JP4460033B2 - Low voltage power line-optical unit composite cable - Google Patents

Low voltage power line-optical unit composite cable Download PDF

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Publication number
JP4460033B2
JP4460033B2 JP2000129339A JP2000129339A JP4460033B2 JP 4460033 B2 JP4460033 B2 JP 4460033B2 JP 2000129339 A JP2000129339 A JP 2000129339A JP 2000129339 A JP2000129339 A JP 2000129339A JP 4460033 B2 JP4460033 B2 JP 4460033B2
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JP
Japan
Prior art keywords
voltage power
low
optical unit
power line
cable
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 - Fee Related
Application number
JP2000129339A
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Japanese (ja)
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JP2001312926A (en
Inventor
徹也 安冨
一郎 小林
祐次 南谷
正仁 杉本
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THE FURUKAW ELECTRIC CO., LTD.
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THE FURUKAW ELECTRIC CO., LTD.
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Priority to JP2000129339A priority Critical patent/JP4460033B2/en
Publication of JP2001312926A publication Critical patent/JP2001312926A/en
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Description

【0001】
【発明の属する技術分野】
本発明は、住宅やビル等の屋内で使用される 600V以下の低圧電力ケーブルに、光ファイバユニットを複合した低圧電力線−光ユニット複合ケーブルに関するものである。
【0002】
【従来の技術】
従来、屋内配線に使用されている低圧電力ケーブルは図2のような構造である。すなわち、導体に塩化ビニル樹脂の絶縁被覆を施した低圧電力線10を3本、介在物12と共に同心円状に撚り合わせ、その外周に押え巻き14を施した上で、塩化ビニル樹脂のシース16を被せた構造である。
【0003】
一方、屋内に通信線として光ファイバを配線する場合には、図3に示すようなパイプケーブルが使用されている。このパイプケーブルは、中心テンションメンバー18のまわりに4本のポリエチレンパイプ20を集合し、その外周に押え巻き22を施し、さらにプラスチックシース24を施したものである。光ファイバは、1本又は複数本の光ファイバ心線に樹脂被覆を施した光ユニットの形態にして、図3のパイプケーブルを布設した後に、空気圧送工法によりポリエチレンパイプ20内に通線される。図3において、26はポリエチレンパイプ20内に通線された光ユニットである。
【0004】
【発明が解決しようとする課題】
上述のように従来の屋内配線では、低圧電力ケーブルと、光ユニット用のパイプケーブルとを別々に布設していたため、ケーブルコスト、布設コストがかさばるだけでなく、ケーブルが錯綜するため広い布設スペースが必要になるという問題があった。
【0005】
この問題を解決するには、図4のように、低圧電力線10とパイプ20を撚り合わせ、押え巻き14を施し、シース16を施した複合ケーブルを使用し、この複合ケーブルを布設した後に、空気圧送工法によりパイプ20内に光ユニットを通線することが考えられる。しかし図4のケーブル構造では、パイプ20が低圧電力線10と同じピッチで撚り合わされて、比較的短いピッチのらせん形になるため、光ユニットの通線抵抗が大きくなり、空気圧送工法でパイプ20内に光ユニットを通線することが困難になる。
【0006】
本発明の目的は、以上のような問題点に鑑み、ケーブルコスト、布設コストが安く、布設スペースが狭くて済むケーブルを提供することにある。
【0007】
【課題を解決するための手段】
本発明に係る低圧電力線−光ユニット複合ケーブルは、導体に熱可塑性樹脂の絶縁被覆を施してなる低圧電力線を複数本同心円状に撚り合わせると共に、隣り合う低圧電力線の間の谷部に、1本の光ファイバ心線又は複数本の光ファイバ心線の集合体に樹脂被覆を施してなる光ユニットを、前記低圧電力線と同じピッチで撚り合わせ、その外周に熱可塑性樹脂のシースを施してなり、前記低圧電力線及び光ユニットの撚りピッチが、同心円状に撚り合わされた低圧電力線の層心径の10倍以上、30倍以下であり、前記光ユニットの樹脂被覆が、ヤング率98N/mm 以上の熱可塑性樹脂で構成されている、ことを特徴とするものである。
このような複合ケーブルを使用すれば、ケーブルの布設本数を従来の半分にすることが可能となり、ケーブルコスト、布設コストを低減できると共に、布設スペースを縮小できる。
【0008】
この複合ケーブルにおいて、低圧電力線及び光ユニットの撚りピッチは、光ファイバの歪みを少なくし、ケーブル製造を容易にするために、同心円状に撚り合わされた低圧電力線の層心径の10倍以上にしてある。一方、ケーブルを小径に曲げた際に低圧電力線及び光ユニットの撚りが崩れるのを防止するため、低圧電力線及び光ユニットの撚りピッチを、低圧電力線の層心径の30倍以下としてある。
【0009】
また、光ユニットの被覆には、低圧電力線が通電により発熱した際に、あるいは布設環境によりケーブルが高温になった際に、光ユニットの被覆が軟化して光ユニットが変形することによる、光ファイバの伝送損失の増加を未然に防ぐため、ヤング率が98N/mm以上の熱可塑性樹脂を用いている
【0010】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して詳細に説明する。
図1は本発明の一実施形態を示す。図において、10は低圧電力線で、例えば直径0.6mm のJIS C 3102の電気用軟銅線7本からなる円形撚線を導体とし、これに塩化ビニル樹脂を0.8mm の厚さに被覆したものである。また26は光ユニットで、例えば外径0.25mmの紫外線硬化樹脂被覆光ファイバ心線を8心、外径0.4mm のテンションメンバを中心に集合し、その外周に熱可塑性樹脂の被覆を施したものである。
【0011】
図1の複合ケーブルは、上記のような低圧電力線10を3本、撚りピッチ100mm で同心円状に撚り合わせると共に、隣り合う低圧電力線10の間の谷部に、上記の光ユニット26及び紐状介在物12を、同じピッチで撚り合わせ、その外周に押え巻き14を施し、塩化ビニル樹脂のシース16を被せたものである。
この複合ケーブルについて、光ファイバケーブルに要求される、曲げ、側圧、衝撃、引張、捻回等の一般的な機械試験を行ったところ、問題のない特性であることが確認された。
【0012】
次に、図1のケーブル構造で、光ユニット26の被覆の材料だけが異なる3種類の複合ケーブルを試作し、各々の複合ケーブルを、胴径800mm のドラムに巻いた状態で、−30℃から70℃のヒートサイクル試験を行った結果を、表1に示す。
【0013】
【表1】

Figure 0004460033
【0014】
この結果によれば、より厳しい条件を考慮した場合、光ユニットの被覆には熱硬化性樹脂又はヤング率98N/mm2 以上の熱可塑性樹脂を使用することが好ましいことが分かる。
【0015】
以上は本発明の実施形態であり、本発明はこれに限定されるものではない。例えば低圧電力線は単線を導体としたものであってもよく、また低圧電力線の本数は3本以外でもよいし、光ユニットの本数は2本以上であってもよい。
【0016】
【発明の効果】
以上説明したように本発明によれば、低圧電力線と光ユニットを撚り合わせて複合ケーブルとしたので、この複合ケーブルを使用すれば、布設するケーブルの本数を従来の半分にすることができ、ケーブルコスト、布設コストを低減できると共に、布設スペースを縮小することができる。
【図面の簡単な説明】
【図1】 本発明に係る複合ケーブルの一実施形態を示す断面図。
【図2】 従来の低圧電力ケーブルを示す断面図。
【図3】 従来の光ユニット布設用のパイプケーブルを示す断面図。
【図4】 低圧電力線とパイプの複合ケーブルを示す断面図。
【符号の説明】
10:低圧電力線
12:介在物
14:押え巻き
16:シース
26:光ユニット[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low voltage power line-optical unit composite cable in which an optical fiber unit is combined with a low voltage power cable of 600 V or less used indoors such as a house or a building.
[0002]
[Prior art]
Conventionally, a low-voltage power cable used for indoor wiring has a structure as shown in FIG. That is, three low-voltage power lines 10 having a vinyl chloride resin insulation coating on the conductors are twisted concentrically with the inclusions 12, and a presser winding 14 is applied to the outer periphery thereof, and then a sheath 16 of vinyl chloride resin is covered. Structure.
[0003]
On the other hand, when an optical fiber is wired indoors as a communication line, a pipe cable as shown in FIG. 3 is used. In this pipe cable, four polyethylene pipes 20 are assembled around a center tension member 18, a presser winding 22 is provided on the outer periphery thereof, and a plastic sheath 24 is further provided. The optical fiber is formed in the form of an optical unit in which one or a plurality of optical fiber cores are coated with a resin, and after the pipe cable of FIG. 3 is installed, the optical fiber is passed through the polyethylene pipe 20 by a pneumatic feeding method. . In FIG. 3, reference numeral 26 denotes an optical unit that is passed through the polyethylene pipe 20.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional indoor wiring, the low voltage power cable and the pipe cable for the optical unit are separately laid, so that not only the cable cost and the laying cost are bulky, but also a large laying space because the cables are complicated. There was a problem that it was necessary.
[0005]
In order to solve this problem, as shown in FIG. 4, the low-voltage power line 10 and the pipe 20 are twisted together, the presser winding 14 is applied, and the composite cable with the sheath 16 is used. It is conceivable that the optical unit is routed in the pipe 20 by the feeding method. However, in the cable structure shown in FIG. 4, the pipe 20 is twisted at the same pitch as the low-voltage power line 10 to form a spiral with a relatively short pitch. It becomes difficult to pass the optical unit through.
[0006]
In view of the above problems, an object of the present invention is to provide a cable that is low in cable cost and laying cost and requires a small laying space.
[0007]
[Means for Solving the Problems]
The low-voltage power line-optical unit composite cable according to the present invention is formed by concentrically twisting a plurality of low-voltage power lines having a conductor covered with an insulating coating of thermoplastic resin, and one in a valley between adjacent low-voltage power lines. An optical unit formed by applying a resin coating to an optical fiber core wire or an assembly of a plurality of optical fiber core wires is twisted at the same pitch as the low-voltage power line, and a thermoplastic resin sheath is applied to the outer periphery thereof , The twisting pitch of the low-voltage power line and the optical unit is 10 to 30 times the core diameter of the low-voltage power line twisted concentrically, and the resin coating of the optical unit has a Young's modulus of 98 N / mm 2 or more. It is composed of a thermoplastic resin .
If such a composite cable is used, the number of cables installed can be halved compared to the conventional cable, and the cable cost and installation cost can be reduced, and the installation space can be reduced.
[0008]
In this composite cable, the twisting pitch of the low voltage power lines and the light unit, the distortion of the optical fiber was less, for ease of cable manufacture, and more than 10 times the layer center diameter concentrically twisted a low voltage power line is there. On the other hand, order to prevent the twisting of the low-voltage power line and an optical unit upon bending the cable in a small diameter is broken, the twisting pitch of the low-voltage power line and an optical unit, and the following 30 fold layers center diameter of low voltage power line .
[0009]
In addition, the optical unit is coated with an optical fiber by which the optical unit is softened and deformed when the low-voltage power line generates heat when energized or when the cable becomes hot due to the installation environment. to prevent the increase of transmission loss of the Young's modulus is used 98 N / mm 2 or more thermoplastic resin.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an embodiment of the present invention. In the figure, 10 is a low-voltage power line, for example, a conductor made of a circular twisted wire made of seven JIS C 3102 electrical copper wires of 0.6 mm in diameter and coated with vinyl chloride resin to a thickness of 0.8 mm. . Reference numeral 26 denotes an optical unit, for example, 8 cores of UV-curing resin-coated optical fibers having an outer diameter of 0.25 mm, gathered around a tension member having an outer diameter of 0.4 mm, and the outer periphery thereof is coated with a thermoplastic resin. It is.
[0011]
The composite cable shown in FIG. 1 has three low-voltage power lines 10 as described above twisted concentrically with a twist pitch of 100 mm, and the optical unit 26 and string-like interposition in the valley between adjacent low-voltage power lines 10. An object 12 is twisted at the same pitch, a presser winding 14 is applied to the outer periphery thereof, and a sheath 16 of vinyl chloride resin is covered.
When this composite cable was subjected to general mechanical tests such as bending, lateral pressure, impact, tension, and twist required for the optical fiber cable, it was confirmed that the composite cable had no problem.
[0012]
Next, with the cable structure of FIG. 1, three types of composite cables differing only in the coating material of the optical unit 26 were prototyped, and each composite cable was wound around a drum with a barrel diameter of 800 mm from -30 ° C. Table 1 shows the results of a heat cycle test at 70 ° C.
[0013]
[Table 1]
Figure 0004460033
[0014]
According to this result, it is understood that it is preferable to use a thermosetting resin or a thermoplastic resin having a Young's modulus of 98 N / mm 2 or more for covering the optical unit in consideration of stricter conditions.
[0015]
The above is an embodiment of the present invention, and the present invention is not limited to this. For example, the low-voltage power line may be a single line conductor, the number of low-voltage power lines may be other than three, and the number of optical units may be two or more.
[0016]
【The invention's effect】
As described above, according to the present invention, a low-voltage power line and an optical unit are twisted to form a composite cable. If this composite cable is used, the number of cables to be laid can be reduced to half that of the conventional cable. The cost and installation cost can be reduced, and the installation space can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a composite cable according to the present invention.
FIG. 2 is a cross-sectional view showing a conventional low-voltage power cable.
FIG. 3 is a cross-sectional view showing a conventional pipe cable for laying an optical unit.
FIG. 4 is a cross-sectional view showing a composite cable of a low voltage power line and a pipe.
[Explanation of symbols]
10: Low voltage power line
12: Inclusion
14: Presser winding
16: Sheath
26: Optical unit

Claims (1)

導体に熱可塑性樹脂の絶縁被覆を施してなる低圧電力線を複数本同心円状に撚り合わせると共に、隣り合う低圧電力線の間の谷部に、1本の光ファイバ心線又は複数本の光ファイバ心線の集合体に樹脂被覆を施してなる光ユニットを、前記低圧電力線と同じピッチで撚り合わせ、その外周に熱可塑性樹脂のシースを施してなり、
前記低圧電力線及び光ユニットの撚りピッチが、同心円状に撚り合わされた低圧電力線の層心径の10倍以上、30倍以下であり、
前記光ユニットの樹脂被覆が、ヤング率98N/mm 以上の熱可塑性樹脂で構成されている、
ことを特徴とする低圧電力線−光ユニット複合ケーブル。
A plurality of low-voltage power lines having a conductor coated with an insulating coating of thermoplastic resin are twisted concentrically, and one or more optical fiber cores are disposed in a valley between adjacent low-voltage power lines. The optical unit formed by applying a resin coating to the aggregate of the above is twisted at the same pitch as the low-voltage power line, and a thermoplastic resin sheath is applied to the outer periphery thereof ,
The twist pitch of the low-voltage power line and the optical unit is 10 times or more and 30 times or less of the core diameter of the low-voltage power line twisted concentrically,
The resin coating of the optical unit is made of a thermoplastic resin having a Young's modulus of 98 N / mm 2 or more.
A low-voltage power line-optical unit composite cable.
JP2000129339A 2000-04-28 2000-04-28 Low voltage power line-optical unit composite cable Expired - Fee Related JP4460033B2 (en)

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