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Resource Library

High-Potential Testing of AC Windings

  • December 2019
  • Number of views: 997
  • Article rating: No rating
Webinar recording

High-potential testing is routinely used to assess the ground insulation of AC stator windings in-process, after completion of a rewind and post-delivery. This webinar covers types of high-potential tests, testing standards, evaluating test results, and more.

Considerations for surface masking and winding treatment processes

  • March 2018
  • Number of views: 856
  • Article rating: No rating
Article

One of the least popular tasks to perform related to winding treatment processes is preparation and cleanup of fits, threaded holes and machined surfaces. Many service centers invest additional time in the preparation stage so as to minimize the cleanup stage. The most common approach to protecting these surfaces during winding treatment is to utilize masking compounds or dry release sprays.

In the last year, EASA’s technical support staff has received a number of inquiries from members seeking replacement recommendations for Famous Lubricants' “Special Masking Compound” which is currently unavailable. It is believed at this time that the manufacturer intends on continuing production at some point in the future though the time frame is not known. This specific problem leads to a more general question: What is a good practice for choosing a product to mask these surfaces?

Consideraciones para enmascarar superficies y procesos de tratamiento de bobinados

  • March 2018
  • Number of views: 673
  • Article rating: No rating
Article

Una de las actividades a realizar menos populares relacionadas con el tratamiento de los bobinados, es la preparación y la limpieza de los ajustes, agujeros roscados y superficies mecanizadas. Muchos centros de servicio invierten tiempo adicional durante la etapa de preparación para minimizar la etapa de limpieza. El enfoque más común para proteger estas superficies durante el tratamiento del bobinado consiste en utilizar compuestos para enmascarar o aerosoles de liberación de película seca. Durante el último año, el departamento de soporte técnico de EASA ha recibido una serie de consultas por parte de los miembros buscando recomendaciones para reemplazar el producto “Special Masking Compound” de Famous Lubricants’ (ver Figura 1) que actualmente no se encuentra disponible. Se cree en estos momentos que el fabricante tiene la intención de continuar con la producción en el futuro, aunque el plazo se desconoce. Este problema específico conlleva a una pregunta más general: ¿Cuál es una buena práctica para escoger un producto para enmascarar estas superficies?

Environmental update for EASA members in the U.S.

  • February 2018
  • Number of views: 380
  • Article rating: No rating
Article

As we enter a new and exciting year of operating EASA businesses, we must remember that almost all service centers in the U.S. with either dip or vacuum pressure impregnation (VPI) tanks will be subject to the SARA Title 3, Tier II, reporting requirements. This requirement is part of the Emergency Planning and Community Right to Know Act (EPCRA). The EPCRA involves notifying the state and local community of any hazardous chemical stored onsite in quantities over 10,000 lbs. A hazard material for the purpose of this regulation is anything hazardous under the Hazard Communication standard. In other words, if it has a Safety Data Sheet and you had more than 10,000 lbs onsite at any time during the previous year (2017), then you are subject to this reporting requirement.  For most EASA centers, this will include the VPI, the dip tank varnish, or, in some cases, both varnishes.

Getting the most from power factor tip-up testing

  • April 2017
  • Number of views: 1998
  • Article rating: 1.0
Article

The power factor tip-up test is commonly used as a quality measurement for new coils and windings manufactured for AC motors and generators rated 6 kV and higher. It can also be useful in the rewind shop to verify the quality of a newly-installed coil system including the effectiveness of VPI processing.

Aprovechando al máximo la prueba de factor de potencia tip-up

  • April 2017
  • Number of views: 1495
  • Article rating: 5.0
Article

 

La prueba de volcado del factor de potencia se usa comúnmente como una medida de calidad para bobinas y devanados nuevos fabricados para motores de CA y generadores con clasificación de 6 kV y más. También puede ser útil en el taller de rebobinado para verificar la calidad de un sistema de bobina recién instalado, incluida la efectividad del procesamiento de VPI.

Keeping it cool: A look at causes of motor overheating

  • March 2015
  • Number of views: 763
  • Article rating: No rating
Article

We know that excessive temperature and moisture are the largest contributors to bearing and winding failures. Understanding the source of the increased temperature will help us to correct the problem and improve the machine’s life expectancy.

Resin curing issues and preventing future problems

Sample tank resin regularly and follow manufacturer’s corrective suggestions

  • March 2012
  • Number of views: 530
  • Article rating: No rating
Article

Have you ever had a curing issue with your DAP monomer (diallyl-phthalate ) solventless resin (hereafter referred to as resin for simplicity)? If you haven't, read on for guidance on preventing issues in the future. If you have, this article provides guidance on correcting the issues as well. As expensive as resin is, all service centers should be diligent about the care of their resin dip tank and VPI (vacuum pressure impregnation) systems. Topics covered include:

  • Resin maintenance
  • Periodic stirring of resin
  • Oven basics
  • Preheating the winding
  • Resin chemistry
  • Aging resin

The importance, benefits of preheating motor windings prior to impregnation

  • May 2002
  • Number of views: 629
  • Article rating: No rating
Article

Did you ever wonder if the preheating instructions from solvent varnish and solventless resin manufacturers were really all that important? The short answer is, yes, they are. Here we'll expand on some of the reasons that preheating is a key step in the winding process.

Training Film 7, Part 2: Manufacturing Form Coils (Insulating Form Coils)

  • June 1984
  • Number of views: 22
  • Article rating: No rating
Video

Teaches how to determine type of connection, number of parallel circuits, turns per coil, wire size, span and groups. Shows step-by-step way to properly record all information.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides a great marketing tool for your service center! Use it to provide end users with information that will help them obtain 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

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EASA Technical Manual

EASA Technical Manual cover

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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ANSI/EASA AR100-2015

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.

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DESCARGAR - ESPAÑOL

EASA AR200

EASA AR200: Guide for the Repair of Power and Distribution Transformers cover

Guide for the Repair of Power and Distribution Transformers
This document establishes guidelines for each step of the repair of power transformers, describing record keeping, tests, analysis, and general guidelines for the repair of power transformers.

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