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Novel grounding network grounding resistance inverse short-distance measurement method and apparatus

A technology of ground resistance and measurement method, which is applied in the field of short-distance measurement method and measurement device of ground resistance of substation ground grid, can solve the problems that the measurement method and structure cannot meet the reverse short-distance measurement, and achieve the goal of reducing interference and eliminating mutual inductance of lead wires effect of influence

Active Publication Date: 2016-09-21
CHONGQING UNIV
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Problems solved by technology

[0009] Since the structure of the measuring device also changes significantly during the reverse short-distance measurement, the measurement method and structure of the existing device cannot meet the needs of the reverse short-distance measurement.

Method used

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  • Novel grounding network grounding resistance inverse short-distance measurement method and apparatus
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  • Novel grounding network grounding resistance inverse short-distance measurement method and apparatus

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Embodiment Construction

[0066] The steps of the measurement method to achieve the purpose of the present invention are as follows:

[0067] Step 1. Observe the terrain and choose an open area 2D~2.5D away from the grounding grid that has relatively flat soil, less plant coverage, and no influence of underground pipelines to arrange auxiliary current poles. Auxiliary current poles can be selected as a single pole or multiple poles in parallel in a star arrangement. The current pole and the grounding grid are respectively connected to the two output terminals of the measuring power supply through current leads.

[0068] Step 2. Set the test output current amplitude and frequency, measure and calculate the voltage between the grounding grid and the auxiliary current pole.

[0069] Step 3. Starting from the direction parallel or perpendicular to the current lead path, connect the auxiliary current electrode and the voltage electrode with the voltage lead of the voltage measuring device, and measure the voltage ...

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Abstract

The invention discloses a novel grounding network grounding resistance inverse short-distance measurement method and apparatus and provides a grounding network grounding resistance inverse short-distance measurement method and apparatus, for solving the problems of long lead wire, large mutual inductance, small effective signals and the like in conventional grounding network grounding resistance measurement. A current lead wire is shortened to 2D to 2.5D, a voltage lead wire is connected with an auxiliary current electrode and a voltage electrode, and through measurement of ground potential distribution distanced 3 to 20m away from the auxiliary current electrode and combination with an analysis calculation formula of potential of the auxiliary current electrode, a potential distribution formula of the auxiliary current electrode is calculated. Through combination with loop voltage reduction and ground potential distribution rules, ground potential rise of a grounding network and grounding resistance of the grounding network are obtained. The measurement apparatus mainly comprises a different-frequency power supply, a host, a mobile voltage measurement module, a standard auxiliary current electrode, the current lead wire, the voltage lead wire and a combined auxiliary voltage electrode. The grounding resistance measurement method and apparatus have the advantages of short measurement lead wires, small mutual inductance influences, large effective signals, high anti-interference capability, accurate measurement positioning, fast and convenient measurement and the like.

Description

Technical field [0001] The invention belongs to the technical field of power system grounding, and particularly relates to a short-distance measurement method and a measuring device for the grounding resistance of a substation grounding grid. Background technique [0002] With the construction of the UHV transmission system and the expansion of the power grid, the number of ultra-large-scale hub substations is increasing, and the size of the grounding grid is far beyond the level of ten years ago. The hub substation plays an important role in sending the energy of the UHV transmission system and ensuring the power supply to the society in the power grid. The reliability of its grounding grid performance is of great significance to ensuring the safety of my country's power. [0003] Grounding resistance is an important indicator for evaluating the performance of grounding grids. Grounding resistance measurement is an important and long-term measurement experiment in power systems. ...

Claims

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Application Information

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IPC IPC(8): G01R27/20
CPCG01R27/20
Inventor 袁涛司马文霞杨鸣白洋罗东辉鲜呈晨
Owner CHONGQING UNIV
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