JPS641883B2 - - Google Patents
Info
- Publication number
- JPS641883B2 JPS641883B2 JP6950280A JP6950280A JPS641883B2 JP S641883 B2 JPS641883 B2 JP S641883B2 JP 6950280 A JP6950280 A JP 6950280A JP 6950280 A JP6950280 A JP 6950280A JP S641883 B2 JPS641883 B2 JP S641883B2
- Authority
- JP
- Japan
- Prior art keywords
- conductive layer
- cable
- voltage
- vinyl acetate
- outer conductive
- 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
- 239000000203 mixture Substances 0.000 claims description 6
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 5
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 2
- 229920001038 ethylene copolymer Polymers 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 description 8
- 239000003973 paint Substances 0.000 description 4
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000004709 Chlorinated polyethylene Substances 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
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 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
- 239000003431 cross linking reagent Substances 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
Description
本発明は架橋ポリエチレン絶縁ケーブルに関す
るものである。
架橋ポリエチレン絶縁ケーブルの交流破壊電
圧、衝撃破壊電圧は優れたものであり近年
66KV、77KVクラスまで実用化されている。
しかし乍ら端末部、接続部作成のために外部導
電層をはぎとり、はぎとつたあと導電性塗料を塗
布して端末部を作成したあと直流電圧を印加する
と、外部導電層をはぎとつた部分の破壊電圧はケ
ーブル部、外部導電層の残つている部分に比べか
なり小さい。なお外部導電層として従来後述第１
表のＡ、Ｂ配合を用いていた。
将来直流送電用ケーブルとして用いる場合、又
は交流用ケーブルの場合も工場完了後に直流電圧
印加による竣工テストが行われる場合が多いこと
等を考慮すると、外部導電層を除去した部分の直
流破壊電圧を向上させることは重要である。
この点に鑑み本発明者は鋭意研究した結果、酢
酸ビニル（VA）量（エチレン−酢酸ビニル共重
合体に於てモノマー重量％）60％以上の酢酸ビニ
ル−エチレン共重合体（VAE）を主体とした導
電性組成物を外部導電層とすればこれらの問題点
を解決出来ることを見い出した。上記本発明は次
のような知見に基づくものである。
即ち前記の如く外部導電層をはぎとり端末部、
接続部を作り直流を印加すると外部導電層をとつ
た部分で破壊する（ケーブルの1/3以下の電圧）
のははぎとつた時に出来る絶縁表面の傷によるら
しいことを認識した。この傷を小さくするには剥
離力の小さい外部導電層をつくればよく、剥離力
はエチレンと酢酸ビニルの共重合体の酢酸ビニル
量に関係しそれが多いと剥離力が小さい。
以下に本発明を実施例について詳細に説明す
る。まず第１表に示す様にポリマー（EVA、
EVA−PVC共重合体、VAE、塩素化ポリエチレ
ン）とカーボンブラツク（アセチレンブラツク）
をバンバリーで混合したのちロールでパーオキサ
イド（２−５ジメチル２−５ジターシヤリブチル
ヘキシン３）を加えた。この後この混合物のペレ
ツトを作つた。
次に公称200mm2の銅撚線導体に0.8mm厚の内部導
電層（日本ユニカー社製HDFJ0580（EVAにカー
ボンを加え架橋剤が入つたコンパウンド））を押
出し、その上に12mm厚の絶縁層（日本ユニカー社
製HFD4201（ポリエチレンにDCP、老化防止剤を
混合したもの）を押出被覆し更にその上に第１表
の配合物を押出した後20Kg／cm2の高圧水蒸気チユ
ーブ中にケーブルを通し架橋せしめた。
出来上つたケーブルを第１図の様に外部導電層
５をはぎとりこの部分に第２表に示す導電性塗料
１を塗布して導電性架橋ポリエチレンテープ２を
まき、ストレスコーン３を差し込んで端末部を作
成した。なお４はケーブル絶縁層である。
次に導体に負極性電圧を140KV30分印加後
30KV／20分ステツプで昇圧させ破壊電圧を求め
た。この他同じ端末を作成後交流電圧200KV30
分印加後50KV／30分ステツプで昇圧し500KVま
で印加した。
用いたケーブルの外部導電層の配合、塗布した
導電性塗料、直流及び交流破壊電圧は第３表の通
りである。
第３表からわかる様に本発明に於ける配合を用
いたケーブルの交流破壊電圧は比較例のそれと同
じであるが、直流破壊電圧が高いことがわかる。
又本発明に於けるVAEのうちVA80％以上の
VAEをベースとした外部導電層の方がVA60％程
度のものよりすぐれている。なお本発明に於いて
第１表に示した配合剤以外の添加剤も必要に応じ
加えることが出来ることは言うまでもない。
The present invention relates to crosslinked polyethylene insulated cables. The AC breakdown voltage and impact breakdown voltage of cross-linked polyethylene insulated cables are excellent, and in recent years
It has been put into practical use up to 66KV and 77KV classes. However, if the outer conductive layer is peeled off to create a terminal part or a connection part, and a conductive paint is applied after the peeling to create the terminal part and then a DC voltage is applied, the breakdown voltage will be at the part where the outer conductive layer is peeled off. is considerably smaller than the cable section and the remaining portion of the outer conductive layer. Note that as an external conductive layer, the first
Mixtures A and B in the table were used. When using it as a DC power transmission cable in the future, or in the case of an AC cable, considering that a completion test is often conducted by applying a DC voltage after the factory is completed, the DC breakdown voltage of the part where the external conductive layer has been removed can be improved. It is important to In view of this, as a result of intensive research, the present inventor has found that a vinyl acetate-ethylene copolymer (VAE) with a vinyl acetate (VA) content (monomer weight % in the ethylene-vinyl acetate copolymer) of 60% or more is mainly used. It has been found that these problems can be solved by using the conductive composition as an outer conductive layer. The present invention is based on the following findings. That is, as described above, the outer conductive layer is peeled off and the terminal portion is removed.
If you make a connection and apply direct current, it will be destroyed at the part where the outer conductive layer is removed (voltage less than 1/3 of the cable)
I realized that this was probably due to scratches on the insulation surface that were created when it was torn off. In order to reduce these scratches, it is sufficient to create an outer conductive layer with a small peeling force, and the peeling force is related to the amount of vinyl acetate in the ethylene and vinyl acetate copolymer, and the more it is, the lower the peeling force is. The present invention will be described in detail below with reference to Examples. First, as shown in Table 1, polymers (EVA,
EVA-PVC copolymer, VAE, chlorinated polyethylene) and carbon black (acetylene black)
After mixing in a Banbury, peroxide (2-5 dimethyl 2-5 ditertiarybutylhexyne 3) was added using a roll. This mixture was then made into pellets. Next, we extruded a 0.8 mm thick internal conductive layer (HDFJ0580 manufactured by Nippon Unicar Co., Ltd. (a compound containing EVA with carbon and a crosslinking agent) onto a nominally 200 mm 2 copper stranded wire conductor, and on top of that we extruded a 12 mm thick insulating layer ( After extrusion coating HFD4201 (polyethylene mixed with DCP and anti-aging agent) manufactured by Nippon Unicar Co., Ltd. and extruding the compounds listed in Table 1 on top of that, the cable was passed through a 20 kg/cm 2 high-pressure steam tube and cross-linked. Strip off the outer conductive layer 5 of the completed cable as shown in Figure 1, apply conductive paint 1 shown in Table 2 to this part, wrap conductive cross-linked polyethylene tape 2, and insert stress cone 3. The terminal part was created using the following steps. 4 is the cable insulation layer. Next, after applying a negative polarity voltage of 140 KV to the conductor for 30 minutes,
The breakdown voltage was determined by increasing the voltage at 30KV/20 minutes. After creating the same terminal, AC voltage 200KV30
After applying the voltage for 30 minutes, the voltage was increased in steps of 50KV/30 minutes until 500KV was applied. Table 3 shows the composition of the outer conductive layer of the cable used, the applied conductive paint, and the DC and AC breakdown voltages. As can be seen from Table 3, the AC breakdown voltage of the cable using the formulation according to the present invention is the same as that of the comparative example, but the DC breakdown voltage is higher. Also, in the VAE of the present invention, VA of 80% or more
An external conductive layer based on VAE is superior to one with VAE of about 60%. It goes without saying that in the present invention, additives other than those shown in Table 1 can be added as necessary.
【表】【table】
【表】【table】
【表】【table】
第１図は本発明の効果を比較するため処理した
ケーブルの縦断面図である。
１……導電性塗料、２……導電性テープ、３…
…ストレスコーン、４……ケーブル絶縁層、５…
…ケーブル外部導電層。
FIG. 1 is a longitudinal sectional view of a cable treated to compare the effects of the present invention. 1... Conductive paint, 2... Conductive tape, 3...
...Stress cone, 4...Cable insulation layer, 5...
...cable outer conductive layer.
Claims (1)
共重合体を主体にした導電性組成物を外部導電層
としたことを特徴とする架橋ポリエチレン絶縁ケ
ーブル。1. A crosslinked polyethylene insulated cable characterized in that the outer conductive layer is made of a conductive composition mainly composed of a vinyl acetate-ethylene copolymer containing 60% or more of vinyl acetate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6950280A JPS56165212A (en) | 1980-05-24 | 1980-05-24 | Crosslinked polyethylene insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6950280A JPS56165212A (en) | 1980-05-24 | 1980-05-24 | Crosslinked polyethylene insulated cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56165212A JPS56165212A (en) | 1981-12-18 |
| JPS641883B2 true JPS641883B2 (en) | 1989-01-13 |
Family
ID=13404561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6950280A Granted JPS56165212A (en) | 1980-05-24 | 1980-05-24 | Crosslinked polyethylene insulated cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56165212A (en) |
-
1980
- 1980-05-24 JP JP6950280A patent/JPS56165212A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56165212A (en) | 1981-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS641883B2 (en) | ||
| JPH04106B2 (en) | ||
| EP0099640B1 (en) | Cross-linked polyethylene insulated cables | |
| JPS598216A (en) | Polyolefin insulated power cable with semiconducting layer | |
| JPH09231839A (en) | Direct current cable | |
| JPS59175506A (en) | Crosslinked polyethylene insulated high voltage cable | |
| JPH0234734Y2 (en) | ||
| JPH103823A (en) | DC cross-linked polyethylene insulated power cable | |
| JP3087284B2 (en) | Electrical insulation cable | |
| JP3777958B2 (en) | Cross-linked polyethylene insulated power cable suitable for recycling | |
| JPH0269543A (en) | Insulating composition and power cable | |
| JPS6123734B2 (en) | ||
| JPH01243305A (en) | Electrically insulated cable | |
| JP2774571B2 (en) | Electrical cable connection insulator | |
| JPH0680127B2 (en) | Semi-conductive resin composition | |
| JPS6245643B2 (en) | ||
| JP3158430B2 (en) | Electrical insulation cable | |
| JPS6356645B2 (en) | ||
| JPS61168806A (en) | Power cable | |
| JPH0515007B2 (en) | ||
| JPH0750107A (en) | Water-proof tree cable | |
| JPH0546163B2 (en) | ||
| JPH0241844B2 (en) | ||
| JPH10289619A (en) | DC power cable | |
| JPS5986109A (en) | Plastic power cable |