Abstract: In order to ensure the power supply reliability, the 110 kV substation of the regional power supply company must be equipped with automatic bus transfer equipment. However, for those substations which are hand in hand ring meshing wiring, conventional automatic bus transfer equipment cannot meet requirements. In this paper, two sets of remote backup devices newly put into operation between A and B 110 kV substations in local power supply company are taken as examples, to analyze the principle and realization method of remote backup device function. The problem of conflict between layout design and action logic are presented. Based on this question, improvement methods of the layout design and the device logic are given. This paper has a good guiding function for the construction of similar remote backup device.