换流变压器内部电弧故障超压仿真研究  

Numerical study on overpressure caused by arcing faults inside a converter transformer

作　　者：周盟 罗传仙 郭家旭[3] 周正钦 张芃 闫晨光 ZHOU Meng;LUO Chuanxian;GUO Jiaxu;ZHOU Zhengqin;ZHANG Peng;YAN Chenguang(NARI Group Corporation/State Grid Electric Power Research Institute,Nanjing 210061,China;Wuhan NARI Co.,Ltd.,State Grid Electric Power Research Institute,Wuhan 430074,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]南瑞集团(国网电力科学研究院)有限公司,江苏南京210061 [2]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074 [3]西安交通大学电气工程学院,陕西西安710049

出　　处：《电工电能新技术》2024年第5期68-75,共8页Advanced Technology of Electrical Engineering and Energy

基　　金：国家电网有限公司总部管理科技项目(5500-202055419A-0-0-00)。

摘　　要：换流变压器内部电弧故障将引起油箱内部油压骤升,可能导致油箱破裂甚至严重的爆炸起火事故,严重威胁电力系统安全稳定运行。本文以实际的500 kV特高压换流变压器为研究对象,基于ANSYS平台进行多场耦合数值仿真计算,得到不同故障条件下换流变压器内部超压的时空分布特征。仿真结果表明,设备内部电弧故障期间瓦斯气泡动态增长,油压随瓦斯气泡脉动而骤升并表现出明显的波动特征,换流变压器本体内部油压空间分布不均。本项研究对于换流变压器减压防爆、结构优化具有一定的参考意义。The arcing fault inside a converter transformer will result in a sudden rise of oil pressure inside the tank,which may lead to tank rupture or even serious explosion and fire,seriously threatening the safe and stable operation of the power system.This paper takes the actual 500 kV UHV converter transformer as the research object,and carries out numerical simulations on the ANSYS platform to obtain the spatial and temporal distribution characteristics of the oil pressure inside the converter transformer during the arcing fault.The simulation results show that the gas bubble grows dynamically during the arcing fault inside the equipment,the oil pressure rises abruptly with the pulsation of the gas bubbles and shows obvious fluctuation characteristics,and the spatial distribution of oil pressure inside the converter transformer is uneven.This study has certain reference significance for the converter transformer pressure reduction and explosion-proof and structure optimization.

关 键 词：换流变压器 内部电弧故障 超压 数值仿真 

分 类 号：TM772[电气工程—电力系统及自动化]