교류 급전계통의 고장 시뮬레이션을 통한 고장특성 분석

초록

This paper analyzed characteristics of fault that occur in the AC feeding system to improve reliability of the protection system. PSCAD/EMTDC(power analysis program) was used for modeling AC feeding system. And it analyzed the operating characteristics of the up line and down line impedance relay along the various fault simulation. When fault occurs between substation and the second SSP, distinguishment of the fault location of the up line and down line was clear. But when it occurs between the second SSP and SP, distinguishment was difficult with the setting standard of the conventional impedance relay. So, in order to determine fault location of the up line and down line, improvement of protection systems that distinguish fault location through fault current direction of the impedance relay installed in the SP are required.