Multi-frequency scanning type tower grounding resistance measurement apparatus and method

A grounding resistance, multi-frequency scanning technology, applied in grounding resistance measurement and other directions, can solve problems such as many restrictions, disconnecting grounding leads, large errors, etc., to achieve the effect of extremely simple layout and improved efficiency

Active Publication Date: 2014-11-19
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Generally speaking, the current grounding resistance measurement methods have their own deficiencies, mainly manifested in: the need to disconnect the grounding lead, many restrictions, large errors, etc. Therefor

Method used

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  • Multi-frequency scanning type tower grounding resistance measurement apparatus and method
  • Multi-frequency scanning type tower grounding resistance measurement apparatus and method
  • Multi-frequency scanning type tower grounding resistance measurement apparatus and method

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Experimental program
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Effect test

Embodiment

[0130] On-the-spot measurement is carried out on the basis of the technical scheme of the present invention, and data is further analyzed:

[0131] In order to verify the effectiveness and accuracy of the multi-frequency scanning non-disconnected grounding lead measurement method, the actual tower was measured on the Shuangjin Line of Chongqing Jiangjin Bureau, and the test and data analysis were carried out. The measured data are as follows:

[0132] Table 1 field test data

[0133] Fig.1.field survey test data

[0134] Current frequency / kHz Measuring voltage / V Measuring current / A Z(f) / Ω Z'(f) / Ω / kHz 1 0.227 0.266 0.852 0.320 1.1 0.238 0.269 0.884 2 0.240 0.263 0.912 0.169

[0135] 2.2 0.241 0.255 0.946 3 0.244 0.254 0.952 0.097 3.3 0.241 0.246 0.981 4 0.234 0.235 0.992 0.061 4.4 0.230 0.226 1.014 5 0.226 0.223 1.015 0.013 5.5 0.221 0.216 1.021 6 0.216 0....

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Abstract

Disclosed are a multi-frequency scanning type high-voltage tower grounding resistance measurement apparatus and method. Included are an on-site measuring device and a background data processing center; the on-site measuring device comprises a power supply module for supplying power, an automatic sweep excitation source module for injecting currents of different frequencies, a signal acquisition module, a central processor module for control, a liquid crystal display module, a GPRS wireless communication module and a serial data output module; and the power supply module, the automatic sweep excitation source module, the signal acquisition module, the liquid crystal display module, the GPRS wireless communication module and the serial data output module are respectively connected to the central processor module, and the automatic sweep excitation source module and the GPRS wireless communication module are respectively connected to the signal acquisition module. The measurement apparatus and method are simple in wiring, and require no need of disconnecting a ground lead; the efficiency of the ground resistance measurement is improved to a great extent; and the multi-frequency scanning measurement method can avoid the effects of tower grounding inductance on measurement.

Description

technical field [0001] The invention relates to the technical field of tower grounding resistance measurement, in particular to a multi-frequency scanning high-voltage tower grounding resistance measurement method and device. Background technique [0002] As the connection hub of the power system, the high-voltage transmission line has a complex operating environment and is prone to lightning strikes. As one of the most basic lightning protection measures for transmission lines, the lightning protection line not only protects the line from direct lightning strikes, but also forms a discharge channel for lightning current together with supporting towers and grounding devices. The grounding device is composed of a grounding body and a grounding lead wire buried in the ground, which is the most important part of the entire leakage channel, and the grounding resistance is the main parameter to measure the grounding device. When the lightning current flows into the ground throug...

Claims

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Application Information

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IPC IPC(8): G01R27/20
Inventor 刘国华朱云祥于洪来柴松刚李为程来
Owner STATE GRID CORP OF CHINA
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