Abstract
Modern power systems are growing more complex due to increasing power demand along with the increase in the fault level of the system. The faulty condition is not tolerated in the power system. Fault current limiters (FCL) reduce the damage caused to the system considerably during fault. However, the operation of FCL may adversely affect the operation of relay. In this paper, the effect of FCL on relay protection is studied in its different operating modes. The protection distance of the line is found to be reduced under FCL operation. The solutions presented earlier for this problem require adjustment in relay settings and were found to be inaccurate for the FCL application to the transmission systems. This paper presents a novel solution to the problem of relay mal-operation which does not require any adjustment in relay setting. Rigorous simulations are performed in MATLAB/SIMULINK to test the effectiveness of the presented solution which is found to be 99.80% accurate. Also, the results show that FCL can be used as series compensator to improve power transfer of the transmission system during its normal operation. This eliminates the need to modify the relay settings for the compensated line. Thus, the dual function of improvement in power transfer and reduction in fault current is achieved.
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