荧光光纤温度传感器护套材料在变压器油中的热老化

发布时间：2018-03-04 08:34

本文选题：等温松弛电流　切入点：荧光光纤温度传感器　出处：《高电压技术》2017年08期 　论文类型：期刊论文

【摘要】：荧光光纤温度传感器长期浸没在变压器油中,随着使用时间的增加,其护套材料不可避免地会经历老化过程。通过有限元仿真发现荧光光纤温度传感器及其护套在工作时所处的电场很小,热老化是护套材料老化的主要形式。为此,针对荧光光纤温度传感器的3种不同护套材料即交联聚烯烃、聚氨酯和聚氯乙烯,在不同温度的变压器油中进行了热老化;然后使用Fourier变换红外光谱(Fourier transform infrared spectroscopy,FTIR)对试样的化学结构进行了辅助分析,并且基于机械拉伸实验和使用沿面电极布置形式的等温松弛电流方法,对不同护套材料的老化状态进行了分析评估。红外光谱实验结果表明:交联聚烯烃和聚氨酯护套在变压器油中热老化后均发生一定程度的分解,聚氯乙烯护套的红外光谱在老化前后没有大的变化。机械拉伸实验结果表明:交联聚烯烃护套的断裂伸长率和拉伸强度都大幅下降,聚氨酯护套的断裂伸长率下降但是拉伸强度却增加,而聚氯乙烯护套的断裂伸长率和拉伸强度均没有太大变化。等温松弛电流方法计算结果表明:老化后各种护套的老化因子值均大于未老化护套的值。综合评估可得:交联聚烯烃护套在油中热老化性能最差,聚氨酯护套次之,聚氯乙烯护套性能最好。
[Abstract]:The fluorescent fiber temperature sensor is immersed in transformer oil for a long time. Through finite element simulation, it is found that the electric field of fluorescent fiber temperature sensor and its sheathing is very small, and thermal aging is the main form of sheath material aging. According to three different sheathing materials of fluorescent fiber temperature sensor, crosslinked polyolefin, polyurethane and polyvinyl chloride, thermal aging was carried out in transformer oil at different temperature. Then, the chemical structure of the samples was analyzed by Fourier transform infrared spectroscopy, Fourier transform infrared spectroscope, and based on the mechanical tensile test and the isothermal relaxation current method arranged along the surface electrode. The aging state of different sheathing materials is analyzed and evaluated. The results of infrared spectrum experiment show that both crosslinked polyolefin and polyurethane sheath decompose to a certain extent after thermal aging in transformer oil. The infrared spectrum of PVC sheathing did not change greatly before and after aging. The mechanical tensile test results showed that the elongation at break and tensile strength of crosslinked polyolefin sheathing decreased significantly. The elongation at break of the polyurethane sheath decreases but the tensile strength increases. However, the elongation at break and tensile strength of PVC sheathing have not changed much. The calculation results of isothermal relaxation current method show that the aging factors of all kinds of sheathing after aging are higher than those of unaged sheaths. The results show that crosslinked polyolefin sheaths have the worst thermal aging performance in oil. Polyurethane sheathing followed, PVC sheathing performance is the best.
【作者单位】：国网河北省电力公司电力科学研究院;上海交通大学电气工程系;
【基金】：国家电网公司科技项目(5204HB15001S)~~
【分类号】：TM41;TP212.11

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