FIELD: electrical equipment.
SUBSTANCE: invention relates to electrical equipment. Method consists in obtaining of a steady-state signal on this interval by separating from the transient process signal of signal of the specially received positive envelope signal, which change repeats the free-mode signal module change, provided that included into the structure the free-mode transition process incoming signal is unipolar.
EFFECT: technical result consists in increase in the situation recognition reliability by the relay protection and emergency control automatics measuring device on the transient process existence time interval in the alternating current electricity supply system.
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