A Diagnosis Approach for Partial Discharge Faults Based on Multi-detection Technology Fusion

For partial discharge (PD) in transformer, every single detection method has its limitation and cannot solve all the problems perfectly. To overcome the limitation of single detection method and improve the reliability of partial discharge detection, this study proposed a diagnosis approach based on multi-detection technology fusion of Dissolved Gas Analysis (DGA), PD ultrasonic location and PD test of long-duration AC withstand voltage test. The effectiveness of the fusion detection method was confirmed by diagnosing of an internal discharge fault in a 110kV power transformer. Finally, preventive measures are presented, which give emphasis on manufacturing process, test results analysis, overhaul and examination, and so on.