CN106018943A - Potential distribution measurement method for grounding electrode - Google Patents

Abstract

The invention provides a potential distribution measurement method for a grounding electrode. The method comprises: according to the location and topographic condition of a grounding electrode, n measuring points from A1 to An are selected; distances xn between the n measuring points and the central point O of the grounding electrode are obtained respectively; two points with the distance of Ln in an OAn direction is selected by using the An as the center, a potential difference Un between the two points is measured, and a ground current Ic of the grounding electrode is measured; according to a maximum ground current Imax of the grounding electrode, potential difference conversion is carried out to obtain U'n; and on the basis of the U'n, potential values of the measuring points are calculated and a potential distribution map is obtained based on the potential values. According to the invention, the method has advantages of small measuring error, saved resources, high reliability and practicability.

Description

A kind of earthing pole Potential distribution measuring method

Technical field

The present invention relates to current conversion station earthing pole field, be specifically related to a kind of earthing pole Potential distribution measuring method.

Background technology

High voltage dc transmission technology has realized large-scale application, and earthing pole is as the important component part of DC transmission system, and it is right The impact of surrounding can not be ignored, and earthing pole potential measurement is the important means of analysis grounding pole effect on environment.Current survey Metering method, measures workload huge, needs manually to set the test circuit of more than 10km；There is unwrapping wire difficulty, disturb big, work Work amount is big, measure the problems such as inconvenience.

Summary of the invention

The present invention provides a kind of simplicity, practical earthing pole Potential distribution measuring method.

The technical solution used in the present invention is: a kind of earthing pole Potential distribution measuring method, comprises the following steps:

According to earthing pole present position and orographic condition, n is selected to measure some A₁…A_n；

Obtain n distance x measuring point and earthing pole central point O respectively_n；

With A_nCentered by, OA_nOn direction, chosen distance is L_n2 points, potential difference U between measuring at 2_n, measure simultaneously Earthing pole earth current I_c；

According to earthing pole maximum earth current I_max, carry out potential difference conversion according to the following equation and obtain U '_n,

U′_n=U_n·I_max/I_c；

According to U '_nThe potential value of computation and measurement point, obtains potential image according to potential value.

Further, a described measurement point A_nAnd the distance between O point is less than 10km.

Further, a described measurement point A_nBetween earthing pole key store O and offside current conversion station B, rectilinear direction angle is In the range of ± 30 °.

Further, described L_nSpan be, 10m≤L_n≤100m。

Further, described L_nSpan be, 10m≤L₁≤L₂…≤L_n≤100m。

Further, described A_nAnd the distance between O is the least, A_n-A_n-1Value the least.

Further, the described potential value computational methods measuring point are integration by parts.

The invention has the beneficial effects as follows:

(1) present invention can reduce the workload of earthing pole potential measurement, it is not necessary to artificial distance unwrapping wire, on ground with a varied topography District's effect is the most notable；

(2) present invention can measure by multiple spot simultaneously, reduces owing to earthing pole earth current changes the measurement error brought；

(3) present invention can economize on resources, human cost, and reliability is high, practical.

Accompanying drawing explanation

Fig. 1 is schematic diagram of the present invention.

Fig. 2 is the Potential distribution curve synoptic diagram that the present invention obtains.

Detailed description of the invention

The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.

A kind of earthing pole Potential distribution measuring method, comprises the following steps:

According to earthing pole present position and orographic condition, n is selected to measure some A₁…A_n；

Obtain n distance x measuring point and earthing pole central point O respectively_n；

With A_nCentered by, OA_nOn direction, chosen distance is L_n2 points, potential difference U between measuring at 2_n, measure simultaneously Earthing pole earth current I_c；

According to earthing pole maximum earth current I_max, carry out potential difference conversion according to the following equation and obtain U '_n,

U′_n=U_n·I_max/I_c；

According to U '_nThe potential value of computation and measurement point, obtains potential image according to potential value.

First obtain earthing pole design drawing, arrange including interior polar ring (R1), outer polar ring (R2) radius and principal set up thereof, The coordinate of earthing pole central point O is obtained with high-precision GPS position finder or other location instruments；Selection of measuring point divides on ground, Ground moistening, the place of uniform resistivity；Obtain with location instrument and measure point coordinates and A₁…A_n, A_nAnd between O point away from From x_n(x_nDirectly calculate according to measuring coordinate)；Difference according to the actual requirements, determines measure dot number n.

Further, a described measurement point A_nAnd the distance between O point is less than 10km.

Further, a described measurement point A_nBetween earthing pole key store O and offside current conversion station B, rectilinear direction angle is In the range of ± 30 °；Measure some A₁…A_nCan not be on the same line.

Further, described L_nSpan be, 10m≤L_n≤100m；And 10m≤L₁≤L₂…≤L_n≤100m；This choose Method can reduce measurement error.

Further, described A_nAnd the distance between O is the least, A_n-A_n-1Value the least；The place that distance O point is the nearest, surveys Amount point distribution is the most intensive.

Further, the described potential value computational methods measuring point are integration by parts；Circular is as follows:

A_nElectric field intensity E at Dian_n≈U′_n/L_n；

According to Theory of Electromagnetic Field: the metal hemisphere being embedded in ground, when there being electric current to be leaked into the earth by hemisphere, uniform at soil resistivity Time, electric current line is equably along ball radial emission, therefore the electric current density away from centre of sphere distance x is:

$\mathrm{\σ}\left(x\right)=\frac{I}{2{\mathrm{\πx}}^2};$

In formula: σ be away from the centre of sphere be the electric current density on sphere, amperes per square meter at x；

I is that grounding body flows into earth current, unit ampere；

X is away from centre of sphere distance, unit rice.

Electric field intensity at distance centre of sphere x rice is:

$E\left(x\right)=\mathrm{\ρ}\mathrm{\σ}\left(x\right)=\frac{\mathrm{\ρ}I}{2{\mathrm{\πx}}^2}$

In formula: ρ is soil resistivity.

Measure A_n(radius is x_n) to the potential difference of infinite point be

$U\left(x_n\right)={\∫}_{\mathrm{\∞}}^{x_n}-{\mathrm{Edx}}_n={\∫}_{\mathrm{\∞}}^{x_n}-\frac{\mathrm{\ρ}I}{2{\mathrm{\πx}}^2}dx=\frac{\mathrm{\ρ}I}{2{\mathrm{\πx}}_n}=x_n\·E\left(x_n\right)$

x_nWith E (x_n) it is given data, substitute into above formula and can draw A_nThe earth potential at place.

According to integral principle, A_n-1The potential difference of infinite point is by point

$U\left(x_{n-1}\right)={\∫}_{\mathrm{\∞}}^{x_{n-1}}-E\left(x\right)dx={\∫}_{x_n}^{x_{n-1}}-E\left(x\right)dx+{\∫}_{\mathrm{\∞}}^{x_n}-E\left(x\right)dx=\frac{x_{n-1}(x_n-x_{n-1})}{x_n}\·E\left(x_{n-1}\right)+x_n\·E\left(x_n\right)$

I.e. obtain A_n-1The earth potential at place；In like manner can get U (x_n-2)…U(x₁)；

With x_nFor abscissa, U (x_n) it is vertical coordinate, i.e. obtain earth potential distribution curve；

For x_nAnd x_n-1Between discontinuous point, available utilize U (x_n-1) form continuous print curve, i.e. distance O point x₁And x_n Between arbitrfary point all can calculate its earth potential value.

The present invention can the workload of significantly local earthing pole potential measurement, it is not necessary to artificial distance unwrapping wire, under non-plain topography, This measuring method effect is the most notable；And the present invention can measure at multiple spot simultaneously, can reduce because of earthing pole earth current change band The measurement error come, it is adaptable to the potential measurement under earthing pole normal operating conditions, is particularly suited in short-term during high-power test Measure；And measuring method disclosed by the invention is scientific and reasonable, it is possible to economize on resources to greatest extent, reliability is high, practicality By force.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and former Any amendment, equivalent and the improvement etc. made within then, should be included within the scope of the present invention.

Claims (7)

1. an earthing pole Potential distribution measuring method, it is characterised in that comprise the following steps:

According to earthing pole present position and orographic condition, n is selected to measure some A₁…A_n；

Obtain n distance x measuring point and earthing pole central point O respectively_n；

With A_nCentered by, OA_nOn direction, chosen distance is L_n2 points, potential difference U between measuring at 2_n, measure simultaneously Earthing pole earth current I_c；

According to earthing pole maximum earth current I_max, carry out potential difference conversion according to the following equation and obtain U '_n,

U′_n=U_n·I_max/I_c；

According to U '_nThe potential value of computation and measurement point, obtains potential image according to potential value.

A kind of earthing pole Potential distribution measuring method the most according to claim 1, it is characterised in that described measurement point A_n And the distance between O point is less than 10km.

A kind of earthing pole Potential distribution measuring method the most according to claim 1, it is characterised in that described measurement point A_n Between earthing pole key store O and offside current conversion station B, rectilinear direction angle is in the range of ± 30 °.

A kind of earthing pole Potential distribution measuring method the most according to claim 1, it is characterised in that described L_nValue Scope is, 10m≤L_n≤100m。

5. according to a kind of earthing pole Potential distribution measuring method described in claim 1 or 4, it is characterised in that described L_n's Span is, 10m≤L₁≤L₂…≤L_n≤100m。

A kind of earthing pole Potential distribution measuring method the most according to claim 1, it is characterised in that described A_nWith O it Between distance x_nThe least, A_n-A_n-1Value the least.

A kind of earthing pole Potential distribution measuring method the most according to claim 1, it is characterised in that the electricity of described measurement point Place value computational methods are integration by parts.