| 基于局部放电和超声波法研究大电机定子绝缘的老化特性 |
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| 引用本文： | 郝艳捧,王国利,谢恒堃,贾志东. 基于局部放电和超声波法研究大电机定子绝缘的老化特性[J]. 电工技术学报, 2002, 17(2): 1-6 |
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| 作者姓名： | 郝艳捧 王国利 谢恒堃 贾志东 |
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| 作者单位： | 1. 西安交通大学电力设备电气绝缘国家重点实验室,710049
2. 清华大学电机系,100084 |
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| 基金项目： | 国家科学自然科学基金重点资助项目 (5 983 72 60 ) |
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| 摘 要： | 对谏壁电厂 7号机 (18kV ,30 0MW )更换线棒进行了多因子加速老化试验 ,在线棒的不同老化阶段进行了局部放电和超声波声速试验。试验发现 ,局部放电平均值是反映绝缘缺陷最好的参数 ,在局部放电统计参数中 ,放电平均值相位分布的偏斜度最能反映绝缘的老化程度。超声波声速试验的结果显示出 ,超声波声速可以表征发电机定子绝缘老化状态 ;随着线棒老化时间增长 ,其超声波声速明显降低。两项试验结果一致地表明 ,绝缘老化是由于其内部出现了微观缺陷
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| 关 键 词： | 超声 老化特征 局部放电 |
| 修稿时间： | 2001-06-05 |
Study on Aging Characteristics of Generator Stator Insulation Based on Partial Discharge and Ultrasonic Wave Method |
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| Hao Yanpeng Wang Guoli Xie Hengkun. Study on Aging Characteristics of Generator Stator Insulation Based on Partial Discharge and Ultrasonic Wave Method[J]. Transactions of China Electrotechnical Society, 2002, 17(2): 1-6 |
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| Authors: | Hao Yanpeng Wang Guoli Xie Hengkun |
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| Affiliation: | Hao Yanpeng Wang Guoli Xie Hengkun(State Key Laboratory of Electrical insulation for Power Equipment in Xi'an Jiaotong University 710049 China) Jia Zhidong(Tsinghua University 100084 China) |
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| Abstract: | Accelerated multifactor aging tests in laboratory have been conducted on stator insulation of large generator(18kV,300MW) to identify useful diagnostic parameters for insulation aging characteristics Partial discharge parameters and ultrasonic wave velocity are measured for stator insulation of different aging time The experimental results show that in all statistical parameters obtained from the phase distribution of mean partial discharge,the skewness decreases from positive to negative with aging time,and the ultrasonic wave velocity propagated in stator also decreases obviously Ultrasonic wave velocity can be used to describe the aging characteristics of stator insulation The results also examined the insulation defects result in the dielectric properties decreasing of insulation |
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| Keywords: | Ultrasonic aging characteristic partial discharge |
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