What is a Buchholz relay?

Question

Accepted Answer

Buchholz relay is a protective device for oil-filled transformers and reactors.

Buchholz relay is used to detect and prevent incipient faults in oil-filled electrical equipment.
It operates based on the principle that gas is generated when a fault occurs in the transformer or reactor.
The gas accumulates in the relay and triggers an alarm or initiates a trip to isolate the equipment from the power source.
Commonly used in high voltage transformers and reactors to prevent catastrophic failures.
Named after Max Buchholz, who invented the relay in the early 20th century.