Distribution automation FA refers to obtaining fault information in the event of a fault, and automatically identifying and isolating the fault section of the feeder to restore the power supply to the non-fault area, thereby reducing the power outage area and shortening the power outage time. Among them, the control of in-situ FA automation realizes in-situ fault isolation and fault information upload by using recloser and sectionalizer, recloser and recloser, and point-to-point communication.
Test site:Jiangxi Province XX Power Supply Company.
Test Equipment:Distribution Star-P2200A1 Distribution Automation Terminal Tester3 unitsWDS-3 Distribution Switch Simulation Test Box1 set, 1 diesel generator, 1 notebook, several walkie-talkies. (FTU uses an IoT card to communicate with the master).
Distribution Star-P2200A1 Distribution Automation Terminal Tester
The following figure shows the wiring diagram of the 10kV line at the test site for normal operation.
Terminal self-healing control strategy. ：The substation switch CB recloses twice, the line first-stage sectional switch FD1 closes after power-on delay for 20s, FS1 is the first-end sectional switch, FS2 FS6 LSW1 LSW2 is the adaptive comprehensive intelligent load sectional switch contact switch, and YS1 YS2 is the user demarcation switch (circuit breaker). The WDS-3 distribution switch simulation test box was placed on the CB switch to simulate its action, and three distribution star-P2200A1 distribution automation terminal testers were placed at FS1, FS2 and FS3 to simulate the fault current and voltage. 
The 10kV line is put into operation normally and has a wiring diagram.
The main interface of the Distribution Star-P2200A1 Distribution Automation Terminal Tester.
FA test module interface.
The FA test module interface can display the corresponding terminal status of each tester. The simulated faults in this test are the output state and switching state of the distribution tester corresponding to the FS1, FS2 and FS3 switches. According to the terminal state, the electrical analog quantities such as current, voltage, and switch position are set at the time of fault, and the fault type before and after the switch is judged in combination with the current direction, so as to find out the fault point and quickly isolate the fault without the need for cumbersome state sequence deduction.
In this test, the fault occurred between FS2 and FS3 on the trunk road as an example, and the in-situ FA automatic action process was analyzed
FS1 and FS2 detect the fault current and memorize it, while FS3 does not detect the fault current. First of all, the CB protection trips (trips the temporary access WDS-3 distribution switch simulation test box), and the FS1 FS6 loses power and opens the switch in a delayed manner. Switches CB and FS1-FS6 all jump open and are in the open position. CB (WDS-3 Distribution Switch Simulation Test Box) recloses for the first time after 2s. There is voltage on one side of FS1 and fault current memory, and the delay is 20s for closing. After FS1 is closed, there is voltage on one side of FS2 and fault current memory, and the delay is 7s to close. There is voltage but no fault current memory on one side of FS4, and the long-delay 57s closing is initiated. FS2 closes in fault, because it is a permanent fault, CB trips again, FS2 loses power and delays opening and locking. FS3 power loss switching, due to short-term power locking and closing, FS4 FS6 power loss delay switching. CB (WDS-2 Distribution Switch Simulation Test Box) is reclosed twice, FS1, FS4, FS5 and FS6 are closed with delay in turn, and LSW1 is automatically transferred (or manually closed). After all actions are completed, the fault is isolated between FS2 and FS3, and during the operation, three distribution automation terminal testers continue to output the FS1-FS3 fault state, and record the state change of the corresponding terminal switch position, and the master station receives the above action message and records the wave, and sends the 10kV line FA automatic action information report to determine the fault interval.