摘要
变压器绝缘的老化会影响其预试电气绝缘试验结果,但对于它影响试验结果的机理及程度,国内外尚未开展有效研究。为此,结合变压器油纸绝缘的扩展德拜模型,在国外研究者所提供的一套实际变压器的等效模型具体参数值的基础上,仿真研究了变压器油纸绝缘老化对其预试电气绝缘参数(绝缘电阻R60s、吸收比K、极化指数PI和工频电容量C、介损tanδ)的影响。结果表明,变压器预试电气绝缘参数的影响因素多而复杂,且绝缘油、纸的老化对不同电气绝缘参数的影响存在较大区别。初步认为,绝缘油的老化基本不影响绝缘电阻R60s、极化指数PI和工频电容C,但使介损tanδ小幅度增加,同时增大了吸收比K;而绝缘纸的老化对绝缘电阻R60s、吸收比K、极化指数PI的影响较大,会使它们减小,同时小幅度地增大了介损tanδ,但它对变压器的工频电容C没有影响。
The lifetime of oil-immersed power transformers is mainly determined by the condition of their own insula- tion systems. The predictive electrical insulation test is an important routine method to estimate the insulation condition. The test results are generally influenced by the aging of oil-paper insulation in transformers, but the effective study on how and what degree the results are influenced is still not developed at home and abroad. This paper simulates the relationship between the aging condition of oil-paper insulation and the predictive electrical insulation test （insulation resistance R60s, absorption ratio K, polarization index Pl, capacitance C and dielectric dissipation factor tan δ） results based on the extended Debye model, with a set of parameter values of the equivalent model from an oil-immersed power transformer deduced by theresearcher abroad. The simulation results show that the influence factors on the electrical insulation parameters are complicated, and the aging processes of solid insulating materials and oil have definitely different effects on the parameters. The aging of oil has little effect on the parameter values of R60s, P1 and C, increases the value of tan 3 a little and that of K. But the aging of solid insulating materials evidently decreases the values of R60s, K and P1, increases the value of tanδ a little, and has little effect on the value of C.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第7期1618-1623,共6页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(2007AA04Z411)
国家重点基础研究发展计划(973计划)(2009CB724505-1)~~
关键词
变压器
油纸绝缘
老化
预防性试验
电气绝缘参数
仿真
transformer
oil-paper inSulation
aging
predictive test
electrical insulation parameters
simulation
