Experimental Study of the Corona Performance of Aged Sand-Cast Substation Connectors

Jordi-Roger Riba, Santiago Bogarra, Álvaro Gómez-Pau and Manuel Moreno-Eguilaz
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Jordi-Roger Riba: Electrical Engineering Department, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain
Santiago Bogarra: Electrical Engineering Department, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain
Álvaro Gómez-Pau: Electronics Engineering Department, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain
Manuel Moreno-Eguilaz: Electronics Engineering Department, Universitat Politècnica de Catalunya, 08222 Terrassa, Spain

Energies, 2020, vol. 13, issue 11, 1-13

Abstract: Substation connectors, like many other high-voltage products, are tested once manufactured. However, the corona behavior of aged specimens can differ from that exhibited by newer ones, thus generating detrimental technical and environmental effects. Manufacturers need to know the long-term corona behavior of substation connectors to offer their customers maximum safety and transparency about such critical products. This paper analyzes the ageing effect on the surface roughness and the visual corona extinction voltage of sand-cast aluminum connectors, which were artificially aged in a salt spray chamber for different periods. The experimental results show an important variability of the surface roughness and corona extinction voltage (CEV) among connectors with the same ageing level due to the sand-casting manufacturing process. The results in this paper also show a slight increase in the surface roughness with the ageing period, although there is not a clear pattern between the applied ageing level and the experimental CEV value. It is concluded that the inherent variability among connectors due to the sand-cast process has more influence than the ageing effect itself.

Keywords: corona effect; ageing; substation connectors; high-voltage; sand casting (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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