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Open AccessEditor’s ChoiceArticle

Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers

1
BSS Hochspannungstechnik GmbH, 71229 Leonberg, Germany
2
Faculty of Electrical Engineering and Information Technology (EIT), University of Applied Science Karlsruhe, 76133 Karlsruhe, Germany
3
Institute of Power Transmission and High Voltage Technology (IEH), University of Stuttgart, 70569 Stuttgart, Germany
4
Siemens AG, Transformer Lifecycle Management, 90461 Nürnberg, Germany
5
FKH Fachkommission für Hochspannungsfragen, 8050 Zürich, Switzerland
6
OMICRON Energy Solutions GmbH, 12099 Berlin, Germany
7
GE Grid GmbH, 41065 Mönchengladbach, Germany
8
Siemens AG Österreich, Transformers Weiz, 8160 Weiz, Austria
9
QUALITROL LLC, Fairport, NY 14450, USA
10
AF Engineers + Consultants (AFEC) GmbH, 3807 Istelwald, Switzerland
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3058; https://doi.org/10.3390/en12163058
Received: 10 July 2019 / Revised: 30 July 2019 / Accepted: 5 August 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Power Transformer Condition Assessment)
The continuous, non-intermitted service of electrical grids relies on the reliability of their assets, e.g., power transformers. Local insulation defects can result in serve failures such as breakdowns with severe subsequent costs. The prevention of such events is crucial. Hence, partial discharge (PD) activity at power transformers is evaluated directly in the factory before shipment. Additionally, PD activity can be monitored during service using the ultra-high frequency (UHF) method. In this contribution, a calibration procedure is proposed for the UHF method. The calibration process is required to ensure both, reproducibility and comparability of UHF measurements: Only a calibrated UHF measurement procedure can be introduced supplementary to IEC 60270 in acceptance tests of power transformers. The proposed calibration method considers two factors: The influence of the UHF-antenna’s sensitivity and the PD recorder characteristics including accessories such as cable damping, pre-amplifier, etc. The former is addressed by a characterization of UHF sensors using the standard antenna factor (AF) in a gigahertz transverse electromagnetic (GTEM) cell. The PD recorder’s influence is corrected by using a defined, invariable test signal as reference for all recording devices. A practical evaluation of the proposed calibration procedure is performed in a laboratory setup using different UHF recording devices and UHF sensors using artificial PD signals and real voltage-driven PD sources. View Full-Text
Keywords: power transformers; partial discharge; PD; UHF; calibration; monitoring; acceptance tests; IEC 60270; PD sensors; antenna factor power transformers; partial discharge; PD; UHF; calibration; monitoring; acceptance tests; IEC 60270; PD sensors; antenna factor
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MDPI and ACS Style

Siegel, M.; Coenen, S.; Beltle, M.; Tenbohlen, S.; Weber, M.; Fehlmann, P.; Hoek, S.M.; Kempf, U.; Schwarz, R.; Linn, T.; Fuhr, J. Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers. Energies 2019, 12, 3058. https://doi.org/10.3390/en12163058

AMA Style

Siegel M, Coenen S, Beltle M, Tenbohlen S, Weber M, Fehlmann P, Hoek SM, Kempf U, Schwarz R, Linn T, Fuhr J. Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers. Energies. 2019; 12(16):3058. https://doi.org/10.3390/en12163058

Chicago/Turabian Style

Siegel, Martin; Coenen, Sebastian; Beltle, Michael; Tenbohlen, Stefan; Weber, Marc; Fehlmann, Pascal; Hoek, Stefan M.; Kempf, Ulrich; Schwarz, Robert; Linn, Thomas; Fuhr, Jitka. 2019. "Calibration Proposal for UHF Partial Discharge Measurements at Power Transformers" Energies 12, no. 16: 3058. https://doi.org/10.3390/en12163058

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