ES5.docx - Exp 5 Earth Electrode Resistance Measurement...

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Page| 52 Exp. 5- Earth Electrode Resistance Measurement Aim: SURABHI RAMAN 17BEE0029 To understand the working of an earth -tester and measure the Earth resistance and Apparatus Required Operating principle The principle used in measuring the earth resistance is based on simple ohms law. 4 electrodes A, B, C, Dare buried in theearth, the resistance of which is tobe tested at the distance of 20m from each other electrodes is shown in the figure.A.C. signal is applied to electrodes A and B and the voltage developed across B and C due to flow of current through the earth is measured by ammeter M. if current is constant, the voltage measured will be directly proportional to the earth resistance. Principle of measurement To find out resistance of earth connection, the 3 terminal method is to be used. A current is passed through the EARTH PLATE to an auxiliary electrode A in the earth at a distance away from the earth plate. A second auxiliary electrode B is inserted
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