Analysis the Effect of Impulse Type Earth on the Power System without Neutral Point Earthed

There are three earth type in Low voltage distribution system .They all have advantages ,but have disadvantages .How to comprehensive utilize their advantages ,improve the reliability and continuity. There introduced a way of selective abscission of the single phase earth of the three-phase three-wire IT system as impulse earth type. Confirming the feasibility of the way through analyzing and the simulation.