变压器故障特征气体监测点位布置研究  

Research on Arrangement of Monitoring Points for Transformer Fault Characteristic Gases

作　　者：刘睿 王杰 余智超 郭裕钧 LIU Rui;WANG Jie;YU Zhi-chao;GUO Yu-jun(State Grid Sichuan Electric Power Company Electric Power Research Institute,Chengdu 610072,China;School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都3610072 [2]西南交通大学电气工程学院,四川成都611756

出　　处：《变压器》2023年第4期27-33,共7页Transformer

基　　金：国家电网有限公司科技项目(52199920002S)。

摘　　要：油浸式变压器在发生故障时,内部会产生多种气体,气体的成分和浓度反映故障类型和故障严重程度。本文作者基于分子动力学建立了气体在绝缘油中的扩散模型,计算了不同温度下变压器内部典型故障气体在绝缘油中的扩散系数,并建立了变压器二维模型,对变压器内部不同位置发生故障时的气体扩散规律进行仿真分析,通过对监测点处的气体浓度进行对比,分析出了最佳的气体监测点,得出七种故障特征气体的扩散系数排序、气体的扩散系数随温度的增大呈指数型增长、监测点位应该布置在油流出口附近以及绕组垂直方向的变压器顶部和底部位置等结论。When a fault occurs in an oil-immersed transformer,a variety of gases are generated inside the transformer,and the composition and concentration of the gases are closely related to the type and severity of the fault.In this paper,a model of gas diffusion in insulating oil is developed based on molecular dynamics,and the diffusion coefficients of typical fault gases in insulating oil are calculated for different temperatures inside the transformer.Then a two-dimensional model of the transformer interior is established and the temperature and flow field distribution inside the transformer is analysed.Finally,the gas distribution at different locations inside the transformer when fault gas production occurs is simulated,the gas diffusion law is summarised,the gas concentration at the monitoring points set up is analysed and the most efficient monitoring point is selected.The results show that the diffusion coefficient of hydrogen is much greater than that of other fault gases,and the selection of monitoring points when hydrogen is generated at different locations provides new ideas for online monitoring of faults inside transformers.

关 键 词：油浸式变压器 扩散系数 气体扩散规律 监测点位布置 

分 类 号：TM411[电气工程—电器]