Inspect the transformer's exterior and sound for normalcy.
② In case of fuse blowing for low-voltage circuit breakers: inspect for any faults in the low-voltage lines; check if the fuse has blown due to improper setting or overloading. If it is safe and convenient to do so, you can also use a fault indicator lamp to test the break point on fuse FU2 to determine if there are any line faults: if it doesn't light up or turns red, the line may be normal; if it lights up normally, the line may be abnormal. When testing, disconnect the load, and ensure the resistance inside the fault indicator lamp is not too high. If everything is normal, replace the fuse and try to send power once. Aviation Power
If a high-voltage fuse blows: If one phase blows, the transformer is normal, and there is no fault on the low-voltage side lines, replace the fuse and test once; if two phases or more blow, stop the transformer, inspect and measure the insulation resistance, identify the cause of the fault before restoring power.
④ In the event of a fuse blowing simultaneously with abnormal transformer sounds or oil leakage, the power circuit breaker of the transformer's upstream level should be opened to disconnect power and address the issue. 400HZ power supply
