Journal Published Online: 23 September 2014
Volume 42, Issue 6

Temperature Index of Electrical Insulations by mTGA

CODEN: JTEVAB

Abstract

Temperature index (TI) is a common measure for the temperature classification of electrical insulation materials (EIMs) used in electric machines and apparatus. TI is generally obtained through accelerated life testing lasting >7–8 months at certified labs. This paper deals with a new life-testing method to determine TI using thermogravimetric analysis (TGA), more particularly, modulated TGA (mTGA), The method of estimating precision of the TI is also given. The testing time may be reduced to <15 h per test. The new concept simplifies the life equation for practicability. The new method is not a replacement of conventional life testing, but may be of particular utility for screening new EIMs and evaluating materials with a known TI, after minor changes in composition have been introduced to improve physical properties. It can be a recommended method once it has been verified over a suitable range of EIMs.

Author Information

Xu, James
Steam Turbine and Generator Engineering, GE Power & Water, Schenectady, New York, US
Kaminski, Christopher
Steam Turbine and Generator Engineering, GE Power & Water, Schenectady, New York, US
Pages: 12
Price: $25.00
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Details
Stock #: JTE20140217
ISSN: 0090-3973
DOI: 10.1520/JTE20140217