Investigation on the Susceptibility to RFI of High-Voltage Current Sensors

Current sensors inserted in the cables connecting electric drives to power loads are likely exposed to the radio frequency interference (RFI) collected by cables, which behave like unintended antennas. This paper investigates the susceptibility to the RFI of such components referring to the bulk current injection (BCI) test method, which is used at the module level, and to the direct power injection (DPI) test, which applies at the component level. A method to evaluate the RF power level to be applied in the DPI test at the inputs of a current sensor to allow an electronic module comprising that device to pass the BCI test is proposed.