CN107142482A - Determination and means of defence that shape high voltage DC earthing pole is disturbed buried metal works - Google Patents
Determination and means of defence that shape high voltage DC earthing pole is disturbed buried metal works Download PDFInfo
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- CN107142482A CN107142482A CN201710166610.2A CN201710166610A CN107142482A CN 107142482 A CN107142482 A CN 107142482A CN 201710166610 A CN201710166610 A CN 201710166610A CN 107142482 A CN107142482 A CN 107142482A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/04—Controlling or regulating desired parameters
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/10—Controlling or regulating parameters
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
Abstract
The invention belongs to abatement protection technology field of the shape high voltage DC earthing pole to buried metal works, and in particular to determination and means of defence that shape high voltage DC earthing pole is disturbed buried metal works.The present invention obtains the boundary condition that polarizes by scene polarization test, and calculating is modeled with reference to polarization boundary condition and relevant parameter, and Model Checking and amendment are carried out according to Site Detection data, and abatement protection Design and recruitment evaluation are carried out on the basis of correction model.This method is predicted and assessed to the HVDC annoyance level and the effect of protection Design at buried metal works entirety and details, and site of deployment polarization test improves the accuracy of prediction with Site Detection data correcting method.The type of safeguard procedures, quantity, position, size etc. are adjusted repeatedly according to model prediction result, model again is carried out after adjustment, the optimization design of safeguard procedures is realized, safeguard procedures expense is reduced, alleviates and eliminates buried metal works HVDC interference failure risk.
Description
Technical field
The invention belongs to abatement protection technology field of the shape high voltage DC earthing pole to buried metal works, and in particular to high
Determination and means of defence that pressure direct current grounding pole is disturbed buried metal works.
Background technology
China in Recent Years economic development is rapid, and to realize that the economical rationality of the energy is allocated, China develops HVDC with all strength
Power transmission network.HVDC transmission system is run when failure, maintenance frequently with monopole ground return circuit, a large amount of DC currents
The earth is entered by direct current grounding pole, to the buried metal works of surrounding formation DC stray current interference (i.e. HVDC
Interference).Shape high voltage DC earthing pole is very big to the interference damage of buried metal works, may cause buried metal works in short-term
Between internal corrosion fail.In addition, it may create higher metallic structures voltage-to-ground is poor, damage is produced to related personnel and equipment
Evil.Current China is in the high voltage direct current transmission project Large scale construction phase, and HVDC interference problem is increasingly highlighted, in China
The ground such as Guangdong, Guizhou, Sichuan, Shanghai detect different degrees of HVDC interference, it has been reported that highest interference voltage can
Up to 300V.
Because the application of high voltage direct current transmission project abroad is less, conveying grade is low, annoyance level is relatively low, therefore lack
Referential abatement safeguard procedures and design method.And domestic high voltage direct current transmission project has just put into operation mostly, to buried
The interference problem understanding of metallic structures is not enough, and the correlation technique on abatement safeguard procedures and design method is seriously deficient.This
Outside, HVDC interference has the characteristics of being different from other interference：1) annoyance level is high.Enter ground during monopole-ground return circuit operation
Electric current is concentrated in several hours or several days up to several kiloamperes, and strong concentration is produced to neighbouring buried metal works
Interference, may cause that Accelerated Corrosion Failure occurs in the metallic structures short time；2) interference size is not fixed.Meeting in electricity transmission process
Delivery is adjusted according to demand, causes earth current size not fixed, and the interference to buried metal structure can also change；3)
Interference time does not know.Direct current grounding pole monopole-ground return circuit operation has certain randomness, therefore the time that interference occurs
It is uncertain；4) interference polarity is not known.Earth current is that timing produces anode interference to neighbouring metallic structures, and earth current is
When negative metallic structures are produced with negative electrode interference, earth current is positive and negative to depend on system jam, the polar curve of maintenance, therefore right
The interference polarity of metallic structures is not known yet.These features cause the detection to HVDC annoyance level and abatement protection
The measure of merit of measure is difficult, and detecting the missing of data causes conventional stray electrical current interference mitigation protection design method
It can not apply.
On the other hand, buried metal works is influenceed by the interference of shape high voltage DC earthing pole by Multiple factors.Such as：Ground connection
Pole earth current increase, interference increase；Earthing pole reduces with metallic structures distance, interference increase；Soil resistivity is raised, and is done
Disturb increase；Earthing pole anode discharge, the movement of buried metal works near-end current potential negative sense, distal end current potential forward direction are mobile.Therefore
Think disturbed condition suffered by correct analysis buried metal works comprehensively, it is necessary to required according to site operation, construction budget, alleviation
The abatement means of defence of target design completely.
The content of the invention
Not enough for these, the present invention proposes the determination and prevent that shape high voltage DC earthing pole disturb buried metal works
Maintaining method.This method is the brand-new HVDC interference mitigation protection Design side based on numerical simulation technology combination Site Detection
Method, the safeguard procedures for rationally designing buried metal works, reduction shape high voltage DC earthing pole is to buried metal works
Interference.
The present invention is achieved by the following technical solutions：
A kind of determination method that shape high voltage DC earthing pole is disturbed buried metal works, methods described includes following step
Suddenly,
(1) Site Detection and parameter collection：The carry out on-the-spot test and collection of relevant parameter needed for calculating：Testing high voltage
When direct current grounding pole discharges, the interference parameter of buried metal works；
(2) computation model is set up：Shape high voltage DC earthing pole is joined to the interference of buried metal works with reference to on-site parameters
Number builds model, from three-dimensional prediction Different field parameter to shadow of the shape high voltage DC earthing pole to the interference of buried metal works
Ring.
Further, methods described also includes：(3) correction model：The model built according to step (2), using boundary element
Method solves Laplace equations and calculates metallic structures interference parameter；By the model calculation and step (1) fieldtesting results pair
Than；If result of calculation and fieldtesting results deviation are more than parameter in 10%, correction model, until result of calculation and on-the-spot test
As a result maximum deviation obtains revised model no more than 10%, that is, determines that shape high voltage DC earthing pole is dry to buried metal works
Disturb.
Further, the on-site parameters include polarization condition, the shape high voltage DC earthing pole of metallic structures/Soil Interface
Relative position relation, shape high voltage DC earthing pole running parameter, buried metal works parameter between buried metal works.
Further, the polarization condition of the metallic structures/Soil Interface is obtained by scene polarization test；
The scene polarization test is specifically, under the soil environment residing for buried metal works, utilize the test piece that polarizes
The polarization curve of test polarization test piece.
Further, the material of the polarization test piece is identical with the material of the buried metal works.
Further, it is characterised in that in step (1) during Site Detection test position include metallic structures along it is close
Direct current grounding pole position, termination and the discontinuous position of electric power.
Further, it is characterised in that the shape high voltage DC earthing pole running parameter includes：Rated operational current is uneven
Weigh electric current, monopole ground return circuit run time, bipolar ground return circuit run time, and shape high voltage DC earthing pole soil electricity nearby
Resistance rate is distributed.
Further, it is characterised in that the buried metal works parameter includes：Pipeline longitudinal impedance, anticorrosive coat electricity
Resistance rate, anticorrosive coat breakage rate.
Further, it is characterised in that use Boundary Element Method Laplace equations specifically, making with Laplace equations
For Potential distribution descriptive equation, boundary condition is supplemented and limitation obtains fixed solution i.e. metallic structures interference parameter；
The boundary condition includes mitigation strategy boundary condition, metallic structures boundary condition, cathodic protection system border
Condition and shape high voltage DC earthing pole；
The Laplace equations are：
Mitigation strategy boundary condition is：
Metallic structures boundary condition：
Cathodic protection system boundary condition：
OrOr
Shape high voltage DC earthing pole：
Wherein,
Partial differential calculates symbol；σ soil conductivities；The current potential of any point in Φ computational fields；
X is x directions coordinate；Y is y directions coordinate；Z is z directions coordinate；
Im alleviates the current density on groundbed, A/m2；Im0 alleviates the exchange current density of groundbed, A/m2；Ic metal structures
Current density on thing, A/m2；ic0Exchange current density on metallic structures, A/m2；ia0Exchanging electric current on sacrificial anode
Density, A/m2；iaCurrent density on sacrificial anode, A/m2；ia1Constant current protects the current density of system, A/m2；ieHigh straightening
Flow the current density of earthing pole, A/m2；
ρ resistivity of media, Ω m；
φmAlleviate arbitrfary point current potential, V on groundbed；φaeqReaction equilibrium potential on sacrificial anode, V；φmeqAlleviate groundbed
Reaction equilibrium potential, V；φceqReaction equilibrium potential on metallic structures, V；φaArbitrfary point current potential on sacrificial anode,
V；φ a1 constant currents protect the arbitrfary point current potential of system, V；The arbitrfary point current potential of φ e shape high voltage DC earthing poles, V；
Nm alleviates groundbed unit normal vector, m；Unit normal vector on nc metallic structures, m；List on na sacrificial anodes
Position normal vector；Na1 constant currents protect the unit normal vector of system, m；The unit normal vector of ne shape high voltage DC earthing poles, m；
Fm functional relation symbols；Fc functional relation symbols；Fa functional relation symbols.
Further, the interference parameter of the buried metal works includes the energization electricity of buried metal works/soil
Position, switch-off potential, ground potential gradient, the current density of buried metal works, longitudinal current.
The means of defence that a kind of shape high voltage DC earthing pole is disturbed buried metal works, methods described is according to above-mentioned determination
The amended model that method is obtained；The means of defence is further comprising the steps of：
(5) objective of defense is determined：Using revised model, shape high voltage DC earthing pole is calculated to buried metal structure produce
Raw interference potential and current density, on this basis with reference to risk classifications, specify the safety limit of various risks, formulate and alleviate
The objective of defense；
(6) protection Design：Alleviate the objective of defense using revised models coupling and determine means of defence.
Further, the means of defence also includes：
(7) means of defence determined using step (5) is predicted to protection effect, with reference to live practice of construction condition,
The parameters such as the type of safeguard procedures, quantity, position, size are adjusted repeatedly；
(8) repeat step (5) is arranged until obtaining and meeting the alleviation objective of defense, economical and effective and the protection with exploitativeness
Apply.
Further, the type of the safeguard procedures includes：Insulating joint, forced drainage system, single-phase drainage groundbed, water
It is flat zinc band groundbed, distributed groundbed, deepwell ground bed, grounded screen groundbed, shielding band, built on stilts.
The advantageous effects of the present invention：
The inventive method includes site environment, is disturbed the detection such as metallic structures current potential and utilizes boundary element Numerical-Mode
Intend software to scene interference simulated, forecast assessment, alleviate design, alleviate optimize etc..In order to ensure abatement means of defence
Authenticity, integrality, the field data being collected into (soil information, earthing pole parameter, metallic structures parameter etc.) is true
Reflection into numerical simulator.In order to ensure cutting down the accuracy of means of defence, boundary Element Numerical Simulation software pair is utilized
Above-mentioned model carries out interference calculation, and is compared with Site Detection current potential, electric current, and school is completed by constantly adjusting on-site parameters
Core.In order to ensure cutting down the security of means of defence, using boundary Element Numerical Simulation software to shape high voltage DC earthing pole to buried
The annoyance level of metallic structures carries out simulation and forecast, obtains the leakage current density of metallic structures under specified earth current,
Voltage difference between works and the earth, and metallic structures thing internal current total amount.In order to ensure abatement means of defence
Validity, according to the different mitigation scheme of above-mentioned disturbance-proof design of the maximum earth current to metallic structures, including：Lay zinc
Band, embedded deep-well, laying grounded screen, set it is front-seat, insulating joint etc. is set, reach alleviation target.
Mesohigh direct current grounding pole of the present invention has filled up mesh to the abatement protection design method that buried metal works is disturbed
Preceding domestic shape high voltage DC earthing pole interference mitigation protects the blank in field, and accuracy is high, and feasibility is strong.For ensuring high straightening
The safety of buried metal works has very important significance near stream earthing pole.
Brief description of the drawings
The means of defence flow frame diagram that Fig. 1, the shape high voltage DC earthing pole of embodiment 1 are disturbed buried metal works；
Fig. 2, the model schematic that embodiment 1 is built；
Result of calculation before and after live polarization characteristic described herein is used in Fig. 3, embodiment 3；
Result of calculation before and after live polarization characteristic described herein is used in Fig. 4, embodiment 4.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiied
Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
Embodiment 1
The determination that shape high voltage DC earthing pole is disturbed buried metal works：
1) typical environment along the neighbouring metallic structures of selection shape high voltage DC earthing pole, such as：Farmland, sand ground, mountain region etc., enter
The polarization test of row scene, obtains polarization boundary condition of the metallic structures under actual condition；
2) showed along metallic structures close to direct current grounding pole position, termination and the discontinuous position of electric power
Field detection.When testing direct current grounding pole electric discharge, buried metal works interference parameter, such as：Works/soil energization current potential and disconnected
Electric potential, ground potential gradient etc.；
3) collect relative position relation between shape high voltage DC earthing pole and pipeline, shape high voltage DC earthing pole running parameter,
Metallic structures basic data.The polarization boundary condition measured with reference to scene, with reference to polarization characteristic to shape high voltage DC earthing pole pair
The annoyance level of buried metal works is modeled prediction, including：Shape high voltage DC earthing pole is modeled, and buried metal works is built
Mould and soil texture modeling；
4) according to shape high voltage DC earthing pole operational factor during Site Detection, calculate metallic structures interference using model and join
Number, such as：Works/soil energization current potential and switch-off potential, ground potential gradient etc..By the model calculation and fieldtesting results
(works/soil current potential, ground potential gradient) is contrasted, and then adjusts correction model relevant parameter, such as：Anticorrosive coat is damaged
Rate, soil texture etc., repeat step 3) calculated, until result of calculation is no more than with fieldtesting results maximum deviation
10%；
Further carry out the protection that shape high voltage DC earthing pole is disturbed buried metal works：
5) risk that analysis shape high voltage DC earthing pole may be produced to buried metal works, such as：Metal erosion, hydrogen embrittlement,
Anticorrosive coating peeling, personal safety, equipment safety, fire hidden danger etc..The safety limit of various risks is specified, is formulated on this basis
Alleviate the objective of defense；
6) the revised models coupling of application alleviates objective of defense progress protection Design, and protection effect is predicted.
The effect after a variety of safeguard procedures integrated uses is simulated, such as：Forced drainage, directional drainage, graded insulation, horizontal zinc band, ground connection
Net, deep-well grounding, distributed ground connection etc..
7) predicted the outcome and live practice of construction condition according to protection effect, to the type, quantity, position of safeguard procedures
Put, the parameter such as size is adjusted repeatedly.Repeat step 6) alleviate the objective of defense, economical and effective and with can until obtaining and meeting
The safeguard procedures of implementation.
8) according to step 7) the optimization protection Design parameter that is obtained, shape high voltage DC earthing pole is completed to buried metal structure
The protection Design drawing of thing.
Wherein, the model of structure is the polarization condition of combination metallic structures/Soil Interface, shape high voltage DC earthing pole and buries
Relative position relation, shape high voltage DC earthing pole running parameter, buried metal works parameter between ground metallic structures are built
Threedimensional model, as shown in Figure 2.
Boundary Element Method Laplace equations are used specifically, using Laplace equations as Potential distribution descriptive equation,
Boundary condition is supplemented and limitation obtains the fixed i.e. metallic structures interference parameter of solution；Element BEM seeks the process that equation is solved surely：
In domain (such as：Soil domain)：Laplace equations, by weighted residual method or green theorem, are converted to borderline integration side
Journey, Nonlinear System of Equations is converted to by mesh generation, is calculated by alternative manner and is obtained borderline current potential and current density
Distribution.
The boundary condition includes mitigation strategy boundary condition, metallic structures boundary condition, cathodic protection system border
Condition and shape high voltage DC earthing pole boundary condition；
The Laplace equations are：
Mitigation strategy boundary condition is：
Metallic structures boundary condition：
Cathodic protection system boundary condition：
OrOr
Shape high voltage DC earthing pole boundary condition：
Wherein,
Partial differential calculates symbol；σ soil conductivities；The current potential of any point in Φ computational fields；
X is x directions coordinate；Y is y directions coordinate；Z is z directions coordinate；
Im alleviates the current density on groundbed, A/m2；Im0 alleviates the exchange current density of groundbed, A/m2；Ic metal structures
Current density on thing, A/m2；ic0Exchange current density on metallic structures, A/m2；ia0Exchanging electric current on sacrificial anode
Density, A/m2；iaCurrent density on sacrificial anode, A/m2；ia1Constant current protects the current density of system, A/m2；ieHigh straightening
Flow the current density of earthing pole, A/m2；
ρ resistivity of media, Ω m；
φmAlleviate arbitrfary point current potential, V on groundbed；φaeqReaction equilibrium potential on sacrificial anode, V；φmeqAlleviate groundbed
Reaction equilibrium potential, V；φceqReaction equilibrium potential on metallic structures, V；φaArbitrfary point current potential on sacrificial anode,
V；φ a1 constant currents protect the arbitrfary point current potential of system, V；The arbitrfary point current potential of φ e shape high voltage DC earthing poles, V；
Nm alleviates groundbed unit normal vector, m；Unit normal vector on nc metallic structures, m；List on na sacrificial anodes
Position normal vector；Na1 constant currents protect the unit normal vector of system, m；The unit normal vector of ne shape high voltage DC earthing poles, m；
Fm functional relation symbols；Fc functional relation symbols；Fa functional relation symbols.
Embodiment 2
One oil pipeline and shape high voltage DC earthing pole are close to each other.Shape high voltage DC earthing pole and pipeline vertical range 3km.
Field Research result, which is shown along oil pipeline, mainly three kinds of soil environments, farmland soil, laterite and mountain region.
The determination that shape high voltage DC earthing pole is disturbed buried metal works：
(1) polarization test piece is made using with the steel of pipeline phase same material, the test polarization test piece in these three soil
Polarization curve.
(2) HVDC is detected close to direct current grounding pole position and two ends arrangement the CP potential test device in pipeline
When earthing pole discharges, the energization current potential of pipeline/soil.
(3) collect relative position relation between shape high voltage DC earthing pole and pipeline, shape high voltage DC earthing pole running parameter,
Metallic structures basic data.Three-dimensional modeling is carried out using numerical simulation software (BEASY), and by the pipe under different soils environment
Section assigns corresponding polarization boundary condition.
(4) when calculating direct current grounding pole electric discharge using numerical simulation software simulation, pipeline/soil at pipeline test position
Energization current potential.
As a result show, result of calculation is than measured result bigger by 15%.Adjust after anticorrosive coat breakage rate, result of calculation and actual measurement
Result error is less than 10%, and the shape high voltage DC earthing pole determined is disturbed buried metal works.
Further carry out the protection that shape high voltage DC earthing pole is disturbed buried metal works：
(5) by analyzing the main risk of oil pipeline for metal erosion and personal safety.According to this two classes risk, it is determined that
Alleviate the objective of defense, such as：Pipeline/soil energization current potential limit value.
(6) Preliminary design is carried out for above-mentioned interference.(it is less than because annoyance level suffered by result of calculation display pipes is relatively low
65VCSE), non-transformer along pipeline, along the line valve chamber can increase insulating joint, therefore using graded insulation, horizontal zinc band and sacrifice
Three kinds of measures of anode are integrated using being protected.
The location arrangements insulating joint for being zero in pipeline/soil energization current potential, sacrificial anode is arranged in insulating joint both sides,
Horizontal zinc band is arranged in the maximum position (pipe ends and the position nearest with direct current grounding pole) of interference.Utilize numerical simulation
Software carries out simulation calculating to safeguard procedures, predicts protection effect.As a result show, the anti-of formulation can not be met under the safeguard procedures
Eye protection mark.
(7) length and quantity, the optimization insulating joint position of horizontal zinc band are adjusted, numerical simulation software progress is reused
Modeling Calculation, predicts protection effect.As a result show that the measure after adjustment disclosure satisfy that the objective of defense of formulation.
(8) position of horizontal zinc band and insulating joint is adjusted according to field condition.And horizontal zinc band is adjusted according to economy
Length and quantity.Alleviation protection parameter after being optimized.
(9) according to the optimization protection Design parameter obtained, shape high voltage DC earthing pole is completed to buried metal works
Protection Design drawing.
After the completion of engineering site mitigation strategy construction, pipe to soil potential is checked simultaneously along pipeline when discharging earthing pole
It is basically identical with design calculation result, illustrate that the means of defence can be used for actual production.
Embodiment 3
Certain oil pipeline and shape high voltage DC earthing pole are close to each other.Shape high voltage DC earthing pole and pipeline vertical range
31.8km, duct length 100km, earthing pole discharge current 3000A.
Using the on-the-spot test polarization curve result of calculation described in this patent and without using polarization characteristic result of calculation and
Field measurement pipeline current potential Comparative result is as shown in Figure 3.As seen from Figure 3, consider using described in this patent under pipeline actual condition
Polarization characteristic method can improve the degree of accuracy of result of calculation.
Embodiment 4
Certain gas pipeline and shape high voltage DC earthing pole are close to each other.Shape high voltage DC earthing pole and pipeline vertical range
18.5km, duct length 200km, earthing pole discharge current 1500A.
Using the Site Detection parameter result of calculation described in this patent and without using Site Detection parameter result of calculation and
Field measurement pipeline polarization potential Comparative result is as shown in Figure 4.From fig. 4, it can be seen that using the Site Detection data described in this patent
Calibration method can improve the degree of accuracy of result of calculation.
Claims (10)
1. a kind of determination method that shape high voltage DC earthing pole is disturbed buried metal works, it is characterised in that methods described bag
Include following steps,
(1) Site Detection and parameter collection：The carry out on-the-spot test and collection of relevant parameter needed for calculating；
(2) computation model is set up：With reference to on-site parameters to interference parameter structure of the shape high voltage DC earthing pole to buried metal works
Established model, the influence from three-dimensional prediction Different field parameter to shape high voltage DC earthing pole to the interference of buried metal works；
The on-site parameters include polarization curve, shape high voltage DC earthing pole and the buried metal knot of metallic structures/Soil Interface
Relative position relation, shape high voltage DC earthing pole running parameter, buried metal works parameter between structure thing.
2. the determination method that shape high voltage DC earthing pole as claimed in claim 1 is disturbed buried metal works, it is characterised in that
The polarization curve of the metallic structures/Soil Interface is obtained by scene polarization test；
The scene polarization test is specifically, under the soil environment residing for buried metal works, utilize the test piece test that polarizes
The polarization curve of polarization test piece.
3. the determination method that shape high voltage DC earthing pole as claimed in claim 1 is disturbed buried metal works, it is characterised in that
The determination method also includes step (3) correction model：The model built according to step (2), using Boundary Element Method
Laplace equations calculate metallic structures interference parameter；The model calculation and step (1) fieldtesting results are contrasted；If
Result of calculation and fieldtesting results deviation are more than parameter in 10%, correction model, until result of calculation and fieldtesting results
Maximum deviation obtains revised model no more than 10%, that is, determines that shape high voltage DC earthing pole is disturbed buried metal works.
4. the determination method that shape high voltage DC earthing pole as claimed in claim 2 is disturbed buried metal works, it is characterised in that
The material of the polarization test piece is identical with the material of the buried metal works.
5. the determination method that shape high voltage DC earthing pole as claimed in claim 1 is disturbed buried metal works, it is characterised in that
Test position is included along metallic structures close to direct current grounding pole position, termination and electric power during Site Detection in step (1)
Discontinuous position.
6. the determination method that shape high voltage DC earthing pole as claimed in claim 3 is disturbed buried metal works, it is characterised in that
Boundary Element Method Laplace equations are used specifically, being used as Potential distribution descriptive equation, boundary condition using Laplace equations
To supplement and limitation obtains the fixed i.e. metallic structures interference parameter of solution；
The boundary condition includes mitigation strategy boundary condition, metallic structures boundary condition, cathodic protection system boundary condition
And shape high voltage DC earthing pole；
The Laplace equations are：
Mitigation strategy boundary condition is：
Metallic structures boundary condition：
Cathodic protection system boundary condition：
OrOr
Shape high voltage DC earthing pole：
Wherein,
Partial differential calculates symbol；σ soil conductivities；The current potential of any point in Φ computational fields；
X is x directions coordinate；Y is y directions coordinate；Z is z directions coordinate；
Im alleviates the current density on groundbed, A/m2；Im0 alleviates the exchange current density of groundbed, A/m2；On ic metallic structures
Current density, A/m2；ic0Exchange current density on metallic structures, A/m2；ia0Exchange current density on sacrificial anode,
A/m2；iaCurrent density on sacrificial anode, A/m2；ia1Constant current protects the current density of system, A/m2；ieHVDC connects
The current density in earth polar, A/m2；
ρ resistivity of media, Ω m；
φmAlleviate arbitrfary point current potential, V on groundbed；φaeqReaction equilibrium potential on sacrificial anode, V；φmeqAlleviate the anti-of groundbed
Answer equilibrium potential, V；φceqReaction equilibrium potential on metallic structures, V；φaArbitrfary point current potential on sacrificial anode, V；φ
A1 constant currents protect the arbitrfary point current potential of system, V；The arbitrfary point current potential of φ e shape high voltage DC earthing poles, V；
Nm alleviates groundbed unit normal vector, m；Unit normal vector on nc metallic structures, m；Per unit system on na sacrificial anodes
Vector；Na1 constant currents protect the unit normal vector of system, m；The unit normal vector of ne shape high voltage DC earthing poles, m；
Fm functional relation symbols；Fc functional relation symbols；Fa functional relation symbols.
7. the determination method that the shape high voltage DC earthing pole as described in claim 1-6 is any is disturbed buried metal works, it is special
Levy and be, it is preferable that the shape high voltage DC earthing pole running parameter includes：Rated operational current, out-of-balance current, monopole the earth
The soil resistivity distribution nearby of loop run time, bipolar ground return circuit run time, and shape high voltage DC earthing pole；
Preferably, the interference parameter of the buried metal works includes the energization current potential of buried metal works/soil, power-off
Current potential, ground potential gradient, the current density of buried metal works, longitudinal current；
Preferably, the buried metal works parameter includes：Pipeline longitudinal impedance, anti-corrosion layer resistivity, anticorrosive coat breakage rate.
8. the means of defence that a kind of shape high voltage DC earthing pole is disturbed buried metal works, it is characterised in that methods described according to
The amended model obtained according to determination method as claimed in claim 1；The means of defence is further comprising the steps of：
(5) objective of defense is determined：Using revised model, calculate what shape high voltage DC earthing pole was produced to buried metal works
Interference potential and current density, on this basis with reference to risk classifications, specify the safety limit of various risks, formulate and alleviate protection
Target；
(6) protection Design：Alleviate the objective of defense using revised models coupling and determine means of defence.
9. the means of defence that shape high voltage DC earthing pole as claimed in claim 8 is disturbed buried metal works, it is characterised in that
The means of defence also includes：
(7) means of defence determined using step (5) is predicted to protection effect, with reference to live practice of construction condition, to anti-
The parameters such as type, quantity, position, the size of shield measure are adjusted repeatedly；
(8) repeat step (5) alleviates the objective of defense, economical and effective and the safeguard procedures with exploitativeness until obtaining and meeting.
10. the means of defence that the shape high voltage DC earthing pole as described in claim 8 or 9 is disturbed buried metal works, its feature
It is, the type of the safeguard procedures includes：Insulating joint, forced drainage system, single-phase drainage groundbed, horizontal zinc band groundbed,
It is distributed groundbed, deepwell ground bed, grounded screen groundbed, shielding band, built on stilts.
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| CN107805816A (en) * | 2017-10-25 | 2018-03-16 | 中国石油工程建设有限公司 | A kind of automatic frequency-conversion cathodic protection station prosecutor method for being used to suppress subway DC influence |
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| CN107893231B (en) * | 2017-11-20 | 2019-11-12 | 中国能源建设集团广东省电力设计研究院有限公司 | The means of defence of limitation direct current grounding pole corrosion buried metal pipeline and buried system |
| CN110470723A (en) * | 2019-03-18 | 2019-11-19 | 中国电力科学研究院有限公司 | A kind of buried metal pipeline DC influence of protective layer breakage determines method |
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| CN109868481A (en) * | 2019-03-22 | 2019-06-11 | 中国石油天然气集团公司 | The means of defence that oil-gas pipeline is interfered by HVDC transmission line earthing pole location |
| CN115595589A (en) * | 2022-11-11 | 2023-01-13 | 中国电力科学研究院有限公司（Cn） | Method and system for determining self-adaptive control bidirectional output high-power cathode protection power supply |
| CN115595589B (en) * | 2022-11-11 | 2023-08-11 | 中国电力科学研究院有限公司 | Method and system for determining self-adaptive control bidirectional output high-power cathode protection power supply |
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