JPH0246604A - Power cable - Google Patents
Power cableInfo
- Publication number
- JPH0246604A JPH0246604A JP19604088A JP19604088A JPH0246604A JP H0246604 A JPH0246604 A JP H0246604A JP 19604088 A JP19604088 A JP 19604088A JP 19604088 A JP19604088 A JP 19604088A JP H0246604 A JPH0246604 A JP H0246604A
- Authority
- JP
- Japan
- Prior art keywords
- water
- polyethylene
- power cable
- water tree
- maleic acid
- 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
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 9
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims abstract description 9
- 239000011976 maleic acid Substances 0.000 claims abstract description 9
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000004020 conductor Substances 0.000 claims abstract 3
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims description 5
- 240000005572 Syzygium cordatum Species 0.000 abstract description 14
- 235000006650 Syzygium cordatum Nutrition 0.000 abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 239000012212 insulator Substances 0.000 abstract description 7
- 239000004698 Polyethylene Substances 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 6
- -1 polyethylene Polymers 0.000 abstract description 6
- 229920000573 polyethylene Polymers 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000036425 denaturation Effects 0.000 abstract 2
- 238000004925 denaturation Methods 0.000 abstract 2
- 229920000642 polymer Polymers 0.000 abstract 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 6
- 239000004703 cross-linked polyethylene Substances 0.000 description 6
- 239000003431 cross linking reagent Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 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 4
- 239000003963 antioxidant agent Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- ODBCKCWTWALFKM-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhex-3-yne Chemical compound CC(C)(C)OOC(C)(C)C#CC(C)(C)OOC(C)(C)C ODBCKCWTWALFKM-UHFFFAOYSA-N 0.000 description 1
- 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
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920001600 hydrophobic polymer Polymers 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001590 oxidative 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
- 238000010998 test method Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Organic Insulating Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は架橋ポリエチレンを絶縁層とする電カケープル
の改良に係り、特に水トリーの発生を抑止した電カケー
プルに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an electrical cable having an insulating layer made of crosslinked polyethylene, and particularly to an electrical cable that suppresses the occurrence of water trees.
（従来の技術）
ポリエチレンは優れた電気絶縁性と加工のし易さから、
今日では電カケープルの絶縁体の主流をなしており、特
に架橋により熱的特性を向上させた架橋ポリエチレンケ
ーブル（ＸＬＰＥケーブル）が広く汎用されてきている
。(Conventional technology) Polyethylene has excellent electrical insulation properties and is easy to process.
Today, it is the mainstream insulator for power cables, and in particular, crosslinked polyethylene cables (XLPE cables) whose thermal properties have been improved by crosslinking have become widely used.
（発明が解決すべき課題）
このＸＬＰＥケーブルの弱点は、同ケーブル特有の現象
として、絶縁尿中の水分と局部的異常電界の存在によっ
て水トリーが発生し、ケーブルの絶縁性能が低下するこ
とである。(Problem to be solved by the invention) The weakness of this XLPE cable is that water treeing occurs due to moisture in the insulating urine and the presence of local abnormal electric fields, which is a phenomenon unique to the cable, and the insulation performance of the cable deteriorates. be.
水が集中することによって起るものと考えられるところ
から、極性基を有し、ある程度親水化することによって
局部的に異常電界部に水が集中するのを防止すれば、耐
水トリー性の改善に効果が得られるものと考えらｔし
本発明にはこの想定を超低密度ポリエチレンにマレイン
酸変性することにより具現したものであり、マレイン酸
変性の量は特に０．５〜５重量％であることを見出した
ものである。This is thought to be caused by concentration of water, so if water is prevented from locally concentrating in the abnormal electric field by having a polar group and making it hydrophilic to some extent, water resistance can be improved. It was thought that this effect could be obtained, and the present invention has realized this assumption by modifying ultra-low density polyethylene with maleic acid, and the amount of maleic acid modification is particularly 0.5 to 5% by weight. This is what I discovered.
（課題を解決するための手段）
本発明は上記の従来の技術における課題を解決しようと
するものであり、その概要は導体の外部に、０．５〜５
重量％のマレイン酸変性を施した超低密度ポリエチレン
を絶縁層として設けたことを特徴とする電カケープルで
ある。(Means for Solving the Problems) The present invention attempts to solve the problems in the above-mentioned conventional technology.
This electrical cable is characterized by having an insulating layer made of ultra-low density polyethylene modified with maleic acid in a weight percent range.
（作用）
ＸＬＰＥ絶縁体中の水トリーは疎水性ポリマーであるポ
リエチレン中に局部的に異常電界があると、そこに水が
集中することによって起ると考えられる。(Function) Water trees in XLPE insulators are thought to occur when water is concentrated in polyethylene, which is a hydrophobic polymer, when there is an abnormal electric field locally.
従って、極性基を付与し、ある程度親水化することによ
って、局部的異常電界部に水が集中するのを防ぎ、耐水
トリー性の改善に効果が得られるものと考えられる。Therefore, it is considered that by adding a polar group and making it hydrophilic to some extent, it is possible to prevent water from concentrating in the local abnormal electric field area and to improve the water resistance.
ここにマレイン酸変性の量を０．５重量％未満とすると
きは水トリー抑制の効果が少なく、５重量％を超えた場
合は絶縁体の電気特性特にｔａｎδが悪化するので、好
ましい範囲は０．５〜５重量％である。When the amount of maleic acid modification is less than 0.5% by weight, the effect of suppressing water tree is small, and when it exceeds 5% by weight, the electrical properties of the insulator, especially tan δ, deteriorate, so the preferred range is 0. .5 to 5% by weight.
本発明の実施に際しては通常用いられる他の配合剤例え
ば酸化防止剤、架橋剤を添加することができるが、酸化
防止剤としては４．４−チオビス（６−ターシャリ−ブ
チル−３−メチルフェノール）やテトラキス〔メチレン
−３（３，５−ジ−ｔ−ブチル−４−ヒドロキシ−フェ
ノニル）プロピオネートコメタン等があり、添加量は０
．２〜０．３重量部が好ましい。When carrying out the present invention, other commonly used compounding agents such as antioxidants and crosslinking agents can be added, but the antioxidant is 4,4-thiobis(6-tert-butyl-3-methylphenol). and tetrakis[methylene-3(3,5-di-t-butyl-4-hydroxy-phenonyl)propionate comethane, etc., and the amount added is 0
．． 2 to 0.3 parts by weight is preferred.
この架橋剤としてはジクミルパーオキサイド（Ｄ ＣＰ
）や２．５−ジメチル−２，５−ジ（ｔ−ブチルパーオ
キシ）ヘキシン−３等があり、その添加量は１．５〜２
．５重量部が好ましい。As this crosslinking agent, dicumyl peroxide (D CP
) and 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, etc., and the amount added is 1.5 to 2.
．． 5 parts by weight is preferred.
上記酸化防止剤や架橋剤以外のものを用いてもよいし、
又他の添加剤を添加配合してもよい。Things other than the above antioxidants and crosslinking agents may be used,
Further, other additives may be added and blended.
以下余白
（実施例）
マレイン酸変性量が、０．５％、２％、５％の超低密度
ポリエチレン（ＵＬＤＰＥ） １００重量部に対し、架
橋剤のＤＣＰを２重量部と酸化劣化防止剤の４．糾チオ
ビス（６−ターシャリ−ブチル−３−メチルフェノール
）を０．３重量部添加し、絶縁組成物を得た。（実施例
■〜■）
また比較のために、マレイン酸変性量が ０．２％、１
０％のＵＬＤＰＨに、上記と同様に架橋剤と酸化防止剤
を添加し、絶縁組成物を得た。（比較例■〜■）
上記の各絶縁組成物（実施例■〜■、比較例■〜■）を
１６０℃、４０分の条件でプレス成形し、以下に示す水
トリー試験、誘電正接（ｔａｎδ）測定試験を行なった
。その結果を第１表に併記しである。The following margin (Example) For 100 parts by weight of ultra-low density polyethylene (ULDPE) with maleic acid modification of 0.5%, 2%, and 5%, 2 parts by weight of DCP as a crosslinking agent and 2 parts by weight of DCP as an oxidative deterioration inhibitor. 4. 0.3 parts by weight of thiobis (6-tert-butyl-3-methylphenol) was added to obtain an insulating composition. (Examples ■ to ■) For comparison, the amount of maleic acid modification was 0.2%, 1
A crosslinking agent and an antioxidant were added to 0% ULDPH in the same manner as above to obtain an insulating composition. (Comparative Examples ■ to ■) Each of the above-mentioned insulating compositions (Examples ■ to ■, Comparative Examples ■ to ■) was press-molded at 160°C for 40 minutes, and the water tree test and dielectric loss tangent (tan δ ) A measurement test was conducted. The results are also listed in Table 1.
このプレス成形後、ゲル分率の測定を１１０℃のキシレ
ンに２４時間浸漬して行なったところ、ゲル分率は、８
５％以上であり、十分架橋されていることが判った。After this press molding, the gel fraction was measured by immersing it in xylene at 110°C for 24 hours, and the gel fraction was 8.
It was found that the crosslinking content was 5% or more, indicating that the crosslinking was sufficient.
（１１水トリー試験
第１図に示した如く、厚さ５ ａｍの試験試料ｌの底面
に導電性塗料の塗布層２を設けて、接地側電極とすると
共に、試験試料ｌの上面には水槽３を設けて水電極を形
成し、これ〜１０ ＫＶ、Ｉ ＫＨｚの電圧を印加でき
るように構成し、上記電圧を３０日間印加後、試料を煮
沸して水トリーを観察した。(11 Water Tree Test As shown in Figure 1, a coating layer 2 of conductive paint is provided on the bottom surface of the test sample 1 with a thickness of 5 am to serve as a grounding electrode, and a water tank is placed on the top surface of the test sample 1. 3 was provided to form a water electrode, which was configured to be able to apply a voltage of ~10 KV, I KHz, and after applying the voltage for 30 days, the sample was boiled and water trees were observed.
５０μｍ以上の水トリー発生密度を観察し、比較例■の
試料（ＸＬＰＥのみの場合）の発生数１００に対する相
対数として表示した。The occurrence density of water trees of 50 μm or more was observed and expressed as a relative number to the number of occurrences of 100 in the sample of Comparative Example ① (XLPE only).
（２）誘電正接（ｔａｎδ）測定試験
１ｍｍ厚さのシート試料とし、これに１にｖ 、５０Ｋ
Ｈｚの電圧を印加し、シェーリングブリッジにより測定
した。(2) Dielectric loss tangent (tan δ) measurement test A sheet sample with a thickness of 1 mm is used, and a voltage of 1 V and 50K is used.
A voltage of Hz was applied and measurements were made using a Schering bridge.
それらの結果を纒めて表示したのが第１表である。Table 1 summarizes and displays those results.
第１表
ば、水トリー発生が効果的に抑制され、かつ電気特性も
良好な絶縁組成物が得られ、またこの組成物をケーブル
の絶縁体として用いることにより、優れた電カケープル
を得ることができる。Table 1 shows that an insulating composition that effectively suppresses water tree generation and has good electrical properties can be obtained, and that an excellent electric cable can be obtained by using this composition as a cable insulator. can.
第１図は本発明において行なわれる水トリー試験の方法
を示した断面図である。
図中 １：試験試料、 ２：塗料層
３：水槽
第１表から本発明の実施例の試料の場合、水ト代理人
弁理士 竹 内 ９
合は、水トリー発生密度が極めて大きく、また−部の試
料において、電気特性の低下が認められた。
〈発明の効果〉FIG. 1 is a sectional view showing the water tree test method used in the present invention. In the figure 1: Test sample, 2: Paint layer 3: Water tank In the case of the sample of the example of the present invention from Table 1, the water tank agent
Patent Attorney Takeuchi 9 In the sample, the density of water tree generation was extremely high, and in the - sample, a decrease in electrical properties was observed. <Effect of the invention>
Claims (1)
した超低密度ポリエチレンを絶縁層、として設けたこと
を特徴とする電力ケーブルA power cable characterized in that an ultra-low density polyethylene modified with 0.5 to 5% by weight of maleic acid is provided as an insulating layer on the outside of the conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19604088A JPH0246604A (en) | 1988-08-08 | 1988-08-08 | Power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19604088A JPH0246604A (en) | 1988-08-08 | 1988-08-08 | Power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0246604A true JPH0246604A (en) | 1990-02-16 |
Family
ID=16351195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19604088A Pending JPH0246604A (en) | 1988-08-08 | 1988-08-08 | Power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0246604A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5594387A (en) * | 1994-06-29 | 1997-01-14 | Nec Corporation | Amplifier circuit having nagative feedback loop for self-bias |
-
1988
- 1988-08-08 JP JP19604088A patent/JPH0246604A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5594387A (en) * | 1994-06-29 | 1997-01-14 | Nec Corporation | Amplifier circuit having nagative feedback loop for self-bias |
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