Short circuit fault repair

1. phenomenonTransformers may experience winding deformation, insulation damage, and even burnout after short-circuit impact.

2. reason：

   • There are defects in the winding design or manufacturing process, such as loose windings, uneven supports, and loose pads.
   • When a transformer is subjected to short-circuit current impact, its dynamic stability is insufficient.

3. Repair Method：

   • Return to factory for maintenanceFor severely damaged transformers, they need to be returned to the factory for a hanging cover inspection to assess the degree of winding deformation and replace the damaged windings if necessary.
   • Reinforcement treatmentReinforce the winding, such as increasing the number of support bars, using hard paper tube insulation structure, etc., to improve the winding's short-circuit resistance.
   • Improve designTo address design flaws, improve winding design, enhance the rationality of dynamic calculation methods for mechanical strength, and appropriately relax design safety margins.

Insulation performance degradation maintenance

1. phenomenonThe insulation resistance test value of the transformer is lower than the standard value, which may be accompanied by partial discharge or breakdown phenomenon.

2. reason：

   • The insulation material is aging or damp.
   • There are defects in the manufacturing process, such as low strength of the insulation structure.

3. Repair Method：

   • Drying treatmentDry the damp transformer to restore its insulation performance.
   • Replace the insulation materialReplace aging or damaged insulation materials to improve insulation strength.
   • Improve manufacturing processesImprove the insulation structure design and enhance the strength of the insulation structure in response to manufacturing process defects.

Abnormal sound repair

1. phenomenonDuring the operation of the transformer, abnormal sounds are emitted, such as an increased buzzing sound, discharge sounds or impact sounds.

2. reason：

   • Loose iron core or poor grounding.
   • Winding or lead discharge.
   • Tube fouling or corona discharge.

3. Repair Method：

   • Tighten the iron coreTighten the loose iron core to ensure good grounding.
   • Check the windings and leadsCheck for discharge in the windings and leads, and if necessary, perform insulation treatment or replace damaged components.
   • Clean the sleeveClean the contaminated casing and eliminate the phenomenon of corona discharge.

Temperature control fault repair

1. phenomenonThe temperature control system cannot work properly, such as not being able to power on, not displaying temperature, or having large temperature deviations.

2. reason：

   • Power or fuse malfunction.
   • Poor or damaged sensor connection.
   • There are interference sources in the temperature control system.

3. Repair Method：

   • Check the power supply and fusesEnsure that the power supply is normal and the fuse is not blown.
   • Check the sensor connectionCheck if the sensor connection is good and replace the sensor if necessary.
   • Eliminate interference sourcesShielding the temperature control system to eliminate the impact of interference sources on the temperature control system.

Other common fault repairs

1. Oil color change and oil leakage treatment：

   • Oil color darkensAfter absorbing moisture, the quality of the insulating oil decreases, and it is necessary to replace the insulating oil in a timely manner.
   • Oil leakage problemBased on the oil leakage situation, decide whether to continue operating and arrange maintenance, or immediately shut down and replenish oil.

2. Three phase voltage imbalance treatment：

   • reasonGrounding fault or unbalanced load.
   • Repair MethodUsing multiple grounding points to reduce zero line power loss; For areas with high single-phase loads, single-phase transformers can be used for power supply; Regularly measure and adjust the load to ensure load balance.