For evaluating the partial discharge extent of generator

as far as the two dimensional phase resolved plots were concerned

a new type of plot

namely Sk-Ku plot

was constructed.Furthermore

the Sk-Ku plot was put into the cross analysis of partial discharge detected from two practical generators.The results analysis demonstrate that

Sk-Ku plot can effectively reflect the partial discharge extent and partial discharge derived from different generators can be compared to some extent.Sk-Ku plots of discharge magnitude and count take on the character of conic

what is more

with the increase of partial discharge

the Sk-Ku plots show the trend of shifting from 1

2 quadrants to 3

4 quadrants.In addition

the distribution range of the data decreases significantly.