The different types of wind power connecting to grid system shows unique fault features which are different from traditional power supply. There exists an adaptability problem for the application of protection relays basing on traditional power supply. According to the fault characteristics of the types of wind farm, the operation performance of different fault and different operating conditions (the differential element, the directional element, the distance element and the phase-selection element) is simulated and analyzed. The analysis results show that, when the fault current of DFIG wind farm outgoing transmission appears, the wind power system, the frequency of that will deviate, shows poor feedback , which has vicious impact on the protective device based on frequency vector; However, the direct drive wind farm only has partial influence on the negative sequence, zero sequence direction element, the phase-selection element.