SYMPOSIA PAPER Published: 01 January 1986

In-Service Inspection Test and Evaluation Techniques for Large Generator Rotors


There is much interest on the part of utilities to pursue avenues for upgrading and for the life extension of electrical generating equipment. As an integral part of such an evaluation, the current condition of the generator rotor must be assessed fully to determine if the rotor can be expected to perform reliably for many additional years. A comprehensive nondestructive testing (NDT) and evaluation program has been developed by General Electric Co. to assess the condition of in-service generator rotors, to make predictions of remaining life, to set reasonable reinspection intervals, and, most importantly, to identify rotors that have a high probability of failure and to recommend that they be replaced or otherwise upgraded to minimize the chances of failure.

This paper will describe the inspection methods and analytical techniques that are used in the evaluation of in-service generator rotors and will provide a summary of recommendations that have been made to date.

Author Information

Bellows, RH
Generator Mechanical Engineering, General Electric Co., Schenectady, NY
Zawoysky, RJ
Generator Availability Engineering, General Electric Co., Schenectady, NY
Walker, DN
Generator Mechanical Engineering, General Electric Co., Schenectady, NY
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Developed by Committee: A01
Pages: 219–234
DOI: 10.1520/STP17361S
ISBN-EB: 978-0-8031-4970-0
ISBN-13: 978-0-8031-0465-5