Title :
The Barrier Effect on Breakdown for Design of 154 kV Class HTS Transformer
Author :
Cheon, H.G. ; Choi, J.H. ; Kim, K.J. ; Lee, H.G. ; Kim, S.H.
Author_Institution :
Dept. of Electr. Eng., Gyeongsang Nat. Univ., Jinju, South Korea
fDate :
6/1/2011 12:00:00 AM
Abstract :
LN2 is used as an insulating material as well as a cryogen for a 154 kV class HTS transformer. However, main insulation with LN2 is not enough, and thus, research on barrier has been performed. The most of experiments on this barrier effect are combination of paper and air (air, SF6, etc.), and also the results from these experiments on barrier effect are insufficient to be used practically for the electric insulation design of the 154 kV class HTS transformer. Moreover, there are insufficient researches regarding cryogenic liquid used for superconducting equipments. In this paper, we examined the breakdown properties of the barrier related to the position, number and materials. With the database in the electrical breakdown properties, the electric insulation design as the main insulation for the 154 kV class.
Keywords :
cryogenics; electric breakdown; high-temperature superconductors; insulating materials; nitrogen; superconducting transformers; HTS transformer; barrier effect; cryogen; cryogenic liquid; electric insulation design; electrical breakdown properties; high temperature superconducting transformer; insulating material; superconducting equipment; voltage 154 kV; Electric breakdown; Electrodes; High temperature superconductors; Insulation; Power transformer insulation; Windings; Barrier; GFRP; breakdown; pressboard;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2093113
