The feasibility of protection adopts traditional model identification method based on time-domain signal on DFIG based wind power outgoing lines is low because of the high harmonic and frequency deviation. Although the distance protection based on time-domain performs well when being applied on wind power outgoing lines, miss operations of distance zone I may occur under outgoing line single phase high resistance grounding faults. Aiming at the feasibility problem mentioned above, a principle of high resistance grounding time domain equation based distance protection is proposed. Based on time domain distance protection principle, by reconstructing the time domain equation and adding the identification of transition resistance, the defects caused by somewhat ignoring transient resistance is overcome. Simulation results show that, the proposed high resistance grounding time domain equation based distance protection can adapt to the outgoing line of wind farm accessed power system, and avoid the miss operations of distance zone I under outgoing line single phase high resistance grounding faults effectively. This work is supported by National Natural Science Foundation of China (No. 51467019).