By analyzing the zero-sequence full current for single-phase grounding fault in isolated neutral distribution network, a new approach to determine the faulty transmission line is obtained.

With the increasing capacity of distribution network and new large-scale use of electrical equipment, a suitable neutral grounding more and more important for the safe operation of the power grid.

The 10 kV network neutral grounding by nonlinear resistance as a new neutral grounding mode for power system is brought forward.