Simulation Analysis Of Opening Operation Overvoltage Of 750kV No-Load Line Under Electric Arc Reignition

With the development of the society,the construction of power grid has reached a higher level in the period.In the twenty-first century,China has owned the advanced power grid technology.The intelligent power grid is urgent due to the fierce competition in the modern life.Meanwhile,with the construction of voltage grade grid,it is more essential for the development of overvoltage research due to the variety type of power system transient overvoltage.No-load line overvoltage has important effect on the insulation and protection of electrical equipment in the power grid.Because of the high amplitude,steep waveform and short duration,the possible of flashover and breakdown of insulators would increase and the fundamental reason is circuit breaker reignition.Thus,it is of great significance for the research of no-load line overvoltage in case of arcing.This paper use the graphical pre-processing program ATPdraw to construct four different simulation models based on 750kV no-load circuit,including:the breaking overvoltage of the 750 kV no-load.circuit simulation model,breaking overvoltage of the parallel reactor simulation model in the same case,the breaking overvoltage of the 750 kV no-load circuit under the arc reignition simulation model and breaking overvoltage of the parallel reactor under the arc reignition simulation model in the same case.The research method is as follows,first,simulation research is to get the breaking overvoltage situation when the arc does not reignition.Then,setting the different reactor values to study whether the parallel reactor has an inhibition effect on breaking overvoltage.Second,the simulation model of arc reignition is simulated.Under other conditions are same,simulation research no-load brake overvoltage by setting different number of are reigniles,which obtains number of the arc reignition worst case,and then the number of times of arc reignition is set to the worst case.In this case,simulation research the influence of no-load brake overvoltage by connecting different reactors in parallel.Finally,By comparing the obtained data,the paper annlysis the what arc reignition has a specific influence on breaking overvoltage and the parallel reactor has an specific inhibition effect on breaking overvoltage.