The accuracy of single-end impedance based fault location for single-line-to-ground fault in transmission line is mainly affected by the unknown opposite-end system operation mode and fault resistance. In general, wind farm expresses a typical weak infeed system operation characteristic, but the equivalent characteristic of different type’s wind farm after fault is different, so there is a big fault location error, and the error generation mechanism is not clear. In response to this problem, this paper models and analyzes operation characteristics of three types’ wind farms:Squirrel Cage Induction Generator (SCIG), Permanent Magnetic Synchronous Generator (PMSG) and Doubly-Fed Induction Generator (DFIG), and then contrasts the phase difference values between voltage at fault point and negative and zero sequence currents at the two ends of line. After that, it quantifies the equivalent impedance variation patterns of different types’ wind turbines and different grid-connection capacities of wind farm, in following, analyzes the fault location precision and correlative factors both from the power system side and wind farm side. The suitable fault location schemes response to different types’ wind farms are clearly concluded in this paper based on believable cases simulations, and the further improvement direction is also pointed out. This work is supported by National Natural Science Foundation of China (No. 51477084), Beijing Natural Science Foundation (No. 3152016), and State Grid Jibei Electric Power Company Limited Project Funding (No. 20152000959).