基于局部放电的矩特征分析大电机主绝缘的老化  

ANALYSIS ON AGING CONDITION OF STATOR WINDING INSULATION OF GENERATOR BASED ON THE MOMENT CHARACTERISTICS OF PARTIAL DISCHARGE

作　　者：张晓虹[1,2] 张亮[1] 乐波[1] 谢恒堃[1] 

机构地区：[1]西安交通大学电气绝缘国家重点试验室 [2]哈尔滨理工大学,黑龙江哈尔滨150040

出　　处：《中国电机工程学报》2002年第5期94-98,共5页Proceedings of the CSEE

基　　金：国家自然科学基金重点项目(59837260)。

摘　　要：分析了大电机主绝缘老化的机理,系统研究了在不同老化因子作用下局部放电分布图中统计参数偏斜度Sk和峭度Ku随老化时间的变化规律,发现放电量的相位分布图(φ-q)中Sk值由正变为负的过程可用于对大电机主绝缘的老化状态进行诊断。试验中还发现,(φ-n)分布图中最大放电次数出现的相位角位置, 在未老化试样中是在45°和135左右,老化一个阶段以后变化为接近于0°和180°,最后变化至约90°和270°。这个过程可作为评估大电机主绝缘老化状态的重要依据。The aging mechanism of stator winding insulation of large generator is analyzed. In this paper, the dependences of skewness and kurtosis in the profile of φ-q and φ-n characteristic on aging time are investigated by means of PD measurement on model bars subjected different stresses. The skewness in the profile of φ-q characteristic changes from positive to negative with aging time, which can be considered as a reference of aging course in stator winding insulation of large generator. A new phenomena is found that the maximum number of PD pulse in the profile ofφ-n appear to be at 45°and 135°in unaged specimen, at 0°and 180°in mid-aged specimen, at 90°and 270°in high-aged specimen, which is a important information to realize aging condition in stator winding insulation of large generator.

关 键 词：局部放电 矩特征分析 大电机 主绝缘 老化 

分 类 号：TM31[电气工程—电机]