In order to analyze several current representative calculation models for analyzing the performance of lightning conductor shielding of power transmission line in projects,this paper briefly introduces the whitehead s electrogeometric model,the Eriksson s Improved electrogeometric model and the Rizk s leader propagation model.

There is greater influence of HV overhead lightning conductor on measurement results of grounding impedance for grounding network.

The LWLs of 35kV lines with and without lightning shield lines,in which various installation ways of MOAs used as line surge arresters are adopted,are compared;the influences of impulse grounding resistances of towers and the locations where the shielding failures occur on LWLs are analyzed.

Design on the lightning protection coverage of the lightning shield conductor for UHV transmission line;

And we think that regular lightning shield conductor should be earthed differently or be raised to reduce the lightning probability of OPGW.

The common protection measures against lightning are described including setting up overhead ground wire,decreasing the grounding resistance of tower,increasing coupling ground wire and improving insulation level,which lays a foundation for the deeper research on lightning withstand level of transmission line.