埋地金属导体对接地系统电阻测试影响试验分析

搭建试验地网研究土壤中金属导体对接地电阻的影响。通过埋设不同形状金属导体,改变金属导体埋设深度、与试验地网相对距离,在不同点位测量试验地网接地电阻值。分析试验数据发现,埋地金属导体导致接地电阻测量值偏小,其中环形金属导体对接地电阻测量值影响最大,一形金属导体对接地电阻测量值影响最小;金属导体位于测试电压极外侧相比位于内侧时,对接地电阻测量值的影响更大;金属导体位于测试电压极内侧时,不同测试点位接地电阻测量值差异较大,金属导体位于测试电压极外侧时,各点位接地电阻测量值差异不大;金属导体埋设深度对接地电阻测量值影响不明显。

Influence Experiment and Analysis of Buried-Metal Conductor on Resistance Test of Grounding Systems

The influence of a metal conductor in soil on ground resistance is studied by setting up the experimental ground grid. By embedding different shape metal conductors, changing the buried depth of metal conductors and the relative distance from the test grounding grid, the grounding resistance of the test grounding grid was measured at different points. Analysis of test data shows that the buried metal conductor leads to the smaller measured value of grounding resistance, among which the sguare shaped metal conductor has the greatest influence on the measured value of grounding resistance, and the line shaped metal conductor has the least influence on the measured value. When the metal conductor is located outside the test voltage pole, the influence on the measured value of grounding resistance is greater than that on the inside. When the metal conductor is located inside the test voltage pole, the measured value of grounding resistance at different test points is quite different. When the metal conductor is located outside the test voltage pole, the measured value of grounding resistance at each point has little difference. The buried depth of a metal conductor has no obvious influence on the measured value of grounding resistance.