【摘要】 研究了不同运行年数的大电机定子线棒的介电参量和局部放电参量,分析了这些参量随运行年数的变化关系。研究发现:随线棒运行时间的增加,电容参量、最大放电量、平均放电量呈明显增大的趋势,而统计分布参量偏斜度和峭度呈下降的趋势,起始放电脉冲的相位越来越接近0°和180°,放电脉冲的相位分布越来越宽,由一三象限向二四象限扩展。这些参量能够有效表征大电机主绝缘的老化状态,对大电机主绝缘的状态评估和剩余寿命预测有重要作用。更多还原

【Abstract】 Dielectric dissipation parameters and partial discharge parameters of stator bars with different operating years in large generator were studied in this paper. It was found that, with the increase of bars operating years, capacitance parameter, maximum discharge magnitude, average discharge magnitude show obviously incremental trends, and statistic distribution parameters-skewness and kurtosis decrease. Moreover, phase distributions of initiative discharge pulse are close to 0° and 180° gradually, phase distributions of discharge pulse become wider and wider, and extend from the first and third quadrants to the second and fourth ones. These parameters could effectively characterize the aging condition of stator winding insulation in large generator. The study had important effects on estimating condition and predicting residual life of stator winding insulation in large generator.更多还原