JP2002330533A - Linear connecting part of power cable - Google Patents
Linear connecting part of power cableInfo
- Publication number
- JP2002330533A JP2002330533A JP2001135395A JP2001135395A JP2002330533A JP 2002330533 A JP2002330533 A JP 2002330533A JP 2001135395 A JP2001135395 A JP 2001135395A JP 2001135395 A JP2001135395 A JP 2001135395A JP 2002330533 A JP2002330533 A JP 2002330533A
- Authority
- JP
- Japan
- Prior art keywords
- peripheral surface
- cable
- inner peripheral
- sleeve
- internal electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明に係る電力ケーブル
の直線接続部は、架橋ポリエチレン絶縁電力ケーブル
（ＣＶケーブル）等の高圧電力ケーブルを構成するケー
ブル導体の端部同士を接続する為に使用する。BACKGROUND OF THE INVENTION 1. Field of the Invention The linear connecting portion of a power cable according to the present invention is used for connecting ends of cable conductors constituting a high-voltage power cable such as a crosslinked polyethylene insulated power cable (CV cable).
【０００２】[0002]
【従来の技術】高圧電力ケーブルの端部同士の接続作業
を比較的容易に行なえる構造として、弾性材であるゴム
により造った常温収縮型絶縁体（プレモールドスリー
ブ）により、１対の電力ケーブルを構成するケーブル導
体同士の接続部を覆う構造が知られている。図４は、こ
の様な常温収縮型絶縁体を使用する電力ケーブルの直線
接続部の１例を示している。2. Description of the Related Art A pair of power cables is provided by a room-temperature shrinkable insulator (pre-mold sleeve) made of rubber, which is an elastic material, as a structure which enables relatively easy connection between ends of a high-voltage power cable. There is known a structure for covering a connecting portion between cable conductors constituting the above. FIG. 4 shows an example of a linear connection portion of a power cable using such a cold-shrinkable insulator.
【０００３】互いに接続すべき１対の電力ケーブル１、
１は、それぞれがケーブル導体２の周囲をケーブル絶縁
体３により被覆して成る。これら１対の電力ケーブル
１、１のケーブル導体２、２の端部でそれぞれ上記ケー
ブル絶縁体３、３から突出した部分同士は、接続スリー
ブ４により接続している。この接続スリーブ４は、銅系
或はアルミニウム系の合金等、軟らかく塑性変形させ易
い金属により、軸方向中間部を仕切られた円筒状に形成
されている。この様な接続スリーブ４により上記１対の
電力ケーブル１、１のケーブル導体２、２同士を接続す
るには、これら両ケーブル導体２、２の端部を上記接続
スリーブ４内に、この接続スリーブ４の両端開口から挿
入した後、ダイス等の加工機を使用する事により、この
接続スリーブ４に径方向内方に向いた強い力を加えて、
この接続スリーブ４を縮径させる。そして、この接続ス
リーブ４の両端部内周面と上記各ケーブル導体２、２の
端部外周面とを強く当接させて、これら両ケーブル導体
２、２同士を接続する。[0003] A pair of power cables 1 to be connected to each other,
1 comprises a cable conductor 2 covered with a cable insulator 3. Portions of the pair of power cables 1 and 1 protruding from the cable insulators 3 at ends of the cable conductors 2 and 2 are connected by a connection sleeve 4. The connection sleeve 4 is formed of a soft metal that is easily deformed plastically, such as a copper-based or aluminum-based alloy, and is formed in a cylindrical shape with an intermediate portion in the axial direction. In order to connect the cable conductors 2 and 2 of the pair of power cables 1 and 1 with the connection sleeve 4, the ends of the cable conductors 2 and 2 are inserted into the connection sleeve 4. After inserting from both ends opening of 4, by using a processing machine such as a die, a strong force directed inward in the radial direction is applied to this connection sleeve 4.
The diameter of the connection sleeve 4 is reduced. Then, the inner peripheral surfaces of both ends of the connection sleeve 4 and the outer peripheral surfaces of the end portions of the respective cable conductors 2 and 2 are brought into strong contact with each other to connect the two cable conductors 2 and 2 to each other.
【０００４】この様にして接続スリーブ４により互いに
接続した、上記１対の電力ケーブル１、１の端部同士の
間には、常温収縮型絶縁体である常温収縮チューブ５を
掛け渡し、この常温収縮チューブ５により、上記接続ス
リーブ４及び上記各ケーブル導体２、２の端部でこの接
続スリーブ４及び上記ケーブル絶縁体３、３から露出し
た部分を覆っている。この常温収縮チューブ５は、ゴム
により円筒状に構成されたもので、絶縁性を有するゴム
製の絶縁筒部６の軸方向中間位置の内周面部分に、半導
電性を有するゴム製の内部電極７を包埋している。これ
に対して、上記絶縁筒部６の外周面は、半導電性を有す
るゴム製の外部電極８により覆っている。[0004] Between the ends of the pair of power cables 1 and 1 connected to each other by the connecting sleeve 4 in this manner, a cold shrinkable tube 5 which is a cold shrinkable insulator is passed over. The end portions of the connection sleeve 4 and the cable conductors 2 and 2 cover the portions exposed from the connection sleeve 4 and the cable insulators 3 and 3 with the shrink tube 5. The cold shrinkable tube 5 is made of rubber and has a cylindrical shape, and a semiconductive rubber inner portion is provided on an inner peripheral surface portion of the insulating rubber cylindrical portion 6 having an insulating property at an intermediate position in the axial direction. The electrode 7 is embedded. On the other hand, the outer peripheral surface of the insulating cylindrical portion 6 is covered with a semiconductive rubber external electrode 8.
【０００５】上述の様な常温収縮チューブ５は、上記１
対の電力ケーブル１、１のケーブル導体２、２の端部同
士を接続スリーブ４により接続するのに先立って、何れ
か一方の電力ケーブル１に予め緩く外嵌しておく。尚、
上記常温収縮チューブ５の内径側には、この常温収縮チ
ューブ５を拡径状態に保持する為の円筒状の保持スリー
ブが、工場若しくは現場で、予め挿入されている。従っ
て、この常温収縮チューブ５は、縮径方向の弾力を付与
された状態とされている。そして、上記１対の電力ケー
ブル１、１のケーブル導体２、２の端部同士を接続スリ
ーブ４により接続した後、上記常温収縮チューブ５を、
上記１対の電力ケーブル１、１を構成するケーブル絶縁
体３、３同士の間に掛け渡す位置に移動させてから、上
記保持スリーブを上記常温収縮チューブ５の内径側から
抜き取る。[0005] The cold shrinkable tube 5 as described above comprises
Prior to connecting the ends of the cable conductors 2, 2 of the pair of power cables 1, 1 with the connection sleeve 4, they are loosely fitted to one of the power cables 1 in advance. still,
A cylindrical holding sleeve for holding the cold-shrinkable tube 5 in an expanded state is previously inserted into the inside diameter side of the cold-shrinkable tube 5 at a factory or a site. Therefore, the cold shrinkable tube 5 is in a state where elasticity in the diameter reducing direction is given. Then, after the ends of the cable conductors 2 and 2 of the pair of power cables 1 and 1 are connected to each other by a connection sleeve 4, the cold shrinkable tube 5 is
After being moved to a position where it is bridged between the cable insulators 3 constituting the pair of power cables 1, 1, the holding sleeve is removed from the inner diameter side of the cold shrinkable tube 5.
【０００６】この様にして保持スリーブを常温収縮チュ
ーブ５の内径側から抜き取る事に伴い、この常温収縮チ
ューブ５が自身の弾性により縮径し、前記外部電極８の
両端部内周面が上記各電力ケーブル１、１を構成するケ
ーブル絶縁体３、３の外側に設けたシールド層９、９の
外周面に当接し、前記内部電極７の内周面が上記接続ス
リーブ４に対向し、前記絶縁筒部６の内周面が上記各電
力ケーブル１、１を構成するケーブル絶縁体３、３の端
部外周面に当接する。[0006] As the holding sleeve is pulled out from the inner diameter side of the cold shrink tube 5 in this manner, the cold shrink tube 5 is reduced in diameter by its own elasticity, and the inner peripheral surfaces of both ends of the external electrode 8 are subjected to the above-mentioned electric power. The outer peripheral surfaces of the shield layers 9, 9 provided outside the cable insulators 3, 3 constituting the cables 1, 1 are in contact with each other, the inner peripheral surface of the internal electrode 7 faces the connection sleeve 4, and the insulating cylinder The inner peripheral surface of the portion 6 abuts on the outer peripheral surface of the end of the cable insulators 3 constituting the power cables 1.
【０００７】上述の図４に示した電力ケーブルの直線接
続部の場合には、上記内部電極７の内周面と、上記接続
スリーブ４の外周面及び上記各ケーブル導体２、２の端
部でこの接続スリーブ４及び上記ケーブル絶縁体３、３
から露出した部分の外周面との間に、円筒状の隙間が存
在する。これに対し、電力ケーブルの直線接続部の特性
を向上させる為には、上記内部電極７と上記接続スリー
ブ４とを互いに導通させて同電位にし、且つ、上記隙間
を導電性を有する材料により塞ぐ事により、上記隙間部
分で電界の乱れが生じるのを防止するのが好ましい。[0007] In the case of the straight-line connection portion of the power cable shown in FIG. 4, the inner peripheral surface of the internal electrode 7, the outer peripheral surface of the connection sleeve 4, and the ends of the cable conductors 2, 2 are used. The connection sleeve 4 and the cable insulators 3, 3
There is a cylindrical gap between the outer peripheral surface of the portion exposed from the outer surface. On the other hand, in order to improve the characteristics of the linear connection portion of the power cable, the internal electrode 7 and the connection sleeve 4 are made conductive to each other to have the same potential, and the gap is closed with a conductive material. Accordingly, it is preferable to prevent the electric field from being disturbed in the gap.
【０００８】この様な事情に鑑みて従来から、図５に示
す様に、上記内部電極７の内周面と、上記接続スリーブ
４の外周面及び上記各ケーブル導体２、２の端部でこの
接続スリーブ４及び上記ケーブル絶縁体３、３から露出
した部分の外周面との間に存在する円筒状の隙間を、半
導電性テープ層１０により塞ぐ事が行なわれている。こ
の様な直線接続部の場合には、上記内部電極７と上記接
続スリーブ４とが上記半導電性テープ層１０を介して導
通し、これら内部電極７と接続スリーブ４とが同電位に
なり、且つ、上記円筒状の隙間が上記半導電性テープ層
１０により塞がれる。この為、上記円筒状の隙間部分で
電界の乱れが生じるのを防止でき、直線接続部の特性を
向上させる事ができる。In view of such circumstances, conventionally, as shown in FIG. 5, the inner peripheral surface of the inner electrode 7, the outer peripheral surface of the connection sleeve 4, and the ends of the cable conductors 2, 2 have A cylindrical gap existing between the connection sleeve 4 and the outer peripheral surface of the portion exposed from the cable insulators 3 is closed by a semiconductive tape layer 10. In the case of such a linear connection portion, the internal electrode 7 and the connection sleeve 4 conduct through the semiconductive tape layer 10, and the internal electrode 7 and the connection sleeve 4 have the same potential. In addition, the cylindrical gap is closed by the semiconductive tape layer 10. For this reason, it is possible to prevent the electric field from being disturbed in the cylindrical gap, and to improve the characteristics of the linear connection portion.
【０００９】[0009]
【発明が解決しようとする課題】ところが、上述の図５
に示した電力ケーブルの直線接続部の場合には、上記半
導電性テープ層１０を形成する作業、即ち、上記接続ス
リーブ４の外周面及び上記各ケーブル導体２、２の端部
でこの接続スリーブ４及び上記ケーブル絶縁体３、３か
ら露出した部分の外周面に、半導電性テープを巻回する
作業が面倒である。そして、この様に半導電性テープ層
１０を形成する作業が面倒である分、直線接続部の組立
作業性が悪化する。本発明は、上述の様な事情に鑑み
て、組立作業性を悪化させる事なく特性の向上を図れ
る、電力ケーブルの直線接続部を実現すべく発明したも
のである。However, FIG.
In the case of the straight-line connection part of the power cable shown in FIG. 1, the operation of forming the semiconductive tape layer 10, that is, the connection sleeve 4 at the outer peripheral surface of the connection sleeve 4 and the end of each of the cable conductors 2, 2 The operation | work which winds a semiconductive tape on the outer peripheral surface of the part exposed from 4 and the said cable insulators 3 and 3 is troublesome. And since the operation | work which forms the semiconductive tape layer 10 in this way is troublesome, the assembly workability of a linear connection part deteriorates. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has been made to realize a straight-line connection portion of a power cable, which can improve characteristics without deteriorating assembly workability.
【００１０】[0010]
【課題を解決するための手段】本発明の電力ケーブルの
直線接続部は、前述した従来から知られている電力ケー
ブルの直線接続部と同様に、それぞれがケーブル導体の
周囲をケーブル絶縁体により被覆して成る、互いに接続
すべき１対の電力ケーブルと、これら各電力ケーブルの
ケーブル導体の端部でそれぞれ上記ケーブル絶縁体から
突出した部分同士を接続する接続スリーブと、弾性材に
より筒状に構成され、その両端部内周面を上記各電力ケ
ーブルのケーブル絶縁体の端部外周面に弾性的に当接さ
せ、その中間部内周面を上記接続スリーブに対向させた
常温収縮型絶縁体とを備える。又、この常温収縮型絶縁
体は、絶縁性を有する弾性材製の絶縁筒部の軸方向中間
位置の内周面部分に、半導電性を有する弾性材製の内部
電極を包埋したものである。特に、本発明の電力ケーブ
ルの直線接続部に於いては、上記内部電極の中間部内周
面のうち少なくとも上記接続スリーブの外周面と径方向
に関して対向する部分に、この内部電極の内周面から径
方向内方に突出して上記各ケーブル絶縁体の軸方向端面
同士の間に進入する小径凸部を全周に亙って形成し、こ
の小径凸部の内周面を上記接続スリーブの外周面に全周
に亙って弾性的に当接させる事により、この接続スリー
ブと上記内部電極とを導通させている。The linear connection portions of the power cable of the present invention are each covered with a cable insulator around a cable conductor, similarly to the above-described linear connection portion of a conventionally known power cable. A pair of power cables to be connected to each other, a connection sleeve for connecting portions protruding from the cable insulator at ends of the cable conductors of these power cables, and a tubular shape made of an elastic material. A cold-shrinkable insulator whose inner peripheral surfaces at both ends are elastically brought into contact with outer peripheral surfaces at the ends of the cable insulator of each of the power cables, and whose inner peripheral surface is opposed to the connection sleeve. . In addition, this cold-shrinkable insulator is one in which an inner electrode made of a semiconductive elastic material is embedded in an inner peripheral surface portion at an axially intermediate position of an insulating cylindrical portion made of an elastic material having insulating properties. is there. In particular, in the straight connection portion of the power cable according to the present invention, at least a portion of the inner peripheral surface of the intermediate portion of the internal electrode that is radially opposed to the outer peripheral surface of the connection sleeve from the inner peripheral surface of the internal electrode. A small-diameter convex portion protruding radially inward and entering between the axial end surfaces of the cable insulators is formed over the entire circumference, and the inner peripheral surface of the small-diameter convex portion is formed on the outer peripheral surface of the connection sleeve. The connection sleeve and the internal electrode are electrically connected by elastically contacting the connection sleeve over the entire circumference.
【００１１】[0011]
【作用】上述の様に構成する本発明の電力ケーブルの直
線接続部の場合には、内部電極の中間部内周面に設けた
小径凸部の内周面を接続スリーブの外周面に、全周に亙
って弾性的に当接させる事により、これら内部電極と接
続スリーブとを導通させている。この為、これら内部電
極と接続スリーブとを同電位にできると共に、これら内
部電極の内周面と接続スリーブの外周面との間の隙間を
なくす事ができる。この為、これら内部電極の内周面と
接続スリーブの外周面との間で発生する電界の乱れを抑
える事ができ、電力ケーブルの直線接続部の特性を向上
させる事ができる。In the case of the straight connection portion of the power cable of the present invention configured as described above, the inner peripheral surface of the small-diameter convex portion provided on the inner peripheral surface of the intermediate portion of the internal electrode is formed on the outer peripheral surface of the connection sleeve. The internal electrodes and the connection sleeve are electrically connected by elastically contacting over the entire range. Therefore, the potential of the internal electrode and the connection sleeve can be set to the same potential, and a gap between the inner peripheral surface of the internal electrode and the outer peripheral surface of the connection sleeve can be eliminated. Therefore, disturbance of the electric field generated between the inner peripheral surface of these internal electrodes and the outer peripheral surface of the connection sleeve can be suppressed, and the characteristics of the linear connection portion of the power cable can be improved.
【００１２】又、本発明の場合、上記小径凸部の内周面
を上記接続スリーブの外周面に弾性的に当接させる作業
は、直線接続部の組み立て時に、常温収縮型絶縁体の内
側から、この常温収縮型絶縁体を拡径状態に保持する為
の保持スリーブを抜き取るのみで良い。即ち、この保持
スリーブを抜き取る事に伴い、この常温収縮型絶縁体が
自身の弾性により縮径し、上記両周面同士が当接する。
上記保持スリーブの抜き取り作業は、元々必要な作業で
ある為、上記小径凸部の内周面と上記接続スリーブの外
周面とを当接させる事に伴って、直線接続部の組立作業
性が悪化する事はない。In the case of the present invention, the operation of elastically contacting the inner peripheral surface of the small-diameter convex portion with the outer peripheral surface of the connection sleeve is performed from the inside of the cold-shrinkable insulator at the time of assembling the linear connection portion. It is only necessary to pull out the holding sleeve for holding the room-temperature shrinkable insulator in the expanded state. That is, as the holding sleeve is pulled out, the cold shrinkable insulator is reduced in diameter by its own elasticity, and the two peripheral surfaces come into contact with each other.
Since the work of extracting the holding sleeve is originally necessary, the workability of assembling the linear connecting part is deteriorated due to the contact between the inner peripheral surface of the small-diameter convex portion and the outer peripheral surface of the connection sleeve. Nothing to do.
【００１３】[0013]
【発明の実施の形態】図１〜３は、本発明の実施の形態
の１例を示している。尚、本例の特徴は、常温収縮型絶
縁体である常温収縮チューブ５ａを構成する内部電極７
ａの構造にある。その他の部分の構造及び作用は、前述
の図１に示した従来構造の場合と同様である為、重複す
る部分の説明は省略若しくは簡略にし、以下、本発明の
特徴部分並びに上記従来構造と異なる部分を中心に説明
する。1 to 3 show an example of an embodiment of the present invention. The feature of this example is that the internal electrodes 7 constituting the cold-shrinkable tube 5a, which is a cold-shrinkable insulator.
a. Since the structure and operation of the other parts are the same as those of the conventional structure shown in FIG. 1 described above, the description of the overlapping parts will be omitted or simplified, and the characteristic parts of the present invention and the above-described conventional structure will be different. The description will focus on the parts.
【００１４】上記内部電極７ａの中間部内周面で、１対
の電力ケーブル１、１を構成するケーブル導体２、２の
端部同士を接続する接続スリーブ４の外周面と直径方向
に関して対向する部分には、径方向内方に突出する小径
凸部１１を、全周に亙って設けている。そして、この小
径凸部１１の内周面を上記接続スリーブ４の外周面に、
全周に亙って弾性的に当接させる事により、上記内部電
極７ａと上記接続スリーブ４とを導通させている。本例
の場合、この様に小径凸部１１の内周面を上記接続スリ
ーブ４の外周面に全周に亙って弾性的に当接させる為
に、自由状態での上記小径凸部１１の内径寸法ｄ11（図
２）を、上記接続スリーブ４の外径寸法Ｄ 4 （図１）よ
りも少し小さくしている。The inner peripheral surface of the intermediate portion of the internal electrode 7a has one pair.
Of the cable conductors 2 and 2 constituting the power cables 1 and 1
Outer peripheral surface of connecting sleeve 4 for connecting the ends and diametrical direction
The small diameter projecting inward in the radial direction
The protrusion 11 is provided over the entire circumference. And this small
The inner peripheral surface of the radial projection 11 is attached to the outer peripheral surface of the connection sleeve 4.
By making it elastically contact over the entire circumference,
The pole 7a is electrically connected to the connection sleeve 4. This example
In this case, the inner peripheral surface of the small-diameter convex portion 11 is
To make the outer peripheral surface of the probe 4 abut elastically over the entire circumference
The inner diameter d of the small-diameter convex portion 11 in a free state11(Figure
2) is changed to the outer diameter D of the connection sleeve 4. Four (Fig. 1)
A little smaller.
【００１５】上述の様に小径凸部１１の内周面を接続ス
リーブ４の外周面に弾性的に当接させる作業は、電力ケ
ーブルの直線接続部の組み立て時に、前記常温収縮チュ
ーブ５ａの内側から、この常温収縮チューブ５ａを拡径
状態に保持する為の保持スリーブ１２（図３）を抜き取
る事により行なう。即ち、この保持スリーブ１２の抜き
取りに伴い、この常温収縮チューブ５ａが自身の弾性に
より縮径し、上記小径凸部１１の内周面と上記接続スリ
ーブ４の外周面とが当接する。上記常温収縮チューブ５
ａを所定位置に移動させてから上記保持スリーブ１２を
抜き取る作業は、元々必要な作業であるから、上記両周
面同士を当接させる為に、余分な手間が必要になる事は
ない。尚、本例の場合、上記保持スリーブ１２は、図３
に示す様に、１対のスリーブ素子１３、１３の一端縁同
士を互いに突き合わせて成る。これら各スリーブ素子１
３、１３は、大径部１４と小径部１５とを段部１６で連
続させた段付円筒状としている。上記保持スリーブ１２
は、それぞれがこの様な形状を有する１対のスリーブ素
子１３、１３の小径部１５側の先端縁同士を、互いに突
き合わせた状態で分離可能に組み合わせて成る。そし
て、この様な保持スリーブ１２を上記常温収縮チューブ
５ａの内側に挿入した状態で、この常温収縮チューブ５
ａのうち上記小径凸部１１を形成した軸方向中間部を上
記各小径部１５、１５により、上記常温収縮チューブ５
ａのうち上記小径凸部１１から軸方向に外れた軸方向両
側部分を、上記各大径部１４、１４により、それぞれ拡
径保持自在としている。As described above, the work of elastically contacting the inner peripheral surface of the small-diameter convex portion 11 with the outer peripheral surface of the connection sleeve 4 is performed from the inside of the cold shrink tube 5a at the time of assembling the linear connection portion of the power cable. This is performed by extracting the holding sleeve 12 (FIG. 3) for holding the room-temperature shrinkable tube 5a in the expanded state. That is, as the holding sleeve 12 is removed, the cold shrinkable tube 5a contracts due to its own elasticity, and the inner peripheral surface of the small-diameter convex portion 11 and the outer peripheral surface of the connection sleeve 4 come into contact with each other. The cold shrinkable tube 5
Since the operation of removing the holding sleeve 12 after moving a to a predetermined position is an originally necessary operation, no extra labor is required for bringing the two peripheral surfaces into contact with each other. In the case of the present example, the holding sleeve 12 is provided as shown in FIG.
As shown in FIG. 2, one end of a pair of sleeve elements 13 is abutted against each other. Each of these sleeve elements 1
Reference numerals 3 and 13 each have a stepped cylindrical shape in which a large-diameter portion 14 and a small-diameter portion 15 are connected by a step portion 16. The holding sleeve 12
Is formed by combining the pair of sleeve elements 13, 13 each having such a shape such that their leading edges on the small-diameter portion 15 side can be separated from each other in a state where they abut against each other. Then, with such a holding sleeve 12 inserted inside the cold shrink tube 5a, the cold shrink tube 5
The middle part in the axial direction, in which the small-diameter convex portion 11 is formed, is formed by the small-diameter portions 15 and 15 into the cold-shrinkable tube 5.
The large-diameter portions 14, 14 a, of which a portion in the axial direction deviates in the axial direction from the small-diameter convex portion 11, can be expanded and held, respectively.
【００１６】本例の場合、上記保持スリーブ１２を上記
常温収縮チューブ５ａの内側から抜き取る作業は、上記
小径凸部１１を上記接続スリーブ４の外径側に配置した
状態で、上記１対のスリーブ素子１３、１３を互いに離
れる方向に移動させる事により行なう。この様に１対の
スリーブ素子１３、１３を互いに離れる方向に移動させ
ると、上記常温収縮チューブ５ａが軸方向中央部分から
軸方向両端部に向け、順次弾性的に縮径する。この結
果、上記小径凸部１１が前記１対の電力ケーブル１、１
を構成するケーブル絶縁体３、３の軸方向端面同士の間
に径方向外方から進入し、上記小径凸部１１の内周面が
上記接続スリーブ４の外周面に全周に亙って弾性的に当
接する。尚、本例の場合、上述の様な抜き取り作業の際
に、上記各スリーブ素子１３、１３の一部が上記小径凸
部１１の軸方向両端面と干渉する事はない。この為、上
述の様な抜き取り作業の際に、上記小径凸部１１が破損
する事はない。In the case of this embodiment, the operation of extracting the holding sleeve 12 from the inside of the cold-shrinkable tube 5a is performed in a state where the small-diameter convex portion 11 is arranged on the outer diameter side of the connection sleeve 4. This is performed by moving the elements 13 and 13 away from each other. When the pair of sleeve elements 13 and 13 are moved away from each other in this manner, the cold shrinkable tube 5a sequentially and elastically contracts in diameter from the central portion in the axial direction to both ends in the axial direction. As a result, the small-diameter convex portion 11 is connected to the pair of power cables 1, 1.
Between the axial end faces of the cable insulators 3 constituting the cable sleeve 3 from outside in the radial direction, and the inner peripheral surface of the small-diameter convex portion 11 is elastically attached to the outer peripheral surface of the connection sleeve 4 over the entire circumference. Contact. In the case of this example, at the time of the above-described extraction work, a part of each of the sleeve elements 13 does not interfere with the axial end faces of the small-diameter convex portion 11. For this reason, the small-diameter convex portion 11 is not damaged during the above-described extraction work.
【００１７】上述の様に構成する本例の電力ケーブルの
直線接続部の場合には、内部電極７ａの中間部内周面に
設けた小径凸部１１の内周面を接続スリーブ４の外周面
に、全周に亙って弾性的に当接させる事により、これら
内部電極７ａと接続スリーブ４とを導通させている。こ
の為、これら内部電極７ａと接続スリーブ４とを同電位
にできると共に、これら内部電極７ａの内周面と接続ス
リーブ４の外周面との間の隙間を少なくする事ができ
る。この為、これら内部電極７ａの内周面と接続スリー
ブ４の外周面との間で生じる電界の乱れを抑える事がで
き、電力ケーブルの直線接続部の特性を向上させる事が
できる。In the case of the straight-line connecting portion of the power cable of the present embodiment configured as described above, the inner peripheral surface of the small-diameter convex portion 11 provided on the inner peripheral surface of the intermediate portion of the internal electrode 7a is connected to the outer peripheral surface of the connection sleeve 4. The internal electrodes 7a and the connection sleeves 4 are electrically connected to each other by elastic contact over the entire circumference. Therefore, the potential of the internal electrode 7a and the connection sleeve 4 can be set to the same potential, and the gap between the inner peripheral surface of the internal electrode 7a and the outer peripheral surface of the connection sleeve 4 can be reduced. Therefore, disturbance of the electric field generated between the inner peripheral surface of the internal electrode 7a and the outer peripheral surface of the connection sleeve 4 can be suppressed, and the characteristics of the linear connection portion of the power cable can be improved.
【００１８】又、上記小径凸部１１の内周面を上記接続
スリーブ４の外周面に弾性的に当接させる作業は、直線
接続部の組み立て時に、常温収縮チューブ５ａの内側か
ら保持スリーブ１２を抜き取る事に伴い、この常温収縮
チューブ５ａを自身の弾性により縮径させる事で、容易
に行なえる。この為、前述した様に余分な手間は不要で
あり、直線接続部の組立作業性が悪化する事はない。The operation of elastically contacting the inner peripheral surface of the small-diameter convex portion 11 with the outer peripheral surface of the connection sleeve 4 is performed by assembling the holding sleeve 12 from the inside of the cold-shrinkable tube 5a at the time of assembling the linear connection portion. This can be easily performed by reducing the diameter of the room-temperature shrinkable tube 5a by its own elasticity as it is extracted. For this reason, as described above, no extra labor is required, and the workability of assembling the straight connection portion does not deteriorate.
【００１９】尚、本発明を実施する場合に、直線接続部
の特性を十分に向上させる為には、内部電極の内周面に
設ける小径凸部の軸方向寸法を大きくする事により、こ
の内部電極の内周面と、各ケーブル導体の端部で接続ス
リーブ及びケーブル絶縁体から露出した部分の外周面と
の間に存在する隙間をできるだけ小さくして、この隙間
部分で生じる電界の乱れを十分に小さくするのが好まし
い。In implementing the present invention, in order to sufficiently improve the characteristics of the linear connecting portion, the axial dimension of the small-diameter convex portion provided on the inner peripheral surface of the internal electrode is increased. The gap existing between the inner peripheral surface of the electrode and the outer peripheral surface of the portion exposed from the connection sleeve and the cable insulator at the end of each cable conductor is made as small as possible, and the electric field disturbance generated in this gap is sufficiently reduced. It is preferable to make it smaller.
【００２０】[0020]
【発明の効果】本発明の電力ケーブルの直線接続部は、
以上に述べた通り構成され作用する為、組立作業性を悪
化させる事なく、特性の向上を図る事ができる。この
為、信頼性の高い電力ケーブルの直線接続部を短い時間
で組み立てる事ができて、良質の配電設備を低コストで
実現できる。The straight-line connecting portion of the power cable of the present invention
Since the configuration and operation are performed as described above, the characteristics can be improved without deteriorating the assembly workability. For this reason, it is possible to assemble a highly reliable straight-line connection portion of the power cable in a short time, and to realize high-quality power distribution equipment at low cost.
【図１】本発明の実施の形態の１例を示す半部断面図。FIG. 1 is a half sectional view showing an example of an embodiment of the present invention.
【図２】自由状態で示す、常温収縮チューブの断面図。FIG. 2 is a cross-sectional view of the cold-shrinkable tube shown in a free state.
【図３】常温収縮チューブの内径側に、この常温収縮チ
ューブを拡径状態に保持する為の保持スリーブを挿入し
た状態を示す断面図。FIG. 3 is a cross-sectional view showing a state in which a holding sleeve for holding the cold shrinkable tube in an expanded state is inserted into the inner diameter side of the cold shrinkable tube.
【図４】従来構造の第１例を示す断面図。FIG. 4 is a sectional view showing a first example of a conventional structure.
【図５】同第２例を示す断面図。FIG. 5 is a sectional view showing the second example.
１ 電力ケーブル ２ ケーブル導体 ３ ケーブル絶縁体 ４ 接続スリーブ ５、５ａ 常温収縮チューブ ６ 絶縁筒部 ７、７ａ 内部電極 ８ 外部電極 ９ シールド層 １０ 半導電性テープ層 １１ 小径凸部 １２ 保持スリーブ １３ スリーブ素子 １４ 大径部 １５ 小径部 １６ 段部 REFERENCE SIGNS LIST 1 power cable 2 cable conductor 3 cable insulator 4 connection sleeve 5, 5 a cold shrink tube 6 insulating cylinder 7, 7 a internal electrode 8 external electrode 9 shield layer 10 semiconductive tape layer 11 small diameter convex part 12 holding sleeve 13 sleeve element 14 Large diameter part 15 Small diameter part 16 Step
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5G355 AA03 BA01 BA14 5G375 AA02 BA26 BB43 CA02 CA14 CB07 CB19 CB38 CB47 CB53 DB32 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G355 AA03 BA01 BA14 5G375 AA02 BA26 BB43 CA02 CA14 CB07 CB19 CB38 CB47 CB53 DB32
Claims (1)
ル絶縁体により被覆して成る、互いに接続すべき１対の
電力ケーブルと、これら各電力ケーブルのケーブル導体
の端部でそれぞれ上記ケーブル絶縁体から突出した部分
同士を接続する接続スリーブと、弾性材により筒状に構
成され、その両端部内周面を上記各電力ケーブルのケー
ブル絶縁体の端部外周面に弾性的に当接させ、その中間
部内周面を上記接続スリーブに対向させた常温収縮型絶
縁体とを備え、この常温収縮型絶縁体は、絶縁性を有す
る弾性材製の絶縁筒部の軸方向中間位置の内周面部分
に、半導電性を有する弾性材製の内部電極を包埋したも
のである電力ケーブルの直線接続部に於いて、この内部
電極の中間部内周面のうち少なくとも上記接続スリーブ
の外周面と径方向に関して対向する部分に、この内部電
極の内周面から径方向内方に突出して上記各ケーブル絶
縁体の軸方向端面同士の間に進入する小径凸部を全周に
亙って形成し、この小径凸部の内周面を上記接続スリー
ブの外周面に全周に亙って弾性的に当接させる事によ
り、この接続スリーブと上記内部電極とを導通させた事
を特徴とする電力ケーブルの直線接続部。1. A pair of power cables to be connected to each other, each of which is covered by a cable insulator around a cable conductor, and each of the power cables protruding from the cable insulator at an end of the cable conductor. And a connecting sleeve for connecting the connected portions to each other, and a cylindrical shape made of an elastic material, the inner peripheral surfaces of both ends of which are elastically brought into contact with the outer peripheral surfaces of the ends of the cable insulators of the respective power cables, and the inner peripheral surface thereof is formed. A cold-shrinkable insulator whose surface is opposed to the connection sleeve, wherein the cold-shrinkable insulator is provided on an inner peripheral surface portion of the insulating cylinder portion made of an elastic material having an insulating property at an intermediate position in the axial direction. In a linear connection portion of a power cable in which an internal electrode made of an elastic material having conductivity is embedded, at least a portion of an inner peripheral surface of an intermediate portion of the internal electrode is radially related to an outer peripheral surface of the connection sleeve. A small-diameter convex portion projecting radially inward from the inner peripheral surface of the internal electrode and entering between the axial end surfaces of the respective cable insulators is formed over the entire periphery at the opposed portion, A power cable characterized in that the inner peripheral surface of the small-diameter convex portion is elastically brought into contact with the outer peripheral surface of the connection sleeve over the entire circumference, thereby electrically connecting the connection sleeve and the internal electrode. Straight connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135395A JP2002330533A (en) | 2001-05-02 | 2001-05-02 | Linear connecting part of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135395A JP2002330533A (en) | 2001-05-02 | 2001-05-02 | Linear connecting part of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002330533A true JP2002330533A (en) | 2002-11-15 |
Family
ID=18982868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001135395A Pending JP2002330533A (en) | 2001-05-02 | 2001-05-02 | Linear connecting part of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002330533A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009106014A (en) * | 2007-10-22 | 2009-05-14 | Viscas Corp | Power cable connecting part and conductor connecting pipe |
| JP2011239494A (en) * | 2010-05-06 | 2011-11-24 | Furukawa Electric Co Ltd:The | Plug-in connection body for power cable and connecting method using the same |
| JP2019193515A (en) * | 2018-04-27 | 2019-10-31 | 昭和電線ケーブルシステム株式会社 | Cable connection part |
-
2001
- 2001-05-02 JP JP2001135395A patent/JP2002330533A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009106014A (en) * | 2007-10-22 | 2009-05-14 | Viscas Corp | Power cable connecting part and conductor connecting pipe |
| JP2011239494A (en) * | 2010-05-06 | 2011-11-24 | Furukawa Electric Co Ltd:The | Plug-in connection body for power cable and connecting method using the same |
| JP2019193515A (en) * | 2018-04-27 | 2019-10-31 | 昭和電線ケーブルシステム株式会社 | Cable connection part |
| JP7015730B2 (en) | 2018-04-27 | 2022-02-03 | 昭和電線ケーブルシステム株式会社 | Cable connection |
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