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A new method for conducted EMI measurements on three phase systems

The paper describes a new three phase measurement technique for conducted electromagnetic interference (EMI) measurements with respect to the measurement procedure prescribed from the (CISPR 16) Standard Rules. This technique allows measurement of the common mode and differential mode components of voltage and current. The measurement set-up is composed of appropriately selected voltage and current probes and hybrid junctions. Although this technique has been conceived to best monitor the behavior of the conducted interference it can be also adapted in order to design an alternative and improved measurement set-up for the (CISPR 16) Standard Rules. A complete theoretical and experimental study, performed on a three phase switched-mode power supply, is accomplished showing the suitability of this new measurement technique.