瓦特表法与电流电压法在大地网接地电阻检测中的对比

Comparison of the wattmeter method and current-voltage method in grounding resistance detection

通过对某电站的主接地网接地电阻进行测试,为其防雷接地工作提供参考,保证电气设备安全可靠地运行。本次测试采用三极直线法布置。为节省人力、物力,利用发电站中220 kV架空输电线路两相作为电流极与电压极连接线路,在测试后用瓦特表法和电流电压法计算接地电阻值,并对其比对结果进行分析,得出瓦特表法可以在计算接地网电阻中得到更为精确结果的结论。

Through the tests of the grounding resistance for the main grounding grid, to provide reference for the anti-lightening and ensure the safety and reliability for the system. In the test, the tertiary layout has been used. In order to save the human power and material, the 220 kV overhead transmission line has been used as the combination line between the current and voltage polar. The grounding resistance has been calculated by wattmeter method and current-voltage method after testing. The results show that the wattmeter method is more accurate.