采用向量匹配法的油纸绝缘系统扩展Debye模型参数识别

发布时间：2018-04-03 03:16

本文选题：油纸绝缘　切入点：扩展Debye模型　出处：《高电压技术》2014年02期

【摘要】：为了从时域数据中获取更丰富的表征油纸绝缘系统绝缘状态的信息,提出了一种获取油纸绝缘系统扩展Debye模型参数的方法。首先通过快速Fourier变换(FFT)获得极化去极化电流(PDC)实验的去极化电流频谱,然后使用向量匹配法(VFM)和时域非线性拟合算法(FNA),确定其频谱的极点和留数分布,最后根据极点和留数计算得到各支路参数。针对实验室不同老化程度和不同温度下的油纸绝缘模型,开展了验证性的PDC和频谱(FDS)实验,利用PDC实验数据求取了相应的扩展Debye模型,据此获得了介损(tanδ)随频率的变化曲线,并与FDS所得结果进行了比较。结果表明,PDC所得结果与FDS曲线在低频段一致,验证了所提方法的正确性。进而提出在对油纸绝缘设备绝缘状况进行测试时,采用FDS做高频测试,而采用PDC代替FDS做低频测试,从而减少测试时间,即将PDC与FDS这2种方法相结合,可以提高现场油纸绝缘设备的检测效率。
[Abstract]:In order to obtain more information about the insulation state of oil-paper insulation system from time domain data, a method for obtaining the parameters of extended Debye model of oil-paper insulation system is proposed.First, the depolarization current spectrum of the polarization depolarization current (PDC) experiment is obtained by fast Fourier transform. Then, the pole and residue distribution of the spectrum are determined by using the vector matching method (VFM) and the time-domain nonlinear fitting algorithm (Fourier).Finally, the parameters of each branch are calculated according to the poles and residues.Based on the oil-paper insulation model with different aging degree and different temperature in laboratory, confirmatory PDC and spectrum PDC experiments were carried out. The corresponding extended Debye model was obtained by using the PDC experimental data, and the curves of dielectric loss tan 未) with frequency were obtained.The results are compared with those obtained by FDS.The results show that the proposed method is consistent with the FDS curve at low frequency.Furthermore, when testing the insulation condition of oil-paper insulation equipment, FDS is used to do high frequency test, and PDC instead of FDS is used to do low frequency test, so as to reduce the test time, that is, the combination of PDC and FDS.It can improve the testing efficiency of oil-paper insulation equipment.
【作者单位】：西安交通大学电力设备电气绝缘国家重点实验室;河南省电力科学研究院;焦作市供电公司;
【基金】：国家高技术研究发展计划(863计划)(2007AA04Z411)~~
【分类号】：TM855.1

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