Fault line determination method and related device

The embodiment of the invention discloses a fault line determination method and a related device, and the method comprises the steps: carrying out the grounding current compensation of an arc suppression coil in a power distribution system after the single-phase grounding of the power distribution system, adjusting the inductance value of the coil, calculating the zero-sequence impedance variable quantity of each line in the power distribution system before and after the adjustment of the inductance value of the coil, and determining the fault line according to the zero-sequence impedance variable quantity. And determining the line corresponding to the zero-sequence impedance variable quantity not in the threshold range as a fault line. The zero-sequence impedance variable quantity of the distribution line is obtained by adjusting the loop inductance of the arc suppression coil, and the fault line is judged according to whether the zero-sequence impedance variable quantity is within the threshold range, so th