JPH08219966A - Method for diagnosing deterioration of wire/cable - Google Patents
Method for diagnosing deterioration of wire/cableInfo
- Publication number
- JPH08219966A JPH08219966A JP2543595A JP2543595A JPH08219966A JP H08219966 A JPH08219966 A JP H08219966A JP 2543595 A JP2543595 A JP 2543595A JP 2543595 A JP2543595 A JP 2543595A JP H08219966 A JPH08219966 A JP H08219966A
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- cable
- deterioration
- wire
- sheath
- 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.)
- Withdrawn
Links
- 230000006866 deterioration Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000012212 insulator Substances 0.000 claims abstract description 11
- 238000003745 diagnosis Methods 0.000 claims description 14
- 230000015556 catabolic process Effects 0.000 claims 1
- 238000006731 degradation reaction Methods 0.000 claims 1
- 229920003023 plastic Polymers 0.000 abstract description 7
- 239000004033 plastic Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 229920001875 Ebonite Polymers 0.000 abstract 1
- 230000001186 cumulative effect Effects 0.000 description 6
- 230000001066 destructive effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 5
- 238000007542 hardness measurement Methods 0.000 description 5
- 229920001084 poly(chloroprene) Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000005060 rubber Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電線・ケーブルの劣化
を非破壊的に診断する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for nondestructively diagnosing deterioration of electric wires and cables.
【０００２】[0002]
【従来の技術】一般に電線・ケーブルは、長期の使用に
より様々な要因によって電気的あるいは機械的に劣化
し、正常かつ安全な機能が損なわれることがあり、この
ため、従来より、布設されている電線・ケーブルに対
し、定期的にその劣化状態を診断し、必要ならば取り替
えるなどして、かかる劣化による事故の発生を未然に防
止している。2. Description of the Related Art Generally, electric wires and cables may be deteriorated electrically or mechanically due to various factors due to various factors due to long-term use, and their normal and safe functions may be impaired. Electric wires and cables are periodically diagnosed for deterioration and replaced if necessary to prevent accidents due to such deterioration.
【０００３】従来、このような電線・ケーブルの劣化診
断は、布設現場から部分的に切断撤去して作成した試料
について引張試験や電気試験などを行う破壊試験が一般
に用いられてきた。しかしながら、このような方法は、
手間がかかるうえ、実施によって電線・ケーブルが使用
できなくなるなどの問題があった。このため、電線・ケ
ーブルを撤去することなく、布設状態のまま非破壊的に
劣化診断し得る方法の開発が求められ、例えば、絶縁体
の tanδを測定する方法、直流電圧による充電電荷の減
衰時定数から絶縁抵抗を求めて劣化を判定する電位減衰
法などの方法が提案されてきている。[0003] Conventionally, for such a deterioration diagnosis of electric wires / cables, a destructive test in which a tensile test or an electrical test is conducted on a sample prepared by partially cutting and removing from an installation site has been generally used. However, such a method
In addition to the time-consuming work, there was a problem that the wires and cables could not be used due to the implementation. For this reason, it is necessary to develop a method that enables non-destructive diagnosis of deterioration in the installed condition without removing the wires and cables. Methods such as a potential decay method for determining deterioration by obtaining insulation resistance from a constant have been proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、これら
はいずれも、遮蔽層を有する中、高圧用の電線・ケーブ
ルに適用できるものであって、遮蔽層のない 600V 程度
以下の低圧用のものには適用できないという問題があっ
た。このため、低圧用電線・ケーブルについては、今な
お、撤去した電線・ケーブルについて破壊試験により機
械的特性や電気特性の低下、特に伸びの低下を測定する
方法が用いられているのが実状である。一方、近時、低
圧用電線・ケーブルの劣化診断にも適用可能な非破壊的
診断方法として、電線・ケーブルの絶縁体あるいはシー
スの硬度を超音波硬度計により測定し、その硬度の変化
から劣化を診断する方法が提案されている。However, these are all applicable to high-voltage electric wires / cables having a shielding layer, and are not suitable for low-voltage applications of about 600 V or less without a shielding layer. There was a problem that it could not be applied. For this reason, with respect to low-voltage electric wires and cables, the method of measuring the deterioration of mechanical properties and electrical characteristics, especially the decrease of elongation, by destructive testing of the removed electric wires and cables is still used. . On the other hand, recently, as a non-destructive diagnostic method applicable to the deterioration diagnosis of low-voltage wires / cables, the hardness of the insulator / sheath of the wire / cable is measured with an ultrasonic hardness meter, and the deterioration due to the change in hardness. A method of diagnosing is suggested.
【０００５】しかしながら、この方法は、超音波硬度計
を用いるため、信頼性の高い診断は困難であった。すな
わち、超音波硬度計は、振動子を被測定物表面に押し付
けて微振動させ、その共振周波数を調べることによって
硬度を測定するものであるため、金属やアクリル樹脂な
どの硬質プラスチックに対しては比較的精度の高い測定
が可能であるが、電線・ケーブルの被覆材料として一般
に用いられているようなゴムや軟質プラスチックに対し
ては、損失（動的 tanδ）が非常に大きいため、再現性
のよい硬度測定ができず、したがって、これを用いる劣
化診断は信頼性に乏しいものとなる。However, since this method uses an ultrasonic hardness meter, reliable diagnosis is difficult. That is, since the ultrasonic hardness meter measures the hardness by pressing the vibrator against the surface of the object to be measured and slightly vibrating it and checking the resonance frequency thereof, it is not necessary for hard plastic such as metal or acrylic resin. Although relatively accurate measurement is possible, the loss (dynamic tan δ) is extremely large for rubber and soft plastics that are commonly used as coating materials for electric wires and cables, so reproducibility is high. Good hardness cannot be measured, and therefore deterioration diagnosis using this method becomes unreliable.
【０００６】本発明はこのような従来の事情に対処して
なされたもので、遮蔽層を有する電線・ケーブルのみな
らず、遮蔽層のない低圧用電線・ケーブルに対しても、
布設状態のまま非破壊的に劣化診断することができ、し
かも、信頼性の高い診断を行うことができる電線・ケー
ブルの劣化診断方法を提供することを目的とする。The present invention has been made in consideration of such conventional circumstances, and not only for electric wires / cables having a shielding layer but also for low voltage electric wires / cables having no shielding layer,
It is an object of the present invention to provide a method for diagnosing deterioration of electric wires / cables, which enables nondestructive deterioration diagnosis in a laid state and highly reliable diagnosis.
【０００７】[0007]
【課題を解決するための手段】本発明の電線・ケーブル
の劣化診断方法は、電線・ケーブル表面の絶縁体または
シースの表面硬度を、押圧荷重に基づく硬度測定法によ
り測定し、その硬度の変化から劣化の度合いを診断する
ことを特徴とするものである。A method for diagnosing deterioration of electric wires / cables according to the present invention is to measure the surface hardness of an insulator or a sheath on the surface of an electric wire / cable by a hardness measuring method based on a pressing load, and change its hardness. It is characterized by diagnosing the degree of deterioration from.
【０００８】ここで、押圧荷重に基づく硬度測定法と
は、試料に押圧荷重を加え、そのときの試料の変位から
硬度を測定するもので、具体的には、押針をスプリング
の力で試料表面に押し付け、試料の抵抗力とスプリング
の力が平衡状態となったときの押針の押込み深さから試
料の硬度（相対値）を求める、いわゆるスプリング式か
たさ試験機などを用いることができる。Here, the hardness measuring method based on the pressing load is to measure the hardness from the displacement of the sample at the time when the pressing load is applied to the sample. It is possible to use a so-called spring-type hardness tester, which presses against the surface and obtains the hardness (relative value) of the sample from the pushing depth of the push needle when the resistance of the sample and the force of the spring are in equilibrium.
【０００９】このような硬度測定法においては、試料に
押圧荷重を加えるだけなので、電線・ケーブルを撤去す
ることなく布設状態のままで、その表面硬度を測定する
ことができ、しかも、軟質、硬質を問わず各種のゴム・
プラスチック材料に対し再現性の高い硬度測定が可能で
ある。そして、この方法により測定された絶縁体または
シースの表面硬度の電線・ケーブルの劣化にともなう挙
動は、絶縁体またはシースの破壊試験による伸びなどの
機械的特性の変化とよく相関しており、したがって、た
とえば予め、診断すべき電線・ケーブルと同じ電線・ケ
ーブルについて、かかる硬度測定法による絶縁体または
シースの表面硬度と劣化の度合いとの関係を求めておけ
ば、これと診断しようとする電線・ケーブルについて測
定した表面硬度とを対比させることにより、当該電線・
ケーブルの劣化の度合いを高い精度をもって診断するこ
とができる。In such a hardness measuring method, since only a pressing load is applied to the sample, the surface hardness can be measured in the installed state without removing the electric wire / cable, and it is soft and hard. Various rubbers regardless of
Highly reproducible hardness measurement is possible for plastic materials. The behavior of the surface hardness of the insulator or sheath measured by this method that accompanies the deterioration of the wire or cable correlates well with changes in mechanical properties such as elongation due to the destructive test of the insulator or sheath. , For example, if the relationship between the surface hardness of the insulator or sheath by the hardness measurement method and the degree of deterioration is obtained in advance for the same wire / cable as the wire / cable to be diagnosed, the wire to be diagnosed By comparing the surface hardness measured for the cable,
The degree of cable deterioration can be diagnosed with high accuracy.
【００１０】なお、上記スプリング式かたさ試験機で
は、場合によって電線・ケーブルの表面に押針による穴
を生ずることがあるが、この穴は極めて小さく、測定後
に絶縁テープなどを巻き付けることにより簡単に修復す
ることができ、使用上何ら問題となることはない。すな
わち、この測定の際に生じた穴によって電線・ケーブル
の電気的あるいは機械的特性が低下することはない。In the above-mentioned spring type hardness tester, a hole due to a push needle may be formed on the surface of the electric wire / cable in some cases, but this hole is extremely small and can be easily repaired by winding an insulating tape or the like after measurement. It is possible and does not cause any problem in use. That is, the holes formed during this measurement do not deteriorate the electrical or mechanical characteristics of the electric wire / cable.
【００１１】また、スプリング式かたさ試験機を用いる
場合、測定しようとする電線・ケーブルの絶縁体あるい
はシースの厚さが、押針の押込み深さに比べ十分に厚
く、また、測定時に電線・ケーブルに歪みが生じないよ
うにすることが望ましく、これによって、より精度の高
い硬度測定が可能となり、劣化診断の信頼性を向上させ
ることができる。When a spring type hardness tester is used, the thickness of the insulator or sheath of the electric wire / cable to be measured is sufficiently thicker than the pushing depth of the push needle, and the electric wire / cable at the time of measurement is used. It is desirable that no distortion occurs in the sample, which enables more accurate hardness measurement and improves the reliability of deterioration diagnosis.
【００１２】[0012]
【作用】本発明方法においては、電線・ケーブル表面の
絶縁体またはシースの表面硬度を、押圧荷重に基づく硬
度測定法により測定し、その硬度の変化から劣化の度合
いを診断するものであり、押圧荷重に基づく硬度測定法
によれば、上記したように、電線・ケーブルを撤去する
ことなく布設状態のままで、その表面硬度を測定するこ
とができ、しかも、軟質、硬質を問わず各種のゴム・プ
ラスチック材料に対し再現性の高い硬度測定が可能なた
め、各種の電線・ケーブルに対し、布設下で信頼性の高
い劣化診断を行うことができる。In the method of the present invention, the surface hardness of the insulator or sheath on the surface of the electric wire / cable is measured by the hardness measuring method based on the pressing load, and the degree of deterioration is diagnosed from the change in the hardness. According to the hardness measurement method based on load, as described above, the surface hardness can be measured in the installed state without removing the electric wire / cable, and various rubbers, soft or hard, can be measured.・ Since hardness measurement with high reproducibility is possible for plastic materials, it is possible to perform highly reliable deterioration diagnosis for various electric wires and cables under installation.
【００１３】[0013]
【実施例】以下、本発明を、原子力施設などで使用され
る、最外層に軟質塩化ビニル樹脂からなるシースを有す
る600V級ケーブルおよび最外層にクロロプレンゴムから
なるシースを有する600V級ケーブルを例に説明する。EXAMPLES The present invention will be described below by taking as an example a 600V class cable having a sheath made of a soft vinyl chloride resin as the outermost layer and a 600V class cable having a sheath made of chloroprene rubber as the outermost layer, which are used in nuclear facilities. explain.
【００１４】実施例１ 最外層に軟質塩化ビニル樹脂からなるシース（厚さ 1.5
mm）を有する600V用ケーブルに、実環境を模擬して、
（ａ） 130℃の温度で加熱、（ｂ）室温で 330Gy/ hrの
線量率でγ線を照射、および（ｃ）90℃の温度下で 50G
y/hrの線量率でγ線を照射して劣化させ、（ａ）および
（ｃ）では、所定の日数が経過したところで、また、
（ｂ）では、所定の線量を照射したところで、シースの
表面硬度をJIS 規格のスプリング式かたさ試験機（高分
子計器株式会社製 アスカーＤ型ゴム・プラスチック硬
度計）を用いて測定し、劣化日数もしくは積算線量に対
するシースの表面硬度の変化を調べた。Example 1 A sheath made of soft vinyl chloride resin (thickness: 1.5) as the outermost layer.
mm) to 600V cable, imitating the real environment,
(A) Heated at a temperature of 130 ° C, (b) Irradiated with γ-rays at a dose rate of 330 Gy / hr at room temperature, and (c) 50 G at a temperature of 90 ° C.
Irradiation with γ-rays at a dose rate of y / hr causes deterioration, and in (a) and (c), when a predetermined number of days have passed,
In (b), the surface hardness of the sheath was measured with a JIS-standard spring hardness tester (Asker D-type rubber / plastic hardness meter manufactured by Kobunshi Keiki Co., Ltd.) after irradiation at a prescribed dose, and the number of days of deterioration was measured. Alternatively, the change in the surface hardness of the sheath with respect to the cumulative dose was investigated.
【００１５】また、同様の条件で劣化させたケーブルに
ついて、破壊試験によりシースの伸びを測定し、劣化日
数もしくは積算線量に対するシースの伸びの変化を調べ
た。図１はこのようにして測定したシースの表面硬度と
劣化日数もしくは積算線量との関係を示すグラフ、ま
た、図２はシースの伸びと劣化日数もしくは積算線量と
の関係を示すグラフである。The elongation of the sheath was measured by a destructive test for the cable deteriorated under the same conditions, and the change in the elongation of the sheath with respect to the number of days of deterioration or the cumulative dose was examined. FIG. 1 is a graph showing the relationship between the surface hardness of the sheath thus measured and the number of days of deterioration or cumulative dose, and FIG. 2 is a graph showing the relationship between the elongation of the sheath and the number of days of deterioration or cumulative dose.
【００１６】これらのグラフからも明らかなように、い
ずれの劣化条件の場合にも、劣化によるシースの表面硬
度の変化と伸びの変化には良好な相関関係があり、した
がって、予めこのようなシースの表面硬度と劣化の度合
いの関係を求めておけば、実際に布設されている電線・
ケーブルのシースの表面硬度を測定することにより、当
該電線・ケーブルの劣化の度合いを精度よくしかも容易
に診断することができる。As is clear from these graphs, under any deterioration condition, there is a good correlation between the change in the surface hardness of the sheath due to the deterioration and the change in the elongation. If the relationship between the surface hardness of the
By measuring the surface hardness of the cable sheath, the degree of deterioration of the electric wire / cable can be accurately and easily diagnosed.
【００１７】実施例２ 最外層にクロロプレンゴムからなるシース（厚さ 1.5m
m）を有する600V用ケーブルに対し、実施例１の場合と
同様にして上記（ａ）〜（ｃ）の条件で劣化させ、各劣
化によるシースの表面硬度の変化、および伸びの変化を
調べた。なお、表面硬度の測定は、JIS 規格のスプリン
グ式かたさ試験機（高分子計器株式会社製アスカーＪＡ
型ゴム・プラスチック硬度計）を用いて行った。Example 2 A sheath (thickness: 1.5 m) made of chloroprene rubber was used as the outermost layer.
The cable for 600V having m) was deteriorated under the conditions (a) to (c) in the same manner as in Example 1, and changes in the surface hardness of the sheath and changes in elongation due to each deterioration were examined. . The surface hardness is measured by a JIS standard spring type hardness tester (Asker JA manufactured by Kobunshi Keiki Co., Ltd.).
Type rubber / plastic hardness tester).
【００１８】図３は、このようにして測定したシースの
表面硬度と劣化日数もしくは積算線量との関係を示すグ
ラフ、また、図４はシースの伸びと劣化日数もしくは積
算線量との関係を示すグラフで、実施例１の場合と同
様、この実施例においても、劣化によるシースの表面硬
度の変化と伸びの変化には良好な相関関係があり、実布
設されている電線・ケーブルのシースの表面硬度を測定
することにより、当該電線・ケーブルの劣化の度合いを
精度よく診断することができることが確認された。FIG. 3 is a graph showing the relationship between the surface hardness of the sheath thus measured and the number of days of deterioration or cumulative dose, and FIG. 4 is a graph showing the relationship between the elongation of the sheath and the number of days of deterioration or cumulative dose. As in the case of Example 1, also in this Example, there is a good correlation between the change in the surface hardness of the sheath due to deterioration and the change in the elongation, and the surface hardness of the sheath of the actually installed wire / cable. It was confirmed that the degree of deterioration of the electric wire / cable can be accurately diagnosed by measuring.
【００１９】なお、上記実施例は、軟質塩化ビニル樹脂
またはクロロプレンゴムからなるシースを有する600V用
ケーブルへの適用例であるが、本発明はこのようなケー
ブルに限定されるものではなく、熱や放射線などにより
劣化する有機材料よりなる被覆を有するものであれば、
低圧、高圧にかかわらず各種電線・ケーブルに広く適用
されて、精度の高い劣化診断を行うことができる。The above embodiment is an example of application to a cable for 600V having a sheath made of soft vinyl chloride resin or chloroprene rubber, but the present invention is not limited to such a cable, and heat or heat If it has a coating made of an organic material that deteriorates due to radiation,
It is widely applied to various electric wires and cables regardless of low voltage and high voltage, and can perform highly accurate deterioration diagnosis.
【００２０】[0020]
【発明の効果】以上説明したように本発明方法によれ
ば、電線・ケーブル表面の絶縁体またはシースの表面硬
度を、押圧荷重に基づく硬度測定法により測定し、その
硬度の変化から劣化の度合いを診断するようにしたの
で、遮蔽層のない低圧用電線・ケーブルに対しても、布
設状態のまま非破壊的に劣化診断することができ、しか
も、信頼性の高い診断を行うことができる。As described above, according to the method of the present invention, the surface hardness of the insulator or sheath on the surface of the electric wire / cable is measured by the hardness measuring method based on the pressing load, and the degree of deterioration is determined from the change in the hardness. Since the diagnosis is made, it is possible to perform non-destructive deterioration diagnosis on the low-voltage electric wires / cables without a shielding layer in a laid state, and also to perform highly reliable diagnosis.
【図１】軟質塩化ビニル樹脂からなるシースを有する60
0V用ケーブルの劣化にともなうシースの表面硬度の変化
を示すグラフ。FIG. 1 has a sheath made of soft vinyl chloride resin 60
The graph which shows the change of the surface hardness of the sheath accompanying the deterioration of the 0V cable.
【図２】軟質塩化ビニル樹脂からなるシースを有する60
0V用ケーブルの劣化にともなうシースの破壊試験による
伸びの変化を示すグラフ。[Fig. 2] 60 having a sheath made of soft vinyl chloride resin
The graph which shows the change of the elongation by the destruction test of the sheath accompanying the deterioration of the 0V cable.
【図３】クロロプレンゴムからなるシースを有する600V
用ケーブルの劣化にともなうシースの表面硬度の変化を
示すグラフ。[Fig. 3] 600V with a sheath made of chloroprene rubber
6 is a graph showing a change in the surface hardness of the sheath due to the deterioration of the cable for use.
【図４】クロロプレンゴムからなるシースを有する600V
用ケーブルの劣化にともなうシースの破壊試験による伸
びの変化を示すグラフ。FIG. 4 600V with a sheath made of chloroprene rubber
3 is a graph showing changes in elongation due to a sheath breakage test due to deterioration of a cable for use.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 富田 淳子 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 新井 泰雄 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 (72)発明者 中川 学 東京都千代田区内幸町１丁目１番３号 東 京電力株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junko Tomita 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Cable Denki Co., Ltd. No. 3 in Tokyo Electric Power Company (72) Inventor Manabu Nakagawa 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Tokyo Electric Power Company
Claims (2)
スの表面硬度を、押圧荷重に基づく硬度測定法により測
定し、その硬度の変化から劣化の度合いを診断すること
を特徴とする電線・ケーブルの劣化診断方法。1. The surface hardness of an insulator or sheath on the surface of an electric wire / cable is measured by a hardness measuring method based on a pressing load, and the degree of deterioration is diagnosed from the change in the hardness. Degradation diagnosis method.
試験機により行うことを特徴とする請求項１記載の電線
・ケーブルの劣化診断方法。2. The method for diagnosing deterioration of an electric wire / cable according to claim 1, wherein the surface hardness is measured by a spring type hardness tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2543595A JPH08219966A (en) | 1995-02-14 | 1995-02-14 | Method for diagnosing deterioration of wire/cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2543595A JPH08219966A (en) | 1995-02-14 | 1995-02-14 | Method for diagnosing deterioration of wire/cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08219966A true JPH08219966A (en) | 1996-08-30 |
Family
ID=12165915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2543595A Withdrawn JPH08219966A (en) | 1995-02-14 | 1995-02-14 | Method for diagnosing deterioration of wire/cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08219966A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012215497A (en) * | 2011-04-01 | 2012-11-08 | Mitsubishi Electric Corp | Deterioration diagnostic device of power cable coating |
| CN110702545A (en) * | 2019-10-21 | 2020-01-17 | 西南交通大学 | Pantograph/contact net coupling system operation test stand and test method thereof |
-
1995
- 1995-02-14 JP JP2543595A patent/JPH08219966A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012215497A (en) * | 2011-04-01 | 2012-11-08 | Mitsubishi Electric Corp | Deterioration diagnostic device of power cable coating |
| CN110702545A (en) * | 2019-10-21 | 2020-01-17 | 西南交通大学 | Pantograph/contact net coupling system operation test stand and test method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020507 |