FIELD: electricity.
SUBSTANCE: polarisation potential of metallic subsurface structures is determined without switching off cathodic protection station by measurement of potentials difference "pipe-ground". Measuring device is switched on between cathode terminal and reference electrode installed on ground surface above pipeline axis (or near it). In order to eliminate resistive component of protection potential measurements are done using oscilloscope by means of counting potential of metal pipe in the moments of pauses between pulses of protective current by its gauged screen.
EFFECT: on-the-spot measurement of polarisation potential of metallic subsurface structures.
1 dwg
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