The integration of renewable energy sources into power systems changes the transient and fault current characteristics of the conventional grid. The variation in the system response during grid disturbance like sudden load changes or fault would cause the failure of traditional protection and control. Since the operating condition of DFIG depends on the characteristics of the grid and its control, the short circuit current in the system becomes more complex. This paper analyzes the short circuit characteristics of DFIG and develops an analytical expression for the three phase fault current. Depending on the severity of the fault in terms of voltage drop, the fault current responses are developed with and without crow bar resistance. The power swings that originates in the system when the fault is cleared are also analyzed in the paper. The transient simulation studies are performed in PSCAD/EMTDC by integrating DFIG to WSCC system. Case studies are performed to analyze the impact of location of fault to the power swing and fault current contribution. © 2016 IEEE.