Placement of UHF Sensors on Power Transformers

Conference: VDE-Hochspannungstechnik 2018 - ETG-Fachtagung
11/12/2018 - 11/14/2018 at Berlin, Deutschland

Proceedings: ETG-Fb. 157: VDE-Hochspannungstechnik

Pages: 6Language: englishTyp: PDF

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Coenen, Sebastian (GE Grid GmbH, Mönchengladbach, Germany)
Haessig, Martin (Swissgrid, Aarau, Schweiz)
Siegel, Martin (BSS Hochspannungstechnik GmbH, Stuttgart, Germany)
Fuhr, Jitka (AFEC, Iseltwald, Schweiz)
Neuhold, Stefan; Bruegger, Thomas (FKH - Fachkommission für Hochspannungsfragen, Zürich, Schweiz)
Hoek, Stefan (OMICRON, Berlin, Germany)
Linn, Thomas (Qualitrol, Wettingen, Schweiz)

This paper provides recommendations for a useful placement of UHF sensors for PD measurements in power transformers. Further a recommendation will be given about the number of sensors needed to achieve a sufficient UHF PD measurement sensitivity. The recommendations have been evaluated by comparative measurements on a 800/3 MVA transformer and the results have been documented and analysed in this paper. Different types of sensors (a drain valve sensor, several dielectric window sensors) as well as different PD measuring systems (Oscilloscope, Spectrum analyser, different commercial available systems) and different signal generators for simulating UHF PD impulses (rectangular and exponential shapes) have been used to investigate the signal propagation throughout the transformer tank.