System for measuring electrical power, transformation unit comprising such a system and method for measuring electrical power using such a system

This system (20) is designed to measure the electrical power of a current flowing in at least one secondary conductor (42A, 44A, 46A,..., 42N, 44N, 46N) connected to a primary conductor (34, 36, 38), the primary conductor (34, 36, 38) and secondary conductor (42A,..., 46N) having the same voltage. This measurement system (20) comprises a primary module (60) comprising a radioelectric emitter (70) and a unit (66) for measuring the voltage across the primary conductor (34, 36, 38), at least one secondary module (62A,..., 62N) comprising a radioelectric receiver (80A,..., 80N), a sensor (76A,..., 76N) of the current density in the secondary conductor (42A,..., 46N), and a unit (126A,..., 126N) for calculating the electrical power of said current in the secondary conductor. The primary module (60) comprises first means (104) of compressing the value of the measured voltage (V1, V2, V3) and means (106) for transmitting, to each secondary module (62A,..., 62N), a message (M1) containing the compressed value of the measured voltage. The measurement system (20) comprises means (106, 120A, 120N, 122A,..., 122N) for temporally synchronizing each current density sensor (76A,..., 76N) relative to the unit (66) for measuring the voltage. The calculating unit (126A,..., 126N) is connected to the radioelectric receiver (80A,..., 80N) and is able to calculate the electrical power from the value of the voltage received from the primary module (60) and the measured current density value.