JPS5915222Y2 - Rubber or plastic insulated power cable connections - Google Patents

Description

【考案の詳細な説明】 本考案はゴムまたはプラスチック絶縁型カケープル接続
部の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement to a rubber or plastic insulated cable connection.

従来のゴムまたはプラスチック絶縁型カケープルの接続
は、接続すべきケーブルの心線を露出せしめた絶縁体端
末を鉛筆削りし、両心線をスリーブ接続したのち該スリ
ーブ接続部からケーブル絶縁体上に亘すゴム又はプラス
チックテープを巻きあげていた。Conventional rubber or plastic insulated cable connections are made by sharpening the insulator end that exposes the core wire of the cable to be connected, connecting both core wires with a sleeve, and then extending from the sleeve connection portion onto the cable insulator. It was wrapped in rubber or plastic tape.

しかしながらこのテープ巻き接続部はテープ巻き量が多
いこと、テープ巻きあげを均一な張力で行なわねばなら
ないこと、および鉛筆削りやスリーブ接続部の仕上げに
熟練を要し接続に長時間を費やす欠点があった。However, this tape-wrapped joint has the disadvantages that a large amount of tape is wound, that the tape must be wound with uniform tension, and that it requires skill in sharpening the pencil and finishing the sleeve joint, and that it takes a long time to connect. Ta.

この欠点を補うためプラスチックで成形した絶縁補強筒
を予め用意し、この補強絶縁筒をスリーブ接続部上に挿
着して構成する接続部が開発されているが電圧が２２
ＫＶ、６６ ＫＶクラスとなると耐電圧特性を満足させ
るために絶縁補強筒の絶縁厚を厚くしなければならず、
大型の注型絶縁筒が必要となる。In order to compensate for this drawback, a connection part has been developed in which an insulating reinforcing cylinder molded from plastic is prepared in advance and this reinforcing insulating cylinder is inserted onto the sleeve connection part, but the voltage is 22.
KV, 66 KV class, the insulation thickness of the insulation reinforcing tube must be increased to satisfy the withstand voltage characteristics.
A large cast insulating cylinder is required.

ところが大型の注型絶縁筒を耐電圧特性が低下しないよ
う全長均一に製造することは極めて困難であり、また接
続部組立てにあたっても絶縁筒が大型であると心線接続
部上に挿着するのに大きな労力が必要で人手では組立不
可能な場合も生じ、さらにケーブル寸法と絶縁筒内径と
の寸法公差を厳密にしないと、この界面隙間から絶縁破
壊を起すなどの欠点があった。However, it is extremely difficult to manufacture a large cast-molded insulating tube with a uniform length so as not to reduce its withstand voltage characteristics, and when assembling the connection part, if the insulating cylinder is large, it will be difficult to insert it onto the core wire connection part. This requires a large amount of labor and may not be possible to assemble by hand.Furthermore, unless the dimensional tolerance between the cable dimensions and the inside diameter of the insulating cylinder is made strict, there are drawbacks such as dielectric breakdown occurring from this interfacial gap.

また心線のスリーブ接続部上に遮蔽電極を配置しその上
に絶縁テープを巻きあげ、ケーブル絶縁体端末の鉛筆削
りを省略するタイプの接続部も考案されているが、この
種接続部ではテープを遮蔽電極上に巻くため界面にテー
プの巻回が残り、このテープ巻回にできるボイドのため
に電気特性を向上せしめることができない欠点があった
。In addition, a type of connection has been devised in which a shielding electrode is placed on the sleeve connection of the core wire and an insulating tape is wound on top of the shield electrode, and the need to sharpen the pencil at the end of the cable insulator is omitted. Since the tape is wound on the shielding electrode, a winding of the tape remains at the interface, and the voids formed in the winding of the tape have the disadvantage that the electrical characteristics cannot be improved.

本考案はかかる従来の諸欠点を解消せしめたもので、以
下これを図示した実施例について説明するに、第１図に
おいて１はケーブル導体相互を接続したスリーブ、２は
弾力性を有するゴム又はプラスチックからなり内側に内
部遮蔽電極３を埋込んだ薄い注型絶縁筒、４は自己融着
性テープをテンションを加えて巻回して設けた絶縁補強
層で、予め工場内で前記絶縁筒２の内径をケーブル絶縁
体の外径よりやや小さ目に、かつ内部に埋設する遮蔽電
極３が、接続された両ケーブル絶縁体端にまたがる長さ
に成形し、該絶縁筒２を導体を露出した一方のケーブル
へ挿入しておき、両ケーブル相互の導体をスリーブ１で
圧縮接続した後、前記絶縁筒２をスリーブ１上に引戻し
内部遮蔽電極３の端末がケーブル絶縁体端にまたがるよ
うに、且つ内部遮蔽電極３とスリーブ１とを接触子３′
を介し電気的に接続して固定する。The present invention has solved these conventional drawbacks, and an embodiment illustrating the same will be described below. In FIG. 4 is an insulating reinforcing layer formed by winding a self-adhesive tape under tension, and the inner diameter of the insulating cylinder 2 is preset in the factory. The shielding electrode 3 embedded inside the cable insulator is slightly smaller than the outer diameter of the cable insulator, and the shielding electrode 3 is formed to have a length that spans the ends of both connected cable insulators, and the insulating tube 2 is connected to one of the cables with the conductor exposed. After the conductors of both cables are compressed and connected with the sleeve 1, the insulating tube 2 is pulled back onto the sleeve 1 so that the end of the internal shielding electrode 3 straddles the end of the cable insulator, and the internal shielding electrode 3 and sleeve 1 to contact 3'
Connect and fix electrically through the

然るのち絶縁筒２上にエチレンプロピレンゴム系等の自
己融着性テープをこれにある程度のテンションを加えな
がら巻回して絶縁補強層４を形成する。Thereafter, a self-adhesive tape made of ethylene propylene rubber or the like is wound around the insulating cylinder 2 while applying a certain amount of tension to form the insulating reinforcing layer 4.

この絶縁補強層４の形成によって絶縁筒２には外側から
収縮力が加わり絶縁筒２の内周面とケーブル絶縁体との
界面は完全に密着し界面の電気特性は著しく向上する。By forming the insulation reinforcing layer 4, a contraction force is applied to the insulation cylinder 2 from the outside, and the interface between the inner circumferential surface of the insulation cylinder 2 and the cable insulator is completely adhered, and the electrical characteristics of the interface are significantly improved.

次いで、絶縁補強層４上に外部遮蔽電極５、接続箱７を
設け、最終的に接続箱７内の空隙に絶縁コンパウンド６
を充填する。Next, an external shielding electrode 5 and a junction box 7 are provided on the insulation reinforcing layer 4, and finally an insulating compound 6 is placed in the gap inside the junction box 7.
Fill it with.

第２図は上記のように構成した第１図に示す接続部にお
ける絶縁補強層４の両端スロープ立上り部分を、予め工
場成形の電極８を埋設した弾性体ストレスコーン９で構
成し、絶縁破壊の生じ易い部分を工場成形品で置きかえ
電気特性をより一層向上せしめたものである。FIG. 2 shows that the slope rising portions at both ends of the insulation reinforcing layer 4 in the connection part shown in FIG. The electrical characteristics were further improved by replacing the easily-prone parts with factory-molded parts.

なお図中１０はおさえテープ巻層、１１はストレスコー
ン固定具、１２は連結装置である。In the figure, 10 is a pressure tape winding layer, 11 is a stress cone fixing device, and 12 is a connecting device.

本考案は上述のように遮蔽電極３を埋込んだ弾性絶縁筒
２と、テンションを加えて巻回してなる自己融着性テー
プ巻回絶縁補強層４とで接続部を構成したので、スリー
ブ接続した導体露出部分は絶縁筒２に埋設の電極３によ
って電気的に保護され、且つ絶縁筒２は肉厚の薄いもの
で足りるので絶縁筒は伸縮性に富み工場製作および現場
挿着作業が極めて容易である。In the present invention, as described above, the connection part is composed of the elastic insulating tube 2 in which the shielding electrode 3 is embedded and the insulating reinforcing layer 4 wound with self-adhesive tape, which is wound under tension. The exposed part of the conductor is electrically protected by the electrode 3 embedded in the insulating tube 2, and since the insulating tube 2 only needs to be thin, the insulating tube has excellent elasticity and is extremely easy to manufacture in a factory and to install on-site. It is.

また絶縁筒２の外周に巻回する自己融着性テープの巻回
締めつけ力で絶縁筒の内周面がケーブル絶縁体上に完全
に密着し細隙間を生じないから界面の絶縁耐力が著しく
向上する。In addition, due to the winding tightening force of the self-adhesive tape wound around the outer circumference of the insulating tube 2, the inner peripheral surface of the insulating tube is completely adhered to the cable insulator, and no small gaps are created, so the dielectric strength of the interface is significantly improved. do.

さらにまた絶縁筒２上に巻回する絶縁テープは電界の集
中しない部分であるためテープ巻作業に熟練技術を要し
ないから電気的特性の安定した接続部を容易にうろこと
ができる。Furthermore, since the insulating tape wound on the insulating cylinder 2 is a part where electric fields are not concentrated, no skilled technique is required for the tape winding operation, and therefore a connection part with stable electrical characteristics can be easily obtained.

なお接続部を構成する絶縁筒２の絶縁材として、その上
に巻回するテープの誘電率より大きい誘電率の絶縁材を
使用することで内部遮蔽電極３の直上にかかる最大スト
レスを大巾に低減しうるなどの優れた利点がある。In addition, by using an insulating material with a dielectric constant higher than that of the tape wound on the insulating tube 2 constituting the connection part, the maximum stress applied directly above the internal shielding electrode 3 can be greatly reduced. It has excellent advantages such as being able to reduce

次に本考案接続部の具体例を示す。Next, a specific example of the connecting portion of the present invention will be shown.

半導電性ＥＰＲ製内部遮蔽電極３を内側に埋設したＥＰ
Ｒモールド絶縁筒、２及び半導電性シリコン製内部遮蔽
電極３を内側に埋込んだシリコン注型モールド絶縁筒２
の二種類を用意し、絶縁筒上に巻回する自己融着性テー
プとしてＥＰＲ系絶縁テープと、ポリエチレンに粘着層
をはり合せたテープを用意して各々を組合せて６６ Ｋ
Ｖ級Ｃｖケーブルの接続部を構成して、交流破壊試験を
行った結果、いづれもその破壊電圧は２３０ ＫＶ組以
上あった。EP with semiconductive EPR internal shielding electrode 3 buried inside
R-molded insulating tube 2 and silicone cast molded insulating tube 2 with semiconductive silicon internal shielding electrode 3 embedded inside.
We prepared two types of tape: an EPR-based insulating tape as a self-adhesive tape to be wrapped around an insulating cylinder, and a tape made of polyethylene with an adhesive layer, and combined them to produce a 66K tape.
As a result of conducting an AC breakdown test on the connection parts of V-class Cv cables, the breakdown voltage was 230 KV or more in all cases.

而してこれを解体しケーブル絶縁体と絶縁筒２との界面
の絶縁破壊状況を調査したが破壊は皆無であった。This was then dismantled and the state of dielectric breakdown at the interface between the cable insulator and the insulating tube 2 was investigated, but no breakdown was found.

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

第１図は本考案接続部の実施例を示す説明図、第２図は
本考案の他の実施例を示す説明図である。 １＝スリーブ、２＝絶縁筒、３−内部遮蔽電極、４＝絶
縁補強層、５＝外部遮蔽電極、６ニコンパウンド、７＝
接続箱、８＝電極、９＝ストレスコーン、１０＝テ一プ
巻層。FIG. 1 is an explanatory diagram showing an embodiment of the connecting portion of the present invention, and FIG. 2 is an explanatory diagram showing another embodiment of the present invention. 1=Sleeve, 2=Insulating cylinder, 3-Inner shielding electrode, 4=Insulating reinforcing layer, 5=External shielding electrode, 6 Ni compound, 7=
Junction box, 8 = electrode, 9 = stress cone, 10 = tape winding layer.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] スリーブ接続した両ケーブル絶縁体端にまたがらせて導
体接続部上に被せた遮蔽電極埋込弾性絶縁筒と、該弾性
絶縁筒外周にテンションを加えて自己融着性テープを巻
回して形成した絶縁補強層とからなることを特徴とする
ゴム又はプラスチック絶縁型カケープル接続部。An elastic insulating tube with a shielding electrode embedded therein is placed over the conductor connection portion by straddling the ends of both cable insulators connected to the sleeve, and a self-fusing tape is wound around the outer periphery of the elastic insulating tube under tension. A rubber or plastic insulated cable connection part characterized by comprising an insulating reinforcing layer.