NDLI: Application of dynamic mechanical analysis to endurance testing of generator stator bars

Content Provider	IEEE Xplore Digital Library
Author	Braun, J.M. Stone, G.C. Sedding, H.G.
Copyright Year	1992
Description	Author affiliation: Ontario Hydro, Toronto, Ont., Canada (Braun, J.M.; Stone, G.C.; Sedding, H.G.)
Abstract	The thermal cycling test for generator coils and bars combines a modest increase in temperature cycling rates and cycle temperatures compared to normal operation. This test is performed on full size stator bars and coils and provides valuable data on the ability of the groundwall insulation to resist delamination and remain well bonded to the copper stack. To gain insight into the behavior of the resin component of the insulation system, dynamic mechanical analysis is proposed as a tool to aid in the development of thermally stable insulation systems for continuous high temperature operation and to support current efforts in determining the optimum parameters for thermal cycling tests. Flexural modulus and loss tangent measurements obtained by dynamic mechanical analysis represent a powerful and convenient way to ascertain mechanical properties and their evolution with temperature using microspecimens. Excellent correlation was demonstrated with flexural strength for homogeneous materials, over a broad temperature range.<>
Starting Page	469
Ending Page	472
File Size	435997
Page Count	4
File Format	PDF
ISBN	078030649X
ISSN	1089084X
DOI	10.1109/ELINSL.1992.246956
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-06-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Coils Insulation testing Performance evaluation Stator bars Resists Delamination Bonding Copper Resins
Content Type	Text
Resource Type	Article

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