发电机环氧云母绝缘频域介电谱特性研究

发布时间：2018-03-24 14:18

本文选题：频域介电谱　切入点：发电机　出处：《西南交通大学学报》2017年01期

【摘要】：为了将频域介电谱法(FDS)用于发电机环氧云母绝缘老化状态的无损诊断,对发电机线棒试样进行了多因子加速老化处理,测量了不同老化周期线棒试样的频域介电谱,建立了带直流电导修正的双弛豫Cole-Cole模型,研究了绝缘的老化对复介电常数及Cole-Cole模型弛豫参数的影响.研究结果表明:随老化时间延长,试样的复介电常数实部和虚部均逐渐增大,在较低频段(0.001~1.000 Hz),增大趋势更为明显;老化改变了环氧云母绝缘体系的弛豫机制,在后3个老化周期的频谱中产生了新的弛豫过程,导致在双弛豫Cole-Cole模型中所描述的β弛豫过程与前2个周期不同;采用双弛豫Cole-Cole模型可以较好地拟合测试值,随老化的进行,直流电导率和α弛豫强度迅速增大,界面极化弛豫时间常数有减小趋势.
[Abstract]:In order to apply the frequency domain dielectric spectrum method (FDS) to the nondestructive diagnosis of generator epoxy mica insulation aging state, the multifactor accelerated aging treatment of generator wire rod samples was carried out, and the frequency domain dielectric spectra of the generator wire rod specimens with different aging cycles were measured. A double relaxation Cole-Cole model with DC conductance correction is established. The effects of aging of insulation on complex dielectric constant and relaxation parameters of Cole-Cole model are studied. The results show that the aging time increases with aging. The real and imaginary parts of the complex dielectric constant of the samples increased gradually, and the increasing trend was more obvious in the lower frequency range of 0.001 ~ 1.000 Hz, and the aging changed the relaxation mechanism of the epoxy mica insulation system, resulting in a new relaxation process in the spectrum of the last three aging cycles. As a result, the 尾 relaxation process described in the double relaxation Cole-Cole model is different from that in the first two periods, the measured values can be fitted well by using the double relaxation Cole-Cole model, and the DC conductivity and 伪 relaxation strength increase rapidly with aging. The interfacial polarization relaxation time constant tends to decrease.
【作者单位】：西南交通大学电气工程学院;
【基金】：国家自然科学基金资助项目(51177136)
【分类号】：TM31

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