The grounding resistance is the resistance encountered when a current flows from the grounding device into the ground and then flows through the earth to another grounding body or spreads to a distant place. The unit of measurement is Ω. The size of the grounding resistance can reflect the degree of contact between the electrical device and the "ground" and reflect the scale of the grounding grid.
The grounding resistance measurement method includes two-wire method, three-wire method, four-wire method, single-clamp method and double-clamp method. Each of the five methods has its own characteristics. When actually measuring, try to select the correct method and measuring tester to make the measurement. The results are accurate.
JYD grounding downlead conductivity tester (10A) is a highly automated portable tester developed by Kingrun company. It is used to measure the conduction resistance between grounding downlead of various power equipments in substations. The instrument is controlled by a high performance single chip computer, which can realize the intellectualization of the testing process.