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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.

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Article

Surge testing anomalies: Helpful tips to prevent problems

  • April 2007
  • Number of views: 4007
  • Article rating:

Cyndi Nyberg
Former EASA Technical Support Specialist

The surge test is used to detect winding faults in AC and DC windings. If there is a turn-to-turn short, the surge test will show that. The surge test is an important step in the initial inspection of a machine, as well as a final test to ensure a proper rewind. 

For this article, we will only focus on three-phase windings. The surge test is typically run by applying a high voltage across each of two phases of a three-phase motor. The decaying resonance patterns of the two phases are superimposed upon one another on an oscilloscope. If the two phases are identical, as they should be, then the patterns will be identical. A perfect match will yield only one apparent pattern (Figure 1a) while a variance or difference, as shown in Figure 1b, represents an apparent problem. Testing continues until all phases have been compared to one another – 1 to 2, 2 to 3 and 3 to 1. 

Available Downloads



ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100
  • Section 4: Testing

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 7: Electrical Testing

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 12: Test & Inspection Procedures

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 12: Test & Inspection Procedures

How To Wind Three-Phase Stators interactive training software
  • Lesson 12: Testing Untreated & Treated Windings

Tags: Motor testing Surge testing
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