Electrical Aging Characteristics of VPI Main Insulation of Large Generator Based on Thermally Stimulated Current

FU Qiang; SONG Yang; CHEN Qingguo; SHAN Zhiduo

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Electrical Aging Characteristics of VPI Main Insulation of Large Generator Based on Thermally Stimulated Current

更新时间：2025-12-08

- Electrical Aging Characteristics of VPI Main Insulation of Large Generator Based on Thermally Stimulated Current
- Vol. 47, Issue 5, Pages: 1780-1787(2021)
- 作者机构：
  
  1. 哈尔滨大电机研究所
  2. 水力发电设备国家重点实验室
  3. 国家水力发电设备工程技术研究中心
  4. 哈尔滨电机厂有限责任公司
  5. 哈尔滨理工大学电介质工程国家重点实验室培育基地
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 May 2021，
  
  Published：2021
- 稿件说明：
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FU Qiang, SONG Yang, CHEN Qingguo, et al. Electrical Aging Characteristics of VPI Main Insulation of Large Generator Based on Thermally Stimulated Current[J]. 2021, 47(5): 1780-1787.
DOI：

FU Qiang, SONG Yang, CHEN Qingguo, et al. Electrical Aging Characteristics of VPI Main Insulation of Large Generator Based on Thermally Stimulated Current[J]. 2021, 47(5): 1780-1787. DOI：

摘要

为了研究大型发电机定子线棒主绝缘在不同电老化阶段的老化机理

利用热刺激电流（thermally stimulated current

TSC）法对少胶真空压力浸渍（vacuum pressure impregnating

VPI）定子线棒绝缘进行研究。主要分析了VPI绝缘TSC峰的形成机理

计算了不同TSC峰的特征参数

利用傅里叶红外光谱（Fouriertransforminfraredspectroscopy

FTIR）分析了绝缘材料含有的胶黏剂的基团变化

利用扫描电镜（scanningelectronmicroscopa

SEM）观测了微观状态下材料形貌变化。试验结果表明:在所测–40～120℃区间内

VPI绝缘TSC谱为1条由转向极化和界面极化引起的双峰曲线

峰值温度分别在–5℃和70℃附近。随着电老化时间的增加

转向极化峰活化能略有下降

界面极化峰活化能明显上升

各峰曲线幅值及释放电荷量均有不同程度的增加。因此该研究结果为利用TSC法分析定子线棒主绝缘老化机理奠定了基础。

Abstract

In order to study the electrical aging characteristics of main insulation of large generator stator bar

the thermally stimulated current（TSC） was used to research the main insulation properties of vacuum pressure impregnating（VPI）

the formation mechanism of TSC peak was analyzed

and the characteristic parameters of the TSC peak were calculated. Fourier transform infrared spectroscopy（FTIR） was used to analyze the group changes of the adhesive contained in the insulating material

and scanning electron microscopy（SEM） was used to observe the changes in material morphology in the microscopic state. The test results show that the TSC spectrum of VPI main insulation is a double-peak curve caused by turning polarization and interface polarization in measured range of -40～120 ℃

and the peak temperatures are at around -5 ℃ and 70 ℃. With the increase of electrical aging time

the activation energy of turning polarization peak decreases slightly

the interface polarization peak increases obviously

and the amplitude and release charge of each peak curve increase to different degrees. The results of this study lay the foundation for analyzing the aging mechanism of the main insulation of stator bar by using the TSC method.

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