Chuck Yung
EASA Senior Technical Support Specialist

Although the rotating equipment repair industry has been around for over a century, technology continues to introduce new test instruments and procedures. Some of these are good: surge test, growler, core loss test; some are bad: core testing a rotor at 60 times its operating frequency, or performing a Hipot at several times the prescribed value; and some are just plain ugly.

This paper will help you to sort out which are which, and help educate your customers as to the reasons why. Standards organizations (IEEE, ANSI, IEC) have developed specific tests, with much scientific thought as to how stringent a test should be. ANSI/EASA AR100: Recommended Practice for the Repair of Rotating Electrical Apparatus consistently references the relevant standard(s) for each test.

This paper, presented at the 2013 EASA Convention, summarizes the accepted and other electrical tests required by motor and generator end users. It covers:

• Various standards (IEEE, IEC, NEMA, ANSI and API) that describe and legitimize most of the tests used by our industry
• Other tests, not supported by any recognized standards, that end users request repairers to perform
• An outline of these tests, with supporting standards, which should be useful when discussing testing requirements with end users

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