Inside the Buchholz Relay: How it Works and How it's Built || Tach engineer || 2023

Buchholz Relay is an essential component in transformer protection systems that is designed to detect and respond to faults and other issues in oil-filled transformers. It functions by detecting the buildup of gas in the oil of the transformer and responding appropriately when the gas production exceeds a certain limit.

The relay consists of two main components: the gas collecting chamber and the mercury switch. The gas collecting chamber is located at the bottom of the transformer tank and is filled with oil. When gas bubbles rise to the top of the chamber, the mercury switch tilts, triggering an alarm or shutting down the transformer to prevent further damage.

Buchholz Relay is highly effective in detecting a wide range of faults in transformers, including insulation failure, short circuits, overloading, and other issues that could lead to serious damage or safety hazards. Its reliable and accurate performance has made it a vital tool in electrical engineering, ensuring the safety and efficiency of power grids and other electrical systems.