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Agreed. Monitoring at the terminals can’t tell you the same thing as tva probe scanning the stator bore.I already have two PD Tech MICAMAXX & one HVPD Longshot PD Analyzers. However; I am not of any instrument (including these, Iris, Doble, etc.) that can pinpoint the PD to a specific stator bar. If you are aware of such instruments (other than TVA & Lemke), please let me know. I would truly appreciate it.
... and also surge test once winding is reversed. Again the purpose is to prevent "infant mortality" failures during operation from any weak coils that may previously have been hiding/protected on the neutral end of the winding.you wouldn't want to do this procedure unless you also do a hi-pot to check for that condition to find it during test rather than operation.