1. Winding failure

Faults in dry-type transformer windings include ground faults, short-circuit faults and broken joints. The main reason for this failure is poor quality insulation design during the design process, resulting in long-term exposure of certain materials to the air. However, these social issues occurring in the transformer were not discovered during routine inspections and maintenance management, which resulted in one winding being short-circuited or disconnected. If the transformer winding has some defects in the manufacturing process, such as burrs and leakage between copper turns, the turns of the transformer will not be a complete short circuit, but will increase the resistance from the winding and cause local overheating. In addition, if the load of a transformer is too large during use and management, the transformer will accumulate too much dust, causing the heat generated by it to not be dissipated in time, causing it to remain in a high-temperature working state. Long-term operation will also cause damage to the internal management of the transformer. Therefore, during use, it is necessary to regularly clean the dust from the internal filter to improve its heat dissipation performance. For some old equipment in the enterprise, cooling system equipment can also be added to improve its heat dissipation.

2. Switch failure

Switch failure is one of the common faults of transformers. Often, there are switches that undergo meltdowns, burn marks, and insulation failure. Many factors contribute to this failure. Figure 1 is due to the loosening of the transformer screws in the switch during use, resulting in poor insulation; 2 is due to the insulation of the transformer joint; Figure 3 is due to the use of a transformer that is corrosive due to external factors, or is exposed to the switch other materials, causing their application to fail. This requires the inspection staff to carefully inspect the joints that are more likely to cause insulation failure during the overhaul process, and promptly replace or repair the problems found in the study to avoid further development and expansion of defects.

3. Core failure

The failure is caused by damage to the insulated core transformer coils and core, which results in multi-point ground short circuit faults occurring in the core during operation. A short-circuit fault in a multi-point grounding system will cause local overheating of the magnetic core, resulting in fault tripping and serious student fire hazards.