Abstract
Condition diagnostics of complex systems, such as high voltage rotating machines was never a simple task. Design requirements, use of different materials and demanding operating conditions require multiple off-line tests and on-line monitors to get information on machine condition. However, some tests just provide simple measurement results, without high diagnostic value. The application of different off-line test techniques for diagnostic of stator and rotor insulation and stator core and on-line monitoring tools will be described in this paper.