The invention discloses a household
transformer relationship identification method and
system based on characteristic current signals. The household
transformer relationship identification method comprises the following steps that step 1, a
master station issues a household
transformer relationship identification command to a
smart meter with a characteristic current
signal sending function according to an electric meter address; step 2, a current
signal of a characteristic code bit is generated in an
electric network by using a resistance switching device, and the switching end time is recorded locally; step 3, a target
feature code bit on a power line is detected after the household transformer relationship identification command is received; 4, whether the target
feature code bit is successfully detected or not is judged by a terminal with an
alternating current collection function; and 5, the meter
switching time and the terminal identification time are measured by the
master station, the phase is identified, and the user transformer relationship is determined according to the time scale comparison. According to the method and the
system, power outage is not needed, the influence caused by "co-zero",
coupling and
crosstalk zone problems can be well overcome by controlling the strength of the sending characteristic current
signal, and the accurate identification of the household transformer relationship can be realized.