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Influence of an insulating spacer on the V-t characteristics of a coaxial gas-insulated cable. II. Tests on EHV buses

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3 Author(s)
Trinh, N.G. ; Inst. de Recherche d''Hydro-Quebec, Varennes, Que., Canada ; Vincent, C. ; Mitchel, G.

For pt.I see ibid., vol.3, no.1, p.16-25 (1988). The V- t characteristics of EHV buses were evaluated for two configurations with rated voltages of 550 and 800 kV. The bus dimensions were 6 m in length and 17.8/53.3 cm and 20.3-61 cm in diameter, respectively. They were each fitted with two tripod-type epoxy spacers. The results show a pronounced influence of the supporting spacers on the V-t characteristic, corresponding to a reduced withstand voltage and less dispersion in the measured breakdown voltages. A statistical method is presented for deriving the V- t characteristics of a gas-insulated system from those of the individual components

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Power Delivery, IEEE Transactions on  (Volume:3 ,  Issue: 1 )