Experimental Investigation of the Spatial and Temporal Evolution of the Tangential and Normal E-Field Components along the Stress Grading System of a Real Stator Bar

Gbah Koné, Christophe Volat, Claude Hudon and Simon Bernier
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Gbah Koné: Laboratory of Modelling and Diagnostic of Electrical Power Network Equipment (MODELE), Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC G7H 2B1, Canada
Christophe Volat: Laboratory of Modelling and Diagnostic of Electrical Power Network Equipment (MODELE), Université du Québec à Chicoutimi, 555 Boulevard de l’Université, Chicoutimi, QC G7H 2B1, Canada
Claude Hudon: Institut de Recherche d’Hydro-Québec (IREQ), Hydro-Québec, 1800 Boulevard Lionel-Boulet, Varennes, QC J3X 1S1, Canada
Simon Bernier: Institut de Recherche d’Hydro-Québec (IREQ), Hydro-Québec, 1800 Boulevard Lionel-Boulet, Varennes, QC J3X 1S1, Canada

Energies, 2020, vol. 13, issue 3, 1-16

Abstract: This paper presents results based on direct experimental measurements of tangential (E t ) and normal (E n ) E-field components along the stress grading system (SGS) of a real stator bar (Roebel type) for different AC 60 Hz applied voltages. These measurements were made with a new electro-optic system allowing for the study of both spatial distributions of two E-field components along the bar and their temporal evolution at critical points. The results obtained allowed us to calculate the correlation between the distribution of E n and E t along the SGS. In particular, it was demonstrated that the E n distribution presents a characteristic minimum, which can be used to identify the zone of partial discharge inception. Moreover, it was possible to observe an enlargement of the E t component distribution followed by a saturation in magnitude with the applied voltage increase. Moreover, the results have demonstrated that the waveform of the E n component is mostly affected by the SG material used, producing a greater distortion in its waveform than those obtained for the E t component. The more significant distortion was obtained at the end of the outer corona protection (OCP) material, corresponding to the first maximum of the E n component and characterized by the appearance of a third harmonic of large amplitude.

Keywords: stress-grading system; stator bar; normal and tangential E-field components; electro-optic sensor (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: 2020
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