JPS6413471A - Method for measuring abnormal position of metallic shield layer - Google Patents
Method for measuring abnormal position of metallic shield layerInfo
- Publication number
- JPS6413471A JPS6413471A JP17061887A JP17061887A JPS6413471A JP S6413471 A JPS6413471 A JP S6413471A JP 17061887 A JP17061887 A JP 17061887A JP 17061887 A JP17061887 A JP 17061887A JP S6413471 A JPS6413471 A JP S6413471A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- point
- pulse
- reflected
- shield 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.)
- Granted
Links
Landscapes
- Locating Faults (AREA)
Abstract
PURPOSE:To accurately measure the extent of the insulation deterioration of a cable line and the position of the deterioration section by applying a pulse signal to the conductor of a cable and measuring the transmission time wherein a pulse is reflected first in the cable line and returns. CONSTITUTION:The cable consists of the conductor 1, the metallic shield layer 2, and an insulating layer. The shield layer 2 is formed by winding, for example, a copper tape around the insulating layer and when the part of a point C is dipped in water and rusted, the overlap part of the copper tape is insulated and enters the same state with the coil. Here, when electric pulses are implanted in the cable at a near terminal A from a pulse generator 3, reflected pulses from the point C are observed by a waveform observing device 4 at time t2. On the other hand, the the length L1 of the normal cable and transmission time t1 of the reflected pulse from a far terminal B are measured previously, so that the position of the point C can be known from L2=(L1/t1).t2 and (L2=AC and L1=AB). Further, the extent of water dipping deterioration of the cable can be known from the amplitude value of the reflected pulse from the point C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17061887A JPH0690254B2 (en) | 1987-07-08 | 1987-07-08 | Measuring method for abnormal parts of metal shielding layer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17061887A JPH0690254B2 (en) | 1987-07-08 | 1987-07-08 | Measuring method for abnormal parts of metal shielding layer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6413471A true JPS6413471A (en) | 1989-01-18 |
JPH0690254B2 JPH0690254B2 (en) | 1994-11-14 |
Family
ID=15908209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17061887A Expired - Fee Related JPH0690254B2 (en) | 1987-07-08 | 1987-07-08 | Measuring method for abnormal parts of metal shielding layer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0690254B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1054864A (en) * | 1996-08-08 | 1998-02-24 | Mitsubishi Cable Ind Ltd | Method for diagnosing deterioration of cable |
JP2006023105A (en) * | 2004-07-06 | 2006-01-26 | Hitachi Cable Ltd | Method of detecting disconnection in electric wire |
-
1987
- 1987-07-08 JP JP17061887A patent/JPH0690254B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1054864A (en) * | 1996-08-08 | 1998-02-24 | Mitsubishi Cable Ind Ltd | Method for diagnosing deterioration of cable |
JP2006023105A (en) * | 2004-07-06 | 2006-01-26 | Hitachi Cable Ltd | Method of detecting disconnection in electric wire |
Also Published As
Publication number | Publication date |
---|---|
JPH0690254B2 (en) | 1994-11-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |