Abstract: With the continuous construction and improvement of the power grid structure, the national economic development and social life have higher requirements for the power supply reliability of the power system. Local backup automatic switching can only switch the main and backup power supply of the station. For the adjacent stations of the single source supply loop and the double source series chain network, fast switching of the main and backup power supply cannot be achieved. Through the structural analysis of 110 kV power grid in Bayannur, the influence of relay protection performance on the power supply reliability of different operation modes, and the analysis of the disadvantages of the adopted local backup automatic switching, a fiber channel based remote backup automatic switching method is proposed for 110 kV single power triangular network. Combined with the main structural characteristics of 110 kV power grid in Bayannur and the requirements of the “four-point” of relay protection, reasonable operation mode is arranged. Suitable application and configuration suggestions for remote backup automatic switching are proposed for the guiding function.