3상 전력계통의 1선 지락사고에 대한 초전도한류기의 동작특성

Operating properties of superconducting fault current limiters with a sing1e line-to-ground fault in a three-phase system

We performed unsymmetrical analysis of a single line-to-ground fault in a three-phase system. The current limiting elements were meander type YBCO stripes coated with Au shunt. When the fault occurred, short circuit currents were effectively limited within 1-2 msec after fault instant. The unsymmetrical rate of fault phase was distributed from 6.4 to 1.4 and most of the fault current flowed in the grounding line due to its direct grounding system.