LOW FREQUENCY MAGNETIC FIELDS NEAR CHARGING STATIONS FOR ELECTRIC VEHICLES

Abstract

Charging stations (CHS) for electric vehicles (EV) are considered as sources of local magnetic fields (MF). The MF created by the CHS depends mainly on the actual charging power and topology of the electrical components inside the CHS. MF are in technical practice represented by the effective value of the magnetic flux density BRMS. However, the complex view has to consider the resulting MF vector, its components and the corresponding frequency values of the components at the measurement point and also their corresponding time development. The paper presents measurements of MF near the CHS that were performed with the VEMA-04 series magnetometer and 38 kW power drawn from the CHS. The parameters of the magnetic fields were evaluated in both the time and the frequency domains. The aim of this analysis is to point out that evaluating only simple effective value BRMS of MF is not sufficient.