特高压换流变压器压力释放阀布置方式  

A Study on the Arrangement of Pressure Relief Devices in UHV Converter Transformers

作　　者：程林 周盟[1,2] 郭家旭 罗传仙 张静 黄勤清[1,2] 闫晨光 CHENG Lin;ZHOU Meng;GUO Jiaxu;LUO Chuanxian;ZHANG Jing;HUANG Qinqing;YAN Chenguang(NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 210061,Jiangsu,China;Wuhan NARI Co.,Ltd.,State Grid Electric Power Research Institute,Wuhan 430074,Hubei,China;School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,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：《电网与清洁能源》2024年第4期44-53,共10页Power System and Clean 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：换流变压器油箱破裂及爆炸起火事故严重威胁电力系统安全稳定运行,压力释放阀在电弧故障期间通过泄放超压保护设备。通过分析故障期间瓦斯气泡脉动机理,建立压力释放阀动作条件、换流变压器内部电弧故障油压升高理论模型及其数值计算方法。以1台实际的500kV特高压换流变压器为研究对象,开展数值仿真研究,得到不同压力释放阀布置方式下的故障油压变化特征。仿真结果表明:换流变压器发生内部电弧故障时,其内部故障油压在空间上分布不均,压力释放阀布置方式对其安装位置附近的压力泄放影响较为明显,而对其余位置超压影响较小;优化换流变压器压力释放阀布置位置可有效降低电弧故障期间油压峰值。The rupture and explosion of the converter transformer oil tank pose a serious threat to the safe and stable operation of the power system while the pressure relief valve protects the equipment by releasing overpressure during an arcing fault.By analyzing the mechanism of gas bubble pulsation during the fault period,a theoretical model and its numerical calculation method for the action conditions of the pressure relief valve,the increase of oil pressure due to internal arcing faults in the converter transformer are established.Simulations are performed on an actual 500 kV ultra-high voltage converter transformer,and characteristics of faulty oil pressure variations under different pressure relief valve arrangements are obtained.The simulation results suggest that when an internal arc fault occurs in the converter transformer,the internal fault oil pressure is unevenly distributed in space;and the arrangement of the pressure relief valves has a more significant impact on the pressure relief in the vicinity of their mounting position and a lesser effect on overpressure in other positions.The simulation results also show that optimizing locations of pressure relief valves in the converter transformer can effectively reduce the peak oil pressure during the arcing fault.

关 键 词：换流变压器 压力释放阀 布置方式 内部电弧故障 数值仿真 

分 类 号：TM411[电气工程—电器]