Abstract
We consider the basic principles and potentials of noncontact measurements of currents for control over corrosion protection of underground steel pipelines. The characteristics of the magnetic field and a solution of the inverse problem for a rectilinear current are analyzed. The necessary and sufficient conditions for the determination of current on measurements of the magnetic field above the route are formulated. We describe algorithms, an example of using a BIT-3 noncontact current meter, and full-scale tests for the insulation control and cathodic protection of a main gas pipeline.
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