Causes Of Common Faults Of Dry-Type Transformers

Causes of common faults of dry-type transformers
The output voltage of dry-type transformers should be kept within a range. If a fault occurs, in addition to power supply reasons, the common fault causes are as follows:

1. Caused by short circuit between winding phases. This type of fault is often caused by overload or reduced insulation of dry-type transformers. When a short circuit fault occurs, the output voltage of the dry-type transformer will be abnormal, and sometimes there will be abnormal conditions such as overheating and noise.

2 Caused by incorrect position of the tap changer. The tap changer is used to adjust the current. If the position is incorrect and cannot match the specific power supply current, it will also cause the output voltage to be too high or too low.

 

3. Caused by unbalanced three-phase load. If the three phases of the secondary of the dry-type transformer are unbalanced, the three-phase voltage of the dry-type transformer will change and the output voltage will be abnormal. In severe cases, the DC voltage will rise by 1.732 times.

4. Phase loss on the high-voltage side. Phase loss on the high-voltage side will also cause serious imbalance in the output voltage on the low-voltage side, and even damage the low-voltage equipment. There are many reasons for high voltage phase loss, but generally it is caused by the burning of part of the wiring or the failure of the old superior power distribution line due to inadequate maintenance.

Most of the common problems of dry-type transformers are listed above, so the daily maintenance work must be done well in the later stage, and the fault problems can be identified and repaired in time to avoid affecting the entire power circuit and causing unnecessary trouble.