Operating characteristics according to the application position of a superconducting fault current element integrated into a transformer

We analyzed operating characteristics to limit the peak value of initial fault current by inserting superconducting element into a neutral line. In order to detect the fault current, a current transformer (CT) was installed at the secondary winding and a SCR that changed current-flow by switching operation was installed. The fault current was reduced by inserting the superconducting element into a neutral line and was limited by connecting the normal conductivity element to the third winding. We confirmed that the peak value of initial fault current was reduced at lower level due to quench of the superconducting element connected to a neutral line, and the burden given to the superconducting element was significantly reduced as the normal conductivity element limited the fault current remarkably after switching operation.