Inspect the transformer's exterior and ensure the sound is normal.
If a low-voltage fuse blows: inspect for faults in the low-voltage circuit; check if the fuse tripped due to a low setting or overloading; if it's safe and convenient, also use a fault indicator lamp to test the break in fuse FU2 to determine if there's a circuit fault: no light or red glow indicates the circuit may be normal; steady light suggests the circuit may be abnormal. When testing, disconnect the load and ensure the fault indicator lamp's resistance is not too high. If everything is normal, replace the fuse and try sending 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 attempt a trial power-on; if two phases or more blow, shut down the transformer, inspect and measure the insulation resistance, identify the cause of the fault before restoring power.
④When a fuse blows, accompanied by abnormal transformer sounds or oil leakage, the power circuit breaker of the transformer's upstream level should be opened to disconnect power and handle the issue.400 Hz Power Supply
