In order to compare the different characteristics of flashover under different types of lightning waveform

four types of oscillating lightning impulse voltage（OLI） waveforms with oscillating frequency of 100

200

300 and 400 kHz were applied on oil-paper samples with parallel electric field. The standard lightning impulse（SLI） voltage was also adopted as the reference waveform. Characteristics of flashover under different types of lightning waveform were compared.The experimental results show that the 10% and 50% flashover voltages under OLI are higher than those under SLI.The voltage-time distributions under OLI are also higher. With the increase of oscillating frequency

the 10% and 50%flashover voltages increase and the voltage-time distribution gradually rises. The OLI has the longer time lag than SLI.The Weibull probability coordinate paper was applied to study the surface flashover probability. The experiment results show that the slope of OLI is larger than that of SLI

besides

with the increase of oscillating frequency

the slope of OLI gradually decreases.