JP2001135147A - Overhead wire - Google Patents
Overhead wireInfo
- Publication number
- JP2001135147A JP2001135147A JP31669399A JP31669399A JP2001135147A JP 2001135147 A JP2001135147 A JP 2001135147A JP 31669399 A JP31669399 A JP 31669399A JP 31669399 A JP31669399 A JP 31669399A JP 2001135147 A JP2001135147 A JP 2001135147A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- main body
- overhead
- electric wire
- conductors
- 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
- Non-Insulated Conductors (AREA)
- Insulated Conductors (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、電柱間に架線され
て応力腐食割れの防止に有効な架空電線に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead electric wire which is wired between utility poles and is effective for preventing stress corrosion cracking.
【0002】[0002]
【従来の技術】一般に、電柱間に架線される架空電線1
は、たとえば図2に示すように、複数本の硬銅線による
導体2を撚り合わせた上から絶縁体3で被覆している。
しかし、このような架空絶縁電線1にあっては、製造時
の伸線工程や撚り線工程で導体2に残留応力が生じる。
残留応力の生じた導体2間に架線使用中に雨水などの水
成分が浸入すると、長期使用にわたって通電によって導
体2が温度上昇し、応力腐食割れを発生しやすいといっ
た問題がある。2. Description of the Related Art In general, an overhead electric wire 1 to be installed between telephone poles.
For example, as shown in FIG. 2, a conductor 2 made of a plurality of hard copper wires is twisted and covered with an insulator 3.
However, in such an overhead insulated wire 1, residual stress is generated in the conductor 2 in a wire drawing process or a stranded wire process during manufacturing.
If a water component such as rainwater enters between the conductors 2 where residual stress is generated during use of the overhead wire, there is a problem that the temperature of the conductor 2 increases due to energization over a long period of use, and stress corrosion cracking is likely to occur.
【0003】そうした応力腐食割れ問題を解決するため
に、図3に示すように、硬銅線による導体2間に充填混
和物4を充填することで、導体2間に雨水などが浸入す
るのを防止できるようにした架空電線1も周知である。In order to solve such a stress corrosion cracking problem, as shown in FIG. 3, by filling a filling mixture 4 between conductors 2 made of hard copper wire, it is possible to prevent rainwater or the like from entering between the conductors 2. An overhead electric wire 1 that can be prevented is also known.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、この図
2に示す従来の充填混和物4を導体2間に充填した架空
絶縁電線1にあっても、長期的には、充填混和物4が劣
化すると導体2との密着性が低下し、雨水などの浸入を
防止しきれなくなってしまう。結果、この場合も応力腐
食割れを十分に抑えることができない。また、そうした
充填混和物4を充填した分だけ電線重量が増大するため
に、導体2に働く引張応力が大きくなるといった逆効果
もある。However, even in the case of the overhead insulated wire 1 shown in FIG. 2 in which the filled mixture 4 is filled between the conductors 2 as shown in FIG. Adhesion with the conductor 2 is reduced, and it becomes impossible to prevent infiltration of rainwater or the like. As a result, also in this case, stress corrosion cracking cannot be sufficiently suppressed. Further, since the weight of the electric wire is increased by the amount of the filling mixture 4, there is an adverse effect that the tensile stress acting on the conductor 2 increases.
【0005】したがって、本発明の目的は、芯線導体と
してそれまでの硬銅線に代えて軟銅線を用いて撚り合わ
せたものを電線本体とし、これを支持線で吊った形にし
て架線使用中に電線本体に働く張力を負担することで、
応力腐食割れを有効に防止できるようにした自己支持型
の架空電線を提供することにある。Accordingly, an object of the present invention is to provide an electric wire body in which a core conductor is stranded by using a soft copper wire instead of a hard copper wire, and the wire body is hung by a support wire to form a core conductor. The tension acting on the wire body
An object of the present invention is to provide a self-supporting overhead electric wire capable of effectively preventing stress corrosion cracking.
【0006】[0006]
【課題を解決するための手段】本発明にかかる請求項1
に記載の架空電線は、軟銅素線による複数本の導体を撚
り合わせた表面を絶縁体によって被覆してなっている電
線本体部と、複数本の鋼線を撚り合わせた表面を前記絶
縁体によって一体成形して被覆して前記電線本体部に並
設された本体支持線部と、前記絶縁体によって一体成形
して前記電線本体部と前記本体支持線部とを一体に連結
する部分のつなぎ部と、からなっていることを特徴とす
る。Means for Solving the Problems Claim 1 according to the present invention.
The overhead electric wire according to the above, an electric wire body portion in which a surface obtained by twisting a plurality of conductors made of annealed copper wire is covered with an insulator, and a surface obtained by twisting a plurality of steel wires by the insulator. A main body support wire portion integrally formed and covered and arranged in parallel with the electric wire main body portion, and a connecting portion of a portion integrally formed with the insulator and integrally connecting the electric wire main body portion and the main body support wire portion And that it consists of.
【0007】以上の構成から、従来のように電線本体部
を形成する導体として「硬銅撚り線」を用いると、導体
の温度上昇と相まってその導体間に雨水などが浸入した
場合は応力腐食割れを発生しやすい環境にあった。それ
に対して、本発明のように導体に「軟銅撚り線」を用い
ると、従来の硬銅撚り線に比べて残留応力が極めて小さ
く、応力腐食割れの発生を抑えることができる。[0007] From the above configuration, when a "hard copper stranded wire" is used as the conductor forming the electric wire main body as in the prior art, stress corrosion cracking occurs when rainwater or the like enters between the conductors due to the rise in the temperature of the conductors. Environment. On the other hand, when the "soft copper stranded wire" is used for the conductor as in the present invention, the residual stress is extremely small as compared with the conventional hard copper stranded wire, and the occurrence of stress corrosion cracking can be suppressed.
【0008】しかし、軟銅撚り線を導体に用いて電線本
体部とした場合、硬銅撚り線による電線本体部と比べて
架線時に求められる張力は小さい。そうした電線本体部
の張力不足を「鋼線」の撚り線からなる本体支持線部で
補う。すなわち、電線本体部として要求される架線張力
つまり引張強さを本体支持線部でもって負担し、極端に
は電線本体部に架線張力がほとんどかからないようにす
る。したがって、電線本体部は架線張力を負担しないで
済むから、軟銅導体が硬化せずに引張応力を軽減でき
る。結果、架線中に雨水などが浸入した場合でも応力腐
食割れの発生を抑え、断線といった不都合を抑制して電
線を延命化させるので、自己支持型の架空電線に有効で
ある。[0008] However, when the wire body is formed by using a soft copper stranded wire as a conductor, the tension required at the time of the overhead wire is smaller than that of the wire body portion formed by the hard copper stranded wire. The lack of tension in the electric wire main body portion is compensated for by a main body support wire portion made of a stranded wire of “steel wire”. That is, the overhead wire tension, that is, the tensile strength, required for the electric wire main body portion is borne by the main body support wire portion, and extremely, the overhead wire tension is hardly applied to the electric wire main body portion. Therefore, the wire main body does not need to bear the overhead wire tension, so that the soft copper conductor does not harden and the tensile stress can be reduced. As a result, even if rainwater or the like infiltrates into the overhead line, the occurrence of stress corrosion cracking is suppressed, and the inconvenience such as disconnection is suppressed to extend the life of the electric wire, which is effective for a self-supporting overhead electric wire.
【0009】また、請求項2に記載の架空電線は、前記
本体支持線部を形成する前記鋼線が亜鉛メッキを施して
なっていることを特徴とする。The overhead electric wire according to claim 2 is characterized in that the steel wire forming the main body support wire portion is galvanized.
【0010】以上の構成から、裸線による鋼線を撚り合
わせるよりも、亜鉛メッキを施した鋼線を撚り合わせて
本体支持線部を形成することにより、防食性がなお一層
高められる。[0010] With the above structure, the corrosion resistance is further improved by twisting galvanized steel wires to form the main body supporting wire portion, rather than twisting bare steel wires.
【0011】[0011]
【発明の実施の形態】以下、本発明にかかる架空電線の
実施の形態について、図面に基づいて詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an overhead electric wire according to the present invention will be described below in detail with reference to the drawings.
【0012】図1は、本実施の形態による架空電線10
を示す断面図であり、電線本体部11と本体支持線部1
2が平行につながって、その本体支持線部12によって
架線中に求められる電線本体部11の所要の張力を補う
自己支持型となっている。FIG. 1 shows an overhead electric wire 10 according to the present embodiment.
FIG. 3 is a cross-sectional view showing the electric wire main body 11 and the main body support wire 1.
2 are connected in parallel, and are of a self-supporting type that compensates for the required tension of the electric wire main body 11 required in the overhead wire by the main body support wire 12.
【0013】そこで、電線本体部11は、芯線の導体1
3に軟銅線を用いてその複数本を撚り合わせ、撚り合わ
せた表面を絶縁体14で被覆して形成されている。絶縁
体14は、ここではたとえばポリエチレンまたは架橋ポ
リエチレンが使用されている。Therefore, the electric wire main body 11 is connected to the conductor 1 of the core wire.
3 is formed by twisting a plurality of wires using a soft copper wire and covering the twisted surface with an insulator 14. The insulator 14 is, for example, polyethylene or cross-linked polyethylene.
【0014】また、かかる電線本体部11に平行につな
がる本体支持線部12は、亜鉛メッキを施した複数本の
鋼線15を撚り合わせて表面を上記絶縁体14でもって
一体に被覆して形成されている。Further, the main body supporting wire portion 12 connected in parallel to the electric wire main body portion 11 is formed by twisting a plurality of galvanized steel wires 15 and integrally covering the surface with the insulator 14. Have been.
【0015】電線本体部11と本体支持線部12は、絶
縁体14と同質樹脂で一体成形されたつなぎ部16でも
って瓢箪形またはダルマ形状につながっている。The wire main body 11 and the main body support wire 12 are connected in a gourd or dalma shape by a connecting portion 16 integrally formed of the same resin as the insulator 14.
【0016】本実施の形態の架空電線10は以上のよう
に構成されている。電線本体部11を形成する芯線の導
体13に軟銅線を用いたことにより、伸線工程や撚り線
工程において発生する残留応力は極めて小さい。しか
し、軟銅線であるがゆえに電線本体部11として架線中
に求められる張力不足は否めない。そうした電線本体部
11の張力不足を本体支持線部12で負担する。この本
体支持線部12を形成する複数本の鋼線15としては、
より好ましくは各鋼線15の表面に亜鉛メッキを施して
防食性や防錆性を高め、電線本体部11に架線中の張力
がほとんど働かないようにするだけの引張強度が備わっ
ている。The overhead electric wire 10 of the present embodiment is configured as described above. By using a soft copper wire for the core conductor 13 forming the electric wire main body 11, residual stress generated in the wire drawing process or the stranded wire process is extremely small. However, since it is a soft copper wire, it is undeniable that there is insufficient tension required in the wire as the wire main body 11. Such insufficient tension of the wire main body 11 is borne by the main body support wire portion 12. As the plurality of steel wires 15 forming the main body support wire portion 12,
More preferably, the surface of each steel wire 15 is subjected to galvanization to enhance corrosion resistance and rust prevention, and the electric wire main body 11 is provided with a tensile strength enough to make almost no tension in the overhead wire work.
【0017】すなわち、本体支持線部12によって架線
中の張力のほとんどを負担される電線本体部11にあっ
ては、芯線の導体13として従来のように硬銅線を用い
ずとも軟銅線で十分に機能を果たすことができる。導体
13が軟銅線であるから、前述のように残留応力は小さ
く、架線中に硬化しない。そのため、架線中に雨水など
が導体13の撚り線間に浸入した場合でも、導体13の
温度上昇と相まって応力腐食割れの発生を抑止でき、電
線断線などといった事態を回避でき、耐久性を著しく高
めることが可能になる。That is, in the electric wire main body 11 in which most of the tension in the overhead wire is borne by the main body support wire 12, the soft copper wire is sufficient as the core conductor 13 without using a hard copper wire as in the conventional case. Function. Since the conductor 13 is a soft copper wire, the residual stress is small as described above and does not harden during the overhead wire. Therefore, even when rainwater or the like enters between the twisted wires of the conductor 13 in the overhead wire, it is possible to suppress the occurrence of stress corrosion cracking in combination with the temperature rise of the conductor 13, to avoid a situation such as a break in the electric wire, and to significantly increase the durability. It becomes possible.
【0018】[0018]
【発明の効果】以上説明したように、本発明にかかる請
求項1に記載の架空電線は、電線本体部を形成する導体
に軟銅撚り線を用いたことで、従来の硬銅撚り線に比べ
て残留応力が極めて小さく、応力腐食割れの発生を抑え
ることができる。軟銅撚り線を導体に用いて電線本体部
とした場合、硬銅撚り線による電線本体部と比べて架線
時に求められる張力は小さいが、そうした電線本体部の
張力不足を鋼線の撚り線からなる本体支持線部で補うこ
とができ、つまり電線本体部として要求される架線張力
つまり引張強さを本体支持線部でもって負担し、極端に
は電線本体部11に架線張力がほとんどかからないよう
にする。したがって、電線本体部は架線張力を負担しな
いで済むから、軟銅による導体は硬化せずに引張応力を
軽減できる。結果、架線中に雨水などが浸入した場合で
も応力腐食割れの発生を抑え、断線といった不都合を抑
制して電線を延命化させるので、自己支持型の架空電線
に有効である。As described above, the overhead electric wire according to the first aspect of the present invention uses a soft copper stranded wire as the conductor forming the electric wire main body, thereby making it possible to reduce the size of the conventional hard copper stranded wire. Thus, the residual stress is extremely small, and the occurrence of stress corrosion cracking can be suppressed. In the case of using a soft copper stranded wire as the conductor for the wire main body, the tension required at the time of the overhead wire is smaller than that of the wire body using the hard copper stranded wire, but such a lack of tension of the wire main body is due to the steel wire stranded wire It can be supplemented by the main body support wire, that is, the overhead wire tension required for the electric wire main body, that is, the tensile strength is borne by the main body support wire portion, and extremely, the overhead wire tension is hardly applied to the electric wire main body 11. . Therefore, since the electric wire main body does not have to bear the overhead wire tension, the tensile stress can be reduced without hardening the conductor made of soft copper. As a result, even when rainwater or the like infiltrates into the overhead line, the occurrence of stress corrosion cracking is suppressed, and the inconvenience such as disconnection is suppressed to extend the life of the electric wire, which is effective for a self-supporting overhead electric wire.
【0019】また、請求項2に記載の架空電線は、本体
支持線部を形成する鋼線に亜鉛メッキを施せば、裸線に
よる鋼線を撚り合わせるよりも防錆性や引張強度がなお
一層高められる。In the overhead electric wire according to the present invention, when the steel wire forming the main body support wire portion is galvanized, the rustproofness and the tensile strength are further improved as compared with the case of twisting a steel wire made of a bare wire. Enhanced.
【図1】本発明にかかる実施の形態として自己支持型の
架空電線を示す断面図である。FIG. 1 is a sectional view showing a self-supporting overhead electric wire as an embodiment according to the present invention.
【図2】従来例の架空電線を示す断面図である。FIG. 2 is a sectional view showing a conventional overhead electric wire.
【図3】別の従来例の架空電線を示す断面図である。FIG. 3 is a cross-sectional view illustrating another conventional overhead electric wire.
10 自己支持型架空電線 11 電線本体部 12 本体支持線部 13 導体 14 絶縁体 15 亜鉛メッキ鋼線 16 つなぎ部 DESCRIPTION OF SYMBOLS 10 Self-supporting overhead electric wire 11 Electric wire main body 12 Main body support wire 13 Conductor 14 Insulator 15 Galvanized steel wire 16 Connection
Claims (2)
せた表面を絶縁体によって被覆してなっている電線本体
部と、 複数本の鋼線を撚り合わせた表面を前記絶縁体によって
一体成形して被覆して前記電線本体部に並設された本体
支持線部と、 前記絶縁体によって一体成形して前記電線本体部と前記
本体支持線部とを一体に連結する部分のつなぎ部と、か
らなっていることを特徴とする架空電線。1. An electric wire body in which a surface obtained by twisting a plurality of conductors made of annealed copper wire is covered with an insulator, and a surface obtained by twisting a plurality of steel wires is integrally formed by the insulator. A main body supporting line portion which is covered and arranged in parallel with the electric wire main body portion, and a connecting portion of a portion which is integrally formed with the insulator and integrally connects the electric wire main body portion and the main body supporting line portion, An overhead electric wire, comprising:
亜鉛メッキを施してなっていることを特徴とする請求項
1に記載の架空電線。2. The overhead electric wire according to claim 1, wherein said steel wire forming said main body support wire portion is galvanized.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31669399A JP2001135147A (en) | 1999-11-08 | 1999-11-08 | Overhead wire |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31669399A JP2001135147A (en) | 1999-11-08 | 1999-11-08 | Overhead wire |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2001135147A true JP2001135147A (en) | 2001-05-18 |
Family
ID=18079859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31669399A Pending JP2001135147A (en) | 1999-11-08 | 1999-11-08 | Overhead wire |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2001135147A (en) |
-
1999
- 1999-11-08 JP JP31669399A patent/JP2001135147A/en active Pending
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