The Buchholz relay is normally used to protect the
- A. Alternators against all internal faults
- B. Oil immersed transformers against all internal faults
- C. Synchronous motors against all internal faults
- D. Transmission lines against all short circuit faults
Answer: B. Oil immersed transformers against all internal faults
Explanation: Buchholz relay is a gas-actuated protective device installed in the pipe connecting the tank and conservator of oil-immersed transformers to detect incipient and severe internal faults.