JPS60172106A

JPS60172106A - Electrically insulated cable

Info

Publication number: JPS60172106A
Application number: JP2941684A
Authority: JP
Inventors: 松原　宏長; 昭介山之内; 喜之井上
Original assignee: Sumitomo Electric Industries Ltd
Current assignee: Sumitomo Electric Industries Ltd
Priority date: 1984-02-17
Filing date: 1984-02-17
Publication date: 1985-09-05

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】〔発明の技術分野〕本発明は、絶縁劣化に対しすぐれた耐性全盲する電気絶
縁ケーブルに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a completely blind electrically insulated cable with excellent resistance to insulation deterioration.

[Background of the invention]

ポリエチレン又は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
して来ている。ところでこのような電線ケーブルに於て
もっとも大きな問題は、これらの電線、ケーブルが課電
を続けると徐々に劣化をきたすことである。劣化の機構
について数多くの研究が行われているが、現在まで明確
にされていない。このため発明者らは鋭意研究した結果
、上記劣化を抑えることのできる電気絶縁ケーブルを発
明することが出来た。BACKGROUND OF THE INVENTION Electric wire cables having insulators mainly composed of olefin polymers such as polyethylene or crosslinked polyethylene are currently widely used, and their voltage classes have been increasing significantly over the years. By the way, the biggest problem with such electric wires and cables is that these electric wires and cables gradually deteriorate if electricity is continued to be applied to them. Although many studies have been conducted on the mechanism of deterioration, it has not been clarified to date. Therefore, as a result of intensive research, the inventors were able to invent an electrically insulated cable that can suppress the above-mentioned deterioration.

[Summary of the invention]

本発明はこのような電気劣化を抑える電気、絶縁ケーブ
ルに提供するものである。即ちエチレンとα−オレフィ
ンの共重合体とエチレン酢酸ビニル共重合体からなる組
成物全架橋することにより電気劣化を抑えケーブルの長
寿命化に成功した。The present invention provides an electrically insulated cable that suppresses such electrical deterioration. That is, by completely crosslinking a composition consisting of a copolymer of ethylene and α-olefin and an ethylene-vinyl acetate copolymer, it was possible to suppress electrical deterioration and extend the life of the cable.

[Detailed description of the invention]

本発明に於て、エチレンとα−オレフィンの共重合体は
、α−オレフィンの炭素数が８以下がのぞましい。炭素
数が８を越えるとその理由は明らかでないが電気劣化を
抑える効果が小さい。また密度が０．９１より小さいと
初期の破壊電界が低下してくる。又重量平均分子量と数
平均分子量が３より小さいと長尺ケーブルの場合、低電
圧初期破壊をお・こす割合が増加する。又エチレン４酢
酸ビニル共重合体の酢酸ビニル量が１係より小さいと電
気劣化を抑える効果が小さく、１０係と越すとｔａｎδ
　が大きくなる欠点に有する。In the present invention, the copolymer of ethylene and α-olefin preferably has 8 or less carbon atoms in the α-olefin. When the number of carbon atoms exceeds 8, the effect of suppressing electrical deterioration is small, although the reason is not clear. Moreover, if the density is smaller than 0.91, the initial breakdown electric field will decrease. Furthermore, if the weight average molecular weight and number average molecular weight are smaller than 3, the rate of low voltage initial breakdown increases in the case of long cables. Furthermore, if the amount of vinyl acetate in the ethylene 4-vinyl acetate copolymer is less than 1 part, the effect of suppressing electrical deterioration will be small, and if it exceeds 10 parts, the tan δ
It has the disadvantage of becoming larger.

以下実施例を示す。Examples are shown below.

ｉ　ｍｍ単線導体に０．８　ｍｍ厚の内部半導電層を押
出した後第１表に示す絶縁物を押出し、５　ｋｇ／ａｎ
２の窒素下で２００°Ｃで２分加熱し架橋した。After extruding a 0.8 mm thick internal semiconducting layer onto an i mm single wire conductor, extruding the insulator shown in Table 1, 5 kg/an
Crosslinking was carried out by heating at 200°C for 2 minutes under nitrogen.

出来上ったケーブルを６０°Ｃ水中に浸漬し、１３、３
１ｃＶ／ｍ…の交流電界を印加し破壊時間とめた。The completed cable was immersed in 60°C water, and
An alternating current electric field of 1 cV/m... was applied to stop the breakdown time.

結果全第１表に示す。尚、第１表においてエチレン酢酸
ビニル共重合体をＥＶＡと、酢酸ビニル量をＶＡ量と略
記する。All results are shown in Table 1. In Table 1, the ethylene vinyl acetate copolymer is abbreviated as EVA, and the amount of vinyl acetate is abbreviated as VA amount.

手　続　補　正　書昭和５９年６月１７日特許庁長官　若　杉　和　夫　殿１、事件の表示昭和５９年特許願第２９４１６号２　発明の名称電気絶縁ケーブル３、補正をする者事件との関係　特許出願人任　所　大阪市東区北浜５丁目１５番地名　称（２１３
）住友電気］二業株式会社社　長　川　上　哲　部４、代理人住　所　大阪市此花区島屋Ｖ丁目１番３号−。Procedures Amendment Written June 17, 1980 Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case, Patent Application No. 29416 of 1983. 2. Name of the invention, electrically insulated cable 3. Person making the amendment. Relationship with the case. Patent Applicant Address: 5-15 Kitahama, Higashi-ku, Osaka Name (213)
) Sumitomo Electric] Nigyo Co., Ltd. President Tetsu Kawakami Department 4, agent address 1-3 Shimaya V-chome, Konohana-ku, Osaka.

住友電気工業株式会社内（電話大阪　４６１−１０３１）氏　名（７８８１）弁理士　」二　代　哲　司６、補正
の対象明細書及び委任状７、補正の内容（１）タイプ印書により鮮細に記載した明細書を別紙の
とおり提出しまず。Within Sumitomo Electric Industries, Ltd. (Telephone Osaka 461-1031) Name (7881) Patent Attorney Tetsuji II 6, Specification to be amended and power of attorney 7, Contents of amendment (1) Clear and clear by type printing First, submit the detailed statement as attached.

■委任者印を鮮明に押印した委任状を別紙のとおり提出
しまず。■First, submit a power of attorney with the power of attorney's stamp clearly stamped as shown in the attached sheet.

Claims

[Scope of Claims] An electrically insulated cable (2) characterized in that the α-olefin has carbon atoms of 8 or less, a density of 0.91 or more, and a weight average molecule of The electrically insulated cable (3) according to claim 1, wherein the average molecular weight ratio is 3 or more, and the amount of vinyl acetate in the composition is from 1 part to 10 parts. )
Electrically insulated cables listed in section