三峡水电站发电机定子绕组绝缘测量分析与实践

大型水内冷发电机定子绕组绝缘参数的精确测量，一直是一个难题。通过对三峡ALSTOM水内冷发电机定子绕组绝缘参数测量的分析与实践，论述了提高定子绝缘参数测量精度的几个方法。如采用专用兆欧表、加厚汇水环管的绝缘法兰、减小测量元件的内阻、平衡电桥法等。

Measurement Analysis and Practice of Insulation of Generator Stator Windings on Three Gorges Hydropower Station

The accurate measurement of large sized, especially the super large internal water cooling generator windings insulation has been a tough job. By the analysis and execution of insulation measurement for the windings of the ALSTOM internal water cooling generator stators, the paper gives an amount of a number of methods for increasing accuracy of measurement of stator insulation, for example, the application of special megametre, increasing thickness of the insulation flange of water collecting loop pipe to reduce internal resistance of the measuring elements and balancing electric bridge.