What is Buchholz Relay? And what is the work in principle Buchholz Relay? || Tach Engineer || 2023

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Buchholz Relay is a gas detection device that is widely used in transformers for protection against faults and other issues that could lead to damage or safety hazards. The device is named after its inventor Max Buchholz and has been used in transformer protection systems since the early 1900s.

The basic principle behind Buchholz Relay is to detect the presence of gas or oil in the transformer tank, which could indicate a fault or problem. 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, they displace some of the oil, causing the float to drop. This tilt of the float causes the mercury switch to trip, triggering an alarm or shutting down the transformer.

The Buchholz Relay is 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. It is a low-maintenance and reliable device that provides an extra layer of safety and protection to transformers. Its ability to detect minor faults before they become major problems helps to prevent damage to the transformer and reduce the need for costly repairs.