Correct option is C
The Mho relay is also known as the angle impedance relay. It is a high-speed relay that measures a component of admittance |Y| ∠ θ. When plotted on an impedance diagram, its characteristic is a circle that passes through the origin.
Here are some other characteristics of the Mho relay:
· It is a directional relay that detects faults only in the forward direction.
· Its operation is most affected by arc resistance.
· It is used for the protection of long-line transmission lines.
