JPS60262070A - Monitoring of metal shielding layer for power cable - Google Patents
Monitoring of metal shielding layer for power cableInfo
- Publication number
- JPS60262070A JPS60262070A JP11827884A JP11827884A JPS60262070A JP S60262070 A JPS60262070 A JP S60262070A JP 11827884 A JP11827884 A JP 11827884A JP 11827884 A JP11827884 A JP 11827884A JP S60262070 A JPS60262070 A JP S60262070A
- Authority
- JP
- Japan
- Prior art keywords
- shielding layer
- power cable
- metal shielding
- direct current
- monitoring
- 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
【発明の詳細な説明】
本発明は、電カケーブルの金属遮蔽層の劣化を監視する
電カケーブルの金属遮蔽層監視方法に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring a metal shielding layer of an electric power cable for monitoring deterioration of the metal shielding layer of the electric power cable.
電カケーブルの金属遮蔽層は、一般に、絶縁体のトに金
属テープをラップ巻きして形成されるが、電カケーブル
の防水性が低下して金属遮蔽層に多量の水分が含まれる
と、ラップ間の接触抵抗が上昇して劣化し、電カケーブ
ルの遮蔽゛効果が低下し、外部への影響が大きくなって
好ま＋１＜ない。また、金属遮蔽層が劣化しているとい
うことは水分が多線に侵入していることを意：味するか
ら絶縁材料が水トリー劣化を引き起している可能性が大
きい。The metal shielding layer of an electric power cable is generally formed by wrapping metal tape around an insulator, but if the waterproofness of the electric power cable decreases and the metal shielding layer contains a large amount of water, The contact resistance between the wraps increases and deteriorates, the shielding effect of the power cable decreases, and the influence on the outside becomes large, which is unfavorable. Furthermore, if the metal shielding layer has deteriorated, it means that moisture has entered the multiple wires, so there is a high possibility that the insulating material is causing water tree deterioration.
本発明の目的は、金属遮蔽層の劣化を迅速に検出して電
カケーブルの遮蔽効果の低下を早急に防ぐことができる
電ケーブルの金属遮蔽層監視方法を提供することにある
。An object of the present invention is to provide a method for monitoring a metal shielding layer of an electric cable, which can quickly detect deterioration of the metal shielding layer and promptly prevent the deterioration of the shielding effect of the electric cable.
本発明の実施例を図面を参照して詳細に説明すると１図
面は本発明の方法を概略的に示し。Embodiments of the invention will be described in detail with reference to the drawings, one of which schematically shows the method of the invention.
この方法では電カケーブル１０の金属遮蔽層１２の両端
に電流計１４を介して直流電源１６を接続し、電流計１
４によって金属遮蔽層１２に流れる直流電流Ｉを検出す
る。In this method, a DC power source 16 is connected to both ends of the metal shielding layer 12 of the power cable 10 via an ammeter 14, and the ammeter 1
4 detects the direct current I flowing through the metal shielding layer 12.
既にのべたように、金属遮蔽層１２は１例えば、銅テー
プをラップ巻して形成されるが、この金属遮蔽層１２は
その内部に水分を含むと。As already mentioned, the metal shielding layer 12 is formed by wrapping a copper tape, for example, and this metal shielding layer 12 contains moisture inside.
ラップ間の接触抵抗が上昇するので直流電流■が減少す
る。従って、電流計１４により直流電１１ｔ、Ｉを検…
することによって金属遮蔽層１２の劣化の程度を測定す
ることができる。例えば。Since the contact resistance between the wraps increases, the DC current (■) decreases. Therefore, the DC current 11t, I is detected by the ammeter 14...
By doing so, the degree of deterioration of the metal shielding layer 12 can be measured. for example.
新品の１５ＫＶ電カケ−プルの銅テープ遮蔽層の抵抗値
は第２図に示すように平均６オーム／□。１枠準い、オ
ーＡ ／ ｋ ｍ ｃｙ）分布、有を慕つ従って、直流
電流Ｉが正常値の分布を変化した場合には遮蔽層が劣化
したものと考えることができる。例えば、遮蔽層が劣化
すると、抵抗＠４は２０オ一ム／ｋｍ程度となり、検出
される直流電流工は３０％減少する。The resistance value of the copper tape shielding layer of the new 15KV power cable is 6 ohms/□ on average, as shown in Figure 2. Therefore, if the DC current I changes from its normal value distribution, it can be considered that the shielding layer has deteriorated. For example, as the shielding layer deteriorates, the resistance @4 will be on the order of 20 ohms/km and the detected DC current will decrease by 30%.
本発明によれば、１−記のように、電カケーブルの金属
遮蔽層の劣化を容易に検出することができる実益がある
。According to the present invention, as described in 1-, there is a practical advantage that deterioration of a metal shielding layer of an electric power cable can be easily detected.
第１図は本発明の方法を実施する状態を示す概略系統図
、第２図は金属遮蔽層の抵抗値の正常分布を示す図であ
る。
１０−−−−一電力ケーブル、１２−−−−−金属遮蔽
層、１４−−−−一電流計、１６−−−−−直流電源、
Ｉ −−−−一直流電流。
第１図
第２図
３ ６ ９’ ｎ
＋
３８６−FIG. 1 is a schematic system diagram showing a state in which the method of the present invention is carried out, and FIG. 2 is a diagram showing a normal distribution of resistance values of a metal shielding layer. 10-----------------------------------------------one power cable;
I - - - Direct current. Figure 1 Figure 2 3 6 9' n + 386-
Claims (1)
前記金属遮蔽層に流れる直流電流から前記遮蔽層の劣化
を検出することを特徴とする電カケーブルの金属遮蔽層
監視方法。Connect a DC power source to both ends of the metal shielding layer of the power cable,
A method for monitoring a metal shielding layer of an electric power cable, characterized in that deterioration of the shielding layer is detected from a direct current flowing through the metal shielding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11827884A JPS60262070A (en) | 1984-06-11 | 1984-06-11 | Monitoring of metal shielding layer for power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11827884A JPS60262070A (en) | 1984-06-11 | 1984-06-11 | Monitoring of metal shielding layer for power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60262070A true JPS60262070A (en) | 1985-12-25 |
Family
ID=14732696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11827884A Pending JPS60262070A (en) | 1984-06-11 | 1984-06-11 | Monitoring of metal shielding layer for power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60262070A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005111636A1 (en) * | 2004-05-13 | 2005-11-24 | Philips Intellectual Property & Standards Gmbh | Method of operating a shielded connection, and communications network |
| JP2009181695A (en) * | 2008-01-29 | 2009-08-13 | Yazaki Corp | Water infiltration detection structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5423987A (en) * | 1977-07-22 | 1979-02-22 | Showa Electric Wire & Cable Co | Method of monitoring abnormality in cable shielding layer |
| JPS54114781A (en) * | 1978-02-27 | 1979-09-07 | Showa Electric Wire & Cable Co | Plastic highhtension cable line |
-
1984
- 1984-06-11 JP JP11827884A patent/JPS60262070A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5423987A (en) * | 1977-07-22 | 1979-02-22 | Showa Electric Wire & Cable Co | Method of monitoring abnormality in cable shielding layer |
| JPS54114781A (en) * | 1978-02-27 | 1979-09-07 | Showa Electric Wire & Cable Co | Plastic highhtension cable line |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005111636A1 (en) * | 2004-05-13 | 2005-11-24 | Philips Intellectual Property & Standards Gmbh | Method of operating a shielded connection, and communications network |
| JP2009181695A (en) * | 2008-01-29 | 2009-08-13 | Yazaki Corp | Water infiltration detection structure |
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