定子端部手包绝缘表面电位测量的电路分析与试验要点  

Analysis of Equivalent Circuit and Test Cruces of Measuring Surface Potential on Hand-making Insulation at End-winding of TurboGenerator Stator

作　　者：吴影[1] 梅志刚[1] 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045

出　　处：《华北电力技术》2008年第10期25-27,共3页North China Electric Power

摘　　要：通过对稳态简化电路的分析,导出了表面电位与体积电阻、表面电阻和测量仪表内阻之间的函数关系,明确了测量原理;通过对暂态简化电路的分析,导出了表面电位与时间之间的函数关系,指出了测量仪表内阻对表面电位的影响方式。分析结果表明,应采用数值统一且数值适中的测量仪表内阻,便于快速获取稳态读数,统一判据;应在端部清扫后进行试验;铝箔包紧的程度对试验结果影响不大;定子是否通水并不影响试验结果。Through analysis of a steady--state predigested equivalent circuit, a function between the surface potential and the volume resistance, the surface resistance of the insulation, the internal resistance of measuring equipment is presented, thus the test principle is more straightforward; through analysis of a transient equivalent circuit, a function of the surface potential and time is present, which implies how the internal resistance of measuring equipment affects the surface potential. The analysis results indicate that the numerical value of the internal resistance of measuring equipment must be moderate and uniform, with which test results will be displayed more quickly and the judge standard will be uniform. The analysis results also indicate that the test must be carried out after the clearing of end-winding. The degree of tightness of enwrapping aluminum foil around the hand-making insulation does not affect the test results much. Whether stator windings-pass cooling water does not affect the test results.

关 键 词：汽轮发电机 端部手包绝缘 表面电位 

分 类 号：TM311[电气工程—电机]