Buchholz Relay for Transformer – A Complete Guide for Engineers and Buyers in India

If you are in the electrical power sector, you already know the importance of protecting transformers from internal faults. One of the most reliable and widely used devices for this purpose is the Buchholz Relay for Transformer .

At Dhruti Sales, we supply premium-quality Buchholz Relays across India, ensuring your transformers stay protected and perform efficiently. In this blog, we’ll explore its working principle, types, applications, benefits, and why choosing the right supplier matters.

What is a Buchholz Relay?

A Buchholz Relay is a gas-actuated protection device used in oil-filled power transformers. It detects internal faults—such as insulation failure or core overheating—before they cause major damage. This early warning system helps in preventing costly breakdowns and ensures uninterrupted power supply.

Key Features:

• Installed in oil-filled transformers (above 500 kVA)

• Provides both alarm and trip functions

• Works automatically without manual monitoring

Working Principle of Buchholz Relay

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