CN106841838A - The device and method of the cable shield status monitoring based on the measurement of frequency sweep reflection power - Google Patents
The device and method of the cable shield status monitoring based on the measurement of frequency sweep reflection power Download PDFInfo
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- CN106841838A CN106841838A CN201611039935.6A CN201611039935A CN106841838A CN 106841838 A CN106841838 A CN 106841838A CN 201611039935 A CN201611039935 A CN 201611039935A CN 106841838 A CN106841838 A CN 106841838A
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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
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Abstract
The invention discloses it is a kind of based on frequency sweep reflection power measurement cable shield status monitoring device and method, by implementation of the invention, can obtain communication cable shielding layer whether the advantageous information (data) of normal work；After device installation, the foundation of specific cut cable monitor database and big data are analyzed by database server, can be contrasted and self study to the state of database input cable screen layer actual motion during cable maintenance with reference to attendant, constantly improve cable shield monitor database, the cable fault alarm of final achievable high accuracy and the cable fault positioning function of degree of precision.
Description
Technical field
The present invention relates to a kind of device and method of the cable shield status monitoring based on the measurement of frequency sweep reflection power.
Background technology
Communication cable refers to the electricity for closely voice communication and the communication of remote high frequency carrier digital and signal transmission
Cable, is widely used in the key areas such as communication line, instrument and meter, electric power.Because many factors can cause communication cable
The failure such as be short-circuited, open a way.
To realize communication cable network online management and automatic fault diagnosis, the functional reliability of communication cable is improved, subtracted
The artificial investigation workload of few cable fault, improves the automaticity of communication cable, and the present invention proposes a kind of based on frequency sweep
The device and method of the communication cable shielding layer status monitoring of reflection power measurement, realizes the real-time online prison to communication cable
Survey.
Patent " one kind ground connection performance monitoring system and the communication cable shielding layer dynamic monitoring of Patent No. 102879703A
Method " provide one kind by measuring screen layer to core electric capacity, the integrality of dynamic surveillance wired communication cable screen layer
Method.But because capacitance signal is excessively single, carry cable status information content limited, it is difficult to the electricity under complex environment
Cable carries out positioning analysis.Simultaneously because the anti-transmission line input impedance of singal source resistance is mismatched, so certainty of measurement is low, error
Greatly.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that one kind is assessed and positioning cable based on the measurement of frequency sweep reflection power
The damaged device and method of screen layer, the present invention reduces the complexity of monitoring device, improves electricity from the angle of power attenuation
The stability of cable screen layer state monitoring apparatus.
To achieve these goals, the present invention is adopted the following technical scheme that：
It is a kind of based on frequency sweep reflection power measurement cable shield status monitoring device, behind abbreviation detection means,
Including：
There is module in sine wave signal, be configured to DDS technologies and produce the sinusoidal signal of Frequency Adjustable to believe as transmitting
Number source；
Power-adjustable amplification module, is configured as adjusting sine wave swept-frequency signal generation module according to actual conditions demand
Transmission power size；
Reflected signal directional couple receiver module, is configured as the signal that opposite direction is propagated being oriented coupling output,
And the sampled signal being coupled out is input to power measurement module；
The power measurement module, is configured as entering the power of the reflected signal of reflected signal directional couple receiver module
Row measurement and collection；
Impedance matching module, the transformer and build-out resistor for being configured to, with different no-load voltage ratios forms outlet side impedance
Adjustable circuit network, can carry out impedance matching to the cable of different impedance varieties；
The MCU control module, is configured as connection sine wave signal and module, power-adjustable amplification module and joint occurs
Impedance matching module, is scheduled to above-mentioned module, coordinates control, to monitor the state of communication cable shielding layer.
The reflected signal directional couple receiver module includes input port, straight-through port, coupling port and isolation end
Mouthful；
The directional coupler is used for frequency sweep reflected signal of sampling, and frequency sweep transmission signal is as described in the directional coupler
Input port is input into, and the coupling port is used to export sampled signal of the directional coupler to frequency sweep transmission signal, described
Straight-through port is used to export by the frequency sweep transmission signal of the directional coupler, and the isolated port is hanging.
A kind of cable shield condition monitoring system based on the measurement of frequency sweep reflection power, including above-mentioned detection device, number
According to storehouse server and loaded cable；
The database server, is configured as supporting that active control detection means carries out measurement of correlation, receives detection dress
The data of collection are put, and data are carried out with the assessment of comprehensive analysis and cable shield layer state, provide the complete shape of cable shield
There is damaged probability in state index and particular location；
The loaded cable, refers to communication cable to be measured, connects the detection means.
Method based on said apparatus, comprises the following steps
(1) loaded cable and impedance matching module are connected, impedance matching module is adjusted, makes the defeated of detection means
Go out the input resistant matching with loaded cable；
(2) there is the sinusoidal signal of the module a certain fixed frequency of generation in MCU control module control sine wave signal, and be input into
To power-adjustable amplification module；
(3) MCU control module control power-adjustable amplification module adjusts sinusoidal signal to setting power (setting power work
For the transmission power of sinusoidal signal is saved in MCU module), then by reflected signal directional couple receiver module and impedance
Matching module, is coupled in loaded cable；
(4) after sinusoidal signal is coupled in loaded cable, impedance discontinuity between cable shield and heart yearn
Locus can produce reflection；Along original path reverse transfer, by impedance matching module, joint hinders reflected signal
The impedance matching effect of anti-matching module ensure that the normal transmission of signal, effectively prevent signal in the module and impedance mismatching
There are multiple reflections between point (being generally the breaking point of cable shield) or produce stronger concussion, influence measurement knot
Fruit accuracy；
(5) reflected signal continues to be transferred to reflected signal directional couple receiver module, and the module is adopted to reflected signal
Sample and coupling are exported, and again are coupled to power measurement module；
(6) power measurement module measures the power of reflected signal under the control of MCU module, and measurement result is sent
To MCU module；
(7) MCU module is according to the transmission power of sinusoidal signal and the power of the reflected signal for measuring, it is determined that measure next time
Selected sine wave freuqency and transmission power, and repeat step (1)-(7)；When pendulous frequency or swept frequency range reach pre- limiting
Value processed, then terminate the measurement of epicycle frequency sweep reflection power, and perform (8).
(8) all measuring conditions and result are transmitted database server by MCU module；
(9) database server carries out classification preservation to all measuring conditions and result data information, and by big data
Parser and neural network algorithm, are analyzed and assess；
In the step (1), by the sinusoidal signal output end (i.e. the output end of impedance matching module) of detection means
It is connected with the screen layer and any one heart yearn of communication cable, energy coupling is transmitted between screen layer and heart yearn.
In the step (1), butt joint carries out complete radio-frequency joint PROCESS FOR TREATMENT, i.e. communication cable is connected with detection means
When connecing, the space structure between cable shield and heart yearn is tried one's best and keeps constant, after the completion of connection, screen layer is shielded
Treatment, ensures the continuity of cable resistance as far as possible.
In the step (6), after signal is coupled in loaded cable, the impedance between cable shield and heart yearn has
The place of change, can be because impedance mismatch produces reflection, and reflected signal can be transferred to impedance and match along loaded cable
Module, is then communicated to reflected signal directional couple receiver module, is finally delivered to power measurement module, carries out power measurement.
In the step (7), lower threshold value on setting power, when the power for receiving exceedes threshold value, controls power-adjustable
Amplification module reduction or increase transmission power.
In the step (9), the big data parser is related to K-Means algorithms, SVM algorithm, EM algorithm
Deng.
In the step (9), the neural network algorithm refers to artificial neural network algorithm；Artificial neural network algorithm
The characteristics of due to itself information processing, such as concurrency, self study, self-organizing, associative memory and classification feature, can go out
Color solves the problems, such as that traditional mode recognition methods is difficult to satisfactorily resolve.
Beneficial effects of the present invention are：
(1) by implementation of the invention, whether the advantageous information of normal work (is counted can to obtain communication cable shielding layer
According to)；After device installation, the foundation of specific cut cable monitor database and big data are analyzed by database server,
Can be contrasted to the state of database input cable screen layer actual motion during cable maintenance with reference to attendant
And self study, constantly improve cable shield monitor database, the cable fault alarm of final achievable high accuracy and compared with
High-precision cable fault positioning function；
(2) by the use of artificial neural network algorithm, cable shield status monitoring system proposed by the present invention can be made
System (including above-mentioned detection device and method) possesses the ability of autonomous learning and autonomous training, progressively real with constantly study
Now more accurate fault location and cable shield state analysis；In addition, employing artificial neural network algorithm, can make
Cable shield condition monitoring system is stated for Different field environment (including different cable system topological structures, cable system portion
Affix one's name to the environmental factors such as region, weather, the soil on periphery) the autonomous analysis method for training personalization, increased the environment of system
Adaptability.
(3) present apparatus is only acquired to the RMS power datas of reflected signal, to complicated electromagnetic environment adaptability more
By force, device is simple, low cost；Robustness in function and structure is stronger, with more practicality；
(4) the position letter comprising enough cable shield status informations and trouble point in the data that the present apparatus is gathered
Breath, for different cable systems, different types of cable, different cable running environment, the power information of cable reflection signal
Have different embodiments；The mean effective power detection techniques that the present apparatus is used have more practicality；Moreover, with information technology
Development, big data analysis, cloud computing and more high-end information extraction algorithm can help the system gradual perfection cable screens
Cover the monitoring accuracy and sensitivity of layer；
(5) the mean effective power detection techniques antijamming capability that the present apparatus is used has more realistic meaning：It is complicated in environment
Underground piping in, it is easier to realize various protection；And the device is once disposed, it is necessary to high-volume deployment, has more on cost
Advantage；The simple and stability of the present apparatus, can greatly reduce the maintenance cost after device deployment.
Brief description of the drawings
Fig. 1 is apparatus of the present invention hardware composition schematic diagram；
Fig. 2 is the carrying schematic diagram of terminal of the present invention and cable.
Specific embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of detection means of communication cable shielding layer status monitoring, including MCU control module, sine wave
Signal generating module, power-adjustable amplification module, impedance matching module, reflected signal directional couple receiver module and power
Measurement module.
There is module in sine wave signal, using the CMOS whole number frequency synthesizers of Highgrade integration, main composition portion
Point：High-speed DDS module, frequency setting registers, high-speed A/D converter (DAC)；With reference to model：The AD9850 of ADI companies.
Power-adjustable amplification module, is mainly made up of, with reference to model adjustable gain power amplifier and its peripheral circuit：
The ADA4310 of ADI companies；
Impedance matching module, is constituted using matching transformer and its peripheral build-out resistor, electric capacity, inductance original paper.
With transformer basic parameter：Primary side and secondary side no-load voltage ratio 1-16 are adjustable, primary side input impedance in 300Hz-10MHz frequency ranges
It is 50 Ω, transimission power upper limit threshold is 5W；
Reflected signal directional couple receiver module, is constituted using suitable directional coupler, attenuator network.Directional couple
Device basic parameter：Insertion loss<0.5dB, supports frequency range 300K-10MHz, interface impedance：50Ω；
Power measurement module, using conventional rf power measurement chip (such as RMS response wave detectors-ADL5511), essence
Degree is high and supports bandwidth.
Apparatus control method (as shown in Figure 1)：
1. device itself can complete simple closed-loop control；
1) detection means initialization：MCU control module sends upper electricity instruction to sine wave signal generating module, then sends
Original sine wave frequency rate control information, control module enters state to be output；MCU control module is sent out to power-adjustable amplification module
Electric instruction is served, it is minimum multiplication factor then to send initial signal power amplification multiple, and control module enters treats working condition；
MCU control module control joint impedance matching module carries out initial impedance matching and sets；MCU control module controls power measurement mould
Electricity and initialization, feed them into and treat working condition on block；
2) time delay for a period of time, treats after each module running status stabilization of device that MCU module control sine wave signal occurs
Module, power-adjustable amplification module start output, and control power measurement module is started working simultaneously, receive reflected energy and survey
Amount reflection power, sends the result to MCU control module；、
3) power information that MCU control module will be received is analyzed treatment, and carries out following control judgement：Set first
Fixed low and high 2 power thresholds A and B, and A<B, is not reflected by energy and damages and adjust reflected signal in conjunction for protection device
Suitable measured zone；When receiving power is more than B, then MCU control module control power-adjustable amplification module reduces transmission power；When
Receiving power is less than A, then MCU control module control power-adjustable amplification module increase module transmission power；Last MCU controls mould
The data is activation that block will be measured is to database server.
4) there is module adjustment sinusoidal signal frequency in MCU control module control sine wave signal, then repeat (1)-(3) step
Suddenly.
2. device can complete the opened loop control that external hand is input into " database server " module；
1) database server sends the fixed frequency measuring command being manually entered to MCU control module, MCU control module
According to the frequency information in the order, there is the frequency that module adjusts sinusoidal signal in control sine wave signal, then perform control
(2)-(3) step in method 1；
2) database server sends the constant power multiplication factor order being manually entered to MCU control module, MCU controls
Power output multiplication factor information of the module in the order, control power-adjustable amplification module adjusts the power of sinusoidal signal
Multiplication factor, then performs (2)-(3) step in control method 1；
As shown in Fig. 2 detection means carries out matching by impedance matching module and loaded cable being connected, detection means
The differential interface of outlet side is connected with the screen layer of tested cable and any one heart yearn matching respectively；The step is that the present apparatus is entered
The basic and most important operation of row data acquisition, it is necessary to assure the strict matching of joint, will otherwise directly affect device
Power consumption and operation safety, reduce device performance.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (9)
1. it is a kind of based on frequency sweep reflection power measurement cable shield status monitoring device, it is characterized in that：Including：
There is module in sine wave signal, be configured to DDS technologies and produce the sinusoidal signal of Frequency Adjustable as transmiting signal source；
Power-adjustable amplification module, is configured as adjusting the transmitting that sine wave swept-frequency signal occurs module according to actual conditions demand
Watt level；
Reflected signal directional couple receiver module, is configured as the signal that opposite direction is propagated being oriented coupling output, and handle
The sampled signal being coupled out is input to power measurement module；
The power measurement module, is configured as surveying the power of the reflected signal of reflected signal directional couple receiver module
Amount and collection；
Impedance matching module, the transformer and build-out resistor for being configured to, with different no-load voltage ratios forms outlet side impedance adjustable
Circuit network, impedance matching can be carried out to the cable of different impedance varieties；
The MCU control module, is configured as connection sine wave signal and module, power-adjustable amplification module and impedance occurs
Matching module, is scheduled to above-mentioned module, coordinates control, to monitor the state of communication cable shielding layer.
2. the device of a kind of cable shield status monitoring based on the measurement of frequency sweep reflection power as claimed in claim 1, its
It is characterized in：The reflected signal directional couple receiver module includes input port, straight-through port, coupling port and isolation end
Mouthful；
The directional coupler is used to sample frequency sweep reflected signal, frequency sweep transmission signal by the directional coupler the input
Port is input into, and the coupling port is used to export sampled signal of the directional coupler to frequency sweep transmission signal, described straight-through
Port is used to export by the frequency sweep transmission signal of the directional coupler, and the isolated port is hanging.
3. it is a kind of based on frequency sweep reflection power measurement cable shield condition monitoring system, it is characterized in that：Will including such as right
Ask device described in 1 or 2, database server and loaded cable；
The database server, is configured as supporting that active control detection means carries out measurement of correlation, receiving detection device is adopted
The data of collection, and data are carried out with the assessment of comprehensive analysis and cable shield layer state, provide cable shield good working condition and refer to
There is damaged probability in number and particular location；
The loaded cable, refers to communication cable to be measured, connects described device.
4. the method for device as claimed in claim 1 or 2 is based on, it is characterized in that：Comprise the following steps：
(1) loaded cable and impedance matching module are connected, impedance matching module is adjusted, make the output of detection means with
The input resistant matching of loaded cable；
(2) there is module and produce the sinusoidal signal of a certain fixed frequency in MCU control module control sine wave signal, and be input to can
Adjusting power amplification module；
(3) MCU control module control power-adjustable amplification module adjusts sinusoidal signal to setting power, then by reflected signal
Directional couple receiver module and impedance matching module, are coupled in loaded cable；
(4) after sinusoidal signal is coupled in loaded cable, the space of the impedance discontinuity between cable shield and heart yearn
Position can produce reflection；
(5) reflected signal continues to be transferred to reflected signal directional couple receiver module, the module reflected signal is carried out sampling and
Coupling output, and it again is coupled to power measurement module；
(6) power measurement module measures the power of reflected signal under the control of MCU module, and sends the measurements to MCU
Module；
(7) MCU module is according to the transmission power of sinusoidal signal and the power of the reflected signal for measuring, it is determined that measure selected next time
Sine wave freuqency and transmission power, and repeat step (1)-(7)；When pendulous frequency or swept frequency range reach preset limit
Value, then terminate the measurement of epicycle frequency sweep reflection power, and perform (8)；
(8) all measuring conditions and result are transmitted database server by MCU module；
(9) database server carries out classification preservation to all measuring conditions and result data information, and is analyzed by big data
Algorithm and neural network algorithm, are analyzed and assess.
5. method as claimed in claim 4, it is characterized in that：In the step (1), the sinusoidal signal of detection means is exported
End, i.e., the output end of impedance matching module is connected with the screen layer of communication cable and any one heart yearn, by energy coupling
It is transmitted between screen layer and heart yearn.
6. method as claimed in claim 4, it is characterized in that：In the step (1), butt joint carries out complete radio-frequency joint technique
Treatment, i.e., when communication cable is connected with detection means, the space structure between cable shield and heart yearn is tried one's best and keeps constant,
After the completion of connection, shielding processing is carried out to screen layer, the continuity of cable resistance is ensured as far as possible.
7. method as claimed in claim 4, it is characterized in that：In the step (6), after signal is coupled in loaded cable,
The place that impedance between cable shield and heart yearn is changed, can be because impedance mismatch produces reflection, reflected signal meeting
Impedance matching module is transferred to along loaded cable, reflected signal directional couple receiver module is then communicated to, finally passed
It is defeated to power measurement module, carry out power measurement.
8. method as claimed in claim 4, it is characterized in that：In the step (7), lower threshold value on setting power, when receiving
Power when exceeding threshold value, the reduction of control power-adjustable amplification module or increase transmission power.
9. method as claimed in claim 4, it is characterized in that：In the step (9), the big data parser is K-
Means algorithms, SVM algorithm or EM algorithm.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107576879A (en) * | 2017-07-27 | 2018-01-12 | 山东康威通信技术股份有限公司 | Sweep measurement device and the method for estimating cable attribute |
| CN108008196A (en) * | 2017-11-14 | 2018-05-08 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer distal end earth resistance metering device and method |
| CN108107306A (en) * | 2018-01-03 | 2018-06-01 | 国网福建省电力有限公司泉州供电公司 | Intelligent secondary wire core checking device based on high-frequency communication |
| CN109116126A (en) * | 2018-09-06 | 2019-01-01 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer shield effectiveness on-line monitoring appraisal procedure and system |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN109541391A (en) * | 2018-10-10 | 2019-03-29 | 山东康威通信技术股份有限公司 | A kind of low-power consumption cable shield on-Line Monitor Device, monitoring system and method |
| CN110412371A (en) * | 2019-07-20 | 2019-11-05 | 中国船舶重工集团公司第七二四研究所 | Multi-coaxial cable assembly shield effectiveness detection method based on probe method |
| CN114062855A (en) * | 2020-08-05 | 2022-02-18 | 威德大学校产学协力团 | Power cable degradation detection device and method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566665A (en) * | 2009-06-09 | 2009-10-28 | 中国民航大学 | Plane cable fault locator based on time domain reflection |
| CN105388397A (en) * | 2015-12-02 | 2016-03-09 | 山东康威通信技术股份有限公司 | Fault positioning device and method for cable of branch structure |
| CN106405323A (en) * | 2016-08-19 | 2017-02-15 | 山东康威通信技术股份有限公司 | Single port measurement calibration model based cable sweep frequency positioning analyzing system and method |
-
2016
- 2016-11-21 CN CN201611039935.6A patent/CN106841838B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101566665A (en) * | 2009-06-09 | 2009-10-28 | 中国民航大学 | Plane cable fault locator based on time domain reflection |
| CN105388397A (en) * | 2015-12-02 | 2016-03-09 | 山东康威通信技术股份有限公司 | Fault positioning device and method for cable of branch structure |
| CN106405323A (en) * | 2016-08-19 | 2017-02-15 | 山东康威通信技术股份有限公司 | Single port measurement calibration model based cable sweep frequency positioning analyzing system and method |
Cited By (11)
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| CN107576879A (en) * | 2017-07-27 | 2018-01-12 | 山东康威通信技术股份有限公司 | Sweep measurement device and the method for estimating cable attribute |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN108008196A (en) * | 2017-11-14 | 2018-05-08 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer distal end earth resistance metering device and method |
| CN108008196B (en) * | 2017-11-14 | 2020-07-28 | 山东康威通信技术股份有限公司 | Device and method for measuring far-end grounding resistance of shielding layer of communication cable |
| CN108107306A (en) * | 2018-01-03 | 2018-06-01 | 国网福建省电力有限公司泉州供电公司 | Intelligent secondary wire core checking device based on high-frequency communication |
| CN108107306B (en) * | 2018-01-03 | 2024-03-15 | 国网福建省电力有限公司泉州供电公司 | Intelligent secondary wire core checking device based on high-frequency communication |
| CN109116126A (en) * | 2018-09-06 | 2019-01-01 | 山东康威通信技术股份有限公司 | A kind of communication cable shielding layer shield effectiveness on-line monitoring appraisal procedure and system |
| CN109541391A (en) * | 2018-10-10 | 2019-03-29 | 山东康威通信技术股份有限公司 | A kind of low-power consumption cable shield on-Line Monitor Device, monitoring system and method |
| CN110412371A (en) * | 2019-07-20 | 2019-11-05 | 中国船舶重工集团公司第七二四研究所 | Multi-coaxial cable assembly shield effectiveness detection method based on probe method |
| CN114062855A (en) * | 2020-08-05 | 2022-02-18 | 威德大学校产学协力团 | Power cable degradation detection device and method thereof |
| CN114062855B (en) * | 2020-08-05 | 2024-04-12 | 威德大学校产学协力团 | Power cable degradation detection device and method thereof |
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