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Which relay is a gas operated relay used for the protection of oil immersed transformer against the types of internal faults?

Which relay is a gas operated relay used for the protection of oil immersed transformer against the types of internal faults? Correct Answer Buchholz relay

Buchholz Relay:

  • Buchholz relay is a protection device that is normally used in large oil-filled transformers normally above 500 kVA.
  • It is a kind of oil and gas-activated relay.
  • It operates under the condition that the level of transformer oil falls that leading to movement of the baffle plate.

 

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  • Whenever a small fault happens within the electrical device, heat is generated by the fault current.
  • The generated heat causes the decomposition of electrical device oil and gas bubbles are generated.
  • These gas bubbles run in the upward direction and obtain collected within the Buchholz relay.
  • The collected gas relocates the oil in the Buchholz relay and therefore the displacement is similar to the amount of gas collected.
  • The dislocation of oil causes the higher float to shut the higher mercury switch to connect an alarm circuit hence, once a small fault happens, then the alarm will be activated.
  • The collected quantity of gas specifies the level of fault that occurred.
  • Different types of faults have different types of oil flow and thus a fault can be recognized easily, and proper action can be taken.

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