Procedures for EM reduction in power line communication

Abstract EN

The use of the electrical distribution network for rapid communication purposes is referred as power line communication (PLC), where frequency range from 148.5 kHz up to 30 MHz is considered.

EMC-Problems make the realization of the PLC-technology difficult with a high transmission bandwidth.

Therefore, various measurements were carried out in order to determine the amount of the electromagnetic field radiated from PLC systems.

The results showed a critical level of the radiation compared with the limits in the corresponding EMC-Norms, that is unacceptable and need a treatment.

This paper deals with the possibility to decrease the radiation level in the PLCsystems in the event of simultaneously hybrid feeding of both symmetrical and asymmetrical signals.

Therefore real measurements of the radiated magnetic field for the suggested hybrid feeding were carried out and their behavior was analyzed.

The evaluation of the results shows that the radiation can be minimized using the hybrid feeding under specific condition and for definite network topology compared with the radiation for the conventional symmetrical feeding.