Title :
Electrical aging lifetime model of oil-impregnated paper under pulsating DC voltage influenced by temperature
Author :
Jian Li ; Zhiman He ; Grzybowski, S.
Author_Institution :
State Key Lab. of Power Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Abstract :
Main insulation of windings connected with valves in high voltage direct current (HVDC) convert transformers withstands pulsating DC voltages. This paper presents breakdown properties of oil-impregnated paper under pulsating DC voltages at different temperatures. Progressive stress tests were carried out to obtain breakdown voltages of oil-impregnated paper with thickness of 0.2 mm under pulsating DC voltages at different temperatures. Constant stress tests were executed to measure time to breakdown of the oil-paper specimens. Both types of the experiments were also undertaken under either AC or DC voltages. An electrical aging lifetime model was proposed for the oil-impregnated paper, and parameters of the electrical aging lifetime model were presented. Experiments and analysis results show that the breakdown voltages and time to breakdown of oil-paper insulation are influenced by temperature significantly.
Keywords :
HVDC power convertors; ageing; electric breakdown; impregnated insulation; paper; power transformer insulation; stress analysis; time measurement; transformer oil; transformer windings; HVDC converter transformer; breakdown property; electrical aging lifetime model; high voltage direct current converter transformer; oil-impregnated paper; oil-paper insulation breakdown; progressive stress testing; pulsating DC voltage; size 0.2 mm; time measurement; valve; windings insulation; Aging; Breakdown voltage; Electric breakdown; Insulation; Stress; Temperature measurement; Voltage measurement; Oil-impregnated paper; converter transformer; electrical aging; life model; pulsating DC voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
DOI :
10.1109/TDEI.2013.6678846
