SECTION OF POWER-SUPPLY NETWORK WITH INDUSTRIAL PLANT WITH GROUNDED NEUTRAL WIRE Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: in compliance with invention extended grounded electrode with discrete or continuous current leak, for instance structural framework of industrial building or structure, is used as additional zero protective conductor which is connected in parallel to fourth cable conductor of power-supply network-zero protective conductor. Cable is laid in zone limited by two circular cylinders which axes coincide with that of hypothetical equivalent conductor substituting structural framework of industrial building or structure extended grounding electrode. Optimum distance between cable and axis of equivalent conductor is found from condition of minimum of potential-forming current. EFFECT: enhanced operational safety. 2 cl, 2 dwg