EMC’04/Sendai Electromagnetic field near power line for a power line communication system

LCL and LCTL frequency characteristics for the balanced pair cable of power line communication system were measured for the several grounding conditions such as no, input side and output side groundings. In consequence, it is clear that the input side grounding for LCL became the worst, but the output side grounding for LCTL became the worst, and the tendency of the LCTL frequency characteristics is different from that of LCL. The Leaked E-field characteristics from the balanced pair cable were measured and calculated for the several grounding conditions, and it is revealed that the measurement and calculation results for the maximum additional amount of the leaked E-field compared with no grounding is also about 20dB by the input side grounding. In addition, it turns out that the leaked E-field becomes also large as LCTL gets worse, and the relation between LCTL and the leaked E-field depends on the grounding conditions such as no, input side and output side groundings. Key words; Power line communication, LCL, leaked electromagnetic field, grounding and method of moment