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Influence of earth conductivity and permittivity frequency dependence in electromagnetic transient phenomena - more measurements results in new sites

In this work some procedures to measure and model soil electromagnetic behavior in frequency domain are presented. The proposed model takes into account the earth conductivity and permittivity frequency dependence, which normally are not considered. Some procedures to reduce noise signals in the field measurements values are presented. For an actual 440 kV single three-phase transmission line, the importance to consider the soil behavior is represented through a unique real value of conductance (the normal approach) and through the proposed model.