1 Answer
A **Buchholz relay** is used in **oil-immersed transformers**. It's a protective device that helps detect faults in the transformer, especially those that occur inside the tank, where the transformer oil is used to cool and insulate the transformer windings.
Here’s how it works:
- The Buchholz relay is installed in the pipe between the main tank and the conservator tank (the part of the transformer where the oil expands and contracts as the transformer operates).
- It detects **gas accumulation** or **oil movement** caused by faults like short circuits or insulation failure inside the transformer.
- **Gas accumulation**: When there's a fault inside the transformer, gases like hydrogen are released. The Buchholz relay detects these gases and triggers an alarm or shutdown.
- **Oil movement**: If there’s a sudden change in oil flow, the relay can also detect this, often indicating a fault like a major short circuit.
In short, the Buchholz relay helps prevent serious damage to the transformer by catching early signs of trouble and taking preventive action.
Here’s how it works:
- The Buchholz relay is installed in the pipe between the main tank and the conservator tank (the part of the transformer where the oil expands and contracts as the transformer operates).
- It detects **gas accumulation** or **oil movement** caused by faults like short circuits or insulation failure inside the transformer.
- **Gas accumulation**: When there's a fault inside the transformer, gases like hydrogen are released. The Buchholz relay detects these gases and triggers an alarm or shutdown.
- **Oil movement**: If there’s a sudden change in oil flow, the relay can also detect this, often indicating a fault like a major short circuit.
In short, the Buchholz relay helps prevent serious damage to the transformer by catching early signs of trouble and taking preventive action.