JPH05198218A - Dc power cable - Google Patents
Dc power cableInfo
- Publication number
- JPH05198218A JPH05198218A JP4027405A JP2740592A JPH05198218A JP H05198218 A JPH05198218 A JP H05198218A JP 4027405 A JP4027405 A JP 4027405A JP 2740592 A JP2740592 A JP 2740592A JP H05198218 A JPH05198218 A JP H05198218A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene
- cable
- power cable
- resin composition
- insulator
- 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.)
- Granted
Links
Landscapes
- Insulated Conductors (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、直流電力ケーブルに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power cable.
【０００２】[0002]
【従来の技術】長距離、大容量送電を目的とする場合、
直流送電は交流に比べ絶縁体の誘電損失がなく、充電電
流に対する無効力を補償するための設備が不要である、
又、絶縁体の絶縁耐圧が高く安定である等種々の特徴か
ら有利と考えられている。2. Description of the Related Art For the purpose of long-distance, large-capacity power transmission,
Compared to alternating current, direct current transmission has no dielectric loss of the insulator and does not require equipment for compensating reactive force against charging current.
Further, it is considered to be advantageous because of various characteristics such as high withstand voltage and stability of the insulator.
【０００３】現在、直流送電のため、高電圧直流ケーブ
ルは、おもに低粘度の絶縁油と紙からなるＯＦケーブル
が用いられているが、給油設備等必要でありメンテナン
スが面倒である。一方、メンテナンスフリーであるプラ
スチック絶縁ケーブルは、交流電力ケーブルとして架橋
ポリエチレン（ＸＬＰＥ）ケーブルが広く用いられてお
り、ＯＦケーブルに匹敵する超高電圧ケーブルまで開発
されつつある。しかし、直流電圧に対する空間電荷特性
等の問題から、高電圧直流ケーブルとしては用途が限定
されている。Currently, for DC power transmission, an OF cable mainly made of low-viscosity insulating oil and paper is used as a high-voltage DC cable, but maintenance is troublesome because an oil supply facility is required. On the other hand, as a maintenance-free plastic insulated cable, a cross-linked polyethylene (XLPE) cable is widely used as an AC power cable, and a super high voltage cable comparable to an OF cable is being developed. However, due to problems such as space charge characteristics with respect to DC voltage, its application is limited as a high voltage DC cable.
【０００４】すなわちＸＬＰＥケーブルでは直流高電圧
印加によって絶縁体中に逆極性の空間電荷が蓄積され、
逆極性のインパルスや直流極性反転がなされた場合、そ
の絶縁特性の低下が著しいという理由からである。以上
の様な理由から、従来のＸＬＰＥケーブルにかわるＸＬ
ＰＥケーブルの開発がのぞまれている。That is, in the XLPE cable, space charges having opposite polarities are accumulated in the insulator by applying a high DC voltage,
This is because when the reverse polarity impulse or the direct current polarity inversion is performed, the deterioration of the insulating property is remarkable. For the above reasons, XL replaces the conventional XLPE cable.
Development of PE cable is desired.
【０００５】[0005]
【発明が解決しようとする課題】一般にポリエチレンの
絶縁耐圧強度は、結晶化度が高い程高いとされている
が、直流電圧を印加した場合電極から電荷が注入されて
形成される空間電荷は、ポリエチレンの結晶と非晶の界
面等にトラップされ易いと推定される。また、過電流が
流れた場合等の加熱による変形等に耐えられるための対
策として架橋処理がとられるが、架橋剤として用いられ
る有機過酸化物の分解残渣は空間電荷の形成を増大させ
ることが知られている。Generally, the higher the crystallinity is, the higher the dielectric strength of polyethylene is, but the space charge formed by injecting charges from the electrodes when a DC voltage is applied is It is presumed that the polyethylene is likely to be trapped at the crystal-amorphous interface. Further, a crosslinking treatment is taken as a measure to withstand deformation due to heating when an overcurrent flows, but the decomposition residue of the organic peroxide used as a crosslinking agent may increase the formation of space charge. Are known.
【０００６】このような観点から、本発明者等は、上記
の空間電荷特性が同じＰＥでも重合法により異なること
から重合法を選び重合された無極性のポリエチレンに特
定の極性モノマーを添加架橋により共重合することによ
り、又、特定の有機過酸化物を用いることにより分解残
渣の影響は少なくなり直流特性の改善が可能であると考
え検討を進めた。From this point of view, the inventors of the present invention selected a polymerization method because the PEs having the same space charge characteristics were different depending on the polymerization method, and added a specific polar monomer to the polymerized nonpolar polyethylene to crosslink it. We considered that the effect of decomposition residues would be reduced by copolymerization or by using a specific organic peroxide, and that the direct current characteristics could be improved.
【０００７】そこでこの発明は、特定の重合法により重
合されたポリエチレンを特定し、添加する極性モノマー
を特定して、絶縁体中の空間電荷の蓄積を抑制すること
により、さらに分解残渣の影響の少ない有機過酸化物を
用いることにより高い絶縁特性を持ちかつ、耐熱性の良
い架橋ポリエチレンを得、これを絶縁体として使用する
ことにより高性能の特性を有する直流電力ケーブルを提
供することを目的とする。Therefore, the present invention specifies the polyethylene polymerized by a specific polymerization method, specifies the polar monomer to be added, and suppresses the accumulation of space charge in the insulator, thereby further reducing the influence of decomposition residues. By using a small amount of organic peroxide, crosslinked polyethylene having high insulation characteristics and good heat resistance is obtained, and by using this as an insulator, a DC power cable having high performance characteristics is provided. To do.
【０００８】[0008]
【課題を解決するための手段】上記のような課題を解決
するため、この発明は、極性モノマーとポリエチレン
（ＰＥ）と有機酸化物からなる樹脂組成物を加熱により
架橋させてなる架橋樹脂組成物を絶縁体とした構成を採
用したものである。In order to solve the above problems, the present invention provides a crosslinked resin composition obtained by crosslinking a resin composition comprising a polar monomer, polyethylene (PE) and an organic oxide by heating. Is adopted as an insulator.
【０００９】[0009]
【作用】極性モノマーである無水マレイン酸等のカルボ
ン酸などが架橋時にポリエチレンにグラフトされ極性基
として働き、均一に材料中に分布するため、空間電荷の
局部的なトラップを防止することができ、又、直鎖状低
密度ポリエチレンは、同じ低圧法で重合して得られる高
結晶化度をもつ低圧法ポリエチレン（高密度ポリエチレ
ン；ＨＤＰＥ）に比べ、結晶性は低いが高圧法ポリエチ
レン（低密度ポリエチレン；ＬＤＰＥ）のような分岐、
長い側鎖等の不規則を持たないため、空間電荷のトラッ
プを低減させると考えられる。このような空間電荷の低
減により直流破壊強度が改善される。又、分解温度の高
い有機過酸化物の分解残渣は空間電荷蓄積がすくないも
のと考えられる。[Function] A polar monomer such as carboxylic acid such as maleic anhydride is grafted to polyethylene at the time of crosslinking and acts as a polar group and is uniformly distributed in the material, so that local trapping of space charge can be prevented. Also, linear low-density polyethylene has a lower crystallinity than high-pressure polyethylene (high-density polyethylene; HDPE) having high crystallinity obtained by polymerizing by the same low-pressure method, but high-pressure polyethylene (low-density polyethylene). ; LDPE) like branch,
Since it does not have irregularities such as long side chains, it is considered that space charge traps are reduced. The reduction of the space charge improves the DC breakdown strength. Further, it is considered that the decomposition residue of the organic peroxide having a high decomposition temperature does not easily accumulate space charges.
【００１０】[0010]
【実施例】以下、この発明の実施例を説明する。Embodiments of the present invention will be described below.
【００１１】この発明の直流電力ケーブルは、極性モノ
マーとポリエチレン（ＰＥ）と有機過酸化物からなる樹
脂組成物を加熱により架橋させてなる架橋樹脂組成物を
用いて絶縁体を形成した構造になっている。The DC power cable of the present invention has a structure in which an insulator is formed by using a crosslinked resin composition obtained by crosslinking a resin composition composed of a polar monomer, polyethylene (PE) and an organic peroxide by heating. ing.
【００１２】上記絶縁体の形成において、ポリエチレン
に極性モノマー、例えば無水マレイン酸などを添加した
混合物に１３０℃での半減期が５Ｈｒ以上なる有機過酸
化物、例えば２，５ジメチル２，５ジ（ｔ−ブチルペル
オキシ）ヘキシン−３などを用いて架橋させた架橋樹脂
組成物を絶縁体に用いることにより、空間電荷蓄積を含
めた直流特性に優れた直流電力ケーブルが出来ることが
わかった。In the formation of the above-mentioned insulator, an organic peroxide having a half-life at 130 ° C. of 5 Hr or more, such as 2,5 dimethyl 2,5 di (, in a mixture of polyethylene and a polar monomer such as maleic anhydride is added. It has been found that a DC power cable having excellent DC characteristics including space charge accumulation can be obtained by using as an insulator a crosslinked resin composition crosslinked using t-butylperoxy) hexyne-3 or the like.
【００１３】通常絶縁材料に添加される安定剤なども添
加されても問題ない。There is no problem even if a stabilizer or the like which is usually added to the insulating material is added.
【００１４】上記極性モノマーとして用いる無水マレイ
ン酸が有効であり、ポリエチレンとしてはポリエチレン
を重合する際にブテン−１、ヘキセン−１、４−メチル
ペンテン−１、オクテン−１、等を添加することにより
一定の長さ（炭素数２から６程度の）側鎖をポリエチレ
ンに導入することにより得られるＪＩＳ Ｋ６７４８に
規定されているような、結晶性は高くは無いものの規則
性に優れた中低圧法により重合され比重０．９４g/cm3
以下の範囲の直鎖状低密度ポリエチレン、又は比重０．
９４g/cm3 以上である高密度ポリエチレンが用いられ
る。Maleic anhydride used as the polar monomer is effective, and as the polyethylene, butene-1, hexene-1, 4-methylpentene-1, octene-1, etc. are added when polyethylene is polymerized. By the medium- and low-pressure method, which does not have high crystallinity but has excellent regularity, as defined in JIS K6748, which is obtained by introducing a side chain of a certain length (having about 2 to 6 carbon atoms) into polyethylene. Polymerized and specific gravity 0.94 g / cm 3
Linear low-density polyethylene in the following range, or specific gravity of 0.
High density polyethylene of 94 g / cm 3 or more is used.
【００１５】表１にこの発明の実施例と比較例について
記した。以下に詳細述べる。Table 1 shows examples and comparative examples of the present invention. The details will be described below.
【００１６】実験サンプルは、各種ポリエチレン及びそ
れらに極性モノマーとして無水マレイン酸を、また架橋
剤として有機過酸化物としてジクミルペルオキシド（Ｄ
ＣＰ）、２，５ジメチル２，５ジ（ｔ−ブチルペルオキ
シ）ヘキサン（ＡＰＯ）または、２，５ジメチル２，５
ジ（ｔ−ブチルペルオキシ）ヘキシン−３（ＹＰＯ）を
１重量部混合したものを、１８０℃３０分の条件で熱プ
レスにより作成したシートを用いた。空間電荷蓄積の評
価は２mmシートに２０ｋｖ課電後パルス静電応力法によ
り測定した。蓄積電荷量の量は＋の数で示した。ＤＣ破
壊は０．２mmシートを用い９０℃で測定した。The experimental samples were various polyethylenes and maleic anhydride as a polar monomer thereof, and dicumyl peroxide (D) as an organic peroxide as a crosslinking agent.
CP), 2,5 dimethyl 2,5 di (t-butylperoxy) hexane (APO) or 2,5 dimethyl 2,5
A sheet prepared by hot pressing a mixture of 1 part by weight of di (t-butylperoxy) hexyne-3 (YPO) at 180 ° C. for 30 minutes was used. The space charge accumulation was evaluated by applying a pulse electrostatic stress method to a 2 mm sheet after applying 20 kv. The amount of accumulated charge is indicated by the number of +. DC breakdown was measured at 90 ° C. using a 0.2 mm sheet.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表中の語句の説明 ＤＣＰ：ジクミルペルオキシド（１３０℃での半減期
１．８Ｈｒ） ＡＰＯ：２，５ジメチル２，５ジ（ｔ−ブチルペルオキ
シ）ヘキサン（同５，６Ｈｒ） ＹＰＯ：２，５ジメチル２，５ジ（ｔ−ブチルペルオキ
シ）ヘキシン−３（同８．６Ｈｒ） 空間電荷：Ｍ：ホモ電荷蓄積 Ｒ：ヘテロ電荷蓄積 表１に空間電荷分布の測定結果を示す。電極近傍にＤＣ
課電極性と同極性の電荷蓄積されている場合ホモ電荷蓄
積、その逆の場合ヘテロ電荷蓄積。Explanation of terms in the table DCP: dicumyl peroxide (half-life at 130 ° C. 1.8 Hr) APO: 2,5 dimethyl 2,5 di (t-butylperoxy) hexane (5,6 Hr) YPO: 2,5 Dimethyl 2,5 di (t-butylperoxy) hexyne-3 (8.6 Hr) Space charge: M: Homo charge accumulation R: Hetero charge accumulation Table 1 shows the measurement results of the space charge distribution. DC near the electrode
Homogeneous charge accumulation when charge of the same polarity as the sectioning property is accumulated, and hetero charge accumulation when the opposite charge is accumulated.
【００１９】[0019]
【発明の効果】以上詳細に説明したように、この発明に
よれば、極性モノマーとポリエチレンの混合物と１３０
℃での半減期５Ｈｒ以上の有機過酸化物により架橋させ
たものを絶縁体に用いることにより、直流高電圧印加に
よる空間電荷蓄積を防止できＸＬＰＥ絶縁ケーブルと同
様に耐熱性の良い直流高電圧ケーブルができる。As described in detail above, according to the present invention, a mixture of polar monomer and polyethylene and 130
By using an insulator that has been cross-linked with an organic peroxide with a half-life of 5 hours or more at ℃, it is possible to prevent the accumulation of space charge due to the application of a high DC voltage, and a DC high-voltage cable with good heat resistance similar to XLPE insulated cables You can
Claims (3)
有機過酸化物からなる樹脂組成物を加熱により架橋させ
てなる架橋樹脂組成物を絶縁体としたことを特徴とする
直流電力ケーブル。1. A DC power cable comprising a cross-linked resin composition obtained by cross-linking a resin composition comprising a polar monomer, polyethylene (PE) and an organic peroxide by heating as an insulator.
以下の直鎖状低密度ポリエチレン、又は、比重０．９４
g/cm3 以上である高密度ポリエチレンであることを特徴
とする請求項１に記載の直流電力ケーブル。2. A polyethylene having a specific gravity of 0.94 g / cm 3
The following linear low density polyethylene or specific gravity 0.94
The DC power cable according to claim 1, which is a high-density polyethylene having a g / cm 3 or more.
期が５Ｈｒ以上のものを用いたことを特徴とする請求項
１に記載の直流電力ケーブル。3. The DC power cable according to claim 1, wherein an organic peroxide having a half-life at 130 ° C. of 5 Hr or more is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02740592A JP3275343B2 (en) | 1992-01-17 | 1992-01-17 | DC power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02740592A JP3275343B2 (en) | 1992-01-17 | 1992-01-17 | DC power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05198218A true JPH05198218A (en) | 1993-08-06 |
| JP3275343B2 JP3275343B2 (en) | 2002-04-15 |
Family
ID=12220171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02740592A Expired - Lifetime JP3275343B2 (en) | 1992-01-17 | 1992-01-17 | DC power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3275343B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100314022A1 (en) * | 2008-02-20 | 2010-12-16 | Abb Research Ltd. | Method for providing an insulated electric high voltage dc cable or a high voltage dc termination or joint |
| CN106531316A (en) * | 2016-10-17 | 2017-03-22 | 安徽省绿环电气股份有限公司 | Crosslinked polyethylene power cable with electrical tree aging preventive function |
-
1992
- 1992-01-17 JP JP02740592A patent/JP3275343B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100314022A1 (en) * | 2008-02-20 | 2010-12-16 | Abb Research Ltd. | Method for providing an insulated electric high voltage dc cable or a high voltage dc termination or joint |
| US8398803B2 (en) * | 2008-02-20 | 2013-03-19 | Abb Research Ltd. | Method for providing an insulated electric high voltage DC cable or a high voltage DC termination or joint |
| CN106531316A (en) * | 2016-10-17 | 2017-03-22 | 安徽省绿环电气股份有限公司 | Crosslinked polyethylene power cable with electrical tree aging preventive function |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3275343B2 (en) | 2002-04-15 |
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