Bounds for conducted emissions in three-conductor systems with long feeders

Estimates are derived for the effects that electrically-long power cords play on conducted emissions (CE) in three-conductor systems. In particular, asymptotic predictions - in the form of upper and lower bounds - are obtained for CE levels measured at the ports of the line-impedance stabilization network. Throughout the analysis, a distributed-parameter prediction model is adopted for the power cord, a Thevenin equivalent representation is used for the electromagnetic interference (EMI) source, and modal decomposition of the circuit quantities is exploited. The impact of electrically-long power cords on EMI filter effectiveness is investigated by embedding basic filtering schemes in the proposed prediction model.