Common-mode Current Converted from PLC Signal in Three-phase Distribution Network with Earth Leakage Circuit Breaker

It is known that power line communication (PLC) works across different phases in a three-wire three-phase distribution system; even through the pairs of lines for each phase are not physically connected. This research focuses on the distribution boards in the power distribution network and evaluates the effect on PLC of an earth leakage circuit breaker(ELCB) attached to the boards. The results of an evaluation of the common-mode current with and without the ELCB showed that it increased with the ELCB. Resonance in our setup occured at 20 MHz. A simulation analysis showed that the capacitor connecting the two wires at both ends of the ELCB contributed to the resonance.