Title :
Influence of an insulating spacer on the V-t characteristics of a coaxial gas-insulated cable. II. Tests on EHV buses
Author :
Trinh, N. Giao ; Vincent, Claire ; Mitchel, Garry
Author_Institution :
Inst. de Recherche d´´Hydro-Quebec, Varennes, Que., Canada
fDate :
1/1/1988 12:00:00 AM
Abstract :
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
Keywords :
busbars; cable insulation; electric breakdown of solids; gaseous insulation; insulators; power cables; 550 kV; 800 kV; EHV buses; V-t characteristics; breakdown voltages; coaxial gas-insulated cable; insulating spacer; reduced withstand voltage; statistical method; tripod-type epoxy spacers; Avalanche breakdown; Breakdown voltage; Cable insulation; Coaxial cables; Coaxial components; Delay effects; Delay estimation; Dispersion; Electrons; Gas insulation; Insulation; Statistical analysis; Testing;
Journal_Title :
Power Delivery, IEEE Transactions on
