高电压技术2023，Vol.49Issue(12)：5302-5311,10.DOI:10.13336/j.1003-6520.hve.20230308
磁环抑制变电站二次电缆瞬态电磁骚扰模拟试验及分析
Analysis and Simulation Test on Suppressing Transient Electromagnetic Disturbance of Secondary Cable in Substation with Magnetic Rings
薛宇航 1张卫东 1刘忠禄 1倪辉阳 1董志伟 1杨松1
作者信息
- 1. 华北电力大学新能源电力系统国家重点实验室,北京 102206
- 折叠
摘要
Abstract
In contemporary substations,intelligent secondary equipment plays a crucial role,with many electrical pa-rameters required for its operation introduced through secondary cables.Secondary cables are mostly located in the switching field,making them susceptible to strong transient electromagnetic disturbances.To investigate the suppression effects and the influencing factors of added magnetic rings on secondary disturbance voltage,a laboratory simulation in-jection test platform and a substation injection test platform were constructed,with the experimental studies conducted on two different cable scales.Using the injection methods,electrical fast transient burst and damping oscillatory waves were injected separately at the cable initiation end(switching field)through a capacitive coupling as the excitation source.We measured the ground-to-core common-mode voltage at the cable terminal(protective chamber)and explored the influence of factors such as magnetic ring string length,installation position,and materials on the suppression effect.Subsequently,an equivalent circuit model of the test platform was established,and the impact of installation position was analyzed by using the transmission line theory.The research findings indicate that the suppression effect with the magnetic ring string increasing has a rising trend.However,the increase rate of the suppression effect slows down after the magnetic ring string is increased to a certain length;to enhance the suppression effect,the selection of magnetic ring materials should adhere to principles such as appropriate high magnetic permeability,high impedance loss,favorable high-frequency char-acteristics,and large saturation magnetic flux density;installing magnetic rings at the end of the protection chamber can suppress the disturbance voltage,whereas installing them at the end of the switching field will increase the core wire voltage at the protection chamber end.It is also revealed that the optimal installation position is closely related to the ac-tual cable routing.The research results can be applied to the protection of secondary cable disturbance voltage in substations,enhancing the reliability of secondary equipment and sensitive circuits.关键词
二次电缆/磁环/瞬态骚扰抑制/注入法/模拟试验平台Key words
secondary cable/magnetic ring/transient disturbance suppression/injection method/simulation test platform引用本文复制引用
薛宇航,张卫东,刘忠禄,倪辉阳,董志伟,杨松..磁环抑制变电站二次电缆瞬态电磁骚扰模拟试验及分析[J].高电压技术,2023,49(12):5302-5311,10.
