基于频域介电响应法的环氧胶浸纸芯体受潮状态分析研究

doi:10.11896/cldb.24090087

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Abstract Epoxy resin-impregnated paper bushings are widely utilized in high-voltage equipment such as transformers, where their insulation perfor-mance is crucial for safe operation. During actual operation, the crepe paper within the resin-impregnated paper core is prone to moisture absorption during production and operation, leading to a decline in its insulation properties and subsequently affecting the reliability of bushing performance. This study established a frequency-domain dielectric response test platform for resin-impregnated paper cores and conducted research on the frequency-domain dielectric response detection of cores under various moisture conditions. The results indicate that the dielectric response of the core within the low-frequency range (0.001 Hz to 0.1 Hz) is highly sensitive to moisture content, and the dielectric characteristics under different moisture states exhibit significant differences within this frequency band. Notably, at the characteristic frequency of 0.046 Hz, the dielectric loss of an extremely moist resin-impregnated paper core surged approximately tenfold compared to a normal core, highlighting the sensitivity of frequency-domain dielectric response detection to moisture defects in the low-frequency range. The evolution trend of moisture defects in resin-impregnated paper cores under natural moisture conditions was investigated, confirming the limitations and deficiencies of power frequency dielectric loss in early moisture detection of such cores. It was discovered that the low-frequency dielectric characteristics in the early stages of moisture absorption can effectively predict potential defects, with a significantly higher warning sensitivity than power frequency measurements. The dielectric loss values of resin-impregnated paper cores with varying degrees of moisture at the characteristic frequency of 1 Hz were extracted and subjected to fitting analysis. A fitting curve for moisture assessment of resin-impregnated paper cores was obtained, and an evaluation method for early moisture defects in such cores was proposed. This study provides a reliable method and basis for the moisture assessment of in-service resin-impregnated paper bushings, contributing to enhanced maintenance practices and ensuring their safe and stable operation.

Key words： resin-impregnated paper bushing frequency domain spectroscopy moisture absorption epoxy resin-impregnated paper

Published: 10 November 2025 Online: 2025-11-10

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TM855

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	Articles by authors
	QIAO Yajun
	LIU Yun
	PAN Huan
	HU Tao
	ZHOU Fusheng

Cite this article:

QIAO Yajun,LIU Yun,PAN Huan, et al. Analysis of Moisture Condition in Epoxy Resin Impregnated Paper Core Using Frequency Domain Dielectric Response Method[J]. Materials Reports, 2025, 39(21): 24090087-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24090087 OR https://www.mater-rep.com/EN/Y2025/V39/I21/24090087

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