摘要
针对一起线路区外故障工频变化量阻抗保护误动作事件,对保护误动作原因进行分析。经过现场检查,发现线路保护电压N600回路误串入开口三角电压回路,导致工频变化量阻抗保护误动。从工频变化量阻抗保护原理出发,针对线路区内、区外及反向故障三种不同情况,利用故障电位图分析电压回路接线错误对工频变化量阻抗保护的影响,并给出有效的预控措施。
The present work was focused on causal analysis of improper action of power frequency variation impedance protection encountered by an actual transmission line when there occurred an external fault.It was found by on-site inspection a mistaken connection of line protection voltage N600 circuit into open-delta voltage circuit which resulted in improper action of power frequency variation impedance protection.Then starting from the principle of power frequency variable impedance protection,the influence of voltage circuit′s incorrect wiring on the impedance protection was analyzed by using fault potential diagram from the perspectives of three different fault situations,i.e.,internal fault,external fault and reverse fault.Moreover,effective pre-control measures were put forward so as to prevent the recurrence of such accidents.
作者
邳浚哲
王乐
檀林青
齐肖彬
李卓阳
PI Junzhe;WANG Le;TAN Linqing;QI Xiaobin;LI Zhuoyang(State Grid Hebei Ultra High Voltage Company,Shijiazhuang 050071,China)
出处
《电工技术》
2024年第3期124-126,129,共4页
Electric Engineering
关键词
电压回路
工频变化量
接线错误
保护误动作
voltage circuit
power frequency variation
incorrect wiring
improper action of protection
