Title :
The effect of fast transient overvoltages on 550 kV SF6/oil transformer bushings
Author :
Martins, Helvio J A ; Neves, Alexandre ; Amorim, Ivan B. ; Maranhao, F.
Author_Institution :
Centro de Pesquisas de Energia Eletrica, Rio de Janeiro, Brazil
Abstract :
This paper presents the results of the studies in a gas-insulated substation (GIS) about disconnector operations and short-circuits and their dielectric stress in the form of steep front waves on the main power transformer bushings of the Itaipu hydroelectric power plant, Brazil. As a singular point, the results of tests specially developed to confirm and determine safe operational levels and modifications required in the equipment in order to enable them to survive with these kinds of stresses are also presented
Keywords :
SF6 insulation; bushings; electric breakdown; gas insulated substations; gas insulated transformers; hydroelectric power stations; insulation testing; insulator testing; power transformer insulation; power transformer testing; transformer oil; transformer substations; 550 kV; dielectric stress; disconnector operations; gas-insulated substation; hydroelectric power plant; insulation breakdown testing; power transformer bushings; safe operational levels; short-circuits; steep front waves; Arresters; Circuit faults; Geographic Information Systems; Insulators; Oil insulation; Petroleum; Power generation; Power transformers; Stress; Surge protection;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549459
