scope:

This document sets out guidelines for the procedures to be followed when carrying out vibration diagnostics of 2‑ and 4‑pole electrical generators of cylindrical pole design with an output over 50 MVA. Salient pole design generators are outside of the scope of this standard.

This document provides a practical step-by-step vibration-based approach to fault diagnosis. The requirements of this standard should be considered together with those in ISO 13373-4.

The approach described in this document is based on established good practice, put together by experienced users, although it is acknowledged that other approaches can be used. Recommended actions for a particular diagnosis depend on individual circumstances, the degree of confidence in the fault diagnosis (e.g. has the same diagnosis been made correctly before for this machine), the experience of the practitioner, the fault type and severity as well as on safety and commercial considerations. It is neither possible nor the aim of this document to recommend actions for all circumstances.

Although some electrical generators are equipped with stator end-winding and core vibration monitoring systems, evaluation of the measurement results from these systems is design specific and outside of the scope of this standard.