摘要
提出一种判断油纸绝缘设备弛豫响应扩展德拜等效电路极化支路数的方法。该方法应用微分解谱法,对油纸绝缘设备测试获得的回复电压谱线进行逐次解谱,将隐含在回复电压谱线中的弛豫响应特征以子谱线的形式展现出来。然后根据回复电压微分子谱线的数量,判断扩展德拜等效电路的极化支路数。研究发现,随着油纸绝缘设备老化程度的不断劣化,弛豫响应极化支路及其松弛极化强度也伴随之增大。如果油纸绝缘设备的绝缘状况良好,则松弛极化强度值较小,反之油纸设备的绝缘状况越差,弛豫极化强度越强其值就越大。该方法为应用弛豫响应等效电路判别油纸绝缘设备老化状况提供了一种有力的分析手段。
A judgment method for the polarization branches number of the equivalent circuit of oil-paper insulation equipment is proposed. The differential dielectric spectroscopy method is applied to gradually decomposing the measured return voltage curves. In this way,all the sub-lines which are implicit in the internal relaxation response of the return voltage curves could be presented. Then the polarization branches number of extended Debye model is judged by the number of sub-lines. Results show that the more aging seriousness of the transformer oil-paper insulation is, the more numbers of the polarization branches and the higher relaxation polarization will be. The value of the relaxation polarization is small when the oil-paper insulation is in good condition. Otherwise,the value is greater. The proposed method is an effective way to evaluate the oil-paper aging using the equivalent circuit of relaxation response.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第15期204-212,共9页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(61174117)
关键词
弛豫响应
回复电压
微分解谱
等效电路
松弛极化强度
Relaxation response
return voltage
differential dielectric spectrum
equivalent circuit
relaxation polarization
