Partial damp diagnostic method of oil-paper insulating bushing based on frequency domain spectroscopy
CHEN Xiaolin,
FU Xiaotao,
WU Qiandong,
ZHAO Haoxiang,
LI Yuan,
MU Haibao
Affiliations
CHEN Xiaolin
Electric Power Research Institute of Hainan Power Grid Co., Ltd., Haikou 570311, China;Hainan Key Laboratory of Physical and Chemical Analysis of Power Grid, Haikou 570311, China
FU Xiaotao
Electric Power Research Institute of Hainan Power Grid Co., Ltd., Haikou 570311, China;Hainan Key Laboratory of Physical and Chemical Analysis of Power Grid, Haikou 570311, China
WU Qiandong
Electric Power Research Institute of Hainan Power Grid Co., Ltd., Haikou 570311, China;Hainan Key Laboratory of Physical and Chemical Analysis of Power Grid, Haikou 570311, China
ZHAO Haoxiang
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
LI Yuan
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
MU Haibao
State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
Partial dampness is the initial stage in the bushing damp process,so the effective diagnosis of partial dampness can avoid the further development of the damp. The partial damp diagnosis method of bushing based on the frequency domain spectroscopy (FDS) is proposed in this paper. Firstly,oil-paper insulation samples with different moisture content are prepared,and partial damped samples are formed through combination. Then the FDS characteristics are obtained. The results show that partial distribution of moisture leads to oil-paper insulation interfaces with different moisture content,and the interface relaxation polarization loss peak is introduced in the FDS curves. The greater the degree of partial dampness in the radial direction,the greater the amplitude of the loss peak,and it moves to the high frequency direction. The effectiveness of the diagnosis of partial dampness of bushing based on the characteristics of the interface relaxation polarization loss peak is verified by the simulation model of the transformer bushing. It shows that a new method for early fault warning and diagnosis of the transformer bushing is provided.
