A mho relay is used for the protection of:
A mho relay is used for the protection of:
Right Answer is:
Long Transmission Line
SOLUTION
MHO relay is a high-speed relay and is also known as an admittance relay. lt is well known that a long line is less stable than a short line; that is, a long line has a larger swing angle δmax compared to a short line. The short line has a higher Pmax than that of a long line.
Why is Mho’s Relay used for Long Transmission Line?
- Mho relay comes in the category of the distance relay protection scheme.
- The mho type relay is most suited for long lines because there are more chances of severe synchronizing power surges on the system.
- MHO Relay is less affected by the power swing.
- It does not need any additional equipment to prevent tripping during these surges.
- The mho relay occupies the least space on an R-X diagram for a given line section and is, therefore, least affected by abnormal system conditions except for the line faults.
- Since the mho relay is most affected by arc resistance, it is used for long lines.