CN108020725A - A kind of earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value - Google Patents
A kind of earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value Download PDFInfo
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- CN108020725A CN108020725A CN201711250002.6A CN201711250002A CN108020725A CN 108020725 A CN108020725 A CN 108020725A CN 201711250002 A CN201711250002 A CN 201711250002A CN 108020725 A CN108020725 A CN 108020725A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/20—Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
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Abstract
The present invention provides the earth mat impulse earthed resistance measuring method under the influence of a kind of different soils acid-base value, and each step of this method is respectively：1) tested tower grounding net situation is investigated, 2) build soil acidity or alkalinity near shaft tower earth mat according to field working conditions and test system, 3) the tested grounded screen surrounding soil acid-base value distribution situation of reconnaissance detection, 4) data of each measurement point are calculated to overall impulse earthed resistance weighing factor, 5) according to test point soda acid degrees of data, shaft tower earth mat is calculated and is considering the impulse earthed resistance of earth mat acid-base value distribution.The present invention effectively can accurately be calculated the situation of earth mat impulse earthed resistance under different pH values, can effectively judge shaft tower by circuit operating status when being struck by lightning by the calculating to impulse earthed resistance according to actual condition；Test platform is easy to arrange, easy and effective, suitable for different operating modes.
Description
Technical field
The present invention relates to electric system lightning protection and ground connection field, influenced more particularly, to a kind of different soils acid-base value
Under earth mat impulse earthed resistance measuring method.
Background technology
The safe operation of shaft tower and its lightning protection characteristic relation are very close in transmission system, and the impact of tower grounding device is special
Property will directly affect its lightning protection effect.The impact characteristics of tower grounding device refer mainly to lightning current by earthing or grounding means to big around
The feature of ground diffusing, in this transient process, the impulse earthed resistance and transient state ground potential of earthing or grounding means would generally raise, lightning stroke
When tower top current potential determined by the impulse earthed resistance of electric power line pole tower earthing or grounding means, so that line insulator string institute will be influenced
The overvoltage and counterattack probability of flashover received.The impulse earthed resistance of power plant and grounding net of transformer substation cross senior general produce it is larger temporary
State ground potential liter, will also threaten the safety of equipment and personnel when serious.Therefore, in order to ensure power system security reliability service with
And relevant device, the safety of personnel, it is desirable to which electric system has a good ground connection impact characteristics, accurate evaluation and is effectively improved
The impact characteristics of earthing or grounding means just become the target that related researcher constantly pursues.
Now some researches show that the change of grounded screen surrounding soil acid-base value produces directly impulse grounding resistance of electric power system
Influence.If the impulse earthed resistance value of earthing or grounding means during the soil acidity or alkalinity change of energy accurate evaluation, just can be in different soils acid
Ground connection impact characteristics are effectively improved under basicity environment, reduce the generation of counterattack accident, ensure the safe and stable operation of electric system.
The present invention is tightly bonded intelligent monitoring direction, and exploitation is a set of to detect existing shaft tower surrounding soil acid-base value and calculate acid-base value point
The system and corresponding computational methods that cloth influences impulse earthed resistance, so as to can also promote power grid efficiently to construct, promote intelligence
The fast construction of power grid.Apparatus of the present invention can measure the acid-base value distribution of grounded screen surrounding soil in real time, and by substantial amounts of real
Test, emulate and corresponding theory deduction draws the computational methods and calculation formula of impulse earthed resistance, can real-time and accurately assess
Impulse earthed resistance value, necessary data are provided to be effectively improved the impact characteristics of earthing or grounding means.
The content of the invention
The present invention provides the earth mat impulse earthed resistance measurement side under the influence of a kind of different soils acid-base value accurate in real time
Method.
In order to reach above-mentioned technique effect, technical scheme is as follows：
A kind of earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value, comprises the following steps：
S1：Live pilot investigation；
S2：Choose measurement point and assemble combined experimental device；
S3：The region division and weight distribution of measurement point；
S4：Signal processor carries out parameters revision；
S5：Impulse earthed resistance is calculated.
Further, the process of the step S1 is：
Grounded screen related physical quantity is measured, measuring shaft tower, nearby soil resistivity is ρ, and grounded screen sectional area is
S1, four skirt of grounded screen into rectangular area be S2, grounded screen buried depth is H, and grounded screen longest edge length is L1, and thunder and lightning punching
It is I to hit electric currentm。
Further, the process of the step S2 is：
Nine points are chosen in grounded screen as measurement point, wherein the four of grounded screen apex angle is respectively 1, at 2,3,4 points；Connect
Following midpoint is respectively 5,6 points on earth mat；Grounded screen left and right side midpoint is respectively 7,8 points；Grounded screen central point is 9 points, and PH is passed
Sensor buried depth is 0.8H, and each sensor measures the pH value of corresponding points, and the data collected are passed by signal transmssion line
Enter PH acquisition modules, which carries out Macro or mass analysis to data, can obtain the real-time pH value x of nine test pointsi, wherein i=
0,1,9, PH acquisition modules by coaxial cable by each pH value input signal analysis processor, signal processing
Device is connected to terminal upper computer by coaxial cable again.
Further, the process of the step S3 is：
The pH value and change in resistance of measurement point 1,2,3,4 can be considered identical in allowable range of error；Measurement point 5,6 exists
It can be considered in allowable range of error identical；Measurement point 7,8 can be considered identical in allowable range of error；9 points separately as one
Measurement point, draws 1, and 2,3,4 points account for overall electrical resistance weight and are respectively：
5,6 points jointly shared weight be：
7,8 points jointly shared weight be：
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635；
Weight shared by 9 points is：
w4=-1.665*S2 0.1751+log(S2 0.4477+S2 0.8+4.931)。
Further, the process of the step S4 is：
The correction factor that lightning current is calculated is：
Grounded screen Area modificatory coefficient is：
Soil resistivity correction factor is：
Further, the process of the step S5 is：
Order
Impulse earthed resistance is：
Compared with prior art, the beneficial effect of technical solution of the present invention is：
The present invention discloses the earth mat impulse earthed resistance measuring method under the influence of a kind of different soils acid-base value, and this method is each
Step is respectively：1) investigate tested tower grounding net situation, 2) soil acidity or alkalinity near shaft tower earth mat is built according to field working conditions
Test system, 3) the tested grounded screen surrounding soil acid-base value distribution situation of reconnaissance detection, 4) number of each measurement point is calculated
According to overall impulse earthed resistance weighing factor, 5) according to test point soda acid degrees of data, shaft tower earth mat is calculated and is considering ground
The impulse earthed resistance of net acid-base value distribution.Different pH values effectively can be accurately calculated according to actual condition in the present invention
The situation of lower earth mat impulse earthed resistance, can effectively judge shaft tower when by being struck by lightning by the calculating to impulse earthed resistance
Circuit operating status；Test platform is easy to arrange, easy and effective, suitable for different operating modes.
Brief description of the drawings
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is earth mat information and moisture measurement point distribution map in the present invention；
The system that Fig. 3 is carried by the method for the present invention.
Embodiment
Attached drawing is only for illustration, it is impossible to is interpreted as the limitation to this patent；
In order to more preferably illustrate the present embodiment, some components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be appreciated that some known features and its explanation, which may be omitted, in attached drawing
's.
Technical scheme is described further with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, the earth mat impulse earthed resistance measuring method under the influence of a kind of different soils acid-base value, including it is following
Step：
The first step：Live pilot investigation
Nearby soil resistivity ρ is 200 Ω m to selection shaft tower, and grounded screen longest edge length L1 is 20m, grounded screen section
Product S1 is 25* π mm2, four skirt of grounded screen into rectangular area S2 be 100m2Region as test zone.
Second step：Choose measurement point and assemble combined experimental device
Nine points are chosen in grounded screen as measurement point, wherein the four of grounded screen apex angle is respectively 1, at 2,3,4 points；Connect
Following midpoint is respectively 5,6 points on earth mat；Grounded screen left and right side midpoint is respectively 7,8 points；Grounded screen central point is 9 points.PH is passed
Sensor buried depth is 0.8H, and each sensor measures the pH value of corresponding points, and the data collected are passed by signal transmssion line
Enter PH acquisition modules 10, which carries out Macro or mass analysis to data, can obtain the real-time pH value of nine test points, is respectively x1
=5.8, x2=6.3, x3=6.6, x4=6.3, x5=6.0, x6=6.4, x7=6.0, x8=6.4, x9=6.2, PH acquisition module
By coaxial cable 13 by each pH value input signal analysis processor 11, signal processor is connected by coaxial cable 14 again
To terminal upper computer 12.
3rd step：The region division and weight distribution of measurement point
The pH value and change in resistance of measurement point 1,2,3,4 can be considered identical in allowable range of error；Measurement point 5,6 exists
It can be considered in allowable range of error identical；Measurement point 7,8 can be considered identical in allowable range of error；9 points separately as one
Measurement point.
1,2,3,4 points account for overall electrical resistance weight and are jointly：
5,6 points jointly shared weight be：
7,8 points jointly shared weight be：
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635；
Weight shared by 9 points is：
w4=-1.665*S2 0.1751+log(S2 0.4477+S2 0.8+4.931)；
By X1=5.8, X2=6.3, X3=6.6, X4=6.3, X5=6.0, X6=6.4, X7=6.0, X8=6.4, X9=
6.2 bring weight w into respectively1、w2、w3、w4Calculation formula, is calculated w1=0.008475, w2=0.1704, w3=0.19955,
w4=0.2336.
4th step：Signal processor carries out parameters revision
The correction factor of lightning current is：
Grounded screen Area modificatory coefficient is：
Soil resistivity correction factor is：
5th step：Impulse earthed resistance is calculated
The data needed according to being obtained in host computer：k1, k2, k3, the pH value (X of each measurement point1=5.8, X2=6.3, X3
=6.6, X4=6.3, X5=6.0, X6=6.4, X7=6.0, X8=6.4, X9=6.2), and four regions weight w1=
0.008475、w2=0.1704, w3=0.19955, w4=0.2336.
According to the following formula：
Impulse earthed resistance R is calculatedch=2.6616 Ω.
The same or similar label correspond to the same or similar components；
Position relationship is used for only for illustration described in attached drawing, it is impossible to is interpreted as the limitation to this patent；
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (6)
1. the earth mat impulse earthed resistance measuring method under the influence of a kind of different soils acid-base value, it is characterised in that including following
Step：
S1：Live pilot investigation；
S2：Choose measurement point and assemble combined experimental device；
S3：The region division and weight distribution of measurement point；
S4：Signal processor carries out parameters revision；
S5：Impulse earthed resistance is calculated.
2. the earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value according to claim 1, it is special
Sign is that the process of the step S1 is：
Grounded screen related physical quantity is measured, measuring shaft tower, nearby soil resistivity is ρ, and grounded screen sectional area is S1, ground connection
Four skirt of net into rectangular area be S2, grounded screen buried depth is H, and grounded screen longest edge length is L1, and lightning impulse current is
Im。
3. the earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value according to claim 2, it is special
Sign is that the process of the step S2 is：
Nine points are chosen in grounded screen as measurement point, wherein the four of grounded screen apex angle is respectively 1, at 2,3,4 points；Grounded screen
Upper following midpoint is respectively 5,6 points；Grounded screen left and right side midpoint is respectively 7,8 points；Grounded screen central point is 9 points, PH sensor
Buried depth is 0.8H, and each sensor measures the pH value of corresponding points, and the data collected are passed to PH by signal transmssion line
Acquisition module, the device carry out Macro or mass analysis to data, can obtain the real-time pH value x of nine test pointsi, wherein i=0,
1,9, PH acquisition modules by coaxial cable by each pH value input signal analysis processor, signal processor
Terminal upper computer is connected to by coaxial cable again.
4. the earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value according to claim 3, it is special
Sign is that the process of the step S3 is：
The pH value and change in resistance of measurement point 1,2,3,4 are considered as identical in allowable range of error；Measurement point 5,6 permits in error
Perhaps it is considered as in the range of identical；Measurement point 7,8 is considered as identical in allowable range of error；9 points, separately as a measurement point, draw
1,2,3,4 points account for overall electrical resistance weight and are respectively：
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5,6 points jointly shared weight be：
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7,8 points jointly shared weight be：
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635；
Weight shared by 9 points is：
w4=-1.665*S2 0.1751+log(S2 0.4477+S2 0.8+4.931)。
5. the earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value according to claim 4, it is special
Sign is that the process of the step S4 is：
The correction factor that lightning current is calculated is：
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Soil resistivity correction factor is：
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6. the earth mat impulse earthed resistance measuring method under the influence of different soils acid-base value according to claim 5, it is special
Sign is that the process of the step S5 is：
Order
Impulse earthed resistance is：
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| CN108761208A (en) * | 2018-08-13 | 2018-11-06 | 西南交通大学 | A kind of test method of vertical demixing soil dynamic resistance |
| CN108872709A (en) * | 2018-08-13 | 2018-11-23 | 西南交通大学 | A kind of different moisture content lower leaf soil dynamic electric resistor characteristic test method |
| CN109188092A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | Soil dynamic resistance characteristic test method under a kind of different temperatures |
| CN109188089A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The test method of different pH values lower leaf soil non-linear resistance characteristic |
| CN109188088A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method |
| CN109188093A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of electric resistance of soil under a kind of different pH values |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
| CN111521875A (en) * | 2020-03-19 | 2020-08-11 | 中国电力科学研究院有限公司 | Method and system for determining grounding impedance of shared tower |
| CN111783746A (en) * | 2020-08-07 | 2020-10-16 | 国网山东省电力公司鄄城县供电公司 | Protection method and device for power transmission line tower pole and electronic equipment |
| CN115115221A (en) * | 2022-06-25 | 2022-09-27 | 国网安徽省电力有限公司经济技术研究院 | Narrow-base steel tower construction analysis method based on cloud computing |
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| CN108872709A (en) * | 2018-08-13 | 2018-11-23 | 西南交通大学 | A kind of different moisture content lower leaf soil dynamic electric resistor characteristic test method |
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| CN109188089A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The test method of different pH values lower leaf soil non-linear resistance characteristic |
| CN109188088A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method |
| CN109188093A (en) * | 2018-08-13 | 2019-01-11 | 西南交通大学 | The nonlinear test method of electric resistance of soil under a kind of different pH values |
| CN109188088B (en) * | 2018-08-13 | 2019-11-05 | 西南交通大学 | A kind of vertical demixing electric resistance of soil nonlinear characteristic test method |
| CN110068735A (en) * | 2019-01-24 | 2019-07-30 | 贵州电网有限责任公司 | A method of measurement and reckoning grounding body and soil contact resistance |
| CN111521875A (en) * | 2020-03-19 | 2020-08-11 | 中国电力科学研究院有限公司 | Method and system for determining grounding impedance of shared tower |
| CN111783746A (en) * | 2020-08-07 | 2020-10-16 | 国网山东省电力公司鄄城县供电公司 | Protection method and device for power transmission line tower pole and electronic equipment |
| CN115115221A (en) * | 2022-06-25 | 2022-09-27 | 国网安徽省电力有限公司经济技术研究院 | Narrow-base steel tower construction analysis method based on cloud computing |
| CN115115221B (en) * | 2022-06-25 | 2023-08-08 | 国网安徽省电力有限公司经济技术研究院 | Narrow-base steel tower construction analysis method based on cloud computing |
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