Title :
A Comparison Of The AC Breakdown Strength Of New And Used Poly-α Olefin Coolant
Author :
Yeckel, C. ; Curry, R.D. ; Norgard, P.
Author_Institution :
Univ. of Missouri, Columbia
Abstract :
The breakdown performance of an advanced synthetic dielectric coolant, poly-alpha olefin, is compared to conventional transformer oil over a range of temperatures from 10 to 50degC. The poly-alpha olefin oil is first benchmarked against conventional transformer oil, and then compared to poly-alpha olefin oil that has been exposed to a large number of high-energy discharges in order to establish the effects of oil age on performance. The results obtained from the standard ANSI D877 test procedure are compared to the results of a modified test procedure that incorporates sparging of the oil with dry nitrogen. Tests to determine the effects of nitrogen sparging on the water concentration of the poly-alpha olefin are analyzed. Concerns regarding the dependence of voltage breakdown values on oil viscosity are also discussed.
Keywords :
coolants; discharges (electric); insulating oils; insulation testing; polymers; viscosity; AC breakdown strength; conventional transformer oil; high-energy discharges; nitrogen sparging effects; oil age effect; oil viscosity; poly-alpha olefin coolant; standard ANSI D877 test procedure; synthetic dielectric coolant; temperature 10 C to 50 C; voltage breakdown; water concentration test; ANSI standards; Benchmark testing; Coolants; Dielectric breakdown; Electric breakdown; Nitrogen; Oil insulation; Petroleum; Temperature distribution; Viscosity;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2007.4286512
