5.10 A zone of a distance relay is set at 10 2 secondary. The CT ratio is 500: 5 and the VT ratio is 20 000: 69.3. What is the fault resistance that this relay tolerates for a fault at a distance of 80% of the zone boundary? Find the answers for a directional impedance relay and also for a mho relay. You may assume that the remote terminal of the line is out of service. The line impedance angle and the relay maximum torque angle are both equal to 80°.