CN109406903A - A kind of cable connector water inlet defects detection and diagnostic method - Google Patents
A kind of cable connector water inlet defects detection and diagnostic method Download PDFInfo
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- CN109406903A CN109406903A CN201811456647.XA CN201811456647A CN109406903A CN 109406903 A CN109406903 A CN 109406903A CN 201811456647 A CN201811456647 A CN 201811456647A CN 109406903 A CN109406903 A CN 109406903A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
Abstract
The present invention relates to a kind of cable connector water inlet defects detection and diagnostic methods, comprising the following steps: (1) injects the pulse signal with steep rising edge in the cable；(2) injected pulse of initial and end end and its response signal waveform are observed；(3) compare the characteristic impedance of four parts in cable: connector proximal end cable characteristic impedance Z1, joint characteristics impedance Z2, connector distal end cable characteristic impedance Z3, cable end piece characteristic impedance Z4.The present invention is injected using low-voltage high-frequency time domain impulse, tail end increases pulsed high-frequency impulse source and synchronizes amplification to the signal for being transmitted to tail end, by comparing head end injected pulse waveform, the characteristic similarity or diversity of head end reflected impulse and end injection and reflected pulse waveform judge crosslinked cable connector water inlet state, the offline diagnostic test of existing cable route, which can be made up, directly to be detected, the shortcomings that diagnosing cable connector is with the presence or absence of water inlet and water inlet degree, overcoming simultaneously leads to problem of signal attenuation because route is too long, realize the detection and diagnosis to cable connector water inlet state.
Description
Technical field
The present invention relates to high-voltage technologies and Insulation test field, and in particular to a kind of cable connector water inlet defects detection with
Diagnostic method.
Background technique
Currently, there are no the Method means of effective detection tabs water inlet defect state in cable field test, it can only be to electricity
Cable road applies after voltage measuring medium loss factor or loss current harmonic component to diagnose in whole cable with the presence or absence of water
Tree deterioration.But this state characteristic quantity of dielectric dissipation factor is not only intake with cable or connector, and generation water-treeing is related, and
It is influenced by other factors such as insulating thermal aging, chemical agings, and can only reflect that the whole water-treeing of cable is horizontal.Loss electricity
Harmonic component is flowed as state characteristic quantity, at the scene when testing inspection, needs high-voltage test electric power, current comparator bridge etc. more
Kind device means cooperation, detection process is implemented complex, cumbersome.
In prior art CN104458821 A, a kind of time domain impulse inspection of crosslinked cable connector water inlet state is disclosed
Survey method, technical solution basic principle is correct, but not in view of high-frequency impulse is significantly decayed with the increase of transmission range, therefore
End reflection wave can not easily be detected in head end, additionally due to the background interference of test environment is difficult to ensure, and connector water inlet band
The back wave come is smaller, and there may be very much like signal in ambient noise, above-mentioned two o'clock all causes this method and answering
There are biggish limitations in.
Therefore it needs to provide a kind of cable connector water inlet defects detection and diagnostic method, realizes to long-distance cable line electricity
The detection and diagnosis of cable joint water inlet state.
Summary of the invention
The object of the present invention is to provide a kind of methods that cable connector water inlet state is judged using time domain impulse, using low pressure
The injection of high frequency time domain impulse, the mode of the synchronous amplification in end, by comparing initial and end end injected pulse waveform and reflected pulse waveform
Characteristic similarity or diversity judge crosslinked cable connector intake state, it is diagnostic offline can not only to make up existing cable route
Test can not directly detect, diagnosing cable connector with the presence or absence of intake and water inlet degree the shortcomings that, realize to cable connector into
The detection and diagnosis of water state, simultaneously because the introducing of the synchronous amplification of cable tail end, theoretically at least improves in former scheme
The measuring distance that one times of (CN104458821 A), simultaneously because the pulse signal of impulses injection bring transmitting twice has well
Symmetry, testing staff can be helped more easily to identify connector bring reflection configuration in interference signal.
A kind of cable connector water inlet defects detection and diagnostic method, comprising the following steps:
(1) pulse signal of the injection with steep rising edge, cable tail end are equipped with synchronization pulse amplifier in the cable；
(2) injected pulse and its response signal waveform are observed；
(3) compare the characteristic impedance of four parts in cable: connector proximal end cable characteristic impedance Z1, joint characteristics impedance Z2、
Connector distal end cable characteristic impedance Z3, cable end piece characteristic impedance Z4。
Wherein before injected pulse signal, cable run has a power failure and every phase cable metallic screens layer is respectively shorted.
Wherein injected pulse signal is when using between conductor thread core and metal screen layer in cable head in the cable
Domain clock injected pulse signal.
Wherein pulse signal is that a polarity is known and pulse signal I with steep rising edgemp。
Wherein rising time≤10nS of pulse signal.
It wherein observes injected pulse and its response signal waveform is using high speed oscilloscope device OSC.
Wherein in pulse signal communication process, since connector is among cable run, and joint characteristics impedance Z2With connect
Head proximal end cable characteristic impedance Z1It mismatches, injected pulse ImpFrom connector proximal end cable characteristic impedance Z1Propagate to joint characteristics resistance
Anti- Z2It will reflect, generate reflected impulse I2refIt returns.
Wherein in pulse signal communication process, due to joint characteristics impedance Z2With connector distal end cable characteristic impedance Z3No
Matching, injected pulse ImpFrom joint characteristics impedance Z2Continue to propagate to connector distal end cable characteristic impedance Z3It will reflect, produce
Raw reflected impulse I3refIt returns.
Wherein in pulse signal communication process, injected pulse ImpFrom connector distal end cable characteristic impedance Z3Continue to propagate to
Cable end piece, the synchronization pulse amplifier of cable end piece setting is by injected pulse ImpThe signal for being transmitted to end carries out impedance
After matching and signal amplification, distal end injected pulse I4, end injected pulse I4Polarity of wave and injected pulse ImpIt is identical, but amplitude
Increase or remains unchanged.
End injected pulse I4It is proximally transmitted by end, due to joint characteristics impedance Z2With connector distal end cable spy
Levy impedance Z3It mismatches, end injected pulse I4From cable characteristic impedance Z3Continue to propagate to joint characteristics impedance Z2It will occur anti-
It penetrates, generates reflected impulse I5refEnd is returned to, head end is returned after total reflection, and (tail end synchronization pulse amplifier is open circuit at this time
State).
End injected pulse I4Since connector is among cable run, and joint characteristics impedance Z2With connector proximal end cable spy
Levy impedance Z1It mismatches, end injected pulse I4From connector proximal end cable characteristic impedance Z1Propagate to joint characteristics impedance Z2It will hair
Raw reflection, generates reflected impulse I6refEnd is returned to, head end is returned after total reflection, and (tail end synchronization pulse amplifier is at this time
Open-circuit condition).
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1,
Injected pulse ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate positive reflection, reflected impulse I2ref
Polarity of wave and ImpIt is identical, but amplitude becomes smaller.
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1,
End injected pulse I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1Generate negative reflection, reflected impulse
I6refPolarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector distal end cable characteristic impedance Z3,
Injected pulse ImpFrom joint characteristics impedance Z2It is transmitted to connector distal end cable characteristic impedance Z3Generate negative reflection, reflected impulse I3ref
Polarity of wave and ImpIt is identical, but amplitude becomes smaller.
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1,
End injected pulse I4From connector distal end cable characteristic impedance Z3It is transmitted to joint characteristics impedance Z2Generate positive reflection, reflection coefficient
Greater than 1, reflected impulse I5refPolarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z1, note
Enter pulse ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate negative reflection, reflected impulse I2refWave
Shape polarity and ImpOn the contrary, amplitude becomes smaller.
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z1, end
Hold injected pulse I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1It generates negative and positive to penetrate, reflected impulse
I6refPolarity of wave and end injected pulse I4Identical, amplitude becomes smaller.
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector distal end cable characteristic impedance Z3, note
Enter pulse ImpFrom joint characteristics impedance Z2It is transmitted to connector distal end cable characteristic impedance Z3Generate positive reflection, reflected impulse I3refWave
Shape polarity and ImpIdentical, amplitude becomes smaller.
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z3, end
Hold injected pulse I4From joint characteristics impedance Z3It is transmitted to connector proximal end cable characteristic impedance Z3It generates negative and positive to penetrate, reflected impulse
I6refPolarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
The wherein condition that diagnosing cable connector is seriously intake are as follows: joint characteristics impedance Z2The cable characteristic impedance of < < connector proximal end
Z1, then injected pulse ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate negative total reflection, reflection
Coefficient is 1, reflected impulse I2refPolarity of wave and ImpOn the contrary, amplitude is close, and ImpBecause total reflection occurs not propagate further along.
Method proposed by the invention can utilize crosslinking solid isolation cable in the case where not applying external test high pressure
The otherness of characteristic impedance and cable connector characteristic impedance judges cable to the Different Effects rule of time domain pulse signal transmission
Connector with the presence or absence of water inlet, make up the offline diagnostic test of existing cable route can not directly detect, diagnosing cable connector whether
The shortcomings that in the presence of water inlet and water inlet degree, the detection and diagnosis to cable connector water inlet state are realized, simultaneously because tail end is same
The introducing for walking amplification theoretically at least improves in former scheme the measuring distance of one times of (CN104458821 A), simultaneously because two
Subpulse, which injects bring transmitting pulse signal, has good symmetry, and testing staff can be helped more easily to believe in interference
Number identifying connector bring reflection configuration.
Detailed description of the invention
Fig. 1 is the time domain impulse propagation model schematic diagram of crosslinked cable and cable connector in cable run in the present invention；
Fig. 2 is the time domain impulse wave character schematic diagram that cable connector is not intake in the present invention；
Fig. 3 is the time domain impulse detection waveform feature schematic diagram of cable connector water inlet in the present invention；
Fig. 4 is the time domain impulse detection waveform feature schematic diagram that cable connector is intake completely in the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Referring to Fig.1, Fig. 1 is detection mould used in the time domain impulse detection method of crosslinked cable connector of the present invention water inlet state
Type figure.As shown in Figure 1, crosslinked cable connector 3 is at the docking of two crosslinked cables in figure, 3 proximal end of cable connector is that connector is close
End cable 4,3 distal end of cable connector are connector distal end cable 5.Crosslinked cable is by conductor thread core and is enclosed in outside the conductor thread core
The metal screen layer on surface forms.
A kind of cable connector water inlet defects detection and diagnostic method, the specific steps are as follows:
In the case of cable run has a power failure and every phase cable metallic screens layer is respectively shorted, cable head from conductor thread core and
Time domain impulse source 1 is used between metal screen layer, injects known to a polarity and have the pulse signal I of steep rising edgemp(pulse
Rising time≤10nS)；
Injected pulse I is observed using high speed oscilloscope device OSC 2mpAnd its response signal waveform；
Since connector is among cable run, and its joint characteristics impedance Z2With connector proximal end cable characteristic impedance Z1Not
Match, injected pulse ImpFrom Z1Propagate to Z2It will reflect, generate reflected impulse I2refIt returns；
Joint characteristics impedance Z2With connector distal end cable characteristic impedance Z3It mismatches, injected pulse ImpFrom Z2Continue to propagate to
Z3It will reflect, generate reflected impulse I3refIt returns；
Injected pulse ImpFrom connector distal end cable characteristic impedance Z3Continue to propagate to cable end piece, cable end piece is arranged same
Step pulse signal amplifier is by injected pulse ImpAfter being transmitted to the signal progress impedance matching and signal amplification of end, distal end is injected
Pulse I4, end injected pulse I4Polarity of wave and injected pulse ImpIt is identical, but amplitude increases or remains unchanged；
End injected pulse I4It is proximally transmitted by end, due to joint characteristics impedance Z2With connector distal end cable spy
Levy impedance Z3It mismatches, end injected pulse I4From cable characteristic impedance Z3Continue to propagate to joint characteristics impedance Z2It will occur anti-
It penetrates, generates reflected impulse I5refEnd is returned to, head end is returned after total reflection, and (tail end synchronization pulse amplifier is open circuit at this time
State)；
End injected pulse I4Since connector is among cable run, and joint characteristics impedance Z2With connector proximal end cable spy
Levy impedance Z1It mismatches, end injected pulse I4From connector proximal end cable characteristic impedance Z1Propagate to joint characteristics impedance Z2It will hair
Raw reflection, generates reflected impulse I6refEnd is returned to, head end is returned after total reflection, and (tail end synchronization pulse amplifier is at this time
Open-circuit condition).
Referring to Fig. 2, the time domain impulse wave character schematic diagram that cable connector is not intake.
If cable connector is not intake, joint characteristics impedance is greater than the cable characteristic impedance of connector proximal end, i.e. Z2>Z1, injection
Pulse ImpFrom Z1It is transmitted to Z2Positive reflection is generated, reflected impulse I2refPolarity of wave and ImpIt is identical, but amplitude becomes smaller；
If cable connector is not intake, joint characteristics impedance is greater than the cable characteristic impedance of connector distal end, i.e. Z2>Z3, injection
Pulse ImpFrom Z2It is transmitted to Z3Negative reflection is generated, reflected impulse I3refPolarity of wave and ImpIt is identical, but amplitude becomes smaller；
If cable connector is not intake, joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1, end injected pulse
I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1Negative reflection is generated, reflected impulse I6refPolarity of wave
With end injected pulse I4On the contrary, amplitude becomes smaller.
If cable connector is not intake, joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1, end injected pulse I4
From connector distal end cable characteristic impedance Z3It is transmitted to joint characteristics impedance Z2Positive reflection is generated, reflection coefficient is greater than 1, reflected impulse
I5refPolarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
Referring to Fig. 3, the time domain impulse detection waveform feature schematic diagram of cable connector water inlet.
If cable connector has water inlet, joint characteristics impedance is less than the cable characteristic impedance of connector proximal end, i.e. Z2<Z1, note
Enter pulse ImpFrom Z1It is transmitted to Z2Negative reflection is generated, reflected impulse I2refPolarity of wave and ImpOn the contrary, amplitude becomes smaller；
If cable connector has water inlet, joint characteristics impedance is less than the cable characteristic impedance of connector distal end, i.e. Z2<Z3, note
Enter pulse ImpFrom Z2It is transmitted to Z3Positive reflection is generated, reflected impulse I3refPolarity of wave and ImpIdentical, amplitude becomes smaller；
If there is water inlet, joint characteristics impedance Z in cable connector2< connector proximal end cable characteristic impedance Z1, end injected pulse
I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1It generates negative and positive to penetrate, reflected impulse I6refPolarity of wave
With end injected pulse I4Identical, amplitude becomes smaller.
If there is water inlet, joint characteristics impedance Z in cable connector2< connector proximal end cable characteristic impedance Z3, end injected pulse
I4From joint characteristics impedance Z3It is transmitted to connector proximal end cable characteristic impedance Z3It generates negative and positive to penetrate, reflected impulse I6refPolarity of wave
With end injected pulse I4On the contrary, amplitude becomes smaller.
Referring to Fig. 4, the time domain impulse detection waveform feature schematic diagram that cable connector is intake completely.
If connector has serious water inlet, conductor thread core and metal screen layer is caused to be shorted, impedance Z2Much smaller than connector
Proximal end cable characteristic impedance Z1, i.e. Z2<<Z1, then injected pulse ImpFrom Z1It is transmitted to Z2Negative total reflection is generated, reflection coefficient is
1, reflected impulse I2refPolarity of wave and ImpOn the contrary, amplitude is close, and ImpBecause total reflection occurs not propagate further along.
Applicant combines Figure of description to be described in detail and describe the embodiment of the present invention, but this field skill
Art personnel are it should be understood that above embodiments are only the preferred embodiments of the invention, and explanation is intended merely to help reader in detail
More fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on invention essence of the invention
Any improvement or modification made by mind should all be fallen within the scope and spirit of the invention.
Claims (20)
1. a kind of cable connector water inlet defects detection and diagnostic method, comprising the following steps:
(1) pulse signal of the injection with steep rising edge, cable tail end are equipped with synchronization pulse amplifier in the cable；
(2) injected pulse of initial and end end and its response signal waveform are observed；
(3) compare the characteristic impedance of four parts in cable: connector proximal end cable characteristic impedance Z1, joint characteristics impedance Z2, connector
Distal end cable characteristic impedance Z3, cable end piece characteristic impedance Z4。
2. detection according to claim 1 and diagnostic method,
Wherein before injected pulse signal, cable run has a power failure and every phase cable metallic screens layer is respectively shorted.
3. detection according to claim 1 and diagnostic method,
Wherein injected pulse signal is to use time domain arteries and veins between conductor thread core and metal screen layer in cable head in the cable
Rush source injected pulse signal.
4. detection according to claim 1 and diagnostic method,
Wherein pulse signal is that a polarity is known and pulse signal I with steep rising edgemp。
5. detection according to claim 1 and diagnostic method,
Wherein rising time≤10nS of pulse signal.
6. detection according to claim 1 and diagnostic method,
It wherein observes injected pulse and its response signal waveform is using high speed oscilloscope device OSC.
7. detection according to claim 1 and diagnostic method,
Wherein in pulse signal communication process, since connector is among cable run, and joint characteristics impedance Z2With connector proximal end
Cable characteristic impedance Z1It mismatches, injected pulse ImpFrom connector proximal end cable characteristic impedance Z1Propagate to joint characteristics impedance Z2It will
It reflects, generates reflected impulse I2refIt returns.
8. detection according to claim 1 and diagnostic method,
Wherein in pulse signal communication process, due to joint characteristics impedance Z2With connector distal end cable characteristic impedance Z3It mismatches,
Injected pulse ImpFrom joint characteristics impedance Z2Continue to propagate to connector distal end cable characteristic impedance Z3It will reflect, generate reflection
Pulse I3refIt returns.
9. detection according to claim 1 and diagnostic method,
Wherein in pulse signal communication process, injected pulse ImpFrom connector distal end cable characteristic impedance Z3Continue to propagate to cable
End, the synchronization pulse amplifier of end setting is by injected pulse ImpThe signal for being transmitted to end carries out impedance matching and letter
Number amplification after, in end injected pulse I4, end injected pulse I4Polarity of wave and injected pulse ImpIt is identical, but amplitude increase or
It remains unchanged.
10. detection according to claim 1 and diagnostic method,
Wherein end injected pulse I4It is proximally transmitted by end, due to joint characteristics impedance Z2With connector distal end cable spy
Levy impedance Z3It mismatches, end injected pulse I4From cable characteristic impedance Z3Continue to propagate to joint characteristics impedance Z2It will occur anti-
It penetrates, generates reflected impulse I5refEnd is returned to, head end is returned to after total reflection, at this time the synchronization pulse amplifier of cable tail end
For open-circuit condition.
11. detection according to claim 1 and diagnostic method,
Wherein since connector is among cable run, and joint characteristics impedance Z2With connector proximal end cable characteristic impedance Z1It mismatches,
End injected pulse I4From connector proximal end cable characteristic impedance Z1Propagate to joint characteristics impedance Z2It will reflect, generate reflection
Pulse I6refEnd is returned to, head end is returned after total reflection, the synchronization pulse amplifier of cable tail end is open-circuit condition at this time.
12. detection according to claim 1 and diagnostic method,
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1, injection
Pulse ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate positive reflection, reflected impulse I2refWaveform
Polarity and ImpIt is identical, but amplitude becomes smaller.
13. detection according to claim 1 and diagnostic method,
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1, end
Injected pulse I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1Generate negative reflection, reflected impulse I6ref
Polarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
14. detection according to claim 1 and diagnostic method,
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector distal end cable characteristic impedance Z3, injection
Pulse ImpFrom joint characteristics impedance Z2It is transmitted to connector distal end cable characteristic impedance Z3Generate negative reflection, reflected impulse I3refWaveform
Polarity and ImpIt is identical, but amplitude becomes smaller.
15. detection according to claim 1 and diagnostic method,
The wherein condition that diagnosing cable connector is not intake are as follows: joint characteristics impedance Z2> connector proximal end cable characteristic impedance Z1, end
Injected pulse I4From connector distal end cable characteristic impedance Z3It is transmitted to joint characteristics impedance Z2Positive reflection is generated, reflection coefficient is greater than
1, reflected impulse I5refPolarity of wave and end injected pulse I4On the contrary, amplitude becomes smaller.
16. detection according to claim 1 and diagnostic method,
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z1, inject arteries and veins
Rush ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate negative reflection, reflected impulse I2refWaveform pole
Property and ImpOn the contrary, amplitude becomes smaller.
17. detection according to claim 1 and diagnostic method,
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z1, end note
Enter pulse I4From joint characteristics impedance Z2It is transmitted to connector proximal end cable characteristic impedance Z1It generates negative and positive to penetrate, reflected impulse I6refWave
Shape polarity and end injected pulse I4Identical, amplitude becomes smaller.
18. detection according to claim 1 and diagnostic method,
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector distal end cable characteristic impedance Z3, inject arteries and veins
Rush ImpFrom joint characteristics impedance Z2It is transmitted to connector distal end cable characteristic impedance Z3Generate positive reflection, reflected impulse I3refWaveform pole
Property and ImpIdentical, amplitude becomes smaller.
19. detection according to claim 1 and diagnostic method,
The wherein condition of diagnosing cable connector water inlet are as follows: joint characteristics impedance Z2< connector proximal end cable characteristic impedance Z3, end note
Enter pulse I4From joint characteristics impedance Z3It is transmitted to connector proximal end cable characteristic impedance Z3It generates negative and positive to penetrate, reflected impulse I6refWave
Shape polarity and end injected pulse I4On the contrary, amplitude becomes smaller.
20. detection according to claim 1 and diagnostic method,
The wherein condition that diagnosing cable connector is seriously intake are as follows: joint characteristics impedance Z2< < connector proximal end cable characteristic impedance Z1, then
Injected pulse ImpFrom connector proximal end cable characteristic impedance Z1It is transmitted to joint characteristics impedance Z2Generate negative total reflection, reflection coefficient
It is 1, reflected impulse I2refPolarity of wave and ImpOn the contrary, amplitude is close, and ImpBecause total reflection occurs not propagate further along.
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| CN111090022A (en) * | 2019-11-25 | 2020-05-01 | 国网山西省电力公司大同供电公司 | TDR-based water seepage defect accurate positioning method |
| CN111610410A (en) * | 2020-05-27 | 2020-09-01 | 上海岩芯电子科技有限公司 | SSTDR technology-based photovoltaic cable sub-health detection and positioning method |
| CN113376494A (en) * | 2021-08-16 | 2021-09-10 | 国网江苏省电力有限公司电力科学研究院 | Method for detecting potential defects of fire hidden danger of cable |
| CN114280411A (en) * | 2021-11-19 | 2022-04-05 | 中国电建集团河北省电力勘测设计研究院有限公司 | Test method for obtaining high-frequency response of cable |
| CN114578732A (en) * | 2022-03-02 | 2022-06-03 | 中国船舶重工集团公司第七0七研究所九江分部 | Device and method for detecting accidental water inflow of electronic equipment by utilizing CAN bus |
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