四端子法在光伏电站接地连续性测试中的应用

Application of Four-electrode Method in Grounding Continuity Test of Photovoltaic Power Station

研究四端子法在测试光伏电站接地连续性中的应用,首先比对两端子法和四端子法2种测试方法,发现四端子法准确性、重复性更高,更适合光伏电站导通性测量和分析;其次采用四端子法对3个典型的光伏电站进行接地连续性测试,发现连接部件材料锈蚀松动、使用塑胶垫片、绝缘皮残留3种典型的失效原因。

This paper studies the application of four-electrode method in testing the grounding continuity of photovoltaic power station.Firstly,the two-electrode method and the four-electrode method are compared,and it is found that the fourelectrode method is more accurate and repeatable,which is more suitable for the measurement and analysis of the photovoltaic power station conductivity.Secondly,the four-electrode method is used to test the grounding continuity of three typical photovoltaic power stations,and three typical failure reasons are found,namely,the corrosion and looseness of connecting parts,the use of plastic gasket and the residual insulation skin.