JPH0769375B2 - Method for detecting conductor breakage of electric wire cable having composite stranded wire with many strands - Google Patents
Method for detecting conductor breakage of electric wire cable having composite stranded wire with many strandsInfo
- Publication number
- JPH0769375B2 JPH0769375B2 JP63246919A JP24691988A JPH0769375B2 JP H0769375 B2 JPH0769375 B2 JP H0769375B2 JP 63246919 A JP63246919 A JP 63246919A JP 24691988 A JP24691988 A JP 24691988A JP H0769375 B2 JPH0769375 B2 JP H0769375B2
- Authority
- JP
- Japan
- Prior art keywords
- wire
- conductor
- cable
- disconnection
- resistance
- 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
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は電線・ケーブルの導体抵抗を測定することによ
り、導体断線を検知する電線・ケーブルの導体断線検知
方法に関し、特に、高周波電流を用いて高周波導体抵抗
を測定することにより、導体断線検知の精度向上を図る
ようにした電線・ケーブルの導体断線検知方法に関す
る。Description: TECHNICAL FIELD The present invention relates to a conductor disconnection detection method for an electric wire / cable, which detects a conductor disconnection by measuring the conductor resistance of the electric wire / cable, and particularly uses a high-frequency current. The present invention relates to a method for detecting conductor breakage in an electric wire / cable for improving the accuracy of conductor breakage detection by measuring high-frequency conductor resistance.
従来、電線・ケーブルの導体断線を検知する方法とし
て、電線・ケーブルの導体に直流電流を流し、抵抗値を
測定する方法が一般的に用いられている。この方法は、
測定によって得られた直流抵抗値を、予め実験によって
求められた導体の抵抗増加率と断線率（断線素線数／全
体の素線数×100）の関係に照らし合わせて、導体の断
線状況（断線率）を判定するものである。Conventionally, as a method of detecting conductor breakage of an electric wire / cable, a method of applying a direct current to the conductor of the electric wire / cable and measuring a resistance value is generally used. This method
The direct current resistance value obtained by the measurement was compared with the relationship between the conductor resistance increase rate and the wire breakage rate (the number of wire breakage wires / the total number of wire wires x 100), which was obtained in advance by experiment, and the conductor wire breakage condition ( The disconnection rate) is determined.
他の検知方法として、予め電線・ケーブルの製造工程に
おいて、線心に比べて機械的強度（屈曲，捻回，振動
等）が劣る導体を断線検出線として設ける方法、また
は、機械的歪みや損傷を受けやすい部位に導体を配置し
て断線寿命検知線とする方法等が提案されている。As another detection method, in a wire / cable manufacturing process, a conductor having a mechanical strength (bending, twisting, vibration, etc.) that is inferior to the core of the wire is provided as a disconnection detection wire, or mechanical strain or damage is detected. There has been proposed a method of disposing a conductor in a portion that is easily affected by a breakage life detection line.
しかし、従来の電線・ケーブルの直流抵抗を測定し、断
線を検知する方法によれば、断線状況を判定する目安と
して、抵抗増加率と断線率の関係を用いているが、抵抗
増加率と断線率の関係は、実験あるいは測定によるバラ
ツキが大きいため、必ずしも適確に断線を検知すること
が困難であるという問題点がある。また、断線検知を必
要とする様な電線・ケーブル、例えば、移動用ケーブル
では一般的に耐屈曲性を向上させるため、細線化、即
ち、素線数を多くした複合撚り線としており、素線が断
線しても素線間の接触面が大きく断線初期段階での導体
直流抵抗の増加は極めて小さいため、断線検知の測定を
行っても断線初期段階の検知は困難であると言う不都合
があった。However, according to the conventional method of measuring the DC resistance of electric wires / cables and detecting the disconnection, the relationship between the resistance increase rate and the disconnection rate is used as a guide for determining the disconnection status. There is a problem that it is difficult to detect the disconnection properly because the relationship of the rates greatly varies depending on the experiment or the measurement. In addition, wires and cables that require wire breakage detection, for example, moving cables, are generally made thin, that is, a composite stranded wire with a large number of wires, in order to improve bending resistance. Even if the wire breaks, the contact surface between the wires is large, and the increase in the DC resistance of the conductor at the early stage of wire breakage is extremely small.Therefore, there is the inconvenience that it is difficult to detect the wire breakage early stage even if the wire breakage detection is measured. It was
一方、電線・ケーブル中に断線検出線，あるいは断線寿
命検知線を設ける方法は、断線検出線，あるいは断線寿
命検知線と、通常線心導体との断線寿命のバランスをと
る事が極めて難しく、実用化されていないのが現状であ
る。On the other hand, the method of providing the wire breakage detection wire or the wire break life detection wire in the wire / cable is extremely difficult to balance the wire break life between the wire break detection wire or the wire break life detection wire and the normal wire core conductor. The current situation is that it has not been realized.
本発明は上記に鑑みてなされたものであり、その目的と
するところは、素線数を多くした複合撚線を有する電線
・ケーブルの断線検知の精度を向上させ、かつ、断線初
期段階での検知を確実に行えるようにした電線・ケーブ
ルの導体断線検知方法を提供することである。The present invention has been made in view of the above, and an object thereof is to improve the accuracy of wire breakage detection of an electric wire / cable having a composite twisted wire with a large number of strands, and at the early stage of wire breakage. It is an object of the present invention to provide a conductor disconnection detection method for electric wires / cables, which enables reliable detection.
本発明は以上に述べた目的を実現するため、高周波電流
を用いて素線数を多くした複合撚線を有する電線・ケー
ブルの導体抵抗を測定するようにした電線・ケーブルの
導体断線検知方法を提供する。In order to achieve the above-mentioned object, the present invention provides a method for detecting conductor breakage of an electric wire / cable for measuring the conductor resistance of an electric wire / cable having a composite stranded wire having a large number of strands by using a high-frequency current. provide.
即ち、本発明の電線・ケーブルの導体断線検知方法は、
素線数を多くした複合撚線を有する電線・ケーブルの導
体外表面を表皮効果によって流れる高周波電流に基づい
て導体外表面の高周波抵抗を測定し、もって、導体を構
成する複合撚線の最外層素線の断線を検知するものであ
る。高周波電流を通電して導体抵抗を測定する場合、電
流は表皮効果によって外表面を流れようとするため、測
定される導体抵抗は外表面の抵抗に大きく影響されたも
のとなる。換言すれば、測定結果は外表面の抵抗状態の
変化を適確に反映するものとなる。That is, the conductor disconnection detection method of the electric wire / cable of the present invention is
The outermost layer of the composite stranded wire that constitutes the conductor is measured by measuring the high-frequency resistance of the outer surface of the conductor based on the high-frequency current that flows through the outer surface of the conductor of the wire / cable that has a composite stranded wire with a large number of strands due to the skin effect. It is intended to detect a wire break. When a conductor resistance is measured by passing a high-frequency current, the current tries to flow on the outer surface due to the skin effect, so that the measured conductor resistance is greatly influenced by the resistance of the outer surface. In other words, the measurement result accurately reflects the change in the resistance state of the outer surface.
一方、電線・ケーブルが屈曲を受けた際に生じる屈曲歪
みは中心が最小で、外表面に近づくにつれて大きくな
る。これはケーブルを構成する線心の導体に関しても同
様であり、故に、導体の素線断線は最外層素線から発生
する。従って、高周波電流を用いて、高周波抵抗を測定
することにより、最も断線の発生し易い外表面の状態
を、適確に検知することができ、故に測定が難しかった
複合撚線について正確な断線検知できる。On the other hand, the bending strain that occurs when an electric wire or cable is bent has a minimum center and increases as it approaches the outer surface. This also applies to the conductors of the cores of the cable, and therefore the conductor wire breakage occurs from the outermost layer wire. Therefore, by measuring the high-frequency resistance using a high-frequency current, it is possible to accurately detect the state of the outer surface where disconnection is most likely to occur, and therefore accurate disconnection detection for complex twisted wires that was difficult to measure. it can.
以下、本発明の実施例を詳細に説明する。測定対象とし
て、移動用ケーブル１を準備し、第１図に示す様に、高
周波電源2,電流計3,電圧計４を配置した。尚、５はケー
ブルヘッドを示す。Hereinafter, examples of the present invention will be described in detail. As a measurement target, a moving cable 1 was prepared, and a high frequency power supply 2, an ammeter 3 and a voltmeter 4 were arranged as shown in FIG. In addition, 5 shows a cable head.
以上の構成において、高周波電源２より高周波電流を素
線数を多くした複合撚線を有するところの移動用ケーブ
ル１に流し、電流計3,電圧計４により電流Ｉおよび電圧
Ｖを測定し、抵抗値（Ｒ＝V/I）を求めた。一方比較の
ために同一条件で、高周波電源２を直流電源に換えて測
定を行った。In the above configuration, a high-frequency current is supplied from the high-frequency power source 2 to the moving cable 1 having a composite stranded wire having a large number of strands, the current I and the voltage V are measured by the ammeter 3 and the voltmeter 4, and the resistance is measured. The value (R = V / I) was determined. On the other hand, for comparison, the high-frequency power supply 2 was replaced with a direct-current power supply and the measurement was performed under the same conditions.
第２図は、高周波電流と直流電流において、外表面部分
の断線が抵抗の変化にどの様に現れるかを調べたもので
あり、第１図に示した構成で電圧を変化させ、その時の
電圧V,および電流Ｉを測定し、抵抗Ｒの逆数1/Rを直線
の傾きとして示したものである。ラインａは断線のない
移動用ケーブル１に高周波電流を流した値、ラインｂは
断線のない移動用ケーブル１に直流電流を流した値を示
している。ここでラインａの傾きとラインｂの傾きを比
較すると、ラインａの傾きが小さくなっている。直線の
傾きが1/Rであることから、換言すれば、ラインａの抵
抗が大きいことが示されており、高周波電流の表皮効果
による抵抗の増加を示している。さらに、ラインａ′は
断線率約10％の移動用ケーブル１に高周波電流を流した
値、ラインｂ′は断線率約10％の移動用ケーブル１に直
流電流を流した値を示している。グラフから明らかなよ
うに、断線率約10％の移動用ケーブル１の測定における
抵抗の増加は直流電流（ラインｂとラインｂ′の差）に
比較して高周波電流（ラインａとラインａ′の差）が顕
著である。これは断線した素線を有する導体の外表面の
抵抗の変化（断線の発生）を高周波電流がより適確に検
知できることを示している。Fig. 2 shows how the disconnection of the outer surface appears in the resistance change under high frequency current and DC current. The voltage is changed by the configuration shown in Fig. 1. V and current I are measured, and the reciprocal 1 / R of resistance R is shown as the slope of a straight line. Line a shows a value when a high-frequency current is passed through the moving cable 1 without disconnection, and line b shows a value when a direct current is passed through the moving cable 1 without disconnection. Here, comparing the inclination of the line a and the inclination of the line b, the inclination of the line a is small. Since the slope of the straight line is 1 / R, in other words, it is shown that the resistance of the line a is large, which shows an increase in resistance due to the skin effect of the high frequency current. Further, a line a'represents a value obtained by applying a high frequency current to the moving cable 1 having a disconnection rate of about 10%, and a line b'represents a value obtained by applying a direct current to the moving cable 1 having a disconnection rate of about 10%. As is apparent from the graph, the increase in resistance in the measurement of the moving cable 1 having a disconnection rate of about 10% is higher than that of the direct current (difference between the line b and the line b ') by the high frequency current (line a and line a'). Difference) is remarkable. This indicates that the high-frequency current can more accurately detect the change in resistance (occurrence of disconnection) on the outer surface of the conductor having the disconnected wire.
以上説明した通り、本発明の電線・ケーブルの導体断線
検知方法によれば、高周波電流を用いて、高周波抵抗を
測定するようにしたため、最も断線の発生し易い外表面
の状態を、適確に検知することが可能となり、断線検知
の精度を向上させ、ひいては素線数を多くした複合撚線
の素線断線を的確に検知でき、かつ、断線初期段階での
検知を確実に行うことができる。さらに二次的効果とし
て、断線を初期段階で適確に検知できるため、機器類の
停止等の事故を未然に防止することができ、また、断線
時期を予測して早めに交換する等の無駄を省くことがで
きる。As described above, according to the conductor disconnection detection method for an electric wire / cable of the present invention, since the high frequency resistance is measured by using the high frequency current, the state of the outer surface where the disconnection is most likely to occur is accurately performed. It becomes possible to detect the wire breakage, improve the accuracy of wire breakage detection, and moreover, it is possible to accurately detect the wire breakage of the composite stranded wire with a large number of wires, and it is possible to reliably perform the detection at the initial stage of wire breakage. . Furthermore, as a secondary effect, disconnection can be detected accurately at the initial stage, so it is possible to prevent accidents such as equipment stoppages, and it is wasteful to predict the disconnection time and replace it early. Can be omitted.
第１図は本発明の実施例を示す説明図。第２図は断線初
期段階の抵抗の変化を示す説明図。 符号の説明 １……移動用ケーブル ２……高周波電源 ３……電流計 ４……電圧計 ５……ケーブルヘッドFIG. 1 is an explanatory view showing an embodiment of the present invention. FIG. 2 is an explanatory diagram showing changes in resistance at the initial stage of disconnection. Explanation of code 1 …… Movement cable 2 …… High frequency power supply 3 …… Ammeter 4 …… Voltmeter 5 …… Cable head
Claims (1)
ケーブルの導体外表面を表皮効果によって流れる高周波
電流に基づいて導体外表面の高周波抵抗を測定し、もっ
て、導体を構成する複合撚線の最外層素面の断線を検知
することを特徴とする、素線数を多くした複合撚線を有
する電線・ケーブルの導体断線検知方法。1. An electric wire having a composite stranded wire having a large number of strands.
The high-frequency resistance of the outer surface of the conductor is measured based on the high-frequency current flowing on the outer surface of the conductor of the cable due to the skin effect, and thus the disconnection of the outermost layer surface of the composite stranded wire that constitutes the conductor is detected. A method for detecting conductor breaks in electric wires and cables that have a complex stranded wire with a large number of wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246919A JPH0769375B2 (en) | 1988-09-30 | 1988-09-30 | Method for detecting conductor breakage of electric wire cable having composite stranded wire with many strands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63246919A JPH0769375B2 (en) | 1988-09-30 | 1988-09-30 | Method for detecting conductor breakage of electric wire cable having composite stranded wire with many strands |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0295273A JPH0295273A (en) | 1990-04-06 |
| JPH0769375B2 true JPH0769375B2 (en) | 1995-07-31 |
Family
ID=17155706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63246919A Expired - Lifetime JPH0769375B2 (en) | 1988-09-30 | 1988-09-30 | Method for detecting conductor breakage of electric wire cable having composite stranded wire with many strands |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0769375B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SK287699B6 (en) | 2001-06-20 | 2011-06-06 | Aloys Wobben | Synchronous machine, wind energy plant comprising synchronous machine and method for monitoring operation of synchronous machine |
| JP5754359B2 (en) | 2011-11-24 | 2015-07-29 | 株式会社豊田自動織機 | Non-contact power supply device and non-contact power supply system |
| JP6550002B2 (en) * | 2016-03-14 | 2019-07-24 | 株式会社日立産機システム | Power conditioner and method of detecting theft of cable connected thereto |
| JP7268783B2 (en) * | 2021-09-17 | 2023-05-08 | 株式会社プロテリアル | Cable condition control device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS518503Y2 (en) * | 1971-12-17 | 1976-03-06 | ||
| JPS5465842U (en) * | 1977-10-19 | 1979-05-10 |
-
1988
- 1988-09-30 JP JP63246919A patent/JPH0769375B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0295273A (en) | 1990-04-06 |
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