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    Volume 42, Issue 6 (November 2014)

    Temperature Index of Electrical Insulations by mTGA

    (Received 9 May 2014; accepted 22 July 2014)

    Published Online: 2014

    CODEN: JTEVAB

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    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 J.
    Senior Engineer, Steam Turbine and Generator Engineering, GE Power & Water, Schenectady, New York

    Kaminski, Christopher A.
    Senior Engineer, Steam Turbine and Generator Engineering, GE Power & Water, Schenectady, New York


    Stock #: JTE20140217

    ISSN:0090-3973

    DOI: 10.1520/JTE20140217

    Author
    Title Temperature Index of Electrical Insulations by mTGA
    Symposium ,
    Committee E37