Method for testing step voltage and touch voltage of grounding grid

A technology of contact voltage and step voltage, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of too long current electrode pay-off, cumbersome detection process, etc., to achieve short pay-off distance, avoid measurement Large error and workload, the effect of simplifying the inspection process

Inactive Publication Date: 2016-11-09
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a short current electrode method for testing the step voltage and contact voltage of the ground network, which can solve the problem that

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  • Method for testing step voltage and touch voltage of grounding grid
  • Method for testing step voltage and touch voltage of grounding grid
  • Method for testing step voltage and touch voltage of grounding grid

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Embodiment Construction

[0035] Consider the unequal spacing arrangement of the horizontal conductors of the large grounding grid. Take the grounding grid of the UHV Jindongnan Substation as an example. Its size is (314×357)m 2 . In order to facilitate modeling, the model is simplified to (360×360)m 2 Square ground net. The horizontal conductors are arranged at unequal intervals, the compression ratio is 0.68, the buried depth is 1.2m, the conductor equivalent radius is 0.012m, and the number of horizontal conductors is 62. The grounding grid model, observing the diagonal and the current pole position are as follows figure 1 Shown. The soil resistivity is 100Ω·m, the fault current in the actual ground network is 45kA; the test loop current frequency is 50Hz, the amplitude is 60A, and the injection points are all at the center of the ground network.

[0036] In the case of uniform soil:

[0037] According to theoretical analysis and engineering practice experience, the maximum step voltage of the square gr...

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Abstract

The invention relates to a method for testing a step voltage and a touch voltage of a grounding grid, and especially relates to a short current electrode method for testing a step voltage and a touch voltage of a grounding grid. The test cost can be significantly reduced and the test efficiency is improved by proper reduction of a lay out of route distance of the current electrode under the premise of assurance of the test accuracy. The method for testing the step voltage and the touch voltage of the grounding grid influences step voltage and touch voltage test errors, and provides a selection principle of the current electrode lay out of route distance in a large grounding grid test. The selection principle is verified in the test of a super high voltage transformer station grounding grid, and test results well verify the accuracy and high efficiency of the short current electrode testing method provided by the invention.

Description

Technical field [0001] The invention belongs to a voltage measurement method, and specifically relates to a method that can shorten the setting distance of a current electrode on the basis of ensuring the measurement accuracy. Background technique [0002] The test of step voltage and contact voltage is affected by many factors and has long been a technical problem that plagued the power sector. Large-scale grounding grid refers specifically to the substation grounding grid with a voltage level of 500kV and above. Compared with general grounding grids, large grounding grids occupies a large area, are complex in structure, and have a variety of connected devices, and the distribution of ground potential under the action of fault current is extremely uneven. Therefore, measuring the step voltage and contact voltage of a large grounding grid point by point is a huge workload. Usually, the area where the maximum value may appear or the area where personnel frequently move is selecte...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 邓长征肖东邱立赵自威傅天弈
Owner CHINA THREE GORGES UNIV
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