short.

この絶縁距離はヒユーズが溶断すると絶縁筒が垂下する
為更に距離１２と短かくなる。This insulation distance becomes even shorter to 12 because the insulation cylinder hangs down when the fuse blows.

（第３図参照）故に、遮断後に多重雷等異常電圧が印加
されるとそのインパルス電圧が上記ヒユーズ筒の極間に
加わって外部二次閃絡を発生させる。(See FIG. 3) Therefore, when an abnormal voltage such as multiple lightning is applied after the fuse is cut off, the impulse voltage is applied between the poles of the fuse cylinder, causing an external secondary flash fault.

すると二次閃絡に重畳して極間短絡が発生し下部電極６
によって閉鎖された本体内の空隙ａはアークが充満する
結果本体（磁器性）の偏熱破壊、或いは空隙内の圧力上
昇によるヒユーズ筒の落下事故等、公衆災害を招ねく原
因となる。Then, a short circuit occurs between the electrodes superimposed on the secondary flash fault, and the lower electrode 6
The gap a in the main body closed by the arc is filled with arcs, resulting in uneven heat destruction of the main body (porcelain), or a falling accident of the fuse cylinder due to the pressure increase in the gap, which may lead to public disasters.

本案は、これら欠点にかんがみて提案するもので、絶縁
筒内に絶縁チューブを介してヒユーズを装着したヒユー
ズ筒Ｂを、上端を閉鎖した円筒形本体Ａ内に、前記ヒユ
ーズ筒の上端に固定金具７を介して固設した上部電極５
とヒユーズ筒の下部外周に遊嵌した下部電極６とを夫々
本体Ａ内の上下に固設した接触片２，４に対し接触させ
て保持させたものにおいて、前記下部電極６の放電端を
絶縁物で被覆すると共に前記固定金具７を絶縁筒８の上
端に内挿して固定し、該固定金具と絶縁筒内壁とヒユー
ズの絶縁チューブとの間に設けた放電用の中間両極２５
と絶縁筒の下端外周に設けた放電案内金具１１とにより
内部二次閃絡の誘発経路を構成したことを特徴とするも
のである。This proposal is proposed in view of these shortcomings. A fuse tube B, in which a fuse is attached to an insulating tube via an insulating tube, is placed inside a cylindrical body A whose upper end is closed, and a metal fitting is attached to the upper end of the fuse tube. Upper electrode 5 fixed via 7
and a lower electrode 6 loosely fitted on the lower outer periphery of the fuse cylinder are held in contact with contact pieces 2 and 4 fixedly installed on the upper and lower sides of the main body A, respectively, in which the discharge end of the lower electrode 6 is insulated. The fixing metal fitting 7 is inserted and fixed into the upper end of the insulating cylinder 8, and the intermediate bipolar pole 25 for discharging is provided between the fixing metal fitting, the inner wall of the insulating cylinder, and the insulating tube of the fuse.
and a discharge guide fitting 11 provided on the outer periphery of the lower end of the insulating cylinder constitute a path for inducing internal secondary flash faults.

以下本案の実施例について説明すると、第４図は本考案
の垂下方式のヒユーズ筒を示すもので、８は大電流遮断
の際の圧力にも充分耐えることができるＦＲＰ等の強化
プラスチックより成る絶縁筒、７は絶縁筒の上部に内挿
して固着した固定金具でありその接続部７ａのネジ部７
ｂを内壁のネジ部８ａに対し接着材９を介して固着した
もので、同金具７は下部電極６の方向へ延長して取付け
て機械的強度を高めている。To explain the embodiment of the present invention below, Fig. 4 shows a hanging type fuse tube of the present invention, and 8 is an insulating material made of reinforced plastic such as FRP that can sufficiently withstand pressure when interrupting a large current. The cylinder 7 is a fixing fitting inserted and fixed in the upper part of the insulating cylinder, and the threaded part 7 of the connection part 7a
b is fixed to the threaded portion 8a of the inner wall via an adhesive 9, and the metal fitting 7 is extended and attached in the direction of the lower electrode 6 to increase mechanical strength.

６は絶縁筒の下部外周に遊嵌した下部電極であり、上端
５ａ’及び内面６ａ ”の放電端６ａは合成樹脂等の絶
縁物１０によって被覆され、これによって下部電極附近
の電界の緩和と、上記固定金具７とで形成する外部極間
距離（絶縁距離）ｌｏを長くして外部絶縁を高めている
。Reference numeral 6 denotes a lower electrode loosely fitted to the lower outer periphery of the insulating cylinder, and the upper end 5a' and the discharge end 6a of the inner surface 6a'' are covered with an insulator 10 such as synthetic resin, thereby relaxing the electric field near the lower electrode. The external insulation distance is increased by increasing the external pole distance (insulation distance) lo formed with the fixing fitting 7.

１１は絶縁筒の下端放出口８ｂ附近の外周に嵌着した放
電案内金具であり、コイルスプリング１２によって下部
電極６と電気的に結がっている。Reference numeral 11 denotes a discharge guide fitting fitted on the outer periphery of the insulating cylinder near the lower end discharge port 8b, and is electrically connected to the lower electrode 6 by a coil spring 12.

又コイルスプリング１２は内部に装着したヒユーズＣに
よって平常時は圧縮されているがヒユーズＣが遮断する
と絶縁筒８を下方（矢印イ方向）に垂下させる為、上部
電極５は本体側の上部接触片２より離脱しそれと同時に
下端の表示部８Ｃが本体の下端開口部すを封鎖する密閉
蓋１３を落下させてヒユーズの溶断（遮断）状態を知ら
せる。In addition, the coil spring 12 is normally compressed by a fuse C installed inside, but when the fuse C is cut off, the insulating tube 8 hangs downward (in the direction of arrow A), so the upper electrode 5 is connected to the upper contact piece on the main body side. At the same time, the display section 8C at the lower end causes the sealing lid 13 that closes the lower end opening of the main body to drop, thereby informing the user of the blown (cut off) state of the fuse.

８ｄは垂下の際絶縁物１０の上面１０ａに衝突して絶縁
筒の垂下動作を規制する係止段部、１４は絶縁筒の下端
の放出口より導出して折り返えしリード線２３の先端を
接続するようにした蝶ナツトを示す。8d is a locking step that collides with the upper surface 10a of the insulator 10 when hanging down and restricts the drooping movement of the insulating tube, and 14 is the tip of the folded lead wire 23 led out from the outlet at the lower end of the insulating tube. This shows the butterfly nut used to connect the .

尚、ヒユーズ筒内に装着するヒユーズは複合形の張力ヒ
ユーズであり、絶縁チューブ１５の上部にはボタンヘッ
ドより成る上部端子１６を備えると共にその接続部１６
ａの長さｍを従来の接続部より下方（下部電極側）へ
長くして大電流遮断の際でもアーキングによって接続部
が溶損せずに第６図の如く筒内に残存するように工夫し
これを上記の放電用案内金具１１と対向させて内部二次
閃絡経路を形成している。The fuse installed in the fuse cylinder is a composite tension fuse, and the upper part of the insulating tube 15 is provided with an upper terminal 16 consisting of a button head, and the connecting portion 16
The length m of a is made longer downward (towards the lower electrode) than the conventional connection part, so that even when a large current is cut off, the connection part will not be melted and damaged by arcing and will remain in the cylinder as shown in Figure 6. This is opposed to the discharge guide fitting 11 to form an internal secondary flash path.

つまりヒユーズ遮断後に於いてヒユーズ筒外部の上下部
電極間の絶縁耐力を上記の内部の上下部電極より高くす
るように絶縁協調を採りこれによって二次閃絡が内部経
路で先行して行なわれるようにしている。In other words, after the fuse is cut off, insulation coordination is adopted so that the dielectric strength between the upper and lower electrodes on the outside of the fuse cylinder is higher than that of the upper and lower electrodes on the inside, so that secondary flashover occurs in advance in the internal path. I have to.

１７は絶縁チューブ内に内張した硼酸等の消弧剤、１８
は上部端子１６と接続金具１９間に接続した低融点合金
２０とそれに結がる抵抗線２１から成る可溶体と、これ
に並列に添設した張力線２２．２３は接続金具１９に一
端を接続した撚線よりなるヒユーズリード線、２４はス
トッパーを示す。17 is an arc extinguishing agent such as boric acid lined inside the insulating tube; 18
A fusible body consisting of a low melting point alloy 20 and a resistance wire 21 connected to it is connected between the upper terminal 16 and the connecting fitting 19, and tension wires 22 and 23 attached in parallel to this are connected at one end to the connecting fitting 19. 24 indicates a stopper.

第５図は本考案の他の実施例を示す非垂下方式のヒユー
ズ筒であり下部電極６は絶縁筒８の下部外周に一体に固
着したもので、絶縁筒は垂下しない外、放電用案内金具
１１と下部電極６を結ぐコイルスプリング１２が電気的
に直結するのではなく下端に遊嵌した表示筒２５の係合
部ｄを挾んで間接的に連結している。FIG. 5 shows a non-dripping type fuse tube showing another embodiment of the present invention, in which the lower electrode 6 is integrally fixed to the lower outer periphery of the insulating tube 8, and the insulating tube does not hang down, and the discharge guide metal fittings are shown in FIG. The coil spring 12 connecting the lower electrode 6 and the lower electrode 11 is not electrically connected directly, but indirectly connected by sandwiching the engaging portion d of the display tube 25 that is loosely fitted to the lower end.

又、ヒユーズが溶断すると表示筒のみがコイルスプリン
グによって下方に垂下する。Furthermore, when the fuse blows, only the display cylinder hangs downward due to the coil spring.

尚、上部電極等の構造は第４図に示す垂下方式の構造と
同一である。The structure of the upper electrode etc. is the same as the structure of the hanging type shown in FIG.

本案は以上の如く遮断後のヒユーズ筒の極間絶縁を内部
が外部より先行して閃絡するように絶縁協調を採った結
果、筒内のヒユーズが短絡電流によって遮断した後、多
重雷等の異常電圧が印加された場合でも、その電圧は上
部接触片２−上部電極５−ヒユーズの上部端子の接続部
１６ ａ−放電用案内金具１１一本体側の中間電極２６
−係合片２７−閃絡角２８の二次閃絡経路で閃絡しそれ
に重畳して発生する短絡時のアークが上記経路より明ら
かなように絶縁筒内の上部端子と放電用案内金具間で発
生する結果、絶縁筒部材より発生する消弧性ガス又はそ
の圧力効果等によってそのアークは消弧され、更に一部
は下端放出口より放出されて遮断は行なわれる為、従来
みられたような外部閃絡による磁器体の偏熱破壊が防止
されることは勿論のこと、ヒユーズ筒は下端からのアー
クの放出によって上方に押し上げられる為、ヒユーズ筒
は落下することがない等安全性を著しく向上させること
ができるもので、実用上の効果は大きい。As described above, as a result of the insulation coordination between the poles of the fuse cylinder after the fuse is cut off, so that the inside flashes before the outside, after the fuse inside the cylinder is cut off by the short-circuit current, multiple lightning strikes, etc. Even if an abnormal voltage is applied, the voltage will be applied to the upper contact piece 2 - the upper electrode 5 - the connection part 16 of the upper terminal of the fuse - a - the discharge guide fitting 11 - the intermediate electrode 26 on the main body side.
- Engagement piece 27 - The arc at the time of a short circuit generated by flashing and superimposing on the secondary flashing path of flashing angle 28 is clearly seen from the above path between the upper terminal in the insulating cylinder and the discharge guide fitting. As a result, the arc is extinguished by the arc-extinguishing gas generated from the insulating cylindrical member or its pressure effect, and a part of it is released from the lower end discharge port to perform the interruption, so the arc is Not only does this prevent uneven heat damage to the porcelain body due to external flash faults, but since the fuse tube is pushed upward by the discharge of the arc from the bottom end, the fuse tube will not fall, greatly improving safety. This can be improved and has great practical effects.

尚、本案のヒユーズ筒は既設のカットアウトに使用でき
ることは云う迄もないことである。It goes without saying that the fuse tube of the present invention can be used in an existing cutout.

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

第１図は従来の構造から戊るヒユーズ筒を備えた円筒形
カットアウトの縦断面図、第２図は従来例のヒユーズ筒
の縦断面図、同じく第３図はヒユーズ溶断後を示す従来
例のヒユーズ筒、第４図は本考案の実施例を示すヒユー
ズ筒の縦断面図、第５図は本案の他の実施例を示すヒユ
ーズ筒の縦断面図、第６図は第４図の遮断後の状態を示
すヒユーズ筒の縦断面図。 Ａ・・・・・・本体、Ｂ・・・・・・ヒユーズ筒、Ｃ・
・・・・・ヒユーズ、２・・・・・・上部接触片、４・
・・・・・下部接触片、５・・・・・・上部電極、６・
・・・・・下部電極、６ａ・・・・・・放電端、７・・
・・・・固定金具、７ａ・・・・・・接続部、８・・・
・・・絶縁筒、１０・・・・・・絶縁物。Figure 1 is a vertical cross-sectional view of a cylindrical cutout with a fuse tube removed from a conventional structure, Figure 2 is a vertical cross-sectional view of a conventional fuse tube, and Figure 3 is a conventional example showing the fuse after it has been blown. FIG. 4 is a vertical cross-sectional view of the fuse tube showing an embodiment of the present invention, FIG. 5 is a vertical cross-sectional view of the fuse tube showing another embodiment of the present invention, and FIG. 6 is a cut-off of the fuse tube of FIG. 4. FIG. 7 is a vertical cross-sectional view of the fuse tube showing its later state. A: Body, B: Fuse tube, C.
... Fuse, 2 ... Upper contact piece, 4.
... lower contact piece, 5 ... upper electrode, 6.
...Lower electrode, 6a...Discharge end, 7...
...Fixing bracket, 7a...Connection part, 8...
...Insulating tube, 10...Insulator.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 絶縁筒内に絶縁チューブを介してヒユーズを装着したヒ
ユーズ筒Ｂを、上端を閉鎖した円筒形本体Ａ内に、前記
ヒユーズ筒の上端に固定金具７を介して固設した上部電
極５とヒユーズ筒の下部外周に遊嵌した下部電極６とを
夫々本体Ａ内の上下に固設しだ接触片２，４に対し接触
させて保持させたものにおいて、前記下部電極６の放電
端を絶縁物で被覆すると共に前記固定金具７を絶縁筒８
の上端に内挿して固定し、該固定金具と絶縁筒内壁とヒ
ユーズの絶縁チューブとの間に設けた放電用の中間両極
２５と絶縁筒の下端外周に設けた放電案内金具１１とに
より内部二次閃絡の誘発経路を構成したことを特徴とす
る円筒形カットアウト用ヒユーズ筒。A fuse tube B, in which a fuse is mounted inside an insulating tube via an insulating tube, is placed inside a cylindrical main body A with a closed top end, and an upper electrode 5 and a fuse tube are fixed to the upper end of the fuse tube via a fixing fitting 7. A lower electrode 6 loosely fitted on the outer periphery of the lower part of the main body A is held in contact with contact pieces 2 and 4 fixed on the upper and lower sides of the main body A, respectively, in which the discharge end of the lower electrode 6 is made of an insulator. At the same time, the fixing fitting 7 is covered with an insulating tube 8.
It is inserted into the upper end of the insulating cylinder and fixed therein, and is connected to the internal electrode by an intermediate pole 25 for discharging provided between the fixing metal fitting, the inner wall of the insulating cylinder, and the insulating tube of the fuse, and a discharge guide fitting 11 provided on the outer periphery of the lower end of the insulating cylinder. A cylindrical cutout fuse tube characterized by configuring a path for inducing secondary flash faults.