Insulation Diagnosis for Rotating Machine Insulation

In recent years it is strongly required to have high reliability in rotating machines. On the stator windings, many kinds of non-destructive tests can be used to check their deterioration or to estimate their life. This section describes the status of insulation diagnosis for rotating machine insulation in Japan. These are (1) deterioration judgement criteria, (2) diagnostic methods under development and (3) monitoring methods.