CN103901328A - Method suitable for calculating transmission line pole tower grounding body lightning impulse characteristics - Google Patents

Method suitable for calculating transmission line pole tower grounding body lightning impulse characteristics Download PDF

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CN103901328A
CN103901328A CN201410117010.3A CN201410117010A CN103901328A CN 103901328 A CN103901328 A CN 103901328A CN 201410117010 A CN201410117010 A CN 201410117010A CN 103901328 A CN103901328 A CN 103901328A
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grounding body
rho
spark discharge
calculation
ground
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路永玲
陶风波
刘洋
周志成
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Abstract

本发明公开了一种适用于输电线路杆塔接地体雷电冲击特性的计算方法,该方法以电路理论为基础,明确了接地体在雷电流冲击作用下各个基本参数的计算公式,并在现有公式基础上,结合土壤火花放电理论,将非线性火花放电采用电路参数动态变化的计算模型体现出来,本发明中提出计算思路和方法,可以得出每一小段接地导体在火花放电过程中,该段电流和该段对地电阻(电导)之间的非线性关系,从而实现接地电阻随支路电流的瞬时变化,将电感效应,火花效应及雷电流的时变特征同时考虑进去;同时该计算过程简单直观,工作量小,参数可以灵活改变,为正确研究杆塔接地体冲击特性提供了快捷手段。

The invention discloses a calculation method suitable for the lightning impact characteristics of the grounding body of a transmission line pole tower. The method is based on circuit theory, and clarifies the calculation formulas of each basic parameter of the grounding body under the impact of lightning current, and uses the existing formula On the basis, combined with the theory of soil spark discharge, the nonlinear spark discharge adopts the calculation model of the dynamic change of circuit parameters, and the calculation idea and method are proposed in the present invention. The non-linear relationship between the current and the ground resistance (conductance) of this section, so as to realize the instantaneous change of the ground resistance with the branch current, taking into account the inductance effect, spark effect and time-varying characteristics of lightning current; at the same time, the calculation process It is simple and intuitive, with a small workload, and the parameters can be changed flexibly, which provides a shortcut for correctly studying the impact characteristics of the grounding body of the tower.

Description

A kind of computing method that are applicable to electric power line pole tower grounding body Lightning Characteristic
Technical field
The present invention relates to a kind of computing method that are applicable to electric power line pole tower grounding body Lightning Characteristic, belong to power technology field.
Background technology
Due to high-frequency and the high steepness of lightning current, make inductance important role in impact characteristics of grounding body, stop electric current to flow to a grounding body distant place, make impulse grounding coefficient be greater than 1, i.e. the inductive effect of lightning current; The amplitude of lightning current is very high, and then increase the electric field intensity in soil, in the time that being greater than the tolerance of soil, this electric field intensity just can there is non-linear puncturing, be equivalent to increase the effective dimensions of grounding body, now impulse earthed resistance is less than power frequency earthing resistance, and this feature is called the spark effect of lightning current; When lightning current injects when grounding body, just each branch's bamboo telegraph along grounding body with the form of ripple, in communication process the voltage and current ripple of each point can be with the difference in travel-time difference, i.e. the time-varying characteristics of lightning current.The calculating of grounding body Lightning Characteristic is not considered to inductive effect and spark effect both at home and abroad simultaneously, consider that inductive effect and spark effect can reflect the time-varying characteristics of grounding body impulse earthed resistance simultaneously.
At present mainly contain four about the theoretical system of Lightning Characteristic: Finite Element Method, transmission line theory, Theory of Electromagnetic Field and Circuit theory.Utilize finite element method matheematical equation, can solve engineering problem, but in impact characteristics numerical evaluation, finite element method thinks that the spark discharge of grounding body surrounding soil is uniformly approx, but in fact the power of spark effect is to change with the instantaneous size of dash current.The model of setting up according to transmission line theory and Theory of Electromagnetic Field can be considered the transient state process of impact characteristics, but two kinds of theories are not all considered the spark effect that grounding body presents under dash current; And Circuit theory can be calculated by setting up the model on road the transient characterisitics of grounding body, but need correct theoretical formula to derive, and non-linear spark discharge will be taken into account.
Summary of the invention
The deficiency existing for prior art, the object of the invention is to provide a kind of computing method that are applicable to electric power line pole tower grounding body Lightning Characteristic of simultaneously considering inductive effect and non-linear spark effect, computation process simple, intuitive, workload is little, parameter can change flexibly, for correct research tower grounding body impact characteristics provides quick means.
To achieve these goals, the present invention realizes by the following technical solutions:
Method of the present invention specifically comprises following step:
(1) the spark discharge region under dash current effect by grounding body, is subdivided into the cylindrical of some sections of different sizes; According to the non-homogeneous transmission line theory that damages, set up grounding body basic circuit model, wherein, R 0i, L i, C iand G ibe respectively every section of grounding body self-resistance, inductance, ground capacitance and over the ground electricity lead;
The calculating that electricity is led over the ground of unit length grounding body
G 0 = 2 π ρ ( ln l 2 2 hr - 0.61 )
Wherein, h is the buried degree of depth of grounding body; ρ is grounding body soil resistivity around; R is grounding body radius, can be by the equivalent radius r including bloom in the time that flashing discharges ireplace; L is grounding body length;
(2) calculate each section of columniform grounding body soil be critical around the current density, J while puncturing cfor:
J c = E c ρ = i i 2 π al i
Wherein:
E c=241r 0. 215
J ccurrent density while puncturing for soil is critical, E cfor soil critical breakdown strength, i ibe the diffusing size of i section, l ibe i segment length, a is grounding body original radius;
(3) critical current of calculating i section grounding body generation spark discharge is:
i c = 482000 π al i ρ 0.785
Work as i i<i ctime, not flashing electric discharge; Otherwise, flashing electric discharge;
(4) in the time that flashing discharges, its region of discharge is equivalent to good conductor, the equivalent redius of i section spark discharge is:
r i = &rho;i i 2 &pi; l i E c
In formula, i ichange along with the variation of time, thus equivalent redius also change along with the variation of time, each section of impulse earthed resistance nature temporal evolution;
(5) while calculating spark discharge, the resistance to earth of each section of grounding body is:
R i = 1 G i = 1 l i G 0 = &rho; ( In l 2 2 hr i ) - 0.61 2 &pi; l i = &rho; 2 &pi; l i [ ( In l 2 &pi; l i E c &rho; hi i ) - 0.61 ] = &rho; 2 &pi; l i [ ( In 241 &pi; l 2 l i &rho; 0.785 hi i ) - 0.61 ] = &rho; 2 &pi; l i [ In 241 &pi; l 2 l i &rho; 0.785 h - Ini i - 0.61 ]
= &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) - &rho; 2 &pi; l i In i i
If order &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) , b = &rho; 2 &pi; l i , :
R i=1/G i=a-bIn(i i)
Electricity is led and is over the ground:
G i = 1 a - bIn ( i i )
Wherein a, b is the undetermined coefficient that is greater than 0;
Thereby, determine that each section of grounding body is in spark discharge process, electric current and resistance to earth/nonlinear relationship between electric leading over the ground, utilizes this relation can realize the calculating of Lightning Characteristic.
In step (1), grounding body Parameter Calculation formula is as follows:
(1a) calculating of every section of grounding body self-resistance
R 0 = 1 2 &pi;r &omega;&mu; 2 &sigma;
R oi=R o*l i
In formula, R ofor unit length grounding body self-resistance, σ is the conductivity of grounding body own, the magnetic permeability that μ is grounding body, and ω is dash current equivalence angular frequency;
(2a) calculating of every section of grounding body inductance
L 0 = &mu; 0 2 &pi; ( ln 2 l r - 1 )
L i=L o*l i
In formula, L ofor unit length grounding body inductance, μ 0for permeability of vacuum;
(3a) calculating of every section of grounding body ground capacitance
C 0=e 0e rrG 0
C i=C o*l i
In formula, C ofor unit length grounding body ground capacitance, ε 0for permittivity of vacuum, ε rfor soil relative dielectric constant, ε 0ε rbe the specific inductive capacity that is filled in grounding body surrounding soil.
The present invention can truly reflect lightning current impact process on grounding body, comprises the time-varying characteristics of inductive effect, spark effect and impact characteristics; Meanwhile, this computation process simple, intuitive, workload is little, and parameter can change flexibly, for correct research tower grounding body impact characteristics provides quick means.
Brief description of the drawings
Fig. 1 is the spark discharge district schematic diagram of single horizontal grounding objects;
Fig. 2 is the isoboles in spark region;
Fig. 3 is the grounding body circuit model of considering transient process;
Fig. 4 is the circuit model of considering inductive effect and non-linear spark discharge.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
1, set up the equivalent-circuit model of non-linear spark discharge
Under lightning current impacts, the electric field intensity producing in soil can be calculated as follows:
E=ρJ (1)
Wherein ρ is the resistivity of soil of contacting with grounding body, and J is the diffusing density in soil.In the time that the field intensity of lightning current generation exceedes the withstand voltage of soil, grounding body soil around can puncture, and produces strong spark discharge, has been equivalent to increase the radius of grounding body, and diffusing effect is strengthened; The equivalent radius of transient state process of grounding body is taken as the equivalent radius at place place of spark discharge district.
The initial electric discharge field intensity of soil E calong with the increase of soil resistivity increases, its data are well below the breakdown field strength of air.Adopt the initial breakdown field strength of soil of E.E.Oettle proposition and the relation of resistivity:
E c=241r 0. 215 (2)
In formula, the unit of Ec is kV/m, and the unit of ρ is Ω m.
The big or small time to time change of dash current causes the severe degree of spark discharge also to change along with the time, and the frequency of lightning current is very high in addition, and therefore conductor induction reactance is very large, hinders electric current wandering to other one end along grounding body.Earial drainage just because of each position along grounding body is inhomogeneous, and the equivalent radius of spark discharge in transient state process is just different, has maximum equivalent radius at grounding body electric current decanting point, along with larger from decanting point distance, equivalent radius is less, and whole breakdown area presents taper, as shown in Figure 1.In order to facilitate the calculating of circuit parameter, cremate district is subdivided into regular small cylindrical, as Fig. 2.In order to improve simulation nicety, segmentation hop count is abundant, and in figure, a is grounding body original radius, r iit is the equivalent redius of i section.
Have for every a bit of cylindrical grounding body:
J c = E c &rho; = i i 2 &pi; al i - - - ( 3 )
Wherein J ccurrent density while puncturing for soil is critical, E cfor soil critical breakdown strength, i ibe the diffusing size of i section, l irefer to i segment length.Convolution (6) and (7) are tried to achieve i section grounding body and are produced the critical electric current value of spark discharge and be again:
i c = 482000 &pi; al i &rho; 0.785
(4)
Work as i i<i ctime, not flashing electric discharge; Otherwise, flashing electric discharge, and the equivalent redius of i section spark discharge is:
r i = &rho;i i 2 &pi; l i E c
Because i ichange along with the variation of time, thus equivalent redius also change along with the variation of time, impulse earthed resistance nature temporal evolution.
Unit length over the ground electricity is led formula and is:
G 0 = 2 &pi; &rho; ( ln l 2 2 hr - 0.61 )
(6)
The resistance to earth that simultaneous formula (2), (3), (5) and (6) can obtain i article of branch road with the variation pass of branch current is:
R i = 1 G i = 1 l i G 0 = &rho; ( In l 2 2 hr i ) - 0.61 2 &pi; l i = &rho; 2 &pi; l i [ ( In l 2 &pi; l i E c &rho; hi i ) - 0.61 ] = &rho; 2 &pi; l i [ ( In 241 &pi; l 2 l i &rho; 0.785 hi i ) - 0.61 ] = &rho; 2 &pi; l i [ In 241 &pi; l 2 l i &rho; 0.785 h - Ini i - 0.61 ] = &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) - &rho; 2 &pi; l i I ni i
If order &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) , b = &rho; 2 &pi; l i , :
R i=1/G i=a-bIn(i i) (7)
Electricity is led and is over the ground:
G i = 1 a - bIn ( i i )
Wherein a, b is the undetermined coefficient that is greater than 0; Determine that thus every a bit of earth conductor is in spark discharge process, the nonlinear relationship between this section of electric current and this section of resistance to earth (electricity is led).
In order to realize above nonlinear relationship, just need to calculate in each moment the new equivalent radius of each section of grounding body according to the current value of tried to achieve each node, can make the resistance to earth of this section by program means was a fixed value for this reason before critical current; And reaching critical current back-pushed-type (7) variation, thus be grounded the transient change of electrical resistance branch current, by inductive effect, the time varying characteristic of spark effect and lightning current is taken into account simultaneously.
For example in ATPDraw, introduce MODELS module, as Fig. 4.G in figure iwith i ivariation and the moment change, as long as collect i isize, just can change the size of every section of grounding body resistance to earth, wherein MODELS embeds following program:
MODEL ModelDef
INPUT i1
OUTPUT o1
VAR o1
INIT
o1:=0
ENDINIT
EXEC
if i1>ic then
o1:=a-b*ln(i1)
else o1:=R(0)
endif
ENDEXEC
ENDMODEL
2, set up complete impact characteristics circuit model
As shown in Figure 3, under the effect of dash current, grounding body can be regarded the non-homogeneous transmission line that damages as, and grounding body is divided into a lot of segments, and each section of grounding body can be regarded as by R 0i, L i, C iand G ithe equivalent circuit of composition; If spark effect is taken into account, obtain complete impact characteristics computation model, see Fig. 4.The Parameter Calculation formula of constituent parts length is as follows:
1) calculating of unit length grounding body self-resistance
The size of unit length grounding body resistance depends primarily on size and the conductor resistance rate of itself, with whether have spark effect irrelevant, but because lightning current equivalent frequency is very high, in the time flowing through grounding body, there is obvious skin effect on its surface, now the resistance of grounding body can become greatly, considers that the unit conductor resistance computing formula of lightning current high frequency characteristics has:
R 0 = 1 2 &pi;r &omega;&mu;&rho; 2
In formula, r is grounding body radius; R is the resistivity of metallic conductor own; M is the magnetic permeability of conductor; W is dash current equivalence angular frequency.To general iron and steel grounding body, test real side result between 0.04-0.05 Ω/m.
2) calculating of unit length grounding body inductance
Under lightning current percussive action, the inductance of magnetic linkage and current ratio is no longer a constant, but an amount with wave process dynamic change.In the process of propagating before wave direction, when the initial time that shock wave injects from conductor head end, conductor head end unit length dynamic inductance value is about stablizes 58% of inductance, and in the time that wave head arrives conductor ends, this value is close to 90%, and now dynamic inductance levels off to corresponding stable state inductance.The stable state inductance of unit length grounding body is calculated as follows:
L 0 = &mu; 0 2 &pi; ( ln 2 l r - 1 )
3) the unit length grounding body calculating that electricity is led over the ground
Unit length over the ground electricity is led formula and is:
G 0 = 2 &pi; &rho; ( ln l 2 2 hr - 0.61 )
Wherein h is the buried degree of depth of grounding body, and ρ is grounding body soil resistivity around; R is grounding body radius, under large electric current, in soil, non-linear puncturing occurs, and considers that the pressure drop in arc discharge area and spark region is very little, and the radius r in this formula must replace with the equivalent radius including bloom.The lightning current instantaneous value that is strongly subject to of spark discharge must affect, so equivalent radius temporal evolution, to lead be also time dependent nonlinear parameter to electricity over the ground.
4) calculating of unit length grounding body ground capacitance
Under power frequency steady-state current, the calculating formula of unit length grounding body ground capacitance is as follows:
C 0=e 0e rrG 0
In formula, ε 0for permittivity of vacuum; ε rfor soil relative dielectric constant; ε 0ε rbe and be filled in grounding body
The specific inductive capacity of surrounding soil, general value is 9 × 8.86 × 10 -12.
In general soil (m), grounding body size is limited for ρ=10~1000 Ω,
&omega; C 0 G 0 = 2 &pi;f&epsiv;&rho; = 2 &pi; 4 &times; 2.6 &times; 10 - 6 &times; 9 &times; 8.86 &times; 10 - 12 &times; ( 10 ~ 1000 ) &ap; 4.8 &times; 10 - 4 ~ 4.8 &times; 10 - 2
Can be found out G completely by result of calculation 0effect than C 0effect much bigger, now can be by C 0ignore over time.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (2)

1.一种适用于输电线路杆塔接地体雷电冲击特性的计算方法,其特征在于,具体包括以下几个步骤:1. A calculation method applicable to the lightning impulse characteristics of the transmission line pole tower grounding body is characterized in that it specifically comprises the following steps: (1)将接地体在冲击电流作用下的火花放电区域,细分为若干段不同大小的圆柱形;按照非均匀有损传输线理论,建立接地体基本电路模型,其中,R0i、Li、Ci和Gi分别为每段接地体自身电阻、电感、对地电容及对地电导;(1) Subdivide the spark discharge area of the grounding body under the action of the impact current into several cylindrical sections of different sizes; according to the theory of non-uniform lossy transmission lines, establish the basic circuit model of the grounding body, where R 0i , L i , C i and G i are the resistance, inductance, capacitance to ground and conductance to ground of each grounding body, respectively; 单位长度接地体对地电导的计算Calculation of unit length grounding body to ground conductance GG 00 == 22 &pi;&pi; &rho;&rho; (( lnln ll 22 22 hrhr -- 0.610.61 )) 其中,h为接地体埋地深度;ρ为接地体周围的土壤电阻率;r为接地体半径,当发生火花放电时可用包括火花区在内的等值半径ri代替;l为接地体长度;Among them, h is the buried depth of the grounding body; ρ is the resistivity of the soil around the grounding body; r is the radius of the grounding body, which can be replaced by the equivalent radius r i including the spark area when spark discharge occurs; l is the length of the grounding body ; (2)计算每一段圆柱形接地体在周围土壤中发生临界击穿时的电流密度Jc为:(2) Calculate the current density J c of each section of cylindrical grounding body when critical breakdown occurs in the surrounding soil as: JJ cc == EE. cc &rho;&rho; == ii ii 22 &pi;&pi; alal ii 其中:in: Ec=241r0.215 E c =241r 0 . 215 Jc为土壤临界击穿时的电流密度,Ec为土壤临界击穿场强,ii为第i段的散流大小,li为第i段长度,a为接地体原始半径;J c is the current density at the critical breakdown of the soil, E c is the critical breakdown field strength of the soil, i i is the size of the scattered flow of the i-th section, l i is the length of the i-th section, and a is the original radius of the grounding body; (3)计算第i段接地体产生火花放电的临界电流为:(3) Calculate the critical current of the spark discharge generated by the i-th section grounding body as: ii cc == 482000482000 &pi;&pi; alal ii &rho;&rho; 0.7850.785 即当ii<ic时,不发生火花放电;反之,发生火花放电;That is, when i i < ic , spark discharge does not occur; otherwise, spark discharge occurs; (4)当发生火花放电时,将其放电区域等效为良导体,则第i段火花放电的等效半径为:(4) When a spark discharge occurs, the discharge area is equivalent to a good conductor, then the equivalent radius of the i-th spark discharge is: rr ii == &rho;i&rho;i ii 22 &pi;&pi; ll ii EE. cc 式中,ii随着时间的变化而变化,所以等效半径也随着时间的变化而变化,每一段冲击接地电阻自然随时间变化;In the formula, i i changes with time, so the equivalent radius also changes with time, and the impact grounding resistance of each segment naturally changes with time; (5)计算火花放电时每一段接地体的对地电阻为:(5) When calculating the spark discharge, the resistance to ground of each grounding body is: RR ii == 11 GG ii == 11 ll ii GG 00 == &rho;&rho; (( InIn ll 22 22 hrhr ii )) -- 0.610.61 22 &pi;&pi; ll ii == &rho;&rho; 22 &pi;&pi; ll ii [[ (( InIn ll 22 &pi;&pi; ll ii EE. cc &rho;&rho; hihi ii )) -- 0.610.61 ]] == &rho;&rho; 22 &pi;&pi; ll ii [[ (( InIn 241241 &pi;&pi; ll 22 ll ii &rho;&rho; 0.7850.785 hihi ii )) -- 0.610.61 ]] == &rho;&rho; 22 &pi;&pi; ll ii [[ InIn 241241 &pi;&pi; ll 22 ll ii &rho;&rho; 0.7850.785 hh -- Iniini ii -- 0.610.61 ]] == &rho;&rho; 22 &pi;&pi; ll ii (( InIn 241241 &pi;&pi; ll 22 ll ii &rho;&rho; 0.7850.785 hh -- 0.610.61 )) -- &rho;&rho; 22 &pi;&pi; ll ii II nini ii 若令 &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) , b = &rho; 2 &pi; l i , 则:Ruoling &rho; 2 &pi; l i ( In 241 &pi; l 2 l i &rho; 0.785 h - 0.61 ) , b = &rho; 2 &pi; l i , but: Ri=1/Gi=a-bIn(ii)R i =1/G i =a-bIn(i i ) 对地电导即为:Conductance to ground is: GG ii == 11 aa -- bInbIn (( ii ii )) 其中a,b均为大于0的待定系数;Where a and b are undetermined coefficients greater than 0; 从而,确定了每一段接地体在火花放电过程中,电流与对地电阻/对地电导之间的非线性关系,利用此关系可实现雷电冲击特性的计算。Therefore, the nonlinear relationship between the current and the ground resistance/conductance of each grounding body during the spark discharge process is determined, and the calculation of the lightning impulse characteristics can be realized by using this relationship. 2.根据权利要求1所述的适用于输电线路杆塔接地体雷电冲击特性的计算方法,其特征在于,2. according to claim 1, be applicable to the calculation method of the lightning impulse characteristic of transmission line tower grounding body, it is characterized in that, 步骤(1)中,接地体基本参数计算公式如下:In step (1), the calculation formula of the basic parameters of the grounding body is as follows: (1a)每段接地体自身电阻的计算(1a) Calculation of the resistance of each grounding body RR 00 == 11 22 &pi;r&pi;r &omega;&mu;&omega;&mu; 22 &sigma;&sigma; Roi=Ro*li R oi =R o *l i 式中,Ro为单位长度接地体自身电阻,σ为接地体本身电导率,μ为接地体的磁导率,ω为冲击电流等效角频率;In the formula, R o is the resistance of the grounding body itself per unit length, σ is the electrical conductivity of the grounding body itself, μ is the magnetic permeability of the grounding body, and ω is the equivalent angular frequency of the impulse current; (2a)每段接地体电感的计算(2a) Calculation of the inductance of each grounding body LL 00 == &mu;&mu; 00 22 &pi;&pi; (( lnln 22 ll rr -- 11 )) Li=Lo*li L i =L o *l i 式中,Lo为单位长度接地体电感,μ0为真空磁导率;In the formula, L o is the grounding body inductance per unit length, μ 0 is the vacuum permeability; (3a)每段接地体对地电容的计算(3a) Calculation of the ground capacitance of each ground body C0=e0errG0 C 0 =e 0 e r rG 0 Ci=Co*li C i =C o *l i 式中,Co为单位长度接地体对地电容,ε0为真空介电常数,εr为土壤相对介电常数,ε0εr即为填充在接地体周围土壤的介电常数。In the formula, C o is the capacitance of the grounding body to the ground per unit length, ε 0 is the vacuum dielectric constant, ε r is the relative dielectric constant of the soil, and ε 0 ε r is the dielectric constant of the soil filled around the grounding body.
CN201410117010.3A 2014-03-26 2014-03-26 Method suitable for calculating transmission line pole tower grounding body lightning impulse characteristics Pending CN103901328A (en)

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CN105445559A (en) * 2015-11-19 2016-03-30 三峡大学 Method of quantitatively describing influence of spark effect intensity changes on impulse grounding resistor
CN105486929A (en) * 2014-09-19 2016-04-13 国家电网公司 Impulse grounding resistance calculation method considering spark discharge effect
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CN107576870A (en) * 2017-09-06 2018-01-12 广东电网有限责任公司佛山供电局 The secondary thunderbolt safety evaluation method of pond fish body based on vertical grounding electrode protection
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CN109783849A (en) * 2018-12-06 2019-05-21 西安交通大学 Single fast rising thunder and lightning flow component acts on lower carbon fibre composite damage measurement method
CN112821095A (en) * 2021-01-06 2021-05-18 广东电网有限责任公司惠州供电局 Method for reducing impact grounding impedance and non-equal-diameter grounding device

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CN105486929A (en) * 2014-09-19 2016-04-13 国家电网公司 Impulse grounding resistance calculation method considering spark discharge effect
CN105652160A (en) * 2014-11-14 2016-06-08 武陟县电业总公司 Method for calculating lightning stroke impact characteristics of electric power equipment lightning protection grounding body
CN104714067A (en) * 2015-03-16 2015-06-17 国家电网公司 Portable lightning current generating device and method for grounding device impact impedance testing
CN104714067B (en) * 2015-03-16 2017-10-03 国家电网公司 The portable thunder and lightning stream generation apparatus and method tested for earthing or grounding means impact impedance
CN105445559A (en) * 2015-11-19 2016-03-30 三峡大学 Method of quantitatively describing influence of spark effect intensity changes on impulse grounding resistor
CN107576870A (en) * 2017-09-06 2018-01-12 广东电网有限责任公司佛山供电局 The secondary thunderbolt safety evaluation method of pond fish body based on vertical grounding electrode protection
CN109783849A (en) * 2018-12-06 2019-05-21 西安交通大学 Single fast rising thunder and lightning flow component acts on lower carbon fibre composite damage measurement method
CN109613340A (en) * 2019-01-24 2019-04-12 贵州电网有限责任公司 A kind of impulse earthed resistance calculation method with spark thorn
CN112821095A (en) * 2021-01-06 2021-05-18 广东电网有限责任公司惠州供电局 Method for reducing impact grounding impedance and non-equal-diameter grounding device
CN112821095B (en) * 2021-01-06 2023-02-03 广东电网有限责任公司惠州供电局 A method of reducing impact grounding impedance and non-equal diameter grounding device

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