JP3087284B2 - Electrical insulation cable - Google Patents
Electrical insulation cableInfo
- Publication number
- JP3087284B2 JP3087284B2 JP02114141A JP11414190A JP3087284B2 JP 3087284 B2 JP3087284 B2 JP 3087284B2 JP 02114141 A JP02114141 A JP 02114141A JP 11414190 A JP11414190 A JP 11414190A JP 3087284 B2 JP3087284 B2 JP 3087284B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- electric field
- cable
- field relaxation
- mixture
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は地中送配電用ケーブルとして用いられるゴ
ム、プラスチック絶縁ケーブルの如き固体絶縁ケーブル
の改良に関するものである。Description: TECHNICAL FIELD The present invention relates to improvements in solid insulated cables such as rubber and plastic insulated cables used as underground power transmission and distribution cables.
（従来の技術及び解決しようとする課題） 固体絶縁ケーブルにおいて、特にケーブルの端末部、
接続部の改良のため、ケーブル絶縁層と外部半導電層の
間に高抵抗の電界緩和層を設けることが知られている
（例えば特開昭60−219912号公報参照）。(Prior art and problems to be solved) In a solid insulated cable, particularly, a terminal portion of the cable,
It is known to provide a high-resistance electric field relaxation layer between a cable insulating layer and an external semiconductive layer for improving a connection portion (for example, see Japanese Patent Application Laid-Open No. 60-219912).
しかしながら、このような場合、電界緩和層及び外部
半導電層には導電性粒子であるカーボンブラック等を充
填する必要性から、いずれの層も、例えばエチレン−エ
チルアクリレート（EEA）、エチレン−酢酸ビニル（EV
A）等の有極性高分子により形成するのが通例である。However, in such a case, since the electric field relaxation layer and the outer semiconductive layer need to be filled with conductive particles such as carbon black, both layers are made of, for example, ethylene-ethyl acrylate (EEA) or ethylene-vinyl acetate. (EV
Usually, it is formed of a polar polymer such as A).
そのため、２つの層の間は剥離が不可能であり、ケー
ブルの接続部あるいは端末部形成の際には、外部半導電
層のみを削り取り、電界緩和層のみを残すという繁雑で
高度の技術を要する作業が必要となるのみならず、電界
緩和層に傷をつけてしまい、その性能を損なうこともあ
った。Therefore, separation between the two layers is impossible, and when forming a connection portion or a terminal portion of a cable, only the outer semiconductive layer is scraped off, and a complicated and advanced technique of leaving only the electric field relaxation layer is required. In addition to the need for work, the electric field relaxation layer may be damaged and its performance may be impaired.
（課題を解決するための手段） 本発明は上述の問題点を解消し、電界緩和層と外部半
導電層との剥離を容易にした電気絶縁ケーブルを提供す
るもので、その特徴は、電界緩和層が無極性高分子にカ
ーボンブラックを混合したものを主体とする組成物、外
部半導電層が有極性高分子にカーボンブラックを混合し
たものを主体とする組成物で形成されていることにあ
る。(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides an electrically insulated cable that facilitates separation between an electric field relaxation layer and an external semiconductive layer. The layer is formed of a composition mainly composed of a mixture of a nonpolar polymer and carbon black, and the outer semiconductive layer is composed of a composition mainly composed of a mixture of a polar polymer and carbon black. .
第１図は固体絶縁層の上に電界緩和層、外部半導電層
を順次設けた電気絶縁ケーブルの要部の横断面図であ
る。図面において、（１）は導体、（２）は内部半導電
層、（３）はゴム、プラスチック等の固体絶縁層、
（４）は高抵抗の電界緩和層、（５）は外部半導電層で
ある。FIG. 1 is a cross-sectional view of a main part of an electric insulation cable in which an electric field relaxation layer and an external semiconductive layer are sequentially provided on a solid insulation layer. In the drawings, (1) is a conductor, (2) is an inner semiconductive layer, (3) is a solid insulating layer of rubber, plastic, or the like,
(4) is a high-resistance electric field relaxation layer, and (5) is an external semiconductive layer.
本発明においては、上記電界緩和層（４）は無極性の
高分子にカーボンブラックを混合したものを主体とする
組成物で形成する。上記無極性高分子としては、エチレ
ンとカーボン数４以上のα−オレフインの共重合体で、
密度が0.922g/cm2以下のもの、あるいはエチレン−プロ
ピレンゴム、又はこれらの混合物が機械的強度の面から
好ましい。カーボンブラックとしてはアセチレンブラッ
ク、ファーネスブラック等が用いられる。In the present invention, the electric field relaxation layer (4) is formed of a composition mainly composed of a mixture of non-polar polymer and carbon black. As the non-polar polymer, a copolymer of ethylene and α-olefin having 4 or more carbon atoms,
Those having a density of 0.922 g / cm 2 or less, ethylene-propylene rubber, or a mixture thereof are preferred in terms of mechanical strength. As carbon black, acetylene black, furnace black and the like are used.
外部半導電層（５）は有極性高分子にカーボンブラッ
クを混合したものを主体とする組成で形成する。上記有
極性高分子としては、例えば酢酸ビニル量33％以上のエ
チレン−酢酸ビニル樹脂を用いる。又カーボンブラック
としてはアセチレンブラック、ファーネスブラック等が
使用できる。The outer semiconductive layer (5) is formed with a composition mainly composed of a mixture of a polar polymer and carbon black. As the polar polymer, for example, an ethylene-vinyl acetate resin having a vinyl acetate content of 33% or more is used. As carbon black, acetylene black, furnace black and the like can be used.
なお、上述した組成物に必要に応じ、滑剤、酸化防止
剤等を配合してもよく、又有機過酸化物を配合して架橋
を施すことも機械的強度の面から好ましい。If necessary, a lubricant, an antioxidant, etc. may be added to the above-mentioned composition, and it is also preferable to mix an organic peroxide to perform crosslinking, from the viewpoint of mechanical strength.
（実施例） 電界緩和層に密度0.922g/cm3のエチレン−ブテン−１
共重合体にアセチレンブラック30重量部を配合した組成
物を用い、外部半導電層に酢酸ビニル量33％のエチレン
−酢酸ビニル共重合体にファストエクストル−ジョンフ
ァーネス80重量部を配合した組成物を用いて、150mm2の
円形圧縮導体上に1.0mm厚の内部半導電層、3.5mm厚の架
橋ポリエチレン絶縁層、0.5mm厚の電界緩和層、1.0mm厚
の外部半導電層を順次押出し成形した後、赤外線ヒータ
で架橋して6kV級のモデルケーブルを作製した。(Example) Ethylene-butene-1 having a density of 0.922 g / cm 3 was used for the electric field relaxation layer.
A composition in which a copolymer containing 30 parts by weight of acetylene black is blended, and an outer semiconductive layer is blended with an ethylene-vinyl acetate copolymer having a vinyl acetate content of 33% and 80 parts by weight of Fast Extrusion Furnace. using sequentially extruded inner semiconducting layer of 1.0mm thickness on a circular compression conductors of 150 mm 2, 3.5 mm thick crosslinked polyethylene insulation layer, the electric field relaxation layer 0.5mm thick, a 1.0mm thick external semiconductive layer After that, cross-linking was performed using an infrared heater to produce a 6 kV class model cable.
この後、ケーブルの端末部を作成したが、電界緩和層
と外部半導電層の間は容易に剥離（剥離力5kg/1.27cm）
出来、作業が簡便であった。又電界緩和層には全く傷が
つくことがなかった。After that, the terminal part of the cable was created, but it easily peeled between the electric field relaxation layer and the external semiconductive layer (peeling force 5 kg / 1.27 cm)
It was done and the work was simple. The electric field relaxation layer was not damaged at all.
なお、電界緩和層と外部半導電層間の剥離強度は実験
の結果によれば、0.5〜11kg/1.27cmの範囲にあることが
好ましい。According to the results of the experiment, the peel strength between the electric field relaxation layer and the external semiconductive layer is preferably in the range of 0.5 to 11 kg / 1.27 cm.
（発明の効果） 以上説明したように、本発明の電気絶縁ケーブルによ
れば、電界緩和層と外部半導電層間を容易に剥離するこ
とが可能となる。このことにより、ケーブルの端末部、
接続部形成の際の作業時間が著しく短縮されるのみなら
ず、電界緩和層に傷をつけることがないので、信頼性の
高い端末部、接続部を形成することが出来る。(Effect of the Invention) As described above, according to the electrically insulated cable of the present invention, the electric field relaxation layer and the external semiconductive layer can be easily separated. This allows the cable end,
Not only is the operation time for forming the connection portion significantly shortened, but also the electric field relaxation layer is not damaged, so that a highly reliable terminal portion and connection portion can be formed.
第１図は固体絶縁層の上に電界緩和層、外部半導電層を
設けたケーブルの要部の横断面図である。 １……導体、２……内部半導電層、３……絶縁層、４…
…電界緩和層、５……外部半導電層。FIG. 1 is a cross-sectional view of a main part of a cable in which an electric field relaxation layer and an external semiconductive layer are provided on a solid insulating layer. 1 ... conductor, 2 ... inner semiconductive layer, 3 ... insulating layer, 4 ...
... electric field relaxation layer, 5 ... external semiconductive layer.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01B 9/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) H01B 9/02
Claims (2)
層を順次設けた電気絶縁ケーブルにおいて、上記電界緩
和層が無極性高分子にカーボンブラックを混合したもの
を主体とする組成物、外部半導電層が有極性高分子にカ
ーボンブラックを混合したものを主体とする組成で形成
されていることを特徴とする電気絶縁ケーブル。An electric insulating cable comprising an electric field relaxing layer and an external semiconductive layer provided in this order on a solid insulating layer, wherein the electric field relaxing layer is mainly composed of a mixture of nonpolar polymer and carbon black. An electrically insulated cable, wherein the outer semiconductive layer is formed of a composition mainly composed of a mixture of a polar polymer and carbon black.
上のα−オレフイン共重合体で、エチレンプロピレンゴ
ムのいずれか、あるいはこれらの混合物であることを特
徴とする請求項（１）記載の電気絶縁ケーブル。2. The method according to claim 1, wherein the nonpolar polymer is ethylene and an α-olefin copolymer having 4 or more carbon atoms, and is either ethylene propylene rubber or a mixture thereof. Electrically insulated cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02114141A JP3087284B2 (en) | 1990-04-27 | 1990-04-27 | Electrical insulation cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02114141A JP3087284B2 (en) | 1990-04-27 | 1990-04-27 | Electrical insulation cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0412410A JPH0412410A (en) | 1992-01-17 |
| JP3087284B2 true JP3087284B2 (en) | 2000-09-11 |
Family
ID=14630171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02114141A Expired - Fee Related JP3087284B2 (en) | 1990-04-27 | 1990-04-27 | Electrical insulation cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3087284B2 (en) |
-
1990
- 1990-04-27 JP JP02114141A patent/JP3087284B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0412410A (en) | 1992-01-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |