CN102495327B - Detection method and device for design of grounding grid of substation - Google Patents

Abstract

The invention provides a detection method for the design of a grounding grid of a substation, which includes the steps: building a boundary element model of the grounding grid; obtaining impedance characteristics of a grounding grid conductor; computing the grounding resistance of the grounding grid according to the impedance characteristics of the grounding grid conductor and the built boundary element model; obtaining total fault current and current divider coefficient of the grounding grid; determining the quantity of potential rise caused by the grounding grid according to the total fault current, the current divider coefficient and the grounding resistance of the grounding grid; and adjusting equipment parameters corresponding to the grounding grid according to the quantity of potential rise caused by the grounding grid. The invention further provides a detection device for the design of the grounding grid of the substation, which can be used for increasing the accurate rate of the grounding resistance of the grounding grid of the substation, increasing the accurate rate of the quantity of potential rise caused by the grounding grid and ensuring safety of staff and normal power transmission.

Description

A kind of design of grounding grid of substation detection method and device

Technical field

The present invention relates to the transformer station of electric system, be specifically related to a kind of detection method and device of design of grounding grid of substation.

Background technology

Grounded screen substation safety in service play a part very important, not only provide a public reference ground for the interior various electrical equipment of standing, drain fault current in the time of can also breaking down in system and reduce the earth potential liter of transformer station, thereby guarantee to stand interior staff's personal safety and the normal operation of various electrical equipments.

An important goal of ground grid design is that the maximum potential of control grounded screen raises.Wherein, the potential rise that causes of grounded screen: V=RI; R represents stake resistance, and I represents into the earth fault electric current, and I=Ie * (1-Ke), Ie is the total failare electric current, and Ke is diverting coefficient.Domestic employing steel grounded screen, resistivity and the magnetic permeability of steel are higher, and grounded screen not equipotential problem is comparatively serious.The passing ground grid design computational tool that corresponding geology and geomorphology situation is not arranged, under the power frequency fault current, the grounding grid design of transformer station is directly applied mechanically passing equipotential model, and the stake resistance error that calculates is larger; When electric system generation earth fault, enter the current potential that produces in earthed system of alternating current on ground, the component with the electric current homophase is not only arranged, also have the component with the earth current quadrature, i.e. perceptual part in the ground connection parameter.In the electrical grounding design, ignored perceptual weight, it is on the low side more that the grounded screen maximum potential of calculating is raise, and threatens staff's life safety, electrical equipment work undesired, and impact is transmission of electricity normally.

Summary of the invention

The objective of the invention is to propose a kind of detection method of design of grounding grid of substation, can improve the accuracy of the stake resistance of grounding net of transformer substation, the accuracy of the potential rise a large amount that raising grounded screen causes guarantees staff's safety and normal transmission of electricity.

Based on above-mentioned purpose, the scheme of employing:

A kind of detection method of design of grounding grid of substation comprises step:

Set up the boundary element model of grounded screen;

Obtain the impedance operator of grounded screen conductor;

According to the impedance operator of described grounded screen conductor and the boundary element model of foundation, calculate the stake resistance of grounded screen;

Obtain total failare electric current and the diverting coefficient of grounded screen;

According to the total failare electric current of described grounded screen, described diverting coefficient and described stake resistance, determine the potential rise a large amount that grounded screen causes;

Device parameter corresponding to potential rise a large amount regulated ground net that causes according to described grounded screen.

The present invention sets up first the boundary element model of grounded screen, then obtains the impedance operator of grounded screen conductor, utilizes its impedance operator and boundary element model to carry out simultaneous solution, is grounded the not correct calculating of the Resistance of Grounding Grids in the equipotential situation of net; Obtain again total failare electric current and the diverting coefficient of grounded screen, obtain the potential rise a large amount that the higher grounded screen of accuracy rate causes in conjunction with the stake resistance calculating that calculates, according to device parameter corresponding to this potential rise a large amount regulated ground net, safeguard work personnel's life safety ensures normally transmission of electricity.

The present invention also aims to propose a kind of pick-up unit of design of grounding grid of substation, can improve the accuracy of the stake resistance of grounding net of transformer substation, the accuracy of the potential rise a large amount that raising grounded screen causes guarantees staff's safety and normal transmission of electricity.

Based on above-mentioned purpose, the scheme of employing:

A kind of pick-up unit of design of grounding grid of substation comprises:

Model is set up the unit, is used for setting up the boundary element model of grounded screen;

The first acquiring unit is for the impedance operator of obtaining the grounded screen conductor;

The first computing unit is used for according to the impedance operator of described grounded screen conductor and the boundary element model of foundation, calculates the stake resistance of grounded screen;

Second acquisition unit is for the total failare electric current and the diverting coefficient that obtain grounded screen;

The second computing unit is used for according to the total failare electric current of described grounded screen, described diverting coefficient and described stake resistance, determines the potential rise a large amount that grounded screen causes;

Regulon is used for device parameter corresponding to potential rise a large amount regulated ground net that causes according to described grounded screen.

Apparatus of the present invention are set up the boundary element model that grounded screen is set up in the unit by model, then obtain the impedance operator of grounded screen conductor by the first acquiring unit; The first computing unit utilizes its impedance operator and boundary element model to carry out simultaneous solution, is grounded the not correct calculating of the Resistance of Grounding Grids in the equipotential situation of net; Obtain again total failare electric current and the diverting coefficient of grounded screen by second acquisition unit; The second computing unit calculates in conjunction with the stake resistance that calculates and obtains the potential rise a large amount that the higher grounded screen of accuracy rate causes, regulon is according to device parameter corresponding to this potential rise a large amount regulated ground net, safeguard work personnel's life safety ensures normally transmission of electricity.

Description of drawings

Fig. 1 is a process flow diagram of the inventive method;

Fig. 2 is scale coefficient iteration subdivision method principle schematic;

Fig. 3 is a structural representation of apparatus of the present invention.

Embodiment

For ease of understanding the present invention, set forth below in conjunction with accompanying drawing.

Please refer to Fig. 1, the present invention proposes a kind of detection method of design of grounding grid of substation, comprises step:

101, set up the grounded screen boundary model;

102, obtain grounded screen Conductor Impedance characteristic;

103, calculate stake resistance according to boundary model and impedance operator;

According to the impedance operator of grounded screen conductor and the boundary element model of foundation, calculate the stake resistance of grounded screen.

Concrete: boundary element electric density η _iSatisfy following condition:

${\mathrm{\η}}_i=-\frac{1}{2\mathrm{\π}}\frac{{\mathrm{\ρ}}_{\mathrm{bi}}-{\mathrm{\ρ}}_{\mathrm{fi}}}{{\mathrm{\ρ}}_{\mathrm{bi}}+{\mathrm{\ρ}}_{\mathrm{fi}}}[{\mathrm{\η}}_i{\∫}_{s_i}\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_i^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_i^{\′}|}^3}\·{\hat{n}}_i\mathrm{ds}$

$+\underset{j=1,j\≠i}{\overset{m}{\mathrm{\Σ}}}{\mathrm{\η}}_j{\∫}_{s_j}(\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j|}^3}+\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}|}^3})\·{\hat{n}}_i\mathrm{ds}+\underset{j=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ϵ}}_j{\∫}_{L_j}(\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j|}^3}+\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}|}^3})\·{\hat{n}}_i\mathrm{dL}]---\left(1\right)$

${\mathrm{\η}}_i=-{\mathrm{\α}}_i[{\mathrm{\η}}_i{\∫}_{s_i}\frac{{\stackrel{\→}{r}}_{\mathrm{ii}}^{\′}}{{\left|{\stackrel{\→}{r}}_{\mathrm{ii}}^{\′}\right|}^3}\·{\hat{n}}_i\mathrm{ds}+\underset{j=1,j\≠i}{\overset{m}{\mathrm{\Σ}}}{\mathrm{\η}}_j{\∫}_{s_j}(\frac{{\stackrel{\→}{r}}_{\mathrm{ij}}}{{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}^3}+\frac{{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}}{{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}\right|}^3})\·{\hat{n}}_i\mathrm{ds}+\underset{j=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ϵ}}_j{\∫}_{L_j}(\frac{{\stackrel{\→}{r}}_{\mathrm{ij}}}{{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}^3}+\frac{{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}}{{\left|r_{\mathrm{ij}}^{\′}\right|}^3})\·{\hat{n}}_i\mathrm{dL}]---\left(2\right)$

Wherein, ${\mathrm{\α}}_i=\frac{1}{2\mathrm{\π}}\frac{{\mathrm{\ρ}}_{\mathrm{bi}}-{\mathrm{\ρ}}_{\mathrm{fi}}}{{\mathrm{\ρ}}_{\mathrm{bi}}+{\mathrm{\ρ}}_{\mathrm{fi}}},$ ${\stackrel{\→}{r}}_{\mathrm{ij}}={\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j,$ ${\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}={\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_i^{\′},$ ${\mathrm{\ϵ}}_i=\frac{{\mathrm{\ϵ}}_0{\mathrm{\ρ}}_i{I}_i}{L_i},$ I _iBe the earth current of i section conductor, r is resistance, and ρ is resistivity, and L is conductor length, and s is conductor cross-sectional area, and η is boundary element electric density, and ε is specific inductive capacity, and n is the boundary element number;

Formula (2) is write as matrix form:

Aη′+BI＝0 (3)

Wherein, ${\mathrm{\η}}^{\′}=\frac{\mathrm{\η}}{{\mathrm{\ϵ}}_0},$ $A_{i,i}=1+{\mathrm{\α}}_i{\∫}_{s_i}\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_i^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_i^{\′}|}^3}\·{\hat{n}}_i\mathrm{ds},$ $A_{i,j}={\mathrm{\α}}_i{\∫}_{s_j}(\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j|}^3}+\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}|}^3})\·{\hat{n}}_i\mathrm{ds}(i\≠j),$ $B_{i,j}={\mathrm{\α}}_i\frac{{\mathrm{\ρ}}_i}{L_i}{\∫}_{L_j}(\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j|}^3}+\frac{{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}}{{|{\stackrel{\→}{r}}_i-{\stackrel{\→}{r}}_j^{\′}|}^3})\·{\hat{n}}_i\mathrm{dL}.$

Conductor current potential U _iSatisfy following condition:

$U_i=\frac{1}{4\mathrm{\π}{\mathrm{\ϵ}}_0}[\underset{j=1}{\overset{m}{\mathrm{\Σ}}}{\mathrm{\η}}_j{\∫}_{s_j}(\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}+\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}\right|})\mathrm{ds}+\underset{j=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\ϵ}}_j{\∫}_{L_j}(\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}+\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}\right|})\mathrm{dL}]---\left(4\right)$

Formula (4) is write as matrix form:

U＝Cη′+DI (5)

Wherein: $C_{i,j}=\frac{1}{4\mathrm{\π}}{\∫}_{s_j}(\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}+\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}\right|})\mathrm{ds},$ $D_{i,j}=\frac{1}{4\mathrm{\π}}\frac{{\mathrm{\ρ}}_i}{L_i}{\∫}_{L_j}(\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}\right|}+\frac{1}{\left|{\stackrel{\→}{r}}_{\mathrm{ij}}^{\′}\right|})\mathrm{dL}.$

Had by the ground connection theory:

U＝KV (6)

F＝K ^tI+A ^tGAV (7)

Solution has:

F＝[K ^t(D-CA ^-1B) ^-1K+A ^tGA]V (8)

Wherein, U represents conductor current potential matrix; V representation node current potential matrix; K represents incidence matrix; F representation node Injection Current column vector;

Can obtain grounding resistance by above-mentioned formula; Stake resistance calculating value equals maximum node voltage divided by the node Injection Current.

104, obtain total failare electric current and diverting coefficient;

Obtain total failare electric current and the diverting coefficient of grounded screen.

105, calculate the potential rise amount according to total failare electric current, diverting coefficient and stake resistance;

According to total failare electric current, diverting coefficient and the stake resistance of grounded screen, calculate the potential rise a large amount that grounded screen causes.

106, according to potential rise a large amount regulated ground net device parameter.

Device parameter corresponding to potential rise a large amount regulated ground net that causes according to grounded screen.

The present invention sets up first the boundary element model of grounded screen, then obtains the impedance operator of grounded screen conductor, utilizes its impedance operator and boundary element model to carry out simultaneous solution, is grounded the not correct calculating of the Resistance of Grounding Grids in the equipotential situation of net; Obtain again total failare electric current and the diverting coefficient of grounded screen, obtain the potential rise a large amount that the higher grounded screen of accuracy rate causes in conjunction with the stake resistance calculating that calculates, according to device parameter corresponding to this potential rise a large amount regulated ground net, safeguard work personnel's life safety ensures normally transmission of electricity.

Because the area of the covering of transmission line of electricity is with a varied topography, for example coastal knob; Its substation grounding number of conductor is numerous and the overlay area is large, and space distribution is irregular, adds that geological condition is very complicated, has caused the boundary element subdivision very difficult.Adopt at present usually the method for manual specified boundary subdivision form to carry out, namely manually input the subdivision number on each concrete border and subdivision ratio to satisfy near the enough dense requirements of border the conductor.This method shortcoming is fairly obvious: on the one hand, often carry out according to my experience by manual specified boundary subdivision form, usually need to repeatedly adjust the subdivision parameter and just can obtain correct result of calculation, thereby be theoretically unsound; Coastal knob transformer station border is numerous in addition, the manual methods inefficiency.Can do following improvement to above-described embodiment for this reason:

When setting up the boundary element model of grounded screen, utilize the spatial relationship on grounded screen conductor and border to be grounded the self-adaptation subdivision of conductor, set up the boundary element model of ultra-large ground connection entoilage according to the conductor behind the subdivision (boundary element).Its concrete steps are as follows:

Please refer to Fig. 2, have a quadrilateral original boundaries S and point source P, e ₁And e ₂For two yardsticks of S, get scale coefficient k, d is the vertical range of P and S, and makes following agreement:

1. if d 〉=ke ₁, d 〉=ke ₂Complete is no, and then S all segments 2 parts on two dimension, and this moment, S was divided into 4 parts;

2. if d 〉=ke ₁, d 〉=ke ₂It is no that one is arranged, and for no person segments 2 parts in dimension, this moment, S was divided into 2 parts;

3. if d 〉=ke ₁, d 〉=ke ₂Be very, then S need not further subdivision;

4. if S occurs through the situation of segmentation, the S after the segmentation replaces former S to make iteration, until d 〉=ke is satisfied on all borders ₁, d 〉=ke ₂

Adopt the ultra-large boundary element model of above-mentioned foundation, greatly promoted the boundary element number that uses during ground connection is calculated.Be limited to 7500 on the present most widely used external software cd EGS boundary element, and the upper limit of software for calculation of the present invention can reach 40000, thereby can consider the complex geological conditions situation, and find the solution irregular soil problem with grounding, be applicable to the substation grounding of coastal knob and calculate.

Because the number of boundary element is numerous, the speed of model solution is slow, and computation model is found the solution with the form of matrix algorithms.

For raising speed can be found the solution with parallel triangle (LU) decomposition method; Parallel LU factorization adopts parallel Du Liteer to decompose the product that the coefficient matrices A of full rank equation is decomposed into upper triangular matrix U and lower triangle battle array L, and deposit in original matrix A with compact form, mode with back substitution when solving an equation is carried out, has save memory, computing velocity is fast, the advantages such as better numerical value stability.

An important parameter when transformer station's diverting coefficient is the analysis grounding security of system, must considering.China is in design in the past, and diverting coefficient often adopts simplifies the method for calculating or estimating, has ignored like this impact of several factors, often causes larger error.For head it off, can do following improvement to obtaining of diverting coefficient:

When obtaining the diverting coefficient of grounded screen, determine first the structural parameters of circuit in the electrical network, the structural parameters of transformer, the ground connection parameter of grounding net of transformer substation;

According to the method for operation of electrical network, the structural parameters of circuit, transformer, grounding net of transformer substation are carried out the modeling of phase component;

According to the phase component model of the circuit of cyclic current method and foundation, transformer, grounding net of transformer substation, find the solution the fault current distribution of electrical network, thereby obtain diverting coefficient by definition.

The below introduces apparatus of the present invention, please be with reference to figure 3, and a kind of pick-up unit of design of grounding grid of substation:

Model is set up unit T1, is used for setting up the boundary element model of grounded screen;

The first acquiring unit T2 is for the impedance operator of obtaining the grounded screen conductor;

The first computing unit T3 is used for according to the impedance operator of grounded screen conductor and the boundary element model of foundation, calculates the stake resistance of grounded screen;

Second acquisition unit T4 is for the total failare electric current and the diverting coefficient that obtain grounded screen;

The second computing unit T5 is used for total failare electric current, diverting coefficient and stake resistance according to grounded screen, determines the potential rise a large amount that grounded screen causes;

Regulon T6 is used for device parameter corresponding to potential rise a large amount regulated ground net that causes according to grounded screen.

Apparatus of the present invention are set up the boundary element model that grounded screen is set up in the unit by model, then obtain the impedance operator of grounded screen conductor by the first acquiring unit; The first computing unit utilizes its impedance operator and boundary element model to carry out simultaneous solution, is grounded the not correct calculating of the Resistance of Grounding Grids in the equipotential situation of net; Obtain again total failare electric current and the diverting coefficient of grounded screen by second acquisition unit; The second computing unit calculates in conjunction with the stake resistance that calculates and obtains the potential rise a large amount that the higher grounded screen of accuracy rate causes, regulon is according to device parameter corresponding to this potential rise a large amount regulated ground net, safeguard work personnel's life safety ensures normally transmission of electricity.

Because the covering of transmission line of electricity is regional with a varied topography, for example coastal knob; Its substation grounding number of conductor is numerous and the overlay area is large, and space distribution is irregular, adds that geological condition is very complicated, has caused the boundary element subdivision very difficult.Usually adopt at present the method for manual specified boundary subdivision form to carry out, be theoretically unsound, the diverting coefficient that obtains is inaccurate, and the manual methods inefficiency.Can do following improvement to above-described embodiment for this reason:

Model is set up unit T1 when setting up the boundary element model of grounded screen, utilizes the spatial relationship on grounded screen conductor and border to be grounded the self-adaptation subdivision of conductor, sets up the boundary element model of ultra-large ground connection entoilage according to the boundary element behind the subdivision.

In order to improve arithmetic speed, the first computing unit T3 adopts matrix algorithms to calculate the stake resistance of grounded screen; Adopt parallel LU decomposition algorithm to calculate stake resistance.

An important parameter when transformer station's diverting coefficient is the analysis grounding security of system, must considering.China is in design in the past, and diverting coefficient often adopts simplifies the method for calculating or estimating, has ignored like this impact of several factors, often causes larger error.For head it off, can do following improvement to obtaining of diverting coefficient:

Second acquisition unit T4 sets up the structural parameters of the force device of grounded screen when obtaining the diverting coefficient of grounded screen;

According to the method for operation of electrical network, the structural parameters of circuit, transformer, grounding net of transformer substation are carried out the modeling of phase component; According to the phase component model of the circuit of cyclic current method and foundation, transformer, grounding net of transformer substation, find the solution the fault current distribution of electrical network, thereby obtain diverting coefficient by definition.

Utilize method of the present invention, can also detect the detection of other ground connection parameters in the ground grid design, such as: earth mat self Potential distribution, surface potential distribution, contact electricity, step voltage etc.

Above embodiment of the present invention does not consist of the restriction to protection domain of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection domain of the present invention.

Claims (8)

1. the detection method of a design of grounding grid of substation is characterized in that, comprises step:

Set up the boundary element model of grounded screen;

Obtain the impedance operator of grounded screen conductor;

According to the impedance operator of described grounded screen conductor and the boundary element model of foundation, calculate the stake resistance of grounded screen;

Obtain total failare electric current and the diverting coefficient of grounded screen; Specifically comprise step: determine first the structural parameters of circuit in the electrical network, the structural parameters of transformer, the ground connection parameter of grounding net of transformer substation; According to the method for operation of electrical network, the structural parameters of circuit, transformer, grounding net of transformer substation are carried out the modeling of phase component; According to the phase component model of the circuit of cyclic current method and foundation, transformer, grounding net of transformer substation, find the solution the fault current distribution of electrical network, thereby obtain diverting coefficient;

According to the total failare electric current of described grounded screen, described diverting coefficient and described stake resistance, determine the potential rise a large amount that grounded screen causes;

Device parameter corresponding to potential rise a large amount regulated ground net that causes according to described grounded screen.

2. the detection method of design of grounding grid of substation according to claim 1 is characterized in that,

When setting up the boundary element model of grounded screen, utilize the spatial relationship on grounded screen conductor and border that the grounded screen boundary element is carried out the self-adaptation subdivision, set up the boundary element model of ultra-large grounded screen according to the boundary element behind the subdivision.

3. the detection method of design of grounding grid of substation according to claim 1 is characterized in that,

Adopt matrix algorithms to calculate the stake resistance of described grounded screen.

4. the detection method of design of grounding grid of substation according to claim 1 is characterized in that,

Adopt parallel LU decomposition algorithm to calculate described stake resistance.

5. the pick-up unit of a design of grounding grid of substation is characterized in that, comprising:

Model is set up the unit, is used for setting up the boundary element model of grounded screen;

The first acquiring unit is for the impedance operator of obtaining the grounded screen conductor;

The first computing unit is used for according to the impedance operator of described grounded screen conductor and the boundary element model of foundation, calculates the stake resistance of grounded screen;

Second acquisition unit is for the total failare electric current and the diverting coefficient that obtain grounded screen; Specifically comprise: determine first the structural parameters of circuit in the electrical network, the structural parameters of transformer, the ground connection parameter of grounding net of transformer substation; According to the method for operation of electrical network, the structural parameters of circuit, transformer, grounding net of transformer substation are carried out the modeling of phase component; According to the phase component model of the circuit of cyclic current method and foundation, transformer, grounding net of transformer substation, find the solution the fault current distribution of electrical network, thereby obtain diverting coefficient;

The second computing unit is used for according to the total failare electric current of described grounded screen, described diverting coefficient and described stake resistance, determines the potential rise a large amount that grounded screen causes;

Regulon is used for device parameter corresponding to potential rise a large amount regulated ground net that causes according to described grounded screen.

6. the pick-up unit of design of grounding grid of substation according to claim 5 is characterized in that,

Described model is set up the unit when setting up the boundary element model of grounded screen, utilizes the spatial relationship on grounded screen conductor and border that the grounded screen boundary element is carried out the self-adaptation subdivision, sets up the boundary element model of ultra-large grounded screen according to the boundary element behind the subdivision.

7. the pick-up unit of design of grounding grid of substation according to claim 5 is characterized in that,

Described the first computing unit adopts matrix algorithms to calculate the stake resistance of described grounded screen.

8. the pick-up unit of design of grounding grid of substation according to claim 5 is characterized in that,

Described the first computing unit adopts parallel LU decomposition algorithm to calculate described stake resistance.

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