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Detection method and device for design of grounding grid of substation

A technology of a substation grounding grid and a detection method, applied in the field of substations, can solve problems such as threatening the life safety of staff, affecting power transmission, and abnormal operation of electrical equipment, and achieving the effect of ensuring life safety and normal power transmission.

Active Publication Date: 2013-10-30
ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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AI Technical Summary

Problems solved by technology

In the equipotential grounding design, the inductive component is neglected, which may cause the calculated maximum potential rise of the grounding grid to be relatively low, threatening the life safety of the staff, abnormal operation of electrical equipment, and affecting normal power transmission.

Method used

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  • Detection method and device for design of grounding grid of substation
  • Detection method and device for design of grounding grid of substation
  • Detection method and device for design of grounding grid of substation

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Embodiment Construction

[0027] In order to facilitate the understanding of the present invention, the following description will be made with reference to the accompanying drawings.

[0028] Please refer to figure 1 , the present invention provides a detection method for the design of the substation grounding grid, comprising the steps of:

[0029] 101. Establish a grounding grid boundary model;

[0030] 102. Obtain the impedance characteristic of the grounding grid conductor;

[0031] 103. Calculate the grounding resistance according to the boundary model and impedance characteristics;

[0032] According to the impedance characteristics of the grounding grid conductors and the established boundary element model, the grounding resistance of the grounding grid is calculated.

[0033] Concrete: Boundary element charge density η i The following conditions are met:

[0034] η i = - 1 2 π ...

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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

technical field [0001] The invention relates to a substation of a power system, in particular to a detection method and device for the design of a substation grounding grid. Background technique [0002] The grounding grid plays an extremely important role in the safe operation of the substation. It not only provides a common reference ground for various electrical equipment in the substation, but also drains the fault current and reduces the ground potential rise of the substation when the system fails, thus ensuring the work in the substation. Personal safety of personnel and the normal operation of various electrical equipment. [0003] An important goal of ground grid design is to control the maximum potential rise of the ground grid. Among them, the potential rise caused by the grounding grid: V=RI; R represents the grounding resistance, I represents the ground fault current, and I=Ie×(1-Ke), Ie is the total fault current, and Ke is the shunt coefficient. The steel gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R31/08G01R27/18
Inventor 方义治胡志广黄培专梁育雄吴伟文高春河钟志华
Owner ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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