Degradation of mechanical properties of class-H winding insulation

Fernando, W, Romanazzi, P and McCulloch, M 2018, 'Degradation of mechanical properties of class-H winding insulation', in Proceedings of the 2017 IEEE International Electric Machines & Drives Conference (IEMDC 2017), Miami, Florida, United States, 21-24 May 2017, pp. 2951-2957.


Document type: Conference Paper
Collection: Conference Papers

Title Degradation of mechanical properties of class-H winding insulation
Author(s) Fernando, W
Romanazzi, P
McCulloch, M
Year 2018
Conference name IEMDC 2017
Conference location Miami, Florida, United States
Conference dates 21-24 May 2017
Proceedings title Proceedings of the 2017 IEEE International Electric Machines & Drives Conference (IEMDC 2017)
Publisher IEEE
Place of publication United States
Start page 2951
End page 2957
Total pages 7
Abstract Thermal ageing is one of the key factors that result in insulation degradation leading to lower dielectric strength and thereafter occurrence of partial discharge in high voltage machines. However, in low voltage high current machines, the occurrence of partial discharge is minimal and degradation of dielectric strength alone will not cause the breakdown of the insulation. This paper hypothesizes that the breakdown of insulation in low voltage/high current machines occur as a result of insulation cracking among other factors. In this paper, it is shown that thermal degradation leads to degradation of mechanical properties of Polyamide-imide insulation, particularly reduction of the ultimate tensile strength and leads to enhanced brittleness. It follows that once a crack in the insulation is formed, the breakdown strength at the point of cracking will be lower. Multiple such cracks may lead to the formation of a breakdown path thereafter leading to aggravated heating and further accelerated deterioration of the insulation. In this paper, the methodology for testing the mechanical properties of insulation material is presented. A model to account for the variation of such properties due to thermal degradation is developed.
Subjects Industrial Electronics
Keyword(s) brittleness
cracks
electric strength
machine insulation
machine windings
organic insulating materials
partial discharges
reliability
DOI - identifier 10.1109/IEMDC.2017.8002411
Copyright notice © 2017 IEEE
ISBN 9781509042821
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