Which of the following relays is used on long transmission lines?
Correct answer: B. Mho's relay
- A. Impedance relay
- B. Mho's relay
- C. Reactance relay
- D. None of the above
Explanation
A mho relay is inherently directional and has a circular characteristic well suited to long, high-voltage transmission lines. Impedance and reactance relays are also used in protection, but the standard choice for long lines is the mho relay.
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