Analysis of Moisture Condition in Epoxy Resin Impregnated Paper Core Using Frequency Domain Dielectric Response Method
QIAO Yajun1,*, LIU Yun1, PAN Huan1, HU Tao1, ZHOU Fusheng2,3
1 Guangzhou Power Supply Bureau Substation Management Section Three, Guangzhou 511449, China 2 Electric Power Research Institute, China Southern Power Grid, Guangzhou 510530, China 3 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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.
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2025, Vol. 39 
