CN207366493U - A kind of simulation test special purpose device of thunder-strike current ablation pipeline - Google Patents
A kind of simulation test special purpose device of thunder-strike current ablation pipeline Download PDFInfo
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Abstract
The utility model provides a kind of simulation 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 circuit of polarizing, makes test specimen have electric current to pass through；And actual soil environment case (4).The simulated test facility can be by ablation behavioural analysis, sample tissue structure and mechanical property change test analysis obtain the electrical parameter that thunder-strike current has an impact buried pipeline before and after experiment, and computation model is influenced 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 carry out abatement guard technology research, the comprehensive abatement protectiving scheme of high current ablation problem is obtained, qualitative and quantitative helpful reference is provided for the corrosion protection of long-distance pipe.
Description
Technical field
Simulation test field is the utility model is related to, steel pipe ablative mechanism was studied more particularly to thunder-strike current
The simulation test field of required progress in journey.
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 in being carried out to pipeline during detection excavation verification, it is found that pipeline there are segmental defect, divests erosion resistant coating
Occurs the etch pit of similar ablation afterwards, Near Pipelines have HVAC power transmission line, its distance about 63km with pipeline, preliminary point
It is probably as caused by lightning stroke or fault current to analyse the rhegmalypt.However, it is current in the prior art but not expansion for
Be struck by lightning high-tension line when earth current or high voltage transmission line tower fault current in inflow and outflow steel pipe caused by pipeline body
The research of influence, so that the research of the safeguard procedures for lightning stroke or failure earth current can not be carried out.
The pertinent literature on buried pipeline lightning stroke, failure, high current ablation etc., major part are concentrated both at home and abroad for retrieval
In the General Summary of the environmental parameter of analysis, the qualitative analysis of pattern and generation for ablation case, for parameter with
The relation of ablation was not carried out and was targetedly studied, on a small quantity for the experimental study method of ablation, test parameters and big
The research of electric current ablation concentrates on the numerical simulation stage, does not complete actual simulation study in laboratory.
The content of the invention
The inventive concept of the utility model is to study shadow of the thunder-strike current to buried pipeline by laboratory test
Ring, and by the way that to ablation behavioural analysis, sample tissue structure and mechanical property change test analysis obtain lightning stroke electricity before and after experiment
The electrical parameter being had an impact to buried pipeline is flowed, building thunder-strike current using numerical simulation technology influences buried pipeline to calculate mould
Type, research parameters on this basis, analyze the ablative mechanism of actual pipeline, and carry out to pipeline electrical parameter affecting laws
Cut down guard technology research, including：Safe distance, power grid side's safeguard procedures, pipeline side's safeguard procedures, obtain high current ablation and ask
The comprehensive abatement protectiving scheme of topic.
For this reason, the purpose of this utility model is to provide a kind of simulation test special purpose device of thunder-strike current ablation pipeline,
The thunder-strike current ablation test of oil pipeline is carried out by current feedback circuit, 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 circuit of polarizing, makes test specimen 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, current divider and drop bar are further included, the current divider is used for the lightning stroke electricity for repeatedly adjusting simulation 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 group C, pulse trigger H, harmonic inductance L and wave regulating resistor R.
Preferably, the auxiliary electrode (3) is small using resistance, and polarized platinum or carbon electrode are less likely to occur.
The test method carried out using the simulation test special equipment of the thunder-strike current ablation pipeline is included the following steps：
(1) calculating is modeled using numerical simulation technology, obtains the corresponding pipeline withstanding voltage of thunder-strike current；
(2) lightning stroke simulation test is carried out in laboratory, sees whether ablation occur, if there is not pipeline ablation,
Then improve thunder-strike current and continue simulation 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.
Wherein, the step (2) includes 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, adjusts ball stand-off distance from the size with harmonic inductance L, wave regulating resistor R, makes simulation thunder
The waveform of electric current is hit close to 8/20 μ s, interference voltage when amplitude is close to maximum interference, i.e. 100kA, measures and record logical
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 current
The ablation collection of illustrative plates of pipeline；
(2-9) contrasts actual ablation photo and ablation collection of illustrative plates, further adjusts simulation thunder-strike current size and repeats to test, makes
Experimental result is as far as possible close with actual ablation situation, improves ablation collection of illustrative plates and VA characteristic curve.
Wherein, first to capacitor discharges at different levels in step (2-4), then after drop bar is hung on the copper ball to be adjusted
Carry out each ball stand-off distance from adjusting.The step (2-7) every time harmonic or replace test product and adjust ball stand-off distance from when, be both needed to cut
Power-off source, and being substantially discharged to main capacitance, when electric discharge, must first pass through discharge resistance electric discharge directly electric discharge again, then connecing
Ground rod is hung on main capacitor, to ensure personal safety.Step (2-8) dash current is according to operating mode and numerical simulation technology
Result of calculation is respectively chosen as 100KA, 80KA, 60KA, 40KA, 20KA, 10KA, 5KA, 1KA；The duct test sample (5)
The defects of for the actual pipe line steel materials of 20cm*20cm, and having 3PE erosion resistant coatings (6), 3mm made on the erosion resistant coating (6).
It should be noted that simulation experiment method adjusts interference voltage and time parameter, test parameters is existed according to there is ablation situation
Nearby encrypted close to ablation critical value, other deviate the parameter of critical value farther out and are cut down.
Using influence of the laboratory test equipment research thunder-strike current to buried pipeline, and by ablation behavior point
Analysis, sample tissue structure and mechanical property change test analysis obtain what thunder-strike current had an impact buried pipeline before and after experiment
Electrical parameter, building thunder-strike current using numerical simulation technology influences buried pipeline computation model, and research parameters are to pipeline
Electrical parameter affecting laws, on this basis, it is possible to the ablative mechanism of the actual pipeline of analysis, and carry out abatement guard technology and grind
Study carefully, including：Safe distance, power grid side's safeguard procedures, pipeline side's safeguard procedures, the comprehensive abatement for obtaining high current ablation problem are anti-
Shield scheme, qualitative and quantitative helpful reference is provided for the corrosion protection of long-distance pipe.
According to the accompanying drawings will be more to the detailed description of the utility model specific embodiment, those skilled in the art
Add the above-mentioned and other purposes, advantages and features of clear the utility model.
Brief description of the drawings
Some specific realities of the utility model are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter
Apply example.Identical reference numeral denotes same or similar component or part in attached drawing.It should be appreciated by those skilled in the art that
What these attached drawings were not necessarily drawn to scale.The target and feature of the utility model will more in view of the description below in conjunction with attached drawing
Add substantially, in attached drawing：
Attached drawing 1 is to be regarded according to the simulation test special purpose device structure of the thunder-strike current ablation pipeline of the utility model embodiment
Figure；
Attached drawing 2 is the simulation experiment method schematic diagram according to the thunder-strike current ablation pipeline of the utility model embodiment；
Attached drawing 3 is the operational flowchart according to the simulation experiment method laboratory part of the utility model embodiment；
Attached drawing 4 is that thunder and lightning ablation problem converts under actual condition in the simulation experiment method according to the utility model embodiment
For the schematic diagram of laboratory test parameter.
Embodiment
Referring to attached drawing 1, a kind of simulation test special purpose device of thunder-strike current ablation pipeline, is carried out defeated by current feedback circuit
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 circuit of polarizing, makes test specimen 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
Current divider and drop bar are further included with device, current divider is used for the thunder-strike current quantity for repeatedly adjusting simulation test, drop bar
For discharging 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 group C, pulse trigger H, harmonic inductance L and wave regulating resistor R, wherein aiding in
The effect of electrode is to form polarization circuit 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 seriously affect test specimen
Reaction, the present embodiment does auxiliary electrode using platinum or carbon electrode, when auxiliary electrode area is 100 times bigger than Electrode area
When, the polarization of auxiliary electrode can be ignored, naturally it is also possible to which selection is not easy other polarized auxiliary electrode materials.
The simulation experiment method of thunder-strike current ablation pipeline is carried out using the simulation test special purpose device, such as Fig. 2 lightning stroke 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 the corresponding pipeline withstanding voltage of 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.Since laboratory can not simulate the long linear structure of actual pipeline, 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 to enable
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.I.e. by numerical simulation technology (C) in actual condition
Under pipeline and soil between establish equivalent relation between voltage difference (A) and the voltage difference (B) of laboratory test.In number
Before value calculates, it is thus necessary to determine that be that thunder-strike current is the dash current for being different from power frequency fault current, the waveform of both electric currents
There is significant difference, early-stage study shows, ablation of the DC current to cathode and anode has obvious difference：Burn anode region
Erosion is serious, and cathodic region ablation pattern is slight.According to the rule and feature of ablation pattern, live ablative type and Analysis on Mechanism can
To distinguish.
(2) lightning stroke simulation test is carried out in laboratory, sees whether ablation occur, if there is not pipeline ablation,
Then improve thunder-strike current and continue simulation 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 erosion resistant coatings 6, on the erosion resistant coating 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 adjusting；
Harmonic inductance L, wave regulating resistor R and 5 short circuit of duct test sample 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, adjusts ball stand-off distance from the size with harmonic inductance L, wave regulating resistor R, makes simulation thunder
The waveform of electric current is hit close to 8/20 μ s, interference voltage when amplitude is close to maximum interference, i.e. 100kA, measures and record logical
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 replace test product and adjust ball stand-off distance from when,
It need to cut off the power, and main capacitance is substantially discharged, when electric discharge must first pass through discharge resistance electric discharge directly electric discharge again, 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, whole
Manage the ablation collection of illustrative plates of pipeline under different rush of current；
(2-9) contrasts actual ablation photo and ablation collection of illustrative plates, further adjusts simulation thunder-strike current size and repeats to test, 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, adjustment interference is electric
Pressure and time parameter, test parameters is encrypted near ablation critical value, other deviate the parameter of critical value farther out and carry out
Cut down, could so obtain more accurate result of the test.
Experiment proves：, can be by burning using influence of the simulated test facility research thunder-strike current to buried pipeline
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 influenced, and computation model is influenced on buried pipeline using numerical simulation technology structure thunder-strike current, research is each
Parameter analyzes the ablative mechanism for obtaining actual pipeline to pipeline electrical parameter affecting laws, and carries out abatement guard technology and grind
Study carefully, including：Safe distance, power grid side's safeguard procedures, pipeline side's safeguard procedures, the comprehensive abatement for obtaining high current ablation problem are anti-
Shield scheme, qualitative and quantitative helpful reference is provided for the corrosion protection of long-distance pipe.
Although the utility model is described by reference to specific illustrative embodiment, these realities will not be subject to
Apply the restriction of example and only limited be subject to accessory claim.It should be understood by those skilled in the art that can be without departing from this reality
The embodiment of the utility model can be modified and be changed with the case of new protection domain and spirit.
Claims (1)
1. a kind of simulation test special purpose device of thunder-strike current ablation pipeline, the lightning stroke 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, including single-phase voltage regulator D, testing transformer
T1, T2, high voltage silicon rectifier stack G, capacitor group C, pulse trigger H, harmonic inductance L and wave regulating resistor R, simulate the ripple of thunder-strike current
Shape is close to 8/20 μ s, interference voltage when amplitude is close to maximum interference, i.e. 100kA；
High pressure oscilloscope (2), for observing and preserving discharge current waveform；
Auxiliary electrode (3), for forming circuit of polarizing, having test specimen, electric current is small using resistance by, auxiliary electrode (3),
And polarized platinum or carbon electrode are less likely to occur；
And actual soil environment case (4), for providing actual soil environment when thunder-strike current occurs for Near Pipelines.
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| CN201721682794.XU CN207366493U (en) | 2017-12-06 | 2017-12-06 | A kind of simulation test special purpose device of thunder-strike current ablation pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485303A (en) * | 2020-12-08 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | Method and system for analyzing characteristic parameters of soil multi-impact discharge |
| 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 |
-
2017
- 2017-12-06 CN CN201721682794.XU patent/CN207366493U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485303A (en) * | 2020-12-08 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | Method and system for analyzing characteristic parameters of soil multi-impact discharge |
| CN112485303B (en) * | 2020-12-08 | 2023-08-08 | 国网四川省电力公司电力科学研究院 | Method and system for analyzing characteristic parameters of multiple impact discharge of soil |
| 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 |
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