JPS598209A - Electrically insulated cable - Google Patents
Electrically insulated cableInfo
- Publication number
- JPS598209A JPS598209A JP57117423A JP11742382A JPS598209A JP S598209 A JPS598209 A JP S598209A JP 57117423 A JP57117423 A JP 57117423A JP 11742382 A JP11742382 A JP 11742382A JP S598209 A JPS598209 A JP S598209A
- Authority
- JP
- Japan
- Prior art keywords
- electrically insulated
- insulated cable
- cables
- butene
- copolymer
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 本発明は、電気絶縁ケーブルに関する。[Detailed description of the invention] The present invention relates to electrically insulated cables.
ポリエチレン及び架橋ポリエチレン等のオレフィン重合
体を主組成物とした絶縁体をもつ電線ケーブルは現在広
く使用されており、その電圧階級は年と共に大きく上昇
してきている。ところでこのような電線、ケーブルにお
いて現在もつとも大きな技術的問題は、これらの電線、
ケーブルが裸電を続けていると徐々に劣化をきたし、破
壊電圧が低下してくることである。一般に電線、ケーブ
ル類の保証寿命は３０年と非常に長いため、現在の設計
基準としては、この低下分を考慮して絶縁体の厚みを厚
くしておく必要がある。ところで最近の都市化の現象は
、電線、ケーブルの管路は出来るだけ大きくせずに送電
容量は増加させたいという要求を生みつつある。このた
め、このようなオレフィン重合体を主絶縁体として用い
る電線、ケーブルにおいては、絶縁厚を増加させずに送
電圧を上昇させｋいという要求が生まれてくる。BACKGROUND ART Electric wire cables having insulators mainly composed of olefin polymers such as polyethylene and crosslinked polyethylene are currently widely used, and their voltage classes have been increasing significantly over the years. By the way, the biggest technical problem currently faced with these wires and cables is that
If the cable continues to be exposed to bare electricity, it will gradually deteriorate and the breakdown voltage will drop. Generally, the guaranteed lifespan of electric wires and cables is extremely long, 30 years, so current design standards require that the thickness of the insulator be increased to account for this reduction. Incidentally, the recent phenomenon of urbanization is creating a demand for increasing power transmission capacity without increasing the size of conduits for electric wires and cables. For this reason, in electric wires and cables using such olefin polymers as the main insulator, there is a need to increase the transmission voltage without increasing the insulation thickness.
これには種々の解決の方法があるが、そのひとつは先の
劣化現象が起らないようにすれば先の８０年間の低下分
を考慮する必要がなく、先の要求を満足させ得ることが
出来る。There are various ways to solve this problem, but one is that if the previous deterioration phenomenon does not occur, there is no need to consider the decline over the past 80 years, and the above requirements can be met. I can do it.
我々は、この点に注目し、これら電線、ケーブルの経年
劣化現象について鋭意研究した結果この劣化現象が、絶
縁体のミクロボイド又は導電層−絶縁層界面より生じる
ツリー発生によるものであることを見出した。We focused on this point and conducted intensive research on the aging phenomenon of these electric wires and cables, and found that this deterioration phenomenon is due to microvoids in the insulator or the generation of trees from the conductive layer-insulating layer interface. .
即ち、このような絶縁体のミクロな欠陥より生じるツリ
ーを抑えることにより先の劣化現象が起らなくなり、よ
って初期の絶縁厚を一挙に薄く出来るこ、とに成功した
。That is, by suppressing the tree caused by such microscopic defects in the insulator, the previous deterioration phenomenon can be prevented, and the initial insulation thickness can be reduced at once.
本発明は、このようなツリー発生を抑える電気絶縁ケー
ブルを提供するものである。、すなわち、エチレン−ブ
テンｌ共重合体を押出被覆し、必要とあらば架橋剤を配
合した電気絶縁用樹脂組成物を被覆することによって、
ツリーを抑え、従来の電線、ケーブルより数〜数十倍の
長寿命を得、初期の絶縁厚を一挙に薄く出来ることに成
功した。The present invention provides an electrically insulated cable that suppresses the occurrence of such trees. That is, by extrusion coating an ethylene-butene l copolymer and, if necessary, coating it with an electrically insulating resin composition containing a crosslinking agent,
We succeeded in suppressing the tree growth, achieving a lifespan several to several dozen times longer than conventional electric wires and cables, and reducing the initial insulation thickness all at once.
ここで４−ブテン１の共重合比（重量比）は０．５〜３
０％ がのぞましい。０．５％以下では効果が少くなり
、３０％以上では押出加工特性が悪くなる。Here, the copolymerization ratio (weight ratio) of 4-butene 1 is 0.5 to 3
0% is desirable. If it is less than 0.5%, the effect will be reduced, and if it is more than 30%, the extrusion properties will deteriorate.
もちろん本発明の電気絶縁ケーブルにおいて、必要とあ
らば、老化防止剤等を配合してもよい。Of course, in the electrically insulated cable of the present invention, an anti-aging agent or the like may be added, if necessary.
以下に実施例及び比較例を示す。Examples and comparative examples are shown below.
６０ｍＭ２の撚導体にまず内部導電層を押出被覆した後
、第１表に示す重合比の共重合物を３．５Ｂ押出しさら
にその上に外環電層を押出被覆して電線を得た。又、第
１表に示す如く、電子線架橋の必要なものは、押出被覆
後、常法により、電子線照射して架橋した。First, an inner conductive layer was coated on a 60mM2 twisted conductor by extrusion, and then a 3.5B copolymer having a polymerization ratio shown in Table 1 was extruded, and then an outer ring conductive layer was coated thereon by extrusion to obtain an electric wire. Further, as shown in Table 1, those that required electron beam crosslinking were crosslinked by electron beam irradiation in a conventional manner after extrusion coating.
又、化学架橋の必要なものは、架橋剤を配合し、押出被
覆した後、加熱して架橋を行った。For those requiring chemical crosslinking, a crosslinking agent was blended, extrusion coating was performed, and then crosslinking was performed by heating.
このようにして得られた電線を７０°Ｃ水中に浸漬し、
２０ＫＶの交流電圧を印加し、一定時間後取り出し、ツ
リーの発生状態を調べた。又破壊までの時間をポリエチ
レンを１として比較した結果を第１表に示す。The electric wire thus obtained was immersed in 70°C water,
An alternating current voltage of 20 KV was applied, and after a certain period of time, the tree was taken out and the state of tree growth was examined. Furthermore, Table 1 shows the results of a comparison with the time to failure set as 1 for polyethylene.
−１，傘２９重量比
・３．電子線照射量 ４０Ｍｒａｄ照射化学架橋 ディ
クミルパーオキサイド２重量部添加 ２００°Ｃ１０分
間加熱
弓、×・・・・・ 水トリーの発生がかなりはげしｂ）
。-1, Umbrella 29 weight ratio・3. Electron beam irradiation dose: 40 Mrad Irradiation chemical crosslinking Addition of 2 parts by weight of dicumyl peroxide Heating at 200°C for 10 minutes, x... The occurrence of water tree is quite severe b)
.
○・・・・・ 水トリーがほとんどみられない。○・・・・・・Almost no water trees are seen.
Claims (1)
レン−ブテン１共重合体を主組成物とした絶縁層を有す
ることを特徴とする電気絶縁ケーブル。(1) An electrically insulated cable characterized by having an insulating layer mainly composed of an ethylene-butene 1 copolymer or a crosslinked ethylene-butene 1 copolymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57117423A JPS598209A (en) | 1982-07-05 | 1982-07-05 | Electrically insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57117423A JPS598209A (en) | 1982-07-05 | 1982-07-05 | Electrically insulated cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS598209A true JPS598209A (en) | 1984-01-17 |
Family
ID=14711272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57117423A Pending JPS598209A (en) | 1982-07-05 | 1982-07-05 | Electrically insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS598209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530258Y2 (en) * | 1987-10-19 | 1993-08-03 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5678005A (en) * | 1979-11-29 | 1981-06-26 | Hitachi Cable | Electric insulator composition and insulated wire |
| JPS56147838A (en) * | 1980-04-18 | 1981-11-17 | Nippon Oil Co Ltd | Composition for forming insulation layer |
-
1982
- 1982-07-05 JP JP57117423A patent/JPS598209A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5678005A (en) * | 1979-11-29 | 1981-06-26 | Hitachi Cable | Electric insulator composition and insulated wire |
| JPS56147838A (en) * | 1980-04-18 | 1981-11-17 | Nippon Oil Co Ltd | Composition for forming insulation layer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530258Y2 (en) * | 1987-10-19 | 1993-08-03 |
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