CN108020725B - A kind of earth mat impulse earthed resistance measurement method under the influence of different soils pH value - Google Patents
A kind of earth mat impulse earthed resistance measurement method under the influence of different soils pH value Download PDFInfo
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- CN108020725B CN108020725B CN201711250002.6A CN201711250002A CN108020725B CN 108020725 B CN108020725 B CN 108020725B CN 201711250002 A CN201711250002 A CN 201711250002A CN 108020725 B CN108020725 B CN 108020725B
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- 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 measurement method under the influence of a kind of different soils pH value, 1) each step of this method, which is respectively as follows:, investigates tested tower grounding net situation, 2) soil acidity or alkalinity test macro near shaft tower earth mat is built according to field working conditions, 3) reconnaissance detects tested grounded screen surrounding soil pH value distribution situation, 4) data of each measurement point are calculated to whole impulse earthed resistance weighing factor, 5) according to test point pH value data, shaft tower earth mat is calculated in the impulse earthed resistance for considering the distribution of earth mat pH value.The present invention is according to actual condition, the case where earth mat impulse earthed resistance under different pH values effectively can accurately be calculated, can effectively judge shaft tower route operating status when by being struck by lightning by the calculating to impulse earthed resistance；Test platform is easy to arrange, simple and effective, is suitable for different operating conditions.
Description
Technical field
The present invention relates to electric system lightning protection and ground connection field, influence more particularly, to a kind of different soils pH value
Under earth mat impulse earthed resistance measurement method.
Background technique
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 be increased, lightning stroke
When tower top current potential determined by the impulse earthed resistance of electric power line pole tower earthing or grounding means, to will affect line insulator string institute
The overvoltage and counterattack probability of flashover received.It is biggish temporarily that the impulse earthed resistance of power plant and grounding net of transformer substation crosses senior general's generation
State ground potential liter, will also threaten the safety of equipment and personnel when serious.Therefore, in order to guarantee power system security reliability service with
And the safety of relevant device, personnel, it is desirable to which electric system has 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.
Existing research shows that the variation of grounded screen surrounding soil pH value generates directly impulse grounding resistance of electric power system
It influences.If the impulse earthed resistance value of earthing or grounding means when energy accurate evaluation soil acidity or alkalinity variation, can be in different soils acid
It is effectively improved ground connection impact characteristics under basicity environment, reduces the generation of counterattack accident, guarantees the safe and stable operation of electric system.
The present invention is tightly bonded intelligent monitoring direction, develops a set of to the detection of existing shaft tower surrounding soil pH value and calculating pH value point
The system and corresponding calculation method that cloth influences impulse earthed resistance promote intelligence to can also power grid be promoted efficiently to construct
The fast construction of power grid.Apparatus of the present invention can real-time measurement grounded screen surrounding soil pH value distribution, and by a large amount of real
It tests, emulate and corresponding theory deduction obtains the calculation method and calculation formula of impulse earthed resistance, can real-time and accurately assess
Impulse earthed resistance value provides necessary data to be effectively improved the impact characteristics of earthing or grounding means.
Summary of the invention
The present invention provides a kind of accurate earth mat impulse earthed resistance measurement side under the influence of different soils pH value in real time
Method.
In order to reach above-mentioned technical effect, technical scheme is as follows:
A kind of earth mat impulse earthed resistance measurement method under the influence of different soils pH value, comprising the following steps:
S1: live pilot investigation；
S2: it chooses measurement point and assembles 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, the rectangular area that four side of grounded screen surrounds is S2, grounded screen buried depth is H, and grounded screen longest edge lengths are L1And thunder and lightning punching
Hitting electric current is Im。
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, and 2,3,4 points；It connects
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 collected data are passed by signal transmssion line
Enter PH acquisition module, 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 passes through coaxial cable again and is connected to terminal upper computer.
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 obtains 1, and 2,3,4 points account for overall electrical resistance weight respectively are as follows:
5,6 points of shared weights jointly are as follows:
7,8 points of shared weights jointly are as follows:
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635；
Weight shared by 9 points are as follows:
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 of lightning current is calculated are as follows:
Grounded screen Area modificatory coefficient are as follows:
Soil resistivity correction factor are as follows:
Further, the process of the step S5 is:
It enables
Impulse earthed resistance are as follows:
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 measurement method under the influence of a kind of different soils pH value, and this method is each
1) step, which is respectively as follows:, investigates tested tower grounding net situation, 2) soil acidity or alkalinity near shaft tower earth mat is built according to field working conditions
Test macro, 3) the tested grounded screen surrounding soil pH value distribution situation of reconnaissance detection, 4) number of each measurement point is calculated
According to whole impulse earthed resistance weighing factor, 5) according to test point pH value data, shaft tower earth mat is calculated and is considering ground
The impulse earthed resistance of net pH value distribution.Different pH values effectively can be accurately calculated according to actual condition in the present invention
The case where lower earth mat impulse earthed resistance, can effectively judge shaft tower when by being struck by lightning by the calculating to impulse earthed resistance
Route operating status；Test platform is easy to arrange, simple and effective, is suitable for different operating conditions.
Detailed description of the invention
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；
Fig. 3 is the method for the present invention system mounted.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain 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 understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The following further describes the technical solution of the present invention with reference to the accompanying drawings and examples.
Embodiment 1
As shown in Figure 1, the earth mat impulse earthed resistance measurement method under the influence of a kind of different soils pH value, including it is following
Step:
Step 1: live pilot investigation
Selecting shaft tower, nearby soil resistivity ρ is 200 Ω m, and grounded screen longest edge lengths L1 is 20m, grounded screen section
Product S1 is 25* π mm2, the rectangular area S2 that four side of grounded screen surrounds is 100m2Region as test zone.
Step 2: choosing measurement point and assembling combined experimental device
Nine points are chosen in grounded screen as measurement point, wherein the four of grounded screen apex angle is respectively 1, and 2,3,4 points；It connects
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 collected data are passed by signal transmssion line
Enter PH acquisition module 10, which carries out Macro or mass analysis to data, can obtain the real-time pH value of nine test points, 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 passes through coaxial cable 14 again and connects
To terminal upper computer 12.
Step 3: 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 jointly are as follows:
5,6 points of shared weights jointly are as follows:
7,8 points of shared weights jointly are as follows:
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635；
Weight shared by 9 points are as follows:
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、w4W is calculated in calculation formula1=0.008475, w2=0.1704, w3=0.19955,
w4=0.2336.
Step 4: signal processor carries out parameters revision
The correction factor of lightning current are as follows:
Grounded screen Area modificatory coefficient are as follows:
Soil resistivity correction factor are as follows:
Step 5: impulse earthed resistance is calculated
According to the data for obtaining needs 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 the weight w in four regions1=
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；
Described in attached drawing positional relationship for only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, 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
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (3)
1. the earth mat impulse earthed resistance measurement method under the influence of a kind of different soils pH value, which is characterized in that including following
Step:
S1: live pilot investigation；
S2: it chooses measurement point and assembles 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；
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
The rectangular area that four side of net surrounds is S2, grounded screen buried depth is H, and grounded screen longest edge lengths are L1And lightning impulse current is
Im；
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, and 2,3,4 points；Grounded screen
Upper following midpoint is respectively 5, and 6 points；Grounded screen left and right side midpoint is respectively 7, and 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 collected data 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,
By coaxial cable by each pH value input signal analysis processor, signal processor passes through 1 ..., 9, PH acquisition modules again
Coaxial cable is connected to terminal upper computer；
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 range identical；Measurement point 7,8 is considered as identical in allowable range of error；9 points, separately as a measurement point, obtain
1,2,3,4 point accounts for overall electrical resistance weight respectively are as follows:
5,6 points of shared weights jointly are as follows:
7,8 points of shared weights jointly are as follows:
w3=-0.00022125*S2^1.2+0.0015655*S2^0.9+0.15635
Weight shared by 9 points are as follows:
w4=-1.665*S2 0.1751+log(S2 0.4477+S2 0.8+4.931)。
2. the earth mat impulse earthed resistance measurement method under the influence of different soils pH value according to claim 1, special
Sign is that the process of the step S4 is:
The correction factor of lightning current is calculated are as follows:
Grounded screen Area modificatory coefficient are as follows:
Soil resistivity correction factor are as follows:
3. the earth mat impulse earthed resistance measurement method under the influence of different soils pH value according to claim 2, special
Sign is that the process of the step S5 is:
It enables
Impulse earthed resistance are as follows:
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