基于FDS的电机线棒环氧云母绝缘电老化特性  

Electrical ageing characteristics of epoxy-mica insulation of generator based on FDS

作　　者：陈庆国[1] 单志铎 付强[2,3,4,5] 池明赫 

机构地区：[1]哈尔滨理工大学电介质工程国家重点实验室培育基地,哈尔滨150080 [2]哈尔滨大电机研究所,哈尔滨150040 [3]水力发电设备国家重点实验室,哈尔滨150040 [4]国家水利发电设备工程技术研究中心,哈尔滨150040 [5]哈尔滨电机厂有限责任公司,哈尔滨150040

出　　处：《复合材料学报》2017年第9期1926-1933,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51407051);教育部高等学校博士学科点专项科研基金(20132303110006)

摘　　要：为解决目前大型电机定子线棒主绝缘现场无损检测手段缺乏的问题,本文采用基于介电响应理论的频域介电谱法(Frequency Domain Spectroscopy,FDS),对大型电机定子线棒真空压力浸渍(Vacuum Pressure Impregnating,VPI)少胶云母绝缘进行测试。通过对不同老化时间和温度下线棒电性能参数的对比分析,研究电老化对电机线棒绝缘介电性能的影响规律。结果表明,电老化使环氧云母绝缘材料介电性能下降,其中环氧胶所受影响最为明显,在电老化过程中分子链发生断裂使粘接能力下降,在绝缘结构中形成更多介质分界面,同时使绝缘材料中极性分子活性增强,加剧了界面极化与转向极化,使介损和介电常数随电老化时间增长而增大。In order to solve the problem of absent nondestructive test methods,the frequency domain spectroscopy（FDS）based on dielectric response theory had been used to test Vacuum Pressure Impregnating（VPI）less resin epoxy mica insulation of large generator stator bars.The effect of electrical aging of insulation dielectric properties was studied through comparing and analyzing the dielectric loss and dielectric constant curves in different ageing time and temperature.Result shows that the dielectric properties of epoxy-mica insulation decrease because of electrical aging,especially the epoxy resin.Molecular chain failure leads to the decrease of the bonding ability after the electrical ageing.More medium interfaces appear inside insulation material and the polar molecule activity improves at the same time.Interface polarization and turning-direction polarization are intensified.Dielectric loss and dielectric constant increase with electrical aging time.

关 键 词：电老化 频域介电谱 定子线棒主绝缘 少胶模压 环氧云母复合绝缘 

分 类 号：TB332[一般工业技术—材料科学与工程]