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Accurate and reliable soil resistivity data is crucial in producing an earthing design that is efficient and effective. The errors introduced because of inductive coupling effects in soil resistivity measurements is easily and often overlooked.
This paper will highlight factors which can contribute to inductive coupling in soil resistivity measurements using the traditional methods. A theoretical analysis is conducted to show the factors contributing to the induced voltages on the cable. These factors include, but are not limited to, distances between cables, frequency of the current injection and the amplitude of the current. This theoretical analysis is proceeded by experimental investigation.
Two different earth testers shall be used to test the soil resistivity across different terrain using a range of frequencies, amplitude etc.
The findings will underscore the importance of having correct test equipment and procedures for relevant application in order to improve accuracy of the earth grids and safety of electrical installations.