【摘要】 本文从原理上开发了一种能反应输电线路故障后所产生的正序变化量的新型方向元件。并按此原理编制了软件,仿真微机保护的动作情况,在PRIME-550机上进行了各种全相及非全相运行状态下发生故障的试验。试验结果表明,由本文所述原理构成的方向元件在各种状态下都能正确地判断故障方向,并具有原理简单、方向明确、动作快、灵敏度高等优点。更多还原

【Abstract】 To meet the various requirements of modern power system protection and development of relay technology, this paper presents a new directional relay based on positive sequence fault components of power frequency. A single unit of this directional relay is adequate for all types of faults.The performance of the relay and all possible faults that may arise in power system are simulated on a PRIME-550 computer. The results show that this directional relay is capable of making correct decision in all fault, conditions even in two-pole operation case. It has. advantages of high speed operation, definite directivity, perfect selectivity and superior sensitivity更多还原