JPH062173Y2 - Power cable - Google Patents
Power cableInfo
- Publication number
- JPH062173Y2 JPH062173Y2 JP1986158108U JP15810886U JPH062173Y2 JP H062173 Y2 JPH062173 Y2 JP H062173Y2 JP 1986158108 U JP1986158108 U JP 1986158108U JP 15810886 U JP15810886 U JP 15810886U JP H062173 Y2 JPH062173 Y2 JP H062173Y2
- Authority
- JP
- Japan
- Prior art keywords
- power cable
- corrugated metal
- metal sheath
- anticorrosion layer
- hardness
- 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 - Lifetime
Links
Landscapes
- Insulated Conductors (AREA)
Description
【考案の詳細な説明】 〔技術分野〕 本考案は、波付き金属シースを有する電力ケーブルの捻
じり曲げ特性の改善に関するものである。Description: TECHNICAL FIELD The present invention relates to improvement of twisting and bending characteristics of a power cable having a corrugated metal sheath.
一般に高電圧で使用される電力ケーブルは、第１図に示
すように、導体１の外周に順次、内部導電層2、前記層
3、外部導電層4、金属遮蔽層5、押さえテープ6、波付き
金属シース7およびゴムまたはプラスチックよりなる防
食層8を設けた構造となっている。波付き金属シース7は
例えば厚さ0.8mm程度の機械的強度があるステンレス板
で形成されており、また防食層8は波付き金属シース7に
貼着されない状態で波付き金属シース7の外側に設けら
れている。Generally, a power cable used at a high voltage has an inner conductive layer 2 and the above-mentioned layers sequentially on the outer circumference of a conductor 1 as shown in FIG.
3, the outer conductive layer 4, the metal shielding layer 5, the pressing tape 6, the corrugated metal sheath 7 and the anticorrosion layer 8 made of rubber or plastic are provided. The corrugated metal sheath 7 is formed of, for example, a stainless steel plate having a mechanical strength of about 0.8 mm, and the anticorrosion layer 8 is provided outside the corrugated metal sheath 7 without being adhered to the corrugated metal sheath 7. It is provided.
ところで近年、このような電力ケーブルを数10ｍの高低
差のある立坑部に布設するケースが出てきている。この
ような所に電力ケーブルを布設する場合には、電力ケー
ブルを数10ｍ立上げてから曲げることになるため、電力
ケーブルに過大な捻じり曲げが加わることになる。その
結果、捻じり曲げによるストレスで、ケーブルコアを保
護すべき波付き金属シースが座屈してしまうという問題
のあることが明らかとなった。By the way, in recent years, there are cases in which such an electric power cable is installed in a vertical shaft portion having a height difference of several tens of meters. When the power cable is laid in such a place, the power cable is raised several tens of meters and then bent, so that the power cable is excessively twisted and bent. As a result, it became clear that there is a problem that the corrugated metal sheath, which should protect the cable core, buckles due to the stress caused by twisting and bending.
〔問題点の解決手段とその作用〕 本考案は上記のような従来技術の問題点を解決するた
め、機械的強度がある波付き金属シースの外側に該波付
き金属シースに貼着されない防食層を有する電力ケーブ
ルにおいて、上記防食層が、ＪＩＳ Ｋ6301「加硫ゴム
物理試験方法」に規定された硬さ試験による硬度（at20
℃）で、55〜65のゴムまたはプラスチックよりなること
を特徴とするものである。[Means for Solving Problems and Its Action] In order to solve the above-mentioned problems of the prior art, the present invention provides an anticorrosion layer which is not attached to the corrugated metal sheath outside the corrugated metal sheath having mechanical strength. In the power cable having the above, the anticorrosion layer has a hardness (at20 at the hardness test by a hardness test defined in JIS K6301 “Pulverized rubber physical test method”).
It is characterized by comprising 55 to 65 of rubber or plastic.
従来、防食層は波付き金属シースの防食のために設けら
れているので、防食層自体はそれほどの強度を有してい
なかった。本考案ではこの防食層にある程度の強度を持
たせて、波付き金属シースの座屈を防止しようとするも
のである。従来の防食層の硬度は、ＪＩＳ Ｋ6301に規
定された硬さ試験による硬度（at20℃）で45前後であっ
たが、これを55以上にすると捻じり曲げが加わっても波
付き金属シースの座屈が起きなくなることが実験により
判明した。なお布設時の捻じりの度合は、実規模実験に
よると、ケーブル１ｍあたり最大10°であり、曲げ径は
直径で波付き金属シースの平均外形Ｄの40倍である。Conventionally, since the anticorrosion layer is provided for the anticorrosion of the corrugated metal sheath, the anticorrosion layer itself does not have such strength. In the present invention, the anticorrosion layer is provided with a certain strength to prevent buckling of the corrugated metal sheath. The hardness of the conventional anticorrosion layer was around 45 at the hardness test (at 20 ° C) specified in JIS K6301, but if it is 55 or more, the seat of the corrugated metal sheath is added even if twisted and bent. Experiments have shown that buckling does not occur. According to an actual-scale experiment, the degree of twist during installation is 10 ° per 1 m of the cable, and the bending diameter is 40 times the average outer diameter D of the corrugated metal sheath.
波付き金属シースの座屈防止のためには防食層は硬い方
が好ましいのであるが、防食層が硬くなるとケーブルの
曲げ特性が低下してしまうので、防食層の硬度は65以下
にすることが好ましい。It is preferable that the anticorrosion layer is hard to prevent buckling of the corrugated metal sheath, but if the anticorrosion layer becomes hard, the bending characteristics of the cable will deteriorate, so the hardness of the anticorrosion layer should be 65 or less. preferable.
第１図のような構造の、275KV×2500mm2ＣＳＺＶ（架橋
ポリエチレン絶縁ステンレスシースケーブル）で、防食
層8の硬度の異なるものを試作し、捻じり曲げ試験を実
施した。ステンレスシース7は厚さ、0.8mm、波高5mm、
ピッチ25mm、外径140mmで、防食層8の厚さは6mmであ
る。結果は第１表のとおりであった。A 275 KV × 2500 mm 2 CSZV (cross-linked polyethylene insulated stainless sheath cable) having a structure as shown in FIG. 1 having different hardness of the anticorrosion layer 8 was manufactured as a prototype and a torsion bending test was conducted. Stainless steel sheath 7 is 0.8mm thick, wave height 5mm,
The pitch is 25 mm, the outer diameter is 140 mm, and the thickness of the anticorrosion layer 8 is 6 mm. The results are shown in Table 1.
〔考案の効果〕 以上説明したように本考案によれば、防食層の硬度を、
ＪＩＳ Ｋ6301に規定された硬さ試験による硬度（at20
℃）で、55〜65の範囲とすることにより、捻じり曲げが
加わっても波付き金属シースの座屈のない電力ケーブル
を得ることができる。 [Effect of the Invention] As described above, according to the present invention, the hardness of the anticorrosion layer is
Hardness by a hardness test specified in JIS K6301 (at20
By setting the temperature to be in the range of 55 to 65 in (° C.), it is possible to obtain a power cable without buckling of the corrugated metal sheath even when twisted and bent.
第１図は本考案の一実施例に係る電力ケーブルを示す断
面図である。 １〜導体、３〜絶縁層、５〜金属遮蔽層、７〜波付き金
属シース、８〜防食層。FIG. 1 is a sectional view showing a power cable according to an embodiment of the present invention. 1-conductor, 3-insulation layer, 5-metal shielding layer, 7-corrugated metal sheath, 8-corrosion preventive layer.
Claims (1)
に該波付き金属シースに貼着されない防食層を有する電
力ケーブルにおいて、上記防食層が、ＪＩＳ Ｋ6301に
規定された硬さ試験による硬度（at20℃）で55〜65のゴ
ムまたはプラスチックよりなることを特徴とする電力ケ
ーブル。1. A power cable having a corrugated metal sheath having mechanical strength and having an anticorrosion layer which is not adhered to the corrugated metal sheath, wherein the anticorrosion layer has a hardness according to a hardness test specified in JIS K6301. An electric power cable characterized by comprising 55 to 65 rubber or plastic (at 20 ° C).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986158108U JPH062173Y2 (en) | 1986-10-17 | 1986-10-17 | Power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986158108U JPH062173Y2 (en) | 1986-10-17 | 1986-10-17 | Power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6363911U JPS6363911U (en) | 1988-04-27 |
| JPH062173Y2 true JPH062173Y2 (en) | 1994-01-19 |
Family
ID=31081286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986158108U Expired - Lifetime JPH062173Y2 (en) | 1986-10-17 | 1986-10-17 | Power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062173Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5954109A (en) * | 1982-09-20 | 1984-03-28 | 昭和電線電纜株式会社 | Laminated sheath cable |
-
1986
- 1986-10-17 JP JP1986158108U patent/JPH062173Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6363911U (en) | 1988-04-27 |
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