Characteristic current signal identification method for transformer area topology carding

The invention relates to the field of low-voltage power distribution networks, and discloses a characteristic current signal identification method for transformer area topology carding, which comprises the following steps: a sending end detects a voltage upward zero crossing point, and switches a characteristic current when the upward zero crossing point is detected; the receiving end filters and samples the current; a receiving end detects a voltage upward zero crossing point, when the upward zero crossing point is detected, a sliding window takes and stores a sampling current, and power frequency and integer harmonic waves are removed through subtraction of adjacent power frequency cyclic waves; the receiving end carries out serialization processing on the processed data; the receiving end solves correlation coefficients of the front and rear groups of sequences obtained after processing and the front and rear groups of standard sequences pre-stored locally; judging whether the signal identification succeed