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Due to the large amount of branches and high grounding resistance of the distribution network, the earth fault location has not been solved effectively. A live location method is proposed for the single-phase-to-earth fault section in the neutral point resonant grounded system. By this method, the compensation current of arc-suppression coil is adjusted after the metallic earth fault occurs. And the fault section can be confirmed by the variation of zero-sequence current measured by FTU equipped in the lines, for the zero-sequence current in the non-fault path is proportional to the zero-sequence voltage. When the single-phase-to-earth fault via resistance occurs, zero-sequence voltage changes after the arc-suppression coil is adjusted. The method is also effective as long as the zero-sequence current is converted by zero-sequence voltage. The site experiments have been carried out to prove that the method is feasible.