FIELD: electrical engineering, specifically, relay protection and automatics devices. SUBSTANCE: increased efficiency of protection of equipment against rise of voltage if it is of oscillatory nature which is technical result of invention is realized by way of organization of calculation of real capability of insulation of protected equipment to withstand single rise of voltage without any damage to insulation and by way of monitoring of depletion of total resource of insulation. EFFECT: increased efficiency of protection of equipment against rise of voltage of oscillatory nature. 4 cl, 2 dwg, 1 tbl
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