基于FDS的电机线棒环氧云母绝缘电老化特性

发布时间：2018-10-22 20:40

【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。
[Abstract]:In order to solve the problem of lack of nondestructive testing methods for main insulation of stator bar of large motor at present, In this paper, a frequency domain dielectric spectrum method (Frequency Domain Spectroscopy,FDS) based on dielectric response theory is used to test the vacuum pressure impregnation of large motor stator bar with vacuum pressure (Vacuum Pressure Impregnating,VPI) with less rubber mica insulation. By comparing and analyzing the electrical properties of wire rod at different aging time and temperature, the effect of electric aging on dielectric properties of wire rod insulation is studied. The results show that the dielectric properties of epoxy mica insulation materials are decreased by electric aging, and the epoxy adhesive is the most obviously affected. In the process of electrical aging, the molecular chain breaks and the adhesion ability decreases, and more dielectric interfaces are formed in the insulation structure. At the same time, the polar molecular activity in the insulating material is enhanced, the interfacial polarization and the turning polarization are aggravated, and the dielectric loss and dielectric constant increase with the increase of the aging time.
【作者单位】：哈尔滨理工大学电介质工程国家重点实验室培育基地;哈尔滨大电机研究所;水力发电设备国家重点实验室;国家水利发电设备工程技术研究中心;哈尔滨电机厂有限责任公司;
【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)
【分类号】：TM303.3

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