Composite Voltage And Current Arc Suppression Method Based on Zero-Sequence Voltage Threshold

To ensure the reliability of distribution network under single-line-to-ground (SLG) fault, the active voltage arc suppression (AVAS) method is usually adopted to suppress the arcs. However, its performance is unfavorable as the line impedance is practically not neglectable, especially when the low-resistance SLG fault occurs. For improvement, the active current arc suppression (ACAS) method is used as a supplement to effectively eliminate this shortcoming. Therefore, this paper proposes a composite arc suppression method, which combines the AVAS and ACAS method to suppress arc. Firstly, the limitation of AVAS method is analyzed. It is found that the residual current after AVAS can be presented by post-fault zero-sequence voltage. Then, a zero-sequence voltage threshold is set to distinguish which type of method should be adopted. When the zero-sequence voltage less than the voltage threshold, the AVAS method is adopted. When the zero-sequence voltage is larger than the voltage threshold, the ACAS method is used. The simulation results show that the proposed method has good arc suppression performance under different fault locations.