Abstract
Partial discharge (PD) under a sequence of high-frequency pulse is one of the key factors which lead to premature failure of turn insulation of inverter-fed motors. Aging experiments for turn insulation samples under bipolar continuous square impulse voltage were done. The number and mean quantity of PDs under impulse voltage has been studied. By means of scanning electron microscope (SEM), the microcosmic morphology of surface of turn insulation was analyzed. The results reveal that the relationship of PD parameters (PD number and mean PD quantity) and aging time is complicated. The damage to polyimide nano-composite film structure is concentrated on the degradation of polymer matrix in the presence of PDs. The residual nano-fillers remained on the surface and formed a screen layer to resist the further damage of PDs. It is the symbol of faults expanding rapidly when the floccules and voids formed on the surface, which means insulation failure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
