CAJ | 학술논문

对云广特高压直流系统“12·15”极1紧急停运、极2再启动事故进行分析,指出极1高低端阀组换流变压器分接头挡位不一致,引起极1低端阀厅 F5避雷器对地电压升高并损坏避雷器,最终导致极1保护87 DCM和87 CSD正确动作。极1闭锁过程中在中性母线上形成过电压,该电压作用在接地极线路上并引起接地极线路闪络导致其接地极线路不平衡保护60EL动作,60EL保护正确动作出口,极2再启动成功。同时对其存在的风险进行深入剖析,最后提出有效的处理措施,以降低云广特高压直流输电系统停运的风险。
대운엄특고압직류계통“12·15”겁1긴급정운、겁2재계동사고진행분석,지출겁1고저단벌조환류변압기분접두당위불일치,인기겁1저단벌청 F5피뢰기대지전압승고병손배피뢰기,최종도치겁1보호87 DCM화87 CSD정학동작。겁1폐쇄과정중재중성모선상형성과전압,해전압작용재접지겁선로상병인기접지겁선로섬락도치기접지겁선로불평형보호60EL동작,60EL보호정학동작출구,겁2재계동성공。동시대기존재적풍험진행심입부석,최후제출유효적처리조시,이강저운엄특고압직류수전계통정운적풍험。
This paper analyzes the December 15,2012 accident of pole 1 emergency switch-off(ESOF)and pole 2 restarting in Yunnan-Guangdong ultra-high voltage direct current(UHVDC)transmission project.It is pointed out that the earth voltage increase and subsequent damage to the low-voltage valve hall F5 arrester caused by the difference of the tap changer positions between the high-voltage and low-voltage valve group transformers,result in the correct operation of 87DCM and 87CSD of pole 1 DC protections.The flashover of electrode lines caused by the neutral bus overvoltage during pole 1 blocking results in the correct operation of electrode lines unbalanced protection (60EL),and then pole 2 restarts successfully.The risk in the process is thoroughly analyzed,and some effective measures are proposed to reduce the blocking risk of Yunnan-Guangdong UHVDC transmission project.