Mitigation of Voltage Sag using Superconductor Fault Current Limiters

In the modern power system, as the utilization of electric power is very wide, and it is very easy for occurring any fault or disturbance, which causes a high short circuit current flows. More over the increase in the power generation results in an increase in the system fault current levels. The high current due to this fault large mechanical forces and these forces causes overheating of the equipment. If the large size equipment are used in power system then they need a large protection scheme from severe fault conditions. Generally, the maintainece of electrical power system reliability is more important. But the elimination of fault is not possible in power systems, so, the only alternate solution is to reduce the fault current levels. For this Super Conducting Fault Current Limiter is the best electric equipment which is used for reducing the severe fault current levels. In this paper, we simulated the unsymmetrical faults with superconducting fault current limiter. In our analysis we had the following conclusions. The L-L, L-G, L-L-G Fault Current was limited to possible minimum level when compared to the three phase faults like L-L-L and L-L-L-G