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In a transformer, insulation breakdown look place due to which over-healing is occurring again and again. What is the name of the fault due to which the transformer is experiencing over-heating again and again?

In a transformer, insulation breakdown look place due to which over-healing is occurring again and again. What is the name of the fault due to which the transformer is experiencing over-heating again and again? Correct Answer Inter turn faults

Incipient faults:

  • Incipient faults are one among the internal faults of power transformers.
  • Incipient faults are not serious at the starting but they gradually develop into hazardous faults.
  • These faults leads to insulation deterioration.

 

The incipient faults in transformers are due to the following reasons:

  • Contamination of the insulating oil in the transformer.
  • Core bolt insulation failure.
  • Rust or other materials on the core.
  • Short circuits in the lamination.
  • Moisture content in the insulating oil.

Effects of incipient faults:

  • Incipient faults causes mechanical stresses to the transformers.
  • These stresses gradually affect the insulation system of the transformer.
  • So the protection schemes of transformers are very much essential in order to prevent the winding faults resulting from the insulation failure.
  • Generally, Buchholz relay is used for protecting transformer against incipient or internal faults.

 

Buchholz relay:

Buchholz relay is a gas actuated relay and it is used to protect the transformer against all internal faults

  • It is a gas actuated device
  • It is placed between the main tank and the conservator
  • It is used in the transformer having the rating higher than 500 kVA
  • It causes alarm for minor fault and tripping for a major fault

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