油中绝缘纸和铝箔对局放超声信号传播的影响
Influence of Insulating Paper and Aluminum Foil in Transformer Oil on Ultrasonic Signal Propagation in Local Discharge
摘要: 变压器套管是变压器的重要附件。油纸绝缘型套管中的电容芯子由多层绝缘纸和铝箔紧密缠绕所制，该结构对局放超声信号的传播存在一定影响，因而分析油中绝缘纸和铝箔对局放超声信号参数传播的影响可以为利用光纤EFPI传感器对套管内部局放检测提供理论基础。本文采用有限元分析方法，对油中局放超声信号经过铝箔传播的二维模型进行仿真，并搭建了EFPI光纤局放检测系统，对局放超声信号经过铝箔，绝缘纸以及绝缘纸和铝箔组合时所产生的衰减进行了量化分析，将试验结果及实际套管尺寸进行对比分析，验证了利用光纤EFPI传感器对套管进行局放监测的可行性。
Abstract: Transformer bushing is an important accessory of transformer. Oiled paper type insulation casing internal capacitor core is made up of multilayer insulation paper and aluminum foil winding structure of the game with the spread of ultrasonic signal. Therefore, the analysis of the influence of insulating paper and aluminum foil in oil on the transmission of ultrasonic signal parameters can provide a theoretical basis for using fiber EFPI sensor to detect the local discharge in the casing. In this paper, the finite element analysis method is used to simulate the two-dimensional model of ultrasonic signal propagation through aluminum foil. At the same time, the EFPI optical fiber local discharge detection system was built, and the attenuation of local discharge ultrasonic signal through aluminum foil, insulating paper and the combination of insulating paper and aluminum foil was quantitatively analyzed. Finally, the feasibility of using fiber optic EFPI sensor to monitor casing local discharge is verified by comparing the test results with the actual casing size.
文章引用：韩世杰, 谢虎波, 任文军, 郑小康, 陈忠贤, 王伟. 油中绝缘纸和铝箔对局放超声信号传播的影响[J]. 智能电网, 2021, 11(5): 334-343. https://doi.org/10.12677/SG.2021.115032

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