JPH0620530A - Water tree resistant cable - Google Patents
Water tree resistant cableInfo
- Publication number
- JPH0620530A JPH0620530A JP4173377A JP17337792A JPH0620530A JP H0620530 A JPH0620530 A JP H0620530A JP 4173377 A JP4173377 A JP 4173377A JP 17337792 A JP17337792 A JP 17337792A JP H0620530 A JPH0620530 A JP H0620530A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- semiconductive
- cable
- polyethylene
- water tree
- 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.)
- Withdrawn
Links
- 240000005572 Syzygium cordatum Species 0.000 title abstract description 19
- 235000006650 Syzygium cordatum Nutrition 0.000 title abstract description 19
- 239000012212 insulator Substances 0.000 claims abstract description 15
- 239000004020 conductor Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000004698 Polyethylene Substances 0.000 abstract description 20
- -1 polyethylene Polymers 0.000 abstract description 20
- 229920000573 polyethylene Polymers 0.000 abstract description 20
- 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 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 238000004132 cross linking Methods 0.000 abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000003431 cross linking reagent Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 9
- 229920003020 cross-linked polyethylene Polymers 0.000 description 4
- 239000004703 cross-linked polyethylene Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012360 testing method Methods 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐水トリー性を向上さ
せたケーブルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable having improved water tree resistance.
【０００２】[0002]
【従来の技術】従来から、高圧電力ケーブルとして架橋
ポリエチレン絶縁ケーブルが汎用されている。この架橋
ポリエチレン絶縁ケーブルは、一般に、導体上に、三層
同時押出により内部半導電層、架橋ポリエチレン絶縁体
層、外部半導電層を形成し、その外周に外被を被覆して
構成されており、絶縁耐力、体積固有抵抗が高く、誘電
率や誘電正接が小さいなどの特徴を有している。2. Description of the Related Art Conventionally, a crosslinked polyethylene insulated cable has been widely used as a high voltage power cable. This crosslinked polyethylene insulated cable is generally constructed by forming an inner semiconductive layer, a crosslinked polyethylene insulation layer, and an outer semiconductive layer on a conductor by three-layer coextrusion, and covering the outer circumference with a jacket. It has high dielectric strength, high volume resistivity, and low dielectric constant and dielectric loss tangent.
【０００３】ところで、この種のケーブルにおいては、
水トリーが発生すると電気特性が大きく劣化することが
知られている。このため、従来より、かかる耐水トリー
性を改善すべく、様々な研究がなされている。By the way, in this type of cable,
It is known that when a water tree is generated, electrical characteristics are greatly deteriorated. For this reason, various studies have been conventionally performed to improve such water resistance tree resistance.
【０００４】このような中で、近時、この水トリーの発
生および進展に、絶縁体層中に混入したイオン性不純物
が大きく関与し、かつ、このイオン性不純物の混入の主
たる原因が内部および外部半導電層中に含まれる導電性
カーボンにあることが明らかになってきた。Under these circumstances, recently, the generation and development of this water tree is greatly influenced by the ionic impurities mixed in the insulator layer, and the main causes of the mixing of the ionic impurities are internal and internal. It has become clear that it is in the conductive carbon contained in the outer semiconductive layer.
【０００５】このため、たとえば、半導電層の形成に使
用する導電性カーボンの種類を変えたり、その管理を徹
底したり、あるいはイオン性不純物の影響を抑制する添
加剤を使用することによって、イオン性不純物の絶縁体
層への混入もしくは影響を抑え、これによって、ケーブ
ルの耐水トリー性を向上させようとする試みがなされて
きている。Therefore, for example, by changing the type of conductive carbon used for forming the semiconductive layer, thoroughly controlling it, or by using an additive that suppresses the influence of ionic impurities, Attempts have been made to suppress the contamination or influence of the conductive impurities on the insulating layer, thereby improving the water resistance of the cable.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
たような導電性カーボンの選択や管理、添加剤の使用と
いった対策では、イオン性不純物の絶縁体層への混入、
あるいはその影響を十分に防止することができず、耐水
トリー性を大きく向上させることができなかった。 本
発明はこのような点に対処してなされたもので、イオン
性不純物の絶縁体層への混入が防止され、耐水トリー性
が大幅に向上したケーブルを提供することを目的とす
る。However, in the measures such as the selection and management of the conductive carbon and the use of the additive as described above, mixing of ionic impurities into the insulating layer,
Alternatively, the effect could not be sufficiently prevented and the water tree resistance could not be greatly improved. The present invention has been made in consideration of such a point, and an object of the present invention is to provide a cable in which ionic impurities are prevented from being mixed into the insulating layer and the water tree resistance is significantly improved.
【０００７】[0007]
【課題を解決するための手段】本発明の耐水トリー性ケ
ーブルは、導体上に、内部半導電層、絶縁体層、外部半
導電層、および外被を順に形成してなるケーブルにおい
て、前記絶縁体層の前記内部および外部半導電層との界
面およびその近傍が、ゲル分率85％、好ましくは86〜90
％の以上の高架橋度層であることを特徴としている。A water resistant tree cable according to the present invention is a cable in which an inner semiconductive layer, an insulator layer, an outer semiconductive layer, and an outer cover are sequentially formed on a conductor. The interface between the internal and external semiconductive layers of the body layer and its vicinity is 85% gel fraction, preferably 86-90.
% Or more of the high cross-linking layer.
【０００８】本発明において、ゲル分率85％以上の高架
橋度層は、内部または外部半導電層との界面より 0.5mm
以上の厚さを有することが望ましく、したがって、絶縁
体層全体がゲル分率85％以上の高架橋度層から形成され
ていても何らさしつかえない。また、この高架橋度層
は、必ずしも層全体が均一なゲル分率である必要はな
く、層全体に亘って少なくともゲル分率85％以上とされ
ていればよい。このような高架橋度層を設けることによ
って、絶縁体層の内部および外部半導電層との界面から
の水トリーの発生、進展を防止することができ、耐水ト
リー性を向上させることができる。なお、これは、高架
橋度層によって、内部および外部半導電層中の導電性カ
ーボンによる内部または外部半導電層から絶縁体層への
イオン性不純物の混入が有効に防止されるからと考えら
れる。In the present invention, the highly crosslinked layer having a gel fraction of 85% or more is 0.5 mm from the interface with the internal or external semiconductive layer.
It is desirable to have the above thickness, and therefore, it does not matter if the entire insulating layer is formed of a highly crosslinked layer having a gel fraction of 85% or more. Further, this highly crosslinked layer does not necessarily need to have a uniform gel fraction over the entire layer, and may have a gel fraction of at least 85% over the entire layer. By providing such a highly cross-linked layer, it is possible to prevent the generation and development of a water tree from the inside of the insulator layer and the interface with the outer semiconductive layer, and improve the water tree resistance. It is considered that this is because the highly crosslinked layer effectively prevents the conductive carbon in the inner and outer semiconductive layers from mixing ionic impurities into the insulator layer from the inner or outer semiconductive layer.
【０００９】なお、高架橋度層のゲル分率が85％未満で
は、内部または外部半導電層から絶縁体層へのイオン性
不純物の混入を防止することができず、耐水トリー性を
十分に向上させることができない。When the gel fraction of the highly crosslinked layer is less than 85%, it is impossible to prevent the ionic impurities from being mixed into the insulator layer from the inner or outer semiconductive layer, and the water tree resistance is sufficiently improved. I can't let you do it.
【００１０】[0010]
【作用】本発明の耐水トリー性ケーブルでは、絶縁体層
の内部および外部半導電層との界面およびその近傍のゲ
ル分率85％以上の高架橋度層によって、内部および外部
半導電層からの絶縁体層へのイオン性不純物の混入が防
止され、これによって、水トリー発生および進展が抑え
られる結果、耐水トリー性が大幅に向上する。In the water resistant tree cable of the present invention, insulation from the inner and outer semiconductive layers is achieved by the highly crosslinked layer having a gel fraction of 85% or more at the interface with the inner and outer semiconductive layers of the insulator layer and in the vicinity thereof. The ionic impurities are prevented from being mixed into the body layer, which suppresses the generation and development of water trees, resulting in a significant improvement in water tree resistance.
【００１１】[0011]
【実施例】次に、図面に示す本発明の実施例について説
明する。Embodiments of the present invention shown in the drawings will be described below.
【００１２】実施例１ 図１に示すように、断面積 150mm2 の銅撚線導体１上
に、ポリエチレンに37重量％の導電性カーボン、および
5重量％の架橋剤ジクミルパーオキサイド（ＤＣＰ）を
配合した半導電性ポリエチレン組成物、ポリエチレンに
1.6重量％のＤＣＰを配合した絶縁性ポリエチレン組成
物、ポリエチレンに37重量％の導電性カーボン、および
5重量％のＤＣＰを配合した半導電性ポリエチレン組成
物を、三層同時押出しにより被覆し、常法により加熱架
橋させて、 1mm厚の内部半導電層２、 6mm厚の架橋ポリ
エチレンからなる絶縁体層３、 0.5mm厚の外部半導電層
４を形成した。次いで、外部半導電層４上に、軟質塩化
ビニル樹脂を押出被覆して 3mm厚の外被５を形成した。
絶縁体層３をほぼ均一な厚さに 5分割して各層３ａ〜３
eにおけるゲル分率を測定したところ、最内層３ａが87
％、外側に向けて順に85％、83％、84％、そして、最外
層３ｅが86％であった。EXAMPLE 1 As shown in FIG. 1, 37% by weight of conductive carbon was added to polyethylene on a stranded copper wire conductor 1 having a cross-sectional area of 150 mm 2.
Semi-conductive polyethylene composition containing 5% by weight of the cross-linking agent dicumyl peroxide (DCP), polyethylene
Insulating polyethylene composition containing 1.6 wt% DCP, 37 wt% conductive carbon in polyethylene, and
Insulator consisting of 1 mm thick inner semi-conductive layer 2 and 6 mm thick cross-linked polyethylene, coated with a semi-conductive polyethylene composition containing 5% by weight of DCP by three-layer coextrusion and heat-crosslinked by a conventional method. Layer 3, an outer semiconductive layer 4 having a thickness of 0.5 mm was formed. Then, a soft vinyl chloride resin was extrusion-coated on the outer semiconductive layer 4 to form a jacket 5 having a thickness of 3 mm.
The insulator layer 3 is divided into five parts each having a substantially uniform thickness, and each of the layers 3a to 3 is formed.
When the gel fraction at e was measured, it was found that the innermost layer 3a was 87
%, 85%, 83%, 84% toward the outside, and 86% of the outermost layer 3e.
【００１３】得られたケーブルの外被５を部分的に除去
して水槽中に浸漬し、 1か月間、13kV、1kHzの条件で浸
水課電して、水トリーの発生の有無を調べたが、内導ト
リー、外導トリー、ボウタイ状トリーのいずれも観察さ
れなかった。また、浸水課電後の絶縁破壊電圧は 385kV
であった。The jacket 5 of the obtained cable was partially removed and immersed in a water tank, and the presence of a water tree was examined by applying a flooded voltage under the conditions of 13 kV and 1 kHz for one month. Neither inward tree, outer tree, nor bow-tie tree was observed. The dielectric breakdown voltage after flooding is 385kV.
Met.
【００１４】実施例２ 図２に示すように、断面積 150mm2 の銅撚線導体６上
に、ポリエチレンに37重量％の導電性カーボンを配合し
た半導電性ポリエチレン組成物を押出被覆して 1mm厚の
内部半導電層７を形成し、その上に、ポリエチレンに
3.0重量％のＤＣＰを配合した絶縁性ポリエチレン組成
物、ポリエチレンに 1.6重量％のＤＣＰを配合した絶縁
性ポリエチレン組成物、ポリエチレンに 3.0重量％のＤ
ＣＰを配合した絶縁性ポリエチレン組成物を三層同時押
出しにより被覆し、常法により加熱架橋させて各層の厚
さがそれぞれ順に 1mm、 4mm、 1mmの三層からなる絶縁
体層８ａ、８ｂ、８ｃを形成し、さらに、その上に、ポ
リエチレンに37重量％の導電性カーボンを配合した半導
電性ポリエチレン組成物を押出被覆して 1mm厚の外部半
導電層９を形成した。次いで、この外部半導電層９上
に、軟質塩化ビニル樹脂を押出被覆して 3mm厚の外被１
０を形成した。絶縁体層各層８ａ、８ｂ、８ｃのゲル分
率は、それぞれ88％、83％、88％であった。EXAMPLE 2 As shown in FIG. 2, a semi-conductive polyethylene composition prepared by mixing 37% by weight of polyethylene with conductive carbon was extrusion-coated on a copper stranded wire conductor 6 having a cross-sectional area of 150 mm 2 to obtain a thickness of 1 mm. Form a thick inner semi-conducting layer 7 on top of which polyethylene
Insulating polyethylene composition containing 3.0% by weight of DCP, insulating polyethylene composition containing 1.6% by weight of DCP in polyethylene, and 3.0% by weight of D in polyethylene
An insulating polyethylene composition containing CP is coated by three-layer coextrusion, and heat-crosslinked by a conventional method to form insulating layers 8a, 8b, and 8c, each of which has a thickness of 1 mm, 4 mm, and 1 mm, respectively. Was further formed, and a semiconductive polyethylene composition obtained by mixing 37% by weight of conductive carbon with polyethylene was extrusion-coated thereon to form an external semiconductive layer 9 having a thickness of 1 mm. Then, a soft vinyl chloride resin is extrusion-coated on the outer semiconductive layer 9 to form a jacket 1 having a thickness of 3 mm.
Formed 0. The gel fractions of the insulating layers 8a, 8b and 8c were 88%, 83% and 88%, respectively.
【００１５】得られたケーブルの外被１０を部分的に除
去して水槽中に浸漬し、 1か月間、13kV、1kHzの条件で
浸水課電して、水トリーの発生の有無を調べたが、内導
トリー、外導トリー、ボウタイ状トリーのいずれも観察
されなかった。また、浸水課電後の絶縁破壊電圧は 355
kVであった。The jacket 10 of the obtained cable was partially removed and immersed in a water tank, and the presence of a water tree was examined by applying a flooded voltage under the conditions of 13 kV and 1 kHz for one month. Neither inward tree, outer tree, nor bow-tie tree was observed. The breakdown voltage after flooding is 355
It was kV.
【００１６】なお、比較のために、内部および外部半導
電層２、４形成用の半導電性ポリエチレン組成物を、Ｄ
ＣＰ未配合とした点を除いて、上記実施例１と同様に製
造した従来のケーブルについて、同様の特性評価試験を
行ったところ、水トリーは、150μｍ長の内導トリー 1
個、60μｍ長の内導トリー 2個、40μｍ長の外導トリー
1個が観察され、また、浸水課電後の絶縁破壊電圧は、
285kVであった。なお、このケーブルの絶縁体層を実施
例と同様にほぼ均一な厚さに 5分割して測定したゲル分
率は、内側より78％、80％、83％、80％、79％であっ
た。For comparison, a semiconductive polyethylene composition for forming the inner and outer semiconductive layers 2 and 4 was used as D
A similar characteristic evaluation test was conducted on a conventional cable manufactured in the same manner as in Example 1 except that CP was not compounded. As a result, the water tree was a 150 μm long inner conductive tree.
, 60 μm long inner conducting tree, 40 μm long outer conducting tree
One piece was observed, and the breakdown voltage after flooding was
It was 285 kV. In addition, the gel fraction measured by dividing the insulating layer of this cable into five parts with substantially uniform thickness as in the example was 78%, 80%, 83%, 80%, 79% from the inside. .
【００１７】[0017]
【発明の効果】以上の実施例からも明らかなように、本
発明の耐水トリーケーブルによれば、絶縁体層の内部お
よび外部半導電層との界面に、ゲル分率85％以上の高架
橋度層を有するようにしたので、水トリーの発生および
進展が防止され、耐水トリー性を向上させることができ
る。As is apparent from the above examples, according to the water resistant tree cable of the present invention, a high degree of crosslinking having a gel fraction of 85% or more is formed at the interface between the inner and outer semiconductive layers of the insulator layer. Since the layer is provided, the generation and development of the water tree can be prevented, and the water tree resistance can be improved.
【図１】本発明の一実施例の耐水トリー性ケーブルを示
す横断面図。FIG. 1 is a cross-sectional view showing a water resistant tree cable according to an embodiment of the present invention.
【図２】本発明の他の実施例の耐水トリー性ケーブルを
示す横断面図。FIG. 2 is a cross-sectional view showing a water resistant tree cable according to another embodiment of the present invention.
１、６………銅撚線導体 ２、７………内部半導電層 ３、８………絶縁体層 ３ａ、３ｂ、３ｅ、８ａ、８ｃ………ゲル分率85％以上
の高架橋度絶縁体層 ４、９………外部半導電層 ５、１０………外被1, 6 ... Copper stranded wire conductor 2, 7 ... Inner semiconductive layer 3, 8 ... Insulator layer 3a, 3b, 3e, 8a, 8c ..... High degree of crosslinking with gel fraction of 85% or more Insulator layer 4, 9 ... External semiconductive layer 5, 10 ...
Claims (1)
部半導電層、および外被を順に形成してなるケーブルに
おいて、前記絶縁体層の前記内部および外部半導電層と
の界面およびその近傍が、ゲル分率85％以上の高架橋度
層であることを特徴とする耐水トリー性ケーブル。1. A cable comprising an inner semiconductive layer, an insulator layer, an outer semiconductive layer, and an outer cover, which are sequentially formed on a conductor, wherein an interface of the insulator layer with the inner and outer semiconductive layers is provided. A water resistant tree cable characterized in that and its vicinity is a highly crosslinked layer having a gel fraction of 85% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4173377A JPH0620530A (en) | 1992-06-30 | 1992-06-30 | Water tree resistant cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4173377A JPH0620530A (en) | 1992-06-30 | 1992-06-30 | Water tree resistant cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0620530A true JPH0620530A (en) | 1994-01-28 |
Family
ID=15959269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4173377A Withdrawn JPH0620530A (en) | 1992-06-30 | 1992-06-30 | Water tree resistant cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0620530A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900692A (en) * | 1989-04-24 | 1990-02-13 | Motorola, Inc. | Method of forming an oxide liner and active area mask for selective epitaxial growth in an isolation trench |
| CN103854759A (en) * | 2012-11-30 | 2014-06-11 | 倪鹏程 | Waterproof cable |
| CN105788745A (en) * | 2016-04-12 | 2016-07-20 | 安徽天康(集团)股份有限公司 | Waterproof and anti-cold power cable |
| CN114792577A (en) * | 2021-09-24 | 2022-07-26 | 特变电工山东鲁能泰山电缆有限公司 | Insulation system and high voltage direct current cable |
-
1992
- 1992-06-30 JP JP4173377A patent/JPH0620530A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4900692A (en) * | 1989-04-24 | 1990-02-13 | Motorola, Inc. | Method of forming an oxide liner and active area mask for selective epitaxial growth in an isolation trench |
| CN103854759A (en) * | 2012-11-30 | 2014-06-11 | 倪鹏程 | Waterproof cable |
| CN105788745A (en) * | 2016-04-12 | 2016-07-20 | 安徽天康(集团)股份有限公司 | Waterproof and anti-cold power cable |
| CN114792577A (en) * | 2021-09-24 | 2022-07-26 | 特变电工山东鲁能泰山电缆有限公司 | Insulation system and high voltage direct current cable |
| CN114792577B (en) * | 2021-09-24 | 2023-05-30 | 特变电工山东鲁能泰山电缆有限公司 | Insulation structure and high-voltage direct-current cable |
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