A Buchholz relay is installed on oil-filled transformers and reactors with an expansion tank, specifically in the pipeline connecting the main tank to the conservator tank, to detect internal faults like gas formation or oil surges, protecting the equipment from severe damage

 A Buchholz relay is installed on oil-filled transformers and reactors with an expansion tank, specifically in the pipeline connecting the main tank to the conservator tank, to detect internal faults like gas formation or oil surges, protecting the equipment from severe damage.

Key Details:

Type of Equipment: Primarily oil-cooled transformers (power and distribution) and reactors.

Location: In the pipe between the main tank and the conservator (oil expansion tank).

Function: Detects gas accumulation (from insulation breakdown) or rapid oil flow (from faults) by sensing the movement of insulating oil, triggering alarms or tripping the circuit breaker.