Arc Fault Model for Low-Voltage AC Systems

A lot of three-phase arc fault experiments show that arc voltages of three-phase arc fault in low-voltage ac systems vary stochastically. These arc voltages cannot be expressed exactly by formula. This paper introduces a three-phase arc fault model for low-voltage ac systems derived by probability method according to the characteristics of three-phase fault arcs. This model can be used to calculate minimum three-phase arcing fault current for setting the relay.