JP3146450B2 - Lightning resistant optical fiber composite overhead ground wire - Google Patents
Lightning resistant optical fiber composite overhead ground wireInfo
- Publication number
- JP3146450B2 JP3146450B2 JP28604893A JP28604893A JP3146450B2 JP 3146450 B2 JP3146450 B2 JP 3146450B2 JP 28604893 A JP28604893 A JP 28604893A JP 28604893 A JP28604893 A JP 28604893A JP 3146450 B2 JP3146450 B2 JP 3146450B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- cross
- ground wire
- overhead ground
- wire
- 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
Links
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
- G02B6/4417—High voltage aspects, e.g. in cladding
-
- 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)
- Suspension Of Electric Lines Or Cables (AREA)
- Non-Insulated Conductors (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、耐雷型の光ファイバ
複合架空地線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightning-resistant optical fiber composite overhead ground wire.
【０００２】[0002]
【従来の技術】鋼芯の周囲をアルミ被覆層で覆ってなる
架空地線用のアルミ覆鋼線は、融点の高い鋼芯部分の断
面積比が大きいと、雷撃時に溶断しにくいので、耐雷性
能が良好となる。しかし、架空地線の外径を一定にした
場合、鋼芯部分の断面積比が大きいと導電率が小さくな
り、送電線本線からの誘導電流や雷撃電流が流れた際に
大きな発熱が生じ、特に、光ファイバ複合架空地線の場
合には内蔵する光ファイバユニットの温度上昇が著しく
なって光ファイバが熱的損傷を受けるおそれが生じる。
そのため、光ファイバ複合架空地線においては、導電率
が少なくとも２０％以上のアルミ覆鋼線を使用してい
る。なお、アルミ覆鋼線の導電率が２０％以上であると
いうことは、鋼芯部分の断面積のアルミ覆鋼線全体の断
面積に対する断面積比が７５％以下であることに相当す
る。2. Description of the Related Art An aluminum-coated steel wire for an aerial ground wire in which a steel core is covered with an aluminum coating layer has a high cross-sectional area ratio of a steel core portion having a high melting point, so that it is difficult to be blown during a lightning strike. Performance is good. However, when the outer diameter of the overhead ground wire is constant, the conductivity decreases when the cross-sectional area ratio of the steel core part is large, and a large amount of heat is generated when induced current or lightning current from the main line of the transmission line flows, In particular, in the case of an optical fiber composite ground wire, the temperature of the built-in optical fiber unit rises remarkably, and the optical fiber may be thermally damaged.
Therefore, in the optical fiber composite overhead ground wire, an aluminum covered steel wire having a conductivity of at least 20% or more is used. The fact that the conductivity of the aluminum-coated steel wire is 20% or more corresponds to a cross-sectional area ratio of the cross-sectional area of the steel core portion to the entire aluminum-coated steel wire of 75% or less.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の導電率が２
０％以上のアルミ覆鋼線は、送電線本線からの誘導電流
や雷撃電流が流れた際にも大きく発熱することがないた
め、光ファイバの熱的損傷のおそれを防止することがで
きる一方、鋼芯部分の断面積のアルミ覆鋼線全体の断面
積に対する断面積比が７５％以下と小さくなるため、素
線の機械的引っ張り強さにそれほどの余裕がないととも
に、雷撃時のアークにより素線が容易に溶断し易く、耐
雷信頼性に劣るものであった。The above-mentioned conventional conductivity is 2
The aluminum-coated steel wire of 0% or more does not generate a large amount of heat even when an induced current or a lightning current flows from the main line of the transmission line, thereby preventing the possibility of thermal damage to the optical fiber. Since the cross-sectional area ratio of the steel core portion to the cross-sectional area of the entire aluminum-coated steel wire is as small as 75% or less, there is not much room for the mechanical tensile strength of the wire, and the element is not affected by the arc during a lightning strike. The wire was easily blown and the lightning resistance was poor.
【０００４】本発明は上記事情に鑑みてなされたもの
で、耐雷性能が良好であることと、内蔵する光ファイバ
を熱損傷させないこととを同時に満足させることができ
る新規な光ファイバ複合架空地線を提供することを目的
とする。[0004] The present invention has been made in view of the above circumstances, and a novel optical fiber composite overhead ground wire capable of simultaneously satisfying good lightning resistance performance and preventing the built-in optical fiber from being thermally damaged. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】請求項１の発明は、光フ
ァイバユニットを内蔵するとともに鋼芯の周囲をアルミ
被覆層で覆ってなる丸形断面素線の複数本により最外層
撚線を形成してなる耐雷型の光ファイバ複合架空地線で
あって、前記鋼芯部分の断面積をＡ、丸形断面素線の断
面積をＢとしたとき、 Ａ／Ｂ≧０．８ であるとともに、前記複数本の丸形断面素線からなる最
外層撚線の外周にアルミロッドをスパイラル状に巻き付
けたことを特徴とする。According to the first aspect of the present invention, an outermost layer stranded wire is formed by a plurality of round cross-section strands including an optical fiber unit and a steel core covered with an aluminum coating layer. A / B ≧ 0.8, where A is the cross-sectional area of the steel core portion and B is the cross-sectional area of the round cross-section element wire. An aluminum rod is spirally wound around the outer periphery of the outermost stranded wire composed of the plurality of round cross-section element wires.
【０００６】請求項２の発明は、請求項１の光ファイバ
複合架空地線において、アルミロッドの断面積をＣとし
たとき、光ファイバユニット部分を除く架空地線部全体
に関して、 ΣＡ／（ΣＢ＋ΣＣ）≦０．７５ となるように前記アルミロッドの断面積Ｃを設定したこ
とを特徴とする。但し、ΣＡは光ファイバユニットを除
いた架空地線部全体における鋼芯部分の断面積の和 ΣＢは光ファイバユニットを除いた架空地線部全体につ
いての丸形断面素線の断面積の和 ΣＣは光ファイバユニットを除いた架空地線部全体にお
けるアルミロッドの断面積の和According to a second aspect of the present invention, in the optical fiber composite overhead ground wire of the first aspect, assuming that the cross-sectional area of the aluminum rod is C, the entire overhead ground wire portion excluding the optical fiber unit portion is expressed as: ΣA / (ΣB + ΣC ) ≦ 0.75, wherein the sectional area C of the aluminum rod is set. However, ΣA is the sum of the cross-sectional areas of the steel core portion in the entire overhead ground wire excluding the optical fiber unit. ΣB is the sum of the cross-sectional areas of the round cross-section element wires in the entire overhead ground wire excluding the optical fiber unit. Is the sum of the cross-sectional areas of the aluminum rods in the entire overhead ground wire excluding the optical fiber unit.
【０００７】[0007]
【作用】上記構成において、鋼芯の断面積比が大きいの
で、素線の機械的引っ張り強度は高く、また雷撃時のア
ークによる溶断もしにくく耐雷特性が良好となる。そし
て、鋼芯部分の断面積比が大きいことによる導電率の低
下に対しては、アルミロッドがその不足を補い、必要な
導電率を確保することとなる。In the above configuration, since the cross-sectional area ratio of the steel core is large, the mechanical tensile strength of the strand is high, and it is difficult to be blown by an arc during a lightning strike, and the lightning resistance is improved. And, with respect to a decrease in conductivity due to a large cross-sectional area ratio of the steel core portion, the aluminum rod compensates for the shortage, and secures necessary conductivity.
【０００８】また、アルミロッドが溶損代になるので、
最外層撚線のダメージが少なくなる。[0008] Also, since the aluminum rod becomes the erosion allowance,
The damage of the outermost stranded wire is reduced.
【０００９】[0009]
【実施例】以下、本発明の実施例を図１〜図２を参照し
て説明する。図１は請求項１の光ファイバ複合架空地線
の一実施例を示す。この光ファイバ複合架空地線１１
は、アルミ等のパイプ２内に光ファイバ３を収容してな
る光ファ イバユニット４の外周に複数本の丸形断面素線
１５を撚り合わせ、この撚線の外周に図２にも示すよう
に、アルミロッド１６をスパイラル状に巻き付けた構造
である。符号１５ａは丸形断面素線１５の鋼芯部分、符
号１５ｂはアルミ被覆層を示す。この丸形断面素線１５
は、前記鋼芯１５ａ部分の断面積をＡ、丸形断面素線１
５の断面積をＢとしたとき、 Ａ／Ｂ≧０．８ としている。すなわち、鋼芯１５ａ部分の断面積Ａの丸
形断面素線１５の断面積Ｂに対する断面積比Ａ／Ｂを８
０％以上としている。なお、断面積比が８０％であると
き、丸形断面素線１５の導電率は１８％である。また、
アルミロッド１６の断面積Ｃは、鋼芯１５ａ部分の断面
積Ａの丸形断面素線１５とアルミロッド１６とを合わせ
た断面積（Ｂ＋Ｃ）に対する断面積比Ａ／（Ｂ＋Ｃ）が
７５％以下になるように設定している。すなわち、実施
例では、１本のアルミロッド１６を有するので、 ΣＡ／（ΣＢ＋Ｃ）≦０．７５ である。なお、断面積比が７５％とは、光ファイバ複合
架空地線１１における光ファイバユニット４を除いた部
分、すなわち丸形断面素線１５とアルミロッド１６とか
らなる架空地線部全体の導電率が２０％以上であること
に相当する。なお、前記アルミロッド１６の巻き付け方
向は、これが丸形断面素線１５からなる撚線の撚り溝に
落ち込むのを防ぐために、図２に示すように丸形断面素
線１５の撚り方向と逆向きにするのがよい。また、アル
ミロッド１６は１本に限らず、複数本でもよい。EXAMPLES Hereinafter, an embodiment of the present invention with reference to FIGS. 1-2. FIG. 1 shows an optical fiber composite overhead ground wire according to an embodiment of the present invention. This optical fiber composite overhead ground wire 11
Is to house the optical fiber 3 in a pipe 2 made of aluminum or the like.
That the outer circumference of the optical fiber unit 4 twisting a plurality of round cross-section wire 15, as shown in FIG. 2 the outer periphery of the stranded wire, a structure wound aluminum rod 16 in a spiral shape. Reference numeral 15a denotes a steel core portion of the round wire 15 and reference numeral 15b denotes an aluminum coating layer. This round cross-section element wire 15
Indicates that the cross-sectional area of the steel core 15a is A,
When the cross-sectional area of No. 5 is B, A / B ≧ 0.8. That is, the sectional area ratio A / B of the sectional area A of the steel core 15a to the sectional area B of the round sectional element wire 15 is 8
0% or more. When the cross-sectional area ratio is 80%, the conductivity of the round cross-section element wire 15 is 18%. Also,
The cross-sectional area C of the aluminum rod 16 is such that the cross-sectional area ratio A / (B + C) of the cross-sectional area A of the steel core 15a to the cross-sectional area (B + C) of the round rod 15 and the aluminum rod 16 is 75% or less. It is set to become. That is, in the embodiment, since one aluminum rod 16 is provided, ΣA / (ΣB + C) ≦ 0.75. The cross-sectional area ratio of 75% refers to the electrical conductivity of the portion of the optical fiber composite overhead ground wire 11 excluding the optical fiber unit 4, that is, the electrical conductivity of the entire overhead ground wire portion including the round cross-section element wire 15 and the aluminum rod 16. Is equal to or greater than 20%. Incidentally, the winding direction of the aluminum rod 16, this is to prevent the falling into twisted grooves twisted consisting round cross-section wire 15, lay direction opposite to the direction of the round cross-section wires 15 as shown in FIG. 2 It is better to The number of the aluminum rods 16 is not limited to one, but may be a plurality.
【００１０】上記の光ファイバ複合架空地線１１におい
て、鋼芯１５ａ部分の断面積Ａの丸形断面素線１５の断
面積Ｂに対する断面積比Ａ／Ｂが大きいので、素線１５
はその機械的引っ張り強さが増し、また雷撃時のアーク
による溶断もしにくくなり、耐雷特性が向上する。ま
た、鋼芯１５ａ部分の断面積比Ａ／Ｂが大きいことによ
る導電率の低下に対しては、アルミロッド１６がその不
足を補い、送電線本線からの誘導電流や雷撃電流が流れ
た時の光ファイバ３の熱的損傷を防止するに必要な導電
率２０％を確保することとなる。In the above optical fiber composite overhead ground wire 11 , since the cross-sectional area ratio A / B of the cross-sectional area A of the steel core 15a to the cross-sectional area B of the round cross-sectional strand 15 is large, the strand 15
Has an increased mechanical tensile strength, is less likely to be blown by an arc during a lightning strike, and has improved lightning resistance. In addition, the aluminum rod 16 compensates for the decrease in conductivity due to the large cross-sectional area ratio A / B of the steel core 15a, and when the induction current or the lightning current from the main line of the transmission line flows, the aluminum rod 16 compensates for the shortage. The conductivity of 20% required to prevent the optical fiber 3 from being thermally damaged is secured.
【００１１】さらに、アルミロッド１６が雷撃時の溶損
代になるので、丸形断面素線１５部分のダメージが少な
くなり、したがって、最外層撚線の受けるダメージを極
力軽減することができる。Further, since the aluminum rod 16 serves as a melting allowance at the time of a lightning strike, damage to the portion of the round cross-section element wire 15 is reduced, so that damage to the outermost stranded wire can be reduced as much as possible.
【００１２】なお、鋼芯１５ａの丸形断面素線１５に対
する断面積比Ａ／Ｂは、上述のように８０％以上であれ
ばよいが、例えばこれが８７％の場合には、複数本の丸
形断面素線１５の撚り合わせ体である架空地線としての
導電率が１４％となり、送電線本線からの誘導電流や雷
撃電流が流れた時の光ファイバ３の熱的損傷を防止する
に必要な導電率２０％に対し、導電率が６％分不足する
ことになるが、この不足分はアルミロッド１６の断面積
Ｃで補われる。The cross-sectional area ratio A / B of the steel core 15a to the round cross-section element wire 15 may be 80% or more as described above. For example, when the ratio is 87%, a plurality of rounds are used.
Conductivity as an overhead ground wire, which is a twisted body of the cross-section element wire 15 , becomes 14%, and is necessary to prevent thermal damage to the optical fiber 3 when an induced current or a lightning current flows from the main line of the transmission line. The electrical conductivity is insufficient by 6% with respect to the specific electrical conductivity of 20%, but this insufficient amount is supplemented by the cross-sectional area C of the aluminum rod 16.
【００１３】実施例の光ファイバ複合架空地線１１は、
光ファイバユニット４の外周に一層の撚線を持つ構造で
あるが、複数層の撚線を持つものにも当然適用可能であ
る。複数層の撚線を持つ場合は、少なくともその最外層
の撚線について、上述した構成を適用する。The optical fiber composite overhead ground wire 11 of the embodiment is
Although the optical fiber unit 4 has a structure in which one layer of stranded wire is provided on the outer periphery, it is naturally applicable to a structure having a plurality of layers of stranded wire. When a plurality of layers of stranded wires are provided, the above-described configuration is applied to at least the outermost stranded wire.
【００１４】[0014]
【発明の効果】本発明によれば、鋼芯の周囲をアルミ被
覆層で覆ってなる丸形の断面を持つ素線において、鋼芯
部分の断面積比を大きくしたので、素線は機械的引っ張
り強度が向上し、また雷撃時のアークによる溶断もしに
くいものとなり、その耐雷特性が向上するものとなっ
た。そして、鋼芯部分の断面積比が大きいことによる導
電率の低下に対しては、アルミロッドでその不足を補う
ことにより、送電線本線からの誘導電流や雷撃電流が流
れた際の光ファイバの熱的損傷を防止するのに必要な導
電率を確保することができる。このように、耐雷性能の
向上と光ファイバを損傷させないこととを同時に満足さ
せることができるものとなった。According to the present invention, in a wire having a round cross-section in which the periphery of a steel core is covered with an aluminum coating layer, the cross-sectional area ratio of the steel core is increased, so that the wire is mechanically The tensile strength has been improved, and it has become difficult to be blown by an arc during a lightning strike, and its lightning resistance has been improved. To reduce the conductivity due to the large cross-sectional area ratio of the steel core, aluminum rods are used to make up for the shortage, so that the induced current or the lightning current from the main line of the transmission line can cause the optical fiber to fail. Conductivity required to prevent thermal damage can be secured. Thus, the improvement of the lightning resistance and the prevention of damage to the optical fiber can be satisfied at the same time.
【００１５】また、アルミロッドが溶損代になるので、
雷撃に伴う撚線自体のダメージを極力抑制することがで
きるものとなった。[0015] Also, since the aluminum rod becomes the erosion allowance,
The damage of the stranded wire itself due to the lightning strike can be suppressed as much as possible.
【図１】本発明の一実施例の耐雷型の光ファイバ複合架
空地線を示す横断面図である。FIG. 1 is a cross-sectional view showing a lightning-resistant optical fiber composite overhead ground wire according to an embodiment of the present invention.
【図２】図１の耐雷型の光ファイバ複合架空地線の側面
図である。FIG. 2 is a side view of the lightning-resistant optical fiber composite overhead ground wire of FIG. 1;
【符号の説明】１１ 光ファイバ複合架空地線 ２ パイプ ３ 光ファイバ ４ 光ファイバユニット １５ 丸形断面素線 １５ａ 鋼芯 １５ｂ アルミ被覆層 １６ アルミロッド[Description of Signs] 11 Optical fiber composite overhead ground wire 2 Pipe 3 Optical fiber 4 Optical fiber unit 15 Round cross section element wire 15a Steel core 15b Aluminum coating layer 16 Aluminum rod
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−47608（ＪＰ，Ａ) 特開 平５−234425（ＪＰ，Ａ) 実開 昭60−174125（ＪＰ，Ｕ) 実開 昭59−25914（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01B 5/08 - 5/10 G02B 6/44 381 H01B 11/22 H02G 7/00 H02G 7/22 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-47608 (JP, A) JP-A-5-234425 (JP, A) Fully open Showa 60-174125 (JP, U) Really open Showa 59- 25914 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) H01B 5/08-5/10 G02B 6/44 381 H01B 11/22 H02G 7/00 H02G 7/22
Claims (2)
ともに鋼芯（１５ａ）の周囲をアルミ被覆層（１５ｂ）
で覆ってなる丸形断面素線（１５）の複数本により最外
層撚線を形成してなる耐雷型の光ファイバ複合架空地線
であって、 前記鋼芯（１５ａ）部分の断面積をＡ、丸形断面素線
（１５）の断面積をＢとしたとき、 Ａ／Ｂ≧０．８ であるとともに、前記複数本の丸形断面素線（１５）か
らなる最外層撚線の外周にアルミロッド（１６）をスパ
イラル状に巻き付けてなることを特徴とする耐雷型の光
ファイバ複合架空地線。1. An optical fiber unit (4) is built in and a steel core (15a) is surrounded by an aluminum coating layer (15b).
A lightning-resistant optical fiber composite overhead ground wire formed by forming an outermost layer stranded wire with a plurality of round cross-section wires (15) covered with a wire, wherein the cross-sectional area of the steel core (15a) is A When the sectional area of the round cross-section wire (15) is B, A / B ≧ 0.8, and the outer circumference of the outermost layer stranded wire composed of the plurality of round cross-section wires (15) A lightning-resistant optical fiber composite overhead ground wire, wherein an aluminum rod (16) is spirally wound.
としたとき、光ファイバユニット（４）部分を除く架空
地線部全体に関して、 ΣＡ／（ΣＢ＋ΣＣ）≦０．７５ となるように前記アルミロッド（１６）の断面積Ｃを設
定してなる請求項１記載の耐雷型の光ファイバ複合架空
地線。但し、ΣＡは光ファイバユニット（４）を除いた
架空地線部全体における鋼芯（１５ａ）部分の断面積の
和 ΣＢは光ファイバユニット（４）を除いた架空地線部全
体についての丸形断面素線（１５）の断面積の和 ΣＣは光ファイバユニット（４）を除いた架空地線部全
体におけるアルミロッド（１６）の断面積の和2. The sectional area of the aluminum rod (16) is C
The sectional area C of the aluminum rod (16) is set so that ΣA / (ΣB + ΣC) ≦ 0.75 with respect to the entire overhead ground wire except for the optical fiber unit (4). 2. The lightning-resistant optical fiber composite overhead ground wire according to 1. Where ΣA is the sum of the cross-sectional areas of the steel core (15a) in the entire overhead ground wire excluding the optical fiber unit (4). ΣB is the round shape of the entire overhead ground wire excluding the optical fiber unit (4). Sum of the cross-sectional areas of the cross-section wires (15) ΔC is the sum of the cross-sectional areas of the aluminum rod (16) in the entire overhead ground wire excluding the optical fiber unit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28604893A JP3146450B2 (en) | 1993-10-20 | 1993-10-20 | Lightning resistant optical fiber composite overhead ground wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28604893A JP3146450B2 (en) | 1993-10-20 | 1993-10-20 | Lightning resistant optical fiber composite overhead ground wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07122116A JPH07122116A (en) | 1995-05-12 |
| JP3146450B2 true JP3146450B2 (en) | 2001-03-19 |
Family
ID=17699299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28604893A Expired - Fee Related JP3146450B2 (en) | 1993-10-20 | 1993-10-20 | Lightning resistant optical fiber composite overhead ground wire |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3146450B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5744755A (en) * | 1996-10-31 | 1998-04-28 | Marilyn A. Gasque | Lightning retardant cable |
| TW388031B (en) * | 1997-09-29 | 2000-04-21 | Furukawa Electric Co Ltd | Overhead wire |
| CN113470882B (en) * | 2021-07-06 | 2022-10-25 | 成都大唐线缆有限公司 | Photoelectric composite communication cable and manufacturing mold |
-
1993
- 1993-10-20 JP JP28604893A patent/JP3146450B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07122116A (en) | 1995-05-12 |
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