Identification and detection of slot discharges during acceleratedaging tests

摘要

Partial-discharge amplitude distribution (PDAD) analysis can beusefully applied in the detection and identification of slot dischargeactivity during accelerated aging tests. A sequential thermal,mechanical, and electric stress was applied to 10 U-shape framessimulating complete stator slots, in order to reproduce slot dischargesin a relatively short time. From a Weibull plot of the detectedcumulative distributions, the slot discharges can be identified by theirdistinctive pattern even though the inception of the phenomena may bemixed up with other discharge patterns. These results confirm thevalidity of the PDAD shape analysis approach as a possible tool forclassifying the detected phenomena both in the laboratory and duringpartial discharge measurements in HV generator stator windings