Testing method of transient earth voltage( TEV) is introduced and the principle of TEV is analyzed by electromagnetic method in the paper. Then the relationship between TEV result and rising time of PD
PD pulse amplitude
detection distance and humidity is researched through simulation. The simulation results show that the TEV amplitude is proportional to the PD pulse amplitude and humidity
increases as rising time of PD decreases
and decreases as the distance between detection point and PD source increase.