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PD monitoring

PD monitoring is generally present in all stator windings on the rotating machines and is one of the common failure problems. There is no red line on the actual limit of a new machine that was set by IEC (standard says this should be decided between the end user and manufacturer) however rule of the thumb is – if PD doubles in 6 months is a clear sign that the machine is failing.
Measuring PD offline has no big significance on Generators (no mechanical forces which tend to move the components and no thermal expansion).