Based on the actual work,the noteworthy problems in invading wave protection of substation are discussed in brief.

The analysis of lightning intruding wave overvoltage along 330kV transmission line in 750kV Yinchuandong substation;

In this paper,the overvohage of 750 kV AIS substation caused hy lightning intruding wave is investigated,and the resulting overvoltage magnitudes at several basic points in the substation(including input line,bus bar and power transformer)are computed.

Two part contents are considered in this paper: 1) Study on lightning performance of ultra high voltage (UHV) transmission line; 2) Study on lightning invaded wave over-voltage of UHV substation.

The simulation of protection of lightning intruding surge is the important content in 500kV substation,which is researched in-depth by many electric power experiment research institutes and power design institutes.

Effect of 500 kV substation operation mode and phase angle of applied voltage on lightning incoming surge;

In digital simulation of lightning incoming surge protection for substation, the simulation methods of towcr model and insulator strings flashovcr model, the scloction of light-ning strike spot and so on give the great influcnces on the magnitute and thc wave shape of the lightning surges coming into the substation.

There are two source of lightning stroke damage in a substation: directlightning stroke and lightning incoming surge.

In the lightning intensified area at South China, the accidents of the internal insulation breakdown and explosion of temporary opening SF6 circuit breakers or current transformers caused by lightning intruding waves occurred many times in recent years.