Strategy-making method of overhead line control and undergroundcable retrofitting based on clustering algorithm;

Utilizing computer to protract installation curve of overhead line;

With consideration of the shortage that the tradition discriminant method of overhead lines of rural power grid is complex and hard to programme, a discriminant algorithm of control climate condition of rural power grid based on iterative technology is introduced.

Calculation of lightning withstand level for energy-user overhead transmission line and improving measures;

The formation and classification of lightening overrating voltage and the ways for regular and irregular lightening-proof of the overhead transmission line are introduced.

The control condition of carrying capability of overhead transmission line is introduced, and a deep analysis is given on operation terms of transmission lines and weather parameters survey in decades in Guangdong, and allowable current I0 on transmission line under normal operation for Guangdong Power Grid is established.

Starting with the traits of zero order impedance and the relationship between zero order current and zero order impedance,analyzes the main differences of electric traits of power cables and aerial lines and the disadvantages of applying power cables into the traditional grounded protection.

Analysis of power frequency over-voltage for unloaded lines by using PSCAD/EMTDC

The power frequency overvoltage of unloaded line because of the capacity effect is studied,and the effect of eliminating power frequency overvoltage using shunt reactors is analyzed.

With the aim of becoming one of the feasible black-start plans,the verification of switching overvoltage in unloaded line is one of the important verification.