CAJ | 학술논문

针对输电线路最常发生的单相接地故障,以最小二乘矩阵束算法为基础,提出了一种在线路末端故障时计算距离准确、在线路末端附近故障时计算距离具有正误差现象的频域距离保护算法。该保护算法的核心是假设故障点之后的零序回路为纯电感线路,列写出在频域具有3个未知变量的线性测距方程。电磁暂态仿真程序的仿真试验表明,在集中参数模型的短距离输电线路上,该保护算法在线路末端故障时测距准确,在线路末端附近经过渡电阻接地故障时不存在超越问题。
침대수전선로최상발생적단상접지고장,이최소이승구진속산법위기출,제출료일충재선로말단고장시계산거리준학、재선로말단부근고장시계산거리구유정오차현상적빈역거리보호산법。해보호산법적핵심시가설고장점지후적령서회로위순전감선로,렬사출재빈역구유3개미지변량적선성측거방정。전자잠태방진정서적방진시험표명,재집중삼수모형적단거리수전선로상,해보호산법재선로말단고장시측거준학,재선로말단부근경과도전조접지고장시불존재초월문제。
Based on least square matrix pencil algorithm,a novel distance protection algorithm in frequency domain for single-phase-to-earth fault of transmission line is proposed,which can accurately calculate the fault distance when faults happen at the remote terminal,and get a positive fault distance error when faults happen around the remote terminal.Assuming that the impedance of zero phase sequence loop after the fault point is pure inductive,a linear distance measure equation with three unknown coefficients is deduced.Simulation results with electromagnetic transient program(EMTP) show that for concentrate parameter model of short-distance transmission lines,this algorithm can measure distance accurately when faults happen at the remote terminal.It can effectively prevent the overreach phenomenon when faults happen around the remote terminal through transient resistance.