Device and method for measuring impact current divergence characteristics of earth electrode

Abstract

The invention relates to a device and a method for measuring impact current divergence characteristics of an earth electrode, belonging to the technical field of analog experiments of an earthing device. The device mainly comprises an impact current generator, a hemispherical test groove, an analog earth electrode, a current sensor, a high-speed data collecting card, a control processing module, a display module, and the like. According to the method, the impact current divergence characteristics of the earth electrode are obtained by utilizing the device through the steps of determining an analog test proportional scale and adjusting analog test conditions, connecting an analog test loop, setting control processing parameters, collecting and processing test data and the like. The device has the characteristics of being simple and convenient to operate, high in measuring efficiency, accurate in measuring result, wide in application range and the like. The device and the method can be widely applied to measuring the impact current divergence characteristics of the earth electrode under the effect of large current impact, and is particularly suitable for measuring the impact current divergence characteristics of the earth electrode under the effect of lightning current under the conditions of non-uniform soil and complex topography.

Description

technical field [0001] The invention belongs to the technical field of simulation tests of grounding devices, and in particular relates to a measuring device and method for grounding electrode impact dispersion characteristics of a grounding device. Background technique [0002] Due to the complexity of the time-varying electric field generated when the fault current, operating current or impulse lightning current discharges through the grounding device, it is difficult to derive a more accurate mathematical expression theoretically, and to reveal the safety performance of the grounding device from the perspective of experiments It has always been an important means of grounding performance research. Measuring the impact dissipation characteristics of grounding electrodes through simulation tests can comprehensively study the dispersion law of grounding electrodes and scientifically predict the lightning protection effect of transmission lines. [0003] There are existing m...

AI Technical Summary

Problems solved by technology

The main disadvantages of this patent are: ① only the impact grounding impedance value of the grounding electrode can be obtained, and other impact characteristics of the grounding electrode, such as the distribution of impact dispersion, etc.; ② Due to the constraints of transportation and many other conditions, the simulation test The amplitude of the impulse current is small, and it cannot simulate the soil discharge process when the actual lightning current spreads to the surrounding soil through the grounding device.

The main disadvantages of this patent are: ① This invention can simulate the soil discharge process when the actual lightning current flows to the surrounding soil through the grounding device, but when measuring the distribution of the impact flow, it is necessary to change the layout position of the current sensor repeatedly, which is complicated to operate , and the measurement efficiency is low; ② the invention obtains the diffuse current value of each small section of grounding conductor by calculating the difference between the axial current values ​​of two adjacent measurement points, which can only reflect the diffuse current situation of each small section of grounding electrode conductor, and cannot reflect Grounding electrode leakage current in different positions in soil, especially in uneven soil

Images