JPH05242748A - Manufacture of power cable - Google Patents
Manufacture of power cableInfo
- Publication number
- JPH05242748A JPH05242748A JP7582392A JP7582392A JPH05242748A JP H05242748 A JPH05242748 A JP H05242748A JP 7582392 A JP7582392 A JP 7582392A JP 7582392 A JP7582392 A JP 7582392A JP H05242748 A JPH05242748 A JP H05242748A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- temperature
- insulator
- cooling
- pipe
- 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
Landscapes
- Processes Specially Adapted For Manufacturing Cables (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は電力ケーブルの製造方
法に係り、特に非架橋ポリエチレン絶縁電力ケーブルの
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a power cable, and more particularly to a method for manufacturing a non-crosslinked polyethylene insulated power cable.
【０００２】[0002]
【従来の技術】電力ケーブルとして絶縁材が絶縁耐力や
誘電特性に優れているポリエチレンを母材とした非架橋
低密度ポリエチレンケーブル（以下、ＬＤＰＥケーブル
と称す）、非架橋高密度ポリエチレンケーブル（以下、
ＨＤＰＥケーブルと称す）が従来汎用されている。2. Description of the Related Art As a power cable, a non-crosslinked low-density polyethylene cable (hereinafter referred to as LDPE cable) and a non-crosslinked high-density polyethylene cable (hereinafter referred to as LDPE cable) whose base material is polyethylene whose insulating material has excellent dielectric strength and dielectric properties.
An HDPE cable) has been widely used conventionally.
【０００３】これらの電力ケーブルの製造は、第２図，
第３図に示すように芯線導体１の外周上に押出機３によ
りダイス２を介してポリエチレン樹脂を押出し被覆し、
架橋ケーブルの場合はガス架橋ゾーン４において高温架
橋工程を経て、また、非架橋ケーブルの場合はガス冷却
ゾーン４´においてそのまま冷却過程に入り、冷水ゾー
ン５により冷却してポリエチレンを結晶化即ち固化させ
て製造している。通常は上記冷却ゾーン４´，５はケー
ブルを加圧した状態で冷却を行うようになっている。
（特願平３−３５２３３号参照）The manufacture of these power cables is described in FIG.
As shown in FIG. 3, polyethylene resin is extruded and coated on the outer periphery of the core conductor 1 by an extruder 3 through a die 2,
In the case of a cross-linked cable, a high-temperature cross-linking step is performed in the gas cross-linking zone 4, and in the case of a non-cross-linked cable, the cooling process is directly performed in the gas cooling zone 4 ', and cooled in the cold water zone 5 to crystallize or solidify polyethylene. Are manufactured. Normally, the cooling zones 4'and 5 are designed to cool the cables under pressure.
(See Japanese Patent Application No. 3-35233)
【０００４】[0004]
【発明が解決しようとする課題】ところで、このような
冷却過程においては、ケーブル絶縁体の外層は即座に冷
却が進んで結晶化が生じるが、芯線導体１に近いケーブ
ル絶縁体の内層はなかなか冷却が進まず、外層に比べか
なりの時間を経た後に結晶化が生じることになる。この
ように絶縁体外層が先に固化した状態ではガス冷却ゾー
ン４および水冷ゾーン５における加圧効果は薄らぎ、ま
だ溶融状態にある絶縁体内層に対しては圧力がかからな
いため、絶縁体の結晶化時に生じる比容積変化のために
絶縁体内層，外層に応力が働き、最悪の場合は絶縁体中
にクラックやボイドが発生してしまうことになる。ま
た、上記のクラックやボイドが発生しないまでもポリエ
チレンの非晶領域にミクロボイドや密度の疎の部分を発
生させてしまう。このようなクラック，ボイド，ミクロ
ボイドあるいは密度の疎の領域の存在は、ケーブル絶縁
体の絶縁性能を大きく低下させる要因になってしまう。By the way, in such a cooling process, the outer layer of the cable insulator is immediately cooled to be crystallized, but the inner layer of the cable insulator close to the core conductor 1 is hard to cool. Does not proceed, and crystallization occurs after a considerable time has passed compared to the outer layer. In such a state where the outer layer of the insulator is first solidified, the pressurizing effect in the gas cooling zone 4 and the water cooling zone 5 is weakened, and no pressure is exerted on the inner layer of the insulator which is still in a molten state. Due to the change in specific volume that occurs at times, stress acts on the inner and outer layers of the insulator, and in the worst case, cracks and voids will occur in the insulator. Further, even if the above-mentioned cracks and voids do not occur, microvoids and sparsely dense portions are generated in the amorphous region of polyethylene. The presence of such cracks, voids, microvoids, or areas of low density becomes a factor that significantly reduces the insulation performance of the cable insulator.
【０００５】この発明は、このような点に鑑みてなされ
たもので、上述した従来技術の欠点を解消し、絶縁性能
を大幅に増加させることのできる新規な電力ケーブルの
構造および電力ケーブルの製造方法を提供することを目
的とする。The present invention has been made in view of the above circumstances, and solves the above-mentioned drawbacks of the prior art and can significantly increase the insulation performance of a novel power cable structure and manufacture of the power cable. The purpose is to provide a method.
【０００６】[0006]
【課題を解決するための手段】この発明では、芯線導体
の外周部に非架橋ポリエチレンからなる絶縁材を被覆す
る電力ケーブルの製造方法において、芯線導体に光ファ
イバー温度レーダーを有する冷却用パイプを設け、ケー
ブル製造時に上記冷却用パイプに冷媒を流してケーブル
絶縁体を冷却固化させ、上記光ファイバー温度レーダー
により冷却制御を行うようにしたことを特徴とする電力
ケーブルの製造方法である。According to the present invention, in a method of manufacturing a power cable in which an outer peripheral portion of a core conductor is coated with an insulating material made of non-crosslinked polyethylene, a core pipe is provided with a cooling pipe having an optical fiber temperature radar, In the method of manufacturing a power cable, a cooling medium is caused to flow through the cooling pipe to cool and solidify the cable insulator at the time of manufacturing the cable, and cooling control is performed by the optical fiber temperature radar.
【０００７】[0007]
【作用】芯線導体に冷却用パイプを有する構造とし、さ
らに、その中に光ファイバー温度レーダーを配置した構
成にしたので、芯線導体からの絶縁体冷却を可能にし、
絶縁体内層からの冷却を行うことによりケーブル絶縁体
中にボイド，ミクロボイドなどの発生を抑えることによ
り、電力ケーブルの絶縁破壊性能を大幅に向上させるこ
とができる。[Function] Since the core conductor has a cooling pipe and the optical fiber temperature radar is arranged in the structure, the insulator can be cooled from the core conductor.
By suppressing the generation of voids, microvoids, etc. in the cable insulator by cooling from the inner layer of the insulator, the dielectric breakdown performance of the power cable can be greatly improved.
【０００８】[0008]
【実施例】以下、この発明の実施例として、ＨＤＰＥケ
ーブルの製造方法を例として説明する。第１図にこの発
明により製造された電力ケーブルの構成を示す横断面図
を示す。１１は撚り線導体から構成されるケーブル導体
で、この中央部には冷却用パイプ１５が設けられ、この
冷却用パイプ１５内には光ファイバー温度レーダー１６
が設置されている。そして、ケーブル導体１１の外周に
は内部半導電層１２，ケーブル絶縁体１３，外部半導電
層１４がそれぞれ被覆して構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing an HDPE cable will be described below as an embodiment of the present invention. FIG. 1 is a cross-sectional view showing the structure of a power cable manufactured according to the present invention. Reference numeral 11 is a cable conductor composed of a stranded wire conductor. A cooling pipe 15 is provided in the center of the cable conductor, and an optical fiber temperature radar 16 is provided in the cooling pipe 15.
Is installed. The outer circumference of the cable conductor 11 is covered with an inner semiconductive layer 12, a cable insulator 13, and an outer semiconductive layer 14, respectively.
【０００９】この電力ケーブルの押出し製造時に、第２
図のガス冷却ゾーン４´の下側からあるいは第３図の水
冷ゾーン５内に水を流し、ケーブル導体１側からも冷却
パイプ５に冷媒として水を流し冷却を行った。このと
き、第２図のガス冷却ゾーン４´はケーブル絶縁体の結
晶化温度（１２０℃）以上に保ち、ガス冷却ゾーン４´
において絶縁体３の外層が固化しないようにした。ま
た、第２図および第３図の水冷ゾーン５内の長さ方向の
温度は、光ファイバー温度レーダー１６で監視し、下か
ら順に押出機に至るまで常温から１００℃まで温度勾配
を持つように水の流速を調整した。このような水の流速
の調整により、電力ケーブルの絶縁体内の結晶化はゆっ
くりと内層から外層に向け進むことになる。During the extrusion manufacturing of this power cable, the second
Water was made to flow from below the gas cooling zone 4'in the figure or in the water cooling zone 5 in FIG. 3, and water was also made to flow from the cable conductor 1 side to the cooling pipe 5 as a refrigerant for cooling. At this time, the gas cooling zone 4'of FIG. 2 is kept above the crystallization temperature (120 ° C) of the cable insulator, and the gas cooling zone 4 '
In, the outer layer of the insulator 3 was prevented from solidifying. The temperature in the lengthwise direction in the water cooling zone 5 shown in FIGS. 2 and 3 is monitored by the optical fiber temperature radar 16 so that the temperature gradient from room temperature to 100 ° C. is maintained from the bottom to the extruder. Was adjusted. By adjusting the flow velocity of water in this manner, crystallization in the insulator of the power cable slowly proceeds from the inner layer to the outer layer.
【００１０】架橋ケーブルの場合は、冷媒を油として第
３図の架橋ゾーン４の押出機側において油温を１５０℃
〜２００℃となるように調整することにより電力ケーブ
ルの架橋効率を高めることも可能である。In the case of a crosslinked cable, the oil temperature is 150 ° C. on the extruder side of the crosslinked zone 4 in FIG. 3 using oil as the refrigerant.
It is also possible to increase the cross-linking efficiency of the power cable by adjusting the temperature to be ~ 200 ° C.
【００１１】表１に本実施例で得られたＨＤＰＥケーブ
ルの絶縁破壊性能を従来の方法で得られたＨＤＰＥケー
ブルと比較して示す。ＡＣおよびＤＣ破壊強度は大幅に
上昇した。また、絶縁体を顕微鏡で観察しボイドの大き
さを調べたところ、１０μｍ以上のボイドは全く検出さ
れなかった。さらに、透過型電子顕微鏡（ＴＥＭ）で結
晶状態を観察したところ、ミクロボイドの発生も極めて
少なかった。Table 1 shows the dielectric breakdown performance of the HDPE cable obtained in this example in comparison with the HDPE cable obtained by the conventional method. The AC and DC fracture strength increased significantly. Also, when the size of the void was examined by observing the insulator with a microscope, no void of 10 μm or more was detected. Furthermore, when the crystal state was observed with a transmission electron microscope (TEM), the generation of microvoids was extremely small.
【００１２】[0012]
【発明の効果】以上説明したとおり、この発明の電力ケ
ーブルの製造方法によれば、絶縁体のボイドの発生が極
めて少なく、これらに起因する電力ケーブル絶縁破壊電
圧の低下が解消され、これに伴って絶縁体の厚さを薄く
することが可能となり、電力ケーブルの小型化，軽量化
を図ることができる。さらに、冷却パイプ内の冷媒の温
度は押出機付近では１００℃付近に調整されるため、絶
縁体押出し被覆前のケーブル導体の予測としても活用で
きる。また、冷却パイプ内の光ファイバー温度レーダー
は、ケーブル布設後の運転時にケーブル温度の監視とし
て活用できることは言うまでもない。As described above, according to the method of manufacturing a power cable of the present invention, the generation of voids in the insulator is extremely small, and the decrease in the breakdown voltage of the power cable due to these is eliminated. As a result, the thickness of the insulator can be reduced, and the power cable can be reduced in size and weight. Furthermore, since the temperature of the refrigerant in the cooling pipe is adjusted to around 100 ° C. near the extruder, it can be utilized as a prediction of the cable conductor before extrusion coating of the insulator. Further, it goes without saying that the optical fiber temperature radar in the cooling pipe can be used as a cable temperature monitor during operation after the cable is laid.
【図１】この発明の製造方法によって製造される電力ケ
ーブルの構成を示す横断面図、FIG. 1 is a cross-sectional view showing a configuration of a power cable manufactured by a manufacturing method of the present invention,
【図２】従来の電力ケーブルの製造方法に使用される製
造機の概略構成図、FIG. 2 is a schematic configuration diagram of a manufacturing machine used in a conventional power cable manufacturing method,
【図３】先行攻技術のＸＬＰＬケーブルの製造方法に使
用される製造機の概略構成図である。FIG. 3 is a schematic configuration diagram of a manufacturing machine used in a manufacturing method of a prior art XLPL cable.
１ 芯線導体 ２ ダイス ３ 押出機 ４ ガス架橋ゾーン ４´ ガス冷却ゾーン ５ 水冷ゾーン １１ ケーブル導体 １２ 内部半導電層 １３ ケーブル絶縁体 １４ 外部半導電層 １５ 冷却用パイプ １６ 光ファイバー温度レーダー 1 core conductor 2 die 3 extruder 4 gas bridge zone 4'gas cooling zone 5 water cooling zone 11 cable conductor 12 inner semi-conductive layer 13 cable insulator 14 outer semi-conductive layer 15 cooling pipe 16 optical fiber temperature radar
【表１】 [Table 1]
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年１１月２４日[Submission date] November 24, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】全図[Correction target item name] All drawings
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図１】 [Figure 1]
【図２】 [Fig. 2]
【図３】 [Figure 3]
Claims (1)
からなる絶縁材を被覆する電力ケーブルの製造方法にお
いて、芯線導体に光ファイバー温度レーダーを有する冷
却用パイプを設け、ケーブル製造時に上記冷却用パイプ
に冷媒を流してケーブル絶縁体を冷却固化させ、上記光
ファイバ−温度レーダーにより冷却制御を行うようにし
たことを特徴とする電力ケーブルの製造方法。1. A method of manufacturing a power cable in which an insulating material made of non-crosslinked polyethylene is coated on an outer peripheral portion of a core conductor, wherein the core conductor is provided with a cooling pipe having an optical fiber temperature radar, and the cooling pipe is used at the time of manufacturing the cable. A method for producing an electric power cable, characterized in that a cooling medium is flowed to cool and solidify the cable insulator, and cooling control is performed by the optical fiber-temperature radar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7582392A JPH05242748A (en) | 1992-02-28 | 1992-02-28 | Manufacture of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7582392A JPH05242748A (en) | 1992-02-28 | 1992-02-28 | Manufacture of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05242748A true JPH05242748A (en) | 1993-09-21 |
Family
ID=13587299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7582392A Pending JPH05242748A (en) | 1992-02-28 | 1992-02-28 | Manufacture of power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05242748A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008243720A (en) * | 2007-03-28 | 2008-10-09 | Ube Nitto Kasei Co Ltd | Manufacturing method of hollow core for coaxial cable |
| JP4651260B2 (en) * | 2000-04-28 | 2011-03-16 | エービービー エービー | Stationary induction machine and cable therefor |
| JP2012119328A (en) * | 2012-02-01 | 2012-06-21 | Ube Nitto Kasei Co Ltd | Manufacturing apparatus for coaxial cable hollow core body |
| JP2012124172A (en) * | 2012-02-01 | 2012-06-28 | Ube Nitto Kasei Co Ltd | Molding die used for manufacturing hollow core body for coaxial cable |
-
1992
- 1992-02-28 JP JP7582392A patent/JPH05242748A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4651260B2 (en) * | 2000-04-28 | 2011-03-16 | エービービー エービー | Stationary induction machine and cable therefor |
| JP2008243720A (en) * | 2007-03-28 | 2008-10-09 | Ube Nitto Kasei Co Ltd | Manufacturing method of hollow core for coaxial cable |
| JP2012119328A (en) * | 2012-02-01 | 2012-06-21 | Ube Nitto Kasei Co Ltd | Manufacturing apparatus for coaxial cable hollow core body |
| JP2012124172A (en) * | 2012-02-01 | 2012-06-28 | Ube Nitto Kasei Co Ltd | Molding die used for manufacturing hollow core body for coaxial cable |
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