Propagation of the PLC signal current along a power line is analyzed in two independent modes. From this analysis, a set of fundamental equations and an equivalent circuit model are derived for the common- and differential-mode currents. It is found that the common-mode disturbance current is generated by a PLT modem itself as well as the differential-to-common-mode conversion caused by not only a connected load but also a PLC modem. Multiple reflections at both the load and the modem are found to make an important contribution in generating the common-mode current.%電力線を伝搬するPLC信号の平衡・不平衡モードの発生と伝搬について検討し，これに関する基本表を導出し，併せて，等価回路を導いた．その結果，電力線の負荷及びPLCモデムで，各モード間の相互変換と多重反射が発生することが分かった．さらに，電力線端で測定されるLCLの計算法を導出した．また，不平衡電流を規制すれば，PLCの信号電圧および信号電流を制限できることが分かった．
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