发电机定子绕组端部表面电晕分析及处理.pdf

2016年第8期
水电与新能源
总第146期
2016 Number 8
HYDROPOWER AND NEW ENERGY
Total No. 146
D0O:10.1.3622/j.cnki.cm42-1800/Iv.1671-3354.2016.08.013
发电机定子绕组端部表面电晕分析及处理
郭钰静,赵鲲,张昆
(中国长江电力股份有限公司检修厂,湖北宜昌43002)
摘要:介绍了发电机定子绕纽端部的防晕的目的和结构,根据电晕放电理论结合现场实际重点分析了端部电晕产生的4
种原因:绕纽所处的电位、低阻区和高阻区搭接不良、上下层绕组间距过小以及表面脏污。依据《发电机定子绕纽端部电
晕检测与评定导则》的试验方法,对电旱进行判定,提出了暗室目测法和紫外电旱法存在位置判定不准的缺点,明确了现
场痕迹的确定应以停机检査为主。在现场分别采用了4种不同的电晕修复处理方法:涂刷绝缘漆、凃刷两遍高阻防晕漆
及绝缘漆、上下层线棒间填充适形的绝缘材料以及局部防晕层重做,得出了在现场可以处理发电机端部电晕放电的结
论,确保了电机的安全运行
关键词:发电机;电晕放电;防晕层处理
中图分类号:TYM303.3:TM307
文献标志码:B文章编号:1671-3354(2016)08-(0044-05
Analysis and Treatment of the Corona Defects on
Generator Stator Winding Overhangs
GUO Yujing, ZHAO Kun, ZHANG Kur
(Overhaul and Maintenance Factory, China Yangtze Power Co, Ltd, Yichang 443002, China)
Abstract The purpose of the corona prevention on generator stator winding overhangs and the anti orona structure are
introuced. According to the corona theory and the field experience, four possible reasons of the corona defects are dis
ussed including the electrical potential of the windings, unsatisfactory connection between the high and low resistance
zones, excessively small gap between the top and bottom windings, and the surface dirt. It also shows that the darkroom
visual inspection method and the ultraviolet corona detection method in the national standard are not accurate enough to
locate the corona. While the shutdown checking is recommended. In addition, four different repairing methods for the
corona defects are successfully adopted, including the coating with insulation paint, coating with two layers of the high
resistance anti-eorona paint and then insulation paint, insulation material filling between the top and bottom winding
bars, and recoating of the anticorona paint in local areas. With these treatment measures, the safe operation of the
enerator is ensured
Key words: generator; corona; anticorona treatment
防电晕是高乐电机定子绕组绝缘必须解决的一个设计制造的机型,定子绕组为3相9分支双层波绕组
问题,因为如果高压定子绕组(线圈)不做防晕处理或接线,正常运行额定电压为13.8kV,是国内环氧粉云
处理不好,则绕组制造时的多次耐电斥试验可能无法毋绝缘的早期应用典型,由于当时采用的防电晕材料
通过;另外定子绕组在运行时公处于严重的电晕状态附着性差,电阻值不稳定,加上对环氧粉云母绝缘防电
下,甚至处于火花放电状态下,极大的影响电机的安全晕的特性认识不足,导致多台早期使用环氧粉云母绝
运行
缘的发电机定子端部发生不同程度的电晕和电腐蚀现
某水力发电厂的水轮发电机组属上世纪80年代象,使电机不得不修理
收稿日期:2016-07-04
作者简介:郭钰静,女,工程师,从事电气一次设备的检修、试验及维护工作