JPH0534266A - Method for diagnosing deterioration of electric wire/ cable - Google Patents
Method for diagnosing deterioration of electric wire/ cableInfo
- Publication number
- JPH0534266A JPH0534266A JP18750891A JP18750891A JPH0534266A JP H0534266 A JPH0534266 A JP H0534266A JP 18750891 A JP18750891 A JP 18750891A JP 18750891 A JP18750891 A JP 18750891A JP H0534266 A JPH0534266 A JP H0534266A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- deterioration
- strain
- insulating material
- electric wire
- 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
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、発電所低圧ケーブル、
電線など活線状態で、非破壊劣化診断を行うための電線
・ケーブルの劣化診断方法に関する。BACKGROUND OF THE INVENTION The present invention relates to a power plant low voltage cable,
The present invention relates to a method for diagnosing deterioration of electric wires / cables for nondestructive deterioration diagnosis in a live state such as an electric wire.
【0002】[0002]
【従来の技術】原子力発電所を初めとする種々の発電所
には多様な電線・ケーブルが様々な環境下で多数布設さ
れている。2. Description of the Related Art A large number of various electric wires and cables are installed in various power plants including a nuclear power plant under various environments.
【0003】一般に発電所内で使用している電線類の大
半は、低圧である。これら電線類は、長期間に渡り、種
々な要因により経年劣化し、機械的・電気的な特性が低
下する。Generally, most of the electric wires used in a power plant have low voltage. These electric wires deteriorate over time due to various factors and their mechanical and electrical characteristics deteriorate.
【0004】発電所の長期安定運転及び長寿命化の観点
から布設電線・ケーブル類の劣化度および残存寿命を簡
単・明確に予想する方法が要求される。From the viewpoint of long-term stable operation and long service life of a power plant, a method for easily and clearly predicting the degree of deterioration and remaining life of installed electric wires and cables is required.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、従来の
低圧用電線・ケーブルの劣化診断には、定期点検時の目
視点検、或いは撤去による破壊試験(機械特性)により
評価していた。特に発電所内の多くを占める低圧用電線
・ケーブルの診断は、定期点検時に目視点検している
が、目視点検は個人的誤差が生じやすく定量的でなく確
実性に問題がある。またケーブルを撤去して検査する場
合は、ケーブルの撤去に多大な労力,時間を要する問題
がある。このように従来においては、適切な非破壊劣化
診断方法がなく、さらには定期点検以外に経時的に、し
かも活線状態で劣化をモニタする方法は確立されていな
い。However, in the conventional diagnosis of deterioration of low-voltage electric wires / cables, evaluation was carried out by visual inspection at the time of regular inspection or by a destructive test (mechanical characteristics) by removal. In particular, the diagnosis of low-voltage wires and cables, which occupy most of the power plant, is visually inspected at the time of regular inspection. However, the visual inspection tends to cause individual error and is not quantitative, and there is a problem in reliability. Further, when the cable is removed and inspected, there is a problem that it takes a lot of labor and time to remove the cable. As described above, conventionally, there is no suitable nondestructive deterioration diagnosis method, and further, a method for monitoring deterioration over time and in a live state other than regular inspection has not been established.
【0006】そこで、本発明の目的は、従来技術の欠点
を解消し、電線・ケーブルの劣化状況を簡便に診断でき
る電線・ケーブルの劣化診断方法を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for diagnosing deterioration of electric wires / cables by solving the drawbacks of the prior art and easily diagnosing the deterioration status of electric wires / cables.
【0007】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明は、電線・ケーブルの構成絶縁材に歪みゲージ
を貼付し、劣化に伴う絶縁材の体積変化を歪みゲージで
モニタして劣化を検知するものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention attaches a strain gauge to a constituent insulating material of an electric wire / cable, and monitors a change in volume of the insulating material due to deterioration with the strain gauge to deteriorate the material. Is to detect.
【0008】[0008]
【作用】上記構成によれば、劣化に伴う絶縁材の体積変
化を歪みゲージの電気信号の変化でモニタすることで、
ケーブルなどの劣化およびその程度が布設状態のまま経
時的に検知することができる。According to the above construction, the volume change of the insulating material due to the deterioration is monitored by the change of the electric signal of the strain gauge,
It is possible to detect deterioration and the degree of deterioration of the cable and the like over time while the cable is installed.
【0009】[0009]
【実施例】以下、本発明の一実施例を添付図面に基づい
て詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
【0010】図1において、1は3芯の低圧CV(架橋
ポリエチレン絶縁ビニルシース)ケーブルで、それぞれ
架橋ポリエチレンなどの絶縁体2で被覆された導体3
が、絶縁体であるポリ塩化ビニルシース4に収容されて
構成される。このケーブル1の最外層に微少な歪みを検
出する歪みゲージ5(共和ゲージ製,2軸トルク用35
0Ωゲージ)を代表的な接着剤であるCC−15Aを用
い貼付する。この歪みゲージ5はケーブル1に沿って適
宜数箇所布設稼働前或いは布設後貼付し、それぞれリー
ド線6を介して計測用コンディッショナ(共和製歪みゲ
ージ変換器、WGA−700A)7に接続しておく。In FIG. 1, reference numeral 1 is a three-core low-voltage CV (crosslinked polyethylene insulated vinyl sheath) cable, each of which is a conductor 3 covered with an insulator 2 such as crosslinked polyethylene.
Are housed in a polyvinyl chloride sheath 4 which is an insulator. A strain gauge 5 (manufactured by Kyowa Gauge, for biaxial torque 35) that detects a minute strain is formed in the outermost layer of the cable 1.
0Ω gauge) is attached using CC-15A which is a typical adhesive. These strain gauges 5 are appropriately attached at several points along the cable 1 before or after installation, and are connected to measurement conditioners (Kyowa strain gauge converter, WGA-700A) 7 via lead wires 6, respectively. deep.
【0011】以上において、ケーブル1は長期間経つ
と、劣化によりその体積が変化し、これが歪みとなって
現われる。そこで歪みゲージ5よりリード線6を介して
その電気信号を計測用コンディッショナ7でモニタする
ことで、劣化とその程度が検出できる。In the above, the cable 1 changes its volume due to deterioration after a long period of time, and this appears as distortion. Therefore, by monitoring the electric signal from the strain gauge 5 via the lead wire 6 by the measuring conditioner 7, the deterioration and its degree can be detected.
【0012】次により具体的な実験例を説明する。A specific experimental example will be described below.
【0013】ケーブル試料を実環境劣化を適切に模擬
し、50℃に設定した恒温槽中に入れ、酸素加圧下、1
KGy/hの線量率で、放射線照射し、約40年相当の
劣化を与えた。所定時間(所定相当年数毎)に、試料を
各3本づつ取り出し、伸びの経時変化,体積収縮の経時
変化及び歪みゲージの歪み量の試験に供した。The cable sample was appropriately simulated for actual environment deterioration and placed in a constant temperature bath set at 50 ° C., and under oxygen pressure, 1
Irradiation was performed at a dose rate of KGy / h, and deterioration was given for approximately 40 years. At a predetermined time (every predetermined number of years), three samples were taken out and subjected to tests of the change of elongation with time, the change of volume contraction with time, and the strain amount of the strain gauge.
【0014】図2はビニルシースの伸びの経時変化を示
し、図3は経時劣化に伴うビニルシースの体積収縮を初
期値に対する相対値として示し、図4はビニルシースの
体積収縮を歪みゲージを介し歪み量として検知した結果
を示したものである。また図5はビニルシースの伸びと
歪みゲージの応答(歪み量)の相関を示す。FIG. 2 shows the change over time in the elongation of the vinyl sheath, FIG. 3 shows the volume contraction of the vinyl sheath due to deterioration over time as a relative value to the initial value, and FIG. 4 shows the volume contraction of the vinyl sheath as the amount of strain through a strain gauge. It shows the result of detection. Further, FIG. 5 shows the correlation between the elongation of the vinyl sheath and the response (strain amount) of the strain gauge.
【0015】図2よりシースの相対伸びは40相当年で
初期の伸びの25%まで下がり、また図3に示すようシ
ースの相対体積は、40相当年で初期の80%程度まで
減少する。更にシースの歪み量は初期をゼロとすると、
40相当年で2.5×10 -3ストレイン上昇すること
が確認できた。また図5に示すように、熱・放射線劣化
によるビニルシースの伸びと歪みゲージの応答(歪み
量)の相関を見たところ、よい相関関係があり、これに
よりシースなどの絶縁体に歪みゲージを貼付し、その信
号変化により電線・ケーブルの寿命を決定する伸びを非
破壊的に推定でき、しかも活線状態で経時的に診断およ
び残存寿命の予測が行える。From FIG. 2, the relative elongation of the sheath decreases to 25% of the initial elongation in 40 years, and as shown in FIG. 3, the relative volume of the sheath decreases to about 80% of the initial year in 40 years. Furthermore, if the initial strain of the sheath is zero,
It was confirmed that the strain increased by 2.5 × 10 -3 in 40 years. Also, as shown in Fig. 5, when the correlation between the elongation of the vinyl sheath due to heat and radiation deterioration and the response (strain amount) of the strain gauge is found to be good, the strain gauge is attached to the insulator such as the sheath. However, it is possible to nondestructively estimate the elongation that determines the lifespan of the electric wire / cable by the signal change, and further, it is possible to make a diagnosis and predict the remaining lifespan over time in a live state.
【0016】尚上述の実施例においては、絶縁体として
ポリ塩化ビニルの例を示したが、その他、多くの有機材
料からなる絶縁体に適用できることは勿論である。すな
わち、有機材料一般は、劣化により体積収縮などの外形
の変化を必ず生じるといっても過言でなく、従ってこの
変化を歪みゲージで診れば、その劣化と程度が検知でき
る。In the above embodiments, polyvinyl chloride was used as the insulator, but it is needless to say that it can be applied to insulators made of many organic materials. In other words, it is no exaggeration to say that organic materials generally undergo a change in outer shape such as volume contraction due to deterioration, and therefore, the deterioration and the degree can be detected by observing this change with a strain gauge.
【0017】[0017]
【発明の効果】以上要するに本発明によれば、ケーブル
のシースの歪み量を検出することでケーブルの劣化度を
検知できる。また活線状態で常時劣化をモニタできる。
またケーブルに沿って多数歪みゲージを設ければ、ケー
ブル長のうちどの区間が劣化しているかまたその劣化度
を特定できる。In summary, according to the present invention, the degree of deterioration of the cable can be detected by detecting the strain amount of the cable sheath. In addition, deterioration can be constantly monitored in a live state.
Further, if a large number of strain gauges are provided along the cable, it is possible to specify which section of the cable length is deteriorated and the deterioration degree thereof.
【図1】本発明の一実施例を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of the present invention.
【図2】本発明において、ビニルシースの伸びの経時変
化を示しす図である。FIG. 2 is a view showing a change with time of elongation of a vinyl sheath in the present invention.
【図3】本発明において、経時劣化に伴うビニルシース
の体積収縮変化を示す図である。FIG. 3 is a diagram showing a change in volumetric shrinkage of a vinyl sheath due to deterioration over time in the present invention.
【図4】本発明において、ビニルシースの体積収縮を歪
みゲージを介し歪み量として検知した結果を示す図であ
る。FIG. 4 is a diagram showing a result of detecting volume contraction of a vinyl sheath as a strain amount via a strain gauge in the present invention.
【図5】本発明において、ビニルシースの伸びと歪みゲ
ージの応答(歪み量)の相関を示す図である。FIG. 5 is a diagram showing the correlation between the elongation of the vinyl sheath and the response (strain amount) of the strain gauge in the present invention.
1 ケーブル 4 ビニルシース(絶縁体) 5 歪みゲージ 7 計測用コンディッショナ 1 Cable 4 Vinyl sheath (insulator) 5 Strain gauge 7 Conditioner for measurement
Claims (1)
ジを貼付し、劣化に伴う絶縁材の体積変化を歪みゲージ
でモニタして劣化を検知することを特徴とする電線・ケ
ーブルの劣化診断方法。Claims: 1. An electric wire characterized in that a strain gauge is attached to a constituent insulating material of an electric wire / cable, and a change in volume of the insulating material due to deterioration is monitored by the strain gauge to detect the deterioration. -Cable deterioration diagnosis method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18750891A JPH0534266A (en) | 1991-07-26 | 1991-07-26 | Method for diagnosing deterioration of electric wire/ cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18750891A JPH0534266A (en) | 1991-07-26 | 1991-07-26 | Method for diagnosing deterioration of electric wire/ cable |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0534266A true JPH0534266A (en) | 1993-02-09 |
Family
ID=16207293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18750891A Pending JPH0534266A (en) | 1991-07-26 | 1991-07-26 | Method for diagnosing deterioration of electric wire/ cable |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0534266A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61257849A (en) * | 1985-05-10 | 1986-11-15 | Konishiroku Photo Ind Co Ltd | Sensitive material feeding device |
CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
-
1991
- 1991-07-26 JP JP18750891A patent/JPH0534266A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61257849A (en) * | 1985-05-10 | 1986-11-15 | Konishiroku Photo Ind Co Ltd | Sensitive material feeding device |
JPH0534266B2 (en) * | 1985-05-10 | 1993-05-21 | Konishiroku Photo Ind | |
CN105866015A (en) * | 2016-05-12 | 2016-08-17 | 远东电缆有限公司 | Method and system for evaluating ageing life of crosslinked polyethylene insulating cable for smart energy |
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