Why is there high-voltage electricity but no low-voltage electricity in the tower crane cab?

Solutions for high-voltage electricity but no low-voltage electricity in the tower crane cab:

1. Check whether the voltage at the low-voltage output terminal of the transformer is normal.

2. Check whether the transformer coil is short-circuited correctly.

3. Check whether the transformer coil is short-circuited correctly.

4. The three-phase high-voltage and low-voltage transformers are normal. One phase of the transformer is out of power. To determine whether it is normal, first determine whether the three-phase Lingke fuse is blown, and then identify whether the voltage at the low-voltage terminals of the transformer is Normally, after identifying whether the voltage on the upper and lower sides of the low-voltage switch is normal, call whether the high-voltage power supply is normal. Check in this order to find out the fault.