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Buchholz relay is a protection relay used in oil immersed transformers. Under what conditions does Buchholz Relay will NOT operate?

Buchholz relay is a protection relay used in oil immersed transformers. Under what conditions does Buchholz Relay will NOT operate? Correct Answer  Level of transformer oil falls that leads to no movement of baffle plate

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 leads 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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