Analysis of impedance characteristics of MV power distribution line for BPLC

In this paper, an impedance characteristics of a Medium Voltage(MV) power distribution line in the frequency range of 1MHz to 40MHz for Broadband Power Line Communication (BPLC) has been analyzed and verified experimentally. In order to analyze the impedance characteristics of MV BPLC system, the 2-port equivalent model has been used. Especially, the input impedance values of MV power distribution lines have been obtained between 200Ω and 300Ω, which are about a half of the characteristic impedance values of MV power distribution lines. Then the analyzed input impedance has been verified by measuring reflection coefficients at the signal input terminal of a MV power distribution line through the vector network analyzer in the given MV test field. From the experiment, the measured results are very similar to the analyzed results.