A distance relay is connected with the area of operation in the R-X plane that is common to

i. a Mho relay of radius 15 Ω and,

ii. an off-set Mho relay with center (5Ω, 7Ω) and radius 9 Ω.

a) Determine the length of the transmission line whose impedance angle is 750, that would be covered by the combined relay.

b) What is the resistance of a fault that can be detected, if it occurs at a point along the line that is

i. distant 9 Ω from the location of the relay

ii. distant 2 Ω from the location of the relay