A discharge locating probe for rotating machines

The basic principles of an improved Tennessee Valley Authority (TVA) probe known as the discharge locating (DL) probe are presented. The principal features of the new device are very-high-frequency detection using a capacitive sensor and microprocessor-based signal processing. These features are intended to make the probe easier to use and less ambiguous in the interpretation of results. The coupling technique used permits significantly improved spatial resolution of the discharge source and immunity to radiated electrical interference. Details of the signal processing electronics and field experience are described.<>