JPS55129770A - Detecting method for cable failure position - Google Patents
Detecting method for cable failure positionInfo
- Publication number
- JPS55129770A JPS55129770A JP3764479A JP3764479A JPS55129770A JP S55129770 A JPS55129770 A JP S55129770A JP 3764479 A JP3764479 A JP 3764479A JP 3764479 A JP3764479 A JP 3764479A JP S55129770 A JPS55129770 A JP S55129770A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- distance
- burst
- frequency
- relay
- 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)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
PURPOSE: To enable to detect the distance between cable failure point and relay unit immediately in the vicinity, by setting the burst length of the burst signal come from the terminal station and of which frequency is periodically changed, to the specific length or more.
CONSTITUTION: The transmission section 11 of the failure position detector 10 delivers the burst signal 1 having fundamental frequency fA and burst length T. The frequency fA is made variable, and the burst length T is made longer than 2(l0+ l1)/c. Where; l0 is the distance between relay units, l1 is the distance from the relay unit 2-M to failure occurrence point F, and c is the propagation speed of signal. When the original signal is transmitted from the transmission section 11, since the burst signal 2 having the fundamental frequency 2fA produced at a number of relay units on the way of the cable is reversed, it is received at the reception section via the hybrid 2. At the reception section, the gate circuit 13 opens from 2(M-1) l0/c seconds to 2Ml0/c seconds by measuring from the time of end of the original signal to pick up the signal 3. Where M is the number of relay units. Further, the distance l1 can be obtained by reading in the period of the change in the intensity of the pickup signal 3.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3764479A JPS55129770A (en) | 1979-03-29 | 1979-03-29 | Detecting method for cable failure position |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3764479A JPS55129770A (en) | 1979-03-29 | 1979-03-29 | Detecting method for cable failure position |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55129770A true JPS55129770A (en) | 1980-10-07 |
JPS6313372B2 JPS6313372B2 (en) | 1988-03-25 |
Family
ID=12503351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3764479A Granted JPS55129770A (en) | 1979-03-29 | 1979-03-29 | Detecting method for cable failure position |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55129770A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6232651U (en) * | 1985-08-14 | 1987-02-26 | ||
JPS63261932A (en) * | 1987-04-20 | 1988-10-28 | Nec Corp | Fault point location system |
JPH01117433A (en) * | 1987-10-30 | 1989-05-10 | Nec Corp | Optical cable system monitor system |
US5751149A (en) * | 1995-12-08 | 1998-05-12 | Tempo Research Corporation | Method and apparatus for high frequency time domain reflectometry |
CN102788935A (en) * | 2012-08-23 | 2012-11-21 | 广州供电局有限公司 | Method for simulating cable failure location by using bridge method |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01158263U (en) * | 1988-04-21 | 1989-11-01 |
-
1979
- 1979-03-29 JP JP3764479A patent/JPS55129770A/en active Granted
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6232651U (en) * | 1985-08-14 | 1987-02-26 | ||
JPS63261932A (en) * | 1987-04-20 | 1988-10-28 | Nec Corp | Fault point location system |
JPH01117433A (en) * | 1987-10-30 | 1989-05-10 | Nec Corp | Optical cable system monitor system |
US5751149A (en) * | 1995-12-08 | 1998-05-12 | Tempo Research Corporation | Method and apparatus for high frequency time domain reflectometry |
CN102788935A (en) * | 2012-08-23 | 2012-11-21 | 广州供电局有限公司 | Method for simulating cable failure location by using bridge method |
Also Published As
Publication number | Publication date |
---|---|
JPS6313372B2 (en) | 1988-03-25 |
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