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How to schedule

To schedule private education for your group, contact:

Dale Shuter, CMP
Meetings & Expositions Manager
+1 314 993 2220, ext. 3335
dshuter@easa.com

1 hour of training

$300 for EASA Chapters/Regions
$400 for member companies
$800 for non-members

How a webinar works

All EASA private webinars are live events in which the audio and video are streamed to your computer over the Internet. Prior to the program, you will receive a web link to join the meeting. 

The presentation portion of the webinar will last about 45 minutes, followed by about 15 minutes of questions and answers.

Requirements

  • Internet connection
  • Computer with audio input (microphone) and audio output (speakers) appropriate for your size group
  • TV or projector/screen

Zoom logo

The Zoom webinar service EASA uses will ask to install a small plugin. Your computer must be configured to allow this in order to have full functionality. Please check with your IT department or company's security policy prior to scheduling a private webinar.

Private Webinars

EASA's private webinars are an inexpensive way to bring an EASA engineer into your service center, place of business or group meeting without incurring travel expenses or lost production time.

SearchClear

Article

Form coil rewind tips for motors 6 kV and above

  • February 2006
  • Number of views: 7545
  • Article rating:

Chuck Yung
EASA Technical Support Specialist 

When rewinding motors rated 6 kV and above, there are certain steps beyond the normal rewind procedures used for 2.3 kV/4 kV machines. Whether a machine is to be VPI processed makes a difference in how the winding should be treated. 

Aside from the obvious issues of insulation and higher voltages, there is also the possibility of partial discharge (PD), which brings its own unique set of problems. Air is an electrical insulator, albeit one of inconsistent quality. Increased humidity lowers the dielectric breakdown voltage of air, so an air gap that might be adequate under dry conditions may prove inadequate when the humidity is high (Table 1). Even though a form coil is fully taped, sealed and processed, the presence of air in voids within the coils, or between the coil and ground (i.e., in the slot) can cause problems with PD. 

Available Downloads



ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 3: Rewinding

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 7: Stators

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 7: Stators

Tags: Motor rewind/repair Form wound
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