Lightning arresters buchholz relay together used for protection of ________

Buchholz Relay: It 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 a rating higher than 500 kVA
• It causes alarm for minor faults and tripping for a major fault
   

Lightning arrester:

Definition: Protection device that protects the circuit from the strokes of lightning is known as a lightning arrester.

• The lightning strokes are nothing but surges with high transient voltage, arcs of isolation, spark, and surge currents because of lightning, etc
• These devices are used to defend the power systems by forwarding the high voltage surges in the direction of the ground.
• These power systems and over headlines can also be protected by using ground wire or the earthing from the direct strikes of lightning.