Partial discharge signals will subject to a certain degree of attenuation

when they propagate along the stator winding. This will bring a certain impact on on-line monitoring and fault diagnosis for HV motor stator windings partial discharge

if seriously

may even cause warning system misjudgment. In the light of this problem

a 315 k W/10 kV three-phase induction motor as the research object

this paper studies propagation attenuation laws of simulated PD pulses in the stator windings

and obtains the attenuation characteristics of different frequency simulated PD pulses in the stator windings. In order to verify the authenticity of attenuation laws

this paper on electromagnetic shielding room

using real slot discharge signals as the signal source

to analyze the attenuating situation of slot discharge signals under different voltage

which propagated in a real machine windings. It can be obtained from the experiment

when pulses propagated a winding distance

the maximum discharge capacity of response pulses decays rapidly to excitation pulses of 1/5

or even less

afterwards the decay rate slowed down. The contents of this study provide evidence for the HV motor stator winding partial discharge on-line monitoring and fault location.