Study of Accelerated Thermal Aging Effects on Nomex-Mylar-Nomex and Dacron-Mylar-Nomex Insulating Paper
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 4
Abstract
In this paper, accelerated thermal aging of rotating machines insulating papers was done on two different type of insulating papers such as Nomex-Mylar- Nomex (NMN) and Dacron-Mylar-Dacron(DMD). These insulating materials wrapped on copper conductor with single layer and placed in an oven are thermally aged at 90oC, 130oC and 170oC with 300hrs duration of each sample. Then, breakdown voltage test is performed at each temperature for fresh and aged samples to determine their dielectric strength. Further, correlation analysis between breakdown voltage and different applied temperatures is performed for these samples. By using Scanning Electron Microscopy (SEM) how the bonds in fresh and aged sample is seen. Popular Arrhenius plot is drawn by short term test data on breakdown voltage for an extrapolation to long term performance of various types of insulating paper used in rotating machines. From these remaining lifetime of NMN and DMD insulation is predicted.
Authors and Affiliations
Natla Sudheer Reddy, Raj Kumar Jarial, Chilaka Ranga
Keywords
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