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Mitigating Risk with Insulation Systems

  • September 2021
  • Number of views: 1570
  • Article rating: No rating

Relevant standards including IEC 60085 and IEEE 1 have similar definitions for electrical insulating materials (EIM) and electrical insulation systems (EIS). As with any system, there is an interaction between the materials used, and the insulation system developers take great care to ensure that this interaction does not lead to undesirable outcomes.

Mitigando El Riesgo En Los Sistemas De Aislamiento

  • September 2021
  • Number of views: 1472
  • Article rating: No rating

Diferentes normas relevantes incluyendo la IEC 60085 y la IEEE 1 definen de forma similar los materiales electro aislantes (EIM) y los sistemas de aislamiento eléctrico (EIS). Como en cualquier sistema, existe una interacción entre los materiales usados y los diseñadores de los sistemas de aislamiento cuidan todos los detalles para evitar que esta interacción produzca resultados indeseados.

Best AC Rewind Practices

  • February 2021
  • Number of views: 4471
  • Article rating: 4.0
FREE for Members of EASA
Webinar recording

This webinar recording shares some of the “best practice” rewind methods used by (and learned from) EASA service centers around the world: connection recognition, best insulating materials, wire choices and tips to save time and effort.

Insulation Technology Improvements and the Repair Market

  • July 2019
  • Number of views: 1413
  • Article rating: No rating
Webinar recording

Most modern rotating electric machines operate on the same principles their predecessors have for 100+ years. However, improvements in materials technology over that time have allowed for increasingly greater power density in machine design.

Revisiting insulation resistance temperature correction

  • July 2013
  • Number of views: 1895
  • Article rating: 3.0

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:

  • Why is IR temperature correction necessary?
  • How is IR temperature correction performed?


Revisando la corrección por temperatura de la resistencia de aislamiento

  • July 2013
  • Number of views: 1333
  • Article rating: No rating

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:

  • ¿Por qué es necesario corregir la IR por temperatura? 
  • ¿Cómo se corrige la IR por temperatura?

Rewind Tips for 2300-volt, Random-Wound Motors

  • October 2001
  • Number of views: 1576
  • Article rating: 5.0

When rewinding a motor, the service center is restricted by the original design. Sometimes, we encounter a motor design we wish had never been developed. The random-wound, 2300-volt motor design falls into that category. The great challenge to the service center is in successfully rewinding this design while maintaining profit.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations



EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.


ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

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.



EASA Technical Manual

EASA Technical Manual cover

Revised May 2021
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.