Title :
Analysis of UHF PD monitoring data by means of normalized cross-correlation
Author :
Beltle, M. ; Muller, A. ; Tenbohlen, Stefan
Author_Institution :
Inst. of Power Transm. & High Voltage Technol., Univ. of Stuttgart, Stuttgart, Germany
Abstract :
The paper presents a long-term monitoring example of an aged generator step-up transformer with several PD sources showing different activity. Monitoring data is recorded by the use of the electromagnetic PD measurement method, also known as the UHF-method. The phase resolved PD patterns of collected UHF measuring data are analyzed using cross-correlation. The method searches for characteristics of a typical pattern called template. PRPD patterns of the entire dataset are evaluated. The result is the time dependent occurrence of a specific pattern, respectively a specific PD source.
Keywords :
partial discharges; power transformers; PD sources; PRPD patterns; UHF PD monitoring data analysis; UHF measuring data; UHF-method; aged generator step-up transformer; cross-correlation; data monitoring; electromagnetic PD measurement method; long-term monitoring example; normalized cross-correlation; Correlation; Correlation coefficient; Monitoring; Oil insulation; Partial discharges; Power transformers; UHF measurements; cross-correlation; long-term UHF measurement; monitoring; partical discharge; phase resolved patterns;
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
DOI :
10.1109/CMD.2012.6416321
