FIELD: electricity.
SUBSTANCE: additional DC sources with the drainage points to each adjacent underground structure, creating the protection zone on each of them, are connected to the electrical circuit of the electric protection plant by means of the drain cable, containing the direct current source. In each underground structure, the effective protection zone is defined according to the magnitude of the induced negative potential from minus 0.90 V up to minus 2.50 V from the connection point of the additional DC source up to the point on the protected structure in which the value of the structure longitudinal resistance will be equal to the value of the transition resistance "structure-earth", and the anode grounding is placed at the distance from the protected structure within the protection zone.
EFFECT: exclusion of anode zones, leading to corrosive structures, in the protected adjacent structures.
5 dwg, 3 tbl
