1) 110kV side BZT: When the 110kV bus failure causes the bus voltage loss, the circuit breaker on the fault zone will cut off the working power supply, and how the bus side of the BZT bridge will operate and the equipment on the fault zone will automatically switch to no fault.2) BZT at 35kV side: when 35kV busbar failure causes busbar voltage loss, the circuit breaker in fault area will cut off the working power supply, and BZT will automatically switch the fault to the equipment on the line.3) Use of 10kV side and BZT: when bus voltage loss is caused by 10kV bus fault or bus use, the fault side circuit breaker will be disconnected, and the BZT will close the bus breaker and switch the fault side load to the non-fault side.