analysis algorithms using advanced measuring systems Nikola Kuljaca*, Sergio Meregalli*, Giuseppe Rizzi*, Claudio Ceretta**, Renato Gobbo**, Giancarlo Pesavento** ISH 2009 – 16th International Symposium on High Voltage Engineering Cape Town, South Africa, 24-28 Agosto 2009 * CESI RICERCA ** UNIVERSITA’ DI PADOVA Partial discharges (PD) are universally considered as one of the most important diagnostic indicators for the condition assessment of electrical equipment. The basic characteristics of traditional PD measuring systems are described in the relevant standard [1]. The transition from analogue to digital PD measuring systems has had a significant impact on the possibility to use the measurement for diagnostic purposes and, moreover, has allowed the development of various PD source separation and defect localisation techniques. Nowadays different digital PD measuring systems, allowing PD source separation and defect localisation, are commercially available. Some of them, for example, are based on synchronous multi-channel measuring systems [2], other implement ultra wide band signal acquisition [3]. The proposed paper describes the research and development of advanced partial discharge analysis techniques and algorithms, focusing on the development of a custom ultra wide band measuring system. The adopted digital signal processing algorithms and the measurement results obtained from laboratory tests carried out both on different naturally aged and on artificially defected MV cable samples will be presented and discussed. REFERENCES [1] IEC 60270, "High-voltage test techniques – Partial discharge measurements", ed. 2000-12 [2] S. Schaper, A. Obralic, W. Kalkner, R. Plath "Synchronous multi-terminal on-site PD measurements on power transformers with an enhanced time differential evaluation method", 15th International Conference on High Voltage Engineering, Slovenia, Ljubljana 2007. [3] A. Cavallini, M. Conti, G. C. Montanari "Digital Detection and Fuzzy Classification of Partial Discharge Signals", IEEE Transactions on dielecrics and Electrical insulation, Vol. 9, No. 3, 2002. Contact details of primary author: Nikola Kuljaca, Dr. CESI RICERCA Via R.Rubattino 54, Milano, 20134 Italy e-mail: nikola.kuljac@cesiricerca.it Tel: +39 0239925279 Fax: +39 0239925557