JPH0425642B2 - - Google Patents
Info
- Publication number
- JPH0425642B2 JPH0425642B2 JP2996583A JP2996583A JPH0425642B2 JP H0425642 B2 JPH0425642 B2 JP H0425642B2 JP 2996583 A JP2996583 A JP 2996583A JP 2996583 A JP2996583 A JP 2996583A JP H0425642 B2 JPH0425642 B2 JP H0425642B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- voltage cable
- crosslinking
- high voltage
- layer
- 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
Links
- 238000009413 insulation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000003431 cross linking reagent Substances 0.000 claims description 5
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 5
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 5
- -1 t-butyltetramethylbutylperoxide Chemical compound 0.000 claims description 5
- 238000004132 cross linking Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 8
- 230000007774 longterm Effects 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、長期安定性に優れた架橋ポリエチレ
ンケーブルに関するものである。
〔発明の背景及び概要〕
高電圧ケーブルとしては、OFケーブルの他に
架橋ポリエチレンケーブル等が用いられている。
このうち後者は、保守の容易さ、低送電ロス等か
ら前者に代わり広く使用されつつある。ところ
が、後者は長期安定性に於て前者に比べ劣る欠点
があり、この欠点を改善するため従来より種々の
検討がなされて来たが、依然として満足すべき解
決は得られていない。
発明者らは、上記の点に鑑みて、種々検討を加
えた結果、架橋剤としてｔ−ブチルテトラメチル
ブチルパーオキサイドを用いれば、長期特性が大
巾に改善できることを見い出した。
さらにこの効果は、架橋方式が乾式（赤外線ヒ
ータ、シリコーンバス等高圧水蒸気を用いない加
熱方法である場合、絶縁厚が５mm以上である場
合、および絶縁層の外方に、金属層を有する遮水
層を設けた場合に、いつそう顕著になることが、
調査の結果明らかになつた。
本発明は、上記の点に鑑みて為されたものであ
り、長期安定性に優れた、架橋ポリエチレン絶縁
ケーブルを提供するものである。
〔発明の具体的説明〕
本発明において、架橋剤としてｔ−ブチルテト
ラメチルブチルパーオキサイドを用いたのは、後
述する実施例より明らかなように、長期の安定性
が大巾に向上するためである。本現象が、いかな
る理由により生ずるかは、まだ不明であるが、本
現象に基づき高性能の高電圧ケーブルを提供しう
ることは明白である。
尚、本発明は絶縁層として用いる架橋ポリエチ
レンに、必要に応じ酸化防止剤等を配合しても良
い。
以下に本発明の効果を具体的な実施例を用いて
説明する。
低密度ポリエチレン（MI＝３、密度0.92）100
重量部に、４，4′−チオビス−（６−ｔ−ブチル
−３−メチルフエノール）0.2重量部及び架橋剤
として第１表に示す過酸化物を配合し、そのポリ
エチレン組成物を150mm3のより線の外方に押出し
被覆してる、５及び23mmの各厚さの絶縁層とし、
各種の加熱方法による化学架橋を行なつてケーブ
ルを得た。
得られたケーブルを、90℃の温度で、7KV／
mmの空中課電を行ない、破壊に至るまでの時間を
測定した。
本発明の実施例及び比較例の評価は、比較例
１、比較例２、比較例３及び比較例４の破壊時間
をそれぞれT1，T2，T3及びT4とし、これらと同
絶縁厚の実施例の破壊時間をそれぞれ比で求め
た。
ケーブルサイズ、絶縁厚、内外半導電層厚さ、
配合及び上記破壊時間（比較例１、２、３、４に
対する比）は第１表に示した通りである。
第１表の空中課電の結果から明らかな様にｔ−
ブチルテトラメチルブチルパーオキサイドを架橋
剤として用いたケーブルは、長期絶縁破壊特性が
従来から使用されているジクミルパーオキサイド
で架橋したケーブルよりも優れたものであつた。
さらに、この結果は、赤外線架橋及びシリコン
バスで架橋した場合や絶縁厚が７mm以上の場合
に、いつそう顕著であつた。
又、比較例３、実施例３のケーブルを用いて、
その上に金属層を設けてPVCシースを被覆した
ケーブルを作成し、先と同様の試験を行なつた結
果、実施例３を用いたケーブルの破壊時間は、比
較例３のを用いたケーブルの約10倍となつた。
【表】DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a crosslinked polyethylene cable with excellent long-term stability. [Background and Summary of the Invention] In addition to OF cables, cross-linked polyethylene cables and the like are used as high voltage cables.
Among these, the latter is becoming widely used instead of the former because of its ease of maintenance and low power transmission loss. However, the latter has the disadvantage that it is inferior to the former in terms of long-term stability, and although various studies have been made to improve this disadvantage, a satisfactory solution has not yet been obtained. In view of the above points, the inventors conducted various studies and found that long-term properties can be greatly improved by using t-butyltetramethylbutylperoxide as a crosslinking agent. Furthermore, this effect is effective when the crosslinking method is a dry method (heating method that does not use high-pressure steam, such as infrared heaters or silicone baths), when the insulation thickness is 5 mm or more, and when there is a water barrier with a metal layer on the outside of the insulation layer. When a layer is provided, when will it become so obvious?
This was revealed as a result of the investigation. The present invention has been made in view of the above points, and provides a crosslinked polyethylene insulated cable with excellent long-term stability. [Specific Description of the Invention] In the present invention, t-butyltetramethylbutyl peroxide was used as a crosslinking agent because, as is clear from the examples described later, long-term stability is greatly improved. be. Although it is still unclear why this phenomenon occurs, it is clear that a high-performance high-voltage cable can be provided based on this phenomenon. In addition, in the present invention, an antioxidant or the like may be added to the crosslinked polyethylene used as the insulating layer, if necessary. The effects of the present invention will be explained below using specific examples. Low density polyethylene (MI=3, density 0.92) 100
0.2 parts by weight of 4,4'-thiobis-(6-t-butyl-3-methylphenol) and the peroxide shown in Table 1 as a crosslinking agent were added to each part by weight, and the polyethylene composition was mixed into a 150 mm 3 An insulating layer with a thickness of 5 and 23 mm is extruded and coated on the outside of the stranded wire,
Cables were obtained by chemical crosslinking using various heating methods. The obtained cable was heated to 7KV/at a temperature of 90℃.
An air current of mm was applied and the time until destruction was measured. The evaluation of the Examples and Comparative Examples of the present invention was performed using the breakdown times of Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 as T 1 , T 2 , T 3 , and T 4 , respectively, and the same insulation thickness as these. The failure times of the Examples were determined as a ratio. Cable size, insulation thickness, inner and outer semiconducting layer thickness,
The formulation and the above-mentioned failure time (ratio to Comparative Examples 1, 2, 3, and 4) are as shown in Table 1. As is clear from the results of air charging in Table 1, t-
The cable using butyltetramethylbutyl peroxide as a crosslinking agent had better long-term dielectric breakdown properties than the cable crosslinked with dicumyl peroxide, which has been used in the past. Moreover, this result was more noticeable when crosslinking was performed using infrared crosslinking and a silicone bath, and when the insulation thickness was 7 mm or more. Also, using the cables of Comparative Example 3 and Example 3,
A cable was made with a metal layer on top of the PVC sheath and the same test was conducted as before. As a result, the failure time of the cable using Example 3 was lower than that of the cable using Comparative Example 3. It became about 10 times. 【table】
Claims (1)
を架橋剤として用いた架橋ポリエチレンを絶縁層
とする高電圧ケーブル。 ２ 架橋方式が乾式である、特許請求の範囲第１
項記載の高電圧ケーブル。 ３ 絶縁厚が５mm以上である、特許請求の範囲第
１あるいは第２項記載の高電圧ケーブル。 ４ 絶縁層の外方に金属層を有する遮水層を設け
た、特許請求の範囲第１，第２あるいは第３項記
載の高電圧ケーブル。[Scope of Claims] 1. A high voltage cable whose insulating layer is made of crosslinked polyethylene using t-butyltetramethylbutylperoxide as a crosslinking agent. 2 Claim 1 in which the crosslinking method is a dry method
High voltage cable as described in section. 3. The high voltage cable according to claim 1 or 2, having an insulation thickness of 5 mm or more. 4. The high-voltage cable according to claim 1, 2, or 3, which is provided with a water-blocking layer having a metal layer on the outside of the insulating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2996583A JPS59154711A (en) | 1983-02-23 | 1983-02-23 | high voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2996583A JPS59154711A (en) | 1983-02-23 | 1983-02-23 | high voltage cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59154711A JPS59154711A (en) | 1984-09-03 |
| JPH0425642B2 true JPH0425642B2 (en) | 1992-05-01 |
Family
ID=12290680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2996583A Granted JPS59154711A (en) | 1983-02-23 | 1983-02-23 | high voltage cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59154711A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60172104A (en) * | 1984-02-15 | 1985-09-05 | 日立電線株式会社 | electrical insulation composition |
| JPH0828136B2 (en) * | 1988-03-02 | 1996-03-21 | 株式会社フジクラ | Electrical insulation composition and power cable |
-
1983
- 1983-02-23 JP JP2996583A patent/JPS59154711A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59154711A (en) | 1984-09-03 |
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