Condition assessment of electrical apparatus with EMI diagnostics

This paper describes the theory, development history and application of Electro Magnetic Interference Diagnostics to the condition assessment of high voltage apparatus such as motors, generators, transformers and bus. Data is collected while equipment remains in service. Examples of common problems identified at power facilities, upstream off shore production rigs as well as downstream, plastics, chemical and central utility facilities are provided. How data is collected, analyzed and presented is discussed.