Radio-frequency common-mode noise propagation model for power-line cable

Abstract

Electromagnetic-interference (EMI) radiation from a

power-line communications (PLC) network has been a major concern

for the widespread use of broadband PLC technology. It is

also well known that the dominant radiation mode of the PLC

network is common mode (CM) by nature. Therefore, for electromagnetic-

compatibility planning purposes, knowledge of the CM

noise propagation path of the power line in the frequency range

of 1 to 30 MHz is essential to provide insight of EMI radiation

emitted by the power line. Based on a two-current-probe measurement

approach, the CM noise propagation model for a three-wire

power-line cable can be derived and represented by an equivalent

two-wire CMtransmission line. The equivalentCMnoise propagation

model allows us to predict the CM noise current on the power

line with reasonable accuracy. The model will serve as a valuable

tool in the future to identify effective ways to suppress EMI radiation

from the PLC network.