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Partial discharge detection and source location in production and in-service high-voltage transformers using acoustic emission

Acoustic emission (AE) monitoring techniques have been applied successfully to high voltage transformers, to aid in the detection and source location of the origin of partial discharge (PD) events. Three dimensional source location techniques have been applied in the manufacturing environment evaluating suspect transformers based on capacitance measurements. Good correlation levels have been established with the capacitance microvolt measurement and AE activity. Accurate source location has been confirmed by visual examination. Field substation transformers have also been evaluated using the same technique. Suspect transformers based on high combustible gas levels were monitored. Correlation has been established between high combustible gas levels and AE activity. Accurate source location has been confirmed by visual examination. Test procedures and acceptance criteria are being evaluated for new and in- service transformers. Both of the above case studies are presented in this paper.