>The test setups I have seen for CE testing involve single phase >equipments. Looking for thoughts on EFT tests of high current >three-phase equipment. > >Do I need to run A-B, B-C, C-A, A-GND, B-GND, C-GND, ABC-GND, >AB-GND, BC-GND, CA-GND? > >Are there other combinations which must be addressed? > >Who makes an EFT gen to handle 440 volts wye? > >jgs
James, EFT testing is generally done to eacxh conductor with reference to the ground plane so you only need test each conductor (Neutral, Line phase 1, Line Phase 2, Line Phase 3, Ground) in turn. Most test labs would run each phase (or ground or neutral) separately. You would generally get a CDN (coupling-decoupling network) to connect between the EFT generator and the AC supply. These are available from most of the generator manufacturers with price rising rapidly with the current rating of the CDN. The CDN connects to the high voltage output from the generator. Figure 4 in IEC1000-4-4 (or EN61000-4-4) shows the construction for the CDN. You may be able to make your own if you have an old 3-phase LISN lying around. Mark Mark Briggs [email protected]
