Method and device for accurately measuring grounding resistance of pole

Abstract

The invention discloses a method and device for accurately measuring the grounding resistance of a pole, and the method comprises the steps: judging the burying orientation of a grounding body through employing a magnetic field method; measuring the resistivity of soil nearby the grounding body through employing a quadrupole method; selecting the frequency range of an injection current according to the resistivity of soil, obtaining a group of pole grounding resistance measurement values through measurement, correcting the measurement result, and obtaining the accurate measurement value of the pole grounding resistance. The device and method can achieve the accurate measurement of the grounding resistance of the pole without cutting off a grounding lead. Firstly, the method and device achieve the vertical arrangement of poles through the judgment of the burying orientation of the grounding body, and improve the measurement accuracy; secondly, the method and device select the frequency of the injection current through the measurement of the resistivity of soil nearby the grounding body, and improves the adaptability of the method to different pole soil environments; finally, the method and device do not need to cut off the ground lead, and improve the work efficiency of grounding resistance measurement. A mean method is employed for calculating the grounding resistance of the pole, enables the measurement error to be minimum, and improves the accuracy of the measurement result.

Description

technical field [0001] The invention relates to the technical field of tower grounding resistance measurement, in particular to an accurate measurement method and device for tower grounding resistance. Background technique [0002] 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, and 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 through the leakage channel, the voltage drop on the grounding device will cause the lightning conductor to obtain a ground potential. If the grounding resistance is too large, it wi...

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Problems solved by technology

[0006] The three-pole method requires that the measuring electrodes be arranged vertically along the buried orientation of the grounding body during the measurement process. However, in engineering practice, due to factors such as the loss of construction drawings, the buried orientation of the grounding electrodes is often unknown, so vertical electrode layout is usually difficult to achieve. , so the measurement accuracy is difficult to be completely guaranteed

[0014] ① The embedding position of the grounding body is not clear;

[0015] ② The grounding lead needs to be disconnected, and the frequency of the injected current is single;

[0016] ③The influence of soil resistivity is not considered

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