JP4074706B2

JP4074706B2 - Reinforcement structure of lead wire of cylindrical high-pressure cutout

Info

Publication number: JP4074706B2
Application number: JP15089898A
Authority: JP
Inventors: 修士加藤
Original assignee: Nippon Kouatsu Electric Co
Current assignee: Nippon Kouatsu Electric Co
Priority date: 1998-06-01
Filing date: 1998-06-01
Publication date: 2008-04-09
Anticipated expiration: 2018-06-01
Also published as: JPH11345558A

Description

【０００１】
【発明の属する技術分野】
本願発明は円筒形高圧カットアウトの口出し線の補強構造に関するもので、特に芯線切れ防止を目的としたものである。
【０００２】
【従来の技術】
図９及び図１０に示すように柱上変圧器１００（１０１）の高圧１次側保護用として使用される円筒形高圧カットアウト１０２はその上部の口出し線１０３が高圧引き下げ線１０４を介して或いは直接に高圧幹線１０５に接続されると共に下部の口出し線１０６が変圧器の一次側接続端子１０７にそれぞれ接続されている。
【０００３】
ところで、耐塩用の円筒形高圧カットアウト１０２は、海岸線或いはそれに近い地区において使用されるもので、そのため上部の口出し線１０３及び下部の口出し線１０６は、その接続金具及び電線の外周（詳しくは口出し線の接続金具と芯線）がＥＰＴゴム等のゴム絶縁物で被覆された上にさらに電位傾度を緩和するため該絶縁物が円錐形状のストレスコーン状に形成されている。つまり、ストレスコーン形の口出し線構造になっている。
【０００４】
【発明が解決しようとする課題】
しかしながら上記したように耐塩用の円筒形カットアウトは海岸線等のように冬季に強風が吹く地帯で使用される機会が多いため、特に風圧或いは振動などにより口出し線が揺動し、それが繰り返されるとストレスコーン部の先端部、つまり、ストレスコーン部と電線部分の境界部分に揺動時の荷重が繰り返し集中し、ついにはその部分の口出し線の芯線が切断するという事故が発生する。
【０００５】
【課題を解決するための手段】
本願発明は、上記の風圧或いは振動などに起因して発生する円筒形高圧カットアウトの口出し線の芯線切れ事故に鑑み、これを防止せんとする補強構造に関するもので、
第１の発明は、下端部がストレスコーンに固定され、撓むことができるようにした補強カバーを有するものであって、前記補強カバーが、体内に貫通する挿入穴を形成する筒状に形成され、その上端部の肉厚を下端部より薄肉に形成し、下端部を、下方が拡開するテーパ状であって該部の挿入穴をカットアウトの口出し線のストレスコーン部に密着するテーパ面に形成するとともに該下端部の肉厚を上端部より厚肉に形成した弾性部材からなり、その補強カバーを、その挿入穴を通じて前記口出し線に挿通して、該補強カバーの下端を前記口出し線側のストレスコーン部の先端より少し根元側の位置迄被さるようにし、その挿入穴の下部テーパ面を上記ストレスコーン部に密着させ、その補強カバーの上端部を口出し線に対してテープでテーピング固定し、補強カバーの拡径された下端部をストレスコーン部に対してテープでテーピング固定したことを特徴とする円筒形高圧カットアウトの口出し線の補強構造である。
【０００６】
また、第２の発明は、上記第１の発明において、補強カバーを構成する部材がゴム素材からなり、その硬度が約６５°のものであることを特徴とする円筒形高圧カットアウトの上部口出し線の補強構造である。
【０００７】
また、第３の発明は、上記第１又は第２の発明において、補強カバーの外周面に、その上端部から下端部に至る補強リブを、周方向に適宜間隔を保って複数形成したことを特徴とする円筒形高圧カットアウトの口出し線の補強構造である。
【０００８】
【発明の実施の形態】
次に、図１乃至図８に示す実施例に基づいて本発明の実施の形態を説明する。
１は大略円筒形に形成した絶縁部材からなる補強カバーであり、例えば、難燃性ＥＰＲ（エチレンプロピレンラバー）、難燃性ＥＰＴ（エチレンプロピレンタートリマー）等からなるもので、そのゴム硬度が４０°〜８０°のものが使用される。このほか該補強カバー１の材質としては適度な弾性を有する絶縁性の合成樹脂も使用可能である。
【０００９】
上記補強カバー１はその全体が円錐形のストレスコーン形に形成されており、貫通孔からなる挿入孔２は下端４側から上端３側付近迄は同孔２に挿入される口出し線７の被覆５の直径Ａより若干大き目の孔径Ｂに形成されており、また同孔２に続くようにしてその下端４側には円筒形高圧カットアウト６の上部側の口出し線７のストレスコーン部８の外周形状と一致し、そのゴム絶縁物８ａの上から密着するようにした下端側に行く程外側に拡開するテーパ面９ａを形成したストレスコーン形の拡径部９が形成されている。
【００１０】
補強カバー１の上端部、すなわち電線保持部１１の肉厚は、先細状にして薄肉に形成されて撓みやすくなっており、また、補強カバー１における電線保持部１１と反対側に位置する拡径部９及びその付近部分においては電線保持部１１とは逆に厚肉に形成されていて適度の強度を有し、撓み難くなっている。
【００１１】
１０は外周面上に形成した縦筋状の補強リブであり、同リブ１０は上端３つまり電線保持部１１から下端４つまり、拡径部９に至るカバーのほぼ全長に渡って形成されており、かつ、上部は、電線保持部１１側に行く程その高さが低くなって電線保持部１１側が撓みやすくなっている。また、該補強リブ１０は、複数本、補強カバー１の周方向に適宜間隔を有して設けられており、図の実施例では４本設けられている。
【００１２】
１５は電線保持部によりやや下方に位置して形成したテープの位置決め用リブを示す。また、１６は口出し線７の芯線、１７は接続金具、１８は本体１２に対し口出し線７をネジ着するためのボルト、１９はナット、２０はワッシャーをそれぞれ示す。
【００１３】
次に上記補強カバー１の取付方法について説明する。
取付対象のカットアウト６の上部の口出し線７を高圧引き下げ線（図１０における１０４）から切り離し、切り離した上部の口出し線７に対し同カバー１を、その拡径部９側を先（下）にしてその挿入孔２を通じて挿入する。挿入すると電線保持部１１側に口出し線７の先端側が少し突出するため、その先端部分を持ちながらカバー１を口出し線７の根元側、つまりストレスコーン部８側に押し下げるようにして移動させる。この押し下げにより、同カバー１のストレスコーン形の拡径部９の下端、つまりカバーの下端４が口出し線７側のストレスコーン部８の先端Ｃより少し根元側の位置迄被さり、該拡径部９がゴム絶縁物８ａの上から密着する。このようにして比較的厚肉で適度の強度を有する拡径部９が、カットアウト側の本体１２に一体的に接着固定された口出し線７側のストレスコーン部８に対し密着してしっかりと固定されることになる。
【００１４】
このようにして同カバーの拡径部９側が口出し線７側のストレスコーン部８に挿着（密着）した状態において、反対側の電線保持部１１側を口出し線７にテープ１３によりテーピング固定する。電線保持部１１側のテーピングが終われば、拡径部９側についてもテープ１３でテーピングを行う。この両端のテーピングに使用するテープ１３は口出し線７や補強カバー１と同じ難燃性ＥＰＲ（エチレンプロピレンラバー）、難燃性ＥＰＴ（エチレンプロピレンタートリマー）と同様の自己融着形のものが使用されるもので、巻き付け処理するに際しては補強カバー１内に雨水等が侵入しないようにすると同時に同カバー１が確実に口出し線７に固定されるようにすることが必要である。
【００１５】
なお、取付対象のカットアウトが既設品（取付使用状態）でなく新品の場合は組み立て時或いは組み立て終了時に同様にして補強カバーを口出し線に取り付けるようにする。また、上記はカットアウトの上部の口出し線７への取付を中心に説明したが、当然、下部の口出し線１４についても芯線切れ対策が必要な場合には同様に下部の口出し線１４に対し補強カバー１を取り付ける。
【００１６】
次に上記のように補強カバーを取り付けた本願発明品の場合と補強カバーを取り付けない現状品について図６（ａ）、（ｂ）のように取り付け、また、表１に示す試験条件にて振動試験を行い確認した処、表２の結果になった。
【００１７】
【表１】

【００１８】
【表２】

【００１９】
結果を示す表２において、Ｎｏ１は補強カバーを取り付けないもの、Ｎｏ２は補強カバーを取り付けたもので、補強カバーのゴム硬度が４０°、Ｎｏ３はゴム硬度が６５゜、Ｎｏ４はゴム硬度８０゜のものをそれぞれ示す。
【００２０】
その結果、補強カバーを取り付けたＮｏ２、Ｎｏ３、Ｎｏ４の本願発明品は補強カバーを取り付けないＮｏ１の現状品に比較して芯線切れに至る時間で比較すると３．６倍〜１９．２倍の耐振性があることが判る。また、本願発明品の中でも硬度が大きいＮｏ４と硬度が小さいＮｏ２のものは、硬度がこれらの中間にあるＮｏ３のものに比して耐振性が劣っていることも判る。
【００２１】
つまり、上記の結果から補強カバーを取り付けた場合は、補強カバー１の下端４の拡径部９がカットアウト側の口出し線７のストレスコーン部８側に対し絶縁物８ａ上から被さるようにして密着固定すると共に同カバーの上端３の撓み易い電線保持部１１側が電線の被覆５上から密着するようになっているため、強風時に風圧或いは振動が補強カバー１に加わってカットアウト側のストレスコーン部８の端部の芯線１６における符号Ｃの部分に対してこれが加わろうとしてもこの力を補強カバー１がストレスコーン部の絶縁物８にてがっちりと受け止め、また電線支持部１１側で撓みながら吸収するため芯線５のＣの箇所には過度に荷重が加わらず、そのため芯線切れする迄の時間が長くなるものと考える。
【００２２】
また、上記試験結果ではＮｏ３のように硬度６５゜のものが特に優れた結果となったが、これは硬度８０゜の場合は加振されたときにゴムの撓みが少なくなってカバーで吸収できず荷重が直接口出し線のストレスコーンの芯線部に加わるため芯線切れ迄の時間が短くなるものと考えられ、また、硬度４０°の場合は補強カバーの撓みが大きくなり過ぎて荷重を補強カバー１で吸収できず芯線切れ迄の時間が短くなるものと考えられる。つまり、補強カバー１のゴム硬度が口出し線の芯線切れ迄の時間を決める大きな要因になっていて、重要であることが判る。
【００２３】
なお、本願発明の補強カバー１を実際の装柱状態で取り付けて確認した処、上記試験結果と同様な結果が得られ、口出し線の芯線切れに対し充分効果を有することが判明した。
【００２４】
図７及び図８は、本願発明の異なった実施例の補強カバー１ｅを示すもので、上記実施例の補強カバー１における補強リブ１０が形成されていない点以外は上記実施例と同様の構造であり、芯線切れについては同様の防止効果が当然期待できるものである。図中、上記実施例と同一部分については上記実施例の符号にｅを付して表した。
【００２５】
【発明の効果】
以上のように本願発明の補強カバー構造は、その補強カバーの一端の拡径部がカットアウト側の口出し線のストレスコーン部側の絶縁物上から被さるようにして密着固定し、また他端の撓み易い電線保持部側が電線の被覆上から密着するようにして取り付けられているため、強風時に風圧或いは振動による過度で繰り返される荷重がカットアウトの口出し線に対し加わっても、補強カバーの拡径部側によりがっちりと受け止め、また電線支持部側で撓みながら吸収するため、カットアウト側のストレスコーンの端部の芯線に対しは上記荷重が加わり難くくなり、そのために芯線切れ防止が確実に行える。
【００２６】
更に、円筒形高圧カットアウトの口出し線の絶縁物の上から挿入し、所定に位の位置においてその両端をテーピングするだけの簡単な取り付けで良く而も補強カバー自体が安価な部材で構成されているため、作業性が良いと同時に経済的である。
【図面の簡単な説明】
【図１】本願発明の実施例を示す補強カバーの正面図。
【図２】本願発明の補強カバーを円筒形高圧カットアウトの上部の口出し線に取り付けた状態の要部断面図。
【図３】図１のＸ−Ｘ線断面図。
【図４】図１の平面図。
【図５】図１の底面図。
【図６】（ａ）、（ｂ）は試験状態を示す概略図。
【図７】本願発明の補強カバーの異なった実施例の正面図。
【図８】図７のＹ−Ｙ線断面図。
【図９】円筒形高圧カットアウトの使用状態を示す概略装柱図。
【図１０】同じく円筒形高圧カットアウトの使用状態を示す装柱図。
【符号の説明】
１補強カバー
２挿入孔
３上端
４下端
５被覆
６、１０２円筒形高圧カットアウト
７、１０３上部の口出し線
８ストレスコーン部
８ａゴム絶縁物
９拡径部
１０補強リブ
１１電線保持部
１２本体
１３テープ
１４、１０６下部の口出し線
１６芯線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for a lead wire of a cylindrical high-pressure cutout, and is particularly intended to prevent core wire breakage.
[0002]
[Prior art]
As shown in FIGS. 9 and 10, the cylindrical high-voltage cutout 102 used for protecting the high-voltage primary side of the pole transformer 100 (101) has a lead wire 103 at its upper part via a high-voltage pull-down wire 104 or Directly connected to the high-voltage main line 105, and the lower lead wire 106 is connected to the primary side connection terminal 107 of the transformer.
[0003]
By the way, the salt-resistant cylindrical high-pressure cutout 102 is used on the coastline or in an area close to the coastline. Therefore, the upper lead wire 103 and the lower lead wire 106 are connected to the outer periphery of the connection fitting and the electric wire (more specifically, the lead wire). The wire connecting fitting and the core wire) are covered with a rubber insulator such as EPT rubber, and the insulator is formed in a conical stress cone shape to further reduce the potential gradient. That is, it has a stress cone-shaped lead wire structure.
[0004]
[Problems to be solved by the invention]
However, as mentioned above, salt-resistant cylindrical cutouts are often used in areas where strong winds blow in the winter, such as coastlines. And the load at the time of swinging repeatedly concentrates on the tip part of the stress cone part, that is, the boundary part between the stress cone part and the electric wire part, and finally an accident occurs in which the core wire of the lead wire of that part is cut.
[0005]
[Means for Solving the Problems]
The present invention relates to a reinforcing structure which prevents this in view of the core wire breakage accident of the lead wire of the cylindrical high-pressure cutout generated due to the wind pressure or vibration described above,
1st invention has a reinforcement cover which the lower end part was fixed to the stress cone, and was able to bend, Comprising: The said reinforcement cover is formed in the cylinder shape which forms the insertion hole penetrated in a body The upper end portion is formed thinner than the lower end portion, and the lower end portion is a tapered shape that expands downward, and the insertion hole of the portion is in close contact with the stress cone portion of the lead-out line of the cutout Ri Do an elastic member formed in the thick of the upper end portion of the thickness of the lower end portion so as to form on the surface, the reinforcing cover, is inserted into the lead wire through the insertion hole, wherein the lower end of the reinforcing cover Cover the stress cone part on the lead wire side to a position slightly closer to the root side , closely contact the lower tapered surface of the insertion hole with the stress cone part, and tape the upper end of the reinforcing cover to the lead line. The And ring fixed, a reinforcement structure of a lead wire of the cylindrical high pressure cutout, characterized in that the taping taped to stress cone portion of enlarged diameter has been lower end of the reinforcement cover.
[0006]
According to a second aspect of the present invention, in the first aspect of the present invention, the member constituting the reinforcing cover is made of a rubber material and has a hardness of about 65 °. It is a reinforcement structure of a wire.
[0007]
Moreover, the third invention is that in the first or second invention, a plurality of reinforcing ribs extending from the upper end portion to the lower end portion are formed on the outer peripheral surface of the reinforcing cover at appropriate intervals in the circumferential direction. It is the reinforcement structure of the lead wire of the cylindrical high-pressure cutout characterized.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described based on the examples shown in FIGS.
Reference numeral 1 denotes a reinforcing cover made of an insulating member formed in a substantially cylindrical shape, and is made of, for example, flame retardant EPR (ethylene propylene rubber), flame retardant EPT (ethylene propylene tertrimer), etc., and its rubber hardness is 40 Those having a temperature of 80 ° to 80 ° are used. In addition, as the material of the reinforcing cover 1, an insulating synthetic resin having appropriate elasticity can be used.
[0009]
The entire reinforcing cover 1 is formed in a conical stress cone shape, and the insertion hole 2 formed of a through hole covers the lead wire 7 inserted into the hole 2 from the lower end 4 side to the upper end 3 side. 5 is formed with a diameter B slightly larger than the diameter A, and the lower end 4 side of the hole 2 is formed at the upper end of the lead wire 7 on the upper side of the cylindrical high-pressure cutout 6 so as to follow the hole 2. A stress cone-shaped enlarged diameter portion 9 is formed which has a taper surface 9a that expands outward as it goes to the lower end side, which coincides with the outer peripheral shape and is in close contact with the rubber insulator 8a.
[0010]
The thickness of the upper end portion of the reinforcing cover 1, that is, the wire holding portion 11, is tapered to be thin and easy to bend, and the diameter of the reinforcing cover 1 on the side opposite to the wire holding portion 11 is increased. In the portion 9 and its vicinity, the wire holding portion 11 is formed to be thick opposite to the wire holding portion 11, has an appropriate strength, and is difficult to bend.
[0011]
Reference numeral 10 denotes a longitudinal reinforcing rib formed on the outer peripheral surface, and the rib 10 is formed over almost the entire length of the cover from the upper end 3, that is, the wire holding portion 11, to the lower end 4, that is, the enlarged diameter portion 9. And the height becomes low, and the electric wire holding part 11 side becomes easy to bend, so that the upper part goes to the electric wire holding part 11 side. A plurality of the reinforcing ribs 10 are provided at appropriate intervals in the circumferential direction of the reinforcing cover 1, and four reinforcing ribs 10 are provided in the illustrated embodiment.
[0012]
Reference numeral 15 denotes a tape positioning rib formed slightly below the wire holding portion. Reference numeral 16 denotes a core wire of the

lead wire

7, 17 denotes a connection fitting, 18 denotes a bolt for screwing the lead wire 7 to the

main body

12, 19 denotes a nut, and 20 denotes a washer.
[0013]
Next, a method for attaching the reinforcing cover 1 will be described.
The upper lead wire 7 of the cutout 6 to be attached is cut off from the high pressure pull-down line (104 in FIG. 10), and the cover 1 is cut from the upper lead wire 7 thus cut off, and the enlarged diameter portion 9 side is first (lower). Then, it is inserted through the insertion hole 2. When inserted, the tip end side of the lead wire 7 slightly protrudes toward the electric wire holding portion 11 side, so that the cover 1 is moved while being pushed down to the root side of the lead wire 7, that is, the stress cone portion 8 side while holding the tip portion. By this depression, the lower end of the stress cone-shaped enlarged diameter portion 9 of the cover 1, that is, the lower end 4 of the cover is covered to a position slightly closer to the root side than the tip C of the stress cone portion 8 on the lead wire 7 side. 9 adheres from above the rubber insulator 8a. In this way, the enlarged-diameter portion 9 having a relatively thick wall and appropriate strength is in close contact with the stress cone portion 8 on the lead wire 7 side which is integrally bonded and fixed to the main body 12 on the cutout side. It will be fixed.
[0014]
In this manner, in a state where the enlarged diameter portion 9 side of the cover is inserted (closely attached) to the stress cone portion 8 on the lead wire 7 side, the opposite wire holding portion 11 side is fixed to the lead wire 7 with the tape 13. . When the taping on the side of the electric wire holding part 11 is completed, the tape 13 is also used for the enlarged diameter part 9 side. The tape 13 used for the taping at both ends is the same as the lead wire 7 and the reinforcing cover 1, which is the same as the flame retardant EPR (ethylene propylene rubber) and flame retardant EPT (ethylene propylene tertrimer). Therefore, when performing the winding process, it is necessary to prevent rainwater or the like from entering the reinforcing cover 1 and at the same time to ensure that the cover 1 is fixed to the lead wire 7.
[0015]
If the cut-out to be attached is not an existing product (installation use state) but a new one, the reinforcing cover is attached to the lead wire in the same manner at the time of assembly or at the end of assembly. Although the above description has focused on the attachment of the cutout to the upper lead wire 7, naturally the lower lead wire 14 is similarly reinforced to the lower lead wire 14 when measures for disconnection of the core wire are required. Install the cover 1.
[0016]
Next, in the case of the present invention product with the reinforcing cover attached as described above and the current product without the reinforcing cover attached as shown in FIGS. 6 (a) and 6 (b), and vibration is performed under the test conditions shown in Table 1. As a result of testing and confirmation, the results shown in Table 2 were obtained.
[0017]
[Table 1]

[0018]
[Table 2]

[0019]
In Table 2 showing the results, No1 is a case where a reinforcing cover is not attached, No2 is a case where a reinforcing cover is attached, the reinforcing cover has a rubber hardness of 40 °, No3 has a rubber hardness of 65 °, and No4 has a rubber hardness of 80 °. Each one is shown.
[0020]
As a result, the No. 2, No. 3 and No. 4 products of the present invention with the reinforcing cover attached are 3.6 times to 19.2 times the vibration resistance when compared with the current product of No. 1 with no reinforcing cover, compared to the time to core break. It turns out that there is sex. Moreover, it can also be seen that, among the products of the present invention, those having No. 4 having high hardness and No. 2 having low hardness are inferior in vibration resistance compared to those having No. 3 in the middle.
[0021]
That is, when the reinforcing cover is attached from the above result, the enlarged diameter portion 9 of the lower end 4 of the reinforcing cover 1 is covered from the insulator 8a on the stress cone portion 8 side of the lead-out wire 7 on the cutout side. Since the electric wire holding part 11 side of the upper end 3 of the cover that is easily bent is in close contact with the electric wire covering 5, wind pressure or vibration is applied to the reinforcing cover 1 in a strong wind and the stress cone on the cutout side Even if this is applied to the portion C of the core wire 16 at the end of the portion 8, this force is firmly received by the reinforcing cover 1 by the insulator 8 of the stress cone portion and is bent on the wire support portion 11 side. In order to absorb, it is considered that an excessive load is not applied to the portion C of the core wire 5, so that the time until the core wire is cut off is increased.
[0022]
In addition, in the above test results, those with a hardness of 65 ° as in No. 3 showed particularly excellent results. However, when the hardness is 80 °, the bending of the rubber is reduced when it is vibrated and can be absorbed by the cover. It is thought that the time until the core wire breaks is shortened because the load is directly applied to the core portion of the stress cone of the lead wire, and when the hardness is 40 °, the bending of the reinforcing cover becomes too large and the load is applied to the reinforcing cover 1 It is thought that the time until the core wire is cut is shortened because of the fact that it cannot be absorbed. That is, it can be seen that the rubber hardness of the reinforcing cover 1 is a significant factor that determines the time until the lead wire breaks, and is important.
[0023]
In addition, when the reinforcing cover 1 of the present invention was installed and confirmed in an actual column state, the same result as the above test result was obtained, and it was found that the lead wire was sufficiently effective against the core wire breakage.
[0024]
7 and 8 show a reinforcing cover 1e according to another embodiment of the present invention. The reinforcing cover 1e has the same structure as that of the above embodiment except that the reinforcing rib 10 is not formed in the reinforcing cover 1 of the above embodiment. Yes, the same prevention effect can naturally be expected for the core wire breakage. In the figure, the same parts as those of the above embodiment are represented by adding e to the reference numerals of the above embodiment.
[0025]
【The invention's effect】
As described above, the reinforcing cover structure of the present invention is closely fixed so that the enlarged diameter portion of one end of the reinforcing cover covers the insulator on the stress cone portion side of the lead-out wire on the cutout side, and the other end Since the wire holding part side that is easy to bend is attached so as to be in close contact with the covering of the wire, the diameter of the reinforcing cover can be expanded even if excessively repeated load due to wind pressure or vibration is applied to the cutout lead line in strong winds Since it absorbs more firmly on the part side and absorbs while bending on the wire support part side, it becomes difficult to apply the above load to the core wire at the end of the stress cone on the cutout side, so it is possible to reliably prevent core wire breakage .
[0026]
Furthermore, it can be installed simply by inserting it from above the insulation of the lead wire of the cylindrical high-pressure cutout and taping both ends at predetermined positions, and the reinforcement cover itself is made of an inexpensive member. Therefore, workability is good and economical.
[Brief description of the drawings]
FIG. 1 is a front view of a reinforcing cover showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an essential part in a state in which a reinforcing cover according to the present invention is attached to an upper lead wire of a cylindrical high-pressure cutout.
3 is a cross-sectional view taken along line XX in FIG.
4 is a plan view of FIG. 1. FIG.
FIG. 5 is a bottom view of FIG. 1;
6A and 6B are schematic views showing a test state.
FIG. 7 is a front view of a different embodiment of the reinforcing cover of the present invention.
8 is a cross-sectional view taken along line YY in FIG.
FIG. 9 is a schematic column diagram showing a use state of a cylindrical high-pressure cutout.
FIG. 10 is a column diagram showing a usage state of a cylindrical high-pressure cutout.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement cover 2 Insertion hole 3 Upper end 4 Lower end 5 Covering 6, 102 Cylindrical

high pressure cutout

7, 103 Upper lead wire 8 Stress cone part 8a Rubber insulator 9 Expanded part 10 Reinforcement rib 11 Electric wire holding part 12 Main body 13

Tape

14, 106 Lower lead wire 16 core wire

Claims

The lower end portion is fixed to the stress cone and has a reinforcing cover that can be bent, and the reinforcing cover is formed in a cylindrical shape that forms an insertion hole penetrating into the body, and the upper end portion The wall thickness is made thinner than the lower end, and the lower end is tapered so that the lower part expands, and the insertion hole of the part is formed on a tapered surface that is in close contact with the stress cone part of the cutout lead line. Ri Do the thickness of the lower end of an elastic member formed thicker than the top portion, the reinforcing cover, is inserted into the lead wire through the insertion hole, the reinforcing stress cone lower end of the lead wire side of the cover parts as covers up little root side position from the tip of the lower tapered surface of the insertion hole is brought into close contact with the stress cone portion, taping and tape the upper portion of the reinforcement cover against lead wire, Reinforcing structure of output wire of the cylindrical high pressure cutout, characterized in that the taping taped to stress cone portion of enlarged diameter has been lower end of the strong cover.

The reinforcing structure of the upper lead wire of the cylindrical high-pressure cutout according to claim 1, wherein the member constituting the reinforcing cover is made of a rubber material and has a hardness of about 65 °.

The opening of the cylindrical high-pressure cutout according to claim 1 or 2, wherein a plurality of reinforcing ribs extending from the upper end portion to the lower end portion are formed on the outer peripheral surface of the reinforcing cover at appropriate intervals in the circumferential direction. Line reinforcement structure.