Method and system for detecting noise in an electrical grid

A method and system for detecting a source of noise in an electrical grid distributing network implementing Power Line Communications (PLC), said electrical grid distributing network comprising a plurality of meters (51, 61, 71) respectively connected to a plurality of end-user networks, wherein said source of noise to be detected is originated in a device belonging to one of said end-user networks, wherein each of said meters (51, 61, 71) is connected to at least one pair of cables corresponding to at least one phase of the 3 phases of the electrical grid (R, S, T), said at least one pair of cables comprising a first cable (R A , S A , T A , N A ) belonging to said distributing network and a second cable (R B , S B , T B , N B ) belonging to a corresponding end-user network. The method comprises: at each of said meters (51, 61, 71), disposing an element (30, 40) behaving as a resistive element within the frequency band of the PLC, and behaving as a non-resistive element at the frequency of the electrical grid (DC, 50-60 Hz), between said first cable belonging to the distributing network (R A , S A , T A ) and said second cable belonging to the end-user network (R B , S B , T B ); measuring the difference in electric potential between the two ends (A, B) of each element (30, 40) disposed between said first cable belonging to the distributing network (R A , S A , T A ) and said second cable belonging to the end-user network (R B , S B , T B ); from said at least one measurement, determining whether a device belonging to the end-user network and connected to said meter (51, 61, 71) is causing a noise disturbance or not.