Grounding Grid Integrity

Damages can be detected at two levels, globally by impedance measurements in access points to the grounding system and in local scale by either leading a current of known frequency through the grid or by inductive methods whereby eddy currents are created in the wires, generating anomalies that can be measured on the surface. The report describes suggested methods for doing this and presents a possible design for evaluating these methods through laboratory and field tests.

The report includes short chapters regarding the purpose and function of the grounding system in substations and how to evaluate the resistivity of the ground layers.