How Buchholz Relays Work

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This 3D animation shows how a Buchholz relay works. The 3D animation explains clearly each of the three main faults a transformer is likely to have and how the Buchholz relay triggers either an alarm and/or shutdown depending upon the severity of the fault.


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▶️Introduction
We discuss the Buchholz relay’s main components and how they protect the electrical transformer. Compared to gas actuated relays, a Buchholz relay has three functions, but a gas actuated relay has only two.

Buchholz relays are only fitted on liquid insulated electrical transformers and are designed to operate with the following electrical faults:

Fault 1
Large Electrical Fault
Fast and Large Amount of Gas Accumulation
Result: Transformer Alarms and Trips (shutdown)

Fault 2
Minor Electrical Fault
Slow Gas Accumulation
Result: Transformer Alarms

Fault 3
Low Insulating Liquid Level
Insulating Liquid Level Drops
Result: Transformer Alarms and Trips



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