Moisture Evaluation and Influencing Factors of Epoxy Resin Based on Frequency Domain Spectroscopy

DING Ning; MU Haibao; DING Qingpeng; YAO Bowen; ZHANG Daning; ZHANG Guanjun

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Moisture Evaluation and Influencing Factors of Epoxy Resin Based on Frequency Domain Spectroscopy

更新时间：2025-12-08

- Moisture Evaluation and Influencing Factors of Epoxy Resin Based on Frequency Domain Spectroscopy
- Vol. 48, Issue 2, Pages: 706-715(2022)
- 作者机构：
  
  1. 西安交通大学电气工程学院电力设备电气绝缘国家重点实验室
  2. 国网山东省电力公司济宁供电公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：28 February 2022，
  
  Published：2022
- 稿件说明：
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DING Ning, MU Haibao, DING Qingpeng, et al. Moisture Evaluation and Influencing Factors of Epoxy Resin Based on Frequency Domain Spectroscopy[J]. 2022, 48(2): 706-715.
DOI：

DING Ning, MU Haibao, DING Qingpeng, et al. Moisture Evaluation and Influencing Factors of Epoxy Resin Based on Frequency Domain Spectroscopy[J]. 2022, 48(2): 706-715. DOI：

摘要

环氧树脂及氧化铝/环氧树脂复合材料被广泛应用于电力设备绝缘，然而由于羟基等亲水性基团的存在，环氧树脂易吸湿并引起绝缘劣化。为了实现利用频域介电谱法评估两种绝缘的受潮缺陷，在考虑了温度和电压对频域介电谱(FDS)曲线影响的基础上，研究了不同水分含量下环氧树脂频域介电谱特性。结果表明：随温度的升高，介电谱曲线高频段由于反应活化能较大而向右平移程度较大，而低频段则较小。由此提出了一种分段拟合的方法可减小高低频活化能不同所带来的评估误差；激励电压基本不影响介电谱曲线的高频段，对低频段的影响存在3个区域(稳定区、限制区、饱和区)，介损值在限制区随电压的增大而逐渐减小。水分减少时，纯环氧树脂介电谱曲线低频段幅值显著降低，而氧化铝/环氧树脂曲线幅值则在整个频带内均减小。通过对比发现，水分对于两种绝缘介损值的影响均在0.01 Hz处最大，故此频点可作为诊断两种绝缘受潮缺陷的特征频率。

Abstract

Epoxy resin and alumina/epoxy resin composite materials are widely used in electrical equipment insulation.However

due to the existence of hydrophilic groups such as hydroxyl groups

epoxy resin is easy to absorb moisture and cause insulation deterioration. In this paper

considering the influence of temperature and voltage on the frequency domain spectrum（FDS） curve is taken into consideration

and the FDS characteristics of epoxy resin under different moisture content are studied. The results show that the shift degree of the FDS curve is larger in the high frequency band with the increase of temperature while smaller in the low frequency band. Therefore

a piecewise fitting method is proposed to reduce the evaluation error caused by different high and low frequency activation energy. The voltage basically does not affect the high frequency range of the FDS curve. The influence of voltage on the low frequency band has three areas（stable area

restricted area

saturation area）

and the dielectric loss value in the restricted area gradually decreases with the increase of voltage. When the moisture decreases

the low-frequency amplitude of the FDS curve of pure epoxy resin decreases significantly

while the amplitude of the alumina/epoxy resin curve decreases in the entire frequency band.The influence of moisture on the tanδ of the two types of insulation is the most remarkable at 0.01 Hz

thus this frequency can be used as the characteristic frequency for diagnosing the damp defects.

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