MODE OF MEASURING OF AN OHM COMPONENT OF THE POTENTIAL OF A METALLIC UNDERGROUND STRUCTURE Russian patent published in 2006 - IPC G01R19/00 

FIELD: the invention refers to measuring technique for definition of an ohm component of potential at controlling the protection of the material of an underground current guiding structure, for example, of a pipeline, from electrochemical corrosion.

SUBSTANCE: the essence of the invention is in influencing on a metallic underground structure with an alternate current from a mobile source of current. Difference of potentials U₁ between the structure and an electrode of comparison on an alternate current is measured. The gradients of potentials DU_1, DU₂ in the ground between the electrodes of comparison at influencing correspondingly of an alternate current and on a constant current when the mobile source of current is switched off. The ohm component of the potential of the structure U₀ in accordance with the formula U₀=U₁.DU₂/DU₁.

EFFECT: decreases errors in measuring of an ohm component of potential and as a result of polarized potential at simultaneous provision of simplicity and comfort of work in field conditions.

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