(7) Accident records. Record the maximum fault current at the time of the accident and the average load for a period of time before the accident (usually Imin), so as to analyze the accident, establish the fault section, and provide a basis for load restoration when the power supply of the healthy section is restored.

(8) fixed value remote modification and calling fixed value. In order to start the process of accident recording and other processes in time when a fault occurs, the FTU must be set, and the set value should be able to adapt to the change of the distribution network operation mode. Make FTU able to receive the specified modified setting value from DAS control center, and enable DAS control center to call the current setting value of FTU at any time.

(9) Self-test and self-recovery functions. FTU should have a self-detection function, and timely alarm when the equipment itself fails; FTU should have a reliable self-recovery function, once it is disturbed and causes a crash, the system will resume normal operation through the monitoring timer (W bit system.

(10) Remote control lockout And manual operation function. When repairing lines or switches, the corresponding FTU should have the function of remote control and locking to ensure the safety of operation and avoid vicious accidents caused by misoperation. It should also be able to provide manual closing/tripping buttons, In case of failure of the channel, manual operation can be performed to avoid directly operating the switch on the lever.

(11) Long-distance communication function. FTU has long-distance communication function, and can communicate with various communication transmission equipment ( DCE) is connected, the important issue is the communication protocol of FTU, which is faced with an urgent need