Research on Lightning Fault Location of 110kV Overhead Transmission Lines
With the vigorous development of power grid construction,people's requirements for power supply relia-bility are also increasing.As one of the important factors affecting the safe operation of the system,lightning strikes have a significant impact on production and life.Therefore,aiming at the deficiency of traditional two-terminal meth-od in lightning strike fault location,this paper proposes a new lightning strike fault location method for overhead transmission lines based on lightning strike fault characteristics.Firstly,the fault traveling wave current,polarity and other relevant information obtained by the detection device at the detection point are used to determine the origin of the refraction wave and the range of lightning strike that may be affected.Secondly,according to the obtained infor-mation,the wavelet transform principle is used to accurately determine the position of the wave crest.Finally,the proper formula of lightning strike fault range is selected to accurately locate the lightning strike fault point.Simulation results show that the success rate of lightning strike fault location is greater than 99.7%.The suc-cess rate of fault location is improved effectively by the proposed method,which is of great significance to reduce the time of fault location and the rapid recovery of power supply.