When charging the 220 kV busbar T area from other side substation through the transmission line, some type of busbar protection may mis-trip the operating busbar and lines because of the large differential relay’s backup function. In order to prevent this risk, solutions should be taken. The different logics of the majority of busbar protections are analyzed. Several solutions are proposed, such as setting the switch simulation device manually, shortening the operation time of the backup protections, and shortening the CT from the charging equipment to the busbar protection. Considering the differences between the transform T area and this transmission line T area, this paper proposes the method to reset the transformer backup protection setting values. The above solutions to primary and secondary problems are verified by a practical operation case.