CN107503735A - A kind of maximum run-time estimation method of deep well grounding electrode - Google Patents
A kind of maximum run-time estimation method of deep well grounding electrode Download PDFInfo
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- CN107503735A CN107503735A CN201710802482.6A CN201710802482A CN107503735A CN 107503735 A CN107503735 A CN 107503735A CN 201710802482 A CN201710802482 A CN 201710802482A CN 107503735 A CN107503735 A CN 107503735A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
Abstract
The present invention relates to a kind of maximum run-time estimation method in grounding technology field, more particularly to deep well grounding electrode.It can estimate that the research to deep well grounding electrode has directive significance to the maximum run time of deep well grounding electrode.The embodiment of the present invention provides a kind of maximum run-time estimation method of deep well grounding electrode, including：Deep well grounding electrode is reduced to endless cylinder model, and the temperature rise to the wireless oval column model carries out partition domain analysis, obtains the maximum temperature rise generation area of the deep well grounding electrode；The temperature of the maximum temperature rise generation area of the deep well grounding electrode is subjected to derivation to the time, and substitutes into maximum allowable temperature rise and calculates maximum allowable time, so as to realize the estimation to the maximum run time of the deep well grounding electrode.The embodiment of the present invention is used for the research and application of deep well grounding electrode.
Description
Technical field
The present invention relates to a kind of maximum run-time estimation method in grounding technology field, more particularly to deep well grounding electrode.
Background technology
Compared with the shallow embedding formula horizontal grounding pole of routine, deep-well grounding has the advantages that small area coverage, small investment, and
Extremely similar with horizontal grounding, it is one of key factor that needs consider when designing that temperature, which rises,.
When HVDC is operated in monopolar mode, system power circulates between every side joint earth polar and the earth, when high straightening
When stream is operated in double pole mode, grounding electrode also provides the path of balanced balanced current.These parts, especially soil, in electricity
Flow in the process of circulation, its resistivity is much larger than coke and electrode conductor, so itself can generate heat, especially for land earthing pole
For, because most of electrodes have big size, it is very long to reach time of stable state, and in view of electrode pair environment and
The influence of AC network, high-voltage direct current long-play under monopolar mode is hardly possible, and this just needs to obtain high pressure
Maximum run time of the straight-flow system under monopolar mode, and maximum run time is determined by the maximum temperature rise of earthing pole, is passed through
Design formula, which to the maximum temperature rise of the earthing pole solve, needs substantial amounts of human and material resources and financial resources, and cost is higher, unfavorable
In the research and application of deep well grounding electrode.
The content of the invention
It is a primary object of the present invention to, there is provided a kind of maximum run-time estimation method of deep well grounding electrode, can be right
The maximum run time of deep well grounding electrode is estimated that the research to deep well grounding electrode has directive significance.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
The embodiment of the present invention provides a kind of maximum run-time estimation method of deep well grounding electrode, including：
Deep well grounding electrode is reduced to endless cylinder model, and the temperature rise to the wireless oval column model carries out partition
Domain analysis, obtain the maximum temperature rise generation area of the deep well grounding electrode；
The temperature of the maximum temperature rise generation area of the deep well grounding electrode is subjected to derivation to the time, and substituted into maximum allowable
Temperature rise calculates maximum allowable time, so as to realize the estimation to the maximum run time of the deep well grounding electrode.
Optionally, deep well grounding electrode is reduced to endless cylinder model；Specifically include：
The deep well grounding electrode is replaced using unlimited long cylinder, and the end of the unlimited long cylinder is changed to half
It is spherical.
Optionally, the temperature rise to the wireless oval column model carries out partition domain analysis, specifically includes：
Endless cylinder model is divided into the unlimited long cylinder in top and end hemispherical, it is unlimited with end hemispherical and top
Diffusing and heating space are divided into two parts up and down by the plane of long cylinder intersection, and using the plane as adiabatic face, according to
The diffusing and heating rule of unlimited long cylinder are analyzed the subregional diffusing in top and heating, according to hemispheric radiating and
Heating rule is analyzed the subregional diffusing in bottom and heating.
Optionally, the maximum temperature rise generation area of the deep well grounding electrode is the region more than plane.
Optionally, the temperature of the maximum temperature rise generation area of the deep well grounding electrode is subjected to derivation, specific bag to the time
Include：
Under cylindrical-coordinate system, the Heat Conduction Differential Equations of the unlimited long cylinder in the top are established.
Optionally,
The Heat Conduction Differential Equations of the unlimited long cylinder in top are as follows：
Wherein, C is thermal capacity, and λ is thermal conductivity, and τ is the time, and T is temperature, r,Z is cylindrical coordinates, qvFor heating power.
Optionally,WithIt is zero, regards soil as isotropic medium, can obtains：
Wherein, J is the current density of any point in soil space, and ρ is resistivity.
Optionally, substitute into maximum allowable temperature rise calculating maximum allowable time to carry out under adiabatic conditions, electrode can be obtained
Surface soil temperature equation：
Wherein, J0For the current density of electrode surface.
The embodiment of the present invention provides a kind of maximum run-time estimation method of deep well grounding electrode, by the way that the deep-well is connect
Earth polar is reduced to endless cylinder model, and the temperature rise to the endless cylinder model carries out partition domain analysis, described in acquisition
The maximum temperature rise generation area of deep well grounding electrode, then pointedly to the temperature of the maximum temperature rise generation area of the deep well grounding electrode
Spend and derivation is carried out to the time, and substitute into maximum allowable temperature rise can just calculate maximum allowable time, so as to estimate
The maximum run time of deep well grounding electrode is stated, the research to the deep well grounding electrode has directive significance with application.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also be attached according to these
Figure obtains other accompanying drawings.
Fig. 1 is a kind of flow signal of the maximum run-time estimation method of deep well grounding electrode provided in an embodiment of the present invention
Figure；
Fig. 2 is a kind of wandering structural representation of electric current of deep well grounding electrode provided in an embodiment of the present invention；
Fig. 3 is provided in an embodiment of the present invention the end of deep well grounding electrode is changed into hemispheric structure to be shown based on Fig. 2
It is intended to；
Fig. 4 is a kind of structural representation of the electric current field distribution of deep well grounding electrode provided in an embodiment of the present invention；
Fig. 5 is that the adiabatic electric current in face of realistic model of regarding plane D as provided in an embodiment of the present invention based on Fig. 3 scatters
The structural representation analyzed；
Fig. 6 is that the wandering structure analyzed of the electric current to realistic model provided in an embodiment of the present invention based on Fig. 3 is shown
It is intended to.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In the description of the invention, it is to be understood that term " " center ", " on ", " under ", "front", "rear", " left side ",
The orientation or position relationship of the instruction such as " right side ", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are based on shown in the drawings
Orientation or position relationship, be for only for ease of the description present invention and simplify description, rather than instruction or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In description of the invention, unless otherwise indicated, " multiple " are meant that two or more.
The embodiment of the present invention provides a kind of maximum run-time estimation method of deep well grounding electrode, referring to Fig. 1, including：
Deep well grounding electrode is reduced to endless cylinder model by step 1), and the temperature rise to the wireless oval column model is entered
Row partition domain analysis, obtain the maximum temperature rise generation area of the deep well grounding electrode；
The temperature of the maximum temperature rise generation area of the deep well grounding electrode is carried out derivation to the time by step 2), and is substituted into most
It is big to allow temperature rise to calculate maximum allowable time, so as to realize the estimation to the maximum run time of the deep well grounding electrode.
The embodiment of the present invention provides a kind of maximum run-time estimation method of deep well grounding electrode, by the way that the deep-well is connect
Earth polar is reduced to endless cylinder model, and the temperature rise to the endless cylinder model carries out partition domain analysis, described in acquisition
The maximum temperature rise generation area of deep well grounding electrode, then pointedly to the temperature of the maximum temperature rise generation area of the deep well grounding electrode
Spend and derivation is carried out to the time, and substitute into maximum allowable temperature rise can just calculate maximum allowable time, so as to estimate
The maximum run time of deep well grounding electrode is stated, the research to the deep well grounding electrode has directive significance with application.
In one embodiment of the invention, referring to Fig. 2 and Fig. 3, deep well grounding electrode is reduced to endless cylinder model；Specifically
Including：
The deep well grounding electrode 1 is replaced using unlimited long cylinder, and the end 2 of the unlimited long cylinder is changed to
Hemispherical.
In actual applications, because the deep well grounding electrode 1 generally by feed rod and is filled in the feed rod and soil
Packing material composition between earth, wherein packing material is usually coke, also, because the resistivity of feed rod is much smaller than coke
Resistivity, can learn the feed rod heating power be much smaller than coke heating power, simultaneously as the heat of feed rod
Capacity rate is slightly larger than the thermal capacity of the coke, therefore, the feed rod on the interface of the feed rod and the coke
Certainly less than the temperature rise of the coke, heat can be from coke to the feed rod transmission for temperature rise.Can using same analysis method
To learn：On the interface of soil and the coke, maximum temperature rise occurs in the interface contacted with the deep well grounding electrode 1
Soil at, also, compared to soil for, the volume very little of feed rod and coke, so actually feed rod and Absorption of Coke
Receive the heat that passes over of soil also very little, therefore, soil can be disregarded to coke and the heat of feed rod transmission, i.e., regarding soil and
The interface of coke is adiabatic, and the entirety that the feed rod and the coke are adiabatic as one is carried out using unlimited long cylinder
Instead of resulting temperature rise value is more higher than actual temperature rise value, as a result too conservative.
And further, referring to Fig. 4, because the earth current of deep well grounding electrode 1 scatters to surrounding and depths, and earthing pole
End electric current easily scatter, therefore, on earthing pole surface, the highest current density of end 2 of earthing pole, certain limit it
Outside, CURRENT DISTRIBUTION can be close to the electric current distribution rule of dome electrode, and end 2 is at highest current density, is also simultaneously
Heating power and temperature highest point.Therefore, referring to shown in Fig. 2 and Fig. 3, by a bit, i.e., the volume of the earthing pole 1 is reduced
The coke material of a part of low-resistivity in whole current field is changed into soil, the end 2 of the earthing pole is changed to hemispherical,
Resulting temperature rise result is partially stricter than reality.
In summary, by the way that the deep well grounding electrode 1 is reduced into endless cylinder model, to the deep well grounding electrode
Temperature rise is analyzed, and resulting temperature rise result is partially stricter than actual value, so as to the maximum temperature to the deep well grounding electrode
More accurately analyzed the generation area risen.
In another embodiment of the present invention, referring to Fig. 5, the temperature rise to the endless cylinder model carries out partition domain point
Analysis, is specifically included：
The endless cylinder model is divided into the unlimited long cylinder in top and end hemispherical, it is infinitely oval with the top
Diffusing and heating space are divided into two parts region (such as Fig. 5 up and down by the plane (being designated as D) of post and the end hemispherical intersection
It is shown that the top subregion is designated as the regions of Ω 1, the bottom subregion is designated as the regions of Ω 2), and the plane D is made
For adiabatic face, the subregional diffusing in top and heating are analyzed according to the diffusing and heating rule of unlimited long cylinder, according to
Hemispheric radiating and heating rule is analyzed the subregional diffusing in bottom and heating.
Shown in Figure 6 for realistic model, electric current not only scatters to horizontal direction, can also pass through plane D to flow into
The regions of Ω 2, and when the plane D is analyzed as adiabatic face, as shown in figure 5, electric current is upper wandering only in horizontal direction, because
This, can learn：In electrode surface maximum current density under the same conditions, for the regions of Ω 1, the stream of the electric current shown in Fig. 5
Relative difficult is dissipated, heating and temperature rise are more serious, using identical analysis method, it is known that also wandering in Fig. 4 institutes representation model
The electric current of D planes is passed through in part Ω 1 regions, and in Fig. 5 institutes representation model, the only wandering dome electrode of the regional soils of Ω 2
The electric current of outflow, i.e., for the regions of Ω 2, Fig. 4 wandering relative difficult of electric current, heating and temperature rise are more serious.Assuming that earthing pole table
The current density of face everywhere is equal, then because the electric current and heat in the regions of Ω 1 shown in Fig. 4 can flow to Ω 2 through D planes
Region, therefore, the temperature rise in the regions of Ω 1 are more serious.
Based on this, it can learn in four regions shown in Fig. 5 and Fig. 6, the order of severity of temperature rise is from high to low successively
For：The regions of Ω 1 shown in the regions of Ω 1, Fig. 6, the regions of Ω 2 shown in Fig. 6 and the regions of Ω 2 shown in Fig. 5 shown in Fig. 5.Therefore,
For realistic model Fig. 6, its maximum temperature rise is less than the regions of Ω 1 described in Fig. 5, and more than the regions of Ω 2 shown in Fig. 5, that is,
Say, under conditions of extreme electrode surface current density, the actual maximum temperature rise of deep well grounding electrode is than according to the Ω 1 shown in Fig. 5
Result obtained by regional model calculates is low, higher than the result obtained by being calculated according to the regional models of Ω 2 shown in Fig. 5.
Therefore, by carrying out Simplified analysis to the endless cylinder model, it can determine that the deep well grounding electrode is maximum
The generation area of temperature rise, and the maximum temperature rise in the generation area and realistic model of identified deep well grounding electrode maximum temperature rise
Generation area it is consistent, and obtained maximum temperature rise is calculated by endless cylinder model and is higher than realistic model, it is as a result partially tight
Lattice.It can determine：The maximum temperature rise generation area of the deep well grounding electrode 1 is the region of more than the plane D, that is, schemes
The regions of Ω 1 shown in 6.
In one embodiment of the invention, the temperature of the maximum temperature rise generation area of the deep well grounding electrode is carried out to the time
Derivation, specifically include：
Under cylindrical-coordinate system, the Heat Conduction Differential Equations of the unlimited long cylinder in the top are established.
In embodiments of the present invention, can be to described by establishing the Heat Conduction Differential Equations of the unlimited long cylinder in the top
The temperature of the maximum temperature rise generation area of deep well grounding electrode carries out simplifying derivation to the derivative of time.
In another embodiment of the present invention, the Heat Conduction Differential Equations of the unlimited long cylinder in top are as follows：
Wherein, C is thermal capacity, and λ is thermal conductivity, and ρ is resistivity, and τ is the time, and T is temperature, r,Z is cylindrical coordinates, qvFor
Heating power.
Wherein, for endless cylinder electrode, temperature field is axisymmetricly distributed, therefore,
Preferably,WithIt is zero, regards soil as isotropic medium, can obtains：
Wherein, J is the current density of any point in soil space, and ρ is resistivity.
The temperature of any point in soil at any time is solved according to above formula can, here, with depth
The continuous operation of well earthing pole, when the temperature rise on the deep well grounding electrode surface reaches maximum allowable temperature rise, the corresponding time
As maximum allowable time.
Preferably, substitute into maximum allowable temperature rise calculating maximum allowable time to carry out under adiabatic conditions, electrode can be obtained
Surface soil temperature equation：
Wherein, J0For the current density of electrode surface.
Have：
Wherein, Δ τ is run time, and Δ T is corresponding temperature rise.When Δ T takes maximum allowable temperature rise, corresponding Δ τ is most
It is big to allow the time.
In summary, the invention provides a kind of evaluation method of deep well grounding electrode maximum temperature rise, by the deep-well
Earthing pole is simplified, and the temperature rise to the model after simplification carries out partition domain analysis, obtains the maximum of the deep well grounding electrode
Temperature rise generation area, by pointedly using heat transfer differential to the temperature of the maximum temperature rise generation area of the deep well grounding electrode
Equation is solved, and maximum allowable time can be calculated by maximum allowable temperature rise under adiabatic conditions, so as to institute
The maximum run time for stating deep well grounding electrode is estimated that the research to the deep well grounding electrode has directive significance with application.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of maximum run-time estimation method of deep well grounding electrode, it is characterised in that including：
Deep well grounding electrode is reduced to endless cylinder model, and the temperature rise to the wireless oval column model carries out partition domain point
Analysis, obtain the maximum temperature rise generation area of the deep well grounding electrode；
The temperature of the maximum temperature rise generation area of the deep well grounding electrode is subjected to derivation to the time, and substitutes into maximum allowable temperature rise
Maximum allowable time is calculated, so as to realize the estimation to the maximum run time of the deep well grounding electrode.
2. evaluation method according to claim 1, it is characterised in that
Deep well grounding electrode is reduced to endless cylinder model；Specifically include：
The deep well grounding electrode is replaced using unlimited long cylinder, and the end of the unlimited long cylinder is changed to hemisphere
Shape.
3. evaluation method according to claim 2, it is characterised in that
Temperature rise to the wireless oval column model carries out partition domain analysis, specifically includes：
Endless cylinder model is divided into the unlimited long cylinder in top and end hemispherical, it is infinitely oval with top with end hemispherical
Diffusing and heating space are divided into two parts up and down by the plane of post intersection, and using the plane as adiabatic face, according to unlimited
The diffusing and heating rule of long cylinder are analyzed the subregional diffusing in top and heating, according to hemispheric radiating and heating
Rule is analyzed the subregional diffusing in bottom and heating.
4. evaluation method according to claim 3, it is characterised in that
The maximum temperature rise generation area of the deep well grounding electrode is the region more than plane.
5. evaluation method according to claim 4, it is characterised in that
The temperature of the maximum temperature rise generation area of the deep well grounding electrode is subjected to derivation to the time, specifically included：
Under cylindrical-coordinate system, the Heat Conduction Differential Equations of the unlimited long cylinder in the top are established.
6. evaluation method according to claim 5, it is characterised in that
The Heat Conduction Differential Equations of the unlimited long cylinder in top are as follows：
Wherein, C is thermal capacity, and λ is thermal conductivity, and τ is the time, and T is temperature, r,Z is cylindrical coordinates, qvFor heating power.
7. evaluation method according to claim 6, it is characterised in that
WithIt is zero, regards soil as isotropic medium, can obtains：
<mrow>
<mfrac>
<mi>C</mi>
<mi>&lambda;</mi>
</mfrac>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>T</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>&tau;</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mi>r</mi>
</mfrac>
<mfrac>
<mo>&part;</mo>
<mrow>
<mo>&part;</mo>
<mi>r</mi>
</mrow>
</mfrac>
<mrow>
<mo>(</mo>
<mi>r</mi>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>T</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>r</mi>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<mo>+</mo>
<mfrac>
<mrow>
<msup>
<mi>J</mi>
<mn>2</mn>
</msup>
<mi>&rho;</mi>
</mrow>
<mi>&lambda;</mi>
</mfrac>
</mrow>
Wherein, J is the current density of any point in soil space, and ρ is resistivity.
8. evaluation method according to claim 1, it is characterised in that
Substitute into maximum allowable temperature rise calculating maximum allowable time to carry out under adiabatic conditions, the electrode surface soil moisture can be obtained
Equation：
<mrow>
<mfrac>
<mrow>
<mo>&part;</mo>
<mi>T</mi>
</mrow>
<mrow>
<mo>&part;</mo>
<mi>&tau;</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&Delta;</mi>
<mi>T</mi>
</mrow>
<mrow>
<mi>&Delta;</mi>
<mi>&tau;</mi>
</mrow>
</mfrac>
<mo>=</mo>
<mfrac>
<msub>
<mi>q</mi>
<mi>v</mi>
</msub>
<mi>C</mi>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<msubsup>
<mi>J</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mi>&rho;</mi>
</mrow>
<mi>C</mi>
</mfrac>
</mrow>
Wherein, J0For the current density of electrode surface.
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| CN104181416A (en) * | 2014-08-18 | 2014-12-03 | 国家电网公司 | Temperature rise characteristic detection method of direct-current grounding electrode |
| CN104376163A (en) * | 2014-11-12 | 2015-02-25 | 国家电网公司 | Grounding simulation method for ion grounding electrodes |
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|---|
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| CN107503735B (en) | 2020-06-30 |
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