With the continuous growth of electricity demand

the scale of the distribution grid is constantly expanding and the structure is becoming more and more complex. Different neutral point grounding methods are widely used in the distribution grid

and the line protection performance is directly related to the safe and stable operation of the power grid. It is urgent to study the impact of grounding methods on it. This paper focuses on the research of the impact of the neutral point grounding method of the distribution grid on the line protection performance. The differences in fault characteristics under different neutral point grounding methods are analyzed

and their mechanism on the accuracy

reliability and other performance indicators of line protection action is discussed. Through the combination of theoretical analysis and actual cases

the intrinsic connection between the grounding method and the protection performance is revealed

which provides an important reference basis for the distribution grid to reasonably select the neutral point grounding method and optimize the line protection scheme.