Numerical Simulation of Hygroscopic Characteristic and Wet Stress Distribution of GFRP Material Used in High Voltage Composite Insulators
Hou Sizu1,2, Zhong Zheng3, Liu Yunpeng3, Geng Jianghai3
1. Hebei Key Laboratory of Power Internet of Things Technology North China Electric Power University Baoding 071003 China; 2. Baoding Eagle Communication and Automation Co. Ltd Baoding 071003 China; 3. Hebei Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China
Abstract：On the condition of the long-term high temperature and high humidity environment in southern China, external moisture gradually penetrates into the composite insulator core rod, causing the core rod to decay-like deterioration and even the entire insulator to break. Therefore, accurate simulation and analysis of the moisture intrusion process is essential. This paper simulates and calculates the transient hygroscopic diffusion process inside glass fiber reinforced plastic (GFRP) material used in high voltage composite insulators and the change of the wet stress in the material at the external environment temperature of 10℃, 20℃ and 30℃, and the relative humidity of 90%. The results show that the diffusion process of water inside the GFRP material satisfies Fick’s law, and both the hygroscopic diffusion rate and the saturated hygroscopic rate increase with the increase of external environment temperature. In the GFRP material, the wet stress and wet mismatch stress at the densely distributed areas of the fiber distribution and fiber-matrix interface are large, and they are positively correlated with the moisture absorption. When the saturated hygroscopic rate is 0.008%~0.4%, the maximum wet stress inside the material can reach 48.07~66.06MPa. Further analysis shows that when the moisture absorption and dehumidification cycle periodically and the wet stress level is high inside the material, defects such as micro cracks, micro holes, fiber-matrix debonding and cracking are likely to occur, and the moisture absorption of the material is further promoted. The relative error between the calculated value of this paper and the experimental value of the existing literature is within ±5%. The conclusions have important reference value for revealing the decay-like fracture of the composite insulator core rod and improving the service life of composite insulators.
侯思祖, 钟正, 刘云鹏, 耿江海. 高压复合绝缘子用GFRP材料吸湿特性及湿应力分布数值模拟[J]. 电工技术学报, 2022, 37(4): 1010-1019.
Hou Sizu, Zhong Zheng, Liu Yunpeng, Geng Jianghai. Numerical Simulation of Hygroscopic Characteristic and Wet Stress Distribution of GFRP Material Used in High Voltage Composite Insulators. Transactions of China Electrotechnical Society, 2022, 37(4): 1010-1019.
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