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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Insulation resistance (IR) testing is performed on rotating machines for several reasons including evaluation of condition, suitability for service and suitability for additional testing. IEEE Std 43-2000 provides the industry recommended practice. It is well established that there is an inverse exponential relationship between IR and winding temperature. For this reason, minimum acceptable values of IR after one minute are specified at a baseline temperature of 40°C to which test values are corrected for evaluation and/or comparison with previous measurements.
When using IR data for trending, industry recommended practice is that subsequent tests be performed when the winding temperature is near the same temperature as the previous test to minimize correction inaccuracies.
Topics discussed include:
La prueba de resistencia de aislamiento (IR), es realizada en las máquinas eléctricas rotativas por varias razones, incluyendo la evaluación de la condición del aislamiento, verificar la aptitud para su puesta en servicio y determinar si es conveniente someter los bobinados a pruebas adicionales. La norma IEEE Std 43-2000 proporciona la práctica recomendada para la industria.
Está bien establecido que existe una relación exponencial inversa entre la IR y la temperatura del bobinado. Por esta razón, los valores mínimos de la IR al minuto, están especificados a la temperatura base de 40ºC. Los valores de IR se corrigen a esta temperatura, para poder evaluarlos y/o compararlos, con mediciones de IR previamente realizadas.
Cuando hacen análisis de tendencias de las resistencias de aislamiento, la práctica industrial recomienda que las pruebas subsecuentes sean efectuadas cuando la temperatura de los devanados se encuentre cerca de la misma temperatura a la cual se realizó la prueba anterior para así minimizar las imprecisiones debidas a la corrección. Los temas tratados incluyen:
This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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