Method for measuring grounded resistance of grounded screen by short range measuring method

A technology of ground resistance and measurement method, which is applied in the direction of ground resistance measurement, etc., and can solve problems such as excessive length error of measurement leads

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

[0004] The method for measuring the grounding resistance of the substation grounding grid provided by the present invention aims at the problems of too long measurement lead wires and large errors in the testing process of the grounding resistance of the power generation and substations in the power system. According to the principle of potential compensation, the method adopts Short current and voltage electrode leads enable short-distance earth resistance measurements

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  • Method for measuring grounded resistance of grounded screen by short range measuring method
  • Method for measuring grounded resistance of grounded screen by short range measuring method
  • Method for measuring grounded resistance of grounded screen by short range measuring method

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Embodiment Construction

[0046] A kind of preferred embodiment of the present invention is described in detail below:

[0047] The method provided by the invention comprises the following steps:

[0048] Step 1. Select the position of the current electrode according to the site conditions;

[0049] Step 2, according to the actual shape of the grounding grid to be tested, use a numerical calculation method to simulate the ground potential distribution of the grounding grid when there is no current pole, and obtain the ground potential distribution curve and ground potential rise (GPR) V1 of the grounding grid;

[0050] Step 3, according to the actual shape of the grounding grid to be tested, use a numerical calculation method to simulate the ground potential distribution of the grounding grid when there is a current pole, and obtain the ground potential distribution curve and ground potential rise (GPR) V2 of the grounding grid;

[0051]Step 4. According to the principle of potential compensation, the...

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Abstract

The invention relates to a method for measuring a grounded resistance of a grounded screen by a short range measuring method, which comprises the following steps: selecting the position of an current electrode; carrying out simulation calculation on the ground potential distribution of an earth screen without the current electrode and an earth screen with the current electrode according to the true form of the grounded screen to be measured by a numerical computing method so as to determine the position of a compensation point, i.e. the measuring position of a voltage electrode; and finally carrying out measurement to obtain the value of the ground resistance. The method for measuring the grounded resistance of a transformer substation by the short range measuring method provided by the invention adopts a shorter current electrode and a voltage electrode lead to realize measuring the grounded resistance by the short range measuring method according to the potential compensation principle, saves manpower and material resources, and has important project practical value.

Description

technical field [0001] The invention relates to the field of measuring the grounding resistance of the grounding grid of a power generation and substation in an electric power system, in particular to a method for measuring the grounding resistance of the substation grounding grid by using a short-distance measurement method. Background technique [0002] Grounding resistance is one of the important technical indicators to characterize the electrical performance of the grounding device. It refers to the ratio of the voltage U on the electrode to the current I when the current I flows into the earth through the grounding electrode. It includes the resistance of the grounding lead and the resistance of the grounding electrode body. , the contact resistance between the ground electrode and the soil and the soil resistance from the electrode to infinity. Since the grounding grid of the power generation and substation is responsible for discharging fault current, balancing the gr...

Claims

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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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