We are aware of the fact that the transformer operates as a heart of an electrical system. As an important part of the power systems, transformers play an essential part in power delivery and integrity of the power system as a whole. Every transformer has a defined limit of operation beyond where the damage of transformer can take place. When subjected to adverse conditions, heavy damage can be placed on the system and the equipment, unbearable interruption of service to your clients as well. As the lead time for repair and replacement of the entire unit is time consuming, hence limiting the damage to faulted transformers is the primary objective of transformer protection. We have listed a glossary for terms used in the réparation de transformateur Surplec. Read on.

  1. Direct impact: repairing or replacing the unit in terms of money.
  2. Indirect impact: after the failure supply to the client, he got interrupted during the production which leads to loss, which then affects the nation’s economy.

Transformer failure

There are many environmental issues where the transformer unit gets damaged or the entire unit is deemed defunct. Also, the risk of the transformer failure is considered two dimensional—the severity of the failure and frequency of the failure. Most of the times, these failures take place because of the insulation failure. This category entails inappropriate or defective installation, short circuits, insulation deterioration, when opposed to exterior surges like line faults and lightning.

Classification of transformer failure

  1. Winding failures due to short
  2. Core faults
  3. Terminal failures
  4. On-load tap changer failures
  5. Abnormal operating conditions
  6. External faults

Besides these, there are some other causes of transformer failure which are as follows:

  • Overloading: when transformers are overloaded than the nameplate capacity.
  • Line surge: caused by voltage spikes, switching surges, line faults or flashovers and other abnormalities.
  • Loose connections: inappropriate mating of dissimilar metals, inappropriate torqueing of bolted connections etc.

  • Oil contamination: this leads to sludging, humidity in the oil, carbon tracking etc.
  • Manufacturing or design errors: unsupported or loose leads, poor brazing, loose blocking, improper core insulation, inferior short circuit strength, and foreign objects in the tank.
  • Inappropriate maintenance or operation: improper or inadequate maintenance and operation are the biggest causes of transformer failure. It entails disconnected or improperly set controls, dirt and oil accumulated, loss of coolant, and corrosion.