The Analysis of Low-Voltage DC Arc behavior on Three Interrupting Phases Based on AC Black-box Arc model

Among many low voltage power electrical devices, Low-voltage (LV) dc circuit breaker (DCCB) is one of the most essential components and is widely used to protect the overall LV dc distribution system. Therefore, many research institutes and manufacturers have been concentrating a lot of research and interest in LV DCCB in recent years. LV dc arc simulation modeling technique using computational methods is being studied. However, dc arc modeling technique using only finite element method is studied among various modeling methods, and there are no existing researches of dynamic arc-circuit interaction analysis using a black-box model. In this paper, LV dc arc is modeled by using the proposed black-box model as the ac arc modeling technique. The existing LV DCCB has air arc characteristics according to the interrupting topology, and the corresponding LV dc arc interrupting phases can be divided into arc commutation, arc motion, and arc splitting. Arc modeling was performed on three interrupting phases, based on the typical waveform of a LV dc arc and actual experimental data. The black-box model uses the schwarz model, which is known to be best suited for representing the small current and large current regions of the arc. As a result, the applicability of the dc arc was evaluated using the existing ac black-box model, and the behavior of the dc arc for each interrupting phase was described.