Title :
A study on the breakdown characteristics of the fluorocarbon
Author :
Huh, Chang-Su ; Lee, Jae-Bok
Author_Institution :
Dept. of Electr. Eng., Inha Univ., Inchon, South Korea
Abstract :
In this paper, we investigated physical properties and electrical characteristics of the fluorocarbon used as coolants for large power gas-insulated transformers. Volume resistivity of the fluorocarbon is ρ=1.87×1015 [Ω·cm] at 1 atm, 27°C. Dielectric constant is 1.86 and decreases as temperature increases. The breakdown voltage at 1 atm is higher than that of transformer oil. The breakdown voltage of fluorocarbon vapor is about 18 kV when pressure in a test chamber increases over 1 kg/cm2. When fluorocarbon is mixed with SF6 gas, breakdown voltage of the mixture is higher than that of fluorocarbon. Then fluorocarbon leads to an increase over 4 kg/cm2 in pressure as the temperature increases. Therefore, when a gas-insulated transformer is manufactured, the design must be taken into consideration at high-pressure
Keywords :
SF6 insulation; electric breakdown; electrical conductivity measurement; gas insulated transformers; permittivity measurement; 1 atm; 18 kV; 27 C; SF6; SF6 gas; breakdown characteristics; breakdown voltage; dielectric constant measurement; fluorocarbon; fluorocarbon vapor; gas-insulated transformer; power gas-insulated transformers; test chamber; transformer oil; volume resistivity measurement; Conductivity; Coolants; Dielectric constant; Electric breakdown; Electric variables; Manufacturing; Oil insulation; Temperature; Testing; Transformers;
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.1996.549407
