Shielding effect of power transformers tanks in the ultra-high-frequency detection of partial discharges

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Show simple item record Robles Muñoz, Guillermo Albarracín Sánchez, Ricardo Martínez Tarifa, Juan Manuel 2013-06-20T11:30:55Z 2013-06-20T11:30:55Z 2013-04
dc.identifier.bibliographicCitation IEEE Transactions on dielectrics and electrical insulation, 2013, 20(2), 678-684.
dc.identifier.issn 1070-9878
dc.description.abstract Partial discharges (PD) measurement is a well-known technique for judgment of the condition of power transformer offline. Phase-resolved PD measurement is a normalized technique for PD tests, but noise, especially by PD-measurements onsite is sometimes difficult to reject, and a post-processing of a pattern is necessary to separate different sources. Higher-frequency-detection devices and processing strategies are useful for PD classification and identification. Recently, ultra-high-frequency (UHF) detection by means of antennas has been shown to be a promising detection system for both offline and online PD-measurements. However, it is necessary to assess whether PD source separation and classification is possible by means of pulse analysis because some additional UHF noise sources are coupled to the detected signals, and it is not clear whether different sources produce different pulses. In this study, the attenuation effect of the metallic tank of a power transformer on the inner PD activity when measured outside the tank was studied. Additionally, experiments were conducted to detect and characterize two different PD sources (internal and external discharges) using two antennas measuring the same phenomenon inside and outside of a transformer. It will also be shown that broadband UHF signals are useful for PD recognition and that a deep study of frequencies below 500 MHz can separate PD occurring inside from those occurring outside when measured with an antenna outside the tank.
dc.description.sponsorship This research has been supported by the Spanish Science and Technology Ministry under contract DPI 2009-14628- C03-02 and by the Madrid Regional Government and Universidad Carlos III de Madrid under contract CCG10- UC3M/DPI-4627. Tests have been made in the High Voltage Research and Tests Laboratory of Universidad Carlos III de Madrid (LINEALT).
dc.format.extent 7
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher IEEE
dc.rights © IEEE
dc.subject.other UHF antennas
dc.subject.other UHF measurement
dc.subject.other Partial discharge measurement
dc.subject.other Power transformers
dc.subject.other Shielding
dc.title Shielding effect of power transformers tanks in the ultra-high-frequency detection of partial discharges
dc.type article
dc.description.status Publicado
dc.subject.eciencia Ingeniería Industrial
dc.subject.eciencia Materiales
dc.identifier.doi 10.1109/TDEI.2013.6508772
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 678
dc.identifier.publicationissue 2
dc.identifier.publicationlastpage 684
dc.identifier.publicationtitle IEEE Transactions on dielectrics and electrical insulation
dc.identifier.publicationvolume 20
dc.identifier.uxxi AR/0000013247
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