%0 Journal Article %T 发电机环氧云母绝缘频域介电谱特性研究<br>Frequency-Domain Dielectric Spectroscopy Characteristics of Generator Epoxy/Mica Insulation %A 高波 %A 郝长金 %A 李帅兵 %A 尹小兵 %A 俞孝峰 %A 吴广宁< %A br> %A GAO Bo %A HAO Changjin %A LI Shuaibing %A YIN Xiaobing %A YU Xiaofeng %A WU Guangning %J 西南交通大学学报 %D 2017 %R 10.3969/j.issn.0258-2724.2017.01.002 %X 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.<br>： To apply frequency domain dielectric spectroscopy technology (FDS) to the non-destructive diagnosis of epoxy/mica insulation, a generator winding bar sample was given an accelerated multi-stress aging treatment by combined use of thermal, electrical, and mechanical (vibration) aging methods, and its FDS parameters at different aging periods were measured experimentally. Based on these PDF parameters, a double relaxation Cole-Cole model with modified DC conductivity was established and effects of the insulation aging on the complex dielectric constant and relaxation Cole-Cole model parameters were analyzed. The results show that the real part and imaginary part of the complex dielectric constant increases gradually with aging time, and the increase tendency is more significant in the low-frequency band at 0.001-1.000 Hz. The mechanism of relaxation is changed by the aging of insulation, leading to a new relaxation process. Because of the new relaxation, the description of β relaxation in the double relaxation Cole-Cole model of the first two periods is incoherent with that of the last three periods. The test values of the dielectric spectrum can be well fitted by the double relaxation Cole-Cole model. With the aging, the DC conductivity and interfacial polarization increases quickly, and the interfacial polarization relaxation time constant tends to decrease. The study provides a new idea for aging status assessment of generator using FDS method %K 频域介电谱 %K 发电机 %K 环氧云母绝缘 %K 复介电常数 %K Cole-Cole模型 %K < %K br> %K frequency domain dielectric spectrum %K generator %K epoxy/mica insulation %K complex dielectric constant %K Cole-Cole mode %U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12368.shtml