CAJ | 학술논문

研究特高压变电站保护与控制设备的电磁兼容问题对于确保特高压电网的可靠稳定运行具有重要意义.为此,将矩量法与Fourier变换技术相结合,研究了雷击特高压变电站时保护小室区域的瞬态电、磁场分布,以及在双端接地二次电缆上产生的屏蔽层电流和芯线共模干扰电压.预测计算表明:保护小室区域的最大瞬态磁场强度约为2285 A/m,建议在保护小室墙体铺设金属屏蔽网以满足特高压变电站保护与控制设备的脉冲磁场抗扰度5级的要求;由于雷电流作用时间极短,再加上电缆沟内多根电缆和并联铜排的分流作用,不会导致二次电缆的烧毁;二次电缆的芯线共模干扰电压＜1 kV,低于特高压变电站保护与控制设备的浪涌抗扰度4级的要求.
연구특고압변전참보호여공제설비적전자겸용문제대우학보특고압전망적가고은정운행구유중요의의.위차,장구량법여Fourier변환기술상결합,연구료뢰격특고압변전참시보호소실구역적순태전、자장분포,이급재쌍단접지이차전람상산생적병폐층전류화심선공모간우전압.예측계산표명:보호소실구역적최대순태자장강도약위2285 A/m,건의재보호소실장체포설금속병폐망이만족특고압변전참보호여공제설비적맥충자장항우도5급적요구;유우뇌전류작용시간겁단,재가상전람구내다근전람화병련동배적분류작용,불회도치이차전람적소훼;이차전람적심선공모간우전압＜1 kV,저우특고압변전참보호여공제설비적랑용항우도4급적요구.
Electromagnetic compatibility issue of the protection and control equipment in UHV substation is of great importance to ensure the reliable and stable UHV power grid.Combined the method of moment with the Fourier transform,the transient electromagnetic field at the relay cell zone,current flow in the cable shield and commonmode voltage in the cable core are investigated due to the lightning strike on the lightning rod in UHV substation.The simulation results show that:(1)the maximum transient magnetic field at the relay cell zone is about 2285 A/m and the metal shielding structure on the wall of the relay cell is necessary to satisfy the requirements of pulse magnetic field immunity for the secondary equipment in UHV substation;(2)the current in the cable shield will not lead the secondary cable burned due to the shunt of the multi-cable and auxiliary copper bar;(3)the common-mode voltage on the cable core is below 1kV and satisfies the requirements of surge immunity for the secondary equipment in UHV substation.