JPH0118525B2 - - Google Patents
Info
- Publication number
- JPH0118525B2 JPH0118525B2 JP19799181A JP19799181A JPH0118525B2 JP H0118525 B2 JPH0118525 B2 JP H0118525B2 JP 19799181 A JP19799181 A JP 19799181A JP 19799181 A JP19799181 A JP 19799181A JP H0118525 B2 JPH0118525 B2 JP H0118525B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- modulus
- core material
- conductor
- young
- 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
- 239000013307 optical fiber Substances 0.000 claims description 33
- 239000002131 composite material Substances 0.000 claims description 14
- 239000004020 conductor Substances 0.000 claims description 13
- 239000011162 core material Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 229920000620 organic polymer Polymers 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4416—Heterogeneous cables
- G02B6/4422—Heterogeneous cables of the overhead type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Communication Cables (AREA)
Description
【発明の詳細な説明】
本発明はその構造内に光フアイバを収納した光
フアイバ複合架空線の構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a composite optical fiber overhead line containing optical fibers within the structure.
光フアイバ複合架空線は、その構成部材である
導電体に電流が流れた場合、特に短絡事故等によ
り大電流が流れた場合には、大きく温度上昇し、
ヒートサイクルを受ける。光フアイバ複合架空線
の熱膨張、熱収縮は、断面積の大きな、また強度
も強い導電体の材質（銅、アルミニウム、鉄な
ど）によりほとんど決まつてしまうが、導電体の
熱膨張率は光フアイバのそれよりほとんど１桁大
きい。したがつて、光フアイバと導電体の間に長
手方向の相対的な動き（ずれ）を生じ、光フアイ
バには不均一、局部的な応力が加わる。また熱膨
張率の差によつて、光フアイバは引張り、あるい
は圧縮応力を繰り返し受ける。 When a current flows through the conductor that constitutes the optical fiber composite overhead line, especially when a large current flows due to a short circuit, etc., the temperature rises significantly.
undergo heat cycling. Thermal expansion and contraction of optical fiber composite overhead lines are mostly determined by the material of the conductor (copper, aluminum, iron, etc.), which has a large cross-sectional area and strong strength, but the coefficient of thermal expansion of the conductor depends on the light almost an order of magnitude larger than that of fiber. Therefore, a relative movement (displacement) in the longitudinal direction occurs between the optical fiber and the conductor, and uneven and local stress is applied to the optical fiber. Furthermore, due to the difference in coefficient of thermal expansion, the optical fiber is repeatedly subjected to tensile or compressive stress.
これらの応力は光フアイバの伝送特性を損うば
かりでなく、破断の原因にもなる。これを避ける
ために、しばしばクツシヨン層を介して光フアイ
バを収納する構造がとられる。 These stresses not only impair the transmission characteristics of the optical fiber, but also cause it to break. To avoid this, a structure is often adopted in which the optical fiber is housed through a cushion layer.
クツシヨン層として、ガラス、ナイロン等の繊
維を束ねたものを用いた場合、半径方向の見かけ
上のヤング率は小さいが、長手方向のヤング率は
高く、ヒートサイクル試験において、これが独自
の挙動をし、光フアイバの局部的な曲げや、引張
りの原因となつた。 When a bundle of fibers such as glass or nylon is used as a cushion layer, the apparent Young's modulus in the radial direction is small, but the Young's modulus in the longitudinal direction is high, and this exhibits unique behavior in heat cycle tests. , causing local bending and tensioning of the optical fiber.
一方、クツシヨン層にポリエチレン等の充実ひ
もを用いると、半径方向の熱膨張により、高温で
光フアイバが押し拡げられ、引張り応力が増して
しまう。 On the other hand, if a solid string made of polyethylene or the like is used for the cushion layer, thermal expansion in the radial direction causes the optical fiber to be expanded at high temperatures, increasing tensile stress.
本発明の目的は、前記した従来構造の欠点を解
消し、伝送特性の安定した、しかも長期信頼性の
高い光フアイバ複合架空線を提供することにあ
る。 An object of the present invention is to eliminate the drawbacks of the conventional structure described above and to provide an optical fiber composite overhead line with stable transmission characteristics and high long-term reliability.
本発明の要旨は、光フアイバ複合架空線におけ
る内側の芯材と外側の導電体の熱膨張率を実質的
にほとんど等しくなるようにしたものであり、芯
材としてヤング率の大きなテンシヨンメンバーに
極めてヤング率の小さな物質を被覆したものを用
い、その上に光フアイバを巻きつけた光フアイバ
収納構造を用いた点にある。 The gist of the present invention is to make the coefficients of thermal expansion of the inner core material and the outer conductor substantially equal in an optical fiber composite overhead line, and to use a tension member with a large Young's modulus as the core material. The key point is that an optical fiber housing structure is used in which an optical fiber is wrapped around a material coated with a material having an extremely small Young's modulus.
芯材を構成するテンシヨンメンバの材質は、光
フアイバまでを含めた複合した熱膨張率（主にテ
ンシヨンメンバにより決定される）を導電体のそ
れと等しくするのであるが、一般には金属となろ
うが、場合によつては樹脂材料、ガラス繊維、芳
香族ポリアミド繊維等となることもあろう。 The material of the tension member that makes up the core material is made to have a composite coefficient of thermal expansion (mainly determined by the tension member) including that of the optical fiber, and is generally made of metal. The wax may be a resin material, glass fiber, aromatic polyamide fiber, etc. depending on the case.
要は、外側の導電体側の熱膨張率とほとんど等
しくするように、内側の芯材の材料、構造を決定
することである。 The key is to determine the material and structure of the inner core material so that the coefficient of thermal expansion is almost equal to that of the outer conductor.
テンシヨンメンバに被覆する低ヤング率物質
は、発泡シリコーンゴムのような、できるだけヤ
ング率の小さなものが良い。 The low Young's modulus material coated on the tension member is preferably one with a Young's modulus as small as possible, such as foamed silicone rubber.
本発明を図面を引用した実施例により、以下具
体的に説明する。 The present invention will be specifically described below with reference to the drawings.
この実施例は、光フアイバ複合架空地線の場合
である。 This example is for a fiber optic composite overhead ground wire.
テンシヨンメンバ１は外径0.3mmのステンレス
スチール線であり、その周上に低ヤング率物質層
２として耐熱性も考慮して、発泡シリコーンゴム
を外径２mmに被覆し、これらが芯材７を構成して
いる。 The tension member 1 is a stainless steel wire with an outer diameter of 0.3 mm, and a low Young's modulus material layer 2 on its circumference is coated with foamed silicone rubber with an outer diameter of 2 mm, taking heat resistance into consideration. It consists of
発泡シリコーンゴムのヤング率はほぼ２Kg／cm2
であり、これは例えばナイロンの約1/9000であり
極めて小さい。 The Young's modulus of foamed silicone rubber is approximately 2Kg/cm 2
This is, for example, about 1/9000 of nylon, which is extremely small.
芯材７の周上に光フアイバ３が長いピツチで巻
きつけてある。 The optical fiber 3 is wound around the core material 7 in a long pitch.
光フアイバ保護層４として、0.1mm厚さにガラ
ス繊維層が設けられており、その上に保護パイプ
５としてのアルミニウムパイプを介して、導電体
６としてのアルミニウム被覆鋼線が撚合されてい
る。このアルミニウム被覆鋼線は、外径３mmの鋼
線の周上に最終外径17.3mmとなるようにアルミニ
ウムを被覆した構造である。 A glass fiber layer with a thickness of 0.1 mm is provided as the optical fiber protective layer 4, and an aluminum-coated steel wire as the conductor 6 is twisted onto it via an aluminum pipe as the protective pipe 5. . This aluminum coated steel wire has a structure in which aluminum is coated on the circumference of a steel wire having an outer diameter of 3 mm so as to have a final outer diameter of 17.3 mm.
この実施例の複合架空地線の全体の熱膨張率
は、導電体６（アルミニウム被覆鋼線）のそれと
ほとんど等しく15×10-61／℃程度である。 The overall coefficient of thermal expansion of the composite overhead ground wire of this embodiment is approximately equal to that of the conductor 6 (aluminum coated steel wire), about 15×10 -6 1/°C.
そして、テンシヨンメンバ１としては、これと
ほとんど熱膨張率の等しい外径0.3mmのステンレ
ススチール線を用いたものである。 As the tension member 1, a stainless steel wire having an outer diameter of 0.3 mm and having almost the same coefficient of thermal expansion as the tension member 1 is used.
この実施例の複合架空地線においては、光フア
イバの長手方向ずれは起らず、また光フアイバに
加わる引張応力は従来のこの種複合架空地線に比
べて1/4〜1/10に減少した。ヒートサイクル試験
においても伝送特性は安定していた。 In the composite overhead ground wire of this example, no displacement occurs in the longitudinal direction of the optical fiber, and the tensile stress applied to the optical fiber is reduced to 1/4 to 1/10 compared to conventional composite overhead ground wires of this type. did. The transmission characteristics were also stable in heat cycle tests.
以上のような一実施例により説明した本発明の
光フアイバ複合架空地線は、次のような効果を発
揮する。 The optical fiber composite overhead ground wire of the present invention, which has been explained in accordance with the above-mentioned embodiment, exhibits the following effects.
(1) 芯材側と導電体側とが、ヒートサイクル時に
同じように伸縮をすることは、両者が相互に長
手方向のずれを生じないために重要であり、こ
れにより両者間に存在する光フアイバが局部的
に大きな張力を受けたりすることがなくなり、
ケーブル化したときの光フアイバの伝送特性及
び機械特性が非常に向上する。(1) It is important for the core material side and the conductor side to expand and contract in the same way during a heat cycle, in order to prevent mutual displacement in the longitudinal direction. is no longer subject to large local tension,
The transmission characteristics and mechanical properties of the optical fiber when made into a cable are greatly improved.
すなわち、光フアイバを巻き付ける芯材と導
電体側との熱膨張率を実質的にほとんど同じに
するために、両者は同じように伸縮し、長手方
向のずれは生じない。 That is, in order to make the coefficient of thermal expansion of the core material around which the optical fiber is wound and the conductor side substantially the same, both expand and contract in the same way, and no deviation occurs in the longitudinal direction.
また、芯材を構成するテンシヨンメンバのヤ
ング率も大きいので、長手方向にわたり均一に
伸縮し、局部的に伸縮量が集中する恐れがな
い。 Furthermore, since the Young's modulus of the tension member constituting the core material is large, it expands and contracts uniformly over the longitudinal direction, and there is no fear that the amount of expansion and contraction will be locally concentrated.
(2) テンシヨンメンバと光フアイバの間に低ヤン
グ率の物質を介在させることによる効果は次の
２点である。(2) Interposing a material with a low Young's modulus between the tension member and the optical fiber has the following two effects.
(i) この物質自体の熱膨張による悪影響が無視
できる。 (i) The adverse effects of thermal expansion of the material itself can be ignored.
即ち温度が高くなつても、膨張により光フ
アイバを押し拡げることがない。また、独自
で挙動することがなく、光フアイバの巻きつ
け形状を変化させない。 That is, even if the temperature becomes high, the optical fiber will not be forced to expand due to expansion. Furthermore, it does not behave independently and does not change the shape of the optical fiber wrapped around it.
(ii) 高温時、線路が熱膨張したときの、光フア
イバに加わる引張り応力を著しく低減させ
る。 (ii) Significantly reduces the tensile stress applied to the optical fiber when the line thermally expands at high temperatures.
図は本発明の一実施例を示す横断面図である。
１：テンシヨンメンバ、２：低ヤング率物質
層、３：光フアイバ、４：光フアイバ保護層、
５：保護パイプ、６：導電体、７：芯材。
The figure is a cross-sectional view showing one embodiment of the present invention. 1: Tension member, 2: Low Young's modulus material layer, 3: Optical fiber, 4: Optical fiber protective layer,
5: Protective pipe, 6: Conductor, 7: Core material.
Claims (1)
その周上に配置した導電体とから成り、芯材側と
導電体側の熱膨張率をほとんど等しくなるように
したことを特徴とする光フアイバ複合架空線。 ２ 芯材が、ヤング率の大きいテンシヨンメンバ
ーにヤング率の極めて小さい物質を被覆して構成
したものであることを特徴とする特許請求の範囲
第１項記載の光フアイバ複合架空線。 ３ ヤング率の極めて小さい物質が発泡有機重合
体であることを特徴とする特許請求の範囲第２項
記載の光フアイバ複合架空線。[Claims] 1. A core material, an optical fiber disposed around the core material,
What is claimed is: 1. An optical fiber composite overhead wire comprising a conductor disposed on the periphery thereof, the core material side and the conductor side having almost the same coefficient of thermal expansion. 2. The optical fiber composite overhead wire according to claim 1, wherein the core material is constructed by coating a tension member with a large Young's modulus with a material having an extremely small Young's modulus. 3. The optical fiber composite overhead wire according to claim 2, wherein the material having an extremely small Young's modulus is a foamed organic polymer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19799181A JPS58100103A (en) | 1981-12-09 | 1981-12-09 | Optical fiber composite aerial wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19799181A JPS58100103A (en) | 1981-12-09 | 1981-12-09 | Optical fiber composite aerial wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58100103A JPS58100103A (en) | 1983-06-14 |
| JPH0118525B2 true JPH0118525B2 (en) | 1989-04-06 |
Family
ID=16383687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19799181A Granted JPS58100103A (en) | 1981-12-09 | 1981-12-09 | Optical fiber composite aerial wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58100103A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6048620U (en) * | 1983-09-09 | 1985-04-05 | 昭和電線電纜株式会社 | Flexible fiber optic composite cable |
| US5115485A (en) * | 1987-05-04 | 1992-05-19 | Rochester Corporation | Cable for housing parallelly oriented optical fibers and method and apparatus for producing the same |
| CN106952686B (en) * | 2017-03-23 | 2019-06-14 | 中山市恒辉自动化科技有限公司 | A kind of composite overhead ground wire |
-
1981
- 1981-12-09 JP JP19799181A patent/JPS58100103A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58100103A (en) | 1983-06-14 |
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