Impact of fault resistance for fault transient component

The transient component generated by faults of transmission line affects the performance of protection.Distributed parameter model is used to express EHV transmission lines and impact of fault resistance for transient component is analyzed.The relation between transient component and fault resistance is discussed.Theory analysis shows that the fault component is a series of natural frequencies in frequency domain,when grounding fault occurred,the lowest one of natural frequencies does not impact by fault resistance and the attenuation coefficient increase with fault resistance.Simulation is carried out on PSCAD system with 1000kV power system.