CN108061843A - A kind of equipment for Cable Fault Location - Google Patents
A kind of equipment for Cable Fault Location Download PDFInfo
- Publication number
- CN108061843A CN108061843A CN201711439476.5A CN201711439476A CN108061843A CN 108061843 A CN108061843 A CN 108061843A CN 201711439476 A CN201711439476 A CN 201711439476A CN 108061843 A CN108061843 A CN 108061843A
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- cable
- speed
- microprocessor
- equipment
- pulse signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
The equipment for Cable Fault Location of the present invention, by prestore in the database different model, batch, manufacturer cable corresponding to cable speed, on the basis of accurately pulse signal spread speed in the cable is obtained, the precision of ranging can be improved；When the pulse signal frequency of transmission does not have corresponding experimental data in speed characteristic curve, more accurate speed is obtained by the linear interpolation of log-domain；In addition, the present invention is also corrected speed by temperature information to further improve final range accuracy.
Description
Technical field
The present invention relates to a kind of cable detecting device more particularly to a kind of equipment for Cable Fault Location.
Background technology
With the rapid development of the national economy, electric power has become the indispensable energy, electric energy is transmitted to by power circuit
Huge numbers of families are then interconnected by cable between power grid.However, due to being subject to environment or aging action residing for cable
Influence, cable fault happens occasionally.Cable fault can cause large-area power-cuts, in turn result in large range of influence.Cable,
The cable of underground is especially layed in, position of fault lookup difficulty is big after generating failure.
Common cable distance measuring method has bridge method, time domain reflectometry and frequency domain bounce technique at present, wherein, time domain reflectometry
Advantage is easy to operate than more prominent, single-ended operation, and measuring accuracy is higher.Illustrate as shown in Figure 1 for the wiring of time domain reflectometry
Figure, operation principle are to add pulse voltage in cable one end, then this pulse is transmitted as along certain spread speed, in trouble point
It reflects, records the transmission time Δ T sent between pulse and reflected impulse, then can calculate event by transmission speed V
Hinder the distance L=Δs TV/2 of point., it can be seen that, obtain the basis that accurate spread speed is time domain reflectometry range accuracy.
Under normal circumstances, it is believed that the spread speed of pulse signal in the cable is the light velocity, however, due to different model, batch, manufacturer
The cable produced is in the difference of the factors such as material, property, and causing pulse signal, all there are larger difference, examples in spread speed
As the spread speed of YJV type twisted polyethylene cables between 156-174m/us, the polytetrafluoroethylene (PTFE) electricity of model KFVP
Spread speed in cable is generally in 210m/us or so.Therefore, existing cable fault localization method, it is clear that can cause larger
Error.
The content of the invention
Present invention seek to address that problems of the prior art, provide a kind of equipment for Cable Fault Location, in database
In prestore different model, batch, manufacturer cable corresponding to cable speed, accurately obtain pulse signal in cable
In spread speed on the basis of, the precision of ranging can be improved；In addition, the present invention also carries out school by temperature information to speed
Just.
Technical scheme is as follows：A kind of equipment for Cable Fault Location, which is characterized in that emit and connect including signal
Receive module, propagation time measurement module, speed characteristics database, microprocessor, temperature sensor, test parameter input module；
Signal transmitting and receiving module are connected with the cable under test and the propagation time measurement module, for
The cable under test emits pulse signal, and receives reflected signal；
The test parameter input module is connected with the microprocessor, for being tested to the microprocessor input cable
Parameter；
The speed characteristics database is connected with the microprocessor, is joined for storing cable speed with the wireline test
The corresponding speed characteristic curve of number；
The propagation time measurement module is connected with the microprocessor, for measuring the propagation of pulse signal in the cable
Time T, and it is sent to the microprocessor；
The temperature sensor is connected with the microprocessor, for measuring the temperature of cable under test local environment, concurrently
Give the microprocessor；
The microprocessor is measured with speed characteristics database, signal transmitting and receiving module, the propagation time
Module is connected, for speed characteristic curve described in the speed characteristics data base querying, and according to the wireline test parameter,
The speed characteristic curve, the pulse signal propagation time in the cable and the temperature, to the cable under test into
Row fault localization.
Preferably, the wireline test parameter includes model, batch, manufacturer's information and the arteries and veins of the cable under test
Rush the frequency of signal.
Preferably, after the microprocessor obtains the wireline test parameter of the cable under test, according to the speed characteristics
Curve obtains spread speed V of the pulse signal in the cable under test；The microprocessor according to formula L=VT/2,
Ask for trouble point distance L.
Preferably, also it is stored with temperature correction coefficient in the speed characteristics database.
Preferably, temperature correction coefficient of the microprocessor according to corresponding to the temperature of the environment carries out school to speed
Just.
The equipment for Cable Fault Location of the present invention is by the database prestoring different model, batch, manufacturer
Cable speed corresponding to cable on the basis of the spread speed of pulse signal in the cable is accurately obtained, can improve survey
Away from precision；When the pulse signal frequency of transmission does not have corresponding experimental data in speed characteristic curve, pass through log-domain
Linear interpolation obtain more accurate speed；In addition, the present invention is also corrected speed by temperature information so as into one
Step improves final range accuracy.
Description of the drawings
Fig. 1 is the wiring schematic diagram of time domain reflectometry in the prior art；
Fig. 2 is the schematic diagram of the equipment for Cable Fault Location of the present invention；
Fig. 3 is the cable speed performance diagram of the present invention.
Specific embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1：Fig. 2 is the schematic diagram of the equipment for Cable Fault Location of the present invention；The cable speed that Fig. 3 is the present invention is special
Linearity curve figure, cable under test are Xi'an cable companies in the video cables of the model SYV75-5 of production in 2016.Referring to Fig. 2-
3, equipment for Cable Fault Location of the invention, including signal transmitting and receiving module, propagation time measurement module, speed characteristics number
According to storehouse, microprocessor, temperature sensor, test parameter input module.
Signal emits and receiving module is connected with cable under test and propagation time measurement module, for the cable under test
Emit pulse signal, and receive reflected signal.In the present embodiment, signal transmitting and receiving module are to cable under test tranmitting frequency
1×105The pulse signal of Hz, and receive reflected signal.
The test parameter input module is connected with the microprocessor, for being tested to the microprocessor input cable
Parameter, the model of wireline test parameter including the cable under test, batch, the frequency of manufacturer's information and pulse signal.This
In embodiment, the type information inputted by test parameter input module is SYV75-5, and batch is 2016, and manufacturer is west
Pacify certain cable companies.
The speed characteristics database is connected with the microprocessor, is joined for storing cable speed with the wireline test
The corresponding speed characteristic curve of number.Speed characteristic curve is the frequency of pulse signal and the pass of its spread speed V in the cable
It is curve, temperature correction coefficient is also stored in speed characteristics database.In the present embodiment, the temperature correction coefficient of cable under test
For -0.24%, i.e., often increase by 1 DEG C for 20 DEG C compared to room temperature, then speed reduces 0.24%.Speed characteristic curve and temperature correction system
Number is all in laboratory environments, to be drawn by control variate method：Its dependent variable is controlled to remain unchanged, only changes pulse signal
Frequency, such as 10Hz, 100Hz, 1000Hz ... 109Hz, measures corresponding spread speed, speed characteristic curve be it is a series of from
Scatterplot composition；Its dependent variable is controlled to remain unchanged, only changes environment temperature, temperature correction coefficient is obtained by linear fit.
The propagation time measurement module is connected with the microprocessor, for measuring the propagation of pulse signal in the cable
Time T, and it is sent to the microprocessor.In the present embodiment, propagation time T=146ns.
The temperature sensor is connected with the microprocessor, for measuring the temperature of cable under test local environment, concurrently
It gives the microprocessor, in the present embodiment, measures environment temperature as 27 DEG C.
The microprocessor is measured with speed characteristics database, signal transmitting and receiving module, the propagation time
Module is connected, for speed characteristic curve described in the speed characteristics data base querying, in the present embodiment, passing through cable under test
Model, batch, manufacturer's information and the frequency for emitting signal, inquire emission signal frequency as 1 × 105The situation of Hz
Under, spread speed of the signal in cable under test is 181m/us.Temperature of the microprocessor according to corresponding to the temperature of the environment
Calibration factor is corrected speed, and in the present embodiment, temperature correction coefficient is -0.24%, and environment temperature is 27 DEG C, by school
Just, velocity amplitude 178m/us.The microprocessor according to formula L=VT/2, ask for trouble point distance L=178m/us ×
146ns/2=12.99m.If being calculated using light velocity approximate propagation speed, the result drawn is 21.90m, and error is almost
It can not receive.
Embodiment 2：The equipment for Cable Fault Location of the present invention, including signal transmitting and receiving module, propagation time measurement
Module, speed characteristics database, microprocessor, temperature sensor, test parameter input module.
Signal emits and receiving module is connected with cable under test and propagation time measurement module, for the cable under test
Emit pulse signal, and receive reflected signal.In the present embodiment, signal transmitting and receiving module are to cable under test tranmitting frequency
5×105The pulse signal of Hz, and receive reflected signal.
The test parameter input module is connected with the microprocessor, for being tested to the microprocessor input cable
Parameter, the model of wireline test parameter including the cable under test, batch, the frequency of manufacturer's information and pulse signal.This
In embodiment, the type information inputted by test parameter input module is SYV75-5, and batch is 2016, and manufacturer is west
Pacify certain cable companies.
The speed characteristics database is connected with the microprocessor, is joined for storing cable speed with the wireline test
The corresponding speed characteristic curve of number.Speed characteristic curve is the frequency of pulse signal and the pass of its spread speed V in the cable
It is curve, temperature correction coefficient is also stored in speed characteristics database.In the present embodiment, the temperature correction coefficient of cable under test
For -0.24%, i.e., often increase by 1 DEG C for 20 DEG C compared to room temperature, then speed reduces 0.24%.Speed characteristic curve and temperature correction system
Number is all in laboratory environments, to be drawn by control variate method：Its dependent variable is controlled to remain unchanged, only changes pulse signal
Frequency, such as 10Hz, 100Hz, 1000Hz ... 109Hz, measures corresponding spread speed, speed characteristic curve be it is a series of from
Scatterplot composition；Its dependent variable is controlled to remain unchanged, only changes environment temperature, temperature correction coefficient is obtained by linear fit.
The propagation time measurement module is connected with the microprocessor, for measuring the propagation of pulse signal in the cable
Time T, and it is sent to the microprocessor.In the present embodiment, propagation time T=146ns.
The temperature sensor is connected with the microprocessor, for measuring the temperature of cable under test local environment, concurrently
It gives the microprocessor, in the present embodiment, measures environment temperature as 27 DEG C.
The microprocessor is measured with speed characteristics database, signal transmitting and receiving module, the propagation time
Module is connected, for speed characteristic curve described in the speed characteristics data base querying, in the present embodiment, passing through cable under test
Model, batch, manufacturer's information and the frequency for emitting signal, inquire emission signal frequency as 5 × 105The situation of Hz
Under, there is no corresponding experimental datas, at this time by the linear interpolation of log-domain, calculate spread speed as 193m/us.Micro- place
Temperature correction coefficient of the device according to corresponding to the temperature of the environment is managed to be corrected speed, in the present embodiment, temperature correction
Coefficient is -0.24%, and environment temperature is 27 DEG C, corrected, velocity amplitude 190m/us.The microprocessor is according to formula L=
VT/2 asks for trouble point distance L=190m/us × 146ns/2=13.87m.If it is counted using light velocity approximate propagation speed
It calculates, then the result drawn is 21.90m, and error can not almost receive.
It can be seen that the present invention equipment for Cable Fault Location by prestore in the database different model, batch,
Cable speed corresponding to the cable of manufacturer, on the basis of the spread speed of pulse signal in the cable is accurately obtained, energy
Enough improve the precision of ranging；When the pulse signal frequency of transmission does not have corresponding experimental data in speed characteristic curve, lead to
The linear interpolation for crossing log-domain obtains more accurate speed；In addition, the present invention is also corrected speed by temperature information
So as to further improve final range accuracy.
The present invention is exemplarily described above in association with attached drawing.Obviously, the present invention implements and from above-mentioned side
The limitation of formula.As long as employ the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (6)
1. a kind of equipment for Cable Fault Location, which is characterized in that including signal transmitting and receiving module, propagation time measurement mould
Block, speed characteristics database, microprocessor, temperature sensor, test parameter input module；
Signal transmitting and receiving module are connected with cable under test and the propagation time measurement module, for described to be measured
Cable emits pulse signal, and receives reflected signal；
The test parameter input module is connected with the microprocessor, is joined for being tested to the microprocessor input cable
Number；
The speed characteristics database is connected with the microprocessor, for storing cable speed and the wireline test parameter pair
The speed characteristic curve answered；
The propagation time measurement module is connected with the microprocessor, for measuring the propagation time of pulse signal in the cable
T, and it is sent to the microprocessor；
The temperature sensor is connected with the microprocessor, for measuring the temperature of cable under test local environment, and is sent to
The microprocessor；
The microprocessor and speed characteristics database, signal transmitting and receiving module, the propagation time measurement module
It is connected, for speed characteristic curve described in the speed characteristics data base querying, and according to the wireline test parameter, described
Speed characteristic curve, the pulse signal propagation time in the cable and the temperature, the cable under test is carried out therefore
Hinder ranging.
2. equipment for Cable Fault Location according to claim 1, which is characterized in that the wireline test parameter includes described
The model of cable under test, batch, the frequency of manufacturer's information and pulse signal.
3. equipment for Cable Fault Location according to claim 1, which is characterized in that the microprocessor obtains described to be measured
After the wireline test parameter of cable, biography of the pulse signal in the cable under test is obtained according to the speed characteristic curve
Broadcast speed V；The microprocessor asks for trouble point distance L according to formula L=VT/2.
4. equipment for Cable Fault Location according to claim 3, which is characterized in that the speed characteristic curve is believed for pulse
Number frequency and the relation curve of its spread speed V in the cable.
5. according to claim 1-4 any one of them equipment for Cable Fault Location, which is characterized in that the speed characteristics data
Temperature correction coefficient is also stored in storehouse.
6. equipment for Cable Fault Location according to claim 5, which is characterized in that the microprocessor is according to the environment
Temperature corresponding to temperature correction coefficient distance measurement result is corrected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711439476.5A CN108061843B (en) | 2017-12-27 | 2017-12-27 | A kind of equipment for Cable Fault Location |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711439476.5A CN108061843B (en) | 2017-12-27 | 2017-12-27 | A kind of equipment for Cable Fault Location |
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| Publication Number | Publication Date |
|---|---|
| CN108061843A true CN108061843A (en) | 2018-05-22 |
| CN108061843B CN108061843B (en) | 2018-10-30 |
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ID=62140247
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711439476.5A Active CN108061843B (en) | 2017-12-27 | 2017-12-27 | A kind of equipment for Cable Fault Location |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257695A (en) * | 2020-03-02 | 2020-06-09 | 深圳供电局有限公司 | Cable defect detection method, device and system for double-end measurement |
| CN113822258A (en) * | 2021-11-24 | 2021-12-21 | 山东省计量科学研究院 | Cable length metering method and device and storage medium |
| CN116879683A (en) * | 2023-09-04 | 2023-10-13 | 湖南华菱线缆股份有限公司 | Method and device for identifying local defects of high-voltage power cable |
| CN118091328A (en) * | 2024-04-20 | 2024-05-28 | 江西四联节能环保股份有限公司 | Abnormal fault prediction method and system for distribution cable |
| CN118091328B (en) * | 2024-04-20 | 2024-07-05 | 江西四联节能环保股份有限公司 | Abnormal fault prediction method and system for distribution cable |
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| CN104215848A (en) * | 2014-08-27 | 2014-12-17 | 西安空间无线电技术研究所 | Time-domain dynamic correction method for cable measurement errors in temperature test |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257695A (en) * | 2020-03-02 | 2020-06-09 | 深圳供电局有限公司 | Cable defect detection method, device and system for double-end measurement |
| CN113822258A (en) * | 2021-11-24 | 2021-12-21 | 山东省计量科学研究院 | Cable length metering method and device and storage medium |
| CN113822258B (en) * | 2021-11-24 | 2022-02-08 | 山东省计量科学研究院 | Cable length metering method and device and storage medium |
| CN116879683A (en) * | 2023-09-04 | 2023-10-13 | 湖南华菱线缆股份有限公司 | Method and device for identifying local defects of high-voltage power cable |
| CN116879683B (en) * | 2023-09-04 | 2023-11-10 | 湖南华菱线缆股份有限公司 | Method and device for identifying local defects of high-voltage power cable |
| CN118091328A (en) * | 2024-04-20 | 2024-05-28 | 江西四联节能环保股份有限公司 | Abnormal fault prediction method and system for distribution cable |
| CN118091328B (en) * | 2024-04-20 | 2024-07-05 | 江西四联节能环保股份有限公司 | Abnormal fault prediction method and system for distribution cable |
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| CN108061843B (en) | 2018-10-30 |
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Application publication date: 20180522 Assignee: WENZHOU HAILAN INDUSTRIAL DESIGN Co.,Ltd. Assignor: WENLING CHUANGJIA INFORMATION SCIENCE & TECHNOLOGY Co.,Ltd. Contract record no.: X2021330000132 Denomination of invention: A cable fault location device Granted publication date: 20181030 License type: Common License Record date: 20210826 |
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Application publication date: 20180522 Assignee: WENZHOU QIBANG ENVIRONMENTAL PROTECTION SCIENCE & TECHNOLOGY Co.,Ltd. Assignor: WENLING CHUANGJIA INFORMATION SCIENCE & TECHNOLOGY Co.,Ltd. Contract record no.: X2021330000354 Denomination of invention: A cable fault location device Granted publication date: 20181030 License type: Common License Record date: 20210927 |
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Effective date of registration: 20220120 Address after: 450000 No. 1105, tower a, Newton international, middle section of Yangjin Road, Jinshui District, Zhengzhou City, Henan Province Patentee after: ZHEJIANG UBISOR TECHNOLOGY Co.,Ltd. Address before: 317523 Taizhou, Zhejiang province Wenling City zhe town 889 Ze Chai Road, Wenling, Wenling business and trade 9 building two units 708 rooms. Patentee before: WENLING CHUANGJIA INFORMATION SCIENCE & TECHNOLOGY Co.,Ltd. |
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