Translated Title
Study on aging diagnosis method of transformer oil-paper insulation
Translated Abstract
It is important to reduce the faulted rate of transformer and improve the reliability of power supply that the insulation aging condition of transformer oil-paper is diagnosed accurately. An aging diagnosis method of oil-paper insulated transformer based on equivalent circuit was pro-posed in this paper.Firstly,based on the return voltage method,the characteristics of polariza-tion spectrum was analyzed,and then the extended Debye equivalent circuit of oil-paper insulated transformer was built.By equivalent circuit parameters comparison of multiple transformers with different aging degree,the internal relationships between oil-paper insulated transformer under different aging condition and the parameters of related equivalent circuit was studied.The oil-pa-per insulated transformer aging diagnosis was thus realized.Research results showed that using the parameters of equivalent circuit could diagnose the transformer oil-paper insulation in aging condition effectively and accurately.The small time constant branches of the equivalent circuit reflect the aging condition of insulated oil which have fast response speed of relaxation,the large time constant branches of the equivalent circuit reflect the aging condition of insulated paper which have low response speed of relaxation,and the medium time constant branches of the equivalent circuit reflect the polarization phenomenon of oil-paper insulation interface.
Translated Keyword
aging diagnosis
polarization branch
return voltage
transformer oil-paper insulation
Access Number
WF:perioarticalcsdlxyxb201503016
