摘要
为减小基于扩展Debye模型的老化状态评估方法对描述套管油纸绝缘劣化过程和解释老化机理时存在的误差,本文测试分析了不同老化程度油纸绝缘样品的极化-去极化(PDC)曲线,建立了考虑弛豫支路呈概率分布的分布式Debye模型,并通过正则化方法进行求解,最终提出了油纸绝缘套管老化状态的精确评估方法。结果表明:随老化程度的增加,极化电流整体向去极化电流增大、弛豫时间减小的方向移动,曲线达到稳定值的时间缩短;分布式Debye模型能够较好地描述老化油纸绝缘样品的多弛豫过程,正则化方法则能够较好地解决求解病态线性方程组时遇到的系统不适定问题;随着老化程度的增加,样品弛豫主峰所对应的弛豫时间分布函数概率密度增大,最可几弛豫时间常数逐渐减小;本文构建的老化状态评估模型具有较高的评估精度,误差均小于1.37%。
To reduce the errors of the ageing state evaluation method based on the extended Debye model in describing the degradation process and explaining the ageing mechanism of oil-paper insulation,the polarization-depolarization(PDC)curves of oil-paper insulation samples with different ageing degrees were tested and analyzed in this paper.A distributed Debye model considering the relaxation branches with probability distribution was established,and an accurate evaluation method for the ageing state of oil-paper insulation bushing was finally proposed by solving through regularization method.The results show that with the increase of ageing degree,the polarization current overall shifts towards the direction of increasing the depolarization current and decreasing the relaxation time,and the time for the curve to reach a stable value is shortened.The distributed Debye model can effectively describe the multiple relaxation processes of the aged oil-paper insulation samples,and the regularization method can effectively solve the system ill-posed problems encountered when solving ill-conditioned linear equation.As the ageing degree increases,the probability density of the relaxation time distribution function corresponding to the main relaxation peak of sample increases,and the most probable relaxation time constant gradually decreases.The ageing state evaluation model constructed in this paper has high evaluation accuracy,whose error is less than 1.37%.
作者
张荣伦
吴佳穗
管紫璇
吴坤和
王强
郭涛
ZHANG Ronglun;WU Jiasui;GUAN Zixuan;WU Kunhe;WANG Qiang;GUO Tao(Key Laboratory of Physical and Chemical Analysis for Electric Power of Hainan Province,Hainan Electric Power Research Institute,Haikou 570226,China)
出处
《绝缘材料》
CAS
北大核心
2024年第8期82-91,共10页
Insulating Materials
基金
中国南方电网有限责任公司科技项目(073000KK52200013)。
关键词
套管
油纸绝缘
时域介电谱
老化
弛豫时间分布
bushing
oil-paper insulation
time domain spectroscopy
ageing
relaxation time distribution
