Frequency Range of UHF PD Measurements in Power Transformers

Stefan Tenbohlen, Chandra Prakash Beura, Wojciech Sikorski, Ricardo Albarracín Sánchez, Bruno Albuquerque de Castro, Michael Beltle, Pascal Fehlmann, Martin Judd, Falk Werner and Martin Siegel
Additional contact information
Stefan Tenbohlen: Institute of Power Transmission and High Voltage Technology (IEH), University of Stuttgart, 70569 Stuttgart, Germany
Chandra Prakash Beura: Institute of Power Transmission and High Voltage Technology (IEH), University of Stuttgart, 70569 Stuttgart, Germany
Wojciech Sikorski: Institute of Electrical Power Engineering, Poznan University of Technology, Piotrowo 3A, 60-965 Poznan, Poland
Ricardo Albarracín Sánchez: Department of Electrical and Electronic Engineering, Automatic Control, and Applied Physics, School of Industrial Design and Engineering (ETSIDI), Universidad Politécnica de Madrid (UPM), Ronda de Valencia 3, 28012 Madrid, Spain
Bruno Albuquerque de Castro: Department of Electrical Engineering, School of Engineering, São Paulo State University (UNESP), Bauru 17033-360, SP, Brazil
Michael Beltle: Institute of Power Transmission and High Voltage Technology (IEH), University of Stuttgart, 70569 Stuttgart, Germany
Pascal Fehlmann: FKH Fachkommission für Hochspannungsfragen, 8050 Zürich, Switzerland
Martin Judd: High Frequency Diagnostics and Engineering Ltd., Clydeway House, 813 South Street, Glasgow G14 0BX, UK
Falk Werner: Doble Engineering Company, Marlborough, MA 01752, USA

Energies, 2023, vol. 16, issue 3, 1-21

Abstract: Although partial discharge (PD) measurement is a well-accepted technology to assess the quality of the insulation system of power transformers, there are still uncertainties about which frequency range PDs radiate and which frequency range should be evaluated in a measurement. This paper discusses both a UHF PD frequency range obtained from studies investigating laboratory experiments and a frequency range from numerous practical use cases with online and on-site measurements. The literature review reveals a frequency spectrum of ultrahigh-frequency (UHF) PD measurements in the range of 200 MHz to 1 GHz for most publications. Newer publications extend this range from 3 to 6 GHz. The use cases present UHF PD measurements at transformers with power ratings up to 1000 MVA to determine frequency ranges which are considered effective for practical applications. The “common” frequency range, where measurements from all use cases provide signal power, is from approximately 400 MHz to 900 MHz, but it is noted that the individual frequency range, as well as the peak UHF signal power, strongly varies from case to case. We conclude from the discussed laboratory experiments and practical observations that UHF PD measurements in power transformers using either valve or window antennas, according to Cigré, are feasible methods to detect PD.

Keywords: power transformers; partial discharge; PD; UHF; monitoring; PD sensors; frequency range (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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