CN107807146A - The simulated test special purpose device and test method of a kind of thunder-strike current ablation pipeline - Google Patents
The simulated test special purpose device and test method of a kind of thunder-strike current ablation pipeline Download PDFInfo
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- CN107807146A CN107807146A CN201711279822.8A CN201711279822A CN107807146A CN 107807146 A CN107807146 A CN 107807146A CN 201711279822 A CN201711279822 A CN 201711279822A CN 107807146 A CN107807146 A CN 107807146A
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- 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
Abstract
The invention provides a kind of simulated test special purpose device of thunder-strike current ablation pipeline, including：Impulse current generator (1), for simulating the thunder-strike current of Near Pipelines；High pressure oscilloscope (2), for observing and preserving discharge current waveform；Auxiliary electrode (3), for forming loop of polarizing, test specimen is set to have electric current to pass through；And actual soil environment case (4).A kind of simulation experiment method of thunder-strike current ablation pipeline is also provided, including：(1) numerical simulation technology Modeling Calculation is used, obtains pipeline withstanding voltage corresponding to thunder-strike current；(2) thunderbolt simulated test is carried out in laboratory, sees whether ablation occur；(3) the ablation test piece after lightning test is obtained after traveling through typical thunder-strike current, ablation test piece is analyzed, including morphology observation, contextual analysis of organization, mechanics property analysis and Residual Strength Assessment；(4) the influence result of critical ablation condition and thunder-strike current ablation to pipeline of being struck by lightning is obtained.
Description
Technical field
The present invention relates to simulated test field, more particularly to thunder-strike current to steel pipe ablative mechanism research process
The simulated test field of required progress.
Background technology
The corrosion control measure of current pipeline is generally the mode of external anti-corrosion layer+cathodic protection Combined Protection, external anti-corrosion layer
Material is usually 3LPE, but finds that pipeline has segmental defect during detection excavation checking in being carried out to pipeline, divest anticorrosive coat
Occurs the etch pit of similar ablation afterwards, Near Pipelines have HVAC power transmission line, its distance about 63m with pipeline, preliminary point
It is probably as caused by thunderbolt or fault current to analyse the rhegmalypt.However, it is current in the prior art but not expansion for
The research that earth current influences to caused by pipeline body during thunderbolt high-tension line, so as to which the protection that can not carry out for thunderbolt is arranged
The research applied.
The pertinent literature both at home and abroad on buried pipeline thunderbolt ablation etc. is retrieved, is largely focused on for ablation case
The analysis of example, qualitative analysis and the generation of pattern ambient parameter General Summary, for parameter and the relation of ablation simultaneously
Do not carried out and targetedly studied, on a small quantity grinding for the experimental study method of ablation, test parameters and high current ablation
Study carefully and concentrate on the numerical simulation stage, do not complete actual experimental study in laboratory.
The content of the invention
The inventive concept of the present invention is to study influence of the thunder-strike current to buried pipeline by laboratory test, and
By the way that to ablation behavioural analysis, sample tissue structure and mechanical property change test analysis obtain thunder-strike current to burying before and after experiment
The electrical parameter that ground pipeline has an impact, build thunder-strike current using numerical simulation technology influences computation model to buried pipeline, grinds
Parameters are studied carefully to pipeline electrical parameter affecting laws, on this basis, analyze the ablative mechanism of actual pipeline, and it is anti-to carry out abatement
Technical research is protected, including：Safe distance, power network side's safeguard procedures, pipeline side's safeguard procedures, obtain the comprehensive of high current ablation problem
Close abatement protectiving scheme.
Therefore, it is an object of the invention to provide a kind of simulated test special purpose device of thunder-strike current ablation pipeline, pass through
Current feedback circuit carries out the thunder-strike current ablation test of oil pipeline, including：
Impulse current generator (1), for simulating the thunder-strike current of Near Pipelines；
High pressure oscilloscope (2), for observing and preserving discharge current waveform；
Auxiliary electrode (3), for forming loop of polarizing, test specimen is set to have electric current to pass through；
And actual soil environment case (4), for providing actual soil environment when thunder-strike current occurs for Near Pipelines.
Preferably, in addition to current divider and drop bar, the current divider are used for the thunderbolt electricity for repeatedly adjusting simulated test
Quantity is flowed, the drop bar is used to discharge to capacitor in simulation test procedure.
Preferably, the impulse current generator (1) includes single-phase voltage regulator D, testing transformer T1, T2, high voltage silicon rectifier stack
G, capacitor bank C, pulse trigger H, harmonic inductance L and wave regulating resistor R.
Preferably, the auxiliary electrode (3) is small using resistance, and the platinum or carbon electrode of polarization are less likely to occur.
The present invention also aims to provide a kind of simulation experiment method of thunder-strike current ablation pipeline, the test method
Comprise the following steps：
(1) calculating is modeled using numerical simulation technology, obtains pipeline withstanding voltage corresponding to thunder-strike current；
(2) thunderbolt simulated test is carried out in laboratory, sees whether ablation occur, if there is not pipeline ablation,
Then improve thunder-strike current and continue simulated test, if there is pipeline ablation, then reduce thunder-strike current and continue simulation examination
Test；
(3) the ablation test piece after lightning test is obtained after traveling through typical thunder-strike current, ablation test piece is analyzed, including
Morphology observation, contextual analysis of organization, mechanics property analysis and Residual Strength Assessment；
(4) the influence result of critical ablation condition and thunder-strike current ablation to pipeline of being struck by lightning is obtained.
Preferably, the step (2) comprises the following steps：
The duct test sample (5) that (2-1) prepares same size is some；
(2-2) checks single-phase voltage regulator D, the ball discharge gap and high pressure oscilloscope of impulse current generator (1)；
(2-3) completes to test the wiring of special purpose device according to claim 1-4 any one claim, and should use up
Experimental loop connecting line may be shortened, reduce winding, to reduce measurement error；
(2-4) regulate ignition ball gap and other each ball stand-off distances from；
Harmonic inductance L, wave regulating resistor R and duct test sample (5) short circuit are applied the charging voltage of thousands of volts by (2-5),
Observe and preserve discharge current waveform；
(2-6) removes above-mentioned shorting stub, and regulation ball stand-off distance makes simulation thunder from the size with harmonic inductance L, wave regulating resistor R
The waveform for hitting electric current is measured and recorded logical close to interference voltage during maximum interference, i.e. 100kA close to 8/20 μ s, amplitude
The dash current of piping test specimen (5) and the waveform of residual voltage, the ablation situation of shooting test specimen (5)；
(2-7) keeps the wiring of above-mentioned steps (2-6) constant, changes the size of simulation thunder-strike current, that is, changes main capacitance
Charging voltage and adjust the distance of trigger sphere gap, repeat test；
(2-8) adjusts the voltage difference between pipeline and neighbouring soil under different dash currents, respectively to duct test sample (5)
Ablation test is carried out, the VA characteristic curve of test specimen is drawn out thereafter according to test data, is arranged under different rush of currents
The ablation collection of illustrative plates of pipeline；
(2-9) contrasts actual ablation photo and ablation collection of illustrative plates, and further regulation simulation thunder-strike current size repeats to test, and makes
Experimental result is as far as possible close with actual ablation situation, improves ablation collection of illustrative plates and VA characteristic curve.
Preferably, first to capacitor discharges at different levels in the step (2-4), then drop bar is hung over the copper to be adjusted
Carried out after on ball each ball stand-off distance from regulation.
Preferably, the step (2-7) every time harmonic or change test product and regulation ball stand-off distance from when, be both needed to cut off the electricity supply,
And main capacitance is substantially discharged, discharge resistance electric discharge directly electric discharge again must be first passed through during electric discharge, then drop bar is hung
On main capacitor, to ensure personal safety.
Preferably, step (2-8) dash current selects respectively according to operating mode and the result of calculation of numerical simulation technology
It is selected as 100KA, 80KA, 60KA, 40KA, 20KA, 10KA, 5KA, 1KA；The duct test sample (5) is 20cm*20cm actual
Pipe line steel material, and have 3PE anticorrosive coats (6), on the anticorrosive coat (6) the defects of making 3mm.
Preferably, the simulation experiment method adjusts interference voltage and time parameter, will tested according to there is ablation situation
Parameter is encrypted near ablation critical value, and other deviate the parameter of critical value farther out and cut down.
Using the influence of laboratory test equipment and technique study thunder-strike current to buried pipeline, and by burning
Behavioural analysis is lost, sample tissue structure and mechanical property change test analysis obtain thunder-strike current and buried pipeline produced before and after experiment
The raw electrical parameter influenceed, build thunder-strike current using numerical simulation technology influences computation model to buried pipeline, studies each ginseng
It is several to pipeline electrical parameter affecting laws, on this basis, it is possible to analyze the ablative mechanism of actual pipeline, and carry out abatement protection
Technical research, including：Safe distance, power network side's safeguard procedures, pipeline side's safeguard procedures, obtain the synthesis of high current ablation problem
Cut down protectiving scheme, qualitative and quantitative helpful reference is provided for the corrosion protection of long-distance pipe.
According to the accompanying drawings will be brighter to the detailed description of the specific embodiment of the invention, those skilled in the art
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.The target and feature of the present invention is considered to will be apparent from below in conjunction with the description of accompanying drawing,
In accompanying drawing：
Accompanying drawing 1 is the simulated test special purpose device topology view according to the thunder-strike current ablation pipeline of the embodiment of the present invention；
Accompanying drawing 2 is the simulation experiment method schematic diagram according to the thunder-strike current ablation pipeline of the embodiment of the present invention；
Accompanying drawing 3 is the operational flowchart according to the simulation experiment method laboratory part of the embodiment of the present invention；
Accompanying drawing 4 is that thunder and lightning ablation problem is converted into examination under actual condition in the simulation experiment method according to the embodiment of the present invention
Test the schematic diagram of room test parameters.
Accompanying drawing 5 is the DC current according to the embodiment of the present invention to negative electrode and the ablated region ablation pattern schematic diagram of anode.
Embodiment
Referring to accompanying drawing 1, a kind of simulated test special purpose device of thunder-strike current ablation pipeline, carried out by current feedback circuit defeated
The thunder-strike current ablation test of oil-piping, including：Impulse current generator 1, for simulating the thunder-strike current of Near Pipelines；High pressure
Oscillograph 2, for observing and preserving discharge current waveform；Auxiliary electrode 3, for forming loop of polarizing, test specimen is set to have electricity
Stream passes through；And actual soil environment case 4, for providing actual soil environment when thunder-strike current occurs for Near Pipelines, this is special
Also include current divider and drop bar with device, current divider is used for the thunder-strike current quantity for repeatedly adjusting simulated test, drop bar
For being discharged in simulation test procedure capacitor.Wherein impulse current generator 1 includes single-phase voltage regulator D, experiment
Transformer T1, T2, high voltage silicon rectifier stack G, capacitor bank C, pulse trigger H, harmonic inductance L and wave regulating resistor R, wherein aiding in
The effect of electrode is to form polarization loop with tested pipeline sample, makes duct test sample have electric current to pass through.It is general to require auxiliary
The resistance of electrode in itself is small, and is less likely to occur to polarize, and the reaction product of auxiliary electrode side does not have a strong impact on test specimen
Reaction, the present embodiment does auxiliary electrode using platinum or carbon electrode, when auxiliary electrode area is bigger than Electrode area 100 times
When, the polarization of auxiliary electrode can be ignored, naturally it is also possible to which selection is not easy other auxiliary electrode materials of polarization.
The simulation experiment method of thunder-strike current ablation pipeline is carried out using the simulated test special purpose device, such as Fig. 2 thunderbolt electricity
Flow shown in the simulation experiment method schematic diagram of ablation pipeline and the operational flowchart of Fig. 3 simulation experiment methods laboratory part,
Test method is carried out using following steps：
(1) calculating is modeled using numerical simulation technology, obtains pipeline withstanding voltage corresponding to thunder-strike current.For this
The physical basis that embodiment is modeled calculating are, when high-voltage power transmission tower is by being struck by lightning, to have a large amount of electric currents and pass through shaft tower
Earthing pole flows into the earth.Highfield is formed in the earth, neighbouring Pipeline Crossing Program highfield produces electrical potential difference so as to cause high current
Ablation is impacted, as shown in Figure 4.Because laboratory can not simulate the long linear structure of actual pipeline, therefore sent out using indoor impact
" coatings withstood voltage " (voltage difference of coating both sides metal and soil) of pipeline is tried in the case of the different thunders and lightnings of life device simulation
Test, obtain the electrical parameter that thunder and lightning causes pipeline anticorrosion coating fault location (the defects of scene is found size) that ablation occurs.In order that
Result of the test can be mapped with live actual condition, and pipeline and neighbouring soil under different electric currents are calculated using numerical simulation technology
Between potential difference, and corresponding laboratory test is carried out according to result of calculation.Before numerical computations, it is thus necessary to determine that be thunderbolt electricity
Flowing to be different from the dash current of power frequency fault current, the waveform of both electric currents has significant difference, and early-stage Study shows,
Obvious difference be present in ablation of the DC current to negative electrode and anode：Anode region ablation is serious, and cathodic region ablation pattern is slight,
As shown in Figure 5.According to the rule and feature of ablation pattern, live ablative type and Analysis on Mechanism can make a distinction.
(2) thunderbolt simulated test is carried out in laboratory, sees whether ablation occur, if there is not pipeline ablation,
Then improve thunder-strike current and continue simulated test, if there is pipeline ablation, then reduce thunder-strike current and continue simulation examination
Test；The test procedure wherein carried out in laboratory includes：
The duct test sample 5 that (2-1) prepares same size is some, and duct test sample 5 is the actual pipes of 20cm*20cm
Line Steel material, and have 3PE anticorrosive coats 6, on the anticorrosive coat 6 the defects of making 3mm；
(2-2) checks single-phase voltage regulator D, the ball discharge gap of impulse current generator 1, high pressure oscilloscope；
(2-3) completes to test the wiring of special purpose device according to claim 1-4 any one claim, and should use up
Experimental loop connecting line may be shortened, reduce winding, to reduce measurement error；
(2-4) regulate ignition ball gap and other each ball stand-off distances from, pay attention to operation when first to capacitor discharges at different levels, then
Carried out after drop bar is hung on the copper ball to be adjusted each ball stand-off distance from regulation；
Harmonic inductance L, wave regulating resistor R and the short circuit of duct test sample 5 are applied the charging voltage of thousands of volts by (2-5), are seen
Examine and preserve discharge current waveform；
(2-6) removes above-mentioned shorting stub, and regulation ball stand-off distance makes simulation thunder from the size with harmonic inductance L, wave regulating resistor R
The waveform for hitting electric current is measured and recorded logical close to interference voltage during maximum interference, i.e. 100kA close to 8/20 μ s, amplitude
The dash current of piping test specimen 5 and the waveform of residual voltage, shoot the ablation situation of test specimen 5；
(2-7) keeps the wiring of above-mentioned steps (2-6) constant, changes the size of simulation thunder-strike current, that is, changes main capacitance
Charging voltage and adjust the distance of trigger sphere gap, repeat test, each harmonic or change test product and regulation ball stand-off distance from when,
It need to cut off the electricity supply, and main capacitance is substantially discharged, discharge resistance electric discharge directly electric discharge again must be first passed through during electric discharge, then
Drop bar is hung on main capacitor, to ensure personal safety；
(2-8) adjusts the voltage difference between pipeline and neighbouring soil under different dash currents, respectively to duct test sample (5)
Ablation test is carried out, dash current is respectively chosen as 100KA, 80KA according to the result of calculation of operating mode and numerical simulation technology,
60KA, 40KA, 20KA, 10KA, 5KA, 1KA, the VA characteristic curve of test specimen is drawn out thereafter according to test data, arranged
The ablation collection of illustrative plates of pipeline under different rush of currents；
(2-9) contrasts actual ablation photo and ablation collection of illustrative plates, and further regulation simulation thunder-strike current size repeats to test, and makes
Experimental result is as far as possible close with actual ablation situation, improves ablation collection of illustrative plates and VA characteristic curve；
(3) the ablation test piece after lightning test is obtained after traveling through typical thunder-strike current, ablation test piece is analyzed, including
Morphology observation, contextual analysis of organization, mechanics property analysis and Residual Strength Assessment；
(4) the influence result of critical ablation condition and thunder-strike current ablation to pipeline of being struck by lightning is obtained.
It should be noted that the simulation experiment method is needed during carrying out according to there is ablation situation, electricity is disturbed in adjustment
Pressure and time parameter, test parameters is encrypted near ablation critical value, other deviate the parameter of critical value farther out and carried out
Cut down, could so obtain more accurate result of the test.
Experiment proves：, can using the influence of the simulated test facility and technique study thunder-strike current to buried pipeline
By the way that to ablation behavioural analysis, sample tissue structure and mechanical property change test analysis obtain thunder-strike current to burying before and after experiment
The electrical parameter that ground pipeline has an impact, and computation model is influenceed on buried pipeline using numerical simulation technology structure thunder-strike current,
Parameters are studied to pipeline electrical parameter affecting laws, and then analyze the ablative mechanism for obtaining actual pipeline, and it is anti-to carry out abatement
Technical research is protected, including：Safe distance, power network side's safeguard procedures, pipeline side's safeguard procedures, obtain the comprehensive of high current ablation problem
Abatement protectiving scheme is closed, qualitative and quantitative helpful reference is provided for the corrosion protection of long-distance pipe.
Although the present invention is described by reference to specific illustrative embodiment, will not be by these embodiments
Restriction and only limited by accessory claim.It should be understood by those skilled in the art that can be without departing from the present invention's
Embodiments of the invention can be modified and be changed in the case of protection domain and spirit.
Claims (10)
1. a kind of simulated test special purpose device of thunder-strike current ablation pipeline, the thunderbolt of oil pipeline is carried out by current feedback circuit
Electric current ablation test, it is characterised in that including：
Impulse current generator (1), for simulating the thunder-strike current of Near Pipelines；
High pressure oscilloscope (2), for observing and preserving discharge current waveform；
Auxiliary electrode (3), for forming loop of polarizing, test specimen is set to have electric current to pass through；
And actual soil environment case (4), for providing actual soil environment when thunder-strike current occurs for Near Pipelines.
A kind of 2. simulated test special purpose device of thunder-strike current ablation pipeline according to claim 1, it is characterised in that：Also
Including current divider and drop bar, the current divider is used for the thunder-strike current quantity for repeatedly adjusting simulated test, the drop bar
For being discharged in simulation test procedure capacitor.
A kind of 3. simulated test special purpose device of thunder-strike current ablation pipeline according to claim 1, it is characterised in that：Institute
Stating impulse current generator (1) includes single-phase voltage regulator D, testing transformer T1, T2, high voltage silicon rectifier stack G, capacitor bank C, and pulse is touched
Send out device H, harmonic inductance L and wave regulating resistor R.
A kind of 4. simulated test special purpose device of thunder-strike current ablation pipeline according to claim 1, it is characterised in that：Institute
Stating auxiliary electrode (3) uses resistance small, and the platinum or carbon electrode of polarization are less likely to occur.
5. a kind of simulated test special purpose device of thunder-strike current ablation pipeline using claim 1-4 carries out thunder-strike current ablation
The simulation experiment method of pipeline, it is characterised in that the test method comprises the following steps：
(1) calculating is modeled using numerical simulation technology, obtains pipeline withstanding voltage corresponding to thunder-strike current；
(2) thunderbolt simulated test is carried out in laboratory, sees whether ablation occur, if there is not pipeline ablation, is carried
High thunder-strike current continues simulated test, if there is pipeline ablation, then reduces thunder-strike current and continues simulated test；
(3) the ablation test piece after lightning test is obtained after traveling through typical thunder-strike current, ablation test piece is analyzed, including pattern
Observation, contextual analysis of organization, mechanics property analysis and Residual Strength Assessment；
(4) the influence result of critical ablation condition and thunder-strike current ablation to pipeline of being struck by lightning is obtained.
A kind of 6. simulation experiment method of thunder-strike current ablation pipeline according to claim 5, it is characterised in that the step
Suddenly (2) comprise the following steps：
The duct test sample (5) that (2-1) prepares same size is some；
(2-2) checks single-phase voltage regulator D, the ball discharge gap and high pressure oscilloscope of impulse current generator (1)；
(2-3) completes to test the wiring of special purpose device according to claim 1-4 any one claim, and should be as far as possible
Shorten experimental loop connecting line, reduce winding, to reduce measurement error；
(2-4) regulate ignition ball gap and other each ball stand-off distances from；
Harmonic inductance L, wave regulating resistor R and duct test sample (5) short circuit are applied the charging voltage of thousands of volts, observation by (2-5)
And preserve discharge current waveform；
(2-6) removes above-mentioned shorting stub, and regulation ball stand-off distance makes simulation thunderbolt electricity from the size with harmonic inductance L, wave regulating resistor R
Close to 8/20 μ s, amplitude is measured and recorded and pass through pipe close to interference voltage during maximum interference, i.e. 100kA the waveform of stream
The dash current of road test specimen (5) and the waveform of residual voltage, the ablation situation of shooting test specimen (5)；
(2-7) keeps the wiring of above-mentioned steps (2-6) constant, changes the size of simulation thunder-strike current, that is, changes filling for main capacitance
Piezoelectric voltage and the distance for adjusting trigger sphere gap, repeat to test；
(2-8) adjusts the voltage difference between pipeline and neighbouring soil under different dash currents, and duct test sample (5) is carried out respectively
Ablation test, the VA characteristic curve of test specimen is drawn out thereafter according to test data, arrange pipeline under different rush of currents
Ablation collection of illustrative plates；
(2-9) contrasts actual ablation photo and ablation collection of illustrative plates, and further regulation simulation thunder-strike current size repeats to test, and makes experiment
As a result it is as far as possible close with actual ablation situation, improve ablation collection of illustrative plates and VA characteristic curve.
A kind of 7. simulation experiment method of thunder-strike current ablation pipeline according to claim 6, it is characterised in that：The step
Suddenly first to capacitor discharges at different levels in (2-4), then each ball stand-off distance is carried out after drop bar is hung on the copper ball to be adjusted
From regulation.
A kind of 8. simulation experiment method of thunder-strike current ablation pipeline according to claim 6, it is characterised in that：The step
Suddenly (2-7) every time harmonic or change test product and regulation ball stand-off distance from when, be both needed to cut off the electricity supply, and fully put main capacitance
Electricity, discharge resistance electric discharge directly electric discharge again must be first passed through during electric discharge, then drop bar is hung on main capacitor, to ensure people
Body safety.
A kind of 9. simulation experiment method of thunder-strike current ablation pipeline according to claim 6, it is characterised in that：The step
Suddenly (2-8) dash current is respectively chosen as 100KA, 80KA, 60KA according to the result of calculation of operating mode and numerical simulation technology,
40KA, 20KA, 10KA, 5KA, 1KA；The duct test sample (5) is the actual pipe line steel materials of 20cm*20cm, and has 3PE
Anticorrosive coat (6), the defects of 3mm is made on the anticorrosive coat (6).
10. according to a kind of simulation experiment method of any described thunder-strike current ablation pipelines of claim 5-9, its feature exists
In：The simulation experiment method adjusts interference voltage and time parameter according to there is ablation situation, by test parameters close to burning
Lose critical value nearby to encrypt, other deviate the parameter of critical value farther out and cut down.
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| CN108761292A (en) * | 2018-07-25 | 2018-11-06 | 贵州电网有限责任公司 | One kind being used for transmission line wire lightning current ablation characteristics test system |
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| CN110887876A (en) * | 2019-11-15 | 2020-03-17 | 上海交通大学 | Method for detecting lightning damage of carbon fiber composite laminated plate |
| CN111323569A (en) * | 2020-03-26 | 2020-06-23 | 上海市避雷装置检测站工程部 | Experimental platform for testing glass fiber reinforced resin matrix composite material by lightning strike |
| CN111323569B (en) * | 2020-03-26 | 2022-03-15 | 上海市避雷装置检测站工程部 | Experimental platform for testing glass fiber reinforced resin matrix composite material by lightning strike |
| CN111856108A (en) * | 2020-06-12 | 2020-10-30 | 深圳供电局有限公司 | Potential rise experiment system for buried pipeline |
| CN111856109A (en) * | 2020-06-12 | 2020-10-30 | 深圳供电局有限公司 | Potential rise experiment system for buried pipeline |
| CN112014620A (en) * | 2020-07-31 | 2020-12-01 | 深圳供电局有限公司 | Step voltage simulator |
| CN113281622A (en) * | 2021-04-29 | 2021-08-20 | 国网浙江省电力有限公司绍兴供电公司 | Protection method for anticorrosive coating of buried metal energy transmission pipeline |
| CN114355128A (en) * | 2022-03-22 | 2022-04-15 | 合肥航太电物理技术有限公司 | Multi-electrode near lightning stroke pulse electric field effect test method and device |
| CN114355128B (en) * | 2022-03-22 | 2022-05-17 | 合肥航太电物理技术有限公司 | Multi-electrode near lightning stroke pulse electric field effect test method and device |
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