Discussion
Mho relay is usually employed for the protection of :
Answer: D
The mho relay is usually employed for long transmission lines.
The mho (admittance) relay is a distance relay whose operating characteristic is a circle through the origin on the impedance diagram. It is inherently directional and covers the smallest area of the R-X plane for a given reach, so it is the least affected by power swings, which are a serious problem on long, heavily loaded lines.
The usual textbook matching is: reactance relay for short lines, where arc resistance would upset other relays; impedance relay for medium lines; mho relay for long lines. Transformers are protected mainly by differential relays, not distance relays.
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