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Protection of Transformer


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The power transformer is costly equipment and highly reliable pieces of equipment of the Sub-station. So, the protection of transformer is the most vital. Different types of faults may occur in the transformer, if the fault sustains for a long time, the transformer will damage. Therefore, it is required to trip the transformer from both ends i.e H.V & L.V side of the transformer as soon as possible when any fault occurs. The power transformer should also be protected from lightning surges, switching surges, arcing grounds etc. For protecting from the surges, lighting arrester are used at both end of the transformer.

The others different protections for the transformer are given below:

  1. Over current and Earth fault protection.
  2. Differential protection for transformer.
  3. Differential magnetic-balance protection.
  4. Restriction Earth fault (REF) protection.
  5. Buchholze Relay protection.
  6. Thermal protection ( i.e WTI & OTI protection ).
  7. Pressure released Device ( PRD ) protection.
  8. Fuse Protection.


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