Modeling the Transient Behavior of Surge Protective Devices Connected to the DC Side of Electric Vehicle Charging Stations

This work provides an electromagnetic transient model for low-voltage surge protective devices connected to the dc side of electric vehicle charging stations with a maximum operating voltage of 1000 V. An equivalent circuit model is developed based on standard impulse voltage ($1.2/50\ \mu\mathrm{s}$) and impulse current ($8/20\ \mu\mathrm{s}$ and $10/350\ \mu\mathrm{s}$) experiments. The proposed model reproduces quite accurately the response of the combination type surge protective device under study in terms of sparkover voltage, residual voltage, and energy absorption, as illustrated through ATP-EMTP simulations. The developed simulation model can be an effective tool for surge protection and insulation coordination studies for electric vehicle charging stations.