Marked advantages of damping resistor-both falling the probability and decreasing amplitude of overvoltage were pointed out by simulating and analyzing the circuit describing single phase arcing grounding overvoltage.

On the other hand, the nonlinear resistor and the arc suppression coil in series can overcome the inherent shortcoming of the linear damping resistor shunt short-circuit apparatus in the automatic tracing are suppression equipment, improve the operating condition of the arc suppression coil, and enhance the security of pow.

The effective methods are proposed by connecting parallel damping resistance on primary side of the coupling transformer or/and adopting pre-triggering.

Meanwhile, the voltage rise caused by resonance in course of adjusting is controlled by series damping resistance.

In order to clarify the influence of the damping resistance on system stability,filtering effect and power loss,the transfer function in S and Z domain according to the model of the three-phase voltage grid converter was acquired.