JPH0338899Y2 - - Google Patents
Info
- Publication number
- JPH0338899Y2 JPH0338899Y2 JP1985126404U JP12640485U JPH0338899Y2 JP H0338899 Y2 JPH0338899 Y2 JP H0338899Y2 JP 1985126404 U JP1985126404 U JP 1985126404U JP 12640485 U JP12640485 U JP 12640485U JP H0338899 Y2 JPH0338899 Y2 JP H0338899Y2
- Authority
- JP
- Japan
- Prior art keywords
- water
- water detection
- cable
- wires
- shielding layer
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000001514 detection method Methods 0.000 claims description 28
- 238000009413 insulation Methods 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 239000011295 pitch Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000006866 deterioration Effects 0.000 description 5
- 208000027418 Wounds and injury Diseases 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 240000005572 Syzygium cordatum Species 0.000 description 2
- 235000006650 Syzygium cordatum Nutrition 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Insulated Conductors (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、外部からの水の侵入を検知し得る水
検知線付電力ケーブルに関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power cable with a water detection line that can detect water intrusion from the outside.
電力ケーブルは外部からの水の侵入によつて絶
縁体に水トリー劣化を生じ易い。特に、シースが
外傷等を受けると絶縁体上にまで短時間で水が到
達するため劣化が促進される。また、外傷が無く
とも浸水があると長期的にはPVC、PEシース等
を通して水が拡散し、絶縁体中に水トリーが発生
し絶縁劣化を生ずる。このため、定期的に電力ケ
ーブルの絶縁測定を行つて劣化の進展状況を監視
する必要があるが、絶縁体上まで水が到達してい
ない段階では、劣化は生じていないので絶縁測定
を行う必要はない。従つて、常時絶縁体上に水が
存在するか否かを監視することができれば、それ
までは絶縁測定を行わなくても済むので合理的で
ある。
Power cables are susceptible to water tree deterioration in their insulation due to water intrusion from the outside. In particular, if the sheath is subjected to external damage or the like, water will reach the insulator in a short period of time, accelerating its deterioration. In addition, even if there is no external injury, if there is water intrusion, water will diffuse through the PVC, PE sheath, etc. over the long term, causing water trees to form in the insulator and causing insulation deterioration. For this reason, it is necessary to periodically measure the insulation of power cables to monitor the progress of deterioration. However, as long as water has not reached the top of the insulator, no deterioration has occurred and insulation measurements must be performed. There isn't. Therefore, if it is possible to constantly monitor whether or not water is present on the insulator, it is reasonable to eliminate the need to perform insulation measurements until then.
従来においても、複数条の帯状導体を並べた警
報線を予めケーブル内に配線しておき、浸水によ
る警報線間の導通により浸水を知る方法が知られ
ているが、電力ケーブルを構成する導電性部分の
一部分にでも接触することがあると、警報線とし
ての役割を果すことができなくなる。 Conventionally, a method is known in which a warning wire consisting of multiple strip-shaped conductors is wired in advance inside the cable, and water intrusion can be detected by detecting continuity between the warning wires due to water intrusion. If it comes into contact with even a portion of the wire, it will no longer be able to function as a warning wire.
本考案の目的は、上述の要望に応え、水の侵入
を容易にかつ確実に検知・監視し得る水検知線付
電力ケーブルを提供することにある。
An object of the present invention is to provide a power cable with a water detection wire that can easily and reliably detect and monitor water intrusion in response to the above-mentioned needs.
上述の目的を達成するための本考案の要旨は、
２本の水検知線をケーブル内の金属遮蔽層上に沿
つて互いに反対方向にスパイラル状に等ピツチで
巻き付けて配線し、これらの水検知線の絶縁被覆
は含水により絶縁抵抗が低下する材料としたこと
を特徴とする水検知線付電力ケーブルである。
The gist of this invention to achieve the above objectives is as follows:
Two water detection wires are wired by winding them spirally in opposite directions along the metal shielding layer inside the cable at equal pitches, and the insulation coating of these water detection wires is made of a material whose insulation resistance decreases due to water content. This is a power cable with a water detection wire.
本考案を図示の実施例に基づいて詳細に説明す
る。
The present invention will be explained in detail based on illustrated embodiments.
第１図はケーブルの断面図であり、中心部から
外側に順次に導体１、内部半導電層２、絶縁層
３、外部半導電層４、金属遮蔽層５、ケーブルシ
ース６が積層されている。本実施例においては、
例えば銅テープ巻き層或いはワイヤーシールドと
呼ばれる銅線スパイラル巻き層から成る金属遮蔽
層５と例えばポリ塩化ビニル或いはポリエチレン
から成るシース６間に、２本の水検知線７ａ，７
ｂがケーブルの長手方向に沿つて配置されてい
る。これらの水検知線７ａ，７ｂは第２図に示す
ように、互いに分離して反対方向に等ピツチでか
つスパイラル状に金属遮蔽層５上に巻き付けられ
ている。水検知線７ａ，７ｂとしては、例えば銅
線から成る芯線の外側に、含水によつて容易に絶
縁抵抗が低下する例えばEPゴム・ブチルゴム・
ポリエチレン及びポリ塩化ビニル等の絶縁材料に
酸化マグネシウム・炭酸カルシウム等の無機充填
剤を多量に混入た絶縁材料によつて被覆したもの
が使用されている。 Figure 1 is a cross-sectional view of the cable, in which a conductor 1, an inner semiconducting layer 2, an insulating layer 3, an outer semiconducting layer 4, a metal shielding layer 5, and a cable sheath 6 are laminated in order from the center outward. . In this example,
Two water detection wires 7a, 7 are connected between a metal shielding layer 5 made of, for example, a copper tape-wound layer or a copper wire spiral-wound layer called a wire shield, and a sheath 6 made of, for example, polyvinyl chloride or polyethylene.
b are arranged along the longitudinal direction of the cable. As shown in FIG. 2, these water detection wires 7a and 7b are separated from each other and wound in opposite directions at equal pitches and spirally on the metal shielding layer 5. The water detection wires 7a and 7b may be made of, for example, EP rubber, butyl rubber, etc., which easily lowers the insulation resistance due to water content, on the outside of the core wire made of copper wire.
Insulating materials such as polyethylene and polyvinyl chloride coated with an insulating material containing a large amount of inorganic fillers such as magnesium oxide and calcium carbonate are used.
これらの水検知線７ａ，７ｂは金属遮蔽層５上
に設けられているために静電誘導電圧が生ずるこ
とはなく、自己芯線を流れる導体電流による誘導
電圧が発生することはあつても、対地に対して全
く同一電圧であるために２線間に電位差は生ずる
ことはなく、他の芯線からの誘導電圧に対しても
同様に電位差はない。 Since these water detection lines 7a and 7b are provided on the metal shielding layer 5, no electrostatic induced voltage is generated, and even though induced voltage may be generated due to conductor current flowing through the self-core wire, There is no potential difference between the two wires because the voltage is exactly the same for the core wires, and there is no potential difference between the two wires as well.
金属遮蔽層５は一般にケーブルの片端或いは両
端で接地されているが、水検知線７ａ，７ｂは接
地せずに対地から浮かしており、この２本の水検
知線７ａ，７ｂの芯線間の絶縁抵抗を、測定或い
は抵抗の変化状態を監視すればよい。水が侵入す
れば水検知線７ａ，７ｂの被覆の絶縁抵抗は低下
し、検知線７ａ，７ｂ間の絶縁抵抗が金属遮蔽層
５を短絡して変化することになり、電力ケーブル
に水が侵入したか否かを検知することが可能とな
る。また、絶縁抵抗が或る値以下になると警報を
発生するようにしておけば、水の侵入を常時監視
することができる。 The metal shielding layer 5 is generally grounded at one or both ends of the cable, but the water detection wires 7a and 7b are not grounded but are floating above the ground, and the insulation between the core wires of these two water detection wires 7a and 7b is The resistance may be measured or the state of change in resistance may be monitored. If water enters, the insulation resistance of the coating of the water detection wires 7a and 7b will decrease, and the insulation resistance between the detection wires 7a and 7b will short-circuit the metal shielding layer 5 and change, causing water to enter the power cable. It becomes possible to detect whether or not it has been done. Furthermore, if an alarm is generated when the insulation resistance falls below a certain value, water intrusion can be constantly monitored.
この場合に、水検知線７ａ，７ｂ同志の交叉部
分はシース６の押圧力により押圧されており、こ
の部分に浸水すると水検知線７ａ，７ｂ同志は短
絡し浸水が迅速に検知できる。また、水検知線７
ａ，７ｂを互いに逆方向にスパイラル状に巻き付
けることによりケーブルの曲げ特性を均一化し、
更に水検知線７ａ，７ｂ自体も断線し難い状態で
内在させることができる。 In this case, the crossing portion of the water detection lines 7a, 7b is pressed by the pressing force of the sheath 6, and when this portion is flooded with water, the water detection lines 7a, 7b are short-circuited, allowing rapid detection of water intrusion. In addition, water detection line 7
By winding a and 7b in a spiral shape in opposite directions, the bending characteristics of the cable are made uniform,
Furthermore, the water detection lines 7a and 7b themselves can be placed inside in a state where they are difficult to break.
以上説明したように本考案に係る水検知線付電
力ケーブルは、含水による絶縁抵抗が低下する絶
縁被覆を持つ２本の水検知線を、ケーブルシース
と金属遮蔽層との間で金属遮蔽層の上に互いに分
離して反対方向にスパイラル状に布線しているた
めに、ケーブル内に水が侵入することにより水検
知線間の絶縁抵抗或いは各水検知線と金属遮蔽層
間の絶縁抵抗が低下し、直ちに水の侵入を発見す
ることが可能となる。
As explained above, in the power cable with water detection wire according to the present invention, two water detection wires having an insulation coating whose insulation resistance decreases due to water content are connected to a metal shielding layer between the cable sheath and the metal shielding layer. Since the cables are separated from each other and wired spirally in opposite directions, water intrusion into the cable reduces the insulation resistance between the water detection wires or between each water detection wire and the metal shielding layer. This makes it possible to immediately detect water intrusion.
図面は本考案に係る水検知線付電力ケーブルの
一実施例を示し、第１図は電力ケーブルの断面
図、第２図は水検知線の布線状態の斜視図であ
る。
符号１は導体、２は内部半導電層、３は絶縁
層、４は外部半導電層、５は金属遮蔽層、６はケ
ーブルシース、７ａ，７ｂは水検知線である。
The drawings show an embodiment of a power cable with a water detection wire according to the present invention, in which FIG. 1 is a sectional view of the power cable, and FIG. 2 is a perspective view of the water detection wire in a wiring state. 1 is a conductor, 2 is an inner semiconducting layer, 3 is an insulating layer, 4 is an outer semiconducting layer, 5 is a metal shielding layer, 6 is a cable sheath, and 7a and 7b are water detection wires.
Claims (1)
沿つて互いに反対方向にスパイラル状に等ピツチ
で巻き付けて配線し、これらの水検知線の絶縁被
覆は含水により絶縁抵抗が低下する材料としたこ
とを特徴とする水検知線付電力ケーブル。 Two water detection wires are wired by winding them spirally in opposite directions along the metal shielding layer inside the cable at equal pitches, and the insulation coating of these water detection wires is made of a material whose insulation resistance decreases due to water content. A power cable with a water detection line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985126404U JPH0338899Y2 (en) | 1985-08-19 | 1985-08-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985126404U JPH0338899Y2 (en) | 1985-08-19 | 1985-08-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6234712U JPS6234712U (en) | 1987-02-28 |
| JPH0338899Y2 true JPH0338899Y2 (en) | 1991-08-16 |
Family
ID=31020176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985126404U Expired JPH0338899Y2 (en) | 1985-08-19 | 1985-08-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338899Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2902527B2 (en) * | 1992-10-30 | 1999-06-07 | 日立電線株式会社 | Method of manufacturing cable for laying in pipeline |
| JP5147532B2 (en) * | 2008-05-16 | 2013-02-20 | 中国電力株式会社 | Inundation detection system and inundation detection method using this system |
-
1985
- 1985-08-19 JP JP1985126404U patent/JPH0338899Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6234712U (en) | 1987-02-28 |
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