Electrical Engineering XYZ MCQs
Offset mho relay is used for the protection of equipment when:
- Loss of excitation of the generator
- Failure of prime mover of the generator
- Either of above
- None of above
Correct answer: 1. Loss of excitation of the generator
Explanation: During the course of loss of excitation of the generator the generator is no longer producing adequate voltage due to loss of excitation, which could lead to unstable operation or even a blackout in the power system. An offset mho relay can be used to detect such a condition and trip the generator offline to prevent damage or instability in the system.