What is Buchholz Relay in Transformer ?Buchholz relay is a gas relay used in oil-immersed transformers to monitor the gas production inside the transformer, so as to detect possible faults inside the transformer.How Buchholz relays workThe Buchholz relay works on the basis of the gas produced when the transformer fails internally. When overheating or discharge failure occurs inside the transformer, gas is produced. These gases will rise and pass through the top of the tank into the oil storage t