大型水内冷水轮发电机绝缘测量失真研究

Study of Insulation Measurement Distortion in Large Internal Water Cooled Generator

大型水内冷水轮发电机绝缘参数测量经常会遇到各种各样的问题。本文分析了水内冷水轮发电机纯水引水钢管对定子机座绝缘不良会造成定子绕组绝缘参数测量严重失真的原因,提出了将引水钢管与汇水环管短接以便降低引水钢管绝缘要求的改进方案。经试验验证和三峡电站的实践,说明此方案合理、有效、可靠、方便,具有推广价值。

Large internal water cooled generator often faces various problems. This paper analyzes the reason of the measurement distortion in the stator winding insulation which caused by bad insulation between water cooled generator stator's water diversion pipe and stator frame. And the scheme of connecting the diversion steel pipe and catchment ring pipe to reduce insulation requirement of the diversion steel pipe has been proposed. By test and practice of the Three Gorges Power Station, we have proved that this scheme is reasonable, efficient, reliable, convenient, and worth to spread.