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The rule "insulation resistance halving for a 10 degC increase in temperature for rotating machine insulation" has been widely used in the industry. The rule was established based on testing of some insulation systems during the late 1950s. IEEE standard 43-2000 also provides a chart of the insulation resistance temperature coefficient versus temperature for correction of insulation resistance...
This paper presents our recent experience in quality evaluation of stator coils and bars during thermal cycling (TC) tests using several diagnostic tools. Diagnostic tests, such as tap tests, dissipation factor tests, partial discharge tests, and capacitance measurements were conducted to evaluate the insulation condition during and after thermal cycling testing. Thermal cycling tests accompanied...
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