Method for building equivalent grounding network computation model

A technology for calculating models and ground grids, which is applied in the direction of ground resistance measurement, etc.

Inactive Publication Date: 2010-12-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology

[0004] The method for establishing an equivalent ground grid calculation model provided by the present invention aims at the problem that the real situation of the ground grid cannot be equivalent to the hemispherical ground electrode in the process of measuring the ground resistance of power generation and substations in the power system by using the short-distance measurement method. The method of moments calculates and summarizes the potential distribution of the ground grid, and establishes an equivalent ground grid calculation model applicable to short distances

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  • Method for building equivalent grounding network computation model
  • Method for building equivalent grounding network computation model
  • Method for building equivalent grounding network computation model

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Embodiment Construction

[0045] A kind of preferred embodiment of the present invention is described in detail below:

[0046] The method provided by the invention comprises the following steps:

[0047] Step 1. Select the position of the current electrode according to the site conditions;

[0048]Step 2, according to the actual shape of the specific ground grid, use the numerical calculation method to simulate the potential distribution of the ground grid when there is no current pole, and obtain the ground potential distribution curve and ground potential rise (GPR) V1 of the ground grid;

[0049] Step 3, according to the actual shape of the specific ground grid, use the numerical calculation method to simulate the potential distribution of the ground grid when there is a current pole, and obtain the ground potential distribution curve and the ground potential rise (GPR) V2 of the ground grid;

[0050] Step 4. After obtaining the potential distribution law of the grounding grid with or without curr...

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Abstract

The invention relates to a method for building an equivalent grounding network computation model, comprising the following steps of: selecting a position of a current electrode, then respectively carrying out simulated computation on potential distribution of a grounding network when the current electrode is absent and existent by using a point matching moment method according to the actual shape of a grounding body, and further building the equivalent ground network computation model which can be suitable for short-distance measurement of a grounding resistor. The method for building the equivalent ground network computation model carries out summarization and conclusion on the potential distribution rule of the grounding network, builds the equivalent grounding network computation model which is suitable for the short-distance measurement of the grounding resistor and has an important engineering practical value.

Description

technical field [0001] The invention relates to the field of establishing calculation models of equivalent ground grids of power generation and substations in power systems, in particular to a method for establishing equivalent ground grid calculation models when using a short-distance measurement method to measure the grounding resistance of substation ground grids. Background technique [0002] At present, the commonly used grounding resistance measurement methods in the power sector are mainly the potential drop measurement theory developed in the 1960s and its derived compensation methods such as the 0.618 method and the 30-degree angle method. However, with the increase of the scale of the ground network, the workload of measuring the ground resistance by using the 0.618 method and the 30-degree angle method is increasing, and the interference problem is also becoming more and more serious. Therefore, there is an urgent need for a measurement method that can shorten the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
Inventor 施伟斌金之俭金伟徐剑王丰华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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