JPH04121908A - Power cable - Google Patents
Power cableInfo
- Publication number
- JPH04121908A JPH04121908A JP2241802A JP24180290A JPH04121908A JP H04121908 A JPH04121908 A JP H04121908A JP 2241802 A JP2241802 A JP 2241802A JP 24180290 A JP24180290 A JP 24180290A JP H04121908 A JPH04121908 A JP H04121908A
- Authority
- JP
- Japan
- Prior art keywords
- low density
- weight
- density polyethylene
- sheet
- water
- 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
- 239000012212 insulator Substances 0.000 claims abstract description 8
- 238000004132 cross linking Methods 0.000 claims abstract description 5
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 240000005572 Syzygium cordatum Species 0.000 abstract description 12
- 235000006650 Syzygium cordatum Nutrition 0.000 abstract description 12
- 229920001684 low density polyethylene Polymers 0.000 abstract description 4
- 239000004702 low-density polyethylene Substances 0.000 abstract description 4
- 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 abstract description 3
- 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 abstract description 3
- 229920005601 base polymer Polymers 0.000 abstract description 3
- 239000003431 cross linking reagent Substances 0.000 abstract description 3
- 238000004898 kneading Methods 0.000 abstract description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000003973 paint Substances 0.000 abstract description 2
- 229910052709 silver Inorganic materials 0.000 abstract description 2
- 239000004332 silver Substances 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- XOUQAVYLRNOXDO-UHFFFAOYSA-N 2-tert-butyl-5-methylphenol Chemical compound CC1=CC=C(C(C)(C)C)C(O)=C1 XOUQAVYLRNOXDO-UHFFFAOYSA-N 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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
Landscapes
- Insulated Conductors (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、耐水トリー性に優れる電カケープルの改良に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an electric cable having excellent water resistance.
（従来の技術）
従来より、電力ケーブルの絶縁体としては、絶縁性能お
よび熱的特性に優れる架橋ポリエチレンを使用すること
が主流になっているが、このような電カケープルは水ト
リーの発生による絶縁性能の低下が問題となっており、
特に湿潤または浸水条件下での使用においては水トリー
の発生は著しい
これに対して従来から、架橋ポリエチレンに親水性の崩
脂（例えばエチレン−酢酸ビニル共重合体、エチレン−
ブテン共重合体等）を添加して水分子の局所的な集中を
防止したり、またケーブル外周に鉛ラミネートテープ等
の遣水層を設けて外部からの水の侵入を防ぐといった方
法で、水トリーの発生を抑制することが行われている。(Prior technology) Traditionally, cross-linked polyethylene, which has excellent insulation performance and thermal properties, has been used as the insulator for power cables, but such power cables suffer from insulation problems due to the occurrence of water trees. Decrease in performance is a problem,
Particularly when used under humid or submerged conditions, the occurrence of water tree is significant.In contrast, conventionally, crosslinked polyethylene has been made with hydrophilic fats (e.g. ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer,
Butene copolymers, etc.) can be added to prevent local concentration of water molecules, or a water layer such as lead laminate tape can be installed around the cable to prevent water from entering from outside. Efforts are being made to suppress the occurrence of
しかしながら、親水性の添加剤を添加すると水トリーの
発生はある程度抑制されるものの、添加剤の添加に起因
して絶縁体の電気特性、特にｔａｎδ特性と絶縁抵抗が
大きく低下してしまうという新たな問題を生してしまい
、結果的には絶縁性能の向上は計れないという欠点があ
った。また遣水層を設ける方法では、製造工程の増加に
伴う作業時間の長期化およびコスト高を生じ、また得ら
れるケーブルの仕上がり外径か大きくなってしまうとい
う欠点があった。However, although the addition of hydrophilic additives suppresses the occurrence of water trees to some extent, the addition of hydrophilic additives significantly reduces the electrical properties of the insulator, especially the tanδ properties and insulation resistance. This resulted in problems, and as a result, there was a drawback in that the insulation performance could not be improved. Furthermore, the method of providing a water layer has disadvantages in that it increases the number of manufacturing steps, prolongs the working time and increases costs, and the finished outer diameter of the resulting cable becomes large.
このような点に鑑みて、最近、架橋ポリエチレン自体を
改良して水トリーの向上を計る提案かなされ、例えば特
開平２−６８８１０号公報には密度０．８８〜０ 、９
１ ｇ 、、’ｃｘｎ３の超低密度ポリエチレンを架橋
してこれを絶縁体に用いた電カケープルが示されている
。In view of these points, proposals have recently been made to improve the water tree by improving cross-linked polyethylene itself.
An electric cable is shown in which cross-linked ultra-low density polyethylene of 1g, .cxn3 is used as an insulator.
しかしながら、このような範囲にある超低密度ポリエチ
レンを使用しても、耐水トリー性、ｔａｎδ特性および
！／ｌ！、縁抵抗の諸費性を同時に充分）Ｒなすことは
出来なかった。However, even if ultra-low density polyethylene in this range is used, water resistance, tan δ properties and! /l! At the same time, it was not possible to sufficiently reduce the cost of edge resistance.
（発明が解決しようとする課Ｈ）
以上の点に鑑みて、本発明は耐水トリー性、［ａｎ８特
性および絶縁抵抗を同時に充分に満足する電カケープル
を提供することを目的とする。(Problem H to be Solved by the Invention) In view of the above points, an object of the present invention is to provide a power cable that satisfactorily satisfies water resistance, AN8 characteristics, and insulation resistance at the same time.
（Ｎ題を解決するための手段）
本発明は即ち、密度０ 、９０ ｇ、、−ａｎ３以下、
重量平均分子量１５万以上で、かつヤング率３眩２・′
ｍ２以下の超低密度ポリエチレンを主成分とする絶縁体
を架橋させてなることを特徴とする電力ゲーブルに関す
る。(Means for Solving Problem N) The present invention has a density of 0, 90 g, -an3 or less,
Weight average molecular weight of 150,000 or more, and Young's modulus of 3 dazzling 2.'
The present invention relates to a power cable characterized by being formed by crosslinking an insulator whose main component is ultra-low density polyethylene of m2 or less.
本発明における上記超低密度ポリエチレンは、直鎮状分
子構造のエチレンとα−オレフィンとの共重合樹脂であ
る。一般に超低密度ポリエチレンは、密度Ｑ 、 ９１
ｇ、、ｙ ｃｘｎ３以下のものを言い、その分子量は
様々である。本発明者等は超低密度ポリエチレンの中で
も特に、■密度Ｏ６９０、／’（１）３以下、■重量平
均分子量１５万以上、■ヤング率３ ｋｇ 、ｆｆ１Ｉ
１１２以下という三つの条件を兼ね備えるものか他の超
低密度ポリエチレンに比しで著しく優れた特性、即ち耐
水トリー性、ｒａｎδ特性および゛絶縁抵抗を有するこ
とを見出だした。ここで、ヤング率（引張り弾性率）は
Ａ Ｓ Ｔ Ｍ規格Ｄ４１２（加硫ゴムの引張り試験）
によって規定される。The ultra-low density polyethylene in the present invention is a copolymer resin of ethylene and α-olefin having a straight chain molecular structure. Generally, ultra-low density polyethylene has a density Q of 91
g,,y cxn3 or less, and its molecular weight varies. Among ultra-low density polyethylenes, the present inventors particularly focused on: ■ Density O690, /'(1) 3 or less, ■ Weight average molecular weight 150,000 or more, ■ Young's modulus 3 kg, ff1I
It has been found that it has properties that are significantly superior to other ultra-low density polyethylenes, namely, water resistance, ran δ properties, and insulation resistance, as it satisfies the three conditions of 112 or less. Here, Young's modulus (tensile modulus) is according to ASTM standard D412 (Tensile test of vulcanized rubber)
defined by.
一般に水トリーは、非晶領域に凝集、成長！−た水滴か
、電界の作用によって変形し電界方向に進展していくも
のと考えられているか、上記■乃至■の要件を満たす、
結晶化度か低くまた分子鎖が長い超低密度ポリエチレン
は非晶領域か多い構造となっており、かつ、その非晶領
域のポリマー粘度が高いため、非晶領域における応力集
中および水滴の成長が抑制されて、本発明の優りを効果
を奏するものである。In general, water trees aggregate and grow into amorphous regions! - Are the water droplets deformed by the action of the electric field and considered to propagate in the direction of the electric field?
Ultra-low density polyethylene, which has a low crystallinity and long molecular chains, has a structure with many amorphous regions, and the polymer viscosity of the amorphous regions is high, causing stress concentration and water droplet growth in the amorphous regions. This suppresses the effects of the present invention.
本発明の電カケープルは、上記超低密度ポリエチレンを
ベースポリマーとして適宜添加剤など配合した絶縁組成
物を押出し等の常法で絶縁体またはシースとして被覆し
た後、有機過酸化物架橋（化学架橋）、電子線照射架橋
、シラン架橋等によって架橋して製造する。有機過酸化
物架橋剤としては、ジクミルパーオキサイド、２．５−
ジメチル−２，５−ジ（ｔ−ブチルパーオキシ）ヘキシ
ン−３，１，３−ビス−（ｔ−ブチルパーオキシイソプ
ロピル）ベンゼン等が好適する。また、必要に応じて、
４，４−チオビス（６−ターシャリブチル−３−メチル
フェノール）、テトラキス（メチレン−３（３，５−ジ
ャーブチル−４しドロキシフェニル）プロピオネート）
メタン等の老化防止剤を添加することもできる。The electrical cable of the present invention uses the ultra-low density polyethylene as a base polymer and coats it with an insulating composition containing appropriate additives as an insulator or sheath by a conventional method such as extrusion, and then crosslinks with organic peroxide (chemical crosslinking). , crosslinking by electron beam irradiation, silane crosslinking, etc. As the organic peroxide crosslinking agent, dicumyl peroxide, 2.5-
Dimethyl-2,5-di(t-butylperoxy)hexyne-3,1,3-bis-(t-butylperoxyisopropyl)benzene and the like are preferred. Also, if necessary,
4,4-thiobis(6-tert-butyl-3-methylphenol), tetrakis(methylene-3(3,5-gerbutyl-4-droxyphenyl)propionate)
Anti-aging agents such as methane can also be added.
（作用）
本発明の電力ゲーブルは、特定の要件を満たす超低密度
ポリエチレンをベースポリマーとしてこれを架橋したも
のを絶縁体またはシースとして用いているので、水分が
侵入してもその凝集および成長を抑制して、水トリーの
核−の形成を阻止するので耐水トリー性が大幅に向上す
ると共に、優れなｒａｎδ特性と絶縁抵抗を有している
。(Function) The power cable of the present invention uses a cross-linked ultra-low density polyethylene base polymer that meets specific requirements as an insulator or sheath, so even if moisture enters, it will not agglomerate or grow. Since the formation of water tree nuclei is inhibited, the water tree resistance is greatly improved, and it also has excellent ran delta characteristics and insulation resistance.
（実施例） 本発明の実施例について説明する。(Example) Examples of the present invention will be described.
実施例１
使用した超低密度ポリエチレンの密度は０．８９０ｇ／
ｃｍ’、重量平均分子量は１７万６千、ヤング率は２
、４９ ｋｇ、／ ｍｍ ２、メルトインデックスは１
．０であり、この超低密度ポリエチレン１゜０重量部に
対して架橋剤としてジクミルパーオキサイド１−６重量
部と、老化防止剤として４，４−チオビス−（６−ｔブ
チル−３メチルフエノール）（川口化学社製 商品名ア
ンテージクリスタル＞１１８重量部を添加した。この組
成物を混線機で充分混練した後、１ｍ厚さのシートを成
型し、図に示すようにこのシート１の底一部に銀ペイン
ト２を設けて接地電極とし、シート１の上部には水電極
３を設けて、これに６．６ｋＶ、１ｋＨ２の電圧を高圧
電極４により１６８時間課電した。Example 1 The density of the ultra-low density polyethylene used was 0.890 g/
cm', weight average molecular weight is 176,000, Young's modulus is 2
, 49 kg, / mm2, melt index is 1
．． 1-6 parts by weight of dicumyl peroxide as a crosslinking agent and 4,4-thiobis-(6-t-butyl-3-methylphenol) as an anti-aging agent per 1.0 parts by weight of this ultra-low density polyethylene. ) (manufactured by Kawaguchi Kagaku Co., Ltd., trade name: ANTAGE CRYSTAL>118 parts by weight was added. After thoroughly kneading this composition in a mixer, a sheet with a thickness of 1 m was formed, and the bottom of this sheet 1 was molded as shown in the figure. Silver paint 2 was provided on a part to serve as a ground electrode, and a water electrode 3 was provided on the top of the sheet 1, and a voltage of 6.6 kV and 1 kHz was applied to this by a high voltage electrode 4 for 168 hours.
このシート１をメチレンブルーで染色後、光学顕微鏡を
用いて水トリーの発生個数と伸びを観察しな。続けて、
水トリー発生後のシートのシａｎδ値と絶縁抵抗を測定
した。After staining this sheet 1 with methylene blue, observe the number and growth of water trees using an optical microscope. continue,
After water tree generation, the cyan δ value and insulation resistance of the sheet were measured.
さらに、上記組成物を２５０ｍｍ２の銅導体上に厚さ２
，５閣に押出して加熱架橋させて電カケープルを試作し
７′？９得られたケーブルを１．５ｍ長さの短尺試料と
して、６．６ｋＶ、１ｋＨｚの電圧を室温で３０日間課
電した後の水トリーの発生個数およびトリーの最大長さ
を観察しな。結果を表に示す。Furthermore, the above composition was applied to a thickness of 2 on a 250 mm2 copper conductor.
, I extruded it into five layers and cross-linked it by heating to make a prototype electric cable.7'? 9 Use the obtained cable as a short sample with a length of 1.5 m, and observe the number of water trees generated and the maximum length of the trees after applying a voltage of 6.6 kV, 1 kHz at room temperature for 30 days. The results are shown in the table.
比較例１〜４
比較として表に示すように、ヤング率と重量平均分子量
か範囲を外れる超低密度ポリエチレンを使用した場合（
比較例１）、重量平均分子量のみが範囲を外れる超低密
度ポリエチレンを使用した場合（比較例２）、密度、ヤ
ング率と重量平均分子量のすべてが範囲を外れる低密度
ポリエチレンを使用した場合（比較例３〜４）について
実施例１と同様にシートおよび短尺ケーブルを作成し、
同様に試験しな。結果を表に示す。Comparative Examples 1 to 4 As shown in the table for comparison, when using ultra-low density polyethylene whose Young's modulus and weight average molecular weight are outside the range (
Comparative Example 1), when using ultra-low density polyethylene in which only the weight average molecular weight is out of the range (Comparative Example 2), and when using low density polyethylene in which density, Young's modulus and weight average molecular weight are all out of the range (Comparative Example 2). For Examples 3 to 4), sheets and short cables were created in the same manner as in Example 1,
Do the same test. The results are shown in the table.
（発明の効果）
以上、本発明の電カケープルは、耐水トリー性が大幅に
向上すると共に、優れたｔａｎδ特性と絶縁抵抗を有し
ている。(Effects of the Invention) As described above, the power cable of the present invention has significantly improved water resistance, as well as excellent tan δ characteristics and insulation resistance.
図面は、本発明における水トリー試験方法を示す図であ
る。The drawings are diagrams showing the water tree test method in the present invention.
Claims (1)
１５万以上で、かつヤング率３ｋｇ／ｍｍ＾２以下の超
低密度ポリエチレンを主成分とする絶縁体を架橋させて
なることを特徴とする電力ケーブル。(1) It is characterized by being made by crosslinking an insulator whose main component is ultra-low density polyethylene with a density of 0.90 g/cm^3 or less, a weight average molecular weight of 150,000 or more, and a Young's modulus of 3 kg/mm^2 or less. and power cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2241802A JPH04121908A (en) | 1990-09-11 | 1990-09-11 | Power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2241802A JPH04121908A (en) | 1990-09-11 | 1990-09-11 | Power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04121908A true JPH04121908A (en) | 1992-04-22 |
Family
ID=17079728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2241802A Pending JPH04121908A (en) | 1990-09-11 | 1990-09-11 | Power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04121908A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210139671A1 (en) * | 2017-08-30 | 2021-05-13 | Dow Global Technologies Llc | Peroxide containing polyolefin formulations |
-
1990
- 1990-09-11 JP JP2241802A patent/JPH04121908A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210139671A1 (en) * | 2017-08-30 | 2021-05-13 | Dow Global Technologies Llc | Peroxide containing polyolefin formulations |
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