Under the existing 3/2 connection mode, the configuration of the protection and transformer is not completely crossed which causes the existence of the dead zone. When the fault occurs in the dead zone, line protection and breaker failure protection are generally matched with each other to achieve the complete isolation of the fault. This approach will make the scope of the circuit breaker to expand, and even lead to unnecessary outage of the normal bus. So it seriously affects the safe and stable operation of the system. In view of the above problems, this paper analyzes the characteristics of the dead zone fault under different protective CT configuration modes, and provides a method for dead zone fault isolation and fast recovery of error cutting element. Thereby this paper introduces circuit breaker opening and closing state information to effectively identify dead zone fault and the breaker failure. At the same time, based on the information sharing in the station area, the circuit breaker can be quickly recovered by using the reclosing function of the circuit breaker, which can significantly improve the safe and stable operation level of the system.