The Buchholz relay is 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 relay for oil-immersed transformers (internal faults).