Offset mho relay

1. What is offset mho relay?
2. What is mho relay used for?
3. Which one of the following is characteristic of an offset mho relay?

What is offset mho relay?

The impedance-based positive and negative offset mho relays are used for the fast detection of the LOE phenomenon in the system. The protection relays get maloperated when FACTS devices implemented in the system. The presence of FACTS controller changes the value of the total impedance.

What is mho relay used for?

Mho distance relays are widely used for the protection of uncompensated and series compensated transmission lines in order to determine the presence and location of faults.

Which one of the following is characteristic of an offset mho relay?

- Berdy or negative offset Mho relay characteristics: Negative Mho offset relay is a single-phase single element high speed distance relay. It is arranged to operate from the voltage between two phases, and the difference between the currents of the two phases, at the terminals of the generator to be protected.