JP2002281652A - Terminal connection part for power cable - Google Patents
Terminal connection part for power cableInfo
- Publication number
- JP2002281652A JP2002281652A JP2001080685A JP2001080685A JP2002281652A JP 2002281652 A JP2002281652 A JP 2002281652A JP 2001080685 A JP2001080685 A JP 2001080685A JP 2001080685 A JP2001080685 A JP 2001080685A JP 2002281652 A JP2002281652 A JP 2002281652A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- cable
- electric field
- power cable
- high dielectric
- 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
Landscapes
- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＣＶケ−ブル等の
プラスチック絶縁電力ケ−ブル用終端接続部に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connection for a plastic insulated power cable such as a CV cable.
【０００２】[0002]
【従来の技術】近年、配電用ＣＶケ−ブル等のプラスチ
ック絶縁電力ケ−ブル用終端接続部は、コンパクト化、
及び作業性改良の要求により、従来用いられていたスト
レスレリ−フコ−ンタイプに代えて、ケ−ブル絶縁層の
誘電率より大きい誘電率を有するいわゆる高誘電率材料
により構成された円筒状電界緩和層が用いられている。2. Description of the Related Art In recent years, terminal connection parts for plastic insulated power cables such as CV cables for power distribution have been reduced in size.
In response to a demand for improved workability, a cylindrical electric field relaxation made of a so-called high dielectric constant material having a dielectric constant larger than the dielectric constant of the cable insulating layer instead of the conventionally used stress relief cone type. Layers are used.
【０００３】図６は従来の電力ケ−ブル用終端接続部に
おける要部縦断面図である。ケ−ブル導体１の上に設け
られたケ−ブル絶縁層２と、このケ−ブル絶縁層２の上
に設けられたケ−ブル外部半導電層４を段剥ぎ露出さ
せ、前記ケ−ブル絶縁層２と外部半導電層４の上に円筒
状電界緩和層３を設けたものである。又、外部半導電層
４の上には遮蔽層５、防食層６が順にそれぞれ設けられ
ており、これらも段剥ぎされている。この円筒状電界緩
和層３を電界が集中する外部半導電層４の切断端部を覆
うように装着することで、電界が緩和される。FIG. 6 is a vertical sectional view of a main part of a conventional power cable terminal connection section. The cable insulating layer 2 provided on the cable conductor 1 and the cable external semiconductive layer 4 provided on the cable insulating layer 2 are peeled off and exposed. A cylindrical electric field relaxation layer 3 is provided on an insulating layer 2 and an external semiconductive layer 4. A shielding layer 5 and an anticorrosion layer 6 are provided on the outer semiconductive layer 4 in this order, and these are also stripped off. By mounting the cylindrical electric field relaxation layer 3 so as to cover the cut end of the external semiconductive layer 4 where the electric field is concentrated, the electric field is reduced.
【０００４】[0004]
【発明が解決しょうとする課題】この高誘電率材料によ
り構成された円筒状電界緩和層３は、従来のストレスレ
リ−フコ−ンタイプに比べ薄肉化が可能となり、コンパ
クト化が実現できる。しかし、外部半導電層４の切断端
部に空隙があると電界緩和が不十分となり、この部分に
部分放電が発生しやすくなるという問題は解決されな
い。The cylindrical electric field relaxation layer 3 made of this high dielectric constant material can be made thinner and more compact than the conventional stress relief type. However, if there is a gap at the cut end of the external semiconductive layer 4, the electric field is insufficiently relaxed, and the problem that partial discharge easily occurs in this portion is not solved.
【０００５】外部半導電層４の切断端部は、図６のＡ部
を拡大した図７に示すとおり、外部半導電層４の厚みに
より空隙部７が生じる。この空隙部７があると、この部
分に電界が集中するため、部分放電が発生しやすい状況
となり、部分放電が発生すると絶縁層２が劣化し、最悪
の場合絶縁破壊に至る場合がある。At the cut end of the external semiconductive layer 4, a gap 7 is formed due to the thickness of the external semiconductive layer 4, as shown in FIG. If the gap 7 is present, the electric field concentrates in this portion, so that the partial discharge is likely to occur. When the partial discharge occurs, the insulating layer 2 is deteriorated, and in the worst case, the dielectric breakdown may be caused.
【０００６】[0006]
【課題を解決するための手段】本発明は上記課題を解消
するもので、円筒状電界緩和層を有する電力ケ−ブル用
終端接続部において、ケ−ブル絶縁層とケ−ブル外部半
導電層を段剥ぎ露出させ、前記円筒状電界緩和層は高誘
電率部と導電部とを一体化してなり、前記高誘電率部は
前記ケ−ブル絶縁層に接し、前記導電部は前記ケ−ブル
絶縁層と前記ケ−ブル外部半導電層とに跨ってそれぞれ
接するように設けたものである。このようにすることに
より、外部半導電層の切断端部にたとえ空隙部が存在し
たとしても、その空隙部を導電部で覆うことにより空隙
部への電界集中を防止することができる。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a power cable termination connection having a cylindrical electric field relaxation layer. The cylindrical electric field relaxation layer is formed by integrating a high dielectric constant portion and a conductive portion, and the high dielectric constant portion is in contact with the cable insulating layer, and the conductive portion is formed of the cable. The insulating layer and the cable external semiconductive layer are provided so as to be in contact with each other. By doing so, even if a gap is present at the cut end of the external semiconductive layer, it is possible to prevent electric field concentration on the gap by covering the gap with the conductive portion.
【０００７】[0007]
【発明の実施の形態】図１は、本発明の電力ケ−ブル用
終端接続部の要部縦断面図であり、図２は図１のＢ部を
拡大したものであってそれぞれ請求項１に係わるもので
ある。図1において、従来の電力ケ−ブル用終端接続部
である図６との相違点は、円筒状電界緩和層３の構成に
ある。図１から明らかなとおり本発明の円筒状電界緩和
層３は、高誘電率部３ａと導電部３ｂとから成り、これ
らを一体成形したものとしている。高誘電率部３ａはケ
−ブル絶縁層２に接し、導電部３ｂはケ−ブル絶縁層２
とケ−ブル外部半導電層４とに跨ってそれぞれ接するよ
うに設けたものである。FIG. 1 is a longitudinal sectional view of a main part of a power cable terminal connecting portion according to the present invention, and FIG. 2 is an enlarged view of a portion B in FIG. It is related to. In FIG. 1, the difference from FIG. 6 which is a conventional power cable termination connection is in the configuration of the cylindrical electric field relaxation layer 3. As is clear from FIG. 1, the cylindrical electric field relaxation layer 3 of the present invention is composed of a high dielectric constant portion 3a and a conductive portion 3b, which are integrally formed. The high dielectric portion 3a is in contact with the cable insulating layer 2, and the conductive portion 3b is the cable insulating layer 2.
And the cable external semiconductive layer 4 so as to be in contact with each other.
【０００８】前記のとおりの構成とすることにより、外
部半導電層４の厚みにより生ずる空隙部７は導電部３ｂ
により覆われる。このため、電界集中は空隙部７ではな
く、導電部３ｂの先端部（高誘電率部３ａと導電部３ｂ
との一体化接合部３ｃ）となる。この電界が集中する導
電部３ｂの先端部には空隙部がないので、この部分では
部分放電は発生しない。一方、外部半導電層４の厚みに
より生ずる空隙部７があってもこの空隙部７は導電部３
ｂで覆われており、電界が集中しないのでこの部分での
部分放電の発生が防止できることとなる。With the above-described structure, the gap 7 generated by the thickness of the external semiconductive layer 4 is reduced
Covered by Therefore, the electric field concentration is caused not by the gap 7 but by the tip of the conductive portion 3b (the high dielectric portion 3a and the conductive portion 3b).
3c). Since there is no void at the end of the conductive portion 3b where the electric field is concentrated, no partial discharge occurs in this portion. On the other hand, even if there is a gap 7 caused by the thickness of the external semiconductive layer 4, this gap 7
Since it is covered with b and the electric field is not concentrated, the occurrence of partial discharge in this portion can be prevented.
【０００９】高誘電率部３ａと導電部３ｂは、いずれ
も、一般的には同質の材料を主材料として製造されてい
る。たとえば、いずれも、エチレンプロピレンゴム又は
シリコ−ンゴムのようなゴム材料を主材料としてカ−ボ
ンを混合しており、カ−ボンの粒子径、混合条件の相違
程度なので、円筒状電界緩和層３としてこれらを成形す
る際、高誘電率部３ａと導電部３ｂとの境界面、即ち一
体化接合部３ｃは密着される。従って、空気層はできる
ことがない。[0009] The high dielectric constant portion 3a and the conductive portion 3b are generally manufactured using the same material as a main material. For example, in each case, carbon is mixed with a rubber material such as ethylene propylene rubber or silicone rubber as a main material, and the particle diameter of the carbon and the mixing conditions are different from each other. When these are formed, the boundary surface between the high dielectric constant portion 3a and the conductive portion 3b, that is, the integrated joint portion 3c is adhered. Therefore, no air layer can be formed.
【００１０】次に、円筒状電界緩和層３における高誘電
率部３ａと導電部３ｂの構成の仕方についての他の実施
形態を図３乃至図５により説明する。Next, another embodiment of the configuration of the high dielectric portion 3a and the conductive portion 3b in the cylindrical electric field relaxation layer 3 will be described with reference to FIGS.
【００１１】図２において、高誘電率部３ａと導電部３
ｂとの一体化接合部３ｃはほぼ水平となっているが、こ
の場合、接合部３ｃにおける導電部３ｂの電界は外側よ
りも内側の方が大きい。接合部３ｃにおける導電部３ｂ
の内側の電界をより小さくする必要が生じた場合は、図
３に示すように高誘電率部３ａと導電部３ｂとの一体化
接合部３ｃにおける導電部３ｂの縦断面形状をケ−ブル
端部の方向に内側から外側に向かって上り傾斜をなすよ
うにすれば良い。In FIG. 2, a high permittivity portion 3a and a conductive portion 3
Although the integrated joint 3c with b is substantially horizontal, in this case, the electric field of the conductive portion 3b at the joint 3c is larger on the inside than on the outside. Conductive part 3b at joint 3c
If it is necessary to reduce the electric field inside the conductive part 3b, as shown in FIG. 3, the longitudinal section of the conductive part 3b at the integrated joint 3c between the high permittivity part 3a and the conductive part 3b is changed to the cable end. What is necessary is just to make an upward slope from the inside to the outside in the direction of the part.
【００１２】又、一体化接合部３ｃにおける導電部３ｂ
の外側の電界をより小さくする必要が生じた場合は、円
筒状電界緩和層３はその軸方向で構成を二種類とし、そ
の片方は高誘電率部のみとし、他方は内層を導電部、外
層を高誘電率部としてそれぞれを一体化接合した２層構
造とすれば良い。The conductive portion 3b in the integrated joint 3c
When it is necessary to reduce the electric field outside the cylindrical electric field reducing layer 3, the cylindrical electric field relaxing layer 3 has two types in the axial direction, one of which has only a high dielectric constant portion, the other has an inner layer as a conductive portion and an outer layer as an outer layer. May be made into a two-layer structure in which each is integrally joined as a high dielectric constant portion.
【００１３】これを図４により説明する。図４の円筒状
電界緩和層３は高誘電率部３ａの片方側内面にへこみ段
差部３ｄがあり、このへこみ段差部３ｄを埋めるように
導電部３ｂを一体化接合したものである。次に段剥ぎし
たケ−ブルとの位置関係を説明すると、導電部３ｂの内
面は図３同様、ケ−ブル絶縁層２とケ−ブル外部半導電
層４とに跨ってそれぞれ接するように設けられている
が、導電部３ｂの厚さは、図２、図３の導電部３ｂの厚
さよりも薄くなっている。このような構成とすることに
より一体化接合部３ｅにおける導電部３ｂの端部の外側
の電界をより小さくすることができる。This will be described with reference to FIG. The cylindrical electric field relaxation layer 3 in FIG. 4 has a recessed step 3d on the inner surface on one side of the high dielectric constant section 3a, and the conductive section 3b is integrally joined so as to fill the recessed step 3d. Next, the positional relationship with the stripped cable will be described. The inner surface of the conductive portion 3b is provided so as to be in contact with the cable insulating layer 2 and the cable outer semiconductive layer 4 as in FIG. However, the thickness of the conductive portion 3b is smaller than the thickness of the conductive portion 3b in FIGS. With such a configuration, the electric field outside the end of the conductive portion 3b in the integrated joint portion 3e can be further reduced.
【００１４】又、一体化接合部３ｅにおける導電部３ｂ
の端部の内側及び外側のそれぞれの電界をより小さくす
るためには、図４における導電部３ｂの端部の縦断面形
状を図５に示すようにケ−ブル端部の方向に内側から外
側に向かって上り傾斜をなすようにすれば良い。これ
は、図３と図４の発明を複合し、双方の利点を生かした
ものである。The conductive portion 3b in the integrated joint 3e
In order to further reduce the electric field inside and outside the end of the cable, the vertical cross-sectional shape of the end of the conductive portion 3b in FIG. 4 must be changed from inside to outside in the direction of the cable end as shown in FIG. It is sufficient to make an upward slope toward. This is a combination of the inventions of FIGS. 3 and 4, taking advantage of both.
【００１５】[0015]
【発明の効果】以上説明したように、本発明の電力ケ−
ブル用終端接続部によれば円筒状電界緩和層３は、従来
のストレスレリ−フコ−ンタイプに比べ、薄肉化が可能
となりコンパクト化が図れるとともに、外部半導電層４
の切断端部の空隙部７には電界が集中しないため、この
部分での部分放電発生を防止できるので、より信頼性の
高い電力ケ−ブル用終端接続部が得られる。As described above, the power cable of the present invention is used.
According to the cable termination connection portion, the cylindrical electric field relaxation layer 3 can be made thinner and more compact than the conventional stress relief type, and the external semiconductive layer 4 can be formed.
Since the electric field is not concentrated in the gap 7 at the cut end, the occurrence of partial discharge in this portion can be prevented, so that a more reliable power cable terminal connection can be obtained.
【００１６】[0016]
【図１】本発明の電力ケ−ブル用終端接続部の要部縦断
面図である。FIG. 1 is a vertical sectional view of a main part of a power cable terminal connection section according to the present invention.
【図2】図１のＢ部拡大図である。FIG. 2 is an enlarged view of a portion B in FIG. 1.
【図3】本発明の電力ケ−ブル用終端接続部を示す図１
のＢ部の他の実施形態を示す拡大図である。FIG. 3 is a diagram showing a power cable termination connection according to the present invention.
It is an enlarged view which shows other embodiment of the B section of FIG.
【図４】本発明の電力ケ−ブル用終端接続部を示す図１
のＢ部の他の実施形態を示す拡大図である。FIG. 4 shows a power cable termination connection according to the present invention.
It is an enlarged view which shows other embodiment of the B section of FIG.
【図５】本発明の電力ケ−ブル用終端接続部を示す図１
のＢ部の他の実施形態を示す拡大図である。FIG. 5 shows a power cable termination connection of the present invention.
It is an enlarged view which shows other embodiment of the B section of FIG.
【図６】従来の電力ケ−ブル用終端接続部の要部縦断面
図である。FIG. 6 is a longitudinal sectional view of a main part of a conventional power cable terminal connection section.
【図７】図６のＡ部拡大図である。FIG. 7 is an enlarged view of a portion A in FIG. 6;
１ 導体 ２ ケ−ブル絶縁層 ３ 円筒状電界緩和層 ３ａ高誘電率部 ３ｂ導電部 ３ｃ一体化接合部 ３ｄへこみ段差部 ３ｅ一体化接合部 ４ 外部半導電層 ５ 遮蔽層 ６ 防食層 ７ 空隙部 DESCRIPTION OF SYMBOLS 1 Conductor 2 Cable insulating layer 3 Cylindrical electric field relaxation layer 3a High dielectric constant part 3b Conductive part 3c Integrated joint part 3d dent step part 3e Integrated joint part 4 External semiconductive layer 5 Shielding layer 6 Corrosion protection layer 7 Void
Claims (3)
用終端接続部において、ケ−ブル絶縁層とケ−ブル外部
半導電層を段剥ぎ露出させ、円筒状電界緩和層は高誘電
率部と導電部とを一体化してなり、前記高誘電率部は前
記ケ−ブル絶縁層に接し、前記導電部は前記ケ−ブル絶
縁層と前記ケ−ブル外部半導電層とに跨ってそれぞれ接
するように設けてなることを特徴とする電力ケ−ブル用
終端接続部。In a power cable termination connection having a cylindrical electric field relaxation layer, a cable insulation layer and a cable external semiconductive layer are peeled off and exposed, and the cylindrical electric field relaxation layer has a high dielectric constant. And a conductive portion, wherein the high dielectric portion contacts the cable insulating layer, and the conductive portion straddles the cable insulating layer and the cable external semiconductive layer. A power cable termination connector, which is provided so as to be in contact with the power cable.
電部との一体化接合部における導電部の縦断面形状がケ
−ブル端部の方向に内側から外側に向かって上り傾斜を
なしていること特徴とする請求項１記載の電力ケ−ブル
用終端接続部。2. The vertical cross-sectional shape of the conductive portion at the integrated junction of the high dielectric constant portion and the conductive portion of the cylindrical electric field relaxation layer is inclined upward from the inside toward the outside in the direction of the cable end. 2. The power cable termination connection according to claim 1, wherein the connection is terminated.
種類の構成とし、その片方は高誘電率部のみからなり、
他方は内層を導電部、外層を高誘電率部としてそれぞれ
を一体化接合した二層構造からなっていることを特徴と
する請求項１記載の電力ケ−ブル用終端接続部。3. The cylindrical electric field relaxation layer has two types of structures in its axial direction, one of which is composed only of a high dielectric constant portion,
2. The power cable termination connection according to claim 1, wherein the other end has a two-layer structure in which the inner layer is a conductive portion and the outer layer is a high dielectric portion, and the two layers are integrally joined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001080685A JP2002281652A (en) | 2001-03-21 | 2001-03-21 | Terminal connection part for power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001080685A JP2002281652A (en) | 2001-03-21 | 2001-03-21 | Terminal connection part for power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002281652A true JP2002281652A (en) | 2002-09-27 |
Family
ID=18936923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001080685A Pending JP2002281652A (en) | 2001-03-21 | 2001-03-21 | Terminal connection part for power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002281652A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6787703B2 (en) | 2001-11-27 | 2004-09-07 | Fujikura Ltd. | Connection structure and connection member for electrical connection of power cables |
| US6979707B2 (en) | 2003-03-17 | 2005-12-27 | Fujikura Ltd. | High-permittivity rubber compounds and power cable members |
| CN103971795A (en) * | 2014-05-16 | 2014-08-06 | 河南乐山电缆有限公司 | Medium-voltage crosslinked cable belt head structure and application method thereof |
-
2001
- 2001-03-21 JP JP2001080685A patent/JP2002281652A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6787703B2 (en) | 2001-11-27 | 2004-09-07 | Fujikura Ltd. | Connection structure and connection member for electrical connection of power cables |
| US6979707B2 (en) | 2003-03-17 | 2005-12-27 | Fujikura Ltd. | High-permittivity rubber compounds and power cable members |
| CN103971795A (en) * | 2014-05-16 | 2014-08-06 | 河南乐山电缆有限公司 | Medium-voltage crosslinked cable belt head structure and application method thereof |
| CN103971795B (en) * | 2014-05-16 | 2016-07-06 | 河南乐山电缆有限公司 | A kind of middle pressure crosslinked cable using method with header structure |
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