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 The nondestructive parameters of multifactor aging test of motor stator bars, such as dielectric loss factor (tan δ ), capacitor (C) and the voltage at which charging current increases abruptly ( P i), are acquired by using Schering bridge and AC current method. Then the destructive parameter, namely residual breakdown voltage, is measured by breakdown test. Finally the correlation factors between these parameters and residual breakdown voltage were analyzed; Moreover the... The nondestructive parameters of multifactor aging test of motor stator bars, such as dielectric loss factor (tan δ ), capacitor (C) and the voltage at which charging current increases abruptly ( P i), are acquired by using Schering bridge and AC current method. Then the destructive parameter, namely residual breakdown voltage, is measured by breakdown test. Finally the correlation factors between these parameters and residual breakdown voltage were analyzed; Moreover the characteristic paramaters which were used to estimate the Epoxy/Mica insulation of stator windings are described.  对电机线棒进行了多因子老化试验 ,在不同的老化阶段 ,测试了线棒的介损 tanδ、电容、电流激增点等非破坏性和破坏性参数——剩余击穿电压。比较了非破坏性参数与剩余击穿电压的相关性 ,提出了表征环氧云母定子线圈老化状态的特征参数  In this paper, the multi stress aging causes of large generator stator insulation is analyzed, the test parameters of each single stress aging are determined, the test model and experimental methods for acquisition and analysis of insulation failure data when fatigue stresses due to vibration are developed with electrical and thermal stresses, and the multi\factor aging test system is designed and installed. It has been verified by the multi stress aging test... In this paper, the multi stress aging causes of large generator stator insulation is analyzed, the test parameters of each single stress aging are determined, the test model and experimental methods for acquisition and analysis of insulation failure data when fatigue stresses due to vibration are developed with electrical and thermal stresses, and the multi\factor aging test system is designed and installed. It has been verified by the multi stress aging test that many parameters, such as partial discharge magnitude, discharge impulse number, discharge energy and so on, tend to increase, and the phase angle at which the maximum number of partial discharge occurs is found to deflect with further aging of insulation. The multi stress aging system provide a basis for study on aging law of large generator insulation, predicting the remaining life of insulation and finding a set of characteristic parameter which can describe the aging condition of insulation.  分析了大型发电机主绝缘多因子老化产生的原因 ,确定了各单因子老化的试验参数 ,建立了多因子老化的试验模型和试验方法 ,设计了多因子老化试验系统。经真机线棒的老化试验验证 ,随着绝缘的进一步老化 ,其局部放电量、放电次数和放电能量等参数均呈现增长趋势 ,放电脉冲相位产生偏移。结果表明 ,该多因子老化试验系统能满足研究大型发电机主绝缘的老化规律和评估其剩余寿命的要求 ,为寻找反映绝缘老化程度的特征参量奠定了基础  Accelerated multi factor aging tests in laboratory have been conducted on the epoxy/mica stator insulation to identify useful diagnostic measures for aging characteristics. In different aging stages, AC current test and breakdown test were performed. Considering the characteristics of AC current curves, a novel point by point fitting algorithm based on Least Mean Square (LMS) criterion is proposed to determine the voltage U pi2 corresponding to the second abrupt increasing... Accelerated multi factor aging tests in laboratory have been conducted on the epoxy/mica stator insulation to identify useful diagnostic measures for aging characteristics. In different aging stages, AC current test and breakdown test were performed. Considering the characteristics of AC current curves, a novel point by point fitting algorithm based on Least Mean Square (LMS) criterion is proposed to determine the voltage U pi2 corresponding to the second abrupt increasing of AC current. Also, the relationship between this voltage and the residual breakdown voltage of insulation is analyzed. It is concluded that with the novel algorithm U pi2 can be accurately calculated, and it is efficient to use U pi2 for evaluating the residual breakdown voltage.  对大型电动机环氧云母绝缘线棒进行了多因子加速老化试验 ,在不同老化阶段进行了交流电流、击穿电压测量。根据交流电流曲线的特点 ,提出了求取第二电流急增点电压的新方法——逐点拟合法 ,并分析了第二电流急增点电压与剩余击穿电压的相关性。结果表明 :逐点拟合法能准确地求取第二电流急增点电压 ,且用此电压值推算环氧云母主绝缘的剩余击穿电压是有效的  
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