摘要
为保证特高压直流输电系统安全稳定运行,工程中常在高压直流线路上安装带串联间隙线路避雷器(externally gapped line arrester,EGLA),当线路遭受较强雷击时EGLA的串联间隙被击穿,雷电流通过本体SVU泄放,雷电流过后EGLA需及时、可靠切断续流,恢复高阻状态。因此对EGLA续流特性和动作负荷特性的研究关系到EGLA参数设计和选型配置,具有重要工程意义。但目前鉴于缺乏超、特高压大容量续流实验平台,因此相关研究较少,导致SVU参数确定缺乏依据。文中基于山西晋北—江苏南京±800 kV特高压直流输电线路,利用控制变量的方法仿真研究不同雷击方式、线路位置、输送容量下EGLA的续流特性和动作负荷特性,得出了相较于雷击杆塔反击,雷电绕击时EGLA续流峰值较小但吸收能量更大、输送容量的影响更明显以及雷电绕击线路中部杆塔时EGLA吸收能量最大、续流更小的结论。
For assuring safe and stable operation of UHVDC transmission system,externally gapped line arrester(EGLA)is often installed on UHVDC lines in projects.In case of strong lightning of the line,the series gap of EGLA is broken down and the lightning flows through the SVU.After lightning flows,EGLA needs switching off the continuous current in time and reliably and restoring the high resistance state.Therefore,the study on the continuous current and operating load characteristics of EGLA is related to the parameter design and type selection of EGLA,which has important engineering significance.However,due to the lack of extra-high voltage and ultra-high voltage and high power continuous current experimental platform,the relevant research is therefore less,resulting in the lack of basis for determining SVU parameters.Based on the±800 kV UHVDC transmission line from northern Shanxi to Nanjing in Jiangsu province,the method of control variables is used in this paper to simulate and study the characteristics of EGLA under different lightning strike modes,line positions and transmission capacity.It is concluded that compared with the lightning counterattack on the tower,the peak value of EGLA under lightning shielding failure is smaller but the absorbed energy is larger and the influence of transmission capacity is more obvious.The absorbed energy of EGLA is the largest and the continuous current is smaller in case of the lightning shielding failure on the middle tower of the line.
作者
王致远
韩飞
郭洁
康超
张宗扬
WANG Zhiyuan;HAN Fei;GUO Jie;KANG Chao;ZHANG Zongyang(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Siemens Surge Arrester(Wuxi)Co.,Ltd.,Jiangsu Wuxi 214028,China)
出处
《高压电器》
北大核心
2025年第12期162-167,共6页
High Voltage Apparatus
关键词
带串联间隙线路避雷器
SVU
续流
吸收能量
externally gapped line arrester(EGLA)
SVU
continuous current
absorbing energy
