Overshoot level studies of PD Exposure in High Voltage Motor Isolation
Artikel i vetenskaplig tidskrift, 2025
within motor windings. To understand these phenomena better, the aim of the presented work is to demonstrate the influence of both these factors on the imposed by them partial discharge (PD) activity. A test technique is presented that allows creating controllable overshoots in bipolar PWM
voltage waveforms of different rise times and experimentally exposing to them pigtail test objects that resemble the insulation of high voltage motor windings. It is demonstrated that the mutual interrelation between the DC peak voltage level and the oscillation magnitude influences the resulting stress considerably. The partial discharge extinction voltage level (PDEV) is particularly affected, and a notably increased stress is introduced on the insulation due to the presence of overshoots. It is thus implied that, when designing and performing accelerated aging tests, the possibility of appearing in them overshot stresses should be avoided, as their presence can yield erroneous conclusions in the evaluation of insulation material performance.
pigtail test object
partial discharge (PD)
insulation system
machine winding
Index Terms—Accelerated aging
pulse width modulation (PWM)
Författare
Thomas Hammarström
Chalmers, Elektroteknik, Elkraftteknik
IEEE Transactions on Dielectrics and Electrical Insulation
1070-9878 (ISSN) 15584135 (eISSN)
Vol. 32 2 1172-1180Drivkrafter
Hållbar utveckling
Styrkeområden
Transport
Produktion
Energi
Fundament
Grundläggande vetenskaper
Ämneskategorier (SSIF 2011)
Farkostteknik
Annan elektroteknik och elektronik
Den kondenserade materiens fysik
DOI
10.1109/TDEI.2024.3428514