Off-Line Rotor and Stator Winding Tests

This chapter describes the main tests that are commercially available for assessing the condition of rotor and stator windings. It describes the purpose of each test, together with the types of machines and/or windings it is useful for. The chapter describes the theory of the test and compares with other similar tests. Practical information is given on how to apply the test, including the state the winding must be in to do the test and the normal time it takes to do the test. A practical guide is given on interpreting the results which reflects the experience of test users. To aid in test selection, a summary of the most common off-line tests for stator and rotor windings, respectively. Many of the tests are described in IEEE and IEC standards. In addition IEEE Standards 56 and 62.2 give overviews of the tests used for rotating machine windings.