油浸式电力变压器内部游离气体运动汇集规律  

Pattern of Gas Movement and Convergence in Oil-immersed Power Transformer

作　　者：李博宇 郝治国[1] 李斯盟 郑玉平 薛众鑫 熊军辉 LI Boyu;HAO Zhiguo;LI Simeng;ZHENG Yuping;XUE Zhongxin;XIONG Junhui(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi Province,China;State Grid Electric Power Research Institute,Nanjing 211106,Jiangsu Province,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]国网电力科学研究院有限公司,江苏省南京市211106

出　　处：《中国电机工程学报》2024年第21期8673-8682,I0029,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金项目(52007148);国家电网有限公司科技项目(5100-202340030A-1-1-ZN)。

摘　　要：轻瓦斯保护可靠性不足等问题突出,现阶段大多数轻瓦斯保护装置仅发出报警信号而不投跳闸。而近年来国内发生的多起变压器燃爆事故中,轻瓦斯保护均在事故前发出报警信号,这表明其性能具有一定的优越性。因此,对于变压器内部游离气体特性的研究具有重要意义。为分析油浸式变压器内部游离气体运动和汇聚规律,该文设计一个与实际变压器具有相似结构的模型试验箱体,开展典型绝缘缺陷在发展演化过程中的产气试验。基于ANSYS仿真软件,建立相应的气液两相流模型,对典型绝缘缺陷发展演化过程的不同阶段进行仿真分析。试验数据与仿真结果有良好的一致性,结果表明,随着绝缘缺陷的发展,游离气体从缺陷处转移到箱体内各类结构的表面;气体生成速率随着时间的推移而逐渐增加,在此期间气体呈现不同的运动模式并发生形态变化。基于相同理论模型对真型变压器内部气体行为进行仿真分析,得到其附着汇集规律。结果可为开发新型轻瓦斯保护装置提供有益参考。As the main protection for transformers,gas accumulation relay has problems such as protection malfunction and refusal-operation.Therefore,at present,most transformers are equipped with gas accumulation relay that only emits alarm signals without tripping.In several transformer explosion accidents occurred in recent years,the gas accumulation relay has issued alarm signals before the accident,indicating that the gas accumulation relay has certain advantages compared to other traditional protections.Therefore,the research on the characteristics of free gas inside transformers is of great significance.In order to analyze the pattern of gas movement and convergence inside oil-immersed transformer,an experimental tank with physical structure resembling that of a power transformer is set up,the corresponding two-phase flow model is established in ANSYS,and simulations of different developing stages throughout the oil-paper insulation breakdown process is conducted.Experiments confirm with simulation results,indicating that as a fault develops,gas transfers from the place where the fault occurs,to the upper surface of different structures within the tank;the gas generation rate increases throughout time,during which gas exhibits different moving patterns and undergo morphological changes.Based on the same theoretical model,simulation analysis is conducted on the internal gas behavior of the transformer,and its convergence pattern is obtained.This article provides a useful reference for the development of the novel gas protection device.

关 键 词：油浸式变压器 轻瓦斯保护 游离气体 油纸绝缘击穿 两相流仿真 

分 类 号：TM411[电气工程—电器]