The relationship between the impulse grounded resistance and the lightning current waveform,the relationship between the soil resistivity,and the length of radial conductor were given.

As a result, the proposed numerical algorithm with fast and effective properties can be successfully applied to parameter estimation of lightning current waveform in different expressions and to data compression in lightning measurement systems; it is valuable for engineering evaluation and lightning research.

The impulse voltage caused by intrusion oflightning wave into low voltage power cable laying down inpower dispatching center building is researched when thefactors, such as different cable wiring schemes, whether thepiezoresistors are installed and the number of piezoresistorgroups, are respectively considered.

A lightning wave invasion to electric cable made sheath protector damaged.

This paper describes the physical process that the lightning wave transmits on the overhead r.

But the invasion of lightning surge may lead its failure due to its low voltage withstand level which may affect the normal service power system.

The effect of maximum protective distance l between the surge arrester and the electrical devices on the device to be protected at ingress of lightning surge to substation is briefly analyzed,focused on procedure of deriving formula for l.