Title :
Study of aging characteristics of generator stator insulation based on temperature spectrum of dielectric dissipation factor
Author :
Ma, Xiaoqin ; Ma, Xiaowei ; Yue, Bo ; Lu, Weisheng ; Xie, Hengkun
Author_Institution :
State Key Lab. of Electr. Insulation for Power Equipment, Xi´´an Jiaotong Univ., China
Abstract :
In this paper, accelerated multi-factor aging tests in laboratory have been conducted on the stator bars of a large generator. During the period of aging, the temperature spectra of dielectric dissipation factor tan δ of stator insulation were employed to investigate aging characteristics of insulation materials. Test results showed that the peak temperature Tm of the tan δ -T curve under 0.2Un shifts to higher temperature with aging time. At the same time, the gradient of the peak decreased with aging time and the peak even disappeared in the measurement range of temperature finally. It was suggested that temperature spectra of dielectric dissipation factor tan δ of stator insulation could be used to estimate the aging condition of large generator stator insulation.
Keywords :
AC generators; ageing; insulation testing; machine insulation; stators; dielectric dissipation factor; generator stator insulation; insulation materials; multifactor aging tests; stator bars; stator insulation; temperature spectra; Accelerated aging; Character generation; Conducting materials; Dielectric materials; Dielectrics and electrical insulation; Laboratories; Life estimation; Stator bars; Temperature measurement; Testing;
Conference_Titel :
Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on
Print_ISBN :
0-7803-7725-7
DOI :
10.1109/ICPADM.2003.1218410
