CN106771882A - The offline inspection localization method and device of a kind of high-tension cable potential problems - Google Patents
The offline inspection localization method and device of a kind of high-tension cable potential problems Download PDFInfo
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- CN106771882A CN106771882A CN201710051022.4A CN201710051022A CN106771882A CN 106771882 A CN106771882 A CN 106771882A CN 201710051022 A CN201710051022 A CN 201710051022A CN 106771882 A CN106771882 A CN 106771882A
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- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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Abstract
The invention discloses the offline inspection localization method and device of a kind of high-tension cable potential problems, device includes：Single-chip microcomputer, signal generating module, signal amplification module, transformer, calibration detection module, sampling trigger signal module, cable under test, echo detecting circuit, data acquisition module, Data Analysis Services module and light-coupled isolation module, single-chip microcomputer, signal generating module, signal amplification module and transformer are sequentially connected；Transformer includes primary side and first and second primary side, and primary side is connected with signal amplification module, calibration detection module；First primary side and cable connection, cable are connected with echo detecting circuit, and echo detecting circuit, data acquisition module, Data Analysis Services module and light-coupled isolation module are sequentially connected, and light-coupled isolation module is connected to single-chip microcomputer；Second subprime side is connected with sampling trigger signal module, and sampling trigger signal module is connected with Data Analysis Services module；Light-coupled isolation module is located between single-chip microcomputer and Data Analysis Services module.
Description
Technical field
It is latent the present invention relates to cable detection field, more particularly to a kind of high-tension cable of based on traveling wave method, safe and convenient
In the offline inspection localization method and device of problem.
Background technology
In recent years, domestic and international power network development is rapid, and power cable is largely put among the construction of urban distribution network, and is used
Amount rises year by year.As the continuous growth of power network power load, cable fault rate are also raised significantly, heavy economic losses is caused.
To ensure the reliability service of power cable, power grid security is ensured, the detection technique to cable becomes the research of domestic and international expert
Focus.At present, it is to the detection mode that high-tension cable is commonly used：Periodically have a power failure before putting into operation or to operating high-tension cable,
Carry out offline inspection.
Currently, pulse current method in the off-line checking method of power cable is used relatively broad.Its general principle be with
Exchange experimental power supply is forced into the grade of certain voltage to cable, and the fault location of cable insulation can occur shelf depreciation, cable two
End can produce an instantaneous voltage change, now through overcoupled circuits, pulse current be produced in the loop, by pulse current stream
The pulse voltage that impedance is produced after testing gathered, amplify and display processing determines the fundamental quantity of shelf depreciation.Positioning is then
It is to be calculated using pulse forward and reverse time difference for propagating generation.But cable is carried out charging measurement need voltage very high and
Time is more long, the charging system include multiple equipment, such as in the wild detect when need generator, high-tension transformer, coupled capacitor and
High pressure connection cable.Equipment conveying inconvenience, is unfavorable for the offline inspection under field condition simultaneously.And the pulse produced by method
Actual is damped oscillation, for latent defect point away from test point it is nearer when, because pulse propagation path is too short so that reflected impulse
There is aliasing with incident pulse, be difficult observation and cannot accurately obtain the time difference between incident and reflected impulse, cause fixed
Position failure.And the method calculates the time difference by observation oscilloscope, error is very big, as a result very inaccurate.
Wave of oscillation method replaces the conventional AC experimental power supply in pulse current method by passive resonance technology so that system body
Product and weight are substantially reduced.DC charging is being used and on the basis of charging complete to cable, by built-in high pressure reactance
Solid-state switch and test product cable form damped oscillation voltage wave when device, high-pressure solid, inspire the electric discharge letter at cable latent defect
Number.Because its general principle is roughly the same with pulse current method, thus equally exist to latent defect point away from test point it is nearer when
It is unable to the problem of precise positioning.And still need to carry the equipment such as oscillograph to observe discharge signal and record data, more bother.
And the above method all needs to carry out high-voltage charging, there is potential safety hazard to operating personnel, and can be to the cable of existing discharge source
Secondary damage is caused, the infringement to cable is larger.
Based on problems described above, it is fixed that a kind of offline inspection of the high-tension cable potential problems of safe and convenient is badly in need of in this area
Position method and device.
The content of the invention
In order to overcome the defect of prior art, the present invention to provide a kind of high-tension cable of based on traveling wave method, safe and convenient
The offline inspection localization method and device of potential problems.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：
A kind of offline inspection localization method of high-tension cable potential problems, comprises the following steps：
1) sinusoidal signal for detecting cable under test is produced by Single-chip Controlling DDS signal generator；
2) sinusoidal signal carries out the amplification of signal through signal amplification module；
3) sinusoidal signal after amplifying is by transformer coupled to the echo detecting circuit for being connected to cable under test；
4) sampling of voltage is carried out in the test side of the echo detecting circuit by data acquisition module；
5) Wave data that sampling is obtained is read by Data Analysis Services module, and is analyzed and processes；
6) intact cable detected, sampled, the data of the waveform B for obtaining of sampling are stored in Data Analysis Services mould
In the memory cell of block；
7) the Data Analysis Services module should obtain data below before Data Analysis Services are carried out to sampled signal：
A) spread speed v of the sinusoidal signal in the cable under test；
B) the frequency f and cycle T of the sinusoidal signal.
8) the Data Analysis Services module needs to complete in treatment：
When a) being detected to cable under test, the data of the waveform A in two cycles obtained in test point sampling；
B) data of the data of the waveform A obtained by detection cable under test and the waveform B obtained to intact cable detection it
Difference, obtains two data of periodic waveform C that the sinusoidal signal reaches problem points and reflects；
C) the abscissa t of the maximum point of waveform CiWith traveling wave to potential problems point again it is reflected return the time used
ΔtiRelational expression be：
D) each problem points utilizes formula away from test point apart from x：
X=v Δs ti/2
Calculate；
9) when detection contains the cable under test of potential problems, single-chip microcomputer gathers the peak value of transformer primary voltage, then will
This peak value is compared with the respective value left when detecting intact cable, and Data Analysis Services module, institute are given by gained ratio
Data Analysis Services module is stated by the sampled value of current cable under test divided by this ratio, to eliminate the aging of circuit, humidity and temperature
Spend the influence to measuring.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, also including step：The Data Analysis Services module is being shown through the result that analyzing and processing is obtained
Shown in module.
Further, the sinusoidal signal includes through the amplification that signal amplification module carries out signal：First through voltage amplifier
The amplification of voltage is carried out, then the amplification of power is carried out through power amplifier.
Due to that containing the potential problems possible more than one potential problems point of tested cable, can there are multiple back waves, in test
After point superposition, waveform C more than just one maximum points in a cycle might have multiple maximum points, i-th maximum
The abscissa of point is ti, and each potential problems point still can be by formula x=v Δs t apart from x away from test leadi/ 2 calculate
Come.
In actual applications, the frequency f of sinusoidal signal should be fixed, and f should be much smaller than the intrinsic of echo detecting circuit
Resonant frequency f0；Usually, optional f=50kHz.
Sinusoidal signal is the Propagation between the plain conductor and metallic shield net of the cable containing potential problems,
During by potential problems point, waveform can be reflected, and the mutation of Π phases is had during reflection；The final Wave data that samples is
Signal waveform data after being superimposed with each back wave through transformer coupled signal.
The present invention also provides a kind of offline inspection positioner of high-tension cable potential problems, including：Single-chip microcomputer, signal hair
Raw module, signal amplification module, transformer, calibration detection module, sampling trigger signal module, cable under test, echo detecting electricity
Road, data acquisition module, Data Analysis Services module and light-coupled isolation module, wherein, it is provided with the signal generating module
The DDS signal generator of the single-chip microcomputer is connected to, DDS signal generator described in the Single-chip Controlling produces sinusoidal signal；
The DDS signal generator is connected through resistance R1 with the signal amplification module, and the signal amplification module is connected to described
Transformer；The transformer includes：Transformer primary, the primary side of transformer first and transformer second subprime side, wherein,
The transformer primary is connected with the signal amplification module, the transformer primary also with the calibration detection module
It is connected；The primary side of the transformer first is connected with the cable under test, and the cable under test and the echo detecting are electric
Road is connected, the echo detecting circuit, the data acquisition module, the Data Analysis Services module and the light-coupled isolation
Module is sequentially connected and connects, and the light-coupled isolation module is connected to the single-chip microcomputer；Adopted with described the transformer second subprime side
Sample trigger signal module is connected, and the sampling trigger signal module is connected with the Data Analysis Services module；The light
Coupling isolation module is located between the single-chip microcomputer and the Data Analysis Services module.
On the basis of above-mentioned technical proposal, the present invention can also do following improvement.
Further, also it is used to show the data including being connected to the display module of the Data Analysis Services module
Waveform and calculated value that analysis and processing module sampling is obtained.
Further, voltage amplifier and power amplifier are sequentially provided with the signal amplification module；The voltage is put
The positive input terminal of big device is connected with the resistance R1, and negative input end is grounded through resistance R2, the negative input of the voltage amplifier
Resistance R3 in parallel between end and output end；The output end phase of the positive input terminal of the power amplifier and the voltage amplifier
Connection, the negative input end of the power amplifier exports terminal shortcircuit with it, and output end is connected to the transformer.
Further, the calibration detection module includes：Resistance R6, R7 and R8, detection operational amplifier and detection electricity
Road, is parallel to the transformer primary, the resistance R7 ground connection, the detection operation amplifier after the resistance R6 and R7 series connection
The positive input terminal of device is connected between described resistance R6, R7 by resistance R8, the negative input end of the detection operational amplifier with
Its output terminal shortcircuit is simultaneously connected to the detecting circuit, and the detecting circuit is connected to the single-chip microcomputer.
Further, the echo detecting circuit includes：Inductance L1, electric capacity C1, resistance R4 and R5, the first secondary operational are put
Big device and first time level difference amplifier, the inductance L1 and electric capacity C1 are parallel to first level of the transformer respectively
Side, the primary side of the transformer first is parallel to after the resistance R4 and R5 series connection, and first level operational amplifier is just
Input is connected between described resistance R4, R5, and the negative input end of first level operational amplifier exports terminal shortcircuit with it,
The first time level difference amplifier is single ended input, both-end output, and its positive input terminal connects first level operation amplifier
The output end of device, both-end is exported to the data acquisition module.
Further, the sampling trigger signal module includes：Second subprime difference amplifier, resistance R9~R12, germanium two
Pole pipe and voltage comparator, the positive and negative input of the second subprime difference amplifier are connected to the transformer second
Level side, output end is connected to the positive input terminal of the voltage comparator by resistance R9, R10 for connecting, the germanium diode
Negative terminal is connected between described resistance R9, R10, described resistance R11, R12 be respectively connecting to the voltage comparator just,
Negative input end, the output end of the voltage comparator is connected to the Data Analysis Services module.
The beneficial effects of the invention are as follows：Can be used in high-tension cable factory, to the high pressure of high-tension cable factory production
Cable is detected that the cable of anti-stop-band potential problems is put into the middle of actually used, causes heavy economic losses；Also can be used for
The investigation of high-tension cable problem, each section of high-tension cable to just having laid detects, the Wave data obtained by detection is preserved
Get up, as reference waveform；If going wrong in use, then each section of high-tension cable is detected, by with each section
Reference waveform is contrasted, and finds out the place of problem.
Brief description of the drawings
Fig. 1 is shown as the system construction drawing of the offline inspection positioner of high-tension cable potential problems of the invention；
Fig. 2 is shown as the circuit block diagram of the detection of high-tension cable potential problems and positioning in one embodiment；
Fig. 3 is shown as three kinds of oscillograms obtained by emulation；
In the accompanying drawings, the list of designations represented by each label is as follows：
100th, single-chip microcomputer；200th, signal generating module；300th, signal amplification module；301st, voltage amplifier；302nd, power
Amplifier；400th, transformer；401st, transformer primary；4011st, detection module is calibrated；402nd, the primary side of transformer first；
403rd, transformer second subprime side；4031st, sampling trigger signal module；500th, cable under test；600th, echo detecting circuit；700、
Data acquisition module；800th, Data Analysis Services module；801st, display module；900th, light-coupled isolation module；
1-2, DDS signal generator；1-6, second subprime difference amplifier；1-7, first time level difference amplifier；1-8、
Voltage comparator；1-13, detection operational amplifier；1-14, first level operational amplifier；1-18, detecting circuit.
Specific embodiment
Principle of the invention and feature are described below in conjunction with accompanying drawing, example is served only for explaining the present invention, and
It is non-for limiting the scope of the present invention.
Incorporated by reference to shown in Fig. 1 and Fig. 2, Fig. 1 is shown as the offline inspection positioner of high-tension cable potential problems of the invention
System construction drawing, Fig. 2 be shown as in one embodiment high-tension cable potential problems detection positioning circuit block diagram；It is described offline
Detection positioner includes：Single-chip microcomputer 100, signal generating module 200, signal amplification module 300, transformer 400, calibration detection
Module 4011, sampling trigger signal module 4031, cable under test 500, echo detecting circuit 600, data acquisition module 700, number
According to analysis and processing module 800, display module 801, light-coupled isolation module 900, wherein,
The DDS signal generator 1-2 for being connected to the single-chip microcomputer 100, the list are provided with the signal generating module 200
Piece machine 100 controls the DDS signal generator 1-2 to produce the sinusoidal signal for detecting the high-tension cable containing potential problem；Institute
Stating single-chip microcomputer 100 can use AD9851, the monolithic using STC12C5A60S2 single-chip microcomputers, the DDS signal generator 1-2
It is described that machine 100 exports the DDS signal generator 1-2 by writing control word command to the DDS signal generator 1-2
Sinusoidal signal, can make the frequency of the sinusoidal signal change by the control word for changing write-in.
The DDS signal generator 1-2 is connected through resistance R1 with the signal amplification module 300；The signal amplifies
Voltage amplifier 301 and power amplifier 302 are sequentially provided with module 300；The positive input terminal of the voltage amplifier 301 and institute
State resistance R1 to be connected, negative input end is grounded through resistance R2, between the negative input end and output end of the voltage amplifier 301 simultaneously
Join a resistance R3；The positive input terminal of the power amplifier 302 is connected with the output end of the voltage amplifier 301, described
The negative input end of power amplifier 302 exports terminal shortcircuit with it；Thus, the sinusoidal signal that the DDS signal generator 1-2 is produced
After voltage amplifier carries out voltage amplification, then power amplification is carried out by power amplifier；Wherein, voltage amplifier 301
LMH6629 is can select, power supply voltage can reach ± 15V, its function is the institute for exporting the DDS signal generator 1-2
State sinusoidal signal to be amplified so that the voltage swing of sinusoidal signal meets requirement；In actual applications, can be by setting resistance
The resistance of R2 and R3 adjusts the multiplication factor of voltage；And power amplifier 302 can select OPA2604, output current can reach
350mA, effect is that the sinusoidal signal from voltage amplifier 301 is carried out into power amplification so that this signal can meet echo inspection
The need for slowdown monitoring circuit power.
The output end of the power amplifier 302 is connected to the transformer 400, and the transformer 400 includes：Transformer
Primary side 401, the first primary side of transformer 402 and transformer second subprime side 403, wherein,
The first end of the transformer primary 401 is connected with the output end of the power amplifier 302, the transformation
Second end of device primary side 401 is directly grounded；
The transformer primary 401 is connected with the calibration detection module 4011, and the calibration detection module 4011 is wrapped
Include：It is in parallel after resistance R6, R7 and R8, detection operational amplifier 1-13 and detecting circuit 1-18, the resistance R6 and R7 series connection
In the transformer primary, the resistance R7 ground connection, the positive input terminal of the detection operational amplifier 1-13 passes through resistance R8
It is connected between described resistance R6, R7, the negative input end of the detection operational amplifier 1-13 exports terminal shortcircuit and is connected with it
To the detecting circuit 1-18, the detecting circuit 1-18 is connected to the single-chip microcomputer 100；
Due to the influence of temperature etc., the parameter of device can occur minor variations, it is necessary to calibrate；The primary side parallel connection two of transformer
Individual big resistance R6, R7, the presence of which will not produce any influence to measurement；When intact cable is detected, resistance R7 is taken out
The voltage signal at two ends, the voltage follower being made up of resistance R8, operational amplifier 1-13, by after detecting circuit 1-18,
The peak value of voltage is obtained, the A/D conversion mouths of single-chip microcomputer 100 are sent to, digital quantity is converted into, this digital quantity is saved in single-chip microcomputer
In memory；
Equally when the cable of potential problems is contained described in detection, single-chip microcomputer should also record the voltage letter of self-resistance R7
Number peak value, then this peak value is compared with the respective value left when detecting intact cable, by gained ratio by optocoupler every
From the Data Analysis Services module 800 is given, the Data Analysis Services module 800 will currently contain the cable of potential problems
Sampled value can thus eliminate the influence to measuring such as temperature divided by this ratio.
The first primary side of the transformer 402 is connected with the cable under test 500, the cable under test 500 with it is described
Echo detecting circuit 600 is connected, the echo detecting circuit 600, the data acquisition module 700, at the data analysis
Reason module 800 and the light-coupled isolation module 900 are sequentially connected and connect, and the light-coupled isolation module 900 is connected to the single-chip microcomputer
100；Wherein,
The echo detecting circuit 600 includes：Inductance L1, electric capacity C1, resistance R4 and R5, first level operational amplifier
1-14 and first time level difference amplifier 1-7, the inductance L1 and the electric capacity C1 are parallel to the transformer first respectively
Primary side, the primary side of the transformer first, first level operational amplifier are parallel to after the resistance R4 and R5 series connection
The positive input terminal of 1-14 is connected between described resistance R4, R5, the negative input end of first level operational amplifier 1-14 with
Its output terminal shortcircuit, the first time level difference amplifier 1-7 is single ended input, both-end output, and the connection of its positive input terminal is described
First output end of level operational amplifier 1-14, both-end is exported to the data acquisition module 700；
In the echo detecting circuit 600, the inductance L1 and electric capacity C1 enables to the sine for detecting
The waveform of signal is the intact sine wave of a comparing；Resistance R4 and R5 are sufficiently large resistance, and the presence of which is not interfered with
Detection, for example, resistance R4 is chosen as 100 megaohms, resistance R5 is chosen as 100 kilo-ohms；The transformer 400 is coupled to the electricity of secondary
The amplitude of pressure can be more than 50V；The effect of the echo detecting circuit 600 is：Sinusoidal signal after amplifying through power amplifier
Cable under test test side is coupled to, and traveling wave is produced in cable under test, so that data acquisition module is sampled；
First level operational amplifier 1-14 can select LM709, and the first time level difference amplifier 1-7 can select
AD8132；First level operational amplifier 1-14 is followed to the voltage on resistance R5 both sides, the first time level difference
Amplifier 1-7 carries out differential amplification to the voltage signal that first level operational amplifier 1-14 is exported, for the data
Acquisition module 700 is sampled；The supply voltage that the first time level difference amplifier 1-7 powers is unsuitable too high, because the data
The input voltage of acquisition module 700 is smaller, for example, the supply voltage of AD8132 is 2.7V；
High speed analog (A/D) conversion chip is provided with the data acquisition module 700, for example, can select ADC08D1000,
Signal to the output of first time level difference amplifier 1-7 under the control of the Data Analysis Services module 800 is adopted
Sample.
The transformer second subprime side 403 is connected with the sampling trigger signal module 4031, the sampling triggering letter
Number module 4031 includes：Second subprime difference amplifier 1-6, resistance R9~R12, germanium diode 1-20 and voltage comparator
1-8, wherein, the positive and negative input of the second subprime difference amplifier 1-6 is connected to the transformer second subprime side, defeated
Go out the positive input terminal that end is connected to the voltage comparator 1-8 by resistance R9, R10 for connecting, the germanium diode 1-20's
Negative terminal is connected between described resistance R9, R10, and described resistance R11, R12 are respectively connecting to the voltage comparator 1-8's
Positive and negative input, the output end of the voltage comparator 1-8 is connected to the Data Analysis Services module 800；
The voltage comparator 1-8 can use LM119, and the sampling trigger signal module 4031 is from the transformer second
Sampling trigger signal is extracted at the two ends of primary side 403, is delivered to the Data Analysis Services module 800；The second subprime difference
Voltage from the transformer second subprime side is carried out differential amplification, the effect of the germanium diode 1-20 by amplifier 1-6
The upper terminal voltage that makes the negative half period of difference amplifier output signal in order to protect the amplifier of back in germanium diode not less than-
0.2V, so as to protect voltage comparator 1-8；Voltage comparator is powered for single supply, and at power supply and the data analysis
As reason module 800；When second subprime difference amplifier 1-6 output levels are higher than 0V, voltage comparator 1-8 outputs electricity high
Flat, when second subprime difference amplifier 1-6 output levels are less than or equal to 0V, thus voltage comparator 1-8 output 0V, are
The Data Analysis Services module 800 provides sampling trigger signal.
Because the load of two primary sides of transformer is different, so phase is incomplete same, should be with for the first time during measurement
The zero crossing of level side is defined；When intact cable is detected, this small time difference should be recorded, be preserved；In reality
When measurement contains the cable of potential risk, it should when the sampling trigger signal from voltage comparator 1-8 outputs is connected to, subtract this
Time difference, it is used as real sampling trigger signal.
The method sampled to test point is as follows：By taking f=50kHz as an example, a cycle is 20uS；In order to improve sampling
Accuracy, by two cycle average samples, 1000 points；The interval of two neighboring coordinate points is 40nS, and sampling process is as follows：
This 1000 points are divided into the sampling of 10 wheels, and each round sample start times are provided by voltage comparator 1-8.First round sampling 1,
11st, 21 ... 991 this 100 points, the second wheel re-sampling 2,12,22,32 ... 992 this 100 points, by that analogy, until
Sample the 10th, 20,30 ... 1000 points.In this process, this 1000 points are all once sampled.Repeat
This process 1024 times, the data that each point is obtained when each process is sampled are added.In reality to the electricity containing potential problems
When cable is detected, in storage to the memory of the Data Analysis Services module 800, obtained when initially to intact cable detection
Data also store.
DSP is provided with the Data Analysis Services module 800, for example can be using TMS320F28 systems
Columns word signal processor；The Data Analysis Services module 800 needs to control the data acquisition module 700 to be sampled,
Start the moment with end, time interval of sampling etc. including sampling；After receiving sampled signal, this sampled signal is divided
Analysis, calculates the position of potential problems point；When the Data Analysis Services module 800 is received from voltage comparator 1-8's
During sampling trigger signal, the test lead of 700 pairs of cable under test 500 of data acquisition module is controlled to sample, by institute
Data are obtained to store；
Fig. 3 is three kinds of oscillograms obtained by emulation；Wherein, A ends of wireline test containing potential problems described in detection are sampled
The waveform for arriving, B is the waveform that test lead sampling is obtained when detecting intact cable, and C is that the amplitude of A waveforms each coordinate points of correspondence is subtracted
Obtained by the amplitude of each coordinate points of B waveforms correspondence, the signal reflected during equivalent to sine wave by potential problems point
Waveform；The abscissa ti of the maximum point of waveform C and traveling wave to potential problems point are returned time Δ used after reflection again
The relation of ti is：Each problem points is calculated apart from x away from test point using x=v Δs ti/2.
Additionally, the Data Analysis Services module 800 is also associated with the display module 801, it is used to show the data
Waveform and calculated value that the sampling of analysis and processing module 800 is obtained, by the waveform of sampled signal, the ripple to the sampling of intact cable
Shape, potential problems point reflection are returned waveform these three waveforms comparatively show, and by the position display of potential problems point
Out.
In offline inspection positioner of the invention, due to the single-chip microcomputer 100 and the Data Analysis Services module
800 power supply difference by optocoupler, it is necessary to be realized between the single-chip microcomputer 100 and the Data Analysis Services module 800
Communication, therefore, the light-coupled isolation module 900 is provided between.
Thus, the sinusoidal signal produced by signal generating module for detecting of the invention, through voltage amplification module and work(
After rate amplification module carries out voltage and power amplification to the sinusoidal signal, this signal is coupled to by detection circuit by transformer；
After signal sampling by Data Analysis Services module control data acquisition module to cable detection end to be measured, then read the data
The data that acquisition module is collected, and treatment is analyzed to this data, the waveform and potential problems point for obtaining will be analyzed and processed
Position shown by display module.
The present invention can be used in high-tension cable factory, and the high-tension cable to the production of high-tension cable factory is examined
Survey, the cable of anti-stop-band potential problems is put into the middle of actually used, causes heavy economic losses.
The present invention also can be used for the investigation of high-tension cable problem.Each section of high-tension cable to just having laid is detected, incited somebody to action
Wave data obtained by detection is saved, used as reference waveform.After being gone wrong during use, then to each section of high-tension electricity
Cable detected, by with each segment standard comparison of wave shape, find out the place of problem.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (9)
1. a kind of offline inspection localization method of high-tension cable potential problems, it is characterised in that comprise the following steps：
1) sinusoidal signal for detecting cable under test is produced by Single-chip Controlling DDS signal generator；
2) sinusoidal signal carries out the amplification of signal through signal amplification module；
3) sinusoidal signal after amplifying is by transformer coupled to the echo detecting circuit for being connected to cable under test；
4) sampling of voltage is carried out in the test side of the echo detecting circuit by data acquisition module；
5) Wave data that sampling is obtained is read by Data Analysis Services module, and is analyzed and processes；
6) intact cable detected, sampled, the data of the waveform B for obtaining of sampling are stored in Data Analysis Services module
In memory cell；
7) the Data Analysis Services module should obtain data below before Data Analysis Services are carried out to sampled signal：
A) spread speed v of the sinusoidal signal in the cable under test；
B) the frequency f and cycle T of the sinusoidal signal；
8) the Data Analysis Services module needs to complete in treatment：
When a) being detected to cable under test, the data of the waveform A in two cycles obtained in test point sampling；
B) difference of the data of the data of the waveform A obtained by detection cable under test and the waveform B obtained to intact cable detection, obtains
Two data of periodic waveform C for reaching problem points to the sinusoidal signal and reflecting；
C) the abscissa t of the maximum point of waveform CiWith traveling wave to potential problems point again it is reflected return time Δ t usedi
Relational expression be：
D) each problem points utilizes formula away from test point apart from x：
X=v Δs ti/2
Calculate；
9) in detection during cable under test containing potential problems, single-chip microcomputer gathers the peak value of transformer primary voltage, then by this peak
Value is compared with the respective value left when detecting intact cable, and Data Analysis Services module, the number are given by gained ratio
According to analysis and processing module by the sampled value of current cable under test divided by this ratio, to eliminate the aging of circuit, humidity and temperature pair
The influence of measurement.
2. offline inspection localization method according to claim 1, it is characterised in that also including step：By the data point
Analysis processing module shows through the result that analyzing and processing is obtained on display module.
3. offline inspection localization method according to claim 1 and 2, it is characterised in that the sinusoidal signal is put through signal
The amplification that big module carries out signal includes：The amplification of voltage is first carried out through voltage amplifier, then power is carried out through power amplifier
Amplification.
4. a kind of offline inspection positioner of high-tension cable potential problems, it is characterised in that including：Single-chip microcomputer, signal occur
Module, signal amplification module, transformer, calibration detection module, sampling trigger signal module, cable under test, echo detecting circuit,
Data acquisition module, Data Analysis Services module and light-coupled isolation module, wherein,
The DDS signal generator for being connected to the single-chip microcomputer is provided with the signal generating module, described in the Single-chip Controlling
DDS signal generator produces sinusoidal signal；
The DDS signal generator is connected through resistance R1 with the signal amplification module, and the signal amplification module is connected to
The transformer；
The transformer includes：Transformer primary, the primary side of transformer first and transformer second subprime side, wherein,
The transformer primary is connected with the signal amplification module, and the transformer primary is also detected with the calibration
Module is connected；
The primary side of the transformer first is connected with the cable under test, the cable under test and the echo detecting circuit phase
Connection, the echo detecting circuit, the data acquisition module, the Data Analysis Services module and the light-coupled isolation module
It is sequentially connected and connects, the light-coupled isolation module is connected to the single-chip microcomputer；
The transformer second subprime side is connected with the sampling trigger signal module, the sampling trigger signal module and institute
Data Analysis Services module is stated to be connected；
The light-coupled isolation module is located between the single-chip microcomputer and the Data Analysis Services module.
5. offline inspection positioner according to claim 4, it is characterised in that also including being connected to the data analysis
The display module of processing module, is used to show the waveform and calculated value that the Data Analysis Services module samples are obtained.
6. the offline inspection positioner according to claim 4 or 5, it is characterised in that in the signal amplification module according to
It is secondary to be provided with voltage amplifier and power amplifier；The positive input terminal of the voltage amplifier is connected with the resistance R1, bears defeated
Enter end to be grounded through resistance R2, resistance R3 in parallel between the negative input end and output end of the voltage amplifier；The power is put
The positive input terminal of big device is connected with the output end of the voltage amplifier, and the negative input end of the power amplifier is exported with it
Terminal shortcircuit, output end is connected to the transformer.
7. the offline inspection positioner according to claim 4 or 5, it is characterised in that the calibration detection module includes：
Resistance R6, R7 and R8, detection operational amplifier and detecting circuit, the transformer is parallel to after the resistance R6 and R7 series connection
Primary side, resistance R7 ground connection, the positive input terminal of the detection operational amplifier by resistance R8 be connected to the resistance R6,
Between R7, the negative input end of the detection operational amplifier exports terminal shortcircuit and is connected to the detecting circuit with it, the inspection
Wave circuit is connected to the single-chip microcomputer.
8. the offline inspection positioner according to claim 4 or 5, it is characterised in that the echo detecting circuit includes：
Inductance L1, electric capacity C1, resistance R4 and R5, first level operational amplifier and first time level difference amplifier, the inductance L1
The primary side of the transformer first is parallel to respectively with the electric capacity C1, and the transformation is parallel to after the resistance R4 and R5 series connection
The primary side of device first, the positive input terminal of first level operational amplifier is connected between described resistance R4, R5, and described first
The negative input end of secondary operational amplifier exports terminal shortcircuit with it, and the first time level difference amplifier is single ended input, both-end
Output, its positive input terminal connects the output end of first level operational amplifier, and both-end is exported to the data acquisition module.
9. the offline inspection positioner according to claim 4 or 5, it is characterised in that the sampling trigger signal module
Including：Second subprime difference amplifier, resistance R9~R12, germanium diode and voltage comparator, the second subprime difference
The positive and negative input of amplifier is connected to the transformer second subprime side, and output end is connected by resistance R9, the R10 for connecting
To the positive input terminal of the voltage comparator, the negative terminal of the germanium diode is connected between described resistance R9, R10, institute
State the positive and negative input that resistance R11, R12 are respectively connecting to the voltage comparator, the output end connection of the voltage comparator
To the Data Analysis Services module.
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| CN201710051022.4A CN106771882B (en) | 2017-01-23 | 2017-01-23 | Off-line detection positioning method and device for potential problems of high-voltage cable |
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| CN106771882B CN106771882B (en) | 2023-09-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061843A (en) * | 2017-12-27 | 2018-05-22 | 温岭市创嘉信息科技有限公司 | A kind of equipment for Cable Fault Location |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2543072Y (en) * | 2002-04-05 | 2003-04-02 | 河源市雅达电子有限公司 | Wire breakage monitor |
| JP2010237127A (en) * | 2009-03-31 | 2010-10-21 | Nichiyu Giken Kogyo Co Ltd | Apparatus and method for detecting ground-fault |
| US20110194418A1 (en) * | 2010-02-05 | 2011-08-11 | Comcast Cable Communications, Llc | Identification of a fault |
| CN104977504A (en) * | 2015-06-19 | 2015-10-14 | 山东航天电子技术研究所 | Cable fault on-line detecting and positioning device |
| CN206420992U (en) * | 2017-01-23 | 2017-08-18 | 鲁东大学 | A kind of offline inspection positioner of high-tension cable potential problems |
| CN112858838A (en) * | 2021-01-22 | 2021-05-28 | 广东电网有限责任公司 | Cable fault positioning system and method |
-
2017
- 2017-01-23 CN CN201710051022.4A patent/CN106771882B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2543072Y (en) * | 2002-04-05 | 2003-04-02 | 河源市雅达电子有限公司 | Wire breakage monitor |
| JP2010237127A (en) * | 2009-03-31 | 2010-10-21 | Nichiyu Giken Kogyo Co Ltd | Apparatus and method for detecting ground-fault |
| US20110194418A1 (en) * | 2010-02-05 | 2011-08-11 | Comcast Cable Communications, Llc | Identification of a fault |
| CN104977504A (en) * | 2015-06-19 | 2015-10-14 | 山东航天电子技术研究所 | Cable fault on-line detecting and positioning device |
| CN206420992U (en) * | 2017-01-23 | 2017-08-18 | 鲁东大学 | A kind of offline inspection positioner of high-tension cable potential problems |
| CN112858838A (en) * | 2021-01-22 | 2021-05-28 | 广东电网有限责任公司 | Cable fault positioning system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061843A (en) * | 2017-12-27 | 2018-05-22 | 温岭市创嘉信息科技有限公司 | A kind of equipment for Cable Fault Location |
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| CN106771882B (en) | 2023-09-12 |
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